A method for detecting water and soil pressure in pipe jacking process

Abstract

This invention provides a method for detecting water and soil pressure during pipe jacking. A pore water pressure detection mechanism is integrated into the wall of the pipe section to detect the water pressure inside the pipe jacking installation hole and transmits the detected data to a data processing unit for display and storage. The pore water pressure mechanism includes an installation sleeve and a pore water pressure sensor. The water and soil pressure detection process is as follows: during the advancement of the pipe section, the water and soil pressure inside the pipe jacking installation hole is detected by the water and soil pressure sensor; the detected water and soil pressure value of the pipe jacking installation hole is displayed on a monitor; and the real-time status of the water and soil pressure value of the pipe jacking installation hole is obtained by observing the water and soil pressure value. This invention has the advantage of being able to obtain water and soil pressure in real time during pipe jacking, solving the problem of not being able to obtain real-time water and soil pressure data during pipe jacking.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction monitoring technology, and in particular to a method for detecting water and soil pressure during the pipe jacking process. Background Technology

[0002] Pipe jacking, a key trenchless construction technology in municipal pipelines and integrated utility tunnels, relies on a jacking device in the starting shaft to propel the pipe along its designed axis towards the receiving shaft, while grout is injected between the pipe's outer perimeter and the soil wall to form a support layer. During construction, accurately understanding the real-time state of the original soil layer outside the pipe is crucial. This includes the actual distance between the pipe and the undisturbed soil, soil structural characteristics such as looseness or obstacle distribution, and the distribution of water and soil pressure acting on the pipe surface. These data directly affect the dynamic adjustment of key parameters such as jacking thrust and grouting pressure, providing a fundamental guarantee for preventing ground subsidence and mitigating construction risks. However, current monitoring practices face multiple severe challenges: construction companies mainly rely on preliminary geological data or internal jacking parameters for indirect extrapolation, or obtain delayed feedback through surface subsidence monitoring. These methods cannot provide in-situ direct data at the pipe-soil interface, leading to information distortion and slow response. The extreme nature of jacking conditions further exacerbates the technical bottleneck; high-intensity friction and compression easily damage conventional exposed sensors. Existing testing methods rely on laboratory simulations and cannot continuously collect water and soil pressure data in real time to determine whether the pipe jacking design meets construction requirements.

[0003] Furthermore, due to environmental influences during the application of the grout, it is impossible to know whether it meets the requirements. Parameters can only be set based on simulation data provided by the laboratory, without on-site testing and feedback for adjustment to ensure that the actual parameters better meet the construction requirements. Summary of the Invention

[0004] The first objective of this invention is to provide a method for detecting soil and water pressure during pipe jacking that can obtain real-time soil and water pressure data during the pipe jacking process, thus solving the problem of not being able to obtain real-time soil and water pressure data during pipe jacking.

[0005] The second objective of this invention is to provide a method for detecting soil and water pressure during pipe jacking that enables real-time slurry sampling, thereby solving the problem of not being able to sample slurry in real time during pipe jacking construction.

[0006] The above technical problems are solved by the following technical solution: a method for detecting water and soil pressure during pipe jacking, wherein the pipe jacking process includes excavating a pipe jacking installation hole using a tunneling head, then simultaneously pushing the pipe jacking sections from the starting shaft to the receiving shaft into the installation hole using a jacking device, all pipe jacking sections being joined together to form a jacking pipe, and injecting grout into the installation hole during the pipe jacking process to form a lubrication layer to reduce the resistance during the pipe jacking process, characterized in that a pore water pressure detection mechanism is integrated on the wall of the pipe jacking section to detect the water pressure in the installation hole and transmit the detected data to a data processing unit for display and storage; the pore water pressure mechanism includes The system includes an installation sleeve and a pore water pressure sensor. The front end of the installation sleeve has an external thread section, which is a solid structure. The external thread section is sealed and threaded into a threaded mounting hole on the wall of the jacking pipe section. The pore water pressure sensor is installed on the end face of the external thread section. The communication cable of the pore water pressure sensor passes through the external thread section and the installation sleeve and is connected to the data processing unit. The process of water and soil pressure detection is as follows: during the advancement of the jacking pipe section, the water and soil pressure in the jacking pipe mounting hole is detected by the water and soil pressure sensor. The detected water and soil pressure value of the jacking pipe mounting hole is displayed on the monitor, and the real-time status of the water and soil pressure value of the jacking pipe mounting hole is obtained by observing the water and soil pressure value.

