Device and method for retaining pipe joint of jacking pipe in jacking process

Abstract

The invention discloses a jacking pipe joint retaining device and method in the jacking process, the device comprises a working well, a jacking pipe joint, pull rings, steel ropes and round pins, the pull rings are arranged on the two sides of a working well tunnel portal and are symmetrically arranged along the axis of the working well, hoisting holes are symmetrically formed in the outer side of the jacking pipe joint along the axis of the working well, and annular steel plates are arranged at the tops of the hoisting holes; a lifting hole is formed in the top pipe joint, an annular steel plate is arranged in the lifting hole, the annular steel plate is tightly attached to the top pipe joint, a round pin is arranged in the lifting hole, a steel cable is arranged between the round pin and the pull ring, and the steel cable is connected with the pull ring and the round pin in a clamping mode. The main jacking oil cylinder is installed on the steel cable, the retreating deformation of the pipe joint in the main jacking oil cylinder retracting and jacking pipe joint assembling process is effectively limited, the electronic dynamometer is installed on the steel cable, when the main jacking oil cylinder retracts and the pipe joint is assembled, the electronic dynamometer can monitor the stress deviation condition of the two sides of the jacking pipe joint, and the stability and safety of the structure in the using process are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe jacking construction, and more specifically, relates to a device and method for preventing a pipe section from retreating during a jacking process. Background Art

[0002] With the sustained and stable growth of my country's economy and the further acceleration of urbanization, the demand for underground pipelines in my country is also increasing year by year. In addition, as people's awareness of environmental protection increases, pipe jacking technology will play an increasingly important role in the construction of underground pipelines in my country. The development of trenchless technology will inevitably develop in the direction of scale, standardization and internationalization. Supported by my country's rapid economic growth, the development of pipe jacking technology will face unprecedented opportunities. In the near future, some fully automatic and high-precision excavation opportunities will become the mainstream of construction machinery. The use of pipe jacking construction will continue to expand with the development of related technologies.

[0003] Pipe jacking is a trenchless underground pipeline construction method. The core of pipe jacking is to use hydraulic jacks and other propulsion devices to push the prefabricated pipe forward section by section in the working pit until it reaches the predetermined position. In this process, the pipe jacking machine (front-end equipment with a cutting head) is used to break the soil or rock in front, and at the same time, the excavated soil and rocks are transported to the outside of the ground through the excavation system.

[0004] During the pipe jacking construction process, the pipe jacking machine has a tendency to retreat toward the starting well as a whole because the resistance of the pipe jacking machine is greater than the friction resistance around the pipe. This retreat trend is more obvious in deep buried or soft formations. The retreat of the pipe may lead to serious consequences such as collapse of the excavation surface, damage to the water stop device at the hole, loss of control of the pipe jacking posture, overall damage to the pipe and large-scale ground settlement. In serious cases, it will affect the safety of road traffic and underground pipelines. These consequences will not only affect the construction progress, but also may cause damage to the surrounding environment and buildings.

[0005] In order to solve the above problems, patent document CN219011301U discloses a backstop device for a jacking segment, which belongs to the technical field of final joints. The jacking segment is pushed out of the sleeve and docked with the last section of the immersed tube; the sleeve is provided with a sleeve concrete sealing door, and the jacking segment is provided with a jacking segment concrete sealing door arranged opposite to the sleeve concrete sealing door, and the two together form a combined cavity; the backstop device includes a first reaction bull leg, a jack, a first support member, and a second reaction bull leg; the first reaction bull leg is installed in the sleeve and located outside the combined cavity; the jack is telescopic in the horizontal direction and installed on the first reaction bull leg; the first support member is arranged in the horizontal direction and connected to the jack, and the end of the first support member away from the jack passes through the sleeve concrete sealing door and is connected to the second reaction bull leg, and the second reaction bull leg is installed in the jacking segment and located in the combined cavity. The backstop device can prevent the jacking segment from moving in the opposite direction, and has a simple and compact structure and is easy to arrange. The device is mainly aimed at the technical field of final joints in submarine tunnel construction, and has a small scope of application.

