阅读说明：本技术 一种远距离连续顶管用分支段预留与复通施工方法 (Branch section reservation and recanalization construction method for long-distance continuous pipe jacking ) 是由 宋红旗 刘茂青 赵宝玉 李东驰 李艳艳 任安安 李文燕 翟艳军 韩东平 刘瑞廷 于 2020-12-31 设计创作，主要内容包括：本发明具体是一种远距离连续顶管用分支段预留与复通施工方法,解决了现有顶管工艺因设置分支段而无法长距离连续顶管的问题。一种远距离连续顶管用分支段预留与复通施工方法,S1：连接装置的预制,连接装置包括连接管与外护管；S2：复通装置的预制,复通装置包括内套管和外套管；S3：外封管的预制；S4：连接装置的安装；S5：顶管作业；S6：检查井的开挖；S7：连接装置的拆除；S8：分支管件的安装；S9：复通装置的安装；S10：复通装置外部功能保护层的设置。本发明实现了管道长距离连续顶管并留设分支段的目的,既能保证施工质量又能加快施工进度、降低施工成本,而且具有操作方便、省力、安全的优点。(The invention particularly relates to a branch section reservation and recanalization construction method for long-distance continuous pipe jacking, which solves the problem that the long-distance continuous pipe jacking cannot be realized due to the arrangement of branch sections in the existing pipe jacking process. A branch section reservation and recanalization construction method for long-distance continuous jacking pipes is disclosed, and comprises the following steps of S1: prefabricating a connecting device, wherein the connecting device comprises a connecting pipe and an outer protecting pipe; s2: prefabricating a recanalization device, wherein the recanalization device comprises an inner sleeve and an outer sleeve; s3: prefabricating an outer sealing pipe; s4: mounting a connecting device; s5: pipe jacking operation; s6: excavating an inspection well; s7: dismantling the connecting device; s8: installing branch pipe fittings; s9: installing a recovery device; s10: and arranging an external functional protection layer of the recovery device. The invention realizes the purpose of continuously jacking the pipeline in a long distance and reserving branch sections, can ensure the construction quality, quicken the construction progress and reduce the construction cost, and has the advantages of convenient operation, labor saving and safety.)

1. A branch section reservation and recanalization construction method for long-distance continuous jacking pipes is characterized by comprising the following steps: the method comprises the following steps:

s1: prefabrication of the connecting device: the connecting device comprises a connecting pipe, a bearing pipe (101) is arranged at the head end part of the connecting pipe, an inserting mechanism is arranged at the tail end part of the connecting pipe, two ejection bolts (102) which are oppositely arranged up and down penetrate through the outer side wall of the bearing pipe (101), and the tail ends of the two ejection bolts (102) face inwards; the connecting pipe is composed of two arc-shaped connecting pipe pieces (103) which are distributed up and down, and the two connecting pipe pieces (103) are detachably connected; an outer protecting pipe is sleeved outside the connecting pipe; the outer diameter of the outer protecting pipe is consistent with the outer diameter of the first pipeline (2), and the length of the outer protecting pipe is consistent with that of the connecting pipe; the outer protecting pipe is composed of two arc-shaped outer protecting pipe pieces (104) which are distributed up and down, and the two outer protecting pipe pieces (104) are detachably connected; a plurality of arc-shaped inner ribs (105) which are distributed in parallel left and right are fixed on the inner side wall of each outer protective duct piece (104);

s2: prefabricating a recanalization device: the recanalization device comprises an inner sleeve (501) and an outer sleeve (502), the right part of the inner sleeve (501) penetrates through the left part of the outer sleeve (502), and a plurality of sealing rubber rings (503) distributed left and right are arranged at the joint part of the inner sleeve and the outer sleeve; a plurality of positioning ear plates (504) which are distributed equidistantly along the circumferential direction and are vertical in the longitudinal direction are fixed at the left part of the outer side wall of the inner sleeve (501); a baffle plate (505) which is arranged in parallel with the positioning ear plate and is fixed on the outer side wall of the inner sleeve (501) is arranged on the left side of each positioning ear plate (504); each positioning ear plate (504) is provided with an adjusting bolt (506) which is arranged on the right side of the baffle (505) in a penetrating way and is transversely arranged; a plurality of fixing plates (507) which are opposite to the positioning lug plates (504) one by one and are provided with screw holes are fixed at the right part of the outer side wall of the outer sleeve (502), and the tail parts of the adjusting bolts (506) are screwed in the screw holes of the fixing plates (507) one by one; a first connecting mechanism is arranged at the left end part of the inner sleeve (501); the right end part of the outer sleeve (502) is provided with a second connecting mechanism;

