Pipe jacking apparatus

Abstract

The application relates to a pipe jacking device, belonging to the technical field of pipe jacking construction, which comprises a shell and an assembled cutter head, the shell is sleeved on the outer wall of the front end of a first section of pipe, a main shaft fixing plate and a back plate are fixed on the inner wall of the first section of pipe, the main shaft of the assembled cutter head penetrates through the back plate and is fixed with the main shaft fixing plate, the back plate separates the space on both sides of the first section of pipe, a spiral elevator is arranged in the first section of pipe, one end of the spiral elevator penetrates through the main shaft fixing plate and the back plate in sequence, the spiral elevator is slidably connected with the back plate, the sliding direction is along the vertical direction, and the spiral elevator is arranged to be inclined downward along the direction close to the assembled cutter head; a hydraulic cylinder and a push plate are arranged between the spiral elevator and the main shaft fixing plate, the hydraulic cylinder and the push plate lift or lower the inclination angle of the spiral elevator in the vertical direction; a limiting assembly for fixing the spiral elevator and the back plate is arranged on the back plate, the application has the effects of improving the utilization rate of the spiral conveying mechanism and reducing the construction cost.

Description

Technical Field

[0001] This application relates to the technical field of pipe jacking construction, and in particular to a pipe jacking device. Background Technology

[0002] Pipe jacking is a trenchless construction method, a technology for laying pipelines with little or no excavation. In pipe jacking, the jacking equipment in the working pit generates jacking force to overcome the friction between the pipeline and the surrounding soil, pushing the pipeline into the ground at the designed slope, and then removing the excavated soil.

[0003] For ease of installation, the pipe jacking equipment is installed in sections within the working pit and assembled there. After one section of pipe is jacked into the soil, the next section is installed and the process continues. The principle is to use the thrust from the main jacking cylinder and the pipe sections and intermediate sections to propel the tool pipe or tunneling machine through the soil from the working pit to the designated position. A casing is installed at the front end of the first pipe section, with an assembly cutterhead and a screw conveyor mechanism at its front end. The assembly cutterhead cuts the soil, while a main shaft fixing plate is installed inside the casing. This plate supports the main drive shaft of the assembly cutterhead, ensuring its stable placement. The main shaft fixing plate also fixes the screw conveyor mechanism, which is tilted to transport and lift the soil cut by the assembly cutterhead from one side of the main shaft support rod to the other side, finally dumping it onto a subsequent transport vehicle to remove the cut soil, thus ensuring the stable forward excavation of the pipeline.

[0004] During actual construction, the inventors discovered that since the pipes have different diameters, fixing the main shaft fixing plate to the shell is easy to solve on the construction site. The inner diameter of the pipe can be met by directly fixing it with flanges, welding it or cutting the original main shaft fixing plate. However, the length of the screw conveyor mechanism remains unchanged, and the tilt angle between the main shaft fixing plate and the bolt conveyor mechanism remains unchanged. This will cause the screw conveyor mechanism to obstruct the inner wall of the pipe after the pipe diameter becomes smaller. Summary of the Invention

[0005] In order to apply the screw conveyor mechanism to pipes of different diameters in the same project, improve the utilization rate of the screw conveyor mechanism, and reduce construction costs, this application provides a pipe jacking device.

[0006] The pipe jacking equipment provided in this application adopts the following technical solution:

[0007] A pipe jacking device includes a housing and an assembled cutterhead. One end of the housing is sleeved around the outer wall of the front end of a first pipe section. A main shaft fixing plate and a back plate are fixed on the inner wall of the first pipe section. The main shaft of the assembled cutterhead passes through the back plate and is fixed to the main shaft fixing plate. The back plate separates the spaces on both sides of the first pipe section. A spiral elevator is installed inside the first pipe section. One end of the spiral elevator passes through the main shaft fixing plate and the back plate in sequence. The spiral elevator is slidably connected to the back plate, and the sliding direction is vertical. The spiral elevator is inclined downward along the direction close to the assembled cutterhead. A clearance hole is opened on the main shaft fixing plate. A hydraulic cylinder and a push plate are installed between the spiral elevator and the main shaft fixing plate. One end of the hydraulic cylinder body is fixedly connected to the inner wall of the clearance hole, and one end of the hydraulic cylinder piston rod is hinged to the push plate. The push plate abuts against the outer wall of the spiral elevator. A single hydraulic cylinder and a single push plate form a group, and multiple groups are arranged at intervals along the circumferential inner wall of the clearance hole. A limiting component is provided on the back plate to fix the spiral elevator to the back plate.

