Pipe jacking device for preventing three-round pipe jacking machine from being locked and anti-locking construction method

Abstract

The invention discloses a pipe jacking device capable of preventing a three-round pipe jacking machine from being locked and an anti-locking construction method, and relates to the technical field of pipe jacking construction equipment.The pipe jacking device is provided with a prefabricated pipe joint, a plurality of soil loosening mechanisms and a plurality of soil sucking and conveying mechanisms; the first mounting positions and the second mounting positions which are alternately distributed in the circumferential direction are arranged on the prefabricated pipe joints, so that the number of the soil loosening mechanisms is consistent with that of the first mounting positions, the soil loosening mechanisms and the first mounting positions are arranged in a one-to-one correspondence mode, and the soil loosening mechanisms penetrate through the prefabricated pipe joints and spray high-pressure water to soil in the areas corresponding to the prefabricated pipe joints to prepare slurry; and then the soil suction conveying mechanism is used for sucking and discharging the prepared slurry into the prefabricated pipe joint, so that the friction force between the outer wall of the prefabricated pipe joint and the soil body can be reduced, the jacking resistance can be prevented from being larger than the rated thrust of a propelling system, the pipe jacking machine can be prevented from being locked, and normal construction is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe jacking construction, in particular to a pipe jacking device for preventing pipe jacking machine from locking and a pipe jacking construction method. BACKGROUND

[0002] The three-circle jacking pipe machine is applied to tunnel construction, and its working principle is that the machine head cuts the soil, and at the same time, a pushing system pushes the pipe section forward, and the pipe sections are embedded through the engagement teeth to form a continuous tunnel structure. When the construction is carried out in complex geology, especially in shear-dilatant soil (such as coarse sand layer and sandy pebble stratum), the soil is easily deformed by shear-dilatation after being disturbed by the pipe jacking machine, tightly wraps the outer wall of the pipe section, and hinders the pipe jacking.

[0003] In the construction process of using the three-circle jacking pipe machine for pipe jacking construction, after the shear-dilatant soil wraps the outer wall of the pipe section, the friction between the pipe section and the soil increases sharply, which leads to the jacking resistance exceeding the rated thrust of the pushing system, causing the pipe jacking machine to lock, unable to continue to push, and needing to stop work for treatment, which seriously affects the construction efficiency. The traditional treatment method (such as manual soil excavation and local grouting resistance reduction) needs personnel to operate in the pipe, which has safety risks such as collapse and water inrush, and has long treatment period and high cost. The existing pipe jacking structure has no active pressure relief and soil discharge device, and cannot intervene in time in the early stage of soil shear-dilatation, but can only be passively treated after the locking occurs, lacking preventive ability. Some resistance reduction schemes (such as pipe section outer wall coating resistance reduction agent) have limited effect in shear-dilatant soil, and the soil adhesion can easily damage the resistance reduction coating, which cannot continuously play a role. SUMMARY

[0004] The main purpose of the present application is to provide a pipe jacking device for preventing pipe jacking machine from locking and a pipe jacking construction method, which aims to solve the technical problem that in the construction process of using the three-circle jacking pipe machine for pipe jacking construction, after the shear-dilatant soil wraps the outer wall of the pipe section, the friction between the pipe section and the soil increases sharply, which leads to the jacking resistance exceeding the rated thrust of the pushing system, causing the pipe jacking machine to lock, unable to continue to push, and needing to stop work for treatment, which seriously affects the construction efficiency.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present application provides a pipe jacking device for preventing pipe jacking machine from locking, comprising: a prefabricated pipe section, the radial cross-sectional shape of the prefabricated pipe section is adapted to the cross-sectional shape of the three-circle jacking pipe machine, and a plurality of first installation positions and second installation positions are formed on the prefabricated pipe section and distributed alternately in the circumferential direction; a plurality of soil loosening mechanisms, the number of the soil loosening mechanisms is consistent with and one-to-one corresponds to the number of the first installation positions, each of the soil loosening mechanisms penetrates through the prefabricated pipe section and extends to the outside of the prefabricated pipe section, and the soil loosening mechanism can spray high-pressure water towards the soil of the corresponding area of the outer wall of the prefabricated pipe section and make mud; and, Multiple soil suction and conveying mechanisms are provided, the number of which corresponds to the number of the second installation positions. Each soil suction and conveying mechanism penetrates the precast pipe section radially and can absorb and convey the slurry produced by the loosening mechanism.

[0006] In one embodiment, the soil loosening mechanism includes: A position adjustment component, the position adjustment component being mounted at the first mounting position; and... A water-spraying soil loosening component is installed on the position adjustment component. The water-spraying soil loosening component rotatably passes through the precast pipe section and extends outside the precast pipe section. A first mounting hole is formed at the first mounting position. The first mounting hole radially penetrates the precast pipe section. The water-spraying soil loosening component rotatably passes through the first mounting hole. The water-spraying soil loosening component can spray high-pressure water toward the soil in the area corresponding to the outer wall of the precast pipe section and make mud.

