A large-diameter shield segment floating prevention and reinforcement device

Abstract

The application discloses a kind of reinforcing device for preventing and controlling large-diameter shield segment floating, including at least two grouting reinforcement pipes, and a penetration inclined hole is arranged in soil between the two grouting reinforcement pipes, a hinge joint is arranged at the intersection of the lower end of the penetration inclined hole, and the two hinge shafts of the hinge joint are respectively fixedly connected with inclined rods;A limiting round rod is arranged on the upper end of the grouting reinforcement pipe, the upper end of the inclined rod is fixedly connected with a support rod, the support rod is fixedly connected with a side rod, and the side rod is located at the bottom of the limiting round rod.The application forms reinforcement to the foundation by using the shear fork structure and the grouting reinforcement pipe, and when the segment has the risk of floating, the inclined rod of the shear fork structure is arranged above the segment, so as to transfer the insufficient support force of the soil above the segment to the grouting reinforcement pipe, and the floating control structure is stronger.

Description

Technical Field

[0001] This invention relates to the field of tunnel anti-buoyancy structure technology, and in particular to a device for preventing and reinforcing the floating of large-diameter shield tunnel segments. Background Technology

[0002] The tunnel will rise to a certain extent due to factors such as the excavation of adjacent building foundation pits, utility tunnel foