A method for constructing underground tunnels using a propulsion sleeve with fluid injection to reduce drag.

Abstract

This invention relates to a method for underground tunnel pipe jacking construction using a propulsion sleeve with fluid injection to reduce resistance. The method involves three steps: First, under the excavation of a jacking machine and the jacking action of a horizontal jacking mechanism, two pipe sections are advanced through the starting shaft until the rear section is inserted into the ground to a predetermined depth. Second, the propulsion sleeve of the front section is opened and filled with water. Third, the two pipe sections are then joined together. This third step is repeated until the pipe jacking machine reaches the receiving shaft. This invention aims to achieve the advantage of low resistance during propulsion, solving the problem of high resistance during propulsion in existing pipe jacking construction methods.

Description

Technical Field

[0001] This invention relates to the field of underground tunnel construction technology, and in particular to a method for underground tunnel pipe jacking construction that uses a propulsion sleeve with fluid injection to reduce resistance. Background Technology

[0002] In engineering construction, underground tunnels (including pipelines) need to be built. Existing tunnel construction methods include: shield tunneling, blasting, open-cut excavation, and pipe jacking. Pipe jacking is a trenchless construction method, a technology for laying pipelines (tunnels) with little or no excavation. Pipe jacking involves using the jacking force generated by jacking equipment within a working pit 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. After one pipe section is pushed 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 pipeline itself, as well as intermediate sections, to advance the pipe section or tunneling machine (pipe jacking machine) from the starting shaft through the soil to the receiving shaft for hoisting. The pipeline follows closely behind the pipe jacking machine, buried between the two pits. When there are construction interferences on the surface, making open-cut excavation inconvenient and the tunnel is small, pipe jacking is the optimal construction method (pipe jacking is not considered a rock-related geological condition). Pipe jacking construction has the following drawbacks: the high friction during advancement leads to high resistance, making it unsuitable for the construction of long-distance tunnels. Summary of the Invention

[0003] This invention aims to provide an underground tunnel pipe jacking construction method that reduces resistance during advancement by injecting fluid into the advancement sleeve, thus solving the problem of high resistance during advancement in existing pipe jacking construction.

[0004] The above technical problems are solved by the following technical solution: a method for constructing underground tunnels using a propulsion sleeve with fluid injection to reduce drag, characterized in that it is accomplished by a pipe jacking device, which includes a pipe jacking machine, a horizontal jacking mechanism, and several pipe sections. Each pipe section is a rectangular structure formed by four pipe section sidewalls integrally molded end-to-end. A propulsion sleeve is fitted onto each pipe section, and the propulsion sleeve is formed by four propulsion sleeve sidewalls that are correspondingly placed horizontally on the four pipe section sidewalls. The four propulsion sleeve sidewalls can be separated and connected together. A push rod is inserted through the side wall of the pipe section, which tops the side wall of the propulsion sleeve. One end of the push rod, located inside the pipe section, is connected to the jacking structure. The push rod has a fluid flow channel connecting the inside and outside of the pipe section. The size of the hole formed underground by the pipe jacking machine is just enough to accommodate the propulsion sleeve in the closed state. The process of underground tunnel pipe jacking construction is as follows: First, under the excavation of the push rod machine and the jacking action of the horizontal jacking mechanism, two pipe sections are pushed through the starting well and advanced to the point where the rear pipe section is inserted into the ground to a set depth; Second, the pipe section located in front is inserted into the ground to the set depth. The first step involves opening the push sleeve and filling it with water: The jacking mechanism drives the push rod to move a set distance outwards from the pipe section and then stops, causing the push sleeve to open. Water is injected from inside the pipe section through the fluid flow channel of the push rod within the opened push sleeve, keeping the push sleeve open. The push rod of the opened pipe section is then retracted. The second step involves connecting two more pipe sections: The two pipe sections are entered one by one through the starting well and connected. Under the digging action of the push rod machine and the jacking action of the horizontal jacking mechanism, the pipe section is inserted for the length of two more pipe sections. The pipe section adjacent to the foremost open thrust sleeve is opened. Throughout the insertion process, water is continuously injected through the push rod inside the thrust sleeve of the opened pipe section to maintain pressure and prevent soil from entering the opened thrust sleeve, thus keeping the opening size of the thrust sleeve constant. Water injection stops when the push rod of the opened pipe section moves to the outside of the thrust sleeve. After water injection into the opened pipe section until the thrust sleeve remains open, the push rod of the pipe section in the deployed state is retracted. This third step is repeated until the pipe jacking machine reaches the receiving well. This method minimizes resistance during jacking, facilitating the construction of long-channel pipe jacking systems.

