A construction method for large-diameter long-distance pipe jacking crossing in complex geology

Abstract

The present invention discloses a method for large-diameter and long-distance pipe jacking construction in complex geology, comprising the following steps: data measurement, calculation of jacking force and bearing capacity, pipe jacking grouting process, pipe jacking correction, long-distance power supply and lighting, ultra-long-distance pipe jacking communication and monitoring, ultra-long-distance ventilation and gas monitoring, measures to prevent machine head from backing off, axis control measures for pipe jacking through soft and hard alternating strata, axis control and machine head floating control during pipe jacking, soil reinforcement, and technical measures for long-distance pipe jacking anti-seepage and plugging. The present invention selects the specifications of the pipe jacking machine and the position and number of relay rooms by calculation, and simultaneously prefabricates the main pipeline during the pipe jacking construction. After the assembly, welding, inspection, anti-corrosion and individual pressure testing are completed and qualified, after the pipe jacking equipment is dismantled, the prefabricated pipe section is inserted into the jacking casing at one time by mechanical assistance, and connected to the original line pipeline with a bend pipe to complete the pipeline crossing installation task, improving efficiency and saving costs.

Description

Technical Field

[0001] The present invention relates to the technical field of large-diameter and long-distance jacking pipe crossing construction, and in particular to a large-diameter and long-distance jacking pipe crossing construction method for complex geological conditions. Background Art

[0002] With the sustained and stable growth of my country's economy and the further development of infrastructure construction, the demand for energy transportation is increasing. Energy transportation requires the construction of long-distance pipelines, which are generally built underground. However, in complex geological conditions such as silty clay interwoven with pebbles and gravel, and prone to collapse, construction may damage the ecological environment and pose problems in pipeline construction safety. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies in the above-mentioned background technology and provide a method for large-diameter and long-distance pipe jacking crossing construction in complex geological conditions with high construction efficiency and reduced costs.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A large-diameter and long-distance pipe jacking construction method for complex geological conditions includes the following steps:

[0006] a. Data measurement, including ground control measurement and pipe jacking machine jacking measurement. Ground control measurement includes re-surveying the given guide points, leveling points and other control points according to the provided engineering positioning and measurement mark data before pipe jacking construction; at the same time, it measures the encrypted control points used in the construction process, and submits the measurement results to the supervision engineer and the owner for review and approval; pipe jacking machine jacking measurement includes a jacking posture measurement and control system installed on the jacking pipe. The jacking posture measurement and control system includes a light target sensor that receives the laser beam and a data processing system. It measures the vertical and horizontal displacement of the measuring plate of the pipe jacking machine cutting cabin with the laser guide point as the reference, the laser incident horizontal angle, and the elevation angle and roll angle of the pipe jacking machine cutting cabin. The measured data is manually processed and calculated through long-distance camera monitoring and microcomputer system, and the position deviation of the pipe jacking machine reflected by the processing results is displayed on the screen of the operation room to guide the operator to make corrections to the pipe jacking machine;

[0007] b. Calculate the jacking force and bearing capacity. Based on the jacking length, casing material, thixotropic mud ratio, and geological conditions, calculate the required jacking force and back wall bearing capacity through calculation formulas to determine the appropriate specifications of the jacking machine and the location and number of relay rooms.

[0008] c. Pipe jacking grouting process: Grouting is done on the outer wall of the pipe to form a complete annular mud lubrication sleeve between the casing and the soil layer, changing the original dry friction state to a liquid friction state to reduce the jacking resistance. Different mud ratios are used according to different geological conditions encountered during the jacking process to ensure that the friction coefficient is at a similar value;

[0009] d. Pipe jacking correction: When the jacking axis deviates, the deviation is gradually reduced and returned to the designed axis position by adjusting the extension and contraction of the correction jack. Three flexible connecting short steel pipes with a length of 1.5 meters are set immediately after the pipe jacking machine. The pipe sections are connected with sockets with sealing rings, and a 2° angle can be generated between the two sections of steel pipes. The automatic guidance measurement system for pipe jacking construction will display the measurement results and reference suggestions for correction measures on the operation screen in a timely manner. The operator can operate the equipment to correct the deviation at any time according to the measurement results and reference suggestions. The correction angle is slowly adjusted each time the correction is made. The correction angle is determined by the pipe diameter, the jacking length and the soil conditions, and is selected between 5'-20'. The correction is carried out during the jacking. The pipeline deviation is measured at least once for every 100mm of jacking, and at least twice when the deviation is large. The pressure of the correction oil pump is strictly controlled to prevent the oil pump pressure from rising too quickly. The changes in the deviation trajectory during the pipe jacking are continuously analyzed to determine the reasonable correction range.

