阅读说明：本技术 管输送装置及管道铺设坑道内的管的接合方法 (Pipe transfer device and method for joining pipes in pipe laying tunnel ) 是由 岸正藏 伊东一也 小丸维斗 石村公 下村正隆 藤本丰 东贤人 于 2020-03-19 设计创作，主要内容包括：使载置有第一管(11)的第一输送台车(12)和载置有第二管(14)的第二输送台车(15)前进,将第一管(11)的一端部(19)与管道(2)的最末尾的管(4)的另一端部(20)接合,将第一管(11)的另一端部(20)抬起,使第一输送台车(12)和第二输送台车(15)后退,将第一输送台车(12)从第一管(11)的下方向跟前侧抽出,将连结构件(28)拆下并将第一输送台车(12)与第二输送台车(15)分离,使第一输送台车(12)后退并将其拉入到载置在第二输送台车(15)上的第二管(14)的下方,使第二输送台车(15)与第一输送台车(12)一起前进,将第二输送台车(15)上的第二管(14)的一端部(19)与接合于最末尾的管(4)的第一管(11)的另一端部(20)接合。(Advancing a first conveyance carriage (12) on which a first pipe (11) is placed and a second conveyance carriage (15) on which a second pipe (14) is placed, engaging one end (19) of the first pipe (11) with the other end (20) of the rearmost pipe (4) of the pipeline (2), lifting the other end (20) of the first pipe (11), retreating the first conveyance carriage (12) and the second conveyance carriage (15), withdrawing the first conveyance carriage (12) from below to the near side of the first pipe (11), detaching a coupling member (28) and separating the first conveyance carriage (12) from the second conveyance carriage (15), retreating the first conveyance carriage (12) and pulling it into below the second pipe (14) placed on the second conveyance carriage (15), engaging the second conveyance carriage (15) with the first advancement carriage (12), engaging the second conveyance carriage (15) with the rearmost pipe (4) on the second conveyance carriage (15) Is engaged with the other end portion (20) of the first pipe (11).)

1. A method of joining pipes in a pipe laying tunnel, comprising placing a first pipe on a first carriage having a first carriage and a pipe transfer device of a second carriage capable of traveling on rails in the pipe laying tunnel, placing a second pipe on a second carriage connected to the first carriage via a connecting member, transferring the first pipe and the second pipe, and joining the first pipe and the second pipe in sequence to the last pipe of the pipe in the pipe laying tunnel,

a first transport carriage on which a first tube is placed and a second transport carriage on which a second tube is placed are advanced to join one end of the first tube to the other end of the last tube,

lifting the other end of the first pipe, retreating the first and second conveyance carriages, and drawing out the first conveyance carriage from below the first pipe to the near side of the first pipe,

the connecting member is detached and the first conveying trolley is separated from the second conveying trolley,

the first transport carriage is retracted and pulled in under the second pipe placed on the second transport carriage,

the second conveyance carriage is advanced together with the first conveyance carriage, and one end of the second pipe on the second conveyance carriage is joined to the other end of the first pipe joined to the last pipe.

2. The method of joining pipes within a pipelaying tunnel according to claim 1,

after one end of the second pipe on the second conveyance carriage is joined to the other end of the first pipe joined to the last pipe, the other end of the second pipe is lifted, the first conveyance carriage and the second conveyance carriage are retreated, and the first conveyance carriage and the second conveyance carriage are pulled out from below the second pipe to the near side of the second pipe.

3. The method of joining pipes within a pipe-laying excavation according to claim 1 or 2,

after the other end portion of the first pipe is lifted and the first conveyance carriage and the second conveyance carriage are retracted to draw out the first conveyance carriage from below the first pipe to the near side of the first pipe, the lower rail of the first pipe joined to the rearmost pipe is removed and placed on the first conveyance carriage,

the connecting member is detached and the first conveying trolley is separated from the second conveying trolley,

the first transport carriage is pulled into the lower part of the second pipe mounted on the second transport carriage together with the removed rail.

4. The method of joining pipes in a pipe-laying tunnel according to any one of claims 1 to 3,

the detached coupling member is moved into the second pipe.

5. The method of joining pipes in a pipe-laying tunnel according to any one of claims 1 to 4,

after the other end portion of the first pipe is lifted and the first conveyance carriage and the second conveyance carriage are retracted to draw out the first conveyance carriage from below the first pipe to the near side of the first pipe,

a support member is provided below the other end portion of the first pipe,

the other end of the first tube is lowered onto and supported by the support member.

6. The method of joining pipes in a pipe-laying tunnel according to any one of claims 1 to 5,

after the coupling member is detached and the first conveyance carriage is separated from the second conveyance carriage,

the first transport carriage is drawn below the second pipe in a state where the second pipe placed on the second transport carriage is lifted up by a lifting device disposed on the second transport carriage.

7. A method of joining pipes in a pipe laying tunnel, comprising placing a first pipe on a first carriage having a first carriage and a pipe transfer device of a second carriage capable of traveling on rails in the pipe laying tunnel, placing a second pipe on a second carriage connected to the first carriage via a connecting member, transferring the first pipe and the second pipe, and joining the first pipe and the second pipe in sequence to the last pipe of the pipe in the pipe laying tunnel,

a first transport carriage on which a first tube is placed and a second transport carriage on which a second tube is placed are advanced to join one end of the first tube to the other end of the last tube,

lifting the other end of the first pipe, retreating the first and second conveyance carriages, and drawing out the first conveyance carriage from below the first pipe to the near side of the first pipe,

the connecting member is detached and the first conveying trolley is separated from the second conveying trolley,

an auxiliary rail device is provided, the auxiliary rail device is branched from the rail at the near side of the first pipe and extends into the second pipe mounted on the second conveying trolley,

the first transport carriage is retreated from the near side of the first pipe, is moved to the second pipe from the rail while running on the auxiliary rail device,

the inclined part of the auxiliary rail device which is branched from the rail and protrudes forward from one end part of the second pipe is removed,

the second conveyance carriage is advanced to join one end of the second pipe on the second conveyance carriage to the other end of the first pipe joined to the last pipe.

8. The method of joining pipes in a pipe-laying tunnel according to any one of claims 1 to 7,

when the connecting member is detached and the first conveying trolley is separated from the second conveying trolley, one end part of the connecting member is separated from the first conveying trolley,

the other end of the connecting member is released from the connection with the second conveyance carriage by operating an operation portion provided on the connecting member, and the connecting member is detached from between the first conveyance carriage and the second conveyance carriage.