s3: prefabricating an outer sealing pipe: the outer sealing pipe is composed of two arc-shaped outer sealing pipe pieces (6) which are distributed up and down, and the two outer sealing pipe pieces (6) are detachably connected; the outer duct piece (6) comprises a first straight duct piece (601), a first transition duct piece (602), a second straight duct piece (603), a second transition duct piece (604) and a third straight duct piece (605) which are sequentially connected into a whole from left to right; the inner diameter of the first straight pipe piece (601) and the inner diameter of the third straight pipe piece (605) are both smaller than the inner diameter of the second straight pipe piece (603); glue injection ports (7) are formed in the side wall of the first transition duct piece (602) and the side wall of the second transition duct piece (604);

s4: installation of the connecting device: according to the design requirement of the pipeline, the connecting device is installed at the branch section of the pipeline, and the installation process comprises the following steps: firstly, placing a connecting pipe between a first pipeline (2) and a second pipeline (3), carrying out socket joint connection on the tail end of the connecting pipe and a bearing part of the second pipeline (3) through a socket joint mechanism, carrying out socket joint connection on the bearing pipe and a socket joint part of the first pipeline (2), and then screwing two ejection bolts (102) to ensure that the tail ends of the two ejection bolts (102) are both attached to the socket joint part of the first pipeline (2), thereby completing the installation of the connecting pipe; finally, two outer protective pipe pieces (104) are installed on the outer side of the connecting pipe and connected with the two outer protective pipe pieces (104), so that the inner arc surfaces of the inner ribs (105) are attached to the outer side wall of the connecting pipe, and the installation of the connecting device is completed;

s5: pipe jacking operation: carrying out pipe jacking operation on the first pipeline (2) and the second pipeline (3) provided with the connecting device, so that the connecting device is synchronously jacked with the first pipeline (2) and the second pipeline (3);

s6: excavation of an inspection well: excavating an inspection well pit at a corresponding position of the pipeline branch section, and cleaning the surrounding soil body after finding a connecting device until the construction requirement of the inspection well is met;

s7: dismantling the connecting device: firstly, removing two outer protective pipe pieces (104), then removing the connection of the two connecting pipe pieces (103), then sequentially screwing two ejection bolts (102), and inwards ejecting the two ejection bolts (102) to drive the inner side wall of the bearing pipe (101) to be separated from the inserting part of the first pipeline (2), so that the purpose of separating the connecting pipe pieces (103) from the first pipeline (2) is realized, and the removal of the connecting device is completed;

s8: installation of the branch pipe fitting (4): connecting a branch pipe fitting (4) of the pipeline branch section to the right end part of the first pipeline (2) according to the design requirement of the pipeline;

s9: installation of the recovery device: firstly, the left end of an inner sleeve (501) is connected to the right end of a branch pipe fitting (4) through a first connecting mechanism, then each adjusting bolt (506) is adjusted, the adjusting bolts (506) rotate to drive a fixing plate (507) to move from left to right, so that an outer sleeve (502) is driven to move rightwards until the right end of the outer sleeve (502) is contacted with the left end of a second pipeline (3), and finally the right end of the outer sleeve (502) is connected to the left end of the second pipeline (3) through a second connecting mechanism, so that the installation of the multi-pass device is completed;

s10: setting of the external functional protection layer (8) of the recovery device: firstly, two first straight pipe pieces (601) are sleeved at the right end part of a branch pipe fitting (4), then two third straight pipe pieces (605) are sleeved at the left end part of a second pipeline (3), then two outer sealing pipe pieces (6) are connected, then a functional protection material is filled into an inner cavity of the outer sealing pipe through a glue injection port (7), an annular functional protection layer (8) is formed, and the setting of the external functional protection layer (8) of the recanalization device is completed.

2. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: the branch pipe fitting (4) is a three-way joint or a valve.

3. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: the first connecting mechanism is a bearing pipe I (508) which is in socket joint with the inserting part of the branch pipe fitting (4) and is integrated with the inner sleeve (501); the second connecting mechanism is an inserting pipe (509) which is connected with the bearing part socket of the second pipeline (3) and integrated with the outer sleeve (502).

4. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: the first connecting mechanism and the second connecting mechanism are both vertical flanges (510).

5. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: two vertically-arranged connecting bolts (107) with locking nuts (106) are commonly penetrated through the side walls of the two connecting pipe pieces (103); the lateral wall of every connection section of jurisdiction (103) all forms countersunk groove (108) that distribute about two along vertical inside sunken, and countersunk groove (108) of two connection section of jurisdiction (103) just right from top to bottom, and the mounting hole of through connection section of jurisdiction (103) inside wall, lateral wall is all seted up to the tank bottom of every countersunk groove (108), and connecting bolt (107) are worn in the mounting hole.

6. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: one end of the inner side wall of the outer protecting duct piece (104) and one end of the inner side wall of the outer sealing duct piece (6) in the front-back direction are respectively and integrally provided with a transverse rib strip (9), and the other end of the inner side wall is respectively and integrally provided with a strip-shaped clamping groove (10) which is transversely arranged and matched with the rib strip (9) in shape; the rib strips (9) and the strip-shaped clamping grooves (10) of the two outer sealing duct pieces (6) are arranged in an exchange way and are matched with each other; the rib strips (9) and the strip-shaped clamping grooves (10) of the two outer protective pipe sheets (104) are arranged in an exchange way and are matched with each other.

7. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: in construction, when the interface types of the first pipeline (2) and the connecting device, the second pipeline (3) and the connecting device, the first pipeline (2) and the branch pipe fitting (4), the recovery device and the branch pipe fitting (4) and the recovery device and the second pipeline (3) are not matched, the disc bearing short pipe (11) or the disc plug short pipe (12) is used for conversion.

8. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: the splicing mechanism is two limiting insertion strips (109) which are integrally fixed on the tail end face of the connecting pipe and vertically distributed, and the outer surfaces of the two limiting insertion strips (109) are attached to the bearing part of the second pipeline (3).

9. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: the inner sleeve (501) is in a straight pipe shape; the outer sleeve (502) comprises a left straight pipe section and a right straight pipe section which are distributed left and right and are connected into a whole, and the inner diameter of the left straight pipe section is larger than that of the right straight pipe section.

10. The branch section reservation and recanalization construction method for the long-distance continuous jacking pipe according to claim 1, characterized in that: the number of the positioning ear plates (504) is three; the number of the sealing rubber rings (503) positioned between the inner sleeve (501) and the outer sleeve (502) is two; the connecting pipe, the inner sleeve (501) and the outer sleeve (502) are all made of steel; the outer protecting pipe and the outer sealing pipe are both made of hard plastics; the functional protective layer (8) is made of foam sealant.

Technical Field

The invention relates to a pipeline construction method in municipal public works, in particular to a branch section reservation and recanalization construction method for long-distance continuous jacking pipes.

Background

In the underground pipeline construction of the ductile cast iron pipe in the municipal public works, the pipe jacking process becomes the preferred process for upgrading and reconstructing the underground pipeline of the narrow street in the old city due to the advantages of no excavation, no need of blocking traffic, small interference to the living environment of residents and the like.

However, practice shows that the existing pipe jacking construction method has the following problems in application: due to upgrading and transformation of underground pipelines, a large number of short-distance inspection wells need to be designed for installation and maintenance of branch pipe fittings such as pipeline branches and valves, and the arrangement of the pipeline branches can cause the problems of pipe jacking operation interruption, addition of working pits and the like, so that complicated processes are increased, the construction engineering quantity and the construction cost are increased, the work efficiency is reduced, and potential safety hazards are increased. Therefore, the invention is necessary to invent a branch section reservation and recanalization construction method for long-distance continuous pipe jacking, which can ensure long-distance continuous pipe jacking of an underground pipeline and flexibly set an inspection well according to the functional requirements of the pipeline.