[0005] Preferably, the lifting structure includes a cavity with four sliding cylinders. A piston is slidably connected within each cylinder. One end of each piston is connected to a piston rod, and the other end of the piston rod is connected to the end of the push rod located inside the pipe section. Each of the four piston rods of the same lifting structure is correspondingly connected to a push rod on each of the four side walls of the pipe sections. The cavity has a fluid inlet. In use, fluid is injected through the inlet, causing the piston rod to extend and lift the push rod. This improves the ease of lifting the push rod.

[0006] Preferably, the piston rod has a limiting recess on its end face, and the push rod passes through the limiting recess and is connected to the piston rod. This ensures good connection reliability.

[0007] Preferably, the push rod is equipped with a limiting block located inside the pipe section; when the push rod is raised to the point where the limiting block abuts against the inner surface of the pipe section, the push sleeve is in an open state, allowing passage for the push sleeve in its closed state. This allows for easy identification of whether the push sleeve is fully open; if the push sleeve is opened too much, it is difficult to maintain the open state (if it is opened and then closed, it will affect the above-ground structure); if it is opened too little, subsequent pipe sections cannot pass through.

[0008] Preferably, two adjacent sidewalls of the same propulsion sleeve abut together and are sealed together by a bendable rigid sealing structure. The rigid sealing structure includes a bendable rigid sealing sheet and a first sealing slot on one end face of the sidewall of the two adjacent propulsion sleeves and a second sealing slot on the end face of the other end face. The first sealing slot has a first sealing slot portion elevation section, and a first hooking step is formed between the first sealing slot portion elevation section and the first sealing slot. The second sealing slot has a second sealing slot portion elevation section, and a second hooking step is formed between the second sealing slot portion elevation section and the second sealing slot. One end of the rigid sealing sheet passes through the first sealing slot portion elevation section and has a first hook joint that mates with the first hooking step. The other end passes through the second sealing slot portion elevation section and has a second hook joint that mates with the second hooking step. The first rigid sealing sheet is slidably sealed together with the first sealing slot and slidably sealed together with the second sealing slot. When the propulsion sleeve is in the unfolded state, the rigid sealing sheet is located outside the rectangle enclosed by the inner surface of the propulsion sleeve. It can maintain a seal, allow for expansion and contraction, and prevent soil pressure from causing the connection of the side wall of the propulsion sleeve in the open state to be recessed, thus preventing subsequent pipe sections from entering. Existing seals are achieved through elastic components, which deform under soil pressure and cannot meet the above requirements.

[0009] Preferably, between adjacent pipe sections, the inner circumferential surface of the rear end of the pipe section located in the advancing direction has a large-diameter section, and the outer circumferential surface of the front end of the pipe section located in the advancing direction has a small-diameter section, with the small-diameter section passing through the large-diameter section. This not only avoids errors in the connection of pipe sections but also allows subsequent pipe sections to be easily connected to the preceding pipe sections. If the design were reversed, external ground conditions would cause interference, making docking inconvenient.

[0010] Preferably, the horizontal jacking mechanism includes a mounting base, an end face pressing ring for pressing against the end face of the pipe section, and several hydraulic cylinders. One end of each hydraulic cylinder is connected to the mounting base, and the other end abuts against the end face pressing ring. In use, the end face pressing ring presses against the rear end face of the pipe section located in the launching well, and then the hydraulic cylinders extend to achieve the jacking of the pipe section, thus avoiding damage to the end face of the pipe section.

[0011] The invention also includes an inner pressing ring. Each of the four pipe sections of the same segment has one of the aforementioned push rods located on the same vertical plane perpendicular to the center line of the pipe section. The inner pressing ring is used to abut against the four push rods located on the vertical plane of the pipe section closest to the receiving well. The mounting base is provided with several horizontally extending grooves. The hydraulic cylinder is slidably connected within the grooves. The lifting mechanism is detachably connected to the push rods. During pipe section docking, the inner pressing ring is supported to the four push rods located on the same vertical plane at the rearmost end of the pipe section closest to the starting well, which is located within the soil. On the jacking rod, partially retract the hydraulic cylinder, move the retracted hydraulic cylinder to align with the inner pressing ring, then extend it to press against the inner pressing ring. Retract the remaining hydraulic rod pressing against the end pressing ring to avoid it and remove the end pressing ring. Connect the pipe section, place the end pressing ring on the rear end face of the newly connected pipe section, extend the hydraulic cylinder aligned with the end pressing ring to press against the end pressing ring, move the hydraulic rod pressing against the inner pressing ring to press against the end pressing ring, remove the inner pressing ring, and connect the lifting mechanism of the newly connected pipe section to the jacking rod. During the pipe section assembly process, the entire pipe section needs to lose its pressing and jacking force on its end face. Under the influence of soil pressure, the pipe section will exhibit a backward movement towards the starting shaft (the backward movement distance is typically 20 to 30 centimeters). This backward movement disrupts the earth pressure balance between the pipe jacking machine and the soil in front, resulting in unstable soil support and a high risk of soil collapse in front of the jacking head. Without appropriate measures, the settlement of the road surface and pipeline will be difficult to control, and existing technologies have not effectively solved this problem. This technical solution addresses this issue.

[0012] Preferably, two jacking rods are provided on the sidewall of the same pipe section, distributed along the length of the pipe section. Two balance rods, distributed along the width of the pipe section's sidewall, are connected to these jacking rods for supporting the sidewall of the propulsion sleeve. This reduces the number of lifting mechanisms required, freeing up internal space within the pipe section for other construction work.

[0013] Preferably, the push rod has an external port on its circumference that extends through the outer end face of the push rod and communicates with the liquid flow channel. Water can be injected when the push rod is pressed against the propulsion sleeve.

[0014] The present invention has the following advantages: it enables the pipe section to be submerged in water for most of its travel, resulting in less resistance during propulsion; it also effectively prevents soil, especially sand, from entering the propulsion sleeve and hindering the pipe section's advancement; and it facilitates pipe section docking without causing any backward movement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the first two-section pipe segment just after it has been pushed into the ground.

[0016] Figure 2 for Figure 1 A magnified view of a portion at point C;

[0017] Figure 3 A schematic diagram of the pipe section when the propulsion sleeve is in the closed position;

[0018] Figure 4 for Figure 3 A magnified view of a portion of point A;

[0019] Figure 5 A schematic diagram of the pipe section when the propulsion sleeve is in the open position;

[0020] Figure 6 for Figure 5 A magnified view of a portion of point B;

[0021] Figure 7 This is a schematic diagram showing the first two-section pipe being pushed into the soil and the advance sleeve of the preceding pipe section being opened.

[0022] Figure 8 This is a schematic diagram showing the second two-section pipe segment just after it has been pushed into the ground.

[0023] Figure 9 This is a schematic diagram showing the second two-section pipe segment being pushed into the soil, and the propulsion sleeves of the adjacent pipe segment, which is located at the rear and has opened, also opening.