[0006] In addition, patent document CN206144562U discloses a large-diameter jacking pipe stop device, characterized in that it includes a fixed support assembly (1) and a sliding resistance assembly (2), wherein the fixed support assembly (1) is installed at the bottom of the sliding resistance assembly (2); the large-diameter jacking pipe stop device provided by the utility model adopts double stop measures to effectively eliminate the hidden safety hazards of jacking pipe retreat, and at the same time adopts a ring buckle veneer to tighten the pipe section 360 degrees to prevent the front end of the pipe section from lifting up during the jacking pipe exiting the hole due to excessive active soil pressure and retreat friction; the entire device is easy to operate and has little impact on construction. The opening and closing of the sliding resistance module is achieved only by tightening the nut, which is simple and convenient to operate, saving time and cost, and at the same time, the switching between the rest jacking and jacking processes can be completed by opening and closing the sliding resistance module. However, the installation space required for the stop device is large, which is not conducive to installation in a smaller working well. Summary of the invention

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a device and method for preventing the retreat of a jacking pipe section during jacking. The working well and the jacking pipe section are connected and fixed by a pull ring, a steel cable and a round pin, which can effectively limit the retreat deformation of the pipe section during the assembly process of the main jacking cylinder retracting the pipe section, thereby improving the accuracy and safety of the jacking construction, and ensuring the stability and reliability of the entire jacking structure during the assembly process, providing a solid guarantee for the smooth progress of the jacking project; by making full use of the lifting holes of the jacking pipe section, and pre-buried pull rings in the working well, and using steel cables and round pins to connect and fix the working well and the jacking pipe section, the present invention can effectively prevent the retreat deformation of the pipe section during the assembly process of the main jacking cylinder, thereby improving the accuracy and safety of the jacking construction, and ensuring the stability and reliability of the entire jacking structure during the assembly process, thereby providing a solid guarantee for the smooth progress of the jacking project; by making full use of the lifting holes of the jacking pipe section, and pre-buried pull rings in the working well, and using steel cables and round pins to connect and fix the working well and the jacking pipe section, the present invention can effectively prevent the retreat deformation of the pipe section during the assembly process of the main jacking cylinder retracting the pipe section, thereby improving the accuracy and safety of the jacking construction, and ensuring the stability and reliability of the entire jacking structure during the assembly process, thereby providing a solid guarantee for the smooth progress of the jacking project. The anti-retraction device connected to the pipe has relatively low material cost and is easy to obtain, which helps to control construction costs. It has good versatility and can adapt to different pipe diameters and jacking conditions. The structure is simple to install and has a wide range of applications, which solves the problem of setting up an anti-retraction device in a smaller space. By installing an electronic force gauge on the steel cable, the installed electronic force gauge can monitor the force deviation on both sides of the jacking pipe section when the main jacking cylinder retracts and assembles the pipe section. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment, thereby ensuring the stability and safety of the structure during use.

[0008] In order to achieve the above-mentioned purpose, according to the first aspect of the present invention, there is provided a device for preventing retreat of a jacking pipe section during jacking, comprising a working well, a jacking pipe section, a pull ring, a steel cable and a round pin. Pull rings are provided on both sides of the working well door, symmetrically arranged along the axis of the working well, and lifting holes are symmetrically provided along the axis of the jacking pipe section on the outer side, and an annular steel plate is provided on the top of the lifting hole, and the annular steel plate is close to the jacking pipe section. A round pin is provided in the lifting hole, and a steel cable is provided between the round pin and the pull ring, which is connected to the pull ring and the round pin by a clamping method, so as to effectively limit the backward deformation of the pipe section during the retraction of the main jacking cylinder and the assembly of the jacking pipe section, thereby ensuring the quality and safety of the jacking project.

[0009] Furthermore, the pull ring is provided with 90-degree hooks at both ends and is folded in half from the middle so that the two 90-degree hooks face in opposite directions.

[0010] Furthermore, the pull ring is fixedly connected to the steel bars or formwork of the working pit.

[0011] Furthermore, a rubber pad is provided between the pull ring and the steel cable to prevent the steel cable from being worn.

[0012] Furthermore, an electronic force gauge is provided in the middle of the steel cable for real-time monitoring of the force deviation of the steel cables on both sides of the jacking pipe section.

[0013] Furthermore, the diameter of the round pin end is larger than the diameter of the pin body, and an external thread is provided on the outer side of the pin body.

[0014] Furthermore, a circular hole is provided in the middle of the annular steel plate, and an internal thread is provided on the inner side of the circular hole, and the internal thread on the inner side of the circular hole matches the external thread on the outer side of the pin body.

[0015] According to another aspect of the present invention, a method for preventing a pipe section from retreating during a jacking process is provided, which is implemented by using the above-mentioned device for preventing a pipe section from retreating during a jacking process, and comprises the following steps:

[0016] S100: Preset the working pit and jacking pipe section, and determine the position and depth of the pull ring embedded in the working pit opening, the diameter and length of the steel bar used for the pull ring, the diameter of the steel cable and the size of the round pin according to the design drawings and specification requirements;

[0017] S200: Pre-embed the pull ring at the determined positions on both sides of the working pit, and fix the pull ring to the steel bars or formwork of the working pit, and then pour the concrete of the working pit. After the concrete pouring is completed, check the installation quality of the pull ring;

[0018] S300: Before assembling the next pipe section, install an electronic force gauge on the steel cable, then bend the two ends of the steel cable into rings, and then use rope clamps to clamp the steel cable to the pull ring and round pin respectively, insert the round pin into the lifting holes on both sides of the pipe section, and put the annular steel plate on the round pin to make the annular steel plate close to the pipe section;

[0019] S400: After the anti-retraction device is connected, the main jacking cylinder is retracted and the jacking pipe section is assembled, and the backward deformation of the entire jacking pipe section is limited by the pulling force of the pull ring.

[0020] Furthermore, step S400 also includes carefully inspecting and testing the anti-retraction device before retracting the main jacking cylinder and assembling the jacking pipe section to ensure its reliable performance. During the retracting of the main jacking cylinder and assembling the jacking pipe section, pay close attention to the working status of the anti-retraction device. If any abnormality is found, timely measures should be taken to adjust or repair it.

[0021] Furthermore, S500: When the main jacking cylinder retracts and the jacking pipe section is assembled, the installed electronic force gauge can monitor the force deviation on both sides of the jacking pipe section. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment to make the tension on both sides of the jacking pipe section basically the same.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0023] 1. The anti-retraction device of the present invention connects and fixes the working well and the jacking pipe section through a pull ring, a steel cable and a round pin, which can effectively limit the backward deformation of the pipe section during the assembly process of the main jacking cylinder to retract the pipe section, improve the accuracy and safety of the jacking construction, and ensure the stability and reliability of the entire jacking structure during the assembly process, providing a solid guarantee for the smooth progress of the jacking project.

[0024] 2. The anti-retraction device of the present invention makes full use of the lifting holes of the jacking pipe sections, the pre-buried pull rings in the working well, and the anti-retraction device connected by steel cables and round pins. These materials are relatively low in cost and easy to obtain, which helps to control construction costs. It has good versatility and can adapt to different pipe diameters and jacking conditions. The structure is simple to install and has a wide range of applications, which solves the problem of setting an anti-retraction device in a smaller space.

[0025] 3. The anti-retraction device of the present invention uses a snap-on method to connect the steel cable, the pull ring and the round pin, which is convenient for maintenance or replacement when necessary, ensuring the reliability and durability of the anti-retraction device. When the round pin is inserted into the annular steel plate, the annular steel plate is close to the pipe joint. When the steel cable is subjected to force and transmitted to the round pin, the steel plate and the round pin form a snap-on joint, effectively preventing the round pin from slipping off.

[0026] 4. The anti-retraction device of the present invention installs an electronic force gauge on the steel cable. When the main jacking cylinder retracts and the pipe section is assembled, the installed electronic force gauge can monitor the force deviation on both sides of the jacking pipe section. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment, thereby ensuring the stability and safety of the structure during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an elevation view of a device for preventing a jacking pipe section from retreating during a jacking process according to an embodiment of the present invention;

[0028] Figure 2 It is a top view of a device for preventing a pipe section from retreating during a jacking process according to an embodiment of the present invention;

[0029] Figure 3 It is a front view of the installation of a round pin of a jacking pipe section stop device during jacking according to an embodiment of the present invention;

[0030] Figure 4 A large-scale drawing of a round pin of a jacking pipe section stop device during jacking according to an embodiment of the present invention;

[0031] Figure 5 The present invention is a flow chart of a method for stopping retreat of a pipe section during jacking process according to an embodiment of the present invention.

[0032] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-working well, 2-top pipe section, 3-pull ring, 4-steel cable, 5-round pin, 6-lifting hole, 7-ring-shaped steel plate, 8-electronic force gauge. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] Example 1

[0038] like Figure 1-2 As shown, an embodiment of the present invention provides a device for preventing a pipe section from retreating during jacking, comprising a working shaft 1 and a pipe section (2). Pull rings 3 are provided on both sides of the working shaft 1 opening and are symmetrically arranged along the axis of the working shaft 1. The pull rings 3 are made of HPB300 steel bars. 90-degree hooks are provided at both ends of the pull ring 3. The pull rings 3 are folded in half from the middle so that the two 90-degree hooks face opposite directions, which can increase the stability of the pull ring in concrete, prevent the pull ring from being pulled out, ensure that the connection between the pull ring and the concrete is more secure, and improve the bearing capacity of the overall structure.

[0039] When constructing the working well 1, it is necessary to embed the pull ring 3 on both sides of the working well 1 hole in advance. When installing the pull ring 3, the line should be laid out from the middle of the two axes of the working well 1 to both sides to avoid cumulative errors. When pouring the concrete of the working well 1, in order to prevent the pull ring 3 from shifting, the pull ring 3 is fixedly connected to the steel bar or formwork of the working well 1; during the concrete pouring process of the working well 1, the deviation of the pull ring 3 should be corrected in time. In order to ensure the reliability of the connection between the pull ring 3 and the working well 1, the relevant building specifications and safety standards should be strictly observed. At the same time, after the construction is completed, the installation quality of the embedded pull ring 3 should be checked to ensure that it can meet the safety and use of the structure.

[0040] like Figure 1-3 As shown, the outer side of the jacking pipe section 2 is symmetrically provided with a lifting hole 6 along its axis, and the lifting holes 6 are symmetrically arranged along the axis of the jacking pipe section 2. An annular steel plate 7 is provided on the top of the lifting hole 6, and the annular steel plate 7 is close to the jacking pipe section 2. A circular hole is provided in the middle of the annular steel plate 7, and an internal thread is provided on the inner side of the circular hole. A round pin 5 is provided in the lifting hole 6, and an external thread is provided on the outer side of the pin body of the round pin 5, and the internal thread of the circular hole in the middle of the annular steel plate 7 matches the external thread of the pin body of the round pin 5. The annular steel plate 7 arranged on the outside of the lifting hole 6 is close to the jacking pipe section 2, and the internal thread matches the external thread of the round pin 5, thereby enhancing the connection stability between the round pin 5 and the jacking pipe section 2. The annular steel plate 7 disperses the force transmitted by the round pin 5 to the jacking pipe section 2, preventing the force from directly acting on the lifting hole 6 to damage the lifting hole 6 and affecting the structural safety. The annular steel plate 7 and the round pin 5 form a bayonet, which can effectively prevent the round pin 5 from slipping, thereby improving the safety of the overall structure. The design of the annular steel plate 7 and the round pin 5 has a certain degree of versatility, so it can adapt to jacking pipe sections of different specifications and sizes, so that the pipe section retreat prevention device can be widely used in various jacking projects.

[0041] like Figure 1-3As shown, a steel cable 4 is provided between the pull ring 3 and the round pin 5, and the steel cable 4 is connected to the pull ring 3 and the round pin 5 by a clamping method. The two ends of the steel cable 4 are bent into rings, and then the steel cable 4 is clamped to the pull ring 3 and the round pin 5 respectively by a rope clamp. A rubber pad is provided at the intersection of the steel cable 4 and the pull ring 3 to prevent wear of the steel cable 4, thereby extending the service life of the steel cable 4 and reducing maintenance costs; the clamping method connects the steel cable 4 to the pull ring 3 and the round pin 5, which is easy to operate and does not require complex tools. It can be quickly connected and disconnected, thereby significantly improving construction efficiency. The use of a special rope clamp for clamping and fixing can ensure that the connection between the steel cable 4 and the pull ring 3 and the round pin 5 is both stable and firm, and is suitable for various working environments and conditions. The simple clamping operation reduces the consumption of manpower and material resources in construction and reduces construction costs. Especially at a pipe jacking construction site with limited space or complex operating conditions, this clamping method is relatively simple and effective, which improves the operability and flexibility of construction.