Disclosure of Invention

The invention provides a branch section reservation and recanalization construction method for long-distance continuous pipe jacking, aiming at solving the problem that the existing pipe jacking process cannot realize long-distance continuous pipe jacking due to the arrangement of branch sections.

The invention is realized by adopting the following technical scheme:

a branch section reservation and recanalization construction method for long-distance continuous jacking pipes comprises the following steps:

s1: prefabrication of the connecting device: the connecting device comprises a connecting pipe, a bearing pipe is arranged at the head end part of the connecting pipe, an inserting mechanism is arranged at the tail end part of the connecting pipe, two ejection bolts which are oppositely arranged up and down penetrate through the outer side wall of the bearing pipe, and the tail ends of the two ejection bolts are inward; the connecting pipe is composed of two arc-shaped connecting pipe pieces which are distributed up and down, and the two connecting pipe pieces are detachably connected; an outer protecting pipe is sleeved outside the connecting pipe; the outer diameter of the outer protecting pipe is consistent with the outer diameter of the first pipeline, and the length of the outer protecting pipe is consistent with that of the connecting pipe; the outer protecting pipe consists of two arc-shaped outer protecting pipe pieces which are distributed up and down, and the two outer protecting pipe pieces are detachably connected; a plurality of arc-shaped inner ribs which are distributed in parallel from left to right are fixed on the inner side wall of each outer protective duct piece;

s2: prefabricating a recanalization device: the recanalization device comprises an inner sleeve and an outer sleeve, the right part of the inner sleeve penetrates through the left part of the outer sleeve, and a plurality of sealing rubber rings distributed left and right are arranged at the joint part of the inner sleeve and the outer sleeve; a plurality of positioning ear plates which are distributed equidistantly along the circumferential direction and are vertical in the longitudinal direction are fixed at the left part of the outer side wall of the inner sleeve; the left side of each positioning ear plate is provided with a baffle which is arranged in parallel with the positioning ear plate and is fixed on the outer side wall of the inner sleeve; each positioning ear plate is provided with a regulating bolt which is arranged on the right side of the baffle and transversely; a plurality of fixing plates which are opposite to the positioning lug plates left and right one by one and are provided with screw holes are fixed at the right part of the outer side wall of the outer sleeve, and the tail parts of the adjusting bolts are screwed in the screw holes of the fixing plates one by one; the left end part of the inner sleeve is provided with a first connecting mechanism; the right end part of the outer sleeve is provided with a second connecting mechanism;

s3: prefabricating an outer sealing pipe: the outer sealing pipe consists of two arc-shaped outer sealing pipe pieces which are distributed up and down, and the two outer sealing pipe pieces are detachably connected; the outer sealing duct piece comprises a first straight duct piece, a first transition duct piece, a second straight duct piece, a second transition duct piece and a third straight duct piece which are sequentially connected into a whole from left to right; the inner diameter of the first straight pipe piece and the inner diameter of the third straight pipe piece are both smaller than the inner diameter of the second straight pipe piece; glue injection ports are formed in the side wall of the first transition duct piece and the side wall of the second transition duct piece;

s4: installation of the connecting device: according to the design requirement of the pipeline, the connecting device is installed at the branch section of the pipeline, and the installation process comprises the following steps: firstly, placing a connecting pipe between a first pipeline and a second pipeline, carrying out socket joint connection on the tail end of the connecting pipe and a bearing part of the second pipeline through a socket joint mechanism, carrying out socket joint connection on the bearing pipe and a socket joint part of the first pipeline, and then screwing two ejection bolts to enable the tail ends of the two ejection bolts to be attached to the socket joint part of the first pipeline, so that the installation of the connecting pipe is completed; finally, installing two outer protective pipe pieces on the outer side of the connecting pipe, and connecting the two outer protective pipe pieces to ensure that the inner arc surfaces of the inner ribs are attached to the outer side wall of the connecting pipe, thereby completing the installation of the connecting device;

s5: pipe jacking operation: carrying out pipe jacking operation on the first pipeline and the second pipeline which are provided with the connecting device, so that the connecting device is synchronously jacked with the first pipeline and the second pipeline;

