阅读说明：本技术 一种农村供水工程用顶管管道防护结构 (Pipe jacking pipeline protection structure for rural water supply engineering ) 是由 高秋霞 宋波 孟现敬 段攀 郭香利 孙志森 宋世彪 于 2021-08-28 设计创作，主要内容包括：本申请涉及一种顶管管道施工的技术领域,尤其是涉及一种农村供水工程用顶管管道防护结构,其包括混凝土预制管和设置于混凝土预制管内部的钢管,所述钢管的外侧壁上设置有防腐层,所述混凝土预制管的端部位置与钢管之间设置有封堵板,所述混凝土预制管内侧与钢管外侧之间的空隙内填充有混凝土层。本申请具有减少钢管使用过程中在混凝土预制管内振动的效果。(The utility model belongs to the technical field of the technique of a pipe-jacking pipe line construction and specifically relates to a pipe-jacking pipe line protective structure for rural water supply engineering is related to, it includes the precast concrete pipe and sets up in the inside steel pipe of precast concrete pipe, be provided with the anticorrosive coating on the lateral wall of steel pipe, be provided with the shutoff board between the tip position of the precast concrete pipe and the steel pipe, the space intussuseption between the precast concrete intraductal side and the steel pipe outside is filled with concrete layer. This application has the effect that reduces vibration in the prefabricated intraductal at the concrete in the steel pipe use.)

1. The utility model provides a rural push pipe pipeline protective structure for water supply engineering, includes precast concrete pipe (1) and sets up in inside steel pipe (3) of precast concrete pipe (1), its characterized in that: the concrete pipe is characterized in that an anti-corrosion layer (4) is arranged on the outer side wall of the steel pipe (3), a plugging plate (6) is arranged between the end part of the concrete prefabricated pipe (1) and the steel pipe (3), and a concrete layer (5) is filled in a gap between the inner side of the concrete prefabricated pipe (1) and the outer side of the steel pipe (3).

2. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 1, characterized in that: the center line of the steel pipe (3) is positioned right below the center line of the concrete prefabricated pipe (1).

3. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 1, characterized in that: the blocking plate (6) is formed by bricks, and a leakage-proof layer (61) is arranged on one surface of the blocking plate (6) facing the end part of the concrete prefabricated pipe (1).

4. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 1, characterized in that: the steel pipe is characterized in that a steel reinforcement cage (7) is arranged on the outer side of the steel pipe (3), the steel reinforcement cage (7) comprises longitudinal ribs (71) and transverse ribs (72), the longitudinal ribs (71) are arranged in parallel to the steel pipe (3), the transverse ribs (72) are wound on the steel pipe (3), and the longitudinal ribs (71) and the transverse ribs (72) are fixedly connected relatively.

5. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 4, characterized in that: the concrete prefabricated pipe is characterized in that a supporting device (8) used for reducing friction between the steel pipe (3) and the concrete prefabricated pipe (1) is arranged below the steel pipe (3), and the supporting devices (8) are symmetrically arranged on two sides of the steel pipe (3) and are arranged in a plurality of positions at intervals along the length direction of the steel pipe (3).

6. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 5, characterized in that: support arrangement (8) include chassis (81), support (82) and gyro wheel (83), place on the inner wall of precast concrete pipe (1) chassis (81), the center of support (82) is rotated and is connected on chassis (81), gyro wheel (83) have at least three, and gyro wheel (83) rotate to be connected on support (82), and a plurality of gyro wheels (83) are evenly distributed around the center circumference of support (82).

7. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 5, characterized in that: the supporting device (8) comprises a wheel frame (84) and rollers (83), the wheel frame (84) is fixed on the transverse ribs (72), the rollers (83) are rotatably connected to the wheel frame (84), a plurality of supporting blocks (74) used for supporting the steel pipes (3) are arranged on the transverse ribs (72), and the rollers (83) are used for being supported on the inner wall of the concrete prefabricated pipe (1) in a rolling mode.

8. The pipe-jacking pipeline protection structure for the rural water supply engineering according to any one of claims 4 to 7, characterized in that: the transverse rib (72) is in an annular shape formed by oppositely fixing two semi-circular arc ribs (721), and the longitudinal rib (71) is positioned on the inner side of the annular shape of the transverse rib (72).

9. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 2, characterized in that: the anti-floating device (9) is arranged above the steel pipe (3), the anti-floating device (9) comprises a lower mounting frame (91) and an upper movable plate (92), the lower mounting frame (91) is used for abutting against the upper portion of the outer side wall of the steel pipe (3), the upper movable plate (92) is used for abutting against the upper portion of the inner side wall of the concrete prefabricated pipe (1), and an adjusting device for adjusting the height of the upper movable plate (92) is arranged between the lower mounting frame (91) and the upper movable plate (92).

10. The pipe-jacking pipeline protection structure for the rural water supply engineering according to claim 9, characterized in that: adjusting device includes screw rod (93) and nut (94) of threaded connection on screw rod (93), the vertical setting of screw rod (93), the upper end of screw rod (93) is fixed on last fly leaf (92), and the lower extreme of screw rod (93) inserts down on mounting bracket (91) to nut (94) butt is on mounting bracket (91) down.

Technical Field

The application relates to the technical field of pipe jacking pipeline construction, in particular to a pipe jacking pipeline protection structure for rural water supply engineering.

Background

In municipal works, the laying of pipelines occupies a large amount of work, in the laying process of the pipelines, the pipelines need to be laid at the positions below the ground in an open-cut or underground-cut mode, the underground-cut mode can be performed in a pipe-jacking construction mode, the pipe-jacking construction reduces disturbance to the stratum, meanwhile, the removal of a large amount of ground facilities and buildings is avoided, the construction efficiency is high, and the removal cost is reduced.

In the push pipe work progress, the precast concrete pipe that the push pipe adopted has the pressure effect that bears the outside, and when inside was led to water, precast concrete pipe can't bear great water pressure, consequently need lay the steel pipe in precast concrete pipe's inside, and the water pressure can be born to the inside of steel pipe, and precast concrete pipe is used for providing the steel pipe and lays required space.

However, the inventor believes that the steel pipes laid in the precast concrete pipes are easily vibrated during use, so that damage due to friction with the precast concrete pipes often occurs.

Disclosure of Invention

In order to reduce vibration in the concrete prefabricated pipe in the use process of the steel pipe, the application provides a pipe jacking pipeline protection structure for rural water supply engineering.

The application provides a rural push pipe pipeline protective structure for water supply engineering adopts following technical scheme:

the utility model provides a rural push pipe pipeline protective structure for water supply engineering, includes the precast concrete pipe and sets up in the inside steel pipe of precast concrete pipe, be provided with the anticorrosive coating on the lateral wall of steel pipe, be provided with the shutoff board between the tip position of precast concrete pipe and the steel pipe, the space intussuseption between the precast concrete intraductal side and the steel pipe outside is filled with concrete layer.

Through adopting above-mentioned technical scheme, during the use, the precast concrete pipe can provide the space for the setting of steel pipe, the steel pipe penetrates in the precast concrete pipe by the inside of precast concrete pipe, steel pipe and precast concrete pipe tip make the space shutoff between steel pipe and the precast concrete pipe through the shutoff board, and then conveniently pour the concrete in order to form concrete layer between precast concrete pipe and the steel pipe, concrete layer is located between steel pipe and the precast concrete pipe, the steel pipe passes through concrete layer and the precast concrete pipe forms wholly, and then reduced the steel pipe and took place the friction of vibration and precast concrete pipe in the use, the anticorrosive coating of the outside parcel of steel pipe is also difficult to damage simultaneously, the life of steel pipe has been improved.

Preferably, the center line of the steel pipe is positioned right below the center line of the precast concrete pipe.

By adopting the technical scheme, the central line of the steel pipe is positioned under the central line of the precast concrete pipe, so that the thickness of the concrete layer on the upper part of the steel pipe is greater than that of the concrete layer on the lower part of the steel pipe, the concrete layer on the upper part of the steel pipe can bear greater pressure, and the service life and the bearing capacity of the precast concrete pipe are further improved.

Preferably, the plugging plate is formed by bricks, and a leakage-proof layer is arranged on one surface of the plugging plate facing to the end part of the concrete prefabricated pipe.

Through adopting above-mentioned technical scheme, the shutoff board that the fragment of brick formed is convenient to the scene setting of shutoff board to set up leak protection layer on the shutoff board, the poor problem of the sealed of fragment of brick formation shutoff board can be overcome on leak protection layer, and then the construction of the shutoff board of being convenient for.

