Control device for pipe joint seam opening of pipe-jacking tunnel pipe joint

Abstract

The invention discloses a control device for pipe-jacking tunnel pipe joint seam opening. The control device comprises a seam fixing device and a fastening adjusting device, and the seam fixing device comprises at least three annular steel plates and a plurality of positive and negative tooth two-way screw pull rods; the annular steel plates are enclosed in the pipe jacking tunnel to form annular structures matched with the inner walls of the pipe joints, the annular structures and the inner walls of the pipe joints are pulled into a whole through forward and reverse tooth bidirectional screw pull rods, and the annular steel plates are attached to the inner walls of the two sides of a joint of the adjacent pipe joints. The two ends of the positive and negative tooth two-way screw pull rod are respectively connected with the adjacent annular steel plates; the fastening adjusting device is used for adjusting the length of the positive and negative tooth two-way screw pull rod, so that the annular steel plate is tightly attached to the inner wall of the pipe joint, and therefore the relative displacement of the pipe joint at the joint is controlled. The device is simple in structural composition but remarkable in effect, is particularly suitable for complex tunnel line shapes with straight line sections and curved line sections mixed and staggered, has operability of shaping machining, and has very high application and popularization value.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking tunnel engineering technology, specifically to a control device for the tensioning of joints in pipe jacking tunnel sections. Background Technology

[0002] The development of urban underground space is constrained by the dense distribution of protected buildings in the development area and the intricate network of existing underground pipelines. During the excavation of pipe jacking tunnels, the uneven soil conditions often require continuous correction of the jacking alignment. This correction process creates angles at the joints of the pipe sections. Especially in curved jacking, the curved sections of the pipe jacking are not evenly distributed on each pipe section according to the design axis. A bend may form in the middle of the curved section, increasing the resistance of the jacking and increasing the compression deformation of the soil behind the bend. This causes the pipe section axis to deviate from the design axis at the bend, resulting in relative displacement and tension between pipe sections. Under the action of jacking force, this further leads to problems such as pipe section damage, cracks, water leakage, and mud leakage at the joints.

[0003] Therefore, fixing the joints of the pipe sections during the excavation of curved sections and controlling the development of the tension in the joints helps to improve the quality of tunnel ring formation and ensure project safety.

[0004] Existing related technologies, such as patent document (CN117248930A, Control Device for Joint Tension of Shield Tunnel Segments): are primarily designed for shield tunnels, relying on the "central hoisting hole" of the segment to fix the internal steel ring. However, jacking pipe sections typically do not have such hoisting holes, and directly applying this device will lead to installation failure. Furthermore, it uses expansion bolts to tie the circumferential joint, which can easily damage the jacking pipe section (the thickness of the jacking pipe section is usually smaller than that of the shield segment). It also only passively monitors deformation through force-sensitive sensors, lacking the function of actively adjusting the tension and unable to control the development of the tension in real time. Patent document (CN223076426U, Auxiliary Correction Device for Curved Pipe Jacking): its core objective is "correction of the jacking direction," relying on complex hydraulic cylinders and controllers, resulting in high costs and cumbersome installation. Its limiting structure can only limit the maximum gap and cannot actively adjust the joint fit. Moreover, it lacks a dedicated sealing design for the joint tension, still posing a risk of water and mud leakage. Additionally, it cannot be processed synchronously with the pipe sections, resulting in low on-site installation efficiency.

[0005] In summary, there is an urgent need for a pipe joint tension control device that is specifically designed for pipe jacking, has a simple structure, can actively adjust the tension, has strong sealing performance, is adaptable to complex shapes, and can be processed synchronously, in order to solve the above-mentioned technical problems. Summary of the Invention

[0006] The present invention provides a control device for the tension of the joint of the pipe section in a pipe jacking tunnel, which is used to effectively fix the joint of the pipe section in the pipe jacking tunnel and to effectively control the tension angle and axis of the joint of the pipe section during the pipe jacking process; To achieve the above objectives, the technical solution adopted by the present invention is: a control device for the tension of joints in pipe jacking tunnel sections, comprising a joint fixing device and a fastening adjustment device. The joint fixing device includes at least three annular steel plates and several bidirectional threaded tie rods. The annular steel plates are arranged in a ring-shaped structure within the pipe jacking tunnel to fit the inner wall of the pipe section, and are connected as a whole by the bidirectional threaded tie rods. The annular steel plates are attached to the inner walls on both sides of the joint of adjacent pipe sections. The two ends of the bidirectional threaded tie rods are respectively connected to adjacent annular steel plates. The fastening adjustment device is used to adjust the length of the bidirectional threaded tie rods to ensure that the annular steel plates are tightly fitted to the inner wall of the pipe section, thereby controlling the relative displacement of the pipe sections at the joint.

[0007] Furthermore, the outer diameter of the annular steel plate is smaller than the inner diameter of the jacking tunnel, and the diameter of the steel ring is adjusted by a bidirectional threaded rod with positive and negative threads at the joint of the annular steel plate.

[0008] Furthermore, the prefabrication of the annular steel plates allows for the adaptation to tunnels of different diameters by increasing the number of annular steel plates.

[0009] Furthermore, both ends of the annular steel plate are provided with connecting ear plates, and the connecting ear plates are provided with threaded holes.

[0010] Furthermore, the bidirectional screw rods with positive and negative threads are arranged at circumferential intervals along the annular structure.

[0011] Furthermore, the bidirectional screw rod with forward and reverse threads includes a rod body, external threads at both ends of the rod body with opposite directions of rotation, and a hexagonal adjusting block in the middle of the rod body; both ends of the rod body are threadedly connected to the threaded holes of adjacent annular steel plates; the hexagonal adjusting block is used to rotate the rod body with the help of a tool to achieve rapid adjustment of the length of the bidirectional screw rod with forward and reverse threads.

[0012] Furthermore, the fastening adjustment device includes a wrench adapted to a hexagonal adjustment block for rotating the rod.

[0013] Furthermore, the annular steel plate and the bidirectional threaded tie rod are processed and fixed based on the formed pipe section of the jacking tunnel, and are processed and shaped synchronously with the pipe section.

[0014] Furthermore, the pipe joint control device is applicable to straight tunnel sections or curved tunnel sections.

[0015] Furthermore, the pipe joint control device is suitable for complex tunnel alignments where straight and curved sections are interspersed.

[0016] Compared with the prior art, the present invention has the following significant advantages: 1. Dedicated to pipe jacking, highly adaptable: No need to rely on lifting holes, the arc-shaped steel plate directly fits the inner wall of the pipe section, perfectly adapting to pipe jacking structures; 2. Active adjustment and precise control: The joint fit is actively adjusted by a bidirectional screw rod with positive and negative threads, which suppresses the development of tension gaps in real time; 3. Reliable sealing and good leak prevention: The elastic sealing layer on the outside of the arc-shaped steel plate directly adheres to both sides of the joint, effectively filling the gap and solving the problem of "insufficient sealing and leakage of water and mud" in existing technologies; 4. Excellent adaptability to complex lines: The arc-shaped steel plate splicing design and evenly distributed screws ensure uniform stress distribution on the ring structure, which can adapt to complex lines with straight lines and curves interspersed, and avoid local stress concentration; 5. Low cost and easy to promote: The structure is simple and does not require complex parts such as hydraulic cylinders, which reduces manufacturing costs. It is also easy to operate and easy to promote in engineering projects.

[0017] In summary, the control device of this invention has a simple structure yet significant effects, making it highly suitable for complex tunnel alignments with a mix of straight and curved sections. The device is operable with standardized manufacturing processes and can be manufactured simultaneously with tunnel sections, thus possessing strong application and promotion value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pipe joint fixing device of the present invention; The markings in the diagram are as follows: 1-ring steel plate, 2-bidirectional threaded tie rod with positive and negative threads, 3-pipe joint. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the present invention discloses a control device for the tension of joints in pipe jacking tunnel sections, comprising a joint fixing device and a fastening adjustment device. Each joint fixing device includes an annular steel plate 1 and a bidirectional threaded tie rod 2.

[0021] like Figure 1 As shown, the pipe joint 3 between pipe sections is fixed by an annular steel ring 1 tightly attached to the inner wall of the pipe section. The circumferential steel plate 1 is tied into an annular shape by a double-threaded screw rod 2 with positive and negative threads. At the same time, by adjusting the length of the double-threaded screw rod 2, the annular steel plate 1 is tightly attached to the pipe joint, thus controlling the development of the pipe joint angle to a limited extent. The joint control device can be used for both straight and curved tunnel sections, and is particularly suitable for complex tunnel sections with a mix of straight and curved sections.

[0022] Application examples of this invention: The project involves a small pipe jacking tunnel with an outer diameter of DN2400 and an inner diameter of DN2000. The total tunnel length is approximately 138m, consisting of a short straight section + a right turn (R=230m) + another short straight section. After the pipe jacking enters the tunnel, annular steel plates are installed at the joints to effectively control the tension of the pipe sections, preventing further damage, cracking, and misalignment caused by tension, thus bringing significant benefits to the project.

[0023] Installation and usage steps: Factory-synchronized processing: Based on the inner diameter of the pipe section DN2000mm, components such as annular steel plates, positive and negative threaded rods, and support rods are processed in the factory and shipped out simultaneously with the pipe section; On-site installation of joint fixing devices: Step 1: Three annular steel plates are assembled on the inner walls of both sides of the pipe joint to form an annular structure, and then fixed and spliced ​​by bolt assemblies connecting the ear plates; Step 2: Evenly install 10 positive and negative threaded rods along the circumference of the ring structure, and connect both ends to the threaded holes of the arc-shaped steel plate; Step 3: Use a wrench to rotate the hexagonal adjusting block and adjust the screw length so that the annular steel plate fits tightly against the inner wall of the pipe section.

[0024] Engineering effect verification: After the tunnel was completed, the test showed that the tension of all joints was controlled within the allowable range, there was no damage or cracks in the pipe sections, and there was no leakage of water or mud at the joints, which fully met the design requirements.

[0025] In summary, the joint tension control device for pipe jacking tunnel sections of the present invention has a simple structure, reliable performance, and strong adaptability. It can be widely used in various pipe jacking tunnel projects and has extremely high engineering promotion value.

Claims

1. A control device for the tension of joints in pipe jacking tunnel sections, characterized in that, The system includes a joint fixing device and a fastening adjustment device. The joint fixing device comprises at least three annular steel plates and several bidirectional threaded tie rods. The annular steel plates are arranged in a ring-shaped structure within the jacking tunnel to fit the inner wall of the pipe section. They are connected as a whole by the bidirectional threaded tie rods, and the annular steel plates are attached to the inner walls on both sides of the joint between adjacent pipe sections. The two ends of the bidirectional threaded tie rods are respectively connected to the adjacent annular steel plates. The fastening adjustment device is used to adjust the length of the bidirectional threaded tie rods to ensure that the annular steel plates are tightly fitted to the inner wall of the pipe section, thereby controlling the relative displacement of the pipe section at the joint.

2. The control device for tensioning joints of pipe jacking tunnel segments according to claim 1, characterized in that, The outer diameter of the annular steel plate is smaller than the inner diameter of the jacking tunnel. The diameter of the steel ring is adjusted by a bidirectional threaded rod with positive and negative threads at the joint of the annular steel plate.

3. The control device for tensioning joints of pipe jacking tunnel sections according to claim 1, characterized in that, The prefabrication of the annular steel plates is achieved by increasing the number of annular steel plates to accommodate tunnels of different diameters.

4. The control device for tensioning joints of pipe jacking tunnel sections according to claim 1, characterized in that, Both ends of the annular steel plate are provided with connecting lugs, and the connecting lugs are provided with threaded holes.

5. The control device for tensioning joints of pipe jacking tunnel sections according to claim 1, characterized in that, The bidirectional screw rods with positive and negative threads are arranged at intervals along the circumference of the annular structure.

6. The control device for tensioning joints of pipe jacking tunnel segments according to claim 4, characterized in that, The bidirectional screw rod with forward and reverse threads includes a rod body, external threads at both ends of the rod body with opposite directions of rotation, and a hexagonal adjusting block in the middle of the rod body; both ends of the rod body are threadedly connected to the threaded holes of adjacent annular steel plates; the hexagonal adjusting block is used to rotate the rod body with the help of a tool to achieve rapid adjustment of the length of the bidirectional screw rod with forward and reverse threads.

7. The control device for tensioning joints of pipe jacking tunnel sections according to claim 6, characterized in that, The fastening adjustment device includes a wrench that is adapted to a hexagonal adjustment block for rotating the rod.

8. The control device for tensioning joints of pipe jacking tunnel sections according to claim 1, characterized in that, The annular steel plate and the bidirectional threaded tie rod with positive and negative teeth are processed and fixed based on the formed pipe section of the jacking tunnel, and are processed and shaped synchronously with the pipe section.

9. The control device for tensioning joints of pipe jacking tunnel sections according to claim 1, characterized in that, The pipe joint control device is applicable to straight tunnel sections or curved tunnel sections.

10. The control device for tensioning joints of pipe jacking tunnel segments according to claim 1, characterized in that, The pipe joint control device is suitable for complex tunnel alignments where straight and curved sections are interspersed.

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