s6: excavation of an inspection well: excavating an inspection well pit at a corresponding position of the pipeline branch section, and cleaning the surrounding soil body after finding a connecting device until the construction requirement of the inspection well is met;

s7: dismantling the connecting device: the method comprises the following steps of firstly removing two outer protective pipe pieces, then removing the connection of the two connecting pipe pieces, then sequentially screwing two ejection bolts, and ejecting the two ejection bolts inwards to drive the inner side wall of a bearing pipe to be separated from an inserting part of a first pipeline, so that the purpose of separating the connecting pipe pieces from the first pipeline is realized, and the removal of a connecting device is completed;

s8: installation of branch pipe fittings: connecting a branch pipe fitting of the pipeline branch section to the right end part of the first pipeline according to the design requirement of the pipeline;

s9: installation of the recovery device: firstly, connecting the left end of the inner sleeve to the right end of the branch pipe fitting through a first connecting mechanism, then adjusting each adjusting bolt, wherein the adjusting bolt rotates to drive the fixing plate to move from left to right, so that the outer sleeve is driven to move rightwards until the right end of the outer sleeve is contacted with the left end of a second pipeline, and finally, connecting the right end of the outer sleeve to the left end of the second pipeline through a second connecting mechanism, so that the installation of the multiple-pass device is completed;

s10: setting of an external functional protection layer of the recovery device: firstly, two first straight duct pieces are sleeved at the right end part of a branch pipe fitting, then two third straight duct pieces are sleeved at the left end part of a second pipeline, then two outer duct pieces are connected, then a functional protection material is filled into an inner cavity of the outer duct through an adhesive injection port to form an annular functional protection layer, and the setting of an external functional protection layer of the recanalization device is completed.

The branch pipe fitting is a three-way joint or a valve.

The first connecting mechanism is a bearing pipe I which is in socket joint with the inserting part of the branch pipe fitting and is integrated with the inner sleeve pipe into a whole; the second connecting mechanism is a plug-in pipe which is connected with the bearing part of the second pipeline in a socket-and-spigot manner and is integrated with the outer sleeve.

The first connecting mechanism and the second connecting mechanism are both vertical flanges.

Two vertically-placed connecting bolts with locking nuts are commonly penetrated through the side walls of the two connecting pipe pieces; the lateral wall of every connection section of jurisdiction is all along vertical inside sunken formation about two countersunk grooves that distribute, and just right from top to bottom in two countersunk grooves of connecting the section of jurisdiction, and the mounting hole of through connection section of jurisdiction inside wall, lateral wall is all seted up to the tank bottom in every countersunk groove, and connecting bolt wears in the mounting hole.

The inner side wall of the outer protective duct piece and one end of the inner side wall of the outer sealing duct piece in the front-back direction are respectively and integrally provided with a transverse convex rib, and the other end of the outer protective duct piece is respectively and integrally provided with a transverse strip-shaped clamping groove matched with the convex rib in a strip-shaped manner; the convex edge strips and the strip-shaped clamping grooves of the two outer sealing duct pieces are arranged in an exchange manner and are mutually matched; the convex edge strips and the strip-shaped clamping grooves of the two outer protective pipe pieces are arranged in an exchange mode and are matched with each other.

In the construction, when the interface types of the first pipeline and the connecting device, the second pipeline and the connecting device, the first pipeline and the branch pipe fitting, the re-circulation device and the branch pipe fitting and the re-circulation device and the second pipeline are not matched, the disk bearing short pipe or the disk plug short pipe is used for conversion.

The splicing mechanism is two integrated limiting inserting strips which are fixed on the tail end face of the connecting pipe and distributed up and down, and the outer surfaces of the two limiting inserting strips are attached to the bearing part of the second pipeline.

The inner sleeve is in a straight pipe shape; the outer sleeve comprises a left straight pipe section and a right straight pipe section which are distributed left and right and are connected into a whole, and the inner diameter of the left straight pipe section is larger than that of the right straight pipe section.

The number of the positioning ear plates is three; the number of the sealing rubber rings positioned between the inner sleeve and the outer sleeve is two; the connecting pipe, the inner sleeve and the outer sleeve are all made of steel; the outer protecting pipe and the outer sealing pipe are both made of hard plastics; the functional protective layer is made of foam sealant.