[0024] In the diagram: 1. Pipe jacking machine; 2. Horizontal jacking mechanism; 3. Pipe section; 4. Pipe section sidewall; 5. Large diameter section; 6. Small diameter section; 7. Propeller sleeve; 8. Propeller sleeve sidewall; 9. Rigid sealing structure; 10. Rigid sealing plate; 11. First sealing slot; 42. Second sealing slot; 13. First sealing slot elevation section; 14. First hooking step; 15. Second sealing slot elevation section; 16. Second hooking step; 17. First hook joint; 18. Second hook joint; 19. Rectangle enclosed by the inner surface of the propeller sleeve; 20. Jacking rod; 21. Lifting structure; 22. Fluid flow channel; 23. Inner end of the fluid flow channel. 23. Outer port of the fluid flow channel 24. Cavity 25. Slide cylinder 26. Piston 27. Piston rod 41. Limiting recess 28. Balance bar 29. Fluid injection port 30. Limiting block 31. Mounting seat 32. Inner pressing ring 33. End face pressing ring 34. Hydraulic cylinder 35. Slide groove 36. Launching well 37. Four push rods located on a vertical plane at the rear end of the pipe section closest to the launching well and located in the soil 38. Soil 39. Advancing sleeve of the pipe section located in front 43. Advancing sleeve of the pipe section adjacent to the open advancing sleeve located in front 44. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] See Figures 1 to 9A method for constructing underground tunnels using a pipe jacking system with fluid injection to reduce drag is described. This method utilizes a pipe jacking device, which includes a pipe jacking machine 1, a horizontal jacking mechanism 2, and several pipe sections 3. Each pipe section is a rectangular structure formed by sequentially molding four pipe section sidewalls 4 together end-to-end. Specifically, each pipe section is a precast concrete component. Between adjacent pipe sections, a large-diameter section 5 is located on the inner circumference of the rear end of the pipe section in the forward direction of propulsion, and a small-diameter section 6 is located on the outer circumference of the front end of the pipe section in the backward direction of propulsion. The small-diameter section passes through the large-diameter section, and a propulsion sleeve 7 is fitted inside the pipe section. The propulsion sleeve is formed by four propulsion sleeve sidewalls 8, which are correspondingly placed flat on the sidewalls of four pipe sections. The four propulsion sleeve sidewalls can be separated and connected together. Specifically, two adjacent propulsion sleeve sidewalls of the same propulsion sleeve abut together and are sealed together by a bendable rigid sealing structure 9. The rigid sealing structure includes a bendable rigid sealing piece 10 and a first sealing slot 11 provided on the end face of one propulsion sleeve sidewall and a second sealing slot 42 provided on the end face of the other propulsion sleeve sidewall. The first sealing slot has a first sealing slot portion elevation section 13, and the first sealing slot portion elevation section forms a first sealing slot with the first sealing slot. A hooking step 14 is provided, and a second sealing slot is provided with a second sealing slot portion heightening section 15. A second hooking step 16 is formed between the second sealing slot portion heightening section and the second sealing slot. One end of the rigid sealing sheet passes through the first sealing slot portion heightening section and is provided with a first hook joint 17 that cooperates with the first hooking step. The other end passes through the second sealing slot portion heightening section and is provided with a second hook joint 18 that cooperates with the second hooking condition. The first rigid sealing sheet is slidably and sealingly connected to the first sealing slot and to the second sealing slot. When the propulsion sleeve is in the unfolded state, the rigid sealing sheet is located outside the rectangle 19 enclosed by the inner surface of the propulsion sleeve.

[0027] Two jacking rods 20 are inserted through the sidewall of the pipe section and are distributed along the length of the pipe section. The end of each jacking rod located inside the pipe section is connected to the lifting structure 21. Each jacking rod has a fluid flow channel 22 connecting the inside and outside of the pipe section. The inner port 23 of the fluid flow channel is located inside the pipe section, and the outer port 24 of the fluid flow channel is located on the circumference of the jacking rod and extends through its outer end face. The hole formed underground by the pipe jacking machine is just the right size to accommodate the jacking sleeve in its closed state.

[0028] The lifting structure includes a cavity 25, which has four sliding cylinders 26. A piston 27 is slidably connected within each cylinder. One end of the piston is connected to a piston rod 41, and the other end of the piston rod is connected to the end of a push rod located inside the pipe section. Specifically, a limiting recess 28 is provided on the end face of the piston rod. The push rod passes through the limiting recess and is connected to the piston rod. The piston rod can retract to disengage from the push rod, allowing the lifting structure to be removed. The four piston rods of the same lifting structure are connected one-to-one to a push rod on each of the four pipe section sidewalls. Each of the four pipe section sidewalls of the same pipe section has a push rod located on the same vertical plane perpendicular to the pipe section's centerline. Push rods on the same vertical plane share one lifting structure; therefore, in this embodiment, there are two lifting structures within one pipe section. Two balance rods 29, distributed along the width of the pipe section sidewall, are connected to the push rod for supporting the sidewall of the propulsion sleeve. The cavity has a fluid injection port 30. A limiting stop 31 located inside the pipe section is provided on the push rod.

[0029] The method for opening the propulsion sleeve is as follows: fluid is injected through the fluid inlet, causing the piston rod to extend and lift the push rod. The lifting stops when the push rod reaches the limit stop and abuts against the side wall of the pipe section. At this point, the propulsion sleeve is in the open state and has reached the set requirement. The propulsion sleeve can now pass through when it is in the closed state, with a gap of less than 1 cm between them. Then, water is injected through the liquid flow channel above the propulsion sleeve to maintain its open state. When further movement of the pipe section is required, the push rod retracts, causing the pipe section to move forward while the propulsion sleeve remains stationary.

[0030] The horizontal jacking mechanism includes a mounting base 32, an inner pressing ring 33, an end face pressing ring 34 for pressing against the end face of the pipe section, and several hydraulic cylinders 35. The mounting base is provided with several horizontally extending grooves 36, and one end of each hydraulic cylinder is slidably connected within a groove. During pipe section advancement, the end face pressing ring presses against the rear end face of the pipe section located at the starting well 37, and then the hydraulic cylinders extend to achieve pipe section advancement. During the docking of pipe sections, the inner pressing ring is supported on the four jacking rods 38 located on a vertical plane at the rear end of the pipe section closest to the launching well and situated within the soil. This causes some hydraulic cylinders to retract. The retracted hydraulic cylinders are then moved to align with the inner pressing ring and extended to press against it. The remaining hydraulic rods pressing against the end face pressing ring are retracted to avoid it and to remove the end face pressing ring. The pipe section is then dropped into the launching well and docked with the pipe section pushed into the soil 39. The end face pressing ring is placed on the rear end face of the newly docked pipe section. The hydraulic cylinder aligned with the end face pressing ring is extended to press against it. The hydraulic rods pressing against the inner pressing ring are moved to press against the end face pressing ring. The inner pressing ring is removed, and the lifting mechanism of the newly docked pipe section is connected to the jacking rods.