[0008] By adopting the above technical solution, when the inner diameter of the pipe changes, the hydraulic cylinder, in conjunction with the push plate, adjusts the position of the screw conveyor. The end of the screw conveyor connected to the back plate slides on the back plate, thereby achieving the effect of adjusting the tilt angle of the screw conveyor. When the tilt angle changes, although the inner diameter of the pipe changes, the screw conveyor can still be accommodated. After the tilt angle of the screw conveyor changes, the length between the back plate and the main shaft fixing plate also changes. However, since the screw conveyor is supported and clamped by the cooperation of the hydraulic cylinder and the push plate, there will be no obstruction. With the help of the limiting components on the back plate, the position of the screw conveyor and the back plate is fixed, achieving the effect that the same screw conveyor can still be used in pipes of different diameters.

[0009] Optionally, the back plate has an elongated hole, which is opened vertically; the limiting component includes a guide plate and strips, two guide plates are provided, which are respectively distributed on both sides of the elongated hole. The guide plates are arranged along the length of the elongated hole, and limiting holes are provided on the guide plates. The limiting holes are opened along the length of the guide plates and penetrate the guide plates along the line connecting the two guide plates. Multiple strips are provided, which are arranged across the elongated hole. The ends of the strips are inserted into the corresponding adjacent limiting holes. Adjacent strips are arranged in abutment along the vertical direction, and the cumulative height of all strips along the vertical direction is not less than the length of the elongated hole; a positioning component is provided on the guide plate to limit the movement of the strips in the vertical direction.

[0010] By adopting the above technical solution, the opening of the elongated hole provides a moving path for the end of the spiral elevator located on the back plate, the guide plate provides a space for the placement of the strip plate, and the setting of the strip plate serves to block the elongated hole and also serves to support the spiral elevator.

[0011] Optionally, the positioning component includes a positioning strip and a positioning spring. A first positioning hole is provided on the guide plate. The first positioning hole is located on the wall of the limiting hole and is provided at intervals along the length of the limiting hole. A second positioning hole is provided on the strip. One end of the positioning spring is fixedly connected to the inner wall of the first positioning hole, and the other end is fixedly connected to the positioning strip. One end of the positioning strip is inserted into the first positioning hole. After the end of the strip is inserted into the corresponding limiting hole, the other end of the positioning strip is inserted into the second positioning hole. Along the length of the strip, both sides of the end of the positioning strip away from the positioning spring are chamfered.

[0012] By adopting the above technical solution, the positioning spring applies a pushing force to the positioning strip, so that the positioning strip can be locked in the second positioning hole, thereby limiting the strip in the vertical direction. When the lower strip is pulled away, the adjacent upper strip remains in its original state, thus ensuring the sealing effect of the long strip hole and not affecting the adjustment of the spiral elevator position. Since the end of the positioning strip is chamfered, it does not affect the horizontal movement of the strip.

[0013] Optionally, the back plate is provided with a driving assembly, which includes a cylinder and an electromagnetic chuck. The cylinder is slidably connected to the back plate and slides in a vertical direction. The cylinder is horizontally positioned, and one end of the cylinder piston rod is fixedly connected to the electromagnetic chuck. After the electromagnetic chuck is energized, it is attracted and connected to the end of the strip.

[0014] By adopting the above technical solution, the cylinder and electromagnetic chuck can move the strip horizontally, thereby cooperating with the screw conveyor for position adjustment, which is simple and convenient to operate.

[0015] Optionally, a sealing assembly is fixed to the outer wall of the screw conveyor. The sealing assembly includes a ring plate, a sealing ring, and a thrust spring. The ring plate is fixed to the outer wall of the screw conveyor, the sealing ring is fitted on the outer wall of the screw conveyor and slides along the length of the screw conveyor, one end of the thrust spring is fixedly connected to the sealing ring, and the other end is fixedly connected to the ring plate. The sealing assembly is located between the back plate and the main shaft fixing plate.

