Method for carrying out pipe jacking construction through rollback type pipe jacking system

Abstract

The invention relates to a method for pipe jacking construction through a retreating type pipe jacking system, which comprises the following steps of: 1, forming pipe joint mounting holes for accommodating pipe joints through a pipe jacking machine, and 2, jacking the pipe joints into the pipe joint mounting holes one by one through a horizontal jacking mechanism in the forming process of the pipe joint mounting holes until all the pipe joints are mounted; in the tunneling process of the pipe jacking machine, when the temperature of a tool bit reaches the set temperature T1, the horizontal jacking mechanism maintains the current state and starts the hydraulic station, the hydraulic station drives the connecting oil cylinder to extend so as to drive the tunneling head to advance, and after the connecting oil cylinder extends to the set length, the hydraulic station drives the connecting oil cylinder to contract so that the tunneling head can retreat and reset so as to stop continuous tunneling; and when the temperature of the tool bit reaches the set temperature T2, the tunneling head continues tunneling, and the pipe joint is jacked through the horizontal jacking mechanism. The pipe-jacking construction tool bit has the advantage that the tool bit and a soil body can be in a separated state for cooling, and the problem that an existing pipe-jacking construction tool bit is embedded in the soil body for cooling, so that the tool bit is damaged due to secondary starting is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground tunnel construction, and in particular to a method for performing pipe jacking construction through a retractable pipe jacking system. Background Art

[0002] During construction projects, underground tunnels (including pipelines) require construction. Existing tunnel construction methods include shield tunneling, blasting, open-cut tunneling, and pipe jacking. Pipe jacking is a trenchless construction method, a technique for laying pipelines or tunnels without or with minimal excavation. Pipe jacking involves using the jacking force generated by jacking equipment within a working pit to overcome friction between the pipeline and the surrounding soil, pushing the pipeline into the soil according to the designed slope, and removing the soil. After one pipe section is pushed into the soil, the second section is lowered and pushed forward. The principle is to use the thrust of the main jacking cylinder and other equipment such as pipe and relay rooms to push the pipe section or tunnel boring machine (pipe jacking machine) from the launch shaft through the soil and hoist it into the receiving shaft. The pipeline follows the pipe jacking machine and is buried between the two pits. Pipe jacking is the optimal construction method when open-cut construction is impractical due to interfering structures on the ground, and the tunnel is small (pipe jacking does not fall under rock geology). There are the following shortcomings in pipe jacking construction: when the cutter head heats up and exceeds the set temperature, the cutter head stops working, and the cutter head is driven to advance when the temperature drops to meet the requirements. However, since the pipe jacking machine cannot move backward, the cutter head is still embedded in the soil when it stops, and the cutter head is severely damaged when it is started again. During winter construction in cold areas, the resistance-reducing slurry (which can be mud) used to reduce resistance is prone to freezing and loss of fluidity, which can easily cause a sudden increase in jacking resistance, pipe jamming, or even inability to advance. Summary of the Invention

[0003] The first purpose of the present invention is to provide a method for pipe jacking construction through a retractable pipe jacking system, which can separate the cutter head from the soil for cooling, thereby solving the problem that the existing pipe jacking construction cutter head is embedded in the soil for cooling, resulting in secondary startup and damage to the cutter head.

[0004] The second object of the present invention is to further provide a method for pipe jacking construction through a retractable pipe jacking system that can prevent the resistance-reducing slurry from freezing on the pipe segment, thereby solving the problem that the existing pipe jacking construction cannot be carried out due to freezing in winter.

[0005] The above technical problems are solved by the following technical solutions: a method for pipe jacking construction by a retractable pipe jacking system, the retractable pipe jacking system includes a pipe jacking machine, a horizontal jacking mechanism and a plurality of pipe segments for sequentially docking together to form a channel, the pipe jacking machine includes a hydraulic station, a tunneling head and a base pipe sleeved on the rear end of the tunneling head, the rear end of the base pipe is provided with a small diameter section with a reduced inner diameter to form a support step, the tunneling head is supported on the support step by a plurality of connecting cylinders distributed along the circumference of the base pipe, and the connecting cylinders are connected to the hydraulic station; the construction process is: the first step, the pipe jacking machine is made to enter one end of the area where the pipeline needs to be formed and enter the pipe segment installation area to form a pipe segment Hole, the second step, during the process of forming the pipe segment installation hole, the pipe segments are pushed into the pipe segment installation hole one by one through the horizontal jacking mechanism until all the pipe segments are installed. During the process of pipe segment jacking, a resistance-reducing slurry is injected between the pipe segment and the wall of the pipe segment installation hole to reduce resistance. During the excavation of the pipe jacking machine, when the temperature of the cutter head reaches the set temperature T1, the horizontal jacking mechanism maintains the current state and starts the hydraulic station. The hydraulic station drives the connecting cylinder to extend and drives the excavation head forward. After the connecting cylinder extends to the set length, the hydraulic station drives the connecting cylinder to retract, causing the excavation head to retreat and reset, and stop further excavation. When the temperature of the cutter head reaches the set temperature T2, the excavation head continues to excavate and push the pipe segment through the horizontal jacking mechanism. This method, because the pipe jacking machine can retreat, retreating when the temperature drops, separates the cutter head from the soil, thereby avoiding damage to the cutter head during the second start and the problem of high power required for startup.