9. A pipe conveying device for conveying pipes is characterized in that,

the pipe conveying device is provided with a first conveying trolley for conveying a first pipe, a second conveying trolley for conveying a second pipe and a connecting device for connecting the first conveying trolley and the second conveying trolley,

the connecting device comprises a connecting member, one end part of the connecting member is freely assembled and disassembled with the first conveying trolley, the other end part of the connecting member is freely assembled and disassembled with the second conveying trolley,

an engaging member which is freely engaged with or disengaged from one of the first conveying carriage and the second conveying carriage is provided at an end of the connecting member,

the engaging member can be switched between an engaging state in which the engaging member is engaged with one of the conveying carriages and a disengaging state in which the engaging member is disengaged from the one of the conveying carriages,

the connecting member is provided with a switching device for switching the engaging member from an engaging state to a disengaging state,

the switching device has an operation portion for externally operating the switching device,

the operation portion is exposed to a space formed between a first pipe placed on the first transport carriage and a second pipe placed on the second transport carriage.

10. The tube transfer device according to claim 9,

the engagement member is switched to the disengaged state by being dropped from the engaged state.

11. The pipe transportation apparatus according to claim 9 or 10,

the one of the transport carriages is provided with a biasing member that biases the engaging member from the engaged state to the disengaged state.

12. The pipe transporting apparatus according to any one of claims 9 to 11,

the connecting member can be divided into a first connecting member and a second connecting member,

the first connecting member is detachably connected with the first conveying trolley,

the clamping component and the switching device are arranged on the second connecting component,

the engaging member can be switched between an engaged state in which the engaging member is engaged with the second conveyance carriage and a disengaged state in which the engaging member is disengaged from the second conveyance carriage.

Technical Field

The present invention relates to a pipe transfer device used when joining pipes together to form a pipeline in a pipeline-laying tunnel formed underground by a shield tunneling machine, for example, and a pipe joining method using the pipe transfer device.

Background

Conventionally, as shown in fig. 51 and 52, for example, there is a pipe conveyance device used when joining a first pipe 203 and a second pipe 204 to a last pipe 202 of a pipeline in a pipeline installation tunnel 201. The pipe transfer device 205 is configured to be capable of traveling on a rail 206 in the pipe-laying tunnel 201, and includes a first transfer carriage 207 that transfers the first pipe 203, a second transfer carriage 208 that transfers the second pipe 204, and a coupling rod 209 that couples the first transfer carriage 207 and the second transfer carriage 208. One end of the link 209 is detachably coupled to the first transport carriage 207 via a first link pin 211, and the other end of the link 209 is detachably coupled to the second transport carriage 208 via a second link pin 212.

Using such a tube transport device 205, the tubes are joined as follows.

First, as shown in fig. 52, in a state where the first tube 203 is placed on the first conveyance carriage 207 and the second tube 204 is placed on the second conveyance carriage 208, the tube conveyance device 205 is advanced and stopped on the near side of the rearmost tube 202.

Next, the first coupling pin 211 is removed to release the coupling between the coupling rod 209 and the first transport carriage 207, the second coupling pin 212 is removed to release the coupling between the coupling rod 209 and the second transport carriage 208, and the coupling rod 209 is removed to separate the first transport carriage 207 and the second transport carriage 208.

Thereafter, the first conveyance carriage 207 is advanced to join one end of the first tube 203 to the other end of the last tube 202.

Thereafter, as shown in fig. 53, the pillow member 214 is provided below the first pipe 203, the first pipe 203 is stored on the pillow member 214, and the first conveyance carriage 207 is retracted and drawn out to the near side of the first pipe 203 from below the first pipe 203.

The first conveyance carriage 207 thus drawn out is lifted up and collected into the second pipe 204 placed on the second conveyance carriage 208.

Thereafter, the second conveyance carriage 208 is advanced, and one end of the second tube 204 on the second conveyance carriage 208 is joined to the other end of the first tube 203 joined to the rearmost tube 202.

Further, the tube transfer device and the tube joining method described above refer to Japanese patent application laid-open No. 2001-280541.

Disclosure of Invention

Problems to be solved by the invention

However, in the above-described conventional form, as shown in fig. 53, after the first pipe 203 is joined to the rearmost pipe 202, the first conveyance carriage 207 drawn out from below the first pipe 203 to the near side of the first pipe 203 is lifted up and moved into the second pipe 204 on the second conveyance carriage 208, and therefore, when the first conveyance carriage 207 is large and heavy, there is a problem in that a large amount of labor and effort are required for the work of lifting up and moving the first conveyance carriage 207 into the second pipe 204 on the second conveyance carriage 208.

In the above-described conventional configuration, the connecting rod 209 is hidden under the first pipe 203 and the second pipe 204 in a state where the first pipe 203 is placed on the first conveyance carriage 207 and the second pipe 204 is placed on the second conveyance carriage 208. Since the space below the first pipe 203 and the space below the second pipe 204 are extremely narrow, when the first connecting pin 211 is removed and the connection between the connecting rod 209 and the first conveyance carriage 207 is released, the first pipe 203 becomes an obstacle, and the removal of the first connecting pin 211 is difficult. Alternatively, when the second connecting pin 212 is removed and the connection between the connecting rod 209 and the second conveyance carriage 208 is released, the second pipe 204 becomes an obstacle, and the removal of the second connecting pin 212 is difficult.

In this case, there is a problem that the work of detaching the coupling rod 209 and separating the first conveyance carriage 207 and the second conveyance carriage 208 requires labor and time.

The purpose of the present invention is to provide a pipe joining method in a pipe laying tunnel, which can save labor and time for lifting a first conveyance carriage and moving the first conveyance carriage to a second pipe on a second conveyance carriage.

The purpose of the present invention is to provide a pipe transfer device and a pipe joining method in a pipe laying tunnel, which can reduce the labor and time required for the work of removing a coupling member and separating a first transfer carriage from a second transfer carriage.

Means for solving the problems

The pipe joining method in a pipe laying tunnel according to the present invention is a pipe joining method including: the method comprises placing a first pipe on a first transport carriage having a pipe transport device for the first transport carriage and a second transport carriage that can freely travel on rails in a pipe-laying tunnel, placing a second pipe on a second transport carriage connected to the first transport carriage via a connecting member, transporting the first pipe and the second pipe, and sequentially joining the first pipe and the second pipe to the last pipe of the pipe in the pipe-laying tunnel,

a first transport carriage on which a first tube is placed and a second transport carriage on which a second tube is placed are advanced to join one end of the first tube to the other end of the last tube,

lifting the other end of the first pipe, retreating the first and second conveyance carriages, and drawing out the first conveyance carriage from below the first pipe to the near side of the first pipe,

the connecting member is detached and the first conveying trolley is separated from the second conveying trolley,

the first transport carriage is retracted and pulled in under the second pipe placed on the second transport carriage,

the second conveyance carriage is advanced together with the first conveyance carriage, and one end of the second pipe on the second conveyance carriage is joined to the other end of the first pipe joined to the last pipe.