[0016] By adopting the above technical solution, after the corresponding strips make way for the screw conveyor, there will be gaps between the outer wall of the screw conveyor and the adjacent strips. These gaps are sealed by the sealing ring, while the ring plate and thrust spring ensure that the sealing ring is tightly attached to the back plate.

[0017] Optionally, the sealing ring is provided with a relief groove, which is opened in the vertical direction. When the sealing ring abuts against the back plate, the end of the guide plate is inserted into the relief groove.

[0018] By adopting the above technical solution, the opening of the relief groove allows the sealing ring to fit tightly against the back plate, further reducing the gap between the sealing ring and the back plate.

[0019] Optionally, the strip is provided with a winding rod and an elastic rope. The winding rod is horizontally arranged and arranged in the direction perpendicular to the strip. One end of the winding rod is rotatably connected to the strip, and the rotation axis is the center line of the winding rod. One end of the elastic rope is fixedly connected to the side wall of the guide plate near the cylinder, and the other end is fixedly connected to the outer wall of the winding rod. When the strip is in the state of spanning the elongated hole, the winding rod abuts against the side wall of the guide plate. When the end of the strip away from the cylinder moves to the center line of the elongated hole, the elastic rope is in the original taut state, and the elastic rope has elasticity.

[0020] By adopting the above technical solution, when the screw conveyor is placed in the long slot, the corresponding strip plate is pulled to make way for the screw conveyor. During the movement of the strip plate, the first half is the process of the elastic rope being released from the winding rod, and the second half is the process of the elastic rope being stretched. Finally, the end of the moving strip plate abuts against the outer wall of the screw conveyor, and the elastic rope provides force to ensure that the end of the corresponding strip plate is in abutting state against the outer wall of the screw conveyor.

[0021] Optionally, a coil spring is provided between the winding rod and the strip, and the coil spring is used to rotate the winding rod to wind up the elastic rope.

[0022] By adopting the above technical solution, the coil spring facilitates the winding of the elastic rope after the winding rod releases the rope.

[0023] Optionally, a spindle reinforcing ring is fixed on the back plate. The spindle reinforcing ring is located between the spindle of the assembled cutter head and the back plate. The spindle reinforcing ring itself is composed of two halves assembled together.

[0024] Optionally, the strip is provided with a concealed groove, and the coil spring is located in the concealed groove.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The hydraulic cylinder, push plate, positioning components, elongated hole, and limiting components work together to set the screw conveyor in a mode where the tilt angle can be adjusted in the vertical direction, thereby improving the application scenarios of the screw conveyor and saving construction costs;

[0027] 2. The winding rod and elastic rope are designed to ensure that the ends of the moved strips are pressed against the outer wall of the screw conveyor.

[0028] 3. The shield machine cutting ring is located at the foremost end of the shield shell to define the outline of the excavation section and provide cover for the excavation operation. It is a type of circular cutter body, usually with a wedge-shaped cutting edge at the front end to facilitate the shield's entry into the soil layer during advancement. However, this application omits the cutting ring, replacing it with the shell to make the structure lighter and ensure that all supports are on the outer wall of the shell for greater stability. If the cutting ring were still present, it would only be suitable for flat-edged cutters, limiting its application range. Furthermore, during disassembly, the outer diameter of the cutting ring is the same as the outer diameter of the concrete jacking pipe, and it is... The wedge-shaped cutting edge and the cutting ring can only be removed by retracting along the jacking path, which is inconvenient for disassembly. In this application, the shell replaces the cutting ring, overcoming the above-mentioned inconveniences. Moreover, both the reinforcing ring and the assembled cutter head are designed as two detachable halves. The assembled cutter head is fixed and reinforced by the reinforcing ring, which facilitates the disassembly of the assembled cutter head. After the entire construction is completed, the convenient disassembly allows workers to pull the construction equipment out of the working shaft, eliminating the need to open the receiving shaft, thus overcoming the problem of the inability to open the receiving shaft, further saving construction costs and improving the convenience of construction. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0030] Figure 2 Figure 1 Sectional view at point 1-1;

[0031] Figure 3 Figure 1 Sectional view at point 2-2 in the middle;

[0032] Figure 4 This is a schematic diagram of the internal structure of the first connecting pipe after the hidden part of the cutter head is assembled;

[0033] Figure 5 This is a schematic diagram to illustrate part of the structure at the yielding hole;

[0034] Figure 6 This is a schematic diagram to illustrate part of the structure of the limiting component;

[0035] Figure 7 This is a schematic diagram to illustrate part of the structure of the sealing assembly;

[0036] Figure 8 yes Figure 7 Enlarged view of section A in the middle;

[0037] Figure 9 This is an exploded view to show the structure of the coiled spring section.

