A top-pipe built-in type turnover retreat-stop device and method

Abstract

The application relates to the technical field of tunnel construction, in particular to an inner-embedded pipe-jacking turnover anti-retreating device and method. The anti-retreating device comprises a working well, a backrest, a pipe joint, a jacking cylinder group, a fixing frame and a longitudinal support beam. The backrest is fixedly installed in the working well. The jacking cylinder group is fixedly installed on the backrest and used for jacking construction of the pipe joint. The pipe joint is unidirectionally slidably connected with the fixing frame, and the longitudinal support beam is detachably clamped between the backrest and the fixing frame. The anti-retreating method utilizes the unidirectional sliding connection between the fixing frame and the slide rail, and through the clamping action of the longitudinal support beam, the fixing frame can be kept unmoved during the jacking construction, the backward force of the pipe joint can be offset after the jacking cylinder group is retracted, the anti-retreating effect can be ensured, repeated disassembly and assembly of the fixing frame can be avoided, the efficiency of the pipe jacking construction is improved, and the labor cost of the pipe jacking construction is reduced.

Description

Technical Field

[0001] This application relates to the field of tunnel construction technology, and in particular to a reusable anti-backward device and method for pipe jacking. Background Technology

[0002] Pipe jacking is a trenchless construction method used when tunnels or underground pipelines cross various obstacles such as railways, roads, rivers, or buildings. During construction, the jacking force of the main hydraulic cylinder pushes the jacking iron, which in turn propels the pipe jacking machine to cut through the soil in front. The soil is then removed by a soil removal device, allowing the pipe sections to advance continuously until the jacking section is completed and the tunnel is formed. In recent years, pipe jacking technology has matured, and pipe jacking construction in large and medium-sized cities is gradually developing towards larger diameters, greater burial depths, and larger volumes.

[0003] During pipe jacking construction, when adding pipe sections, it is necessary to control the hydraulic jacking to retract and stop the jacking process. In related technologies, to prevent pipe section retraction accidents, embedded parts are pre-installed on the outside of the pipe section, and then a backstop is installed to prevent it from moving backward. However, the backstop is generally only installed near the tunnel entrance, so it needs to be reinstalled every time a pipe section is added. This not only reduces the efficiency of pipe jacking construction but also increases labor costs. The installation and removal of backstops built into extra-large cross-section pipes is particularly time-consuming and labor-intensive.

[0004] Therefore, how to reduce the frequency of disassembly and assembly of the anti-reverse frame while ensuring the anti-reverse effect, thereby improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to reduce the frequency of disassembly and assembly of the anti-backlash device while ensuring the anti-backlash effect, thereby improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction, this application provides a pipe jacking built-in reusable anti-backlash device and method.

[0006] The technical solution provided in this application for a built-in reusable anti-backward device and method for pipe jacking is as follows: In a first aspect, a reusable anti-backward device built into a pipe jacking structure includes: Working well; A backrest, which is fixedly installed inside the working well; The pipe section has several circumferentially arranged embedded parts on its inner side. The embedded parts are detachably connected to a slide rail, and the slide rail has equally spaced anti-backflow grooves along its length. A jacking cylinder assembly is fixedly installed on the rear backrest and is used to jack multiple pipe sections for construction. A fixing frame, which is slidably connected to a slide rail inside the jacking section; The longitudinal support beams are provided, and there are at least two sets of longitudinal support beams. The sets of longitudinal support beams are arranged side by side and detachably snapped between the backrest and the fixed frame.

[0007] By adopting the above technical solution, and utilizing the one-way sliding connection between the fixed frame and the slide rail, it is possible to ensure that the fixed frame remains stationary under the locking action of the longitudinal support beam when the jacking cylinder group pushes the pipe section to move. When the jacking cylinder group retracts, the longitudinal support beam can abut between the backrest and the fixed frame, thereby offsetting the backward force of the pipe section. In this way, it is not necessary to reinstall the fixed frame when adding the next pipe section. This can ensure the anti-backward effect while avoiding repeated disassembly and assembly of the fixed frame, which is conducive to improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction.

[0008] Preferably, the embedded part protrudes from the inner surface of the pipe section and has a threaded hole. The slide rail has a countersunk through hole corresponding to the threaded hole. A first limiting plate is welded to the side of the slide rail near the embedded part, and the first limiting plate abuts against the side of the embedded part protruding from the inner surface of the pipe section.

[0009] By adopting the above technical solution, the slide rail can be detachably installed on the embedded part using countersunk screws through threaded holes and countersunk through holes. At the same time, the first limiting plate abuts against the embedded part, which can prevent the countersunk screw from being damaged by shear force during operation. This design effectively ensures the load-bearing capacity and reliability of the column during operation.

[0010] Preferably, the fixing frame includes a column, and internal steel beams are fixedly connected to both ends of the column. The side of the internal steel beam away from the column is provided with a sliding groove that matches the slide rail. The sliding groove passes through both ends of the internal steel beam. Several equidistant hinge shafts are fixedly connected to the internal steel beam inside the sliding groove. An obliquely arranged stop block is oscillatingly connected to the hinge shaft. The stop block abuts against the anti-reverse groove.

[0011] By adopting the above technical solution, the cooperation between the slide rail and the slide groove can ensure a stable and reliable sliding connection between the fixed frame and the slide rail. At the same time, the abutting connection between the stop block and the anti-reverse groove can offset the backward force generated by the pipe section and prevent the pipe section from moving backward. When the jacking cylinder group pushes the pipe section to move, the movement of the anti-reverse groove can cause the obliquely set stop block to swing out of the current anti-reverse groove and then enter the next anti-reverse groove. In this way, a unidirectional sliding connection between the fixed frame and the slide rail can be realized, so as to facilitate the continuous advancement of multiple pipe sections.

[0012] Preferably, an elastic element is fixedly installed inside the internal steel beam, and the elastic element abuts against the stop block to press the stop block into the anti-reverse groove.

[0013] By adopting the above technical solution, the elastic element can keep the stop block pressed against the slide rail, so as to ensure the reliability of the contact between the stop block and the anti-reverse groove.

[0014] Preferably, the elastic element includes a mounting cylinder, which is fixedly installed inside the internal steel beam. A push rod is slidably connected inside the mounting cylinder. One end of the push rod located outside the mounting cylinder is abutted against the stop block, and the other end of the push rod located inside the mounting cylinder is abutted against a spring.

[0015] By adopting the above technical solution, installing the spring inside the mounting cylinder can prevent soil and moisture in the working environment from directly contacting the spring, which could cause the spring to jam or corrode, thus ensuring the performance and lifespan of the spring.

[0016] Preferably, a pressure sensor is connected to the end of the spring away from the push rod, and the pressure sensor is electrically connected to an alarm.

[0017] By adopting the above technical solution, a pressure sensor can be used to detect changes in pressure on the spring. When the jacking cylinder pushes the pipe section to move and causes the stop block to exit the current anti-reverse groove, the pressure on the spring will increase. After the pressure increases, the alarm will sound, thus reminding the workers that the stop block has exited the anti-reverse groove. This can ensure the working status of the anti-reverse device and improve the safety of the pipe jacking construction process.

[0018] Preferably, the longitudinal support beam includes a first fixed part, a second fixed part, and a rotating part. The first fixed part is detachably connected to the backrest. The rotating part is rotatably connected to the end of the first fixed part away from the backrest. The second fixed part is detachably connected to the column. A locking block is fixedly connected to the end of the rotating part away from the first fixed part. A slot matching the locking block is opened at the end of the second fixed part away from the column. Both the locking block and the slot are designed to be arc-shaped, and the center of the arc is the center of the rotatable connection between the rotating part and the first fixed part.

[0019] By adopting the above technical solution, and utilizing the interlocking of the arc-shaped locking block and the locking groove, during the working process, not only can the second fixing part and the rotating part be disconnected and connected by rotating the rotating part, but after the second fixing part and the rotating part are disconnected, the pipe section can quickly enter the installation position through the longitudinal support beam. After the second fixing part and the rotating part are engaged, the longitudinal support beam can both abut against the backrest and the fixed frame during the working process to form support and prevent the pipe section from moving backward, and also engage between the backrest and the fixed frame to form positioning and prevent the fixed frame from moving with the pipe section, thus significantly improving the efficiency of pipe jacking construction.

[0020] Optionally, the cross-sectional shape of the anti-reverse groove is triangular.

