Large-diameter pipe jacking construction device and method for crossing loose backfill soil layer

Abstract

This application relates to the technical field of pipe jacking construction, and discloses a large-diameter pipe jacking construction device and method for traversing loose backfilled soil layers. The construction device is installed in a foundation pit and includes two slide rails and a jacking device, as well as a lifting device and a transfer platform. The lifting device has two rotating rods rotatably mounted between the two slide rails, and a drive source for driving the rotating rods to rotate. The length direction of the rotating rods is parallel to the length direction of the slide rails. At least two extension rods are provided on the side wall of each rotating rod, and the extension rods on different rotating rods correspond to form a cross structure. The space above the extension rods forms a placement space, and the slide rails have slots for accommodating the extension rods. This application facilitates the disassembly of the slings after the pipe is hoisted.

Description

Technical Field

[0001] This application relates to the technical field of pipe jacking construction, and in particular to a large-diameter pipe jacking construction device and method for traversing loose backfilled soil layers. Background Technology

[0002] Pipe jacking is a pipeline laying technology that requires little or no excavation. In the foundation pit, the jacking force generated by the jacking equipment overcomes the friction between the pipeline and the surrounding soil, and pushes the pipeline into the soil according to the design requirements. During the jacking process, the tunneling equipment at the end continuously excavates the soil and removes the soil from the pipeline, so that the pipeline can be continuously pushed into the soil layer.

[0003] The existing patent application with application number 202310466992.6 discloses a pipe jacking construction method for traversing loose backfill soil layers. In this scheme, the loose backfill soil layers are first pre-reinforced so that the soil around the pipe and the soil above it forms a tight solid body, and then the manual tunneling pipe jacking method is used for construction.

[0004] In tunnel boring machine (TBM) construction, a foundation pit must first be excavated. Then, the bottom and backwall are poured within the pit, and two guide rails are installed on the bottom surface before the jacking device is installed. During construction, the jacking device pushes the pipe forward, driving the tunneling equipment. The jacking device is then retracted, and a new section of pipe is placed on the guide rails, and the jacking process continues, inserting the pipe section by section into the soil. Because large-diameter TBMs typically have significant mass, they are usually hoisted onto the guide rails using slings. To minimize damage to the pipe's end face, the slings are usually secured to the outer wall of the pipe rather than passing through it, making the removal of the slings from the guide rails rather cumbersome. Summary of the Invention

[0005] Firstly, in order to facilitate the disassembly of the slings, this application provides a large-diameter pipe jacking construction device for traversing loose backfill soil layers.

[0006] The technical solution adopted in this application is as follows:

[0007] A large-diameter pipe jacking construction device for traversing loose backfilled soil layers is installed in a foundation pit. It includes two slide rails and a jacking device, as well as a lifting device and a transfer platform. The lifting device has two rotating rods rotatably mounted between the two slide rails, and a drive source for rotating the rotating rods. The length direction of the rotating rods is parallel to the length direction of the slide rails. At least two extension rods are provided on the side walls of the rotating rods, with the extension rods on different rotating rods corresponding to each other to form a cross structure. The space above the extension rods forms a placement space, and the slide rails have slots for accommodating the extension rods. The pipe is hoisted onto the transfer platform and then placed into the placement space via the transfer platform. When the two rotating rods rotate towards each other, the placement space gradually descends, allowing the pipe to be placed on the slide rails.

[0008] By adopting the above technical solution, the pipeline is first placed on the transfer platform, and then the transfer platform is driven to rotate by the drive source, so that the pipeline is located in the placement space. The pipeline is supported by two sets of intersecting extension rods, which makes it easy to disassemble the slings. Then the rotating rods rotate in opposite directions, so that the placement space gradually moves downward until the pipeline abuts against the slide rail, thus completing the placement of the pipeline.

[0009] Optionally, the transfer platform includes a rotating plate rotatably mounted on the inner wall of the pit, a power source for driving the rotating plate to rotate, a sliding plate slidably mounted on the rotating plate, and a first element mounted on the rotating plate for driving the sliding plate to slide. The sliding plate has an opening for the extension rod to pass through, and a baffle is rotatably connected to one end of the sliding plate away from the rotating plate. Two baffles are provided and located on both sides of the opening. A second element for driving the baffle to rotate is installed on the sliding plate. When the jacking pipe is placed on the sliding plate, the baffle is used to restrict the pipe from sliding out of the sliding plate. When the pipe is placed in the placement space, the second element drives the baffle to rotate until it is flush with the surface of the sliding plate, and the first element drives the sliding plate to slide in the direction of the rotating plate.

[0010] By adopting the above technical solution, the pipe is placed on the sliding plate and positioned by the baffle. The sliding plate slides to the top of the placement space, and the rotating plate rotates downward, so that the pipe can be placed in the placement space. This makes the pipe less likely to shake or be damaged during the whole process.

[0011] Optionally, a support frame extending into the opening is mounted on the sliding plate, and multiple rotating rollers are rotatably connected to the support frame. A third element for driving all the rotating rollers to rotate synchronously is mounted on the sliding plate. There is a gap between the rotating rollers and the inner wall of the opening to allow the extension rod to pass through. When the pipe is placed on the sliding plate, the rotation of the rotating rollers can adjust the position of the pipe on the sliding plate.

[0012] By adopting the above technical solution, when the pipe is placed on the sliding plate, the position of the pipe can be adjusted by rotating the roller, so that the pipe can be placed more accurately in the placement space.

[0013] Optionally, the third element includes a drive motor connected to one of the rotating rollers and a timing belt connecting all the rotating rollers together.

[0014] By adopting the above technical solution, the drive motor drives the rotating rollers to rotate, which means that all the rotating rollers can be driven to rotate synchronously under the action of the synchronous belt.

[0015] Optionally, the sliding plate has an installation groove, and a fixed cylinder is installed on the inner wall of the installation groove. A connecting cylinder is installed at the end of the baffle. The connecting cylinder is rotatably installed on the outer wall of the fixed cylinder. The second element includes a rack slidably installed on the lower surface of the sliding plate and a telescopic source for driving the rack to slide. The outer wall of the connecting cylinder is provided with teeth at intervals, and the teeth mesh with the rack.

[0016] By adopting the above technical solution, the rack can drive the baffle to rotate by sliding, thanks to the cooperation of the teeth on the outer wall of the rack and the connecting cylinder. The baffle is easy to adjust.

[0017] Optionally, the fixed cylinder has a hollow structure, and a plug is slidably inserted into the fixed cylinder. The plug can be inserted into the support frame. The connecting cylinder and the plug are linked. When the baffle rotates to be flush with the surface of the sliding plate, the plug can slide out from the support frame and be stored in the fixed cylinder.

[0018] By adopting the above technical solution, a plug-in column slides in the fixed cylinder. When the plug-in column is inserted into the support frame, it improves the support effect on the support frame, making the rotation roller more stable when driving the pipeline, and also improving the support effect on the pipeline. When the baffle rotates, the plug-in column can slide out of the support frame, so that the sliding plate can slide normally into the lower surface of the rotating plate.

[0019] Optionally, the outer wall of the plug-in post is provided with a protruding post, the outer wall of the fixing cylinder is provided with a relief groove, the protruding post passes through the relief groove, and the relief groove extends along the axial direction of the fixing cylinder. The inner wall of the connecting cylinder is provided with an inclined groove, and the end of the protruding post extends into the inclined groove. When the connecting cylinder rotates, the protruding post is pressed against the inner wall of the inclined groove and can slide in the relief groove.

[0020] By adopting the above technical solution, the sliding of the plug-in post can be achieved with the cooperation of the protruding post and the inclined groove.

[0021] Optionally, a guide structure is provided between the sliding plate and the rotating plate. The first element includes a lead screw that rotates on the lower surface of the rotating plate and a power motor for driving the lead screw to rotate. The lead screw and the sliding plate are threadedly connected.

[0022] Optionally, the drive source includes a worm gear rotatably connected between the slide rails, and each of the rotating rods is provided with a worm wheel on its outer wall, the worm wheel meshing with the worm gear.

[0023] By adopting the above technical solution, the rotation of the rotating rod is more stable with the cooperation of the worm gear and worm, and it also has a counter-rotation effect.

[0024] Secondly, this application provides a method for constructing large-diameter pipe jacking.

[0025] A method for constructing large-diameter pipe jacking includes the following steps;

[0026] (1) Excavate the foundation pit and pour the bottom and back wall of the foundation pit;

[0027] (2) Install the pipe jacking construction device in the above scheme in the foundation pit, and install the jacking equipment on one side of the back wall;

[0028] (3) Hoist the pipe onto the rotating platform, then rotate the rotating platform to transport the pipe to the placement space. Then remove the slings, drive the rotating rod to rotate in opposite directions, so that the placement space gradually moves downward and the pipe is placed on the slide rail. Use the jacking equipment to jack the pipe into the soil.

[0029] In summary, this application includes at least one of the following beneficial effects:

[0030] 1. The pipe is placed in the placement space via a rotating platform, which allows the pipe to be hoisted and placed on the rotating platform first, making the placement of the pipe convenient. With the support of the extension rod, it is also convenient to disassemble the sling.

[0031] 2. When the baffle rotates, the plug can be inserted into the support frame, improving the stability of the support frame. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure used in the embodiments of this application;

[0033] Figure 2 This is a structural schematic diagram of an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the lifting device in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the transfer platform in the embodiments of this application;

[0036] Figure 5 This is a bottom view of the transfer platform in the embodiments of this application;

[0037] Figure 6 This is an exploded view of the baffle in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram illustrating the inclined groove in an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Excavation pit; 2. Slide rail; 3. Jacking equipment; 4. Lifting device; 41. Rotating rod; 42. Extension rod; 43. Drive source; 431. Worm gear; 432. Worm wheel; 5. Transfer platform; 51. Rotating plate; 52. Sliding plate; 53. Baffle; 54. Power source; 55. First element; 551. Lead screw; 552. Power motor; 6. Placement space; 7. Slot; 8. Opening; 9. Second element; 91. Rack; 92. Telescopic source; 10. Support frame; 11. Third element; 111. Drive motor; 112. Synchronous belt; 113. Pressure rod; 12. Mounting slot; 13. Fixing cylinder; 14. Connecting cylinder; 15. Tooth; 16. Insertion column; 17. Protruding column; 18. Relief slot; 19. Inclined slot. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0041] Example 1

[0042] This application discloses a large-diameter pipe jacking construction device for traversing loose backfilled soil layers. (Refer to...) Figure 1 and Figure 2The construction equipment is installed in the foundation pit 1, and then the pipe jacking construction is carried out. The construction equipment includes two slide rails 2, a jacking device 3, a lifting device 4, and a transfer platform 5. After the foundation pit 1 is excavated, the side walls of the bottom surface of the foundation pit 1 are poured to ensure the stability of the equipment after installation. The two slide rails 2 are fixed to the bottom surface of the foundation pit 1 by bolts, and the two slide rails 2 are parallel to each other. The jacking device 3 is preferably composed of two hydraulic cylinders. A back wall is poured on the inner wall of the foundation pit 1, and the jacking device 3 is installed on one side of the back wall. The pipe is placed on the slide rails 2, and then the jacking device 3 pushes the pipe to achieve the effect of pipe jacking.