[0007] In one embodiment, the position adjustment component includes: The outer casing is installed at the first installation position. One side of the outer casing is provided corresponding to the first installation hole, and a rotating hole is formed at the position of the outer casing corresponding to the first installation hole. A rotating cylinder is installed in the rotating hole, and the rotating cylinder rotatably passes through the first installation hole and extends to the outside of the prefabricated pipe section. A rotary drive assembly, mounted within the housing and connected to the rotating cylinder, wherein a water-spraying loosening component rotatably passes through the rotating cylinder and is connected to the rotary drive assembly, the water-spraying loosening component passing through the rotating cylinder and extending beyond the precast pipe section; and, A high-pressure water pipe, one end of which passes through the outer casing and extends to be rotatably connected to the water spraying and loosening component. The rotary drive assembly can drive the water spraying and loosening component to rotate so that the water spraying and loosening component can spray high-pressure water at any position and make mud.

[0008] In one embodiment, the rotation drive assembly includes: A rotary drive unit is installed inside the housing, and the output shaft of the rotary drive unit is oriented toward the rotating cylinder; A planetary reducer, mounted at the output end of the rotary drive component, wherein the central axis of the planetary reducer is coaxial with the central axis of the rotating cylinder; and... A rotary bearing is installed on the side of the planetary reducer facing the rotating cylinder. The rotary bearing is connected to the water spraying and loosening component. The rotary drive can drive the planetary reducer to rotate the rotary bearing, so that the water spraying and loosening component can spray high-pressure water at any position and make mud.

[0009] In one embodiment, the rotary drive includes a servo motor and an angle encoder, the angle encoder being mounted on the output shaft of the servo motor, and the servo motor being interference-fitted with the planetary reducer.

[0010] In one embodiment, the water spraying and soil loosening component includes: A first pipe, one end of which is connected to the rotary bearing, the first pipe being radially rotatable through the rotary cylinder and extending outside the prefabricated pipe section; The second pipe is rotatably engaged with the end of the first pipe away from the rotary bearing, and the second pipe is sealed to the first pipe. A water spray nozzle, wherein the water spray nozzle is sealed to the end of the second pipe away from the first pipe, and the end of the water spray nozzle away from the second pipe is provided with a fan-shaped nozzle; and, A telescopic component, the two ends of which are respectively connected to the first pipe and the second pipe, the telescopic component being able to drive the second pipe to rotate relative to the first pipe.

[0011] In one embodiment, an electromagnetic flow valve is also installed on the high-pressure water pipe.

[0012] In one embodiment, a second mounting hole is further formed at the second mounting position, the second mounting hole penetrating the prefabricated pipe section radially; The soil suction and conveying mechanism includes: A fixed support is installed at the second installation position and passes through the second installation hole; A soil suction and conveying assembly, which is mounted on the fixed support and extends through the second mounting hole to the outside of the precast pipe section; and, The conveying pipe is connected to the soil suction and conveying assembly, and the other end of the conveying pipe is connected to the slag discharge component of the three-circle jacking machine. A pneumatic flow valve is installed on the conveying pipe.

[0013] In one embodiment, the soil suction and conveying assembly includes: A negative pressure generator is installed on the fixed support, and the delivery pipe is sealed and connected to the negative pressure generator. A soil suction device is installed on the negative pressure generator, located outside the precast pipe section, and forming a funnel-shaped suction channel that gradually expands radially outward from the outer wall of the precast pipe section; and... A filter screen is installed at the connection between the soil suction component and the negative pressure generator, and a sealing rib is provided between the filter screen and the negative pressure generator.

[0014] Based on the same technical concept, in a second aspect, the present invention also proposes an anti-locking construction method, comprising the following steps: Real-time resistance data of the three-circle pipe jacking machine during the jacking process is collected. Determine whether the real-time resistance data triggers a preset warning condition; wherein, the preset warning condition is that the resistance generated by the pipe jacking machine during the jacking process is greater than the maximum jacking thrust; When the preset warning condition is triggered, the pipe jacking device for preventing the three-circle pipe jacking machine from seizing, as described in the first aspect, is controlled to turn the soil into mud and complete the mud suction and discharge operation. Continue collecting the current resistance data of the three-circle pipe jacking machine; When the current resistance data no longer triggers the preset warning condition, the suction and discharge operation on the soil is stopped and the three-circle pipe jacking machine continues to advance.

[0015] The technical solution of this invention, by setting up prefabricated pipe sections, multiple soil loosening mechanisms, and multiple soil suction and conveying mechanisms, has the following beneficial effects in use: 1. By setting first and second installation positions alternately distributed along the circumference on the precast pipe section, the number of soil loosening mechanisms is consistent with the number of the first installation positions and is set one-to-one. Each soil loosening mechanism passes through the precast pipe section and sprays high-pressure water into the soil in the area corresponding to the precast pipe section to make mud. Then, a soil suction and conveying mechanism is used to suck and discharge the mud into the precast pipe section. This reduces the friction between the outer wall of the precast pipe section and the soil, thereby preventing the jacking resistance from exceeding the rated thrust of the propulsion system, preventing the pipe jacking machine from seizing up, and ensuring normal construction.

[0016] 2. By automatically loosening the soil through multiple loosening mechanisms, the present invention eliminates the need for manual entry into the pipe during use, avoiding personnel safety risks caused by collapses, water inrushes, etc., thus ensuring the processing cycle and reducing processing costs.

[0017] 3. By coordinating multiple soil loosening mechanisms and multiple soil suction and conveying mechanisms, this invention enables the soil to be sucked up and discharged after soil loosening operations, thereby achieving active pressure relief and soil discharge. This reduces the risk of the pipe jacking machine seizing due to soil expansion and will not damage the drag-reducing coating of the pipe jacking machine, ensuring the service life of the pipe jacking machine. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of the pipe jacking device for preventing three-circle pipe jacking machine from seizing, provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the soil loosening mechanism in the example; Figure 3 for Figure 1 A schematic diagram of the structure of the soil suction and conveying mechanism in the example; Figure 4 This is a schematic diagram of the anti-lock braking device in operation, as exemplified by the present invention. Figure 5 This is a flowchart illustrating an anti-lock construction method according to an example of the present invention. Attached image description: 100. Precast pipe section; 110. First mounting hole; 120. Second mounting hole; 200. Soil loosening mechanism; 300. Soil suction and conveying mechanism; 210. Position adjustment component; 220. Water spraying and soil loosening component; 211. Outer shell; 212. Rotating cylinder; 213. Rotary drive assembly; 214. High-pressure water pipe; 215. Rotary drive component; 216. Planetary reducer; 217. Rotary bearing; 218. Servo motor; 21 9. Angle encoder; 221. First pipe; 222. Second pipe; 223. Water spray gun head; 224. Fan-shaped nozzle; 225. Telescopic component; 226. Electromagnetic flow valve; 310. Fixed support; 320. Soil suction and conveying assembly; 330. Conveying pipe; 340. Pneumatic flow valve; 321. Negative pressure generator; 322. Soil suction component; 323. Filter screen; 324. Sealing rib; 400. Three-circle pipe jacking machine.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] In existing technologies, when three-circle interlocking pipe jacking machines are used in tunnel construction, the machine head cuts through the soil and pushes the pipe sections forward to form the tunnel structure. However, in dilatant soil, the soil deforms after being disturbed, tightly wrapping around the outer wall of the pipe section, leading to a sharp increase in friction. The jacking resistance exceeds the thrust of the propulsion system, causing the pipe jacking machine to seize up. Existing technologies lack devices to actively reduce friction on the outer wall of the pipe section, and the resulting downtime significantly impacts construction efficiency.

[0026] This invention proposes a pipe jacking device and a construction method to prevent the three-circle pipe jacking machine from seizing.

[0027] Please see Figures 1 to 5For ease of understanding, this pipe jacking device for preventing three-circle pipe jacking machine from seizing includes a precast pipe section 100, multiple soil loosening mechanisms 200, and multiple soil suction and conveying mechanisms 300. The radial cross-sectional shape of the precast pipe section 100 is adapted to the cross-sectional shape of the three-circle pipe jacking machine 400. Multiple first installation positions and second installation positions are formed on the precast pipe section 100 and are alternately distributed in the circumferential direction. The number of soil loosening mechanisms 200 is consistent with the number of first installation positions and is set one-to-one. Each soil loosening mechanism 200 passes through the precast pipe section 100 and extends to the outside of the precast pipe section 100. The soil loosening mechanism 200 can spray high-pressure water towards the soil in the area corresponding to the outer wall of the precast pipe section 100 and make mud. The number of soil suction and conveying mechanisms 300 is consistent with the number of second installation positions and is set one-to-one. The soil suction and conveying mechanism 300 penetrates the precast pipe section 100 radially and can absorb and convey the mud made by the soil loosening mechanism 200.

[0028] To further clarify, the precast pipe section 100 refers to a concrete component that matches the cross-section of the pipe jacking machine. It has two alternating installation positions arranged circumferentially, for example, it can be formed using a split mold. The first installation position is used to fix the loosening mechanism 200, and the second installation position is used to fix the suction mechanism. The loosening mechanism 200 is a device with high-pressure water jetting capabilities, for example, using a rotating nozzle to directionally spray high-pressure water onto the outer wall area of ​​the pipe section, causing the soil to break up and liquefy. The suction and conveying mechanism 300 is a device with negative pressure suction capabilities, for example, using a centrifugal pump to generate negative pressure, collecting slurry through a funnel-shaped suction port and conveying it to the slag removal system. This alternating layout design ensures that the loosening and suction operation areas do not interfere with each other, forming a continuous drag reduction zone.

[0029] Specifically, the precast pipe section 100 moves synchronously with the pipe jacking machine during the jacking process. When abnormal jacking resistance is detected, the loosening mechanism 200 is activated, and high-pressure water is sprayed outward through the mounting holes on the precast pipe section 100, directionally impacting the contact surface between the outer wall of the pipe section and the soil, causing the dilatational soil to break up and mix with water to form mud. The adjacent suction and conveying mechanism 300 is then activated, using negative pressure suction to discharge the mud through the conveying pipe 330 to the ground treatment system. The loosening and suction operations are carried out alternately to continuously reduce the frictional resistance of the outer wall of the pipe section and prevent the jacking thrust from exceeding the system load.