[0021] By adopting the above technical solution, the cross-sectional shape of the anti-reverse groove is set to a triangle, which can form an abutment surface that contacts the stop block and an inclined surface that facilitates the stop block to exit the anti-reverse groove inside the anti-reverse groove. This not only helps to ensure the fit performance between the stop block and the anti-reverse groove, but also increases the structural strength of the slide rail.

[0022] Optionally, the cross-sectional shape of the anti-reverse groove is rectangular.

[0023] By adopting the above technical solution, the cross-sectional shape of the anti-reverse groove is set to a rectangle, which can form two contact surfaces that contact the stop block inside the anti-reverse groove. In this way, there will be no directional requirements when installing the slide rail and hoisting the pipe section, reducing the construction difficulty and improving the construction efficiency.

[0024] Secondly, a reusable anti-backward method with built-in pipe jacking includes the following steps: S1. Install the slide rail on the embedded part inside the pipe section to be jacked up; S2. Use the jacking cylinder assembly to jack up and hold a pipe section; S3. Install the fixing bracket on the slide rail inside the pipe section after jacking; S4. Simultaneously, install the two sets of longitudinal support beams between the backrest and the fixed frame using a snap-fit ​​method. S5. Retract the jacking cylinder assembly; S6. Hoist the next pipe section to be installed; S7. Disassemble the first set of longitudinal support beams; S8. Lower the pipe section to the position where it passes through the first set of longitudinal support beams and hold it there; S9. Connect the first set of longitudinal support beams; S10. Disassemble the second set of longitudinal support beams; S11. Move the pipe section to the position where it passes through the second set of longitudinal support beams and lower it to the installation position; S12. Use the jacking cylinder assembly to jack up the pipe section that has entered the installation position; S13. Complete the jacking construction of all pipe sections to be jacked according to the methods of S5-S12.

[0025] By adopting the above technical solution, and utilizing the one-way sliding connection between the fixed frame and the slide rail, it is possible to ensure that the fixed frame remains stationary under the locking action of the longitudinal support beam when the jacking cylinder group pushes the pipe section to move. When the jacking cylinder group retracts, the longitudinal support beam can abut between the backrest and the fixed frame, thereby offsetting the backward force of the pipe section. In this way, it is not necessary to reinstall the fixed frame when adding the next pipe section. This can ensure the anti-backward effect while avoiding repeated disassembly and assembly of the fixed frame, which is conducive to improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a one-way sliding connection between the fixed frame and the slide rail, which ensures that the fixed frame remains stationary under the locking action of the longitudinal support beam when the jacking cylinder group pushes the pipe section to move. When the jacking cylinder group retracts, the longitudinal support beam can abut between the backrest and the fixed frame, thereby offsetting the backward force of the pipe section. In this way, it is not necessary to reinstall the fixed frame when adding pipe sections, which can avoid repeated disassembly and assembly of the fixed frame while ensuring the anti-backward effect. This is beneficial to improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction.

[0027] 2. This application utilizes the cooperation between the slide rail and the slide groove to ensure a stable and reliable sliding connection between the fixed frame and the slide rail. At the same time, the abutting connection between the stop block and the anti-reverse groove can offset the backward force generated by the pipe section and prevent the pipe section from moving backward. When the jacking cylinder group pushes the pipe section to move, the movement of the anti-reverse groove can cause the obliquely set stop block to swing out of the current anti-reverse groove and then enter the next anti-reverse groove. This can realize a one-way sliding connection between the fixed frame and the slide rail, so as to facilitate the continuous advancement of multiple pipe sections.

[0028] 3. By utilizing the interlocking of arc-shaped locking blocks and slots, the second fixed part and the rotating part can be disconnected and connected during operation through the swinging rotating part. After the second fixed part and the rotating part are disconnected, the pipe section can quickly enter the installation position through the longitudinal support beam. After the second fixed part and the rotating part are engaged, the longitudinal support beam can not only abut against the backrest and the fixed frame to form support and prevent the pipe section from moving backward during operation, but also lock between the backrest and the fixed frame to form positioning and prevent the fixed frame from moving with the pipe section, thus significantly improving the efficiency of pipe jacking construction. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the assembly state structure of the anti-reverse device of Embodiment 1 of this application.

[0030] Figure 2 This is a schematic diagram of the disassembled structure of the anti-reverse device of Embodiment 1 of this application.