[0043] Reference Figure 2 and Figure 3 The lifting device 4 includes two rotating rods 41 rotatably mounted between two slide rails 2, and a drive source 43 for driving the rotating rods 41 to rotate. The rotating rods 41 are mounted on the bottom surface of the pit 1 via bearing seats, and the two rotating rods 41 and the two slide rails 2 are parallel to each other. An extension rod 42 is fixed on the outer wall of each of the two rotating rods 41. In this embodiment, two extension rods 41 are fixed on the outer wall of each rotating rod 41. The extension rods 42 on the two rotating rods 41 correspond to each other, so that the extension rods 42 form a cross structure. A placement space 6 for placing pipes can be formed above the extension rods 42. As the rotating rods 41 continue to rotate relative to each other, the placement space 6 can gradually move downward. The slide rails 2 are provided with slots 7 for accommodating the extension rods 42, so that when the extension rods 42 move downward, the pipe can finally be placed on the slide rails 2, and the extension rods 42 are stored in the slots 7.

[0044] Furthermore, the drive source 43 includes a worm gear 431 rotatably mounted on the bottom surface of the pit 1. The worm gear 431 is mounted on the bottom surface of the pit 1 via a bearing seat and is driven by a motor. Each end of the rotating rod 41 is coaxially fixed with a worm wheel 432, the two worm wheels 432 having opposite helical directions. The worm gear 431 has two helical portions, corresponding one-to-one with the two worm wheels 432. When the worm gear 431 rotates, it can drive the two rotating rods 41 to rotate in opposite directions. In other embodiments, the rotating rods 41 can also be driven to rotate one-to-one by a motor or other means.

[0045] Reference Figure 2 Since directly hoisting the pipe onto the placement space 6 could easily damage the extension rod 42 due to pipe swaying during hoisting, the pipe can be first hoisted onto the transfer platform 5, and then placed onto the placement space 6 via the transfer platform 5.

[0046] Reference Figure 4 and Figure 5The transfer platform 5 includes a rotating plate 51, a power source 54 for driving the rotating plate 51 to rotate, a sliding plate 52 slidably mounted on the rotating plate 51, and a first element 55 mounted on the rotating plate 51 for driving the sliding plate 52 to slide. The upper end of the rotating plate 51 is rotatably mounted on the inner wall of the pit 1 via a hinge seat. The power source 54 is a hydraulic cylinder or oil cylinder, with the lower end of the cylinder barrel hinged to the inner wall of the pit 1 and the end of the piston rod hinged to the side wall of the rotating plate 51. Preferably, there are two power sources 54 symmetrically arranged on both sides of the rotating plate 51. The rotating plate 51 can be driven to rotate by the power source 54.

[0047] A sliding plate 52 is slidably mounted on the lower surface of a rotating plate 51, with one end of the sliding plate 52 extending beyond the side wall of the rotating plate 51. A baffle 53 is mounted on the end of the sliding plate 52 extending beyond the rotating plate 51, and an opening 8 is provided on the sliding plate 52, forming a space for the extension rod 42 to pass through. Two baffles 53 are provided, symmetrically located on both sides of the opening 8. The pipe is first suspended on the rotating plate 51, and the baffle 53 can block the pipe, making it difficult for the pipe to roll off the rotating plate 51. The first element 55 drives the sliding plate 52 to slide away from the rotating plate 51, and the rotating plate 51 also gradually tilts and rotates downward, allowing the pipe to move above the placement space 6. The rotating plate 51 continues to rotate downward, and the extension rod 42 passes through the opening 8, allowing the pipe to be placed on the placement space 6. The baffle 53 is rotatably mounted on the sliding plate 52, and a second element 9 for driving the rotation of the baffle 53 is mounted on the sliding plate 52. After the pipe is placed, the second element 9 drives the baffle 53 to rotate until it is flush with the surface of the sliding plate 52. Then, the first element 55 drives the sliding plate 52 to slide towards the rotating plate 51, so that the sliding plate 52 is housed on the lower surface of the rotating plate 51. The rotating plate 51 continues to rotate towards the inner wall of the pit 1, so that the sliding plate 52 does not affect the subsequent jacking of the pipe.

[0048] A guide structure is provided between the rotating plate 51 and the sliding plate 52, allowing the sliding plate 52 to slide stably on the rotating plate 51. Preferably, a guide groove is formed on the lower surface of the rotating plate 51, and a guide block is fixed to the surface of the sliding plate 52, achieving guidance through the groove block. The cross-section of the guide groove can be trapezoidal or T-shaped, and two guide grooves can be provided, with the guide block corresponding to the guide groove, thereby improving the stability of the sliding plate 52.

[0049] Reference Figure 5 The first element 55 includes a lead screw 551 rotatably mounted on the lower surface of the rotating plate 51, and a power motor 552 connected to the lead screw 551. The first element 55 can be provided in two sets, with the lead screw 551 threadedly connected to the sliding plate 52. The two lead screws 551 rotate synchronously, thereby driving the sliding plate 52 to slide.

[0050] Reference Figure 6 In a further embodiment, the sliding plate 52 has a mounting groove 12, and a fixing cylinder 13 is fixed on the inner wall of the mounting groove 12. A connecting cylinder 14 is fixed to one end of the baffle 53, and the connecting cylinder 14 is sleeved on the outer wall of the fixing cylinder 13, thereby realizing the rotational connection of the baffle 53. The second element 9 includes a rack 91 slidably mounted on the lower surface of the sliding plate 52 and a telescopic source 92 for driving the rack 91 to slide. The telescopic source 92 can be an electric telescopic cylinder, a lead screw 551 transmission, a hydraulic cylinder, etc. to drive the rack 91 to slide back and forth. Teeth 15 are spaced apart on the outer wall of the connecting cylinder 14, and the teeth 15 mesh with the rack 91. By driving the rack 91 to slide through the telescopic source 92, the rotation of the baffle 53 can be controlled.

[0051] Furthermore, a support frame 10 is fixed on the sliding plate 52, extending into the opening 8. Multiple rotating rollers are rotatably mounted on the support frame 10; in this embodiment, three rotating rollers are provided, and there is a gap between the rotating rollers and the inner wall of the opening 8 to allow the extension rod 42 to pass through. A third element 11 for driving the rotating rollers to rotate is also mounted on the sliding plate 52. When the pipe is placed on the sliding plate 52, the position of the pipe can be adjusted by rotating the rollers, allowing the pipe to better correspond to the position of the placement space 6.

[0052] A synchronous belt 112 connects adjacent rotating rollers. The third element 11 includes a drive motor 111 connected to one of the rotating rollers, thereby driving one of the rotating rollers to rotate. The other rotating rollers also rotate synchronously under the action of the synchronous belt 112. A pressure bar 113 is also installed on the support frame 10 at a position between two adjacent rotating rollers. The pressure bar 113 is arranged vertically, and the synchronous belt 112 is wound around the pressure bar 113, thereby increasing the contact area between the synchronous belt 112 and the rotating rollers and improving the synchronization effect.

[0053] Reference Figure 6 and Figure 7 In a further embodiment, the fixing cylinder 13 has an internal hollow structure, and the opening 8 of the fixing cylinder 13 extends to the inner wall of the opening 8. A plug-in post 16 is slidably installed inside the fixing cylinder 13. The connecting cylinder 14 and the plug-in post 16 are linked. The side wall of the support frame 10 has a corresponding insertion hole in the fixing cylinder 13. When the baffle 53 rotates to a position that blocks the pipe, the plug-in post 16 slides out of the fixing cylinder 13 and can be inserted into the side wall of the support frame 10, thereby improving the stability of the support frame 10. After the pipe is placed in the placement space 6, the baffle 53 rotates to be flush with the surface of the sliding plate 52, at which point the plug-in post 16 can be stored in the fixing cylinder 13.