[0007] Preferably, the outer end of the threaded mounting hole is provided with a plug, the outer end face of the plug is located on the same cylindrical surface as the outer circumferential surface of the jacking pipe section, the plug is provided with several water-permeable holes, and the pore water pressure sensor is located inside the plug.

[0008] Preferably, the opening area of ​​the permeable hole gradually increases from the outer end to the inner end.

[0009] Preferably, the outer end of the internally threaded hole is provided with an inner flange to form a small diameter section, the plug is installed in the small diameter section, a gap is provided between the externally threaded section and the inner flange, and the detection end of the pore water pressure sensor passes through the small diameter section.

[0010] Preferably, the system also includes a slurry sampling mechanism. This mechanism comprises a sliding hole on the inner end face of the mounting sleeve, a sliding rod slidably connected within the sliding hole, a transparent slurry storage pipe located inside the jacking pipe body and connected to the sliding hole via a connecting channel, a compression spring driving the sliding rod to move outwards towards the jacking pipe section, and a connecting channel opening structure driving the sliding rod to move inwards towards the jacking pipe section. The sliding hole penetrates the external threaded section, and the slurry storage pipe has a slurry discharge port with a cap. This system enables sampling and allows for grouting through the slurry storage pipe to clear the permeable holes.

[0011] Preferably, the diameter of the mounting sleeve is larger than the diameter of the external thread section to form a pressing step, and a sealing ring is fitted on the external thread section. The pressing step presses the sealing ring against the inner circumferential surface of the jacking pipe section, thereby sealing the mounting sleeve with the inner circumferential surface of the jacking pipe section.

[0012] Preferably, the system also includes a slurry sampling mechanism. This mechanism comprises a sliding hole on the inner end face of the mounting sleeve, a sliding rod slidably connected within the sliding hole, a transparent slurry storage tube located inside the jacking pipe body and connected to the sliding hole via a connecting channel, a compression spring driving the sliding rod to move outwards towards the jacking pipe section, and a connecting channel opening structure driving the sliding rod to move inwards towards the jacking pipe section. The slurry storage tube has a slurry discharge port, and the discharge port has a cap. During sampling, the sliding rod moves inwards towards the jacking pipe section under the action of the opening structure, allowing the connecting channel to connect with the jacking pipe mounting hole via the sliding hole. Slurry from the jacking pipe mounting hole enters the slurry storage tube. The appearance and color of the slurry are observed through the storage tube to ensure it meets requirements. The opening of the slurry tube is then closed. At this point, the sliding rod returns to its original position under the action of the compression spring, closing the connecting channel. The cap is removed, allowing the slurry in the slurry tube to drain into the sampling tube, which is then taken to the laboratory for further compositional analysis. This completes one sampling operation, enabling online sampling of injected slurry.

[0013] Preferably, the slide rod is a ferromagnetic structure, the sliding hole is a blind hole, and the opening structure of the connecting channel is an electromagnet for attracting the slide rod, the electromagnet being fixed to the inner end face of the mounting sleeve. This achieves contactless driving of the slide rod, the driving force can be easily adjusted, and eliminates the need for sealing the inner end of the sliding hole.

[0014] Beneficial effects: It can detect water and soil pressure in real time during pipe jacking construction and can sample mud in real time. Attached Figure Description

[0015] Figure 1 A schematic diagram showing the operational status of a pore water pressure testing mechanism; Figure 2 yes Figure 1 A magnified view of a portion of point A; Figure 3 yes Figure 1 A magnified view of a portion of point B.