[0030] In this embodiment, the prefabricated pipe section 100 integrates soil loosening and suction functions to form an embedded drag reduction device, enabling dynamic control of frictional resistance during the jacking process. By setting up the prefabricated pipe section 100, multiple soil loosening mechanisms 200, and multiple suction and conveying mechanisms 300, during use, first and second installation positions are alternately distributed circumferentially on the prefabricated pipe section 100. The number of soil loosening mechanisms 200 corresponds to the number of the first installation positions, and each soil loosening mechanism 200 passes through the prefabricated pipe section 100, spraying high-pressure water into the soil in the area corresponding to the prefabricated pipe section 100 to form slurry. The suction and conveying mechanisms 300 then suck the slurry into the prefabricated pipe section 100, reducing the friction between the outer wall of the prefabricated pipe section 100 and the soil. This allows the invention to prevent the jacking resistance from exceeding the rated thrust of the propulsion system, preventing the pipe jacking machine from seizing up and ensuring normal construction. By employing multiple soil-loosening mechanisms for automatic soil loosening, this invention eliminates the need for manual entry into the pipe during operation, avoiding risks to personnel safety such as collapses and water inrushes. This ensures both processing time and reduced costs. The coordinated use of multiple soil-loosening and soil-suction conveying mechanisms allows the invention to actively depressurize and discharge soil after loosening operations. This reduces the risk of the pipe jacking machine seizing due to soil expansion and prevents damage to the drag-reducing coating, thus ensuring the machine's lifespan.

[0031] In one embodiment, the soil loosening mechanism 200 includes a position adjustment component 210 and a water spraying soil loosening component 220. The position adjustment component 210 is installed at a first installation position, and the water spraying soil loosening component 220 is installed on the position adjustment component 210. The water spraying soil loosening component 220 rotatably passes through the precast pipe section 100 and extends outside the precast pipe section 100. A first installation hole 110 is formed at the first installation position. The first installation hole 110 radially penetrates the precast pipe section 100. The water spraying soil loosening component 220 rotatably passes through the first installation hole 110. The water spraying soil loosening component 220 can spray high-pressure water toward the soil in the area corresponding to the outer wall of the precast pipe section 100 and make mud.

[0032] Specifically, the water-spraying loosening component 220 is installed at the first installation position of the precast pipe section 100 via the position adjustment component 210, with its rotation axis aligned with the radial direction of the precast pipe section 100. When the pipe jacking machine encounters resistance during the jacking process, the water-spraying loosening component 220 extends outward into the soil area, impacting the surrounding soil with high-pressure water flow. The position adjustment component 210 drives the water-spraying loosening component 220 to rotate around its axis, allowing the water spray direction to cover soil areas at different angles. During rotation, the water-spraying loosening component 220 continuously sprays high-pressure water, gradually cutting and converting the soil surrounding the outer wall of the pipe section into mud, thereby reducing the frictional resistance between the pipe section and the soil.

[0033] In this embodiment, the rotatable water-spraying and soil-loosening component 220 can adjust the spray direction according to the actual resistance distribution, avoiding friction concentration caused by local soil accumulation. Meanwhile, the integrated design of the position adjustment component 210 and the precast pipe section 100 allows the soil-loosening mechanism 200 to operate in real time during the jacking process without needing to stop for adjustments.

[0034] In one embodiment, the position adjustment component 210 includes a housing 211, a rotary drive assembly 213, and a high-pressure water pipe 214. The housing 211 is installed at a first installation position. One side of the housing 211 is provided corresponding to the first mounting hole 110, and a rotating hole is formed in the housing 211 at the position corresponding to the first mounting hole 110. A rotating cylinder 212 is installed in the rotating hole. The rotating cylinder 212 rotatably passes through the first mounting hole 110 and extends to the outside of the prefabricated pipe section 100. The rotary drive assembly 213 is installed on the housing 211. Inside, the rotary drive assembly 213 is connected to the rotary cylinder 212. The water spraying and loosening component 220 rotatably passes through the rotary cylinder 212 and is connected to the rotary drive assembly 213. The water spraying and loosening component 220 passes through the rotary cylinder 212 and extends to the outside of the precast pipe section 100. One end of the high-pressure water pipe 214 passes through the outer shell 211 and extends to be rotatably connected to the water spraying and loosening component 220. The rotary drive assembly 213 can drive the water spraying and loosening component 220 to rotate so that the water spraying and loosening component 220 can spray high-pressure water at any position and make mud.

[0035] Specifically, the outer casing 211 is bolted to the first installation position of the precast pipe section 100, and the rotating cylinder 212 is mounted in the rotating hole via bearings, ensuring that the rotating cylinder 212 can rotate freely radially. The servo motor 218 in the rotary drive assembly 213 drives the rotating bearing 217 via a planetary reducer 216, causing the water-spraying loosening component 220 to rotate around the axis of the rotating cylinder 212. The high-pressure water pipe 214 is connected to the water-spraying loosening component 220 via a rotary joint, continuously delivering high-pressure water during the rotation of the water-spraying loosening component 220. Under the control of the rotary drive assembly 213, the water-spraying loosening component 220 can achieve 360-degree rotation, thereby directionally spraying soil in different areas of the outer wall of the precast pipe section 100, thoroughly loosening the soil into slurry.

[0036] In this embodiment, the rotation of the water spraying and loosening component 220 is controlled by the rotation drive component 213, so that its spraying range can cover any angle, thus solving the problem of concentrated frictional resistance caused by local soil residue.