Preferably, the outside of steel pipe is provided with the steel reinforcement cage, and the steel reinforcement cage is including indulging muscle and horizontal muscle, indulges the muscle and is on a parallel with the steel pipe setting, and horizontal muscle is around on the steel pipe to indulge the relative fixed connection of muscle and horizontal muscle.

Through adopting above-mentioned technical scheme, the outside of steel pipe sets up the steel reinforcement cage, and the steel reinforcement cage is located the concrete layer, and the steel reinforcement cage can cooperate concrete layer, makes concrete layer's intensity bigger, further improves the fixed fastness to the steel pipe, improves concrete layer's bearing capacity simultaneously.

Preferably, a plurality of supporting devices for reducing friction between the steel pipe and the precast concrete pipe are symmetrically arranged on two sides of the steel pipe and are arranged at intervals along the length direction of the steel pipe.

Through adopting above-mentioned technical scheme, strutting arrangement sets up in the below of steel pipe, and strutting arrangement can reduce the friction damage that the steel pipe takes place when the prefabricated intraductal removal of concrete, and strutting arrangement's setting makes the distance between the below of steel pipe and the prefabricated pipe of concrete fix a position more easily simultaneously, and then makes things convenient for the installation of steel pipe.

Preferably, strutting arrangement includes chassis, support and gyro wheel, the chassis is placed on the inner wall of precast concrete pipe, and the center of support is rotated and is connected on the chassis, the gyro wheel has three at least, and the gyro wheel rotates and connects on the support, and a plurality of gyro wheels are evenly distributed round the center circumference of support.

Through adopting above-mentioned technical scheme, the support rotates to be connected on the chassis, when horizontal muscle removes the position that is close to in the gyro wheel, can rotate for the chassis by the support, makes horizontal muscle pass through between two gyro wheels, the removal of the steel pipe of being convenient for.

Preferably, the supporting device comprises a wheel frame and a roller, the wheel frame is fixed on a transverse rib, the roller is rotatably connected to the wheel frame, the transverse rib is provided with a plurality of supporting blocks for supporting the steel pipe, and the roller is used for being supported on the inner wall of the concrete prefabricated pipe in a rolling manner.

Through adopting above-mentioned technical scheme, the wheel carrier is fixed on horizontal muscle, when inserting along with the steel pipe to the precast concrete pipe, strutting arrangement installs the outside of steel pipe to roll in precast concrete pipe through the gyro wheel in order to reduce the friction between steel pipe and the precast concrete pipe.

Preferably, the transverse rib is an annular formed by fixing two semicircular arc ribs relatively, and the longitudinal rib is positioned on the inner side of the annular shape of the transverse rib.

Through adopting above-mentioned technical scheme, two semicircle ribs relatively fix and form annular horizontal muscle, when the installation, will indulge the muscle earlier along the steel pipe setting after, will violently the muscle again along with the steel pipe insert relatively detain on the steel pipe in proper order, make things convenient for the setting of steel reinforcement cage.

Preferably, the top of steel pipe is provided with anti floating device, anti floating device includes mounting bracket and last fly leaf down, the mounting bracket is used for the butt on the upper portion of steel pipe lateral wall down, goes up the fly leaf and is used for the butt on the upper portion of the inside wall of precast concrete pipe, be provided with the adjusting device of fly leaf height in the regulation down between mounting bracket and the last fly leaf.

Through adopting above-mentioned technical scheme, the mounting bracket setting is on the steel pipe down, go up the fly leaf and pass through adjusting device and connect under on the mounting bracket, when the steel pipe enters into the precast concrete intraductal, adjusting device makes and leaves the clearance between fly leaf and the precast concrete inboard wall, after putting the steel pipe in place again, the fly leaf butt is gone up on the inner wall of precast concrete pipe to rethread adjusting device messenger, reduce the come-up that the steel pipe takes place at construction concrete layer, make things convenient for the staff to enter into the steel pipe and adjust adjusting device under the circumstances of steel pipe and precast concrete pipe eccentric settings simultaneously.

Preferably, adjusting device includes screw rod and the nut of threaded connection on the screw rod, the vertical setting of screw rod, the upper end of screw rod is fixed on last fly leaf, and the lower extreme of screw rod inserts down on the mounting bracket to the nut butt is on mounting bracket down.

Through adopting above-mentioned technical scheme, the one end of screw rod is fixed on last fly leaf, and nut threaded connection is on the screw rod, rotates the nut and is located the position on the screw rod with adjusting nut, and then can adjust the fly leaf for the height of lower mounting bracket, makes and goes up the fly leaf butt on the precast concrete pipe, and the screw rod is adjusted last fly leaf with the nut, and cost expense is less.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the steel pipe penetrates into the concrete prefabricated pipe from the interior of the concrete prefabricated pipe, concrete is poured between the concrete prefabricated pipe and the steel pipe to form a concrete layer, and the steel pipe and the concrete prefabricated pipe form a whole through the concrete layer, so that the friction between the steel pipe and the concrete prefabricated pipe caused by vibration in the using process is reduced, and the service life of the steel pipe is prolonged;

2. the center line of the steel pipe is positioned right below the center line of the precast concrete pipe, so that the thickness of the concrete layer at the upper part of the steel pipe is larger than that at the lower part of the steel pipe, and the service life of the precast concrete pipe is prolonged;

3. can reduce the friction damage that the steel pipe takes place when the prefabricated intraductal removal of concrete through strutting arrangement, strutting arrangement's setting makes the below of steel pipe and the distance between the prefabricated pipe of concrete fix a position more easily simultaneously, makes things convenient for the installation of steel pipe.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a first embodiment of the present application;

FIG. 3 is a schematic view of an installation structure of a supporting device in one embodiment of the present application;

FIG. 4 is a schematic structural view of a support device embodying all the first aspect of the present application;

FIG. 5 is a schematic view of an installation structure of a supporting device in the second embodiment of the present application;

fig. 6 is a schematic view of the mounting structure of the support block in the second embodiment of the present application.

Description of reference numerals: 1. prefabricating a pipe by concrete; 2. a protective layer; 3. a steel pipe; 4. an anticorrosive layer; 5. a concrete layer; 6. a plugging plate; 61. a leakage-proof layer; 7. a reinforcement cage; 71. longitudinal ribs; 72. transverse ribs; 721. semicircular arc ribs; 73. a sleeve; 74. a support block; 8. a support device; 81. a chassis; 82. a support; 83. a roller; 84. a wheel carrier; 9. an anti-floating device; 91. a lower mounting frame; 92. an upper movable plate; 93. a screw; 94. and a nut.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a pipe jacking pipeline protection structure for rural water supply engineering.

Example one

A pipe-jacking pipeline protection structure for rural water supply engineering is disclosed, referring to figure 1, and comprises a concrete prefabricated pipe 1, wherein the concrete prefabricated pipe 1 is provided with a plurality of sections, two adjacent sections can be hermetically connected in a socket joint mode, the concrete prefabricated pipe 1 is laid by adopting a pipe-jacking construction process, after the concrete prefabricated pipe 1 is laid, an outer protection layer 2 is formed on the outer side of the concrete prefabricated pipe 1 in a backfill grouting construction mode, backfill grouting is performed by adopting a slurry pump, grouting pressure and grouting amount are controlled, the lifting condition of a road surface is observed in the grouting process, and the lifting of the road surface is controlled to be less than 2 mm.

Referring to fig. 1, lay steel pipe 3 in the inside of precast concrete pipe 1, steel pipe 3 diameter ratio precast concrete pipe 1 diameter is 60cm at least for, and steel pipe 3 lays along the length direction of precast concrete pipe 1, is provided with anticorrosive coating 4 on the outer wall of steel pipe 3, and anticorrosive coating 4 adopts the winding of three-layer polyethylene to form, and thickness more than or equal to 4.2 mm. The space between the steel pipe 3 and the concrete prefabricated pipe 1 is filled with a concrete layer 5, and the concrete layer 5 is formed by self-compacting concrete, so that the longer concrete prefabricated pipe 1 can be filled with the concrete conveniently.

Referring to fig. 1, a plugging plate 6 is arranged at the end of a concrete prefabricated pipe 1, the plugging plate 6 is formed by building bricks to fill the end of the concrete prefabricated pipe 1 and is arranged between the concrete prefabricated pipe 1 and a steel pipe 3, the thickness of the plugging plate 6 is selected according to the pressure required for pouring a concrete layer 5, a leakage-proof layer 61 is coated on one surface of the plugging plate 6 at the end of the concrete prefabricated pipe 1, the leakage-proof layer 61 is uniformly coated on the surface of the plugging plate 6 by cement mortar, and the coated thickness is 2 cm. After the construction of the plugging plate 6 and the leakage-proof layer 61 is completed and the required strength is reached, the self-compacting concrete is poured between the steel pipe 3 and the concrete prefabricated pipe 1 to form the concrete layer 5, and a pouring hole and an exhaust hole can be reserved on the plugging plate 6 for facilitating the manufacture of the concrete layer 5. After reaching predetermined intensity after concrete layer 5 forms, concrete layer 5 fully fills in precast concrete pipe 1 and steel pipe 3 to make steel pipe 3's rigidity, reduce steel pipe 3 and rock at the in-process that uses, thereby can reduce the damage that relative friction and take place between the outer wall of steel pipe 3 and precast concrete pipe 1.