[0016] In the diagram: 1. Jacking pipe mounting hole; 2. Jacking pipe section; 3. Grout; 4. Mounting sleeve; 5. Pore water pressure detection mechanism; 6. Pore water pressure sensor; 7. External thread section; 8. Threaded mounting hole; 9. Communication cable of pore water pressure sensor; 10. Plug; 11. Outer end face of plug; 12. Water permeable hole; 13. Sealing ring; 14. Small diameter section; 15. Gap; 18. Sliding hole; 19. Sliding rod; 20. Connecting channel; 21. Grout storage pipe; 22. Compression spring; 23. Opening structure of connecting channel; 24. Hole cover. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0018] See Figures 1 to 3 A method for detecting water and soil pressure during pipe jacking is disclosed. The pipe jacking process includes excavating a pipe mounting hole 1 for installing pipe sections using a tunneling head, and then simultaneously pushing pipe sections 2 from the starting shaft to the receiving shaft into the pipe mounting hole using a jacking device. All pipe sections are joined together to form a jacking pipe. During the pipe section jacking process, grout 3 is injected into the pipe mounting hole to form a lubrication layer to reduce the resistance during pipe section jacking. A pore water pressure detection mechanism 5 is integrated on the wall of the pipe section to detect the water pressure in the pipe mounting hole and transmit the detected data to a data processing unit for display and storage. The pore water pressure mechanism includes a mounting sleeve 4 and a pore water pressure sensor 6. The front end of the mounting sleeve has an external thread section 7, which is a solid structure. The external thread section is sealed and threaded into a threaded mounting hole 8 on the wall of the pipe section. The pore water pressure sensor is installed on the end face of the external thread section. The communication cable 9 of the pore water pressure sensor passes through the external thread section and the mounting sleeve and is connected to the data processing unit.

[0019] A plug 10 is provided at the outer end of the threaded mounting hole, and the outer end face 11 of the plug is located on the same cylindrical surface as the outer circumferential surface of the jacking pipe section. The plug has several water-permeable holes 12, and the pore water pressure sensor is located inside the plug. The opening area of ​​the water-permeable holes gradually increases from the outer end to the inner end. The diameter of the mounting sleeve is larger than the diameter of the external threaded section to form a pressing step. A sealing ring 13 is fitted on the external threaded section, and the pressing step presses the sealing ring against the inner circumferential surface of the jacking pipe section, so that the mounting sleeve is sealed to the inner circumferential surface of the jacking pipe section. The outer end of the internal threaded hole has an inward flange to form a small diameter section 14. The plug is installed in the small diameter section, and a gap 15 is provided between the external threaded section and the inward flange. The detection end of the pore water pressure sensor passes through the small diameter section.

[0020] The process of conducting water and soil pressure detection is as follows: during the advancement of the pipe jacking section, the water and soil pressure in the pipe jacking installation hole is detected by the water and soil pressure sensor, the detected water and soil pressure value of the pipe jacking installation hole is displayed on the monitor, and the real-time status of the water and soil pressure value of the pipe jacking installation hole is obtained by observing the water and soil pressure value.

[0021] It also includes a slurry sampling mechanism, which comprises a sliding hole 18 disposed on the inner end face of the mounting sleeve, a sliding rod 19 slidably connected within the sliding hole, a transparent slurry storage tube 21 located inside the jacking pipe body and connected to the sliding hole via a connecting channel 20, a compression spring 22 driving the sliding rod to move outward toward the jacking pipe section, and a connecting channel opening structure 23 driving the sliding rod to move inward toward the jacking pipe section. The sliding rod is a ferromagnetic structure, the sliding hole is a blind hole, and the connecting channel opening structure is an electromagnet used to attract the sliding rod, the electromagnet being fixed to the inner end face of the mounting sleeve. The slurry storage tube is provided with a slurry discharge port, and the slurry discharge port is provided with a cap 24. At the point where sampling is required, sampling is performed first, and then grouting is injected to backwash the permeable holes to unclog them. The sampling process is as follows: With the opening structure in place, the sliding rod moves towards the inside of the jacking pipe section, connecting the communication channel with the jacking pipe installation hole through the sliding hole. The grout in the jacking pipe installation hole enters the grout storage pipe. The appearance and color of the grout are observed through the storage pipe to ensure it meets requirements. Then, the opening grout pipe is closed. At this point, the sliding rod resets under the action of the compression spring, closing the communication channel. The hole cover is removed, allowing the grout in the grout pipe to drain into the sampling pipe, which is then taken to the laboratory for further compositional analysis. This completes one sampling step. The grouting backwashing process after sampling is as follows: With the opening structure in place, the sliding rod moves towards the inside of the jacking pipe section, connecting the communication channel with the gap through the sliding hole. The hole cover is removed, and the grout is injected through the discharge port using a high-pressure pump.