[0038] In the diagram, 1. Shell; 11. Assembled cutter head; 12. First pipe section; 13. Main spindle fixing plate; 131. Clearance hole; 132. Main spindle fixing retainer; 14. Screw elevator; 2. Back plate; 21. Long strip hole; 22. Reinforcing ring; 23. Strengthening ring; 24. Rubber sealing ring; 25. Embedded connector; 3. Hydraulic cylinder; 31. Push plate; 4. Limiting assembly; 41. Guide plate; 411. Limiting hole; 412. First positioning hole; 42. Strip plate; 421. Second positioning hole; 5. Positioning assembly; 51. Positioning strip; 52. Positioning spring; 6. Drive assembly; 61. Cylinder; 62. Electromagnetic chuck; 7. Sealing assembly; 71. Ring plate; 72. Sealing ring; 721. Clearance groove; 73. Thrust spring; 8. Winding rod; 81. Elastic rope; 82. Coil spring; 83. Concealed groove. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0040] This application discloses a pipe jacking device.

[0041] refer to Figure 1 A pipe jacking device includes a housing 1 and an assembled cutterhead 11. The housing 1, after assembly, is a cylindrical tube. During pipe jacking construction, multiple sections of concrete pipe are prepared. The housing 1 is fixed to the outer wall of the front end of the first pipe section 12, serving as reinforcement and support. A back plate 2 and a main shaft fixing plate 13 are fixed to the inner wall of the first pipe section 12. The back plate 2 divides the first pipe section 12 into two spaces. The assembled cutterhead 11 is located at the front end of the housing 1, and the main shaft fixing plate 13 is located on the side of the back plate 2 away from the assembled cutterhead 11. The assembled cutterhead 11 cuts the soil. The main shaft of the assembled cutterhead 11 passes through the back plate 2 and the main shaft fixing plate 13 in sequence. The main shaft of the assembled cutterhead 11 is fixed to the back plate 2. On plate 2 and main shaft fixing plate 13, a screw conveyor 14 is installed inside the first section of pipe 12. The screw conveyor 14 transports the soil cut by the assembled cutter head 11 to the other side of the back plate 2, thereby ensuring continuous cutting of the soil in front of the assembled cutter head 11. In normal state, the screw conveyor 14 is inclined downward along the direction close to the assembled cutter head 11. The screw conveyor 14 can change its tilt angle in the vertical direction. By adjusting the tilt angle when dealing with concrete pipes of different inner diameters, it can be ensured that the screw conveyor 14 does not obstruct the inner wall of the concrete pipe, so as to make full use of the screw conveyor 14, reduce the number of replacements, and reduce construction costs.

[0042] refer to Figure 1 and Figure 2A reinforcing ring 22 is provided between the back plate 2 and the main shaft of the assembled cutter head 11. The reinforcing ring 22 is fixedly connected to the back plate 2, and the reinforcing ring 22 is located where the main shaft of the assembled cutter head 11 passes through the back plate 2. The reinforcing ring 22 improves the load-bearing capacity of the back plate 2. The main shaft reinforcing ring 22 itself is assembled in two halves, which facilitates the subsequent disassembly of the assembled cutter head 11. The assembled cutter head 11 is also assembled in multiple halves, which facilitates disassembly. A reinforcing ring 23 and a rubber sealing ring 24 are provided between the back plate 2 and the inner wall of the first section of pipe 12. The reinforcing ring 23 is fixedly arranged around the inner wall of the first section of pipe 12, and the rubber sealing ring 24 is fixed between the outer wall of the reinforcing ring 23 and the inner wall of the first section of pipe 12. A pre-embedded connector 25 is provided between the back plate 2 and the inner wall of the first section of pipe 12 for fixing the back plate 2.

[0043] Reference Figure 3 The spindle of the assembled cutter head 11 is provided with a spindle fixing ring 132 at the spindle fixing plate 13. The spindle fixing ring 132 and the reinforcing ring 22 have the same design concept, both being two-part splicing type, which strengthens the structure while facilitating disassembly.