[0054] A protruding post 17 is fixed to the outer wall of the plug-in post 16, and a relief groove 18 is provided on the side wall of the fixing cylinder 13, extending along the axial direction of the fixing cylinder 13. When the plug-in post 16 slides in the fixing cylinder 13, the protruding post 17 slides in the relief groove 18. The upper end of the protruding post 17 extends beyond the surface of the fixing cylinder 13, and an inclined groove 19 is provided on the inner wall of the connecting cylinder 14, with the upper end of the protruding post 17 extending into the inclined groove 19. When the connecting cylinder 14 rotates, the protruding post 17 is pressed against the inner wall of the inclined groove 19, thereby realizing the sliding of the plug-in post 16.

[0055] The implementation principle of a large-diameter pipe jacking construction device for traversing loose backfilled soil layers according to an embodiment of this application is as follows: the sliding plate 52 slides, the pipe is first hoisted onto the sliding plate 52, and then the pipe is adjusted to a suitable position by the rotating roller. The rotating plate 51 rotates downward so that the pipe can be gradually placed on the placement space 6. After the pipe is placed on the extension rod 42, the baffle 53 rotates downward, and then the sliding plate 52 slides and is stored on the lower surface of the rotating plate 51. The rotating plate 51 continues to rotate so that the baffle 53 and the sliding plate 52 do not interfere with the subsequent pipe jacking operation.

[0056] Example 2

[0057] This embodiment discloses a method for constructing large-diameter pipe jacking, using the apparatus in Embodiment 1, including the following steps;

[0058] (1) Excavate the foundation pit 1 and pour the bottom surface and back wall of the foundation pit 1;

[0059] (2) The pipe jacking construction device of Example 1 is installed in the foundation pit 1, and the jacking equipment 3 is installed on one side of the back wall;

[0060] (3) Hoist the pipe onto the rotating platform, then rotate the rotating platform to transport the pipe to the placement space 6. Then remove the slings and drive the rotating rod 41 to rotate in opposite directions, so that the placement space 6 gradually moves downward and the pipe is placed on the slide rail 2. Use the jacking device 3 to jack the pipe into the soil.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-diameter pipe jacking construction device for traversing loose backfilled soil layers, installed in a foundation pit (1), comprising two slide rails (2) and jacking equipment (3), characterized in that: It also includes a lifting device (4) and a transfer platform (5); the lifting device (4) includes two rotating rods (41) rotatably mounted between the two slide rails (2), and a drive source (43) for driving the rotating rods (41) to rotate. The length direction of the rotating rods (41) is parallel to the length direction of the slide rails (2); at least two extension rods (42) are provided on the side wall of the rotating rods (41). The extension rods (42) on different rotating rods (41) correspond to each other to form a cross structure. The space above the extension rods (42) forms a placement space (6). The slide rails (2) are provided with slots (7) for accommodating the extension rods (42); the pipe is hoisted on the transfer platform (5) and then placed in the placement space (6) through the transfer platform (5). When the two rotating rods (41) rotate towards each other, the placement space (6) can gradually move downward so that the pipe is placed on the slide rails (2); The transfer platform (5) includes a rotating plate (51) rotatably mounted on the inner wall of the pit (1), a power source (54) for driving the rotating plate (51) to rotate, a sliding plate (52) slidably mounted on the rotating plate (51), and a first element (55) mounted on the rotating plate (51) for driving the sliding plate (52) to slide; the sliding plate (52) has an opening (8) for the extension rod (42) to pass through, and a baffle (53) is rotatably connected to one end of the sliding plate (52) away from the rotating plate (51). Two baffles (53) are provided and located on both sides of the opening (8); a second element (9) for driving the baffle (53) to rotate is installed on the sliding plate (52). When the top pipe is placed on the sliding plate (52), the baffle (53) is used to restrict the pipe from sliding out of the sliding plate (52). After the pipe is placed in the placement space (6), the second element (9) drives the baffle (53) to rotate to be flush with the surface of the sliding plate (52), and the first element (55) drives the sliding plate (52) to slide in the direction of the rotating plate (51).