[0006] Preferably, a sealing ring is further included. The outer diameter of the base pipe is larger than the outer diameter of the pipe segment, the outer diameter of the base pipe is larger than the diameter of the hole dug by the tunneling head, the outer diameter of the sealing end ring is larger than the outer diameter of the base pipe, and the inner diameter is equal to the outer diameter of the pipe segment. A resistance-reducing slurry input channel is provided in the base pipe, connecting the inner circumference of the base pipe and the rear end face of the base pipe. The outlet end of the resistance-reducing slurry input channel is located at a portion of the rear end face of the base pipe that exceeds the pipe segment. The inlet end of the resistance-reducing slurry input channel is connected to a slurry input pipe. The sealing ring is pressed against the inlet end of the pipe segment mounting hole by the horizontal jacking mechanism to prevent the resistance-reducing slurry from flowing out of the pipe segment mounting hole. This allows the pipe jacking machine to compact the wall of the pipe segment mounting hole when it moves forward, thereby better preventing the resistance-reducing slurry from spreading. The independent provision of the sealing end ring to prevent the resistance-reducing slurry from flowing out can prevent the resistance-reducing slurry from leaking during the process of adding pipe segments.

[0007] Preferably, the outlet end of the drag-reducing slurry input channel is located at the lower end of the rear end surface of the base pipe, which can more reliably prevent the pipe segment from excessively sinking during the injection of the drag-reducing slurry.

[0008] Preferably, the front end surface of the base pipe is a conical surface with a larger rear end and a smaller front end, so that the pipe jacking machine can be pushed forward more labor-savingly.

[0009] Preferably, the front end of the pipe segment is provided with a small-diameter pipe segment on its outer circumference, the rear end is provided with a large-diameter pipe segment on its inner circumference, and the rear end of the base pipe is provided with a large-diameter base pipe segment on its inner circumference. The horizontal jacking mechanism includes a mounting seat, a pressing ring for pressing on the pipe segment end face, and a plurality of hydraulic cylinders, one end of the hydraulic cylinder being connected to the mounting seat and the other end pressing on the rear end of the pressing ring. The front end of the pressing ring is provided with a small-diameter pressing ring segment on its outer circumference. The small-diameter pipe segment of the frontmost pipe segment is inserted into the large-diameter base pipe segment, and the large-diameter pipe segment of the rearmost pipe segment is sleeved on the small-diameter pressing ring segment. Between adjacent pipe segments, the small-diameter pipe segment of the rearmost pipe segment is inserted into the large-diameter pipe segment of the frontmost pipe segment. This facilitates maintaining the pipe segments suspended and centered.

[0010] Preferably, a small-diameter base pipe section is provided on the outer circumferential surface of the rear end of the base pipe. The outer diameter of the small-diameter base pipe section is larger than the outer diameter of the pipe segment. A grouting chamber is provided within the base pipe. A plurality of grouting outlets are provided on the outer circumferential surface of the small-diameter base pipe section, distributed along the circumference of the base pipe. The grouting outlets are connected to the grouting chamber via grouting pipes. During the advancement of the pipe jacking machine, waterproof slurry is injected from the grouting chamber and ejected from the grouting outlets. The ejected waterproof slurry solidifies on the wall of the pipe segment mounting hole to form a waterproof layer, forming a resistance-reducing slurry storage chamber between the waterproof layer and the pipe segment. This can more reliably prevent the diffusion of the resistance-reducing slurry.