[0044] refer to Figure 4 and Figure 5 A clearance hole 131 is provided on the main shaft fixing plate 13, which is the passage through which the screw conveyor 14 passes. A hydraulic cylinder 3 and a push plate 31 are provided on the main shaft fixing plate 13. One end of the hydraulic cylinder 3 body is fixedly connected to the inner wall of the clearance hole 131, and one end of the piston rod of the hydraulic cylinder 3 is hinged to the push plate 31. The hinge shaft is horizontally set and its direction is along the jacking direction of the jacking pipe. The push plate 31 abuts against the outer wall of the screw conveyor 14. One hydraulic cylinder 3 and one push plate 31 form a group, and multiple groups are arranged at intervals along the inner wall of the clearance hole 131. This provides support and limit for the screw conveyor 14.

[0045] refer to Figure 6 The back plate 2 has an elongated hole 21, which is vertically oriented. The end of the screw conveyor 14 passes through the elongated hole 21. The back plate 2 is provided with a limiting component 4, which includes a guide plate 41 and a strip plate 42. There are two guide plates 41, which are vertically oriented and distributed on both sides of the elongated hole 21. The guide plates 41 have limiting holes 411, which pass through the guide plates 41 along the line connecting the two guide plates 41. The length of the limiting holes 411 is along the length of the guide plates 41. The length of the strip plate 42 is along the line connecting the two guide plates 41. The strip plate 42 spans the elongated hole 21, and the end of the strip plate 42 is inserted into the corresponding adjacent limiting hole 411. There are multiple strip plates 42, and adjacent strip plates 42 are stacked vertically to block the elongated hole 21. That is, the cumulative vertical height of all strip plates 42 is not less than the length of the elongated hole 21.

[0046] refer to Figure 6The first section of pipe 12 is equipped with a drive assembly 6, which includes a cylinder 61 and an electromagnetic chuck 62. The cylinder 61 is horizontally positioned, and one end of the piston rod of the cylinder 61 is fixedly connected to the electromagnetic chuck 62. The cylinder 61 is slidably connected to the back plate 2, and the sliding line slides vertically. The electromagnetic chuck 62 magnetically attracts the end of the corresponding strip 42, that is, the end of the strip 42 near the electromagnetic chuck 62 is made of a magnetically attractable material. The cylinder 61 can slide by vertically fixing a hydraulic cylinder or an electric cylinder on the back plate 2, thereby driving the cylinder 61 to move vertically.

[0047] refer to Figure 7 and Figure 8 To prevent the strip 42 from sliding freely in the vertical direction, a positioning component 5 is provided between the strip 42 and the guide plate 41. Second positioning holes 421 are provided near both ends of the strip 42. A first positioning hole 412 is provided on the wall of the limiting hole 411 opposite to the hole in the back plate 2. The number of first positioning holes 412 on a single guide plate 41 is the same as the number provided on the strip 42. Adjacent first positioning holes 412 are spaced apart along the length of the limiting hole 411, and the first positioning hole 412 is directly opposite the second positioning hole 421. The positioning component 5 includes a positioning spring 52 and a positioning strip 51. One end of the positioning spring 52 is fixedly connected to the inner wall of the first positioning hole 412, and the other end is fixedly connected to the positioning strip 51. One end of the positioning strip 51 is inserted into the first positioning hole 412, and the other end is inserted into the second positioning hole 421, thereby fixing the strip 42 in the vertical direction. Along the length of the strip 42, the end sidewalls of the positioning strip 51 that are inserted into the first positioning hole 412 are all chamfered, so as to ensure that when the strip 42 slides along its own length, the positioning strip 51 can slide out of the first positioning hole 412 at any time.

[0048] refer to Figure 8 and Figure 9The positioning bar 51 is equipped with a winding rod 8 and an elastic rope 81. A concealed groove 83 is formed on the positioning bar 51, located near the drive assembly 6. The opening of the concealed groove 83 faces away from the back plate 2. The winding rod 8 is horizontally positioned and perpendicular to the bar 42. One end of the winding rod 8 is located at the bottom of the concealed groove 83 and rotatably connected to the bar 42. The rotation axis is the center line of the winding rod 8 itself. One end of the elastic rope 81 is fixed to the outer wall of the winding rod 8, and the other end is fixedly connected to the side wall of the guide plate 41 near the concealed groove 83. The middle part of the elastic rope 81 is wound around the winding rod 8. The winding rod 8 and the concealed groove 81 are connected... A coil spring 82 is provided between the groove walls of the groove 83. One end of the coil spring 82 is fixedly connected to the winding rod 8, and the other end is fixedly connected to the groove wall of the concealed groove 83. The coil spring 82 causes the winding rod 8 to rotate under force and then rotate back under no force, thereby winding up the elastic rope 81 in the slack state. The elastic rope 81 is made of elastic material. When the end of the strip plate 42 away from the cylinder 61 moves to the center line of the elongated hole 21, the elastic rope 81 is in the original taut state. When the strip plate 42 continues to move, the elastic rope 81 is in the stretched state, thereby achieving the state where the end of the strip plate 42 is pressed against the outer wall of the screw conveyor 14.

[0049] refer to Figure 7 A sealing assembly 7 is provided on the outer wall of the screw conveyor 14. The sealing assembly 7 is located between the back plate 2 and the main shaft fixing plate 13. The sealing assembly 7 includes an annular plate 71, a sealing ring 72, and a thrust spring 73. The annular plate 71 is fixedly sleeved on the outer wall of the screw conveyor 14. The sealing ring 72 and the thrust spring 73 are also sleeved on the outer wall of the screw conveyor 14 and slide along the length of the screw conveyor 14. The sealing ring 72 is located on the side of the annular plate 71 closer to the back plate 2. One end of the thrust spring 73 is fixedly connected to the annular plate 71, and the other end is fixedly connected to the sealing ring 72. When the position of the screw conveyor 14 is adjusted, the sealing ring 72 abuts against the corresponding strip plate 42 and guide plate 41. A clearance groove 721 is opened on the sealing ring 72. The clearance groove 721 is opened vertically, and the corresponding guide strip is located in the clearance groove 721.

[0050] The implementation principle of a pipe jacking device in this application embodiment is as follows: after the hydraulic cylinder 3 and the push plate 31 are used to adjust one fulcrum of the fixed spiral elevator 14, the other end of the spiral elevator 14 is provided with a position by pulling out the strip plate 42. Then the spiral elevator 14 is erected in the elongated hole 21. The strip plate 42 and the positioning component 5 provide a second fulcrum for the spiral elevator 14. The two fulcrums cooperate with each other to complete the adjustment of the position of the spiral elevator 14.