2. The large-diameter pipe jacking construction device for traversing loose backfilled soil strata according to claim 1, characterized in that: A support frame (10) extending into the opening (8) is mounted on the sliding plate (52). Multiple rotating rollers are rotatably connected to the support frame (10). A third element (11) for driving all the rotating rollers to rotate synchronously is mounted on the sliding plate (52). There is a gap between the rotating rollers and the inner wall of the opening (8) to allow the extension rod (42) to pass through. When the pipe is placed on the sliding plate (52), the rotation of the rotating rollers can adjust the position of the pipe on the sliding plate (52).

3. The large-diameter pipe jacking construction device for traversing loose backfill soil strata according to claim 2, characterized in that: The third element (11) includes a drive motor (111) connected to one of the rotating rollers and a timing belt (112) connecting all the rotating rollers together.

4. The large-diameter pipe jacking construction device for traversing loose backfill soil strata according to claim 3, characterized in that: The sliding plate (52) has an installation groove (12), and a fixed cylinder (13) is installed on the inner wall of the installation groove (12). A connecting cylinder (14) is installed at the end of the baffle (53). The connecting cylinder (14) is rotatably installed on the outer wall of the fixed cylinder (13). The second element (9) includes a rack (91) slidably installed on the lower surface of the sliding plate (52) and a telescopic source (92) for driving the rack (91) to slide. The outer wall of the connecting cylinder (14) is provided with teeth (15) at intervals, and the teeth (15) and the rack (91) mesh with each other.

5. A large-diameter pipe jacking construction device for traversing loose backfilled soil strata according to claim 4, characterized in that: The fixed cylinder (13) is a hollow structure, and a plug-in post (16) is slidably inserted into the fixed cylinder (13). The plug-in post (16) can be inserted into the support frame (10). The connecting cylinder (14) and the plug-in post (16) are linked together. When the baffle (53) rotates to be flush with the surface of the sliding plate (52), the plug-in post (16) can slide out from the support frame (10) and be stored in the fixed cylinder (13).

6. A large-diameter pipe jacking construction device for traversing loose backfilled soil strata according to claim 5, characterized in that: The outer wall of the plug-in post (16) is provided with a protruding post (17), and the outer wall of the fixed cylinder (13) is provided with a relief groove (18). The protruding post (17) passes through the relief groove (18), and the relief groove (18) extends along the axial direction of the fixed cylinder (13). The inner wall of the connecting cylinder (14) is provided with an inclined groove (19). The end of the protruding post (17) extends into the inclined groove (19). When the connecting cylinder (14) rotates, the protruding post (17) is pressed against the inner wall of the inclined groove (19) and can slide in the relief groove (18).

7. A large-diameter pipe jacking construction device for traversing loose backfilled soil strata according to claim 6, characterized in that: A guide structure is provided between the sliding plate (52) and the rotating plate (51). The first element (55) includes a lead screw (551) that rotates on the lower surface of the rotating plate (51) and a power motor (552) for driving the lead screw (551) to rotate. The lead screw (551) and the sliding plate (52) are threadedly connected.

8. A large-diameter pipe jacking construction device for traversing loose backfilled soil strata according to any one of claims 1-7, characterized in that: The drive source (43) includes a worm (431) rotatably connected between the slide rails (2), and a worm wheel (432) is provided on the outer wall of the rotating rod (41), and the worm wheel (432) meshes with the worm (431).

9. A method for constructing large-diameter pipe jacking, characterized in that: Includes the following steps; Step 1: Excavate the foundation pit (1) and pour the bottom surface and back wall of the foundation pit (1); Step 2: Install the pipe jacking construction device according to any one of claims 1-7 in the foundation pit (1), and install the jacking equipment (3) on one side of the back wall; Step 3: Hoist the pipe onto the transfer platform (5), then rotate the transfer platform (5) to transport the pipe to the placement space (6), then remove the slings, drive the rotating rod (41) to rotate in opposite directions, so that the placement space (6) gradually moves downward and the pipe is placed on the slide rail (2), and activate the jacking device (3) to jack the pipe into the soil.

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