Referring to fig. 1 and 2, the steel pipe 3 and the precast concrete pipe 1 are both in a circular pipe shape, the center line of the steel pipe 3 is not coincident with the center line of the precast concrete pipe 1, and the center line of the steel pipe 3 is located right below the center line of the precast concrete pipe 1, so that the distance from the upper part of the steel pipe 3 to the inner wall of the upper part of the precast concrete pipe 1 is greater than the distance from the lower part of the steel pipe 3 to the inner wall of the lower part of the precast concrete pipe 1. After the formed concrete layer 5 is filled in the steel pipe 3 and the concrete prefabricated pipe 1, the thickness of the upper part of the concrete layer 5 is larger than that of the lower part of the concrete layer 5. Concrete layer 5 can support the pressure of top transmission with the cooperation of precast concrete pipe 1, improves precast concrete pipe 1's life and bearing capacity.

Referring to fig. 2 and 3, a reinforcement cage 7 is arranged outside the steel pipe 3, the reinforcement cage 7 includes a longitudinal rib 71 and a transverse rib 72, the longitudinal rib 71 is parallel to the length direction of the steel pipe 3, the transverse rib 72 is surrounded on the steel pipe 3, the longitudinal rib 71 and the transverse rib 72 are crossed, and then the longitudinal rib 71 and the transverse rib 72 are connected by welding and fixing at the crossed position, so as to form the reinforcement cage 7. The steel reinforcement cage 7 enters into the precast concrete pipe 1 along with the steel pipe 3 inserts the in-process in the precast concrete pipe 1 simultaneously, and then steel reinforcement cage 7 forms in concrete layer 5, and the inboard 2-4cm apart from the outer wall of steel pipe 3 of steel reinforcement cage 7 makes steel reinforcement cage 7 can be close to one side in steel pipe 3 to concrete layer 5 and strengthens, improves concrete layer 5's intensity, further improves the fixed fastness to steel pipe 3. Horizontal muscle 72 adopts two relative concatenations of semicircle muscle strip 721 to form, and two semicircle muscle strips 721 sets up relatively, indulges muscle 71 simultaneously and is located horizontal muscle 72 annular inside, and then makes horizontal muscle 72 wind on steel pipe 3, fixes through the tip welding relative at two semicircle muscle strips 721 again.

Referring to fig. 3 and 4, a support device 8 is disposed below the steel pipe 3, and the support device 8 is used for supporting the steel pipe 3 and reducing friction when the steel pipe 3 moves along the length direction of the precast concrete pipe 1. The supporting device 8 comprises a bottom frame 81, three support frames 82 and three rollers 83, the number of the rollers 83 is three, the center position of each support frame 82 is rotatably connected to the bottom frame 81, three mounting positions are uniformly arranged on each support frame 82 around the circumference of the center, each mounting position is rotatably connected with one roller 83, and the rotating center lines of the three rollers 83 are parallel to the rotating axis of the support frame 82, which is compared with the rotating axis of the bottom frame 81, and the distance of the rotating center lines is equal to that of the support frame 82. The rollers 83 are made of a plastic material. On the inner wall of prefabricated pipe of concrete 1 was placed to chassis 81, gyro wheel 83 was towards steel pipe 3, when steel pipe 3 inserted in the prefabricated pipe of concrete 1, the lateral wall butt of steel pipe 3 was on gyro wheel 83, and when steel pipe 3 inserted to the prefabricated pipe of concrete 1, gyro wheel 83 rotated, and then can reduce the anticorrosive coating 4 in the steel pipe 3 outside and take place to damage. When the transverse rib 72 moves to a position close to the roller 83 along with the steel pipe 3, the bracket 82 is rotated by the action force of the transverse rib 72, and the transverse rib 72 can pass through the support device 8. Meanwhile, the two supporting devices 8 are symmetrically arranged about the vertical central plane of the steel pipe 3, and the two supporting devices 8 are symmetrically abutted against the two positions of the steel pipe 3, so that the steel pipe 3 is relatively stable. Strutting arrangement 8 sets up a plurality ofly along the length direction interval of precast concrete pipe 1, and strutting arrangement 8's setting can make and leave the design clearance between steel pipe 3 and the precast concrete pipe 1 and be used for filling concrete layer 5.