[0031] Figure 3 This is a schematic diagram of the internal structure of the anti-reverse device in Embodiment 1 of this application.

[0032] Figure 4 yes Figure 3 Enlarged schematic diagram of Part I of the structure.

[0033] Figure 5 yes Figure 3 Enlarged schematic diagram of Part II of the structure.

[0034] Figure 6 This is a schematic diagram of the internal structure from a first perspective of Embodiment 1 of this application.

[0035] Figure 7 This is a schematic diagram of the internal structure from a second perspective of Embodiment 1 of this application.

[0036] Explanation of reference numerals in the attached drawings: 100, working well; 101, reinforcing layer; 200, backrest; 300, pipe section; 301, embedded part; 3011, threaded hole; 302, slide rail; 3021, countersunk through hole; 3022, first limiting plate; 303, anti-reverse groove; 3031, abutment surface; 3032, inclined surface; 400, jacking cylinder assembly; 401, jacking iron; 500, fixing frame; 5 01. Column; 502. Internal steel beam; 503. Slide groove; 504. Hinge shaft; 505. Stop block; 506. Elastic element; 5061. Mounting cylinder; 5062. Push rod; 5063. Spring; 5064. Pressure sensor; 600. Longitudinal support beam; 601. First fixing part; 602. Second fixing part; 603. Rotating part; 604. Locking block; 605. Locking groove. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] This application discloses a built-in reusable anti-backward device and method for pipe jacking.

[0041] Example 1 Please refer to the above as well. Figure 1 and Figure 2 In one embodiment of this application, a pipe jacking built-in reusable anti-reverse device includes a working shaft 100. The inner wall of the working shaft 100 is provided with a reinforcement layer 101 made of steel reinforcement and concrete. A tunnel entrance is opened on one side surface of the reinforcement layer 101, and a backrest 200 is fixedly installed on the side facing the tunnel entrance. A jacking cylinder assembly 400 is fixedly installed on the backrest 200. A jacking iron 401 is installed on the jacking cylinder assembly 400. A pipe section 300 is provided between the jacking iron 401 and the tunnel entrance. The jacking cylinder assembly 400 can push the pipe section 300 into the tunnel entrance.

[0042] Please refer to the above as well. Figure 1 and Figure 2In one embodiment of this application, a plurality of axially arranged embedded parts 301 are provided on the inner side of the pipe section 300. A slide rail 302 is detachably connected to the embedded part 301. A fixed frame 500 is unidirectionally slidably connected to the slide rail 302. Two sets of longitudinal support beams 600 arranged in parallel at different heights are detachably snap-fit ​​connected to the fixed frame 500. The end of the longitudinal support beam 600 away from the fixed frame 500 is detachably connected to the backrest 200. By utilizing the one-way sliding connection between the fixed frame 500 and the slide rail 302, the fixed frame 500 can remain stationary under the locking action of the longitudinal support beam 600 when the jacking cylinder assembly 400 pushes the pipe section 300 to move. When the jacking cylinder assembly 400 retracts, the longitudinal support beam 600 can abut between the backrest 200 and the fixed frame 500, thereby offsetting the backward force of the pipe section 300. In this way, it is not necessary to reinstall the fixed frame 500 when adding the next pipe section 300. This can ensure the anti-backward effect while avoiding repeated disassembly and assembly of the fixed frame 500, which is conducive to improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction.

[0043] Please refer to the above as well. Figure 3 and Figure 4 In one embodiment of this application, the slide rail 302 has equidistant anti-reverse grooves 303 along its length. The embedded part 301 protrudes from the inner surface of the pipe section 300 and has a threaded hole 3011. The slide rail 302 has a countersunk through hole 3021 corresponding to the threaded hole 3011. A first limiting plate 3022 is welded to the side of the slide rail 302 near the embedded part 301. The first limiting plate 3022 abuts against the side of the embedded part 301 protruding from the inner surface of the pipe section 300. By using the threaded hole 3011 and the countersunk through hole 3021, the slide rail 302 can be detachably installed on the embedded part 301 using countersunk screws. At the same time, by using the first limiting plate 3022 to abut against the embedded part 301, the countersunk screws can be prevented from being damaged by shear force during operation. This design effectively ensures the load-bearing capacity and reliability of the column during operation.