Compared with the traditional pipe-jacking construction technology, the branch section reservation and recanalization construction method for the long-distance continuous pipe-jacking has the following advantages by adopting a brand new auxiliary device:

firstly, the detachable connecting device is arranged on the branch section of the pipeline, so that long-distance continuous pipe-jacking construction of the pipeline is realized, unnecessary pipe-jacking working pits are reduced, the problem of pipe-jacking intermittent operation is avoided, and the problems of low intermittent pipe-jacking construction efficiency, increased construction cost and fragmented and complicated processes are solved;

secondly, by installing the telescopic re-circulation device, the flexible arrangement of the underground pipeline inspection well is realized, the flexible installation of branch pipe fittings such as a three-way joint, a valve and the like is facilitated, the installation efficiency is effectively improved, and meanwhile, by arranging the sealing rubber ring and the outer sealing pipe, the sealing effect and the corrosion-resistant heat-preservation effect at the joint of the re-circulation device are improved;

thirdly, the construction method realizes the synchronous construction of the pipe jacking pipe and the inspection well, effectively improves the construction efficiency and greatly reduces the construction cost.

The invention designs a brand new construction method, overcomes the problem that the existing pipe jacking process cannot realize long-distance continuous pipe jacking due to the arrangement of branch sections, can ensure the construction quality, can accelerate the construction progress and reduce the construction cost, and has the advantages of convenient operation, labor saving and safety.

Drawings

FIG. 1 is a schematic view of the installation of the connection device of the present invention;

FIG. 2 is a schematic view of the installation of the recanalization device of the present invention;

FIG. 3 is a schematic view of the construction of the connecting device of the present invention;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 3;

FIG. 6 is an enlarged partial schematic view at G of FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along line C-C of FIG. 3;

FIG. 8 is a schematic structural view of a recanalization device according to the present invention;

FIG. 9 is a schematic cross-sectional view taken along line D-D of FIG. 8;

FIG. 10 is a schematic cross-sectional view taken along line E-E of FIG. 8;

FIG. 11 is a schematic view of the construction of the shuttle with flange;

FIG. 12 is a schematic view of the structure of the outer tube of the present invention;

FIG. 13 is a schematic cross-sectional view taken along line F-F of FIG. 12;

FIG. 14 is an enlarged partial schematic view at H of FIG. 13;

FIG. 15 is a schematic view of the construction of the disk-shaped short-receiving tube and the disk-shaped short-insertion tube of the present invention.

In the figure, 101-bearing pipe, 102-ejector bolt, 103-connecting pipe piece, 104-outer protective pipe piece, 105-inner rib, 106-locking nut, 107-connecting bolt, 108-countersunk groove, 109-limiting insert, 2-first pipeline, 3-second pipeline, 4-branch pipe, 501-inner sleeve, 502-outer sleeve, 503-sealing rubber ring, 504-positioning lug plate, 505-baffle, 506-adjusting bolt, 507-fixing plate, 508-bearing pipe I, 509-insert pipe, 510-flange plate, 6-outer sealing pipe piece, 601-first straight pipe piece, 602-first transition pipe piece, 603-second straight pipe piece, 604-second transition pipe piece, 605-third straight pipe piece, 7-glue injection port, 8-functional protective layer, 9-convex rib, 10-strip clamping groove, 11-coil short bearing pipe and 12-coil short inserting pipe.

Detailed Description

A branch section reservation and recanalization construction method for long-distance continuous jacking pipes comprises the following steps:

s1: prefabrication of the connecting device: the connecting device comprises a connecting pipe, a socket pipe 101 is arranged at the head end of the connecting pipe, an inserting mechanism is arranged at the tail end of the connecting pipe, two ejection bolts 102 which are oppositely arranged up and down penetrate through the outer side wall of the socket pipe 101, and the tail ends of the two ejection bolts 102 face inwards; the connecting pipe is composed of two arc-shaped connecting pipe pieces 103 which are distributed up and down, and the two connecting pipe pieces 103 are detachably connected; an outer protecting pipe is sleeved outside the connecting pipe; the outer diameter of the outer protecting pipe is consistent with the outer diameter of the first pipeline 2, and the length of the outer protecting pipe is consistent with that of the connecting pipe; the outer protective pipe is composed of two arc-shaped outer protective pipe pieces 104 which are distributed up and down, and the two outer protective pipe pieces 104 are detachably connected; a plurality of arc-shaped inner ribs 105 which are distributed in parallel from left to right are fixed on the inner side wall of each outer protective duct piece 104;