Claims

1. A method for detecting water and soil pressure during pipe jacking, wherein the pipe jacking process includes excavating a pipe jacking installation hole using a tunneling head, then simultaneously pushing the pipe jacking sections one by one from the starting shaft to the receiving shaft into the pipe jacking installation hole using a jacking device, all the pipe jacking sections being joined together to form a jacking pipe, and injecting grout into the pipe jacking installation hole during the pipe jacking process to form a lubrication layer to reduce the resistance during the pipe jacking process, characterized in that... A pore water pressure detection mechanism is integrated on the wall of the jacking pipe section to detect the water pressure inside the jacking installation hole and transmit the detected data to a data processing unit for display and storage. The pore water pressure mechanism includes a mounting sleeve and a pore water pressure sensor. The front end of the mounting sleeve has an external thread section, which is a solid structure. The external thread section is sealed and threaded into the threaded installation hole on the wall of the jacking pipe section. The pore water pressure sensor is installed on the end face of the external thread section. The communication cable of the pore water pressure sensor passes through the external thread section and the mounting sleeve and is connected to the data processing unit. The process of water and soil pressure detection is as follows: during the advancement of the jacking pipe section, the water and soil pressure inside the jacking installation hole is detected by the water and soil pressure sensor. The detected water and soil pressure value of the jacking installation hole is displayed on the screen, and the real-time status of the water and soil pressure value of the jacking installation hole is obtained by observing the water and soil pressure value.

2. The method according to claim 1, characterized in that, The outer end of the threaded mounting hole is provided with a plug, the outer end face of the plug and the outer circumferential surface of the jacking pipe section are located on the same cylindrical surface, the plug is provided with several water-permeable holes, and the pore water pressure sensor is located inside the plug.

3. The method for detecting water and soil pressure during pipe jacking as described in claim 2, characterized in that, The opening area of ​​the permeable hole gradually increases from the outer end to the inner end.

4. The method for detecting water and soil pressure during pipe jacking as described in claim 2, characterized in that, The outer end of the internally threaded hole is provided with an inner flange to form a small diameter section. The plug is installed in the small diameter section. There is a gap between the externally threaded section and the inner flange. The detection end of the pore water pressure sensor passes through the small diameter section.

5. The method for detecting water and soil pressure during pipe jacking as described in claim 4, characterized in that, It also includes a slurry sampling mechanism, which includes a sliding hole set on the inner end face of the mounting sleeve, a sliding rod slidably connected in the sliding hole, a transparent slurry storage pipe located inside the jacking pipe body and connected to the sliding hole through a connecting channel, a compression spring that drives the sliding rod to move toward the outside of the jacking pipe section, and a connecting channel opening structure that drives the sliding rod to move toward the inside of the jacking pipe section. The sliding hole passes through the external threaded section, the slurry storage pipe is provided with a slurry discharge port, and the slurry discharge port is provided with a hole cover.

6. A method for detecting water and soil pressure during pipe jacking as described in claim 4 or 5, characterized in that, The diameter of the mounting sleeve is larger than the diameter of the external thread section to form a pressing step. A sealing ring is fitted on the external thread section. The pressing step presses the sealing ring against the inner circumferential surface of the jacking pipe section, thereby sealing the mounting sleeve with the inner circumferential surface of the jacking pipe section.

7. The method for detecting water and soil pressure during pipe jacking as described in claim 1, characterized in that, It also includes a slurry sampling mechanism, which includes a sliding hole provided on the inner end face of the mounting sleeve, a sliding rod slidably connected in the sliding hole, a transparent slurry storage pipe located inside the jacking pipe body and connected to the sliding hole through a connecting channel, a compression spring that drives the sliding rod to move toward the outside of the jacking pipe section, and a connecting channel opening structure that drives the sliding rod to move toward the inside of the jacking pipe section. The slurry storage pipe is provided with a slurry discharge port, and the slurry discharge port is provided with a hole cover.

8. A method for detecting water and soil pressure during pipe jacking as described in claim 1 or 4, characterized in that, The slide rod is a ferromagnetic structure, the sliding hole is a blind hole, and the opening structure of the connecting channel is an electromagnet for attracting the slide rod. The electromagnet is fixed on the inner end face of the mounting sleeve.

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