[0031] The process of underground tunnel pipe jacking construction is as follows: First, under the excavation of the jacking machine and the jacking action of the horizontal jacking mechanism, two pipe sections are advanced through the launching shaft to the rear section, which is then inserted into the ground to a set depth. Second, the propulsion sleeve 43 of the front pipe section is opened and filled with water: the jacking mechanism drives the jacking rod to move a set distance outwards from the pipe section and then stops, causing the propulsion sleeve to open. Water is injected from inside the pipe section through the liquid flow channel of the jacking rod inside the opened pipe section into the space between the propulsion sleeve and the pipe section, keeping the propulsion sleeve open. The jacking rod of the pipe section with the open propulsion sleeve is then retracted. Third, the two pipe sections are then connected: the two pipe sections are passed through the launching shaft one by one... The pipe section enters and connects. Under the excavation of the jacking machine and the jacking action of the horizontal jacking mechanism, the pipe section is inserted for a stroke of two more pipe sections. The jacking sleeve 44 of the pipe section adjacent to the foremost open jacking sleeve is opened. Throughout the insertion process, water is continuously injected through the jacking rod located inside the jacking sleeve of the opened pipe section to maintain pressure and prevent soil from entering the opened jacking sleeve and to maintain a constant opening size of the jacking sleeve. Water injection is stopped when the jacking rod of the opened pipe section moves to the outside of the jacking sleeve. After water injection into the opened pipe section until the jacking sleeve remains open, the jacking rod of the pipe section in the unfolded state is retracted. The third step is repeated until the pipe jacking machine reaches the receiving well. The foremost open jacking sleeve during the first third step is the same as the jacking sleeve of the foremost pipe section in the second step.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A method for constructing underground tunnel pipe jacking systems with a thrust sleeve injection system to reduce drag, characterized in that, This is accomplished using a pipe jacking construction device, which includes a pipe jacking machine, a horizontal jacking mechanism, and several pipe sections. Each pipe section is a rectangular structure formed by four pipe section sidewalls integrally molded end-to-end. A propulsion sleeve is fitted onto each pipe section. The propulsion sleeve is formed by four propulsion sleeve sidewalls that are correspondingly placed horizontally on the four pipe section sidewalls. The four propulsion sleeve sidewalls are detachably connected together. A push rod passes through the pipe section sidewall, pushing against the propulsion sleeve sidewall. One end of the push rod, located inside the pipe section, is connected to the jacking structure. Together, the jacking rod is equipped with a fluid flow channel connecting the inside and outside of the pipe section, and the size of the hole formed underground by the pipe jacking machine is just enough to accommodate the propulsion sleeve in the closed state; the process of underground tunnel pipe jacking construction is as follows: First, under the excavation of the jacking rod machine and the jacking action of the horizontal jacking mechanism, the two pipe sections are pushed into the starting well and advanced to the depth to which the pipe section located behind is inserted into the hole formed underground by the pipe jacking machine; Second, the propulsion sleeve of the pipe section located in front is opened and filled with water: through the jacking structure After the push rod moves a set distance outwards towards the pipe section, it stops, causing the push sleeve to open. Water is then injected from inside the pipe section through the fluid flow channel of the push rod within the opened pipe section into the space between the push sleeve and the pipe section, keeping the push sleeve open. The push rod of the opened pipe section is then retracted. The third step involves connecting two more pipe sections: the two pipe sections are entered one by one through the launching well and connected. Under the digging action of the push rod machine and the jacking action of the horizontal jacking mechanism, the pipe section is inserted for the length of two more pipe sections, connecting the push rod with the foremost pipe section. The propulsion sleeve of the adjacent pipe section opens. Throughout the insertion process, water is continuously injected through the push rod located inside the propulsion sleeve of the pipe section that has been opened to maintain pressure and prevent soil from entering the opened propulsion sleeve and to keep the opening size of the propulsion sleeve constant. Water injection is stopped by moving the push rod of the pipe section that has been opened to the outside of the propulsion sleeve. After water is injected into the pipe section that has been opened until the propulsion sleeve is kept in the open state, the push rod of the pipe section that has been opened is retracted. The third step is repeated until the pipe jacking machine reaches the receiving well.

2. The underground tunnel pipe jacking construction method according to claim 1, characterized in that, The lifting structure includes a cavity with four sliding cylinders. A piston is slidably connected inside each sliding cylinder. One end of the piston is connected to a piston rod, and the other end of the piston rod is connected to the end of the push rod located inside the pipe section. The four piston rods of the same lifting structure are connected one-to-one with a push rod on each of the four side walls of the pipe section. The cavity is provided with a fluid injection port.

3. The underground tunnel pipe jacking construction method with fluid injection to reduce drag in the propulsion sleeve according to claim 2, characterized in that, The piston rod has a limiting recess on its end face, and the push rod passes through the limiting recess and is connected to the piston rod.

4. A method for constructing underground tunnel pipe jacking with a thrust sleeve injection system to reduce drag, as described in claim 1, 2, or 3, characterized in that... The push rod is equipped with a limiting block located inside the pipe section; when the push rod is raised to the point where the limiting block abuts against the inner surface of the pipe section, the push sleeve is in an open state and can be passed through when the push sleeve is in a closed state.

5. A method for constructing underground tunnel pipe jacking with a thrust sleeve injection system to reduce drag, as described in claim 1, 2, or 3, characterized in that... Two adjacent sidewalls of the same propulsion sleeve abut together and are sealed together by a bendable rigid sealing structure. The rigid sealing structure includes a bendable rigid sealing sheet and a first sealing slot on one end face of the sidewall of the two adjacent propulsion sleeves and a second sealing slot on the end face of the other end face. The first sealing slot has a first sealing slot portion elevation section, and a first hooking step is formed between the first sealing slot portion elevation section and the first sealing slot. The second sealing slot has a second sealing slot portion elevation section, and a second hooking step is formed between the second sealing slot portion elevation section and the second sealing slot. One end of the rigid sealing sheet passes through the first sealing slot portion elevation section and has a first hook joint that mates with the first hooking step. The other end passes through the second sealing slot portion elevation section and has a second hook joint that mates with the second hooking step. The first rigid sealing sheet is slidably sealed together with the first sealing slot and slidably sealed together with the second sealing slot. When the propulsion sleeve is in the unfolded state, the rigid sealing sheet is located outside the rectangle enclosed by the inner surface of the propulsion sleeve.

6. A method for constructing underground tunnel pipe jacking with a thrust sleeve injection system to reduce drag, as described in claim 1, 2, or 3, characterized in that... Between adjacent pipe sections, a large-diameter section is provided on the inner circumferential surface of the rear end of the pipe section located in the forward direction, and a small-diameter section is provided on the outer circumferential surface of the front end of the pipe section located in the backward direction, with the small-diameter section passing through the large-diameter section.

7. A method for constructing underground tunnel pipe jacking systems with drag reduction via fluid injection in the propulsion sleeve, as described in claim 1, 2, or 3, characterized in that... The horizontal jacking mechanism includes a mounting base, an end face pressing ring for pressing against the end face of the pipe section, and several hydraulic cylinders. One end of the hydraulic cylinder is connected to the mounting base, and the other end abuts against the end face pressing ring. In use, the end face pressing ring presses against the rear end face of the pipe section located in the starting well, and then the hydraulic cylinder extends to achieve the jacking of the pipe section.

8. A method for constructing underground tunnel pipe jacking with a thrust sleeve injection system to reduce drag, as described in claim 7, is characterized in that... It also includes an inner pressing ring. Each of the four pipe sections of the same segment has a push rod located on the same vertical plane perpendicular to the center line of the pipe section. The inner pressing ring is used to abut against the four push rods located on the vertical plane of the pipe section closest to the receiving well. The mounting base has several horizontally extending grooves, and the hydraulic cylinder is slidably connected within the grooves. The lifting structure is detachably connected to the push rods. When connecting pipe sections, the inner pressing ring is supported by the four push rods located on the same vertical plane at the rearmost end of the pipe section closest to the starting well, which is located within the soil. On the rod, partially retract the hydraulic cylinder, move the retracted hydraulic cylinder to align with the inner pressing ring, then extend it to press against the inner pressing ring. Retract the remaining hydraulic rod pressing against the end pressing ring to avoid it and remove the end pressing ring. Connect the pipe section, place the end pressing ring on the rear end face of the newly connected pipe section, extend the hydraulic cylinder aligned with the end pressing ring to press against the end pressing ring, move the hydraulic rod pressing against the inner pressing ring to press against the end pressing ring, remove the inner pressing ring, and connect the lifting structure of the newly connected pipe section to the push rod.

9. A method for constructing underground tunnel pipe jacking with a thrust sleeve injection system to reduce drag, as described in claim 1, 2, or 3, characterized in that... Two top rods are provided on the side wall of the same pipe section, which are distributed along the length of the pipe section. Two balance rods for supporting the side wall of the propulsion sleeve are connected to the top rods, which are distributed along the width of the side wall of the pipe section.

10. A method for constructing underground tunnel pipe jacking with a thrust sleeve and fluid injection to reduce drag, as described in claim 1, 2, or 3, characterized in that, The circumferential surface of the push rod is provided with an external port that penetrates the outer end face of the push rod and communicates with the liquid flow channel.

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