[0010] e. For long-distance power supply and lighting, 380V low-voltage power transmission is used, cable capacity is increased, and booster equipment is installed. Depending on the on-site jacking distance, underground flashlights and mining lamps can be used for lighting;

[0011] f. Ultra-long distance pipe jacking communication and monitoring: digital program-controlled switches are used for communication, and two monitors are used to monitor the tool pipe operation surface and the main top control console respectively;

[0012] g. Ultra-long distance ventilation and gas monitoring. A long-distance push-in pipe ventilation system is used for ventilation. The ventilation pipe is fixed on the side wall of the foundation pit and the side of the inner wall of the steel pipe. An accordion-type hose is used in the relay room. During the entire construction process, the air pipe is continuously extended as the steel pipe extends to ensure pipeline ventilation. The ventilation pipe uses Φ150 hard PVC pipe;

[0013] h. Measures to prevent the machine head from moving backward: multiple anchor steel plates are pre-buried on the wall around the wall pipe of the working well as anchor points. When exiting the hole and lowering the pipe, multiple large-tonnage hand hoists will hold the anchor points and the pipe jacking machine (steel pipe) together, supplemented by welded plates between the steel pipe and the guide rail to prevent the pipe jacking machine and the steel pipe from moving backward;

[0014] i. Axis control measures for jacking pipes through alternating soft and hard strata: carry out geological exploration and geological forecast in advance, select high-quality wear-resistant cutters, reduce the padding effect of the pipe jacking machine on the lower hard layer, dig the machine head toward the hard layer, reduce the eccentric reaction force of the cutterhead, reduce the jacking speed and cutterhead speed, balance the forward and reverse rotation of the cutterhead, reduce the impact of the cutterhead and the roll of the pipe jacking machine, and finely control the circulating mud ratio and jacking parameters to reduce soil loss in the upper soft layer;

[0015] j. Axis control and machine head floating control during pipe jacking: according to the soil quality and cover thickness of the traversing section, combined with the analysis of pipeline axis monitoring information, combined with the relationship between jacking force, jacking speed and excavation volume, the correction amount is controlled;

[0016] k. Soil reinforcement: 1:1 cement mortar grouting reinforcement is carried out within a 1-meter radius around the jacking pipe. Holes are drilled inside the pipe and grouting is carried out outside the pipe using a high-pressure grouting pump. When the soil self-stability is extremely poor, double-tube high-pressure jet grouting is used to reinforce the soil within a 20-meter radius on both sides of the jacking pipe to prevent soil erosion.

[0017] l. Technical measures for anti-seepage and sealing of long-distance jacking pipes. According to the depth of soil covering the jacking pipes and the geological conditions, the wear of the sealing ring in the relay room can be judged. If the sealing ring is severely worn, the sealing treatment of weak links such as the relay room must be strengthened during the jacking process. After the jacking construction is completed, the grouting holes with single-flap one-way valves installed are removed and sealed with sealant. The monitoring holes without one-way valves at the slurry monitoring holes are removed and sealed after grouting in advance, and the grouting holes are sealed with oblique threaded steel plugs.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention utilizes mud-water balanced jacking pipe to drill holes, requiring that the diameter of the drill hole be similar to the outer diameter of the casing, and utilizes grouting filling to consolidate the soil layer structure outside the pipe wall, while playing a lubricating role in the casing jacking, avoiding soil erosion and causing hole collapse; selects a suitable drill bit according to the casing diameter and geological conditions, and selects the specifications of the jacking machine and the position and number of relay rooms through calculation according to the jacking length and geological conditions; prefabrication of the crossing main pipeline is simultaneously carried out during the jacking construction, and after the completion of the pairing, welding, inspection, anti-corrosion and single pressure test, after the jacking equipment is dismantled, the prefabricated pipe section is mechanically assisted to be inserted into the jacking casing at one time, and connected to the original line pipeline with a bend pipe to complete the pipeline crossing installation task; this construction method effectively protects the ecological environment, eliminates the safety risks of pipeline construction under complex geological conditions prone to collapse, and effectively protects the safety of highway operation. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0021] A method for large-diameter, long-distance pipe jacking in complex geology is suitable for metal or non-metallic pipes with a diameter of no more than 2000mm, crossing gravel layers with a length of no more than 800m, and other complex soil structures, as well as important structures such as highways and high-speed railways with limited space on both sides and where large-diameter pipes cannot be traversed by directional drilling. The method includes the following steps:

[0022] a. Data measurement. Measurement is the premise and foundation for the pipe jacking machine to advance along the design axis and ensure the accuracy of the jacking direction of the pipe jacking machine. The measurement includes ground control measurement and pipe jacking machine jacking measurement. The ground control measurement includes re-surveying the given guide points, leveling points and other control points according to the provided engineering positioning and measurement mark data before the pipe jacking construction; at the same time, the encrypted control points used in the construction process are measured, and the measurement results are reported to the supervision engineer and the owner for review and approval; the pipe jacking machine jacking measurement includes the jacking posture measurement and control system installed on the jacking pipe. The jacking posture measurement control system includes a light target sensor and a data processing system that receives the laser beam. It measures the vertical and horizontal displacement of the measuring plate of the pipe jacking machine cutting cabin with the laser guide point as the reference, the laser incident horizontal angle, and the elevation angle and roll angle of the pipe jacking machine cutting cabin. Manual remote control is performed. The remote camera monitoring and microcomputer system processes and calculates the measurement data and displays the position deviation of the pipe jacking machine reflected by the processing results on the screen in the operating room to guide the operator to correct the pipe jacking machine; the measurement system also includes a laser direction finder, a theodolite, an electronic rangefinder, and a level; the elevation angle, roll angle, and horizontal angle of the measuring plate of the pipe jacking machine cutting cabin are measured, and the position (XY) of the laser reference point relative to the pipe jacking machine is measured and input into the system. An interface system is installed every 50 meters or so on the straight section so that the emitted laser beam can be effectively received by the target system. At the same time, the coordinates (XYZ) of the theodolite are manually measured and input into the control system as the reference for calculating the position of the pipe jacking machine.

[0023] b. Calculate the jacking force and bearing capacity. According to the jacking length, casing material, thixotropic mud ratio and geological conditions, the calculation formula is used to calculate the jacking force required for jacking, the bearing capacity of the back wall and other data, and determine the appropriate specifications of the jacking machine and the location and number of relay rooms; ensure the jacking process to prevent the concrete casing from being damaged or the jacking force is insufficient, etc., which may affect the construction quality.

[0024] c. Pipe jacking grouting process: Grouting is done on the outer wall of the pipe to form a complete annular mud lubrication sleeve between the casing and the soil layer, changing the original dry friction state to a liquid friction state to reduce the jacking resistance. Different mud ratios are used according to different geological conditions encountered during the jacking process to ensure that the friction coefficient is at a similar value;

[0025] d. Pipe jacking correction: When the jacking axis deviates, the deviation is gradually reduced and returned to the designed axis position by adjusting the extension and contraction of the correction jack. Three flexible connecting short steel pipes with a length of 1.5 meters are set immediately after the pipe jacking machine. The pipe sections are connected with sockets with sealing rings, and a 2° angle can be generated between the two sections of steel pipes. The automatic guidance measurement system for pipe jacking construction will display the measurement results and reference suggestions for correction measures on the operation screen in a timely manner. The operator can operate the equipment to correct the deviation at any time according to the measurement results and reference suggestions. The correction angle is slowly adjusted each time the correction is made. The correction angle is determined by the pipe diameter, the jacking length and the soil conditions, and is selected between 5'-20'. The correction is carried out during the jacking. The pipeline deviation is measured at least once for every 100mm of jacking, and at least twice when the deviation is large. The pressure of the correction oil pump is strictly controlled to prevent the oil pump pressure from rising too quickly. The changes in the deviation trajectory during the pipe jacking are continuously analyzed to determine the reasonable correction range.