[0042] like Figure 4 As shown, the diameter of the end of the round pin 5 is larger than the diameter of the pin body. When the steel cable 4 is connected to the round pin 5, the larger diameter of the end forms a "stop" effect, which effectively prevents the steel cable 4 from falling off the round pin 5 when subjected to external impact or vibration. The stability of the connection is increased by increasing the size of the end, ensuring that the connection between the steel cable 4 and the round pin 5 is always firm and reliable in various harsh environments.

[0043] Furthermore, an electronic force gauge 8 is provided in the middle of the steel cable 4 for real-time monitoring of the force deviation of the steel cable 4 on both sides of the jacking pipe section 2. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment, thereby ensuring the stability and safety of the structure during use and preventing potential problems caused by excessive or insufficient tension.

[0044] The working principle of the anti-retreat device is as follows: when the main jacking cylinder is retracting and the jacking pipe section 2 is assembled, the working well 1 and the jacking pipe section 2 are connected and fixed by the pull ring 3, steel cable 4 and round pin 5 to limit the backward deformation of the jacking pipe section 2. During the operation of the anti-retreat device, the electronic force gauge 8 can monitor the force deviation on both sides of the pipe section 2. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment, thereby ensuring the stability and safety of the structure during use.

[0045] The anti-retraction device of the present invention connects and fixes the working well 1 and the jacking pipe section 2 through the pull ring 3, the steel cable 4 and the round pin 5, which can effectively limit the retreat deformation of the jacking pipe section 2 during the assembly process of the main jacking cylinder retracting the pipe section, improve the accuracy and safety of the jacking construction, and ensure the stability and reliability of the entire jacking structure during the assembly process, providing a solid guarantee for the smooth progress of the jacking project; by making full use of the lifting hole 6 of the jacking pipe section 2, and the pre-buried pull ring 3 in the working well, the anti-retraction device connected by the steel cable 4 and the round pin 5, these materials are The invention has a relatively low cost and is easy to obtain, which is helpful to control construction costs. It has good versatility and can adapt to different pipe diameters and jacking conditions. The structure is simple to install and has a wide range of applications, which solves the problem of setting a backstop device in a smaller space. By installing an electronic force gauge 8 on the steel cable 4, when the main jacking cylinder retracts and assembles the pipe segment, the installed electronic force gauge 8 can monitor the force deviation on both sides of the jacking pipe segment 2. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment, thereby ensuring the stability and safety of the structure during use.

[0046] Example 2

[0047] Combination Figure 1-4 ,like Figure 5 As shown, the present invention provides a method for preventing a pipe section from retreating during a jacking process. The method is implemented by using the device for preventing a pipe section from retreating during a jacking process, and the specific steps are as follows:

[0048] S100: Preset the working pit 1 and the jacking pipe section 2, and determine the position and depth of the pull ring 3 embedded in the opening of the working pit 1, the diameter and length of the steel bar used for the pull ring 3, the diameter of the steel cable 4 and the size of the round pin 5 according to the design drawings and specification requirements;

[0049] S200: pre-embed the pull ring 3 at the determined positions on both sides of the working well 1, and fix the pull ring 3 to the steel bars or formwork of the working well 1, and then pour concrete for the working well 1. After the concrete pouring is completed, check the installation quality of the pull ring 3;

[0050] S300: Before assembling the next pipe section 2 of the jacking pipe, an electronic force gauge 8 is installed on the steel cable 4, and then the two ends of the steel cable 4 are bent into rings, and then the steel cable 4 is clamped with the pull ring 3 and the round pin 5 respectively by a rope clamp, and the round pin 5 is inserted into the lifting holes 6 on both sides of the jacking pipe section 2, and the annular steel plate 7 is inserted into the round pin 5, so that the annular steel plate 7 is closely attached to the jacking pipe section 2;

[0051] S400: After the anti-retraction device is connected, the main jacking cylinder is retracted and the jacking pipe section 2 is assembled, and the backward deformation of the entire jacking pipe section 2 is limited by the pulling force of the pull ring 3.