Referring to fig. 3, an anti-floating device 9 is arranged above the steel pipe 3, the anti-floating device 9 includes a lower mounting frame 91 and an upper movable plate 92, the lower mounting frame 91 is used for abutting on the upper portion of the outer side wall of the steel pipe 3, the upper movable plate 92 is used for abutting on the upper portion of the inner side wall of the prefabricated concrete pipe 1, the whole upper movable plate 92 is in an arc shape attached to the inner side wall of the prefabricated concrete pipe 1, at least one screw 93 is fixedly welded on the upper movable plate 92, in the present embodiment, the screw 93 is provided with two screws, the screw 93 is vertically arranged, a nut 94 is screwed on the screw 93, the upper end of the screw 93 is fixed on the upper movable plate 92, the lower end is inserted into the lower mounting frame 91, and the nut 94 abuts on the lower mounting frame 91. The lower part of the lower mounting frame 91 is arranged to be in an arc shape attached to the outer side wall of the steel pipe 3. When the anti-floating device 9 enters the precast concrete pipe 1 along with the steel pipe 3, a gap is reserved between the upper movable frame and the inner wall of the precast concrete pipe 1, after the steel pipe 3 is installed in the precast concrete pipe 1, the position of the nut 94 is adjusted, and because the steel pipe 3 and the precast concrete pipe 1 are eccentrically arranged, a large space is reserved between the upper part of the steel pipe 3 and the precast concrete pipe 1, so that a worker can conveniently enter the precast concrete pipe 1 to adjust the position of the nut 94, and further the upper movable plate 92 is abutted against the inner wall of the precast concrete pipe 1. Meanwhile, before the concrete layer 5 is poured, water needs to be filled in the steel pipe 3, and the upward floating of the steel pipe 3 is reduced by further matching with the anti-floating device 9.

Example two

A pipe jacking pipeline protection structure for rural water supply engineering is disclosed, referring to fig. 5 and fig. 6, which is different from the first embodiment in that: the supporting device 8 is fixed on the transverse rib 72, and the supporting device 8 supports the steel pipe 3 through the reinforcement cage 7 and reduces the friction force when the steel pipe 3 moves along the length direction of the concrete prefabricated pipe 1. The supporting device 8 includes a wheel frame 84, at least one roller 83 is disposed on the wheel frame 84, two rollers 83 are disposed in this embodiment, the rollers 83 are rotatably connected to the wheel frame 84, and the wheel frame 84 is welded to the transverse rib 72. The transverse rib 72 is fixedly connected by two semi-circular arc ribs 721 with sleeves 73 at the ends. Both ends of the sleeve 73 are respectively in threaded connection with the end part of one semi-circular rib 721, and then the two semi-circular ribs 721 form a circular transverse rib 72 through the sleeve 73. The supporting blocks 74 are arranged on the transverse ribs 72 and sleeved with the plurality of supporting blocks 74, the supporting blocks 74 are made of plastic materials, the supporting blocks 74 are sleeved on the semi-circular-arc ribs 721, then the semi-circular-arc ribs 721 form the transverse ribs 72, and the plurality of supporting blocks 74 are supported on the lower portion of the steel pipe 3. During the installation, along with steel pipe 3 constantly insert in the precast concrete pipe 1, detain the outside of steel pipe 3 relatively at steel pipe 3 and relative fixed formation horizontal muscle 72 through two semicircle ribs 721 in the outside of steel pipe 3, then horizontal muscle 72 and the vertical muscle 71 welded fastening who is located horizontal muscle 72 inboard, when strutting arrangement 8 that is located on horizontal muscle 72 enters into precast concrete pipe 1, gyro wheel 83 butt is on the inner wall of precast concrete pipe 1, and along with steel pipe 3's removal, gyro wheel 83 rolls along the length direction of precast concrete pipe 1, and then reduce the damage of anticorrosive coating 4 in the steel pipe 3 outside.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.