[0026] For long-distance power supply and lighting, 380V low-voltage transmission is used, with increased cable capacity and the installation of booster equipment. Depending on the on-site jacking distance, underground flashlights and mining lamps can be used for lighting. Due to the small diameter of the jacking pipe, high-voltage power supply is unsafe, so 380V low-voltage transmission must be used. To prevent unforeseen circumstances, an automatic booster device is installed. When the line voltage drop is excessive, the booster device activates, stabilizing the construction power voltage and ensuring the normal operation of the jacking equipment.

[0027] f. Ultra-long-distance pipe jacking communication and monitoring uses a digital program-controlled exchange for communication. Contact points can communicate by phone. Due to the humidity in the pipe, moisture-proof and explosion-proof mining telephones or intercoms should be used to ensure call quality. Two monitors are used to monitor the tool pipe operation surface and the main top control console respectively. This allows ground personnel to understand the construction status in a timely manner and solve any problems in a timely manner. In order to solve the problem of signal attenuation during long-distance transmission, the signal is amplified by an amplifier before being sent to the ground to ensure clear images.

[0028] g. Ultra-long distance ventilation and gas monitoring. A long-distance push-in pipe ventilation system is used for ventilation. The ventilation pipe is fixed on the side wall of the foundation pit and the side of the inner wall of the steel pipe. An accordion-type hose is used in the relay room. During the entire construction process, the air pipe is continuously extended as the steel pipe extends to ensure pipeline ventilation. The ventilation pipe is made of Φ150 hard PVC pipe. In addition, a small blower is added when the relay room and other equipment are dismantled after the jacking construction is completed.

[0029] h. Measures to prevent the machine head from moving backward: multiple anchor steel plates are pre-buried on the wall around the wall pipe of the working well as anchor points. When exiting the hole and lowering the pipe, multiple large-tonnage hand hoists will hold the anchor points and the pipe jacking machine (steel pipe) together, supplemented by welded plates between the steel pipe and the guide rail to prevent the pipe jacking machine and the steel pipe from moving backward;

[0030] i. Axis control measures for jacking pipes through alternating soft and hard strata: carry out geological exploration and geological forecast in advance, select high-quality wear-resistant cutters, reduce the padding effect of the pipe jacking machine on the lower hard layer, dig the machine head toward the hard layer, reduce the eccentric reaction force of the cutterhead, reduce the jacking speed and cutterhead speed, balance the forward and reverse rotation of the cutterhead, reduce the impact of the cutterhead and the roll of the pipe jacking machine, and finely control the circulating mud ratio and jacking parameters to reduce soil loss in the upper soft layer;

[0031] j. Axis control and machine head floating control during pipe jacking: According to the soil quality and cover thickness of the crossing section, combined with the analysis of pipeline axis monitoring information, the correction amount is controlled in combination with the relationship between jacking force, jacking speed and excavation volume; during the crossing construction, 4 groups of correction jacks are used to control the machine head posture, and according to the actual jacking situation, pipe bottom ballast measures are taken within a certain range of the tail of the machine head (including the machine head) to control the purpose of machine head floating.

[0032] k. Soil reinforcement: 1:1 cement mortar grouting reinforcement is carried out within a 1-meter radius around the jacking pipe. Holes are drilled inside the pipe and grouting is carried out outside the pipe using a high-pressure grouting pump. When the soil self-stability is extremely poor, double-tube high-pressure jet grouting is used to reinforce the soil within a 20-meter radius on both sides of the jacking pipe to prevent soil erosion.

[0033] l. Technical measures for anti-seepage and sealing of long-distance jacking pipes. According to the depth of soil covering the jacking pipes and the geological conditions, the wear of the sealing ring in the relay room can be judged. If the sealing ring is severely worn, the sealing treatment of weak links such as the relay room must be strengthened during the jacking process. After the jacking construction is completed, the grouting holes with single-flap one-way valves installed are removed and sealed with sealant. The monitoring holes without one-way valves at the slurry monitoring holes are removed and sealed after grouting in advance, and the grouting holes are sealed with oblique threaded steel plugs.

[0034] Furthermore, construction methods also include preparatory work before pipe jacking. The selection of a pipe jacking method should be based on a comprehensive consideration of the actual terrain, engineering and hydrogeology, traffic conditions, above-ground structures, underground pipelines, and the presence of underground obstacles along the construction route, as well as the requirements for controlling surface deformation. Safety, quality, cost-effectiveness, and land conservation must be ensured. The construction sequence of pipe jacking should be considered within the overall drainage system, generally starting downstream. For the initial section, areas with favorable construction conditions, minimal technical risks, and a short jacking distance should be selected. Necessary on-site technical data testing and analysis should be conducted to understand the actual underground soil conditions, adapt to the construction environment, understand the operating principles of the pipe jacking equipment, and rationally organize operators. A summary of the initial excavation section will allow further adjustments to various construction technical parameters and optimize the next step of the pipe jacking process. All pipe jacking equipment must undergo maintenance and inspection before being brought to the construction site. Both individual and complete unit commissioning must be performed before entering the working pit for installation, and routine maintenance procedures must be implemented throughout the jacking process. According to the requirements of ensuring project quality, safety, civilized construction, protecting ground buildings and underground pipelines, and maintaining road traffic, the pipe jacking machine head should be reasonably selected according to different engineering geology, hydrogeology, construction environment and conditions.

[0035] During the jacking of the pipe, the actual pressure value in the soil layer is measured. The pipe jacking machine slowly pushes out the soil layer 0.8 to 1.0m from the hole and then stops jacking. After waiting for 20h, observe the value on the soil pressure gauge of the pipe jacking machine. If the value at this time does not match the calculated value, the actual measured value shall prevail, and the originally calculated propulsion pressure control value and total thrust value shall be adjusted accordingly. The direction of the pipe jacking out of the hole is controlled, and the two sections of concrete pipes behind the machine head are rigidly connected to the machine head to improve the straightness during jacking. Jacking control parameters, excavation control: the excavation rate control value is 95% to 98% during jacking. It is adjusted in time according to the actual situation. The excavation is measured by the extension length of the jacking cylinder, that is, the jacking cylinder extends 75mm and the excavation is about 0.48m. 3 . Axis control: measure the central axis every time the pipeline is pushed forward 250-300nm. If a deviation trend is found, correct it. When the deviation is ≥2Omm, stop pushing immediately, find out the cause and take measures to ensure it before pushing forward again. Ensure the correctness of the axis of the jacking pipe and make corrections frequently. Soil pressure value control: ±2OkPa of the measured soil pressure value. Settlement control: adjust the soil pressure control value, excavation volume and jacking speed in time according to the feedback information from ground settlement monitoring. If the settlement value is found to exceed the standard, stop pushing immediately, find out the cause and take corresponding measures before pushing forward again to ensure the safety of underground pipelines and ground buildings.