[0037] In one embodiment, the rotary drive assembly 213 includes a rotary drive component 215, a planetary reducer 216, and a rotary bearing 217. The rotary drive component 215 is installed inside the housing 211, and the output shaft of the rotary drive component 215 is positioned facing the rotating cylinder 212. The planetary reducer 216 is installed at the output end of the rotary drive component 215, and the central axis of the planetary reducer 216 is coaxial with the central axis of the rotating cylinder 212. The rotary bearing 217 is installed on the side of the planetary reducer 216 facing the rotating cylinder 212 and is connected to the water spraying and loosening component 220. The rotary drive component 215 can drive the planetary reducer 216 to rotate the rotary bearing 217, so that the water spraying and loosening component 220 can spray high-pressure water at any position and form mud.

[0038] Specifically, the output shaft of the servo motor 218 is reduced in speed and increased in torque by the planetary reducer 216, which then drives the rotary bearing 217 to rotate. The rotary bearing 217 is rigidly connected to the water spraying and loosening component 220, allowing the spraying angle of the water spray nozzle 223 in the soil to be adjusted 360 degrees. When the pipe jacking machine encounters dilatant soil, the servo motor 218 drives the planetary reducer 216 according to a preset program or real-time control signal, causing the water spray nozzle 223 to rotate at a specific speed. The high-pressure water jet from the fan-shaped nozzle 224 can cover the soil in different directions around the outer wall of the pipe section, so that the hard soil surrounding the pipe section is fully cut and broken into mud. The angle encoder 219 monitors the rotation angle in real time and ensures that the spray trajectory matches the shape of the soil-covered area through closed-loop control.

[0039] In this embodiment, the combination of planetary reducer 216 and servo motor 218 enables high-precision angle adjustment within a limited space. The rigid connection structure of rotary bearing 217 avoids angle deviation during power transmission, thus significantly improving the coverage and crushing efficiency of soil loosening operations.

[0040] In one embodiment, the rotary drive 215 includes a servo motor 218 and an angle encoder 219, the angle encoder 219 being mounted on the output shaft of the servo motor 218, and the servo motor 218 being interference-fitted with the planetary reducer 216.

[0041] Specifically, the servo motor 218 drives the planetary reducer 216 via its output shaft, and the angle encoder 219 collects the rotation angle data of the output shaft in real time and transmits it to the control system. When the water spraying and soil loosening component 220 needs to adjust its spray direction, the control system sends a pulse signal to the servo motor 218 according to a preset program, driving the output shaft to rotate at a specific angle. At the same time, the actual rotation data fed back by the angle encoder 219 dynamically corrects the rotation error. The servo motor 218 and the planetary reducer 216 are connected by an interference fit to ensure that there is no relative slippage between the two components during power transmission, thereby maintaining rotational positioning accuracy.

[0042] In this embodiment, high-precision closed-loop control is achieved by combining the servo motor 218 and the angle encoder 219. Combined with interference fit to eliminate transmission backlash, the directional adjustment accuracy and response speed of the water spraying and loosening component 220 are significantly improved.

[0043] In one embodiment, the water spraying and soil loosening component 220 includes a first pipe 221, a second pipe 222, a water spray nozzle 223, and a telescopic component 225. One end of the first pipe 221 is connected to a rotary bearing 217. The first pipe 221 rotatably passes through a rotating cylinder 212 and extends to the outside of the prefabricated pipe section 100. The second pipe 222 is rotatably engaged with the end of the first pipe 221 away from the rotary bearing 217, and the second pipe 222 is sealed to the first pipe 221. The water spray nozzle 223 is sealed to the end of the second pipe 222 away from the first pipe 221, and a fan-shaped nozzle 224 is provided at the end of the water spray nozzle 223 away from the second pipe 222. The two ends of the telescopic component 225 are respectively connected to the first pipe 221 and the second pipe 222, and the telescopic component 225 can drive the second pipe 222 to rotate relative to the first pipe 221.

[0044] Specifically, the first pipe 221 rotates around its own axis under the drive of the rotary bearing 217, causing the water spray head 223 to perform circumferential sweeping spray. Simultaneously, high-pressure water is delivered to the water spray head 223 through the pipe. The rotational cooperation between the second pipe 222 and the first pipe 221 causes the water spray head 223 to undergo an additional angular deflection on top of its rotation. The telescopic component 225 changes the angle between the second pipe 222 and the first pipe 221 through its telescopic movement, thereby adjusting the spray direction. The fan-shaped nozzle 224 diffuses the high-pressure water into a flat water curtain, expanding the soil cutting area. Through the combined motion of rotation and angular deflection, the water spray head 223 can perform multi-angle scouring of the soil surrounding the outer wall of the precast pipe section 100, forming a uniform mud layer.

[0045] In this embodiment, the coordinated control of rotation and deflection allows for a wider coverage area of ​​the high-pressure water jet and improved mud formation efficiency. At the same time, it enables directional flushing of areas with excessive local resistance, preventing soil from encasing the outer wall of the pipe section.

[0046] In one embodiment, an electromagnetic flow valve 226 is also installed on the high-pressure water pipe 214.