[0011] Preferably, the pipe segment includes an inner tube and a heat exchange outer tube rotatably mounted on the inner tube, a heating chamber surrounded by the heat exchange outer tube and the heat exchange inner tube, the heating chamber is provided with a heating liquid inlet hole and a heating liquid outlet hole penetrating the inner circumference of the inner tube, the inner circumference of the outer tube is provided with a plurality of blades extending radially along the circumference of the outer tube, the blades are evenly distributed along the circumference of the outer tube, the blades divide the heating chamber into a plurality of sealed chambers distributed along the circumference of the outer tube, when the liquid flow is input into the sealed chamber, the pressure generated at one end face of the sealed chamber along the circumference of the outer tube is less than the pressure generated at the other end face, the spacing between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner tube is L1, the length of the sealed chamber along the circumference of the inner tube is L2, L2<L1<2 In the second step, heating liquid at a set pressure is fed through the heating liquid inlet of the pipe joint, which enters the pipe joint installation hole, thereby driving the outer pipe to rotate. Finally, the heating liquid is discharged through the heating liquid outlet. As the heating liquid flows through the heating chamber, it heats the resistance-reducing slurry to prevent it from freezing on the outer pipe and interfering with the pipe joint's insertion. This allows pipe jacking to be carried out even in cold winter temperatures, preventing the pipe joint from being blocked due to freezing.

[0012] Preferably, one end surface of the sealing cavity along the circumference of the outer tube is a plane perpendicular to the axis of the outer tube, and the other end surface is an inclined surface. A technical solution for driving the rotation by upper and lower pressure differences is provided.

[0013] Preferably, the outer peripheral surface of the outer tube is provided with a plurality of heat exchange fins distributed axially along the circumference of the outer tube, which can improve the effect of heating the resistance-reducing slurry to prevent freezing.

[0014] Preferably, a barb groove is formed between the heat exchange fin and the outer surface of the outer tube, and the barb groove is located at the rear end of the outer tube in the direction of rotation driven by the heating liquid, so as to more reliably ensure the reliability of the one-way driving of the outer tube when the heating liquid flows in.

[0015] Preferably, the inner tube is an insulating structure. In winter, there is geothermal heat underground, and the cold energy mainly comes from the air. This technical solution can better prevent the resistance-reducing slurry from freezing.

[0016] The present invention has the following advantages: it can effectively prevent the resistance reducing slurry from freezing; it has a good effect in preventing the resistance reducing slurry from spreading, and there is little obstruction during advancement; the pipe jacking machine can retreat, and the cutter head can be cooled in a state separated from the soil, the cutter head is not easily damaged during the second start-up, and the increased power is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the pipe jacking machine in Example 1 just entering the pipe jacking installation area; Figure 2 This is a schematic diagram of the pipe jacking machine in Example 2 just entering the pipe jacking installation area; Figure 3 for Figure 2 A local enlarged schematic diagram of point A; Figure 4 This is a schematic diagram of the installation of two pipe sections in Example 2; Figure 5 is a schematic cross-sectional view of the pipe segment in Example 2; Figure 6 for Figure 5 A local enlarged schematic diagram of point B; Figure 7 for Figure 4 A local enlarged schematic diagram of point C.

[0018] In the figure: pipe jacking machine 1, horizontal jacking mechanism 2, pipe joint 3, inner pipe 4, heat exchange outer pipe 5, heating chamber 6, heating liquid inlet hole 7, heating liquid outlet hole 8, blade 9, sealing chamber 10, resistance reduction slurry 11, the distance between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner pipe is L1, the length of the sealing chamber along the circumference of the inner pipe is L2, one end surface of the sealing chamber along the circumference of the outer pipe 12, the other end surface of the sealing chamber along the circumference of the outer pipe 13, heat exchange fin 14, hook groove 15, sealing Plugging ring 16, base pipe 17, front end face of base pipe 18, small diameter section of base pipe 19, grouting chamber 20, slurry outlet 21, grouting pipe 22, resistance reduction slurry input channel 23, small diameter section 2 of pipe segment, large diameter section 25 of pipe segment, large diameter section 26 of base pipe, mounting seat 27, pressing ring 28, hydraulic cylinder 29, small diameter section of pressing ring 30, waterproof layer 31, hydraulic station 32, tunneling head 33, support step 34, slurry input pipe 35, connecting cylinder 36. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1, see Figure 1 A method for pipe jacking construction using a retractable pipe jacking system is disclosed. The retractable pipe jacking system includes a pipe jacking machine 1, a horizontal jacking mechanism 2, and several pipe segments 3 that are sequentially connected together to form a channel. The pipe jacking machine includes a hydraulic station 32, a tunneling head 33, and a base pipe 17 mounted on the rear end of the tunneling head. The rear end of the base pipe is provided with a smaller diameter section with a reduced inner diameter, forming a support step 34. The tunneling head is supported on the support step by several connecting cylinders 36 distributed along the circumference of the base pipe. The connecting cylinders are connected to the hydraulic station. A large diameter section 26 of the base pipe is provided on the inner circumference of the rear end of the base pipe. The horizontal jacking mechanism includes a mounting seat 27, a pressing ring 28 for pressing against the end face of the pipe segment, and several hydraulic cylinders 29. One end of the hydraulic cylinder is connected to the mounting seat, and the other end presses against the rear end of the pressing ring. The outer circumference of the front end of the pressing ring is provided with a smaller diameter section 30. During tunneling, the horizontal jacking mechanism presses against the rear end of the base pipe. The outer diameter of the base pipe is larger than the outer diameter of the pipe section. The front end face 18 of the base pipe is a tapered surface with a larger rear end and a smaller front end. The front end face of the base pipe is a tapered surface with a larger rear end and a smaller front end.

[0021] The construction process is as follows: first, the pipe jacking machine is put into one end of the area where the pipeline needs to be formed to form the pipe segment installation hole; second, in the process of forming the pipe segment installation hole, the pipe segments are pushed into the pipe segment installation hole one by one through the horizontal jacking mechanism until all the pipe segments are installed. During the process of jacking the pipe segments, a resistance reducing slurry 11 is injected between the pipe segment and the hole wall of the pipe segment installation hole (see Figure 3 ); During the tunneling process of the pipe jacking machine, when the temperature of the cutter head reaches the set temperature T1, the horizontal jacking mechanism maintains the current state and starts the hydraulic station. The hydraulic station drives the connecting cylinder to extend and drives the tunneling head forward. After the connecting cylinder extends to the set length, the hydraulic station drives the connecting cylinder to contract and the tunneling head retreats and resets to stop tunneling; when the temperature of the cutter head reaches the set temperature T2, T1>T2, the tunneling head continues to tunnel and jacks the pipe section through the horizontal jacking mechanism.

[0022] The second embodiment is different from the first embodiment in that: See also Figures 2 to 7 The pipe segment includes an inner tube 4 and a heat exchange outer tube 5 rotatably mounted on the inner tube. A heating chamber 6 is formed between the heat exchange outer tube and the heat exchange inner tube and is wrapped around the inner tube. The inner tube is a heat-insulating structure. The heating chamber is provided with a heating liquid inlet hole 7 and a heating liquid outlet hole 8 that pass through the inner circumference of the inner tube. The inner circumference of the outer tube is provided with a plurality of blades 9 that extend radially along the circumference of the outer tube. The blades are evenly distributed along the circumference of the outer tube and divide the heating chamber into a plurality of sealed chambers 10 distributed along the circumference of the outer tube. When liquid flows into the sealed chamber, the pressure generated at one end face of the sealed chamber along the circumference of the outer tube is less than the pressure generated at the other end face. The distance between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner tube is L1, and the length of the sealed chamber along the circumference of the inner tube is L2, where L2 < L1 < 2 L2. The end face 12 of the sealed chamber along the circumference of the outer tube is a plane passing through the axis of the outer tube, and the end face 13 at the other end is an inclined surface. The outer surface of the outer tube is provided with a plurality of heat exchange fins 14 extending axially along the outer tube circumference. A barb groove 15 is formed between the heat exchange fins and the outer surface of the outer tube. The barb groove is located at the rear end of the outer tube in the direction of rotation driven by the heating liquid.

[0023] It also includes a sealing ring 16. The outer diameter of the sealing end ring is larger than the outer diameter of the base pipe, and the inner diameter is equal to the outer diameter of the pipe segment. A base pipe section 19 is provided on the outer peripheral surface of the rear end of the base pipe. The outer diameter of the base pipe section is larger than the outer diameter of the pipe segment. A grouting chamber 20 is provided in the base pipe. A plurality of slurry outlets 21 are provided on the outer peripheral surface of the base pipe section, distributed along the circumference of the base pipe. The slurry outlets are connected to the grouting chamber through grouting pipes 22. During the advancement of the pipe jacking machine, waterproof slurry is injected from the grouting chamber and sprayed out from the slurry outlets. The sprayed waterproof slurry solidifies on the wall of the pipe segment installation hole to form a waterproof layer 31. A resistance-reducing slurry storage chamber is formed between the waterproof layer and the pipe segment. A resistance-reducing slurry input channel 23 is provided in the base pipe, connecting the inner peripheral surface of the base pipe and the rear end face of the base pipe. The outlet end of the resistance-reducing slurry input channel is located at a portion of the rear end face of the base pipe that exceeds the pipe segment. The inlet end of the resistance-reducing slurry input channel is connected to a slurry input pipe 35. The sealing ring is pressed by the horizontal jacking mechanism on the inlet end of the pipe segment installation hole to prevent the resistance reducing slurry from flowing out of the pipe segment installation hole. The outlet end of the resistance reducing slurry input channel is located at the lower end of the base pipe. A pipe segment small diameter section 24 is provided on the outer circumference of the front end of the pipe segment, and a pipe segment large diameter section 25 is provided on the inner circumference of the rear end. During construction, the pipe segment small diameter section of the pipe segment at the front end is inserted into the large diameter section of the base pipe, and the pipe segment large diameter section of the pipe segment at the rear end is sleeved on the pressing ring small diameter section; between adjacent pipe segments, the pipe segment small diameter section of the pipe segment at the rear end is inserted into the pipe segment large diameter section of the pipe segment at the front end. In the second step, heating liquid with a set pressure is input through the heating liquid inlet of the pipe joint that enters the pipe joint installation hole to drive the outer pipe to rotate. Finally, the heating liquid is output from the heating liquid outlet. In the process of the heating liquid flowing through the heating chamber, the resistance reducing slurry is heated to prevent the resistance reducing slurry from freezing on the outer pipe and interfering with the insertion of the pipe joint.

[0024] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for pipe jacking construction using a retractable pipe jacking system, characterized in that: The retractable pipe jacking system includes a pipe jacking machine, a horizontal jacking mechanism and a plurality of pipe segments that are sequentially connected together to form a channel. The pipe jacking machine includes a hydraulic station, a boring head and a base pipe sleeved on the rear end of the boring head. The rear end of the base pipe is provided with a small diameter section with a reduced inner diameter to form a support step. The boring head is supported on the support step by a plurality of connecting oil cylinders distributed along the circumference of the base pipe. The connecting oil cylinders are connected to the hydraulic station. The construction process is as follows: the first step is to make the pipe jacking machine enter the area where the pipeline needs to be formed and enter the pipe segment installation hole to form the pipe segment. The second step is to place the pipe segment in the process of forming the pipe segment installation hole. The pipes are pushed into the pipe segment installation holes one by one through the horizontal jacking mechanism until all the pipe segments are installed. During the process of jacking the pipe segments, a resistance-reducing slurry is injected between the pipe segment and the wall of the pipe segment installation hole. During the tunneling process of the pipe jacking machine, when the temperature of the cutter head reaches the set temperature T1, the horizontal jacking mechanism maintains the current state and starts the hydraulic station. The hydraulic station drives the connecting cylinder to extend and drives the tunneling head forward. After the connecting cylinder extends to the set length, the hydraulic station drives the connecting cylinder to contract, causing the tunneling head to retreat and reset, and stop tunneling. When the temperature of the cutter head reaches the set temperature T2, the tunneling head continues to tunnel and jack the pipe segment through the horizontal jacking mechanism.

2. A method for pipe jacking construction using a retractable pipe jacking system according to claim 1, characterized in that: It also includes a sealing plugging ring, the outer diameter of the base pipe is larger than the outer diameter of the pipe segment, the outer diameter of the base pipe is larger than the aperture of the hole dug by the tunneling head, the outer diameter of the sealing end ring is larger than the outer diameter of the base pipe, and the inner diameter is equal to the outer diameter of the pipe segment, and a resistance-reducing slurry input channel connecting the inner circumferential surface of the base pipe and the rear end face of the base pipe is provided in the base pipe, the outlet end of the resistance-reducing slurry input channel is located at a portion of the rear end face of the base pipe that exceeds the pipe segment, the inlet end of the resistance-reducing slurry input channel is connected to a slurry input pipe, and the sealing plugging ring is pressed against the inlet end of the pipe segment mounting hole by the horizontal jacking mechanism to prevent the resistance-reducing slurry from flowing out of the pipe segment mounting hole.