According to the pipe joining method in the pipe-laying tunnel of the present invention, it is preferable that after one end portion of the second pipe on the second conveyance carriage is joined to the other end portion of the first pipe joined to the rearmost pipe, the other end portion of the second pipe is lifted up, the first conveyance carriage and the second conveyance carriage are retreated, and the first conveyance carriage and the second conveyance carriage are pulled out from below the second pipe to the near side of the second pipe.

In the pipe joining method in a pipe-laying tunnel according to the present invention, it is preferable that after the other end portion of the first pipe is lifted and the first conveyance carriage and the second conveyance carriage are retracted to draw out the first conveyance carriage from below the first pipe to the near side of the first pipe, the lower rail of the first pipe joined to the rearmost pipe is removed and placed on the first conveyance carriage,

the connecting member is detached and the first conveying trolley is separated from the second conveying trolley,

the first transport carriage is pulled into the lower part of the second pipe mounted on the second transport carriage together with the removed rail.

According to the pipe joining method in a pipe-laying tunnel of the present invention, it is preferable that the detached coupling member is moved into the second pipe.

In the pipe joining method in a pipe-laying tunnel according to the present invention, it is preferable that after the other end portion of the first pipe is lifted up and the first conveyance carriage and the second conveyance carriage are retracted to draw out the first conveyance carriage from below the first pipe to the near side of the first pipe,

a support member is provided below the other end portion of the first pipe,

the other end of the first tube is lowered onto and supported by the support member.

According to the pipe joining method in a pipe laying tunnel of the present invention, it is preferable that, after the coupling member is detached and the first conveyance carriage is separated from the second conveyance carriage,

the first transport carriage is drawn below the second pipe in a state where the second pipe placed on the second transport carriage is lifted up by a lifting device disposed on the second transport carriage.

The pipe joining method in a pipe laying tunnel according to the present invention is a pipe joining method including: the method comprises placing a first pipe on a first transport carriage having a pipe transport device for the first transport carriage and a second transport carriage that can freely travel on rails in a pipe-laying tunnel, placing a second pipe on a second transport carriage connected to the first transport carriage via a connecting member, transporting the first pipe and the second pipe, and sequentially joining the first pipe and the second pipe to the last pipe of the pipe in the pipe-laying tunnel,

a first transport carriage on which a first tube is placed and a second transport carriage on which a second tube is placed are advanced to join one end of the first tube to the other end of the last tube,

lifting the other end of the first pipe, retreating the first and second conveyance carriages, and drawing out the first conveyance carriage from below the first pipe to the near side of the first pipe,

the connecting member is detached and the first conveying trolley is separated from the second conveying trolley,

an auxiliary rail device is provided, the auxiliary rail device is branched from the rail at the near side of the first pipe and extends into the second pipe mounted on the second conveying trolley,

the first transport carriage is retreated from the near side of the first pipe, is moved to the second pipe from the rail while running on the auxiliary rail device,

the inclined part of the auxiliary rail device which is branched from the rail and protrudes forward from one end part of the second pipe is removed,

the second conveyance carriage is advanced to join one end of the second pipe on the second conveyance carriage to the other end of the first pipe joined to the last pipe.

According to the pipe joining method in a pipe-laying tunnel of the present invention, it is preferable that when the first conveyance carriage is separated from the second conveyance carriage by removing the coupling member, one end portion of the coupling member is detached from the first conveyance carriage,

the other end of the connecting member is released from the connection with the second conveyance carriage by operating an operation portion provided on the connecting member, and the connecting member is detached from between the first conveyance carriage and the second conveyance carriage.

The pipe conveying device of the invention is a pipe conveying device for conveying pipes, and is characterized in that,

the pipe conveying device is provided with a first conveying trolley for conveying a first pipe, a second conveying trolley for conveying a second pipe and a connecting device for connecting the first conveying trolley and the second conveying trolley,

the connecting device comprises a connecting member, one end part of the connecting member is freely assembled and disassembled with the first conveying trolley, the other end part of the connecting member is freely assembled and disassembled with the second conveying trolley,

an engaging member which is freely engaged with or disengaged from one of the first conveying carriage and the second conveying carriage is provided at an end of the connecting member,

the engaging member can be switched between an engaging state in which the engaging member is engaged with one of the conveying carriages and a disengaging state in which the engaging member is disengaged from the one of the conveying carriages,

the connecting member is provided with a switching device for switching the engaging member from an engaging state to a disengaging state,

the switching device has an operation portion for externally operating the switching device,

the operation portion is exposed to a space formed between a first pipe placed on the first transport carriage and a second pipe placed on the second transport carriage.

According to the pipe conveying apparatus of the present invention, it is preferable that the engagement member is switched to the disengaged state by dropping from the engaged state.

In the pipe conveying apparatus according to the present invention, it is preferable that one of the conveying carriages is provided with a biasing member that biases the engaging member from the engaged state to the disengaged state.

According to the pipe transporting apparatus of the present invention, it is preferable that the coupling member be dividable into the first coupling member and the second coupling member,

the first connecting member is detachably connected with the first conveying trolley,

the clamping component and the switching device are arranged on the second connecting component,

the engaging member can be switched between an engaged state in which the engaging member is engaged with the second conveyance carriage and a disengaged state in which the engaging member is disengaged from the second conveyance carriage.

Effects of the invention

As described above, according to the present invention, after the first pipe is joined to the rearmost pipe, the first transport carriage is drawn out to the near side of the first pipe, the first transport carriage is drawn in under the second pipe placed on the second transport carriage, the second transport carriage is advanced together with the first transport carriage, and the second pipe on the second transport carriage is joined to the first pipe joined to the rearmost pipe.

Further, by operating the switching device by operating the operation unit, the engagement member is switched from the engaged state to the disengaged state by the switching device, and the connection between the coupling member and one of the first and second conveyance carriages is released. In this case, since the operation portion can be operated so that the first pipe and the second pipe do not interfere with each other, even when the space below the first pipe placed on the first conveyance carriage is narrow or the space below the second pipe placed on the second conveyance carriage is narrow, the connection between the one conveyance carriage and the connecting member can be easily released by operating the operation portion. This reduces labor and time required for the operation of detaching the coupling member and separating the first conveyance carriage from the second conveyance carriage.

Drawings

Fig. 1 is a side view of a pipe conveyance device used for joining pipes according to a first embodiment of the present invention.

Fig. 2 is a partially cut-away plan view of the tube transfer device with the tube placed thereon.

Fig. 3 is a side view of the tube transfer device.

Fig. 4 is a plan view of the first conveyance carriage of the pipe conveyance device.

Fig. 5 is an X-X view of fig. 1.

Fig. 6 is an enlarged view of a part of fig. 5.

Fig. 7 is a sectional view of a coupling portion of the first transfer cart and the first coupling member of the pipe transfer apparatus.

Fig. 8 is a plan view of the second conveyance carriage of the pipe conveyance device.

Fig. 9 is a plan view of a coupling portion of the first coupling member and the second coupling member of the pipe transfer device.

Fig. 10 is a sectional view of a coupling portion of the first coupling member and the second coupling member of the pipe delivery apparatus.

Fig. 11 is a cross-sectional view of a coupling portion between the second conveyance carriage and the second coupling member of the pipe conveyance device and the switching device, showing a state in which the engagement pin is switched to the engagement position.

Fig. 12 is an X-X view of fig. 11.

Fig. 13 is a cross-sectional view of a coupling portion between the second conveyance carriage and the second coupling member of the pipe conveyance device and the switching device, showing a state in which the engagement pin is switched to the disengaged position.

Fig. 14 is an X-X view of fig. 13.

Fig. 15 is a cross-sectional view of a coupling portion between the second conveyance carriage and the second coupling member and the switching device of the pipe conveyance device, and shows a state in which the second conveyance carriage is separated from the second coupling member.

Fig. 16 is a perspective view of a lifting jig used in the pipe joining operation.

Fig. 17 is a sectional view of a lifting jig used in the pipe joining operation.

Fig. 18 is a front view of a lifting jig used in the pipe joining operation.

Fig. 19 is a view of the lifting jig used to lift the insertion opening of the pipe.

Fig. 20 is a diagram illustrating a joining method of the pipe.

Fig. 21 is a diagram illustrating a joining method of the pipe.

Fig. 22 is a diagram illustrating a joining method of the pipe.

Fig. 23 is a diagram illustrating a joining method of the pipe.

Fig. 24 is a diagram illustrating a joining method of the pipe.

Fig. 25 is a diagram illustrating a joining method of the pipe.

Fig. 26 is a diagram illustrating a joining method of the pipe.

Fig. 27 is a diagram illustrating a joining method of the pipe.

Fig. 28 is a diagram illustrating a joining method of the pipe.

Fig. 29 is a diagram illustrating a joining method of the pipe.

Fig. 30 is a view showing a joining method of the pipe.

Fig. 31 is a diagram illustrating a joining method of the pipe.

Fig. 32 is a side view of an auxiliary rail device used in the pipe joining operation according to the second embodiment of the present invention.

Fig. 33 is a plan view of the auxiliary rail device.

Fig. 34 is a front view of the auxiliary rail device.

Fig. 35 is an enlarged front view of the auxiliary rail device.

Fig. 36 is a diagram showing a joining method of pipes using the auxiliary rail device.

Fig. 37 is a diagram illustrating a joining method of the pipe.

Fig. 38 is a diagram illustrating a joining method of the pipe.

Fig. 39 is a diagram illustrating a joining method of the pipe.

Fig. 40 is a diagram illustrating a joining method of the pipe.

Fig. 41 is a diagram illustrating a joining method of the pipe.

Fig. 42 is a diagram illustrating a joining method of the pipe.

Fig. 43 is a diagram illustrating a joining method of the pipe.

Fig. 44 is a diagram illustrating a joining method of the pipe.

Fig. 45 is a view showing a joining method of the pipe.

Fig. 46 is a diagram illustrating a joining method of the pipe.

Fig. 47 is a diagram illustrating a joining method of the pipe.

Fig. 48 is a diagram illustrating a joining method of the pipe.

Fig. 49 is a diagram illustrating a joining method of the pipe.

Fig. 50 is a view showing a joining method of the pipe.

Fig. 51 is a schematic side view of a conventional tube transport apparatus.

Fig. 52 is a diagram showing a method of joining tubes using the tube transport apparatus.

Fig. 53 is a diagram illustrating a joining method of the pipe.

Fig. 54 is a diagram illustrating a joining method of the pipe.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(first embodiment)

In the first embodiment, as shown in fig. 1, 2, and 20, reference numeral 1 denotes a pipe-laying tunnel constructed underground by a shield tunneling machine, and primary lining is performed. A pipe 2 formed by joining a plurality of pipes and a pair of left and right rails 17 (an example of a rail) are laid in the pipe-laying tunnel 1. The two rails 17 are each formed by joining a plurality of divided rails 18.

Further, the pipe installation tunnel 1 includes a pipe transfer device 10 for transferring pipes and a bicycle 9 such as a battery car for running the pipe transfer device 10. As shown in fig. 1 to 3, the pipe transfer apparatus 10 includes a first transfer cart 12 that transfers a first pipe 11, a second transfer cart 15 that transfers a second pipe 14, and a coupling device 16 that couples the first transfer cart 12 and the second transfer cart 15.

The pipe constituting the duct 2, the last pipe 4 of the duct 2, the first pipe 11, and the second pipe 14 each have a socket 19 at one end and a socket 20 at the other end. The bicycle 9 is detachably connected to the second conveyance carriage 15.

As shown in fig. 3 and 4 to 7, the first conveyance carriage 12 is capable of traveling on a rail 17 in the pipe-laying tunnel 1, and includes a carriage body 23, a plurality of traveling wheels 24 provided on the carriage body 23, a plurality of carriage jacks 25 (an example of a lifting device) for lifting and lowering the first pipe 11 supported by the carriage body 23, and a temporary placement plate 26 for temporarily placing the detached divided rail 18.

The carriage main body 23 includes a pair of front and rear support frames 60 that support the first pipe 11, and a connection frame 61 that is connected between the two support frames 60. The running wheels 24 are rollable on the rails 17, the carriage jacks 25 are provided in the carriage body 23, and the temporary placement plates 26 are provided at both side ends of the carriage body 23.

As shown in fig. 1 to 3, 5, 6, and 8, the second transport cart 15 has the same structure as the first transport cart 12, and the second pipe 14 is supported by the cart main body 23. As shown in fig. 8 and 11 to 15, the carriage body 23 of the second conveyance carriage 15 has a connecting plate 27 at one end, and an engagement hole 31 penetrating in the vertical direction is formed in the connecting plate 27.

The coupling device 16 includes a coupling member 28, and one end of the coupling member 28 is detachably attached to the carriage main body 23 of the first transport carriage 12 and the other end is detachably attached to the carriage main body 23 of the second transport carriage 15. The coupling member 28 can be divided into a first coupling member 29 and a second coupling member 30.

As shown in fig. 3, 4, and 7, one end portion of the first linking member 29 is detachably linked to the carriage main body 23 of the first transport carriage 12 via a first linking pin 32, and as shown in fig. 9 and 10, the other end portion of the first linking member 29 is detachably linked to one end portion of the second linking member 30 via a plurality of relay linking pins 33.

As shown in fig. 11 to 15, the second coupling member 30 is a channel-shaped member whose lower surface is open, and has a support plate 39 on its other end upper surface. The support plate 39 is formed with a holding hole 40 penetrating the second coupling member 30 in the vertical direction.

The second coupling member 30 is provided with an engagement pin 36 (an example of an engagement member) that is freely engageable with and disengageable from the second conveyance carriage 15, and a switching device 37 that switches the engagement pin 36 from an engaged state to a disengaged state.

The engagement pin 36 is fitted into the holding hole 40 of the second coupling member 30, is freely engaged with and disengaged from the coupling plate 27 of the second conveyance carriage 15, and is switchable between an engagement position P1 where the engagement pin is pushed into the engagement hole 31 from below as shown in fig. 11 and 12 and is engaged with the coupling plate 27 of the second conveyance carriage 15 and a disengagement position P2 where the engagement pin 36 is dropped from the engagement position P1 to below the engagement hole 31 and is disengaged from the coupling plate 27 of the second conveyance carriage 15 as shown in fig. 13 and 14. The engaged state corresponds to a state in which the engagement pin 36 is switched to the engagement position P1, and the disengaged state corresponds to a state in which the engagement pin 36 is switched to the disengagement position P2.

The switching device 37 switches the engagement pin 36 from the engagement position P1 to the disengagement position P2, and includes a support plate 43, an interlocking lever 44, and an operating lever 45 (an example of an operating unit), the support plate 43 supporting the engagement pin 36 at the engagement position P1 from below, the interlocking lever 44 being slidable in the tube longitudinal direction a, and the operating lever 45 operating the switching device 37 from the outside.

The support plate 43 is supported by a support piece 47 inside the other end of the second coupling member 30 and is slidable in the tube length direction a. In addition, a linkage rod 44 is provided in the second linking member 30, an operating rod 45 is provided at one end of the linkage rod 44, and a support plate 43 is provided at the other end of the linkage rod 44.

Further, a receiving plate 56 is provided inside the other end of the second coupling member 30, and the receiving plate 56 receives the engaging pin 36 that has dropped from the engaging position P1 to the disengaging position P2 from below.

As shown in fig. 9, 10, 11, and 13, an elongated hole 48 that penetrates in the vertical direction and is long in the tube length direction a is formed in one end portion of the second coupling member 30. The operating lever 45 passes through the elongated hole 48 from the inside of the second coupling member 30, protrudes above the second coupling member 30, and is exposed to a space 57 formed between the first pipe 11 placed on the first transport carriage 12 and the second pipe 14 placed on the second transport carriage 15.

As shown in fig. 11, 13, and 15, a drop preventing member 50 is provided at the other end of the second coupling member 30. The falling prevention member 50 is a member for preventing the second coupling member 30 from falling due to its own weight (and the own weight of the engagement pin 36 and an urging force of a coil spring 54 described later) in a state where the engagement pin 36 is engaged with the coupling plate 27 of the second conveyance carriage 15, and is formed in an inverted L shape by a vertical plate 51 provided upright on the upper surface of the second coupling member 30 and a horizontal plate 52 provided on the upper end of the vertical plate 51.

As shown in fig. 11, when the other end portion of the second coupling member 30 is coupled to the second conveyance carriage 15, the coupling plate 27 of the second conveyance carriage 15 is sandwiched between the support plate 39 of the second coupling member 30 and the lateral plate 52 of the drop preventing member 50, and the lateral plate 52 engages with the coupling plate 27 from above.

Further, when the other end portion of the second linking member 30 is linked to the second conveyance carriage 15, the cross plate 52 is engaged with the linking plate 27 from above, whereby the other end portion of the second linking member 30 can be temporarily (temporarily) stored in the linking plate 27. Therefore, even in the connecting operation between the other end of the second connecting member 30 and the second conveyance carriage 15, the second connecting member 30 can be prevented from dropping due to its own weight, and the connecting operation can be easily performed.

Further, the coupling plate 27 of the second carriage 15 is provided with a coil spring 54 (an example of an urging member) that urges the engagement pin 36 from the engagement position P1 toward the disengagement position P2. The coil spring 54 is housed in a box-shaped housing member 55 provided on the upper surface of the coupling plate 27. Further, a pull-up female screw portion 38 is formed at the top of the engagement pin 36, and the pull-up female screw portion 38 is provided at the engagement position P1 to pull up the engagement pin 36 switched to the disengagement position P2.

According to the switching device 37 as described above, as shown in fig. 11 and 12, when the engagement pin 36 is switched to the engagement position P1, the engagement pin is pushed into the engagement hole 31 while being supported by the support plate 43, and engages with the connecting plate 27. Thereby, the second connecting member 30 and the second conveying carriage 15 are connected via the engaging pin 36 and the connecting plate 27. At this time, the coil spring 54 is compressed, and the operating lever 45 is switched to the coupling position P3.

Thereafter, as shown in fig. 13 and 14, by switching the operating lever 45 from the coupling position P3 to the release position P4, the interlocking lever 44 slides in the tube length direction a in conjunction with the operating lever 45, and the support plate 43 retreats forward from below the engaging pin 36. Thereby, the engagement pin 36 falls, is switched from the engagement position P1 to the disengagement position P2, and is received by the receiving plate 56. Therefore, the engagement pin 36 falls below the engagement hole 31 and is disengaged from the connecting plate 27, and as shown in fig. 15, the connection between the second connecting member 30 and the second conveyance carriage 15 is released.

At this time, the engagement pin 36 is biased from the engagement position P1 toward the disengagement position P2 by the coil spring 54, and therefore can be reliably switched to the disengagement position P2.

As shown in fig. 16 to 18, reference numeral 80 denotes a raising jig for raising the pipe in the pipe laying tunnel 1. The lifting jig 80 includes a jig frame 81, a clamping mechanism 82, and a hydraulic jack 83, and the clamping mechanism 82 clamps the open end of the socket 20 of the first pipe 11 in the pipe diameter direction B.

The jig frame 81 includes a back plate portion 86, and inner and outer plate portions 87 and 88 provided at both ends of the back plate portion 86. The back plate portion 86 is provided with a handle 89.

The clamping mechanism 82 includes a pair of fixed plates 91 and movable plates 92 facing each other in the pipe diameter direction B, and a moving member 93 for moving the movable plates 92 relative to the fixed plates 91. The fixing plate 91 is fixed to the back plate portion 86. The jack 83 has a ram 84 which is attached to the fixing plate 91 and passes through the outer plate 88.

The moving member 93 has a bolt body 94 having an external thread on the outer periphery thereof and an engagement piece 95 provided at the tip of the bolt body 94. A screw hole 90 having a female screw is formed in the inner plate 87. The bolt body 94 of the moving member 93 is rotatably inserted through the screw hole 90 in a state where the male thread is screwed into the female thread. The movable plate 92 has an engaging body 96 on the upper surface. The engaging piece 95 has a larger diameter than the bolt body 94, and the engaging piece 95 engages with the engaging body 96.

According to the lifting jig 80 as described above, as shown by the imaginary line in fig. 18, the opening end portion of the socket 20 is interposed between the fixed plate 91 and the movable plate 92, and the movable member 93 is rotated in one direction to bring the movable plate 92 close to the fixed plate 91. Thereby, the distance C between the fixed plate 91 and the movable plate 92 in the pipe diameter direction B is shortened, the opening end portion of the socket 20 is sandwiched between the fixed plate 91 and the movable plate 92, and the lifting jig 80 is attached to the opening end portion of the socket 20.

As shown in fig. 19, the socket 20 of the first pipe 11 is lifted by attaching the two lifting jigs 80 to the lower portion of the opening end portion of the socket 20 and extending the pressure head 84 of the jack 83 of the two lifting jigs 80 so that the tip of the pressure head 84 presses the inner wall surface 5 of the pipe laying tunnel 1.

Further, by rotating the moving member 93 in the reverse direction to separate the movable plate 92 from the fixed plate 91, the gap C between the fixed plate 91 and the movable plate 92 in the pipe diameter direction B can be enlarged, and the lifting jig 80 can be detached from the opening end portion of the socket 20.

Further, as described above, the socket 20 of the second pipe 14 or the socket 19 may be lifted by using the lifting jig 80.

A joining method of joining the pipes in the pipe-laying tunnel 1 using the pipe transfer device 10 and the raising jig 80 will be described below.

As shown in fig. 20, the first pipe 11 is placed on the carriage body 23 of the first conveyance carriage 12 of the pipe conveyance device 10, the second pipe 14 is placed on the carriage body 23 of the second conveyance carriage 15, the bicycle 9 is advanced to push the pipe conveyance device 10 forward, the first conveyance carriage 12 and the second conveyance carriage 15 are advanced to convey the first pipe 11 and the second pipe 14, and the spigot 19 (one end) of the first pipe 11 is inserted into and joined to the spigot 20 (the other end) of the rearmost pipe 4 of the pipe 2.

At this time, the coupling member 28 is hidden under the first pipe 11 and the second pipe 14. Further, the vertical position of the first pipe 11 is adjusted by the carriage jack 25 of the first conveyance carriage 12, whereby centering at the time of joining can be performed.

Next, as shown in fig. 19, 21, and 22, two raising jigs 80 are attached to the lower portion of the opening end portion of the socket 20 of the first pipe 11, and the ram 84 of the jack 83 of the two raising jigs 80 is extended to raise the socket 20 (the other end portion) of the first pipe 11. Thereby, the first pipe 11 floats upward above the first conveyance carriage 12.

Next, as shown in fig. 23, the bicycle 9 is moved backward, the pipe conveyor 10 is moved backward, and the first conveyance carriage 12 is pulled out from below the first pipe 11 to the front side of the first pipe 11.

Next, as shown by the imaginary line in fig. 6 and fig. 24, the split rail 18 of the rail 17 below the first pipe 11 is removed and placed on the temporary placement plate 26 of the first conveyance carriage 12.

Next, as shown in fig. 25, a support member 63 such as H-shaped steel is provided below the spigot-side end of the first pipe 11, and the ram 84 of the jack 83 of the lifting jig 80 is shortened to lower the spigot-side end (the other end) of the first pipe 11 onto the support member 63 and support it by the support member 63. Thereafter, the two raising jigs 80 are detached from the open end of the socket 20 of the first pipe 11, moved into the second pipe 14, and temporarily stored. Since the socket-side end of the first pipe 11 is supported by the support member 63 as described above, the socket-side end of the first pipe 11 can be prevented from being displaced downward.

Next, as shown in fig. 26, the coupling member 28 is removed, and the first conveyance carriage 12 is separated from the second conveyance carriage 15. That is, as shown by the imaginary line in fig. 7, the first coupling pin 32 is removed to release the coupling between the first coupling member 29 and the first transport carriage 12, and as shown by the imaginary line in fig. 10, the relay coupling pin 33 is removed to release the coupling between the first coupling member 29 and the second coupling member 30, so that the first coupling member 29 is separated from between the first transport carriage 12 and the second coupling member 30. Thus, the first connecting pin 32 can be removed so that the first pipe 11 does not interfere with the first connecting member 29 and the first conveying carriage 12.

Thereafter, as shown in fig. 13 and 14, the operating lever 45 is operated to switch from the coupling position P3 to the release position P4. Thus, the engagement pin 36 is switched from the engagement position P1 to the disengagement position P2, the second coupling member 30 and the second conveyance carriage 15 can be released from each other by remote operation, the second coupling member 30 is disengaged from the second conveyance carriage 15, the coupling member 28 is detached from between the first conveyance carriage 12 and the second conveyance carriage 15, and the first conveyance carriage 12 and the second conveyance carriage 15 are separated from each other, as shown in fig. 15.

As shown in fig. 13, since such an operation of the operating lever 45 can be performed in a portion away from the engaging pin 36, that is, in a vacant space in front of the socket 19 of the second pipe 14, the engaging pin 36 can be switched from the engaging position P1 to the disengaging position P2 by remote operation. Therefore, when the engagement pin 36 is switched from the engagement position P1 to the disengagement position P2, the second tube 14 on the second conveyance carriage 15 does not interfere with the switching.

Therefore, even when the space below the second pipe 14 placed on the second transport carriage 15 is narrow, the other end portion of the coupling member 28 and the second transport carriage 15 can be easily decoupled by operating the operating lever 45. This can reduce the labor and time required for the operation of detaching the coupling member 28 and separating the first conveyance carriage 12 from the second conveyance carriage 15.

As shown in fig. 26, the first coupling member 29 and the second coupling member 30 detached as described above are moved and temporarily stored in the second pipe 14. Then, the second pipe 14 placed on the second transport carriage 15 is lifted by the carriage jack 25.

Thereafter, as shown in fig. 27, the first conveyance carriage 12 is pushed and retreated, and is pulled in below the second pipe 14 on the second conveyance carriage 15. Thereby, the first conveyance cart 12 is pulled into the lower side of the second pipe 14 together with the split rail 18 removed and placed on the temporary placement plate 26.

Further, as described above, the second pipe 14 on the second transport carriage 15 is lifted by the carriage jack 25, and the space below the second pipe 14 is expanded upward, so that the space 65 in which the first transport carriage 12 can be pulled into the lower portion of the second pipe 14 can be secured below the second pipe 14.

Thereafter, as shown in fig. 28, the bicycle 9 is advanced, the second conveyance carriage 15 is advanced together with the first conveyance carriage 12, and as shown in fig. 29, the spigot 19 of the second tube 14 on the second conveyance carriage 15 is engaged with the spigot 20 of the first tube 11 engaged with the rearmost tube 4.

At this time, the vertical position of the second pipe 14 is adjusted by the carriage jack 25 of the second conveyance carriage 15, whereby centering at the time of joining can be performed.

Thereafter, as shown in fig. 30, two raising jigs 80 are attached to the lower portion of the opening end portion of the socket 20 of the second pipe 14, and the socket 20 (the other end portion) of the second pipe 14 is raised by the raising jigs 80. Thereby, the second pipe 14 floats upward above the second conveyance carriage 15.