[0047] Specifically, during the pipe jacking process, when soil shear dilation increases resistance, the soil suction and conveying mechanism 300 is activated. The negative pressure generator 321 draws the slurry sprayed by the loosening mechanism 200 into the suction channel via the soil suction component 322. The filter screen 323 intercepts stones or hard particles in the slurry, preventing them from entering the conveying pipe 330. The slurry is then conveyed through the conveying pipe 330 to the pipe jacking machine's slag removal system. The flow valve adjusts the slurry flow rate in real time according to the slag removal system's processing capacity to avoid pipe blockage or reduced slag removal efficiency due to excessive instantaneous flow.

[0048] In this embodiment, by setting a flow valve in the conveying pipe 330, the amount of mud suction can be adjusted according to the jacking resistance and the real-time operating conditions of the slag discharge system, which not only ensures the slag discharge efficiency, but also avoids equipment overload caused by sudden changes in flow rate.

[0049] In one embodiment, a second mounting hole 120 is also formed at the second mounting position, and the second mounting hole 120 penetrates the precast pipe section 100 radially; the soil suction and conveying mechanism 300 includes a fixed support 310, a soil suction and conveying component 320 and a conveying pipe 330. The fixed support 310 is installed at the second mounting position and passes through the second mounting hole 120. The soil suction and conveying component 320 is installed on the fixed support 310 and passes through the second mounting hole 120 and extends to the outside of the precast pipe section 100. The conveying pipe 330 is connected to the soil suction and conveying component 320. The other end of the conveying pipe 330 is connected to the slag discharge component of the three-circle jacking machine 400, and a pneumatic flow valve 340 is installed on the conveying pipe 330.

[0050] Specifically, after the loosening mechanism 200 converts the soil into slurry, the suction and conveying assembly 320 stably passes through the second mounting hole 120 via the fixed support 310, with its extension outside the precast pipe section 100 directly contacting the slurry accumulation area. After the negative pressure generator 321 is activated, a negative pressure is created in the suction channel, and the slurry enters the conveying pipe 330 through the filter screen 323. The flow valve adjusts the flow rate according to the slurry concentration to prevent pipe blockage. The slurry is then conveyed through the conveying pipe 330 to the slag removal system of the pipe jacking machine, achieving rapid separation of the soil from the outer wall of the pipe section.

[0051] In this embodiment, by arranging soil loosening and soil suction units alternately in the circumference of the prefabricated pipe section, a continuous operation chain of soil breaking, mud generation and directional discharge is formed, which solves the problem of pipe wall friction caused by mud retention.

[0052] In one embodiment, the soil suction and conveying assembly 320 includes a negative pressure generator 321, a soil suction component 322, and a filter screen 323. The negative pressure generator 321 is installed on a fixed support 310, and the conveying pipe 330 is sealed and connected to the negative pressure generator 321. The soil suction component 322 is installed on the negative pressure generator 321 and is located outside the precast pipe section 100. The soil suction component 322 forms a funnel-shaped suction channel, which gradually expands radially outward from the outer wall of the precast pipe section 100. The filter screen 323 is installed at the connection between the soil suction component 322 and the negative pressure generator 321, and a sealing rib 324 is provided between the filter screen 323 and the negative pressure generator 321.

[0053] Specifically, the negative pressure generator 321 is fixed to the fixed support 310 via a flange connection, and its air inlet is rigidly connected to the delivery pipe 330 via bolts. The flared end face of the soil suction component 322 maintains a distance of 5-10 cm from the outer wall of the precast pipe section 100, with the expansion angle controlled within the range of 30-45 degrees. When the negative pressure generator 321 is activated, a negative pressure zone is formed in the suction channel, and the slurry produced by the loosening mechanism 200 enters the soil suction component 322 along the expansion channel under the action of pressure difference. When the slurry flows through the filter screen 323, pebbles and sand particles with a diameter greater than 3 mm are trapped on the outside of the screen, and the filtered slurry enters the negative pressure generator 321 and is discharged through the delivery pipe 330. The sealing ribs 324 are pressed tightly against the edge of the filter screen 323 by an interference fit to prevent unfiltered slurry from seeping into the negative pressure generator 321 from the connection gap.

[0054] In some specific embodiments, the negative pressure generator 321 can be arranged with two-stage centrifugal fans in series to enhance the suction capacity, the inner wall of the flared mouth of the soil suction component 322 can be provided with a wear-resistant ceramic coating, and the mesh shape of the filter screen 323 can be designed as hexagonal to improve the filtration efficiency.

[0055] In this embodiment, the operating coverage area is expanded by using a gradually expanding suction channel, and solid particles are effectively separated by a multi-stage filtration mechanism, thus solving the technical problem of easy blockage in mud transportation in complex formations.

[0056] Based on the same technical concept, in a second aspect, the present invention also proposes an anti-locking construction method, comprising the following steps: S100. Real-time resistance data of the three-circle pipe jacking machine during the jacking process is collected. S200. Determine whether the real-time resistance data triggers a preset warning condition; wherein, the preset warning condition is that the resistance generated by the pipe jacking machine during the jacking process is greater than the maximum jacking thrust; S300. When the preset warning condition is triggered, the pipe jacking device for preventing the three-circle pipe jacking machine from seizing, as described in the first aspect, is controlled to turn the soil into mud and complete the mud suction and discharge operation. S400, Continue collecting the current resistance data of the three-circle pipe jacking machine; S500. When the current resistance data no longer triggers the preset warning condition, stop the suction and discharge operation of the soil and continue to push the three-circle pipe jacking machine.

[0057] Specifically, during the pipe jacking machine's advancement, pressure sensors continuously monitor the oil pressure changes in the hydraulic propulsion system, transmitting real-time resistance data to the control unit. When the detected resistance value exceeds the preset maximum jacking thrust, the control unit immediately activates the servo motor 218 of the loosening mechanism 200, driving the water spray nozzle 223 to rotate at a set speed, while simultaneously starting the high-pressure water pump to spray water into the soil. The high-pressure water curtain formed by the fan-shaped nozzles 224 cuts through the dense soil surrounding the pipe section, breaking it into a slurry. The synchronously activated negative pressure suction device quickly discharges the slurry through the funnel-shaped suction port, transporting it to the ground sedimentation tank. During this process, the monitoring system continuously collects updated resistance data. When the resistance falls below the safety threshold, the loosening and suction devices are automatically shut off, resuming normal pipe jacking operation.

[0058] More specifically, the soil pressure sensor on the outside of the precast pipe section 100 collects the pressure data between the outer wall of the precast pipe section 100 and the soil in real time, and the pipe jacking cylinder pressure sensor collects the propulsion oil pressure data simultaneously. Both types of data are transmitted to the PLC controller. The PLC controller compares the collected pressure data with preset thresholds. When any pressure data exceeds the preset threshold, it is determined that the shear dilatation soil has begun to accumulate, and the PLC controller automatically starts the integrated "crushing-suction-decompression" system.

[0059] The PLC controller locates the specific area of ​​the dilatant soil based on the detection data from the soil pressure sensor; then it sends control commands to the high-pressure water gun in the corresponding area; the hydraulic drive unit of the telescopic rod is activated, pushing the telescopic rod to extend to the preset length (calculated based on the soil thickness corresponding to the pressure data); the servo motor 218 of the central control rotary platform is activated, driving the main rod to rotate the water gun body to the angle corresponding to the dilatant area; at the same time, the high-pressure water pump is activated, and high-pressure water is sprayed from the fan-shaped nozzle 224 through the high-pressure water pipe and the water gun body, impacting and breaking up the dilatant soil, dispersing it into a mud state; the electromagnetic flow valve 226 adjusts the water flow rate in real time according to the soil density to ensure the breaking effect.

[0060] While the high-pressure water gun starts breaking up the soil, the PLC controller simultaneously sends a start command to the soil unloading and conveying device in the corresponding area; the vortex negative pressure generator 321 introduces compressed air to generate negative pressure; the electric push rod drives the telescopic suction pipe to extend, so that the horn-shaped suction port is close to the mud area; under the action of negative pressure, the dispersed mud is conveyed to the ground mud separation tank through the filter screen 323, the telescopic suction pipe, and the mud conveying pipe 330; the pneumatic flow valve 340 automatically adjusts the valve opening according to the detection data of the mud concentration sensor to control the mud conveying flow rate and avoid pipeline blockage or low conveying efficiency.

[0061] Multiple precast pipe sections 100 work collaboratively along the pipe jacking direction. The first precast pipe section 100 mainly handles the shear resistance of the soil behind the jacking head, and subsequent precast pipe sections 100 sequentially handle the accumulated shear resistance of the soil along the way, forming continuous pressure relief protection. When the soil pressure sensor detects that the pressure on the outer wall of the pipe section drops to a safe threshold (below 0.3MPa) and the pressure of the pipe jacking cylinder returns to the normal advancing range, the PLC controller sends a stop command; the high-pressure water gun telescopic rod retracts and resets, the central control rotating platform drives the water gun body to rotate to the initial position, and the electromagnetic flow valve 226 closes; the negative pressure generator 321 of the soil unloading and conveying device stops working, the telescopic suction pipe retracts and resets, and the pneumatic flow valve 340 closes; the system automatically reduces power and enters standby monitoring state, waiting for the next accumulation of shear resistance soil to repeat the above process.

[0062] In this embodiment, the processing procedure can be started immediately after the early warning is triggered. The processing procedure and the pipe jacking machine advance operation form a closed loop control, avoiding construction interruption.

[0063] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.

Claims

1. A pipe jacking device for preventing a three-circle pipe jacking machine from seizing, characterized in that, include: The prefabricated pipe section has a radial cross-sectional shape that is adapted to the cross-sectional shape of the three-circular jacking machine, and a plurality of first and second installation positions are formed on the prefabricated pipe section in an alternating circumferential distribution. Multiple soil loosening mechanisms are provided, the number of which corresponds to the number of the first installation positions and are arranged one-to-one. Each soil loosening mechanism passes through the precast pipe section and extends beyond the precast pipe section. Each soil loosening mechanism can spray high-pressure water towards the soil in the area corresponding to the outer wall of the precast pipe section to form mud; and... Multiple soil suction and conveying mechanisms are provided, the number of which corresponds to the number of the second installation positions. Each soil suction and conveying mechanism penetrates the precast pipe section radially and can absorb and convey the slurry produced by the loosening mechanism.

2. The anti-seize device for a three-circle pipe jacking machine as described in claim 1, characterized in that, The soil loosening mechanism includes: A position adjustment component, the position adjustment component being mounted at the first mounting position; and... A water-spraying soil loosening component is installed on the position adjustment component. The water-spraying soil loosening component rotatably passes through the precast pipe section and extends outside the precast pipe section. A first mounting hole is formed at the first mounting position. The first mounting hole radially penetrates the precast pipe section. The water-spraying soil loosening component rotatably passes through the first mounting hole. The water-spraying soil loosening component can spray high-pressure water toward the soil in the area corresponding to the outer wall of the precast pipe section and make mud.

3. The pipe jacking device for preventing three-circle pipe jacking machine seizure as described in claim 2, characterized in that, The position adjustment component includes: The outer casing is installed at the first installation position. One side of the outer casing is provided corresponding to the first installation hole, and a rotating hole is formed at the position of the outer casing corresponding to the first installation hole. A rotating cylinder is installed in the rotating hole, and the rotating cylinder rotatably passes through the first installation hole and extends to the outside of the prefabricated pipe section. A rotary drive assembly, mounted within the housing and connected to the rotating cylinder, wherein a water-spraying loosening component rotatably passes through the rotating cylinder and is connected to the rotary drive assembly, the water-spraying loosening component passing through the rotating cylinder and extending beyond the precast pipe section; and, A high-pressure water pipe, one end of which passes through the outer casing and extends to be rotatably connected to the water spraying and loosening component. The rotary drive assembly can drive the water spraying and loosening component to rotate so that the water spraying and loosening component can spray high-pressure water at any position and make mud.

4. The pipe jacking device for preventing three-circle pipe jacking machine seizure as described in claim 3, characterized in that, The rotation drive assembly includes: A rotary drive unit is installed inside the housing, and the output shaft of the rotary drive unit is oriented toward the rotating cylinder; A planetary reducer, mounted at the output end of the rotary drive component, wherein the central axis of the planetary reducer is coaxial with the central axis of the rotating cylinder; and... A rotary bearing is installed on the side of the planetary reducer facing the rotating cylinder. The rotary bearing is connected to the water spraying and loosening component. The rotary drive can drive the planetary reducer to rotate the rotary bearing, so that the water spraying and loosening component can spray high-pressure water at any position and make mud.

5. The anti-seize device for a three-circle pipe jacking machine as described in claim 4, characterized in that, The rotary drive includes a servo motor and an angle encoder. The angle encoder is mounted on the output shaft of the servo motor, and the servo motor is interference-fitted with the planetary reducer.

6. The anti-seize device for a three-circle pipe jacking machine as described in claim 4, characterized in that, The water spraying and soil loosening component includes: A first pipe, one end of which is connected to the rotary bearing, the first pipe being radially rotatable through the rotary cylinder and extending outside the prefabricated pipe section; The second pipe is rotatably engaged with the end of the first pipe away from the rotary bearing, and the second pipe is sealed to the first pipe. A water spray nozzle, wherein the water spray nozzle is sealed to the end of the second pipe away from the first pipe, and the end of the water spray nozzle away from the second pipe is provided with a fan-shaped nozzle; and, A telescopic component, the two ends of which are respectively connected to the first pipe and the second pipe, the telescopic component being able to drive the second pipe to rotate relative to the first pipe.

7. The pipe jacking device for preventing three-circle pipe jacking machine seizure as described in claim 4, characterized in that, An electromagnetic flow valve is also installed on the high-pressure water pipe.

8. The pipe jacking device for preventing three-circle pipe jacking machine seizure as described in any one of claims 1 to 7, characterized in that, A second mounting hole is also formed at the second mounting position, and the second mounting hole penetrates the prefabricated pipe section radially; The soil suction and conveying mechanism includes: A fixed support is installed at the second installation position and passes through the second installation hole; A soil suction and conveying assembly, which is mounted on the fixed support and extends through the second mounting hole to the outside of the precast pipe section; and, The conveying pipe is connected to the soil suction and conveying assembly, and the other end of the conveying pipe is connected to the slag discharge component of the three-circle jacking machine. A pneumatic flow valve is installed on the conveying pipe.

9. The pipe jacking device for preventing three-circle pipe jacking machine seizure as described in claim 8, characterized in that, The soil suction and conveying assembly includes: A negative pressure generator is installed on the fixed support, and the delivery pipe is sealed and connected to the negative pressure generator. A soil suction device is installed on the negative pressure generator, located outside the precast pipe section, and forming a funnel-shaped suction channel that gradually expands radially outward from the outer wall of the precast pipe section; and... A filter screen is installed at the connection between the soil suction component and the negative pressure generator, and a sealing rib is provided between the filter screen and the negative pressure generator.

10. A method for preventing engine locking during construction, characterized in that, Includes the following steps: Real-time resistance data of the three-circle pipe jacking machine during the jacking process is collected. Determine whether the real-time resistance data triggers a preset warning condition; wherein, the preset warning condition is that the resistance generated by the pipe jacking machine during the jacking process is greater than the maximum jacking thrust; When the preset warning condition is triggered, the anti-seize pipe jacking device of the three-circle pipe jacking machine as described in any one of claims 1 to 9 is controlled to turn the soil into mud and complete the mud suction and discharge operation. Continue collecting the current resistance data of the three-circle pipe jacking machine; When the current resistance data no longer triggers the preset warning condition, the suction and discharge operation on the soil is stopped and the three-circle pipe jacking machine continues to advance.

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