s2: prefabricating a recanalization device: the recanalization device comprises an inner sleeve 501 and an outer sleeve 502, the right part of the inner sleeve 501 penetrates the left part of the outer sleeve 502, and a plurality of sealing rubber rings 503 which are distributed left and right are arranged at the joint part of the inner sleeve 501 and the outer sleeve 502; a plurality of positioning ear plates 504 which are distributed equidistantly along the circumferential direction and are vertical in the longitudinal direction are fixed at the left part of the outer side wall of the inner sleeve 501; the left side of each positioning ear plate 504 is provided with a baffle plate 505 which is arranged in parallel with the positioning ear plate and is fixed on the outer side wall of the inner sleeve 501; each positioning ear plate 504 is provided with an adjusting bolt 506 which is positioned at the right side of the baffle 505 and is transversely arranged; a plurality of fixing plates 507 which are opposite to the positioning ear plates 504 one by one and provided with screw holes are fixed at the right part of the outer side wall of the outer sleeve 502, and the tail parts of the adjusting bolts 506 are screwed in the screw holes of the fixing plates 507 one by one; the left end of the inner sleeve 501 is provided with a first connecting mechanism; the right end of the outer sleeve 502 is provided with a second connecting mechanism;

s3: prefabricating an outer sealing pipe: the outer sealing pipe is composed of two arc-shaped outer sealing pipe pieces 6 which are distributed up and down, and the two outer sealing pipe pieces 6 are detachably connected; the outer duct piece 6 comprises a first straight duct piece 601, a first transition duct piece 602, a second straight duct piece 603, a second transition duct piece 604 and a third straight duct piece 605 which are sequentially connected into a whole from left to right; the inner diameter of the first straight segment 601 and the inner diameter of the third straight segment 605 are both smaller than the inner diameter of the second straight segment 603; glue injection ports 7 are formed in the side wall of the first transition duct piece 602 and the side wall of the second transition duct piece 604;

s4: installation of the connecting device: according to the design requirement of the pipeline, the connecting device is installed at the branch section of the pipeline, and the installation process comprises the following steps: firstly, placing a connecting pipe between a first pipeline 2 and a second pipeline 3, carrying out socket joint connection on the tail end of the connecting pipe and a bearing part of the second pipeline 3 through a socket joint mechanism, carrying out socket joint connection on the bearing pipe and a socket joint part of the first pipeline 2, and then screwing two ejector bolts 102 to ensure that the tail ends of the two ejector bolts 102 are both attached to the socket joint part of the first pipeline 2, thereby completing the installation of the connecting pipe; finally, two outer protecting pipe pieces 104 are arranged on the outer side of the connecting pipe and connected with the two outer protecting pipe pieces 104, so that the inner arc surfaces of the inner ribs 105 are attached to the outer side wall of the connecting pipe, and the installation of the connecting device is completed;

s5: pipe jacking operation: performing pipe jacking operation on the first pipeline 2 and the second pipeline 3 provided with the connecting device, and synchronously jacking the connecting device, the first pipeline 2 and the second pipeline 3;

s6: excavation of an inspection well: excavating an inspection well pit at a corresponding position of the pipeline branch section, and cleaning the surrounding soil body after finding a connecting device until the construction requirement of the inspection well is met;

s7: dismantling the connecting device: firstly, removing two outer protective pipe pieces 104, then removing the connection of two connecting pipe pieces 103, then sequentially screwing two ejection bolts 102, and ejecting the two ejection bolts 102 inwards to drive the inner side wall of the bearing pipe 101 to be separated from the inserting part of the first pipeline 2, so that the purpose of separating the connecting pipe pieces 103 from the first pipeline 2 is realized, and the removal of the connecting device is completed;