[0052] Furthermore, step S400 also includes carefully inspecting and testing the anti-retraction device before retracting the main jacking cylinder and assembling the jacking pipe section 2 to ensure its reliable performance. During the process of retracting the main jacking cylinder and assembling the jacking pipe section 2, pay close attention to the working status of the anti-retraction device. If any abnormality is found, timely measures should be taken to adjust or repair it.

[0053] S500: When the main jacking cylinder retracts and the jacking pipe section 2 is assembled, the installed electronic force gauge 8 can monitor the force deviation on both sides of the jacking pipe section 2. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment to make the tension on both sides of the jacking pipe section 2 basically the same.

[0054] Example 3

[0055] like Figure 5 As shown, the present invention provides a method for preventing a pipe section from retreating during a jacking process. The method is implemented by using the device for preventing a pipe section from retreating during a jacking process, and the specific steps are as follows:

[0056] S100: The preset working shaft 1 adopts a 3400*10300mm rectangular reinforced concrete structure, the shaft wall thickness is 1200mm, the height is within 16m, the concrete is C40P8, the thickness of the concrete protective layer of the outermost steel bar of the working shaft 1 is: 50mm on the soil side of the bottom plate, wall plate, and top plate, and 40mm for the rest not specified. According to the design drawings and specification requirements, the pull ring 3 uses HPB300 grade steel bars with a diameter of 25mm, the pull ring 3 is 600mm long, the burial depth is 500mm, the steel cable 4 uses 24mm steel wire rope, the round pin 5 uses 45# steel, the pin body diameter is 100mm, the tail pier head diameter is 120mm, and the length is 200mm.

[0057] S200: pre-embed the pull ring 3 at the determined positions on both sides of the working well 1, and fix the pull ring 3 to the steel bars or formwork of the working well 1, and then pour concrete for the working well 1. After the concrete pouring is completed, check the installation quality of the pull ring 3;

[0058] S300: Before assembling the next pipe section 2 of the jacking pipe, an electronic force gauge 8 is installed on the steel cable 4, and then the two ends of the steel cable 4 are bent into rings, and then the steel cable 4 is clamped with the pull ring 3 and the round pin 5 respectively by a rope clamp, and the round pin 5 is inserted into the lifting holes 6 on both sides of the jacking pipe section 2, and the annular steel plate 7 is inserted into the round pin 5, so that the annular steel plate 7 is closely attached to the jacking pipe section 2;

[0059] S400: After the anti-retraction device is connected, the main jacking cylinder is retracted and the jacking pipe section 2 is assembled, and the backward deformation of the entire jacking pipe section 2 is limited by the pulling force of the pull ring 3.

[0060] Furthermore, step S400 also includes carefully inspecting and testing the anti-retraction device before retracting the main jacking cylinder and assembling the jacking pipe section 2 to ensure its reliable performance. During the process of retracting the main jacking cylinder and assembling the jacking pipe section 2, pay close attention to the working status of the anti-retraction device. If any abnormality is found, timely measures should be taken to adjust or repair it.

[0061] S500: When the main jacking cylinder retracts and the jacking pipe section 2 is assembled, the installed electronic force gauge 8 can monitor the force deviation on both sides of the jacking pipe section 2. If the deviation is too large, the jacking machine head correction cylinder is used to perform correction adjustment to make the tension on both sides of the jacking pipe section 2 basically the same.

[0062] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preventing the pipe section from retreating during the jacking process, characterized in that: The invention comprises a working well (1), a jacking pipe section (2), a pull ring (3), a steel cable (4) and a round pin (5). Pull rings (3) are arranged on both sides of the working well (1) tunnel door and are symmetrically arranged along the axis of the working well (1). A lifting hole (6) is symmetrically arranged on the outer side of the jacking pipe section (2) along its axis. A ring-shaped steel plate (7) is arranged on the top of the lifting hole (6), and the ring-shaped steel plate (7) is closely attached to the jacking pipe section (2). A round pin (5) is arranged in the lifting hole (6). A steel cable (4) is arranged between the round pin (5) and the pull ring (3). The steel cable (4) is connected to the pull ring (3) and the round pin (5) by a clamping method, so as to effectively limit the backward deformation of the pipe section during the retraction of the main jacking cylinder and the assembly of the jacking pipe section (2), thereby ensuring the quality and safety of the jacking project.

2. The device for preventing the pipe section from retreating during the jacking process according to claim 1 is characterized in that: The pull ring (3) is provided with 90-degree hooks at both ends and is folded in half in the middle so that the two 90-degree hooks face in opposite directions.

3. The device for preventing the pipe section from retreating during the jacking process according to claim 2 is characterized in that: The pull ring (3) is fixedly connected to the steel bars or the template of the working pit (1).

4. The device for preventing the pipe section from retreating during the jacking process according to claim 3 is characterized in that: A rubber pad is provided between the pull ring (3) and the steel cable (4) to prevent the steel cable (4) from being worn.

5. A device for preventing a pipe section from retreating during jacking according to any one of claims 1 to 4, characterized in that: An electronic force gauge (8) is provided in the middle of the steel cable (4) for real-time monitoring of the force deviation of the steel cables (4) on both sides of the jacking pipe section (2).

6. A device for preventing a pipe section from retreating during jacking according to any one of claims 1 to 4, characterized in that: The diameter of the end of the round pin (5) is larger than the diameter of the pin body, and an external thread is provided on the outer side of the pin body.

7. A device for preventing a pipe section from retreating during jacking according to any one of claims 1 to 4, characterized in that: A circular hole is provided in the middle of the annular steel plate (7), and an internal thread is provided inside the circular hole, wherein the internal thread inside the circular hole matches the external thread outside the pin body.

8. A method for stopping the retreat of a jacking pipe section during jacking, characterized in that: The invention is realized by using a device for preventing a pipe section from retreating during jacking according to any one of claims 1 to 7, comprising: S100: Preset the working pit (1) and the jacking pipe section (2), and determine the position and depth of the pull ring (3) embedded in the opening of the working pit (1), the diameter and length of the steel bar used in the pull ring (3), the diameter of the steel cable (4), and the size of the round pin (5) according to the design drawings and specification requirements; S200: pre-embed the pull ring (3) at the determined positions on both sides of the working well (1), and fix the pull ring (3) to the steel bars or formwork of the working well (1), and then pour concrete for the working well (1). After the concrete pouring is completed, check the installation quality of the pull ring (3); S300: Before assembling the next pipe section (2) of the pipe jacking, an electronic force gauge (8) is installed on the steel cable (4), and then the two ends of the steel cable (4) are bent into rings, and then the steel cable (4) is clamped with the pull ring (3) and the round pin (5) respectively by a rope clamp, and the round pin (5) is inserted into the lifting holes (6) on both sides of the pipe section (2), and the annular steel plate (7) is inserted into the round pin (5) so that the annular steel plate (7) is closely attached to the pipe section (2); S400: After the anti-retraction device is connected, the main jacking cylinder is retracted and the jacking pipe section (2) is assembled, and the backward deformation of the entire jacking pipe section (2) is limited by the pulling force of the pull ring (3).

9. A method for preventing a pipe section from retreating during jacking according to claim 8, characterized in that: Step S400 also includes carefully inspecting and testing the anti-retraction device before retracting the main jacking cylinder and assembling the jacking pipe section (2) to ensure its reliable performance. During the process of retracting the main jacking cylinder and assembling the jacking pipe section (2), pay close attention to the working status of the anti-retraction device. If any abnormality is found, timely measures should be taken to adjust or repair it.

10. A method for stopping the retreat of a jacking pipe section during jacking according to claim 8, characterized in that: Also includes: S500: When the main jacking cylinder is retracted and the jacking pipe section (2) is assembled, the installed electronic force gauge (8) can monitor the force deviation on both sides of the jacking pipe section (2). If the deviation is too large, the jacking machine head deviation correction cylinder is used to perform deviation correction adjustment so that the tension on both sides of the jacking pipe section (2) is basically the same.

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