[0044] Please refer to the above as well. Figure 3 and Figure 4 In one embodiment of this application, the cross-sectional shape of the anti-reverse groove 303 is triangular. Setting the cross-sectional shape of the anti-reverse groove 303 to be triangular allows for the formation of an abutment surface 3031 that contacts the stop block 505 and an inclined surface 3032 that facilitates the exit of the stop block 505 from the anti-reverse groove 303. This not only helps to ensure the fit performance between the stop block 505 and the anti-reverse groove 303, but also increases the structural strength of the slide rail 302.

[0045] Please refer to the above as well. Figure 3 and Figure 5In another embodiment of this application, the cross-sectional shape of the anti-reverse groove 303 is rectangular. By setting the cross-sectional shape of the anti-reverse groove 303 to a rectangle, two abutment surfaces 3031 that contact the stop block 505 can be formed inside the anti-reverse groove 303. In this way, there will be no directional requirements when installing the slide rail 302 and the hoisting pipe section 300, which reduces the difficulty of construction and helps to improve the efficiency of construction.

[0046] Of course, in other embodiments of this application, the cross-sectional shape of the anti-reverse groove 303 can also be set as a structure with at least one abutting surface, such as trapezoid, parallelogram, etc.

[0047] Please refer to the above as well. Figure 3 , Figure 5 and Figure 6 In one embodiment of this application, the fixing frame 500 includes a column 501, with internal steel beams 502 fixedly connected to both ends of the column 501. A sliding groove 503 matching the slide rail 302 is formed on the side of the internal steel beam 502 away from the column 501, and the sliding groove 503 passes through both ends of the internal steel beam 502. Several equidistant hinge shafts 504 are fixedly connected to the internal steel beam 502 inside the sliding groove 503. An obliquely arranged stop block 505 is oscillatingly connected to each hinge shaft 504, and the stop block 505 abuts against the anti-reverse groove 303. The mutual cooperation between the slide rail 302 and the sliding groove 503... This ensures a stable and reliable sliding connection between the fixed frame 500 and the slide rail 302. Simultaneously, the abutting connection between the stop block 505 and the anti-reverse groove 303 counteracts the backward force generated by the pipe section 300, preventing it from retracting. When the jacking cylinder assembly 400 pushes the pipe section 300 to move, the movement of the anti-reverse groove 303 causes the obliquely positioned stop block 505 to swing out of the current anti-reverse groove 303 and then enter the next anti-reverse groove 303. This allows for a unidirectional sliding connection between the fixed frame 500 and the slide rail 302, facilitating the continuous advancement of multiple pipe sections 300 during construction.

[0048] Please refer to the above as well. Figure 3 and Figure 5 In one embodiment of this application, an elastic element 506 is fixedly installed inside the internal steel beam 502. The elastic element 506 abuts against the stop block 505 to press the stop block 505 into the anti-reverse groove 303. The elastic element 506 can keep the stop block 505 pressed against the slide rail 302 to ensure the reliability of the contact between the stop block 505 and the anti-reverse groove 303.

[0049] Please refer to Figure 5In one embodiment of this application, the elastic element 506 includes a mounting cylinder 5061, which is fixedly installed inside the internal steel beam 502. A push rod 5062 is slidably connected inside the mounting cylinder 5061. One end of the push rod 5062 located outside the mounting cylinder 5061 abuts against a stop block 505. The other end of the push rod 5062 located inside the mounting cylinder 5061 abuts against a spring 5063. The end of the spring 5063 away from the push rod 5062 abuts against a pressure sensor 5064, which is electrically connected to an alarm. Installing the spring 5063 inside the mounting cylinder 5061 avoids direct contact between the spring 5063 and soil or moisture in the working environment, preventing the spring 5063 from jamming or corroding, thus ensuring the performance and lifespan of the spring 5063. The pressure sensor 5064 can detect pressure changes on the spring 5063. When the jacking cylinder group 400 pushes the pipe section 300 to move and causes the stop block 505 to exit the current anti-reverse groove 303, the pressure on the spring 5063 will increase. After the pressure increases, the alarm will sound, thus reminding the workers that the stop block 505 has exited the anti-reverse groove 303. This can ensure the working status of the anti-reverse device and improve the safety of the pipe jacking construction process.

[0050] Please refer to the above as well. Figure 6 and Figure 7 In one embodiment of this application, the longitudinal support beam 600 includes a first fixing part 601, a second fixing part 602, and a rotating part 603. The first fixing part 601 is detachably connected to the backrest 200. The rotating part 603 is rotatably connected to the end of the first fixing part 601 away from the backrest 200. The second fixing part 602 is detachably connected to the column 501. A locking block 604 is fixedly connected to the end of the rotating part 603 away from the first fixing part 601. A slot 605 matching the locking block 604 is opened at the end of the second fixing part 602 away from the column 501. Both the locking block 604 and the slot 605 are designed to be arc-shaped, and the center of the arc is the center of the rotatable connection between the rotating part 603 and the first fixing part 601. By utilizing the interlocking of the arc-shaped locking block 604 and the locking groove 605, during operation, the second fixing part 602 and the rotating part 603 can be disconnected and connected through the swinging rotating part 603. After the second fixing part 602 and the rotating part 603 are disconnected, the pipe section 300 can quickly enter the installation position through the longitudinal support beam 600. After the second fixing part 602 and the rotating part 603 are engaged, the longitudinal support beam 600 can both abut against the backrest 200 and the fixed frame 500 during operation to form support and prevent the pipe section 300 from moving backward, and also engage between the backrest 200 and the fixed frame 500 to form positioning and prevent the fixed frame 500 from moving with the pipe section 300, thus significantly improving the efficiency of pipe jacking construction.

[0051] Example 2 A reusable anti-backward method with built-in pipe jacking system includes the following steps: S1. Install the slide rail 302 on the embedded part 301 inside the pipe section 300 to be jacked up; S2. Use the jacking cylinder assembly 400 to jack and hold a pipe section 300; S3. Install the fixing bracket 500 on the slide rail 302 inside the pipe section 300 after the jacking is completed; S4. Simultaneously, install the two sets of longitudinal support beams 600 between the backrest 200 and the fixing frame 500 by snap-fitting. S5, retract the jacking cylinder assembly 400; S6. Hoist the next pipe section to be installed (300mm); S7. Disassemble the first set of longitudinal support beams 600; S8. Lower pipe section 300 to the position where it passes through the first set of longitudinal support beams 600 after disassembly and hold it there. S9, Connect the first set of longitudinal support beams 600; S10, Disassemble the second set of longitudinal support beams 600; S11. Lower pipe section 300 to the position where it passes through the second set of longitudinal support beams 600 after disassembly and to the installation position; S12. Use the jacking cylinder assembly 400 to jack up the pipe section 300 that has entered the installation position. S13. Complete the jacking construction of all 300mm pipe sections to be jacked according to the methods of S5-S12.

[0052] By adopting the above method, the jacking construction of all pipe sections 300 to be jacked can be completed conveniently and quickly. During the operation, the fixed frame 500 and the slide rail 302 are connected in one direction. When the jacking cylinder group 400 pushes the pipe section 300 to move, the fixed frame 500 can be kept still under the locking action of the longitudinal support beam 600. When the jacking cylinder group 400 is retracted, the longitudinal support beam 600 can abut between the backrest 200 and the fixed frame 500, thereby offsetting the backward force of the pipe section 300. In this way, when adding the next pipe section 300, it is not necessary to reinstall the fixed frame 500. While ensuring the anti-backward effect, it is also possible to avoid repeated disassembly and assembly of the fixed frame 500, which is conducive to improving the efficiency of pipe jacking construction and reducing the labor cost of pipe jacking construction.