Then, as shown in fig. 31, the bicycle 9 and the first and second conveying carriages 12 and 15 are moved backward, and the first and second conveying carriages 12 and 15 are pulled out from below the second pipe 14 to the near side of the second pipe 14. Thus, the first pipe 11 and the second pipe 14 are joined to the last pipe 4 of the pipeline 2, and the pipeline 2 in the pipeline installation tunnel 1 is extended by repeating the joining step.

According to the pipe joining method described above, it is not necessary to lift the empty first conveyance carriage 12 and move it into the second pipe 14 on the second conveyance carriage 15, and it is possible to save labor and time required for such work.

In addition, the following operations can be repeated: the first conveyance carriage 12 and the second conveyance carriage 15 that have become empty are collected, and other tubes are conveyed by the first conveyance carriage 12 and the second conveyance carriage 15 and sequentially joined to the last tube.

Further, when the operating lever 45 is switched from the coupling position P3 (see fig. 11) to the release position P4 (see fig. 13), the engagement pin 36 is dropped from the engagement position P1 (see fig. 11 and 12), and the engagement pin 36 is switched to the release position P2 (see fig. 13 and 14), so that the engagement pin 36 can be switched from the engagement position P1 to the release position P2 without using a special driving device such as a motor or a hydraulic cylinder, and the amount of power consumption and the like can be reduced.

Further, since the engagement pin 36 is biased from the engagement position P1 toward the disengagement position P2 by the coil spring 54, it can be reliably switched to the disengagement position P2.

As shown by the imaginary line in fig. 6 and fig. 24, the detached divided rails 18 can be easily collected together with the first conveyance carriage 12 by placing the detached divided rails 18 on the temporary placement plate 26 of the first conveyance carriage 12.

In addition, after the second pipe 14 is joined to the first pipe 11, the first coupling member 29 and the second coupling member 30 can be easily recovered from the inside of the second pipe 14.

(second embodiment)

Hereinafter, a second embodiment will be described. Note that the same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the second embodiment, the first pipe 11 and the second pipe 14 are sequentially joined to the last pipe 4 of the pipeline 2 in the pipe-laying tunnel 1 using the pipe transfer device 10, the lifting jig 80, and the auxiliary rail device 101 (an example of an auxiliary rail device).

As shown in fig. 32 to 35, the auxiliary rail device 101 includes a plurality of auxiliary sleepers 102 and a pair of left and right auxiliary rails 103 supported by the auxiliary sleepers 102. The auxiliary rail 103 includes an inclined rail portion 104 (an example of an inclined portion) inclined obliquely upward from the front end portion to the rear, and a horizontal rail portion 105 extending rearward from the rear end portion of the inclined rail portion 104. The inclined rail portion 104 and the end portion of the horizontal rail portion 105 are detachably coupled to each other via a bolt, a nut, or the like.

The bicycle 9 is provided with a wire 107 having a hook at a front end thereof and a winch 108 for winding the wire 107. Further, the rails 17 in the pipe-laying tunnel 1 are supported on a plurality of sleepers 8.

A method of joining pipes in the pipe-laying tunnel 1 by using the pipe transfer device 10, the lifting jig 80, and the auxiliary rail device 101 will be described below.

As shown in fig. 36, the first pipe 11 is placed on the carriage body 23 of the first conveyance carriage 12 of the pipe conveyance device 10, the second pipe 14 is placed on the carriage body 23 of the second conveyance carriage 15, the bicycle 9 is advanced to push the pipe conveyance device 10 forward, the first conveyance carriage 12 and the second conveyance carriage 15 are advanced to convey the first pipe 11 and the second pipe 14, and the spigot 19 (one end) of the first pipe 11 is inserted into and joined to the spigot 20 (the other end) of the rearmost pipe 4 of the pipe 2.

At this time, the coupling member 28 is hidden under the first pipe 11 and the second pipe 14. Further, the vertical position of the first pipe 11 is adjusted by the carriage jack 25 of the first conveyance carriage 12, whereby centering at the time of joining can be performed.

Next, as shown in fig. 19, 37, and 38, two raising jigs 80 are attached to the lower portion of the opening end portion of the socket 20 of the first pipe 11, and the ram 84 of the jack 83 of the two raising jigs 80 is extended to raise the socket 20 (the other end portion) of the first pipe 11. Thereby, the first pipe 11 floats upward above the first conveyance carriage 12.

Next, as shown in fig. 39, the bicycle 9 is moved backward, the pipe conveying device 10 is moved backward, and the first conveying carriage 12 is pulled out from below the first pipe 11 to the near side of the first pipe 11.

Next, as shown in fig. 40, the coupling member 28 is detached and the first coupling member 29 and the second coupling member 30 are separated. That is, as shown by the imaginary line in fig. 7, the first coupling pin 32 is removed to release the coupling of the first coupling member 29 and the first transport carriage 12, and as shown by the imaginary line in fig. 10, the relay coupling pin 33 is removed to release the coupling of the first coupling member 29 and the second coupling member 30, and the first coupling member 29 is detached from between the first transport carriage 12 and the second coupling member 30. Thus, the first connecting pin 32 can be removed so that the first pipe 11 does not interfere with the first connecting member 29 and the first conveying carriage 12.

Thereafter, as shown in fig. 13 and 14, the operating lever 45 is operated to switch from the coupling position P3 to the release position P4. Thus, the engagement pin 36 is switched from the engagement position P1 to the disengagement position P2, the second coupling member 30 and the second conveyance carriage 15 can be released from each other by remote operation, the second coupling member 30 is disengaged from the second conveyance carriage 15, the coupling member 28 is detached from between the first conveyance carriage 12 and the second conveyance carriage 15, and the first conveyance carriage 12 and the second conveyance carriage 15 are separated from each other.

As shown in fig. 13, since such an operation of the operating lever 45 can be performed in a portion away from the engaging pin 36, that is, in a vacant space in front of the socket 19 of the second pipe 14, the engaging pin 36 can be switched from the engaging position P1 to the disengaging position P2 by remote operation. Therefore, when the engagement pin 36 is switched from the engagement position P1 to the disengagement position P2, the second tube 14 on the second conveyance carriage 15 does not interfere with the switching.

Therefore, even when the space below the second pipe 14 placed on the second transport carriage 15 is narrow, the other end portion of the coupling member 28 and the second transport carriage 15 can be easily decoupled by operating the operating lever 45. This can reduce the labor and time required for the operation of detaching the coupling member 28 and separating the first conveyance carriage 12 from the second conveyance carriage 15.

As shown in fig. 40, the first coupling member 29 and the second coupling member 30 detached as described above are moved and temporarily stored in the first pipe 11.