s8: installation of the branch pipe fitting 4: connecting a branch pipe fitting 4 of the pipeline branch section to the right end part of the first pipeline 2 according to the pipeline design requirement;

s9: installation of the recovery device: firstly, the left end of the inner sleeve 501 is connected to the right end of the branch pipe fitting 4 through a first connecting mechanism, then each adjusting bolt 506 is adjusted, the adjusting bolt 506 rotates to drive the fixing plate 507 to move from left to right, so that the outer sleeve 502 is driven to move rightwards until the right end of the outer sleeve 502 is contacted with the left end of the second pipeline 3, and finally the right end of the outer sleeve 502 is connected to the left end of the second pipeline 3 through a second connecting mechanism, so that the installation of the multi-pass device is completed;

s10: setting of the external functional protection layer 8 of the recanalization device: firstly, two first straight pipe pieces 601 are sleeved at the right end part of a branch pipe fitting 4, then two third straight pipe pieces 605 are sleeved at the left end part of a second pipeline 3, then two outer sealing pipe pieces 6 are connected, and then a function protection material is filled into the inner cavity of the outer sealing pipe through a glue injection port 7 to form an annular function protection layer 8, so that the setting of the external function protection layer 8 of the recanalization device is completed.

The branch pipe fitting 4 is a three-way joint or a valve.

The first connecting mechanism is a bearing pipe I508 which is connected with the inserting part of the branch pipe fitting 4 in a socket-and-spigot manner and is integrated with the inner sleeve 501; the second connecting mechanism is a plug pipe 509 which is socket-connected with the socket part of the second pipeline 3 and is integrated with the outer sleeve 502.

The first connecting mechanism and the second connecting mechanism are both vertical flanges 510.

Two vertically-placed connecting bolts 107 with locking nuts 106 are commonly penetrated through the side walls of the two connecting pipe pieces 103; the lateral wall of every connection section of jurisdiction 103 all forms two countersunk grooves 108 that control the distribution along vertical inside sunken, and two countersunk grooves 108 of connecting section of jurisdiction 103 just right from top to bottom, and the mounting hole of through connection section of jurisdiction 103 inside wall, lateral wall is all seted up to the tank bottom of every countersunk groove 108, and connecting bolt 107 wears in the mounting hole.

One end of the inner side wall of the outer protecting duct piece 104 and one end of the inner side wall of the outer sealing duct piece 6 in the front-back direction are both integrally provided with a rib strip 9 which is transversely arranged, and the other end of the inner side wall is integrally provided with a strip-shaped clamping groove 10 which is transversely arranged and matched with the rib strip 9 in shape; the rib strips 9 and the strip-shaped clamping grooves 10 of the two outer sealing pipe pieces 6 are arranged in an exchange way and are matched with each other; the bead strips 9 and the strip-shaped clamping grooves 10 of the two outer protective pipe sheets 104 are arranged in an exchangeable manner and are matched with each other.

In the construction, when the connection types of the first pipeline 2 and the connecting device, the second pipeline 3 and the connecting device, the first pipeline 2 and the branch pipe fitting 4, the communicating device and the branch pipe fitting 4 and the communicating device and the second pipeline 3 are not matched, the disk bearing short pipe 11 or the disk inserting short pipe 12 is used for conversion.

The plug-in mechanism is two spacing slips 109 that are fixed in the tail end face of connecting pipe and distribute from top to bottom as an organic whole, and the surface of two spacing slips 109 all laminates in the portion of accepting of second pipeline 3.

The inner sleeve 501 is in a straight pipe shape; the outer sleeve 502 comprises a left straight pipe section and a right straight pipe section which are distributed left and right and are connected into a whole, and the inner diameter of the left straight pipe section is larger than that of the right straight pipe section.

The number of the positioning ear plates 504 is three; the number of the sealing rubber rings 503 positioned between the inner sleeve 501 and the outer sleeve 502 is two; the connecting pipe, the inner sleeve 501 and the outer sleeve 502 are all made of steel; the outer protecting pipe and the outer sealing pipe are both made of hard plastics; the functional protective layer 8 is made of a foam sealant.

The left part of the screw section of the adjusting bolt 506 is of a smooth structure, and the right part of the screw section is of a threaded structure.