[0053] 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 reusable anti-backward device built into a pipe jacking unit, characterized in that, include: Working well (100); A backrest (200) is fixedly installed inside the working well (100); Pipe section (300), the inner side of the pipe section (300) is provided with a number of circumferentially arranged embedded parts (301), the embedded parts (301) are detachably connected to slide rails (302), and the slide rails (302) are provided with equally spaced anti-reverse grooves (303) along their length direction. A jacking cylinder assembly (400) is fixedly installed on the backrest (200) and is used to jack up multiple pipe sections (300). A fixing frame (500) is unidirectionally slidably connected to a slide rail (302) inside the jacking section (300); The longitudinal support beams (600) are arranged in at least two sets, and multiple sets of longitudinal support beams (600) are arranged side by side and detachably snapped between the backrest (200) and the fixing frame (500). The fixing frame (500) includes a column (501), and internal steel beams (502) are fixedly connected to both ends of the column (501). The side of the internal steel beam (502) away from the column (501) is provided with a groove (503) that matches the slide rail (302). The groove (503) passes through both ends of the internal steel beam (502). Several equidistant hinge shafts (504) are fixedly connected to the internal steel beam (502) inside the groove (503). An obliquely arranged stop block (505) is swayed on the hinge shaft (504). The stop block (505) abuts against the anti-reverse groove (303). The longitudinal support beam (600) includes a first fixing part (601), a second fixing part (602), and a rotating part (603). The first fixing part (601) is detachably connected to the backrest (200). The rotating part (603) is rotatably connected to the end of the first fixing part (601) away from the backrest (200). The second fixing part (602) is detachably connected to the column (501). A locking block (604) is fixedly connected to the end of the rotating part (603) away from the first fixing part (601). A slot (605) matching the locking block (604) is opened at the end of the second fixing part (602) away from the column (501). Both the locking block (604) and the slot (605) are designed to be arc-shaped, and the center of the arc is the center of the rotatable connection between the rotating part (603) and the first fixing part (601).

2. The built-in reusable anti-backward device for pipe jacking according to claim 1, characterized in that: The embedded part (301) protrudes from the inner surface of the pipe section (300) and has a threaded hole (3011). The slide rail (302) has a countersunk through hole (3021) corresponding to the threaded hole (3011). A first limiting plate (3022) is welded to the side of the slide rail (302) near the embedded part (301). The first limiting plate (3022) abuts against the side of the embedded part (301) protruding from the inner surface of the pipe section (300).

3. The built-in reusable anti-backward device for pipe jacking according to claim 1, characterized in that: An elastic element (506) is fixedly installed inside the internal steel beam (502). The elastic element (506) abuts against the stop block (505) to press the stop block (505) against the inside of the anti-reverse groove (303).

4. The built-in reusable anti-backward device for pipe jacking according to claim 3, characterized in that: The elastic element (506) includes a mounting cylinder (5061), which is fixedly installed inside the internal steel beam (502). A push rod (5062) is slidably connected inside the mounting cylinder (5061). One end of the push rod (5062) located outside the mounting cylinder (5061) is abutted against the stop block (505), and the other end of the push rod (5062) located inside the mounting cylinder (5061) is abutted against a spring (5063).

5. The built-in reusable anti-backward device for pipe jacking according to claim 4, characterized in that: The end of the spring (5063) away from the push rod (5062) is connected to a pressure sensor (5064), and the pressure sensor (5064) is electrically connected to an alarm.

6. The built-in reusable anti-backward device for pipe jacking according to any one of claims 1-5, characterized in that: The cross-sectional shape of the anti-reverse groove (303) is triangular.

7. The built-in reusable anti-backward device for pipe jacking according to any one of claims 1-5, characterized in that: The cross-sectional shape of the anti-reverse groove (303) is rectangular.

8. A reusable anti-backward method with built-in pipe jacking, characterized in that, The method of using the built-in reusable anti-backward device for pipe jacking as described in any one of claims 1-7 includes the following steps: S1. Install the slide rail (302) on the embedded part (301) inside the pipe section (300) to be jacked up; S2. Use the jacking cylinder assembly (400) to jack and hold a pipe section (300); S3. Install the fixing bracket (500) on the slide rail (302) inside the pipe section (300) after jacking; S4. Simultaneously install two sets of longitudinal support beams (600) between the backrest (200) and the fixing frame (500); S5. Retract the top cylinder assembly (400); S6. Hoist the next pipe section to be installed (300). S7. Disassemble the first set of longitudinal support beams (600); S8. Lower the pipe section (300) to the position where it passes through the first set of longitudinal support beams (600) and hold it there; S9. Connect the first set of longitudinal support beams (600). S10. Disassemble the second set of longitudinal support beams (600). S11, lower the pipe section (300) to the position where it passes through the second set of longitudinal support beams (600) after disassembly, and to the installation position; S12. Use the jacking cylinder assembly (400) to jack up the pipe section (300) that has entered the installation position; S13. Complete the jacking construction of all pipe sections (300) to be jacked according to the methods of S5-S12.

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