Thereafter, as shown in fig. 32 to 34 and 41, the auxiliary rail device 101 is set in the second pipe 14 on the second conveyance carriage 15. At this time, the horizontal rail portion 105 is provided in the second pipe 14, and the inclined rail portion 104 is attached to the front end portion of the horizontal rail portion 105 so as to project forward from the socket 19 of the second pipe 14. Thus, the auxiliary rail device 101 is provided so as to branch upward from the rail 17 on the near side of the first pipe 11 and extend into the second pipe 14.

Thereafter, as shown in fig. 42, the hook portion of the wire rope 107 provided in the bicycle 9 is hooked on the first conveyance carriage 12 that is empty, and the winch 108 is operated to wind up the wire rope 107. As a result, the first conveyance cart 12 is pulled by the wire rope 107, retreats from the near side of the first pipe 11, is transferred from the rail 17 to the auxiliary rail device 101, passes over the inclined rail portion 104, travels over the horizontal rail portion 105 as shown in fig. 32, 33, and 35, is transferred into the second pipe 14, and is stored in the second pipe 14 in a state of being supported by the horizontal rail portion 105 as shown in fig. 43.

Next, as shown in fig. 44, the divided rails 18 of the rails 17 below the first pipe 11 are removed and the temporary placement plate 26 of the first conveyance cart 12 placed in the second pipe 14 is placed. Then, the first connecting member 29 and the second connecting member 30 are moved from the first pipe 11 to the first conveyance carriage 12 in the second pipe 14.

Next, as shown in fig. 45, a support member 63 such as H-shaped steel is provided below the spigot-side end of the first pipe 11, and the ram 84 of the jack 83 of the lifting jig 80 is shortened to lower the spigot-side end (the other end) of the first pipe 11 onto the support member 63 and support it by the support member 63. Thereafter, the two raising jigs 80 are detached from the open end of the socket 20 of the first pipe 11, moved into the second pipe 14, and temporarily stored. Since the socket-side end of the first pipe 11 is supported by the support member 63 as described above, the socket-side end of the first pipe 11 can be prevented from being displaced downward.

Further, the inclined rail portion 104 of the auxiliary rail device 101 is detached from the horizontal rail portion 105 and temporarily stored in the second pipe 14. The inclined rail portion 104 corresponds to an inclined portion of the auxiliary rail device 101 that branches off from the rail 17 and projects forward from the socket 19 of the second pipe 14.

Thereafter, as shown in fig. 46, the bicycle 9 is advanced and the second transporting carriage 15 is advanced, and the spigot 19 of the second pipe 14 on the second transporting carriage 15 is engaged with the spigot 20 of the first pipe 11 engaged with the rearmost pipe 4.

At this time, the vertical position of the second pipe 14 is adjusted by the carriage jack 25 of the second conveyance carriage 15, whereby centering at the time of joining can be performed.

Thereafter, as shown in fig. 47, two raising jigs 80 are attached to the lower portion of the opening end portion of the socket 20 of the second pipe 14, and the socket 20 (the other end portion) of the second pipe 14 is raised by the raising jigs 80. Thereby, the second pipe 14 floats upward above the second conveyance carriage 15. Then, the bicycle 9 and the second conveyance carriage 15 are retracted, and the second conveyance carriage 15 is pulled out from below the second pipe 14 to the near side of the second pipe 14 and retracted to the rear of the second pipe 14.

Next, as shown in fig. 48, the divided rails 18 of the rails 17 below the second pipe 14 are removed and placed on the temporary placement plate 26 of the second conveyance cart 15. A support member 63 such as H-shaped steel is provided below the spigot-side end of the second pipe 14, the ram 84 of the jack 83 of the lifting jig 80 is shortened, and the spigot-side end (the other end) of the second pipe 14 is lowered onto the support member 63 and supported by the support member 63. Thereafter, the two lifting jigs 80 are detached from the open end portion of the socket 20 of the second pipe 14.

Thereafter, as shown in fig. 49, the inclined rail portion 104 is attached to the rear end portion of the horizontal rail portion 105 so as to project rearward from the socket 20 of the second pipe 14, and the rear end portion of the inclined rail portion 104 is communicated with the rail 17.

Then, as shown in fig. 50, the hook of the wire rope 107 of the bicycle 9 is hooked on the first conveyance carriage 12 in the second pipe 14, and the winch 108 is operated to wind up the wire rope 107. Thereby, the first conveyance carriage 12 is retracted onto the horizontal rail portion 105 in the second pipe 14 and is lowered from the inclined rail portion 104 onto the rail 17.

Thus, the first pipe 11 and the second pipe 14 are joined to the last pipe 4 of the pipeline 2, and the pipeline 2 in the pipeline installation tunnel 1 is extended by repeating the joining step.

In the first and second embodiments, as shown in fig. 11, the engaging pin 36 (an example of an engaging member) that is engageable with and disengageable from the second transport carriage 15 is provided at the other end portion of the connecting member 28 (that is, the second connecting member 30), and the switching device 37 is provided at the second connecting member 30, but the engaging pin 36 (an example of an engaging member) that is engageable with and disengageable from the first transport carriage 12 may be provided at one end portion of the connecting member 28 (that is, the first connecting member 29), and the switching device 37 may be provided at the first connecting member 29.

Accordingly, by operating the operating lever 45 and operating the switching device 37, the engagement pin 36 is switched from the engagement position P1 to the disengagement position P2, and the connection between the first conveyance carriage 12 and the connecting member 28 is released. At this time, since the operation lever 45 can be operated so that the first tube 11 and the second tube 14 do not interfere with each other, even when the space below the first tube 11 placed on the first conveyance carriage 12 is narrow, the connection between the first conveyance carriage 12 and the connection member 28 can be easily released by operating the operation lever 45. This can reduce the labor and time required for the operation of detaching the coupling member 28 and separating the first conveyance carriage 12 from the second conveyance carriage 15.

Further, a first engagement pin that is freely engageable with and disengageable from the first transport carriage 12 may be provided at one end portion of the coupling member 28, a second engagement pin that is freely engageable with and disengageable from the second transport carriage 15 may be provided at the other end portion of the coupling member 28, and the coupling member 28 may be provided with a first switching device that switches the first engagement pin from the engaged state to the disengaged state and a second switching device that switches the second engagement pin from the engaged state to the disengaged state.

In each of the above embodiments, the socket 19 of another pipe is inserted into the socket 20 of the pipe joined to the pipe 2 and the pipes are joined to each other, but the socket 20 of another pipe may be inserted into the socket 19 of the pipe joined to the pipe 2 and the pipes may be joined to each other.

In each of the above embodiments, the coil spring 54 is provided in the connecting plate 27 of the second conveyance carriage 15, but the coil spring 54 may not be provided.

In the above embodiment, each of the pipes 4, 11, and 14 has the socket 19 at one end and the socket 20 at the other end, but the present invention can also be applied to a case where a pipe having only one of the socket 19 and the socket 20 is joined.