[0051] The embodiments described in this specific implementation are 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 pipe jacking device, comprising a housing (1) and an assembled cutterhead (11), wherein one end of the housing (1) is fitted around the outer wall of the front end of a first pipe section (12), characterized in that: The inner wall of the first section of pipe (12) is fixed with a main shaft fixing plate (13) and a back plate (2). The main shaft of the assembled cutter head (11) passes through the back plate (2) and is fixed to the main shaft fixing plate (13). The back plate (2) divides the space on both sides of the first section of pipe (12). A spiral elevator (14) is installed inside the first section of pipe (12). One end of the spiral elevator (14) passes through the main shaft fixing plate (13) and the back plate (2) in sequence. The spiral elevator (14) is slidably connected to the back plate (2). The sliding direction is vertical. The spiral elevator (14) is inclined downward along the direction close to the assembled cutter head (11). A clearance hole is opened on the main shaft fixing plate (13). (131) A hydraulic cylinder (3) and a push plate (31) are provided between the screw conveyor (14) and the main shaft fixing plate (13). One end of the body of the hydraulic cylinder (3) is fixedly connected to the inner wall of the relief hole (131), and one end of the piston rod of the hydraulic cylinder (3) is hinged to the push plate (31). The push plate (31) abuts against the outer wall of the screw conveyor (14). A single hydraulic cylinder (3) and a single push plate (31) form a group, and multiple groups are arranged at intervals along the circumferential inner wall of the relief hole (131). A limiting component (4) is provided on the back plate (2) for the screw conveyor (14) and the back plate (2) to form a fixed connection. An elongated hole (21) is opened on the back plate (2), and the elongated hole (21) is arranged along the... The vertical direction is provided; the limiting component (4) includes a guide plate (41) and a strip plate (42). There are two guide plates (41), which are respectively distributed on both sides of the elongated hole (21). The guide plates (41) are arranged along the length direction of the elongated hole (21). A limiting hole (411) is provided on the guide plate (41). The length direction of the limiting hole (411) is along the length direction of the guide plate (41). The limiting hole (411) passes through the guide plate (41) along the line connecting the two guide plates (41). There are multiple strip plates (42). The strip plates (42) are arranged across the elongated hole (21). The ends of the strip plates (42) are inserted into the corresponding adjacent limiting holes (411). Adjacent strip plates (42) are arranged along the length direction of the elongated hole (21). The strips (42) are arranged vertically and the cumulative height of all strips (42) along the vertical direction is not less than the length of the elongated hole (21). A positioning component (5) is provided on the guide plate (41) to restrict the movement of the strips (42) in the vertical direction. A driving component (6) is provided on the back plate (2). The driving component (6) includes a cylinder (61) and an electromagnetic chuck (62). The cylinder (61) is slidably connected to the back plate (2) and slides in the vertical direction. The cylinder (61) is horizontally set and one end of the piston rod of the cylinder (61) is fixedly connected to the electromagnetic chuck (62). After the electromagnetic chuck (62) is energized, it is attracted to the end of the strip (42).The strip (42) is provided with a winding rod (8) and an elastic rope (81). The winding rod (8) is horizontally arranged and arranged in the direction perpendicular to the strip (42). One end of the winding rod (8) is rotatably connected to the strip (42), and the rotation axis is the center line of the winding rod (8). One end of the elastic rope (81) is fixedly connected to the side wall of the guide plate (41) near the cylinder (61), and the other end is fixedly connected to the outer wall of the winding rod (8). When the strip (42) is in the state of spanning the elongated hole (21), the winding rod (8) abuts against the side wall of the guide plate (41). When the end of the strip (42) away from the cylinder (61) moves to the center line of the elongated hole (21), the elastic rope (81) is in the original taut state, and the elastic rope (81) has elasticity.

2. The pipe jacking equipment according to claim 1, characterized in that: The positioning component (5) includes a positioning strip (51) and a positioning spring (52). A first positioning hole (412) is provided on the guide plate (41). The first positioning hole (412) is located on the wall of the limiting hole (411) and is provided at intervals along the length of the limiting hole (411). A second positioning hole (421) is provided on the strip (42). One end of the positioning spring (52) is fixedly connected to the inner wall of the first positioning hole (412), and the other end is fixedly connected to the positioning strip (51). One end of the positioning strip (51) is inserted into the first positioning hole (412). After the end of the strip (42) is inserted into the corresponding limiting hole (411), the other end of the positioning strip (51) is inserted into the second positioning hole (421). Along the length of the strip (42), both sides of the end of the positioning strip (51) away from the positioning spring (52) are chamfered.

3. The pipe jacking equipment according to claim 1, characterized in that: A sealing assembly (7) is fixedly ringed on the outer wall of the screw conveyor (14). The sealing assembly (7) includes a ring plate (71), a sealing ring (72), and a thrust spring (73). The ring plate (71) is fixedly ringed on the outer wall of the screw conveyor (14). The sealing ring (72) is ringed on the outer wall of the screw conveyor (14) and slides along the length of the screw conveyor (14). One end of the thrust spring (73) is fixedly connected to the sealing ring (72), and the other end is fixedly connected to the ring plate (71). The sealing assembly (7) is located between the back plate (2) and the main shaft fixing plate (13).

4. A pipe jacking device according to claim 3, characterized in that: The sealing ring (72) has a relief groove (721) which is opened in the vertical direction. When the sealing ring (72) abuts against the back plate (2), the end of the guide plate (41) is inserted into the relief groove (721).

5. A pipe jacking device according to claim 4, characterized in that: A coil spring (82) is provided between the winding rod (8) and the strip (42). The coil spring (82) is used to rotate the winding rod (8) to wind up the elastic rope (81).

6. A pipe jacking device according to claim 1, characterized in that: A spindle reinforcing ring (22) is fixed on the back plate (2). The spindle reinforcing ring (22) is located between the spindle of the assembled cutter head (11) and the back plate (2). The spindle reinforcing ring (22) itself is composed of two halves.

7. A pipe jacking device according to claim 5, characterized in that: The strip (42) is provided with a concealed groove (83), and the coil spring (82) is located in the concealed groove (83).

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