3. A method for pipe jacking construction using a retractable pipe jacking system according to claim 2, characterized in that: The outlet end of the resistance-reducing slurry input channel is located at the lower end of the rear end surface of the base pipe.

4. A method for pipe jacking construction using a retractable pipe jacking system according to claim 2 or 3, characterized in that: The front end surface of the base pipe is a conical surface with a larger rear end and a smaller front end.

5. A method for pipe jacking construction using a retractable pipe jacking system according to claim 1, 2 or 3, characterized in that: A small-diameter section of a pipe joint is provided on the outer circumferential surface of the front end of the pipe joint, and a large-diameter section of a pipe joint is provided on the inner circumferential surface of the rear end. A large-diameter section of a base pipe is provided on the inner circumferential surface of the rear end of the base pipe. The horizontal jacking mechanism includes a mounting seat, a pressing ring for pressing on the end face of the pipe joint, and a plurality of hydraulic cylinders. One end of the hydraulic cylinder is connected to the mounting seat, and the other end presses on the rear end of the pressing ring. A small-diameter section of a pressing ring is provided on the outer circumferential surface of the front end of the pressing ring. The small-diameter section of the pipe joint of the pipe joint at the front end is passed through the large-diameter section of the base pipe, and the large-diameter section of the pipe joint of the pipe joint at the rear end is sleeved on the small-diameter section of the pressing ring. Between adjacent pipe joints, the small-diameter section of the pipe joint of the rear pipe joint is passed through the large-diameter section of the pipe joint of the front pipe joint.

6. A method for pipe jacking construction using a retractable pipe jacking system according to claim 1, 2 or 3, characterized in that: A small-diameter section of the base pipe is provided on the outer circumferential surface of the rear end of the base pipe, and the outer diameter of the small-diameter section of the base pipe is larger than the outer diameter of the pipe segment. A grouting chamber is provided in the base pipe, and a plurality of slurry outlets distributed along the circumference of the base pipe are provided on the outer circumferential surface of the small-diameter section of the base pipe, and the slurry outlets are connected to the grouting chamber through grouting pipes; during the advancement of the pipe jacking machine, waterproof slurry is injected from the grouting chamber and sprayed out from the slurry outlet, and the sprayed waterproof slurry solidifies on the wall of the pipe segment installation hole to form a waterproof layer, and a resistance-reducing slurry storage cavity is formed between the waterproof layer and the pipe segment.

7. The method for pipe jacking construction using a retractable pipe jacking system according to claim 1, characterized in that: The pipe segment includes an inner tube and a heat exchange outer tube rotatably mounted on the inner tube. A heating chamber is formed between the heat exchange outer tube and the heat exchange inner tube and is surrounded by the inner tube. The heating chamber is provided with a heating liquid inlet hole and a heating liquid outlet hole which pass through the inner circumference of the inner tube. The inner circumference of the outer tube is provided with a plurality of blades which extend radially along the circumference of the outer tube. The blades are evenly distributed along the circumference of the outer tube. The blades divide the heating chamber into a plurality of sealed chambers distributed along the circumference of the outer tube. When the liquid flows into the sealed chamber, the pressure generated at one end face of the sealed chamber along the circumference of the outer tube is less than the pressure generated at the other end face. The spacing between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner tube is L1, and the length of the sealed chamber along the circumference of the inner tube is L2, L2<L1<2 L2; In the second step, a heating liquid with a set pressure is input through the heating liquid inlet hole of the pipe segment that enters the pipe segment installation hole to drive the outer tube to rotate, and finally the heating liquid is output from the heating liquid outlet hole. During the heating liquid flowing through the heating chamber, the resistance reducing slurry is heated to prevent the resistance reducing slurry from freezing on the outer tube and interfering with the top insertion of the pipe segment.

8. The method for pipe jacking construction using a retractable pipe jacking system according to claim 7, characterized in that: One end surface of the sealing cavity along the circumference of the outer tube is a plane perpendicular to the axis of the outer tube, and the other end surface is an inclined surface.

9. A method for pipe jacking construction using a retractable pipe jacking system according to claim 7 or 8, characterized in that: A plurality of heat exchange fins are provided on the outer peripheral surface of the outer tube and are distributed axially along the circumference of the outer tube.

10. A method for pipe jacking construction using a retractable pipe jacking system according to claim 9, characterized in that: A barb groove is formed between the heat exchange plate and the outer surface of the outer tube, and the barb groove is located at the rear end of the outer tube in the rotation direction driven by the heating liquid.

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