[0036] In the construction method of the present invention, the main pipeline passes through the casing and does not directly contact the complex stratum, so the quality is guaranteed. Two sites, namely the excavation point and the burial point, are requisitioned, so the site occupation is small and the environmental impact is small.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A large-diameter, long-distance pipe jacking construction method for complex geological conditions, characterized by: The following steps are included: a. Data measurement, including ground control measurement and pipe jacking machine jacking measurement. Ground control measurement includes re-surveying the given guide points, leveling points and other control points according to the provided engineering positioning and measurement mark data before pipe jacking construction; at the same time, it measures the encrypted control points used in the construction process, and submits the measurement results to the supervision engineer and the owner for review and approval; pipe jacking machine jacking measurement includes a jacking posture measurement and control system installed on the jacking pipe. The jacking posture measurement and control system includes a light target sensor that receives the laser beam and a data processing system. It measures the vertical and horizontal displacement of the measuring plate of the pipe jacking machine cutting cabin with the laser guide point as the reference, the laser incident horizontal angle, and the elevation angle and roll angle of the pipe jacking machine cutting cabin. The measured data is manually processed and calculated through long-distance camera monitoring and microcomputer system, and the position deviation of the pipe jacking machine reflected by the processing results is displayed on the screen of the operation room to guide the operator to make corrections to the pipe jacking machine; b. Calculate the jacking force and bearing capacity. Based on the jacking length, casing material, thixotropic mud ratio and geological conditions, calculate the required jacking force and back wall bearing capacity data through calculation formulas to determine the appropriate specifications of the jacking machine and the location and number of relay rooms; c. Pipe jacking grouting process: Grouting is done on the outer wall of the pipe to form a complete annular mud lubrication sleeve between the casing and the soil layer, changing the original dry friction state to a liquid friction state to reduce the jacking resistance. Different mud ratios are used according to different geological conditions encountered during the jacking process to ensure that the friction coefficient is at a similar value; d. Pipe jacking correction: When the jacking axis deviates, the deviation is gradually reduced and returned to the designed axis position by adjusting the extension and contraction of the correction jack. Three flexible connecting short steel pipes with a length of 1.5 meters are set immediately after the pipe jacking machine. The pipe sections are connected with sockets with sealing rings, and a 2° angle can be generated between the two sections of steel pipes. The automatic guidance measurement system for pipe jacking construction will display the measurement results and reference suggestions for correction measures on the operation screen in a timely manner. The operator can operate the equipment to correct the deviation at any time according to the measurement results and reference suggestions. The correction angle is slowly adjusted each time the correction is made. The correction angle is determined by the pipe diameter, the jacking length and the soil conditions, and is selected between 5'-20'. The correction is carried out during the jacking. The pipeline deviation is measured at least once for every 100mm of jacking, and at least twice when the deviation is large. The pressure of the correction oil pump is strictly controlled to prevent the oil pump pressure from rising too quickly. The changes in the deviation trajectory during the pipe jacking are continuously analyzed to determine the reasonable correction range. e. For long-distance power supply and lighting, 380V low-voltage power transmission is adopted, cable capacity is increased, and booster equipment is installed. Depending on the on-site jacking distance, underground flashlights and mining lamps can be used for lighting; f. Ultra-long distance pipe jacking communication and monitoring: digital program-controlled switches are used for communication, and two monitors are used to monitor the tool pipe operation surface and the main top control console respectively; g. Ultra-long distance ventilation and gas monitoring. A long-distance push-in pipe ventilation system is used for ventilation. The ventilation pipe is fixed on the side wall of the foundation pit and the side of the inner wall of the steel pipe. An accordion-type hose is used in the relay room. During the entire construction process, the air pipe is continuously extended as the steel pipe extends to ensure pipeline ventilation. The ventilation pipe uses Φ150 hard PVC pipe; h. Measures to prevent the machine head from moving backward: multiple anchor steel plates are pre-buried on the wall around the wall pipe of the working well as anchor points. When exiting the hole and lowering the pipe, multiple large-tonnage hand hoists are used to restrain the anchor points and the pipe jacking machine, supplemented by welded plates between the steel pipe and the guide rail to prevent the pipe jacking machine and the steel pipe from moving backward; i. Axis control measures for jacking pipes through alternating soft and hard strata: carry out geological exploration and geological forecast in advance, select high-quality wear-resistant cutters, reduce the padding effect of the pipe jacking machine on the lower hard layer, dig the machine head toward the hard layer, reduce the eccentric reaction force of the cutterhead, reduce the jacking speed and cutterhead speed, balance the forward and reverse rotation of the cutterhead, reduce the impact of the cutterhead and the roll of the pipe jacking machine, and finely control the circulating mud ratio and jacking parameters to reduce soil loss in the upper soft layer; j. Axis control and machine head floating control during pipe jacking: according to the soil quality and cover thickness of the traversing section, combined with the analysis of pipeline axis monitoring information, combined with the relationship between jacking force, jacking speed and excavation volume, the correction amount is controlled; k. Soil reinforcement: 1:1 cement mortar grouting reinforcement is carried out within 1 meter around the jacking pipe. Holes are drilled inside the pipe and grouting is carried out outside the pipe using a high-pressure grouting pump. When the soil self-stability is extremely poor, double-tube high-pressure rotary jetting is used to reinforce the soil within 20 meters on both sides of the jacking pipe to prevent soil erosion. l. Technical measures for anti-seepage and sealing of long-distance jacking pipes. According to the depth of soil covering the jacking pipes and the geological conditions, the wear of the sealing rings in the relay rooms can be judged. If the sealing rings are severely worn, it is necessary to strengthen the sealing of the weak links in the relay rooms during the jacking process. After the jacking construction is completed, the grouting holes where the single-flap one-way valves are installed are removed and sealed with sealant. The monitoring holes without one-way valves at the slurry monitoring holes are removed and sealed after grouting in advance, and the grouting holes are sealed with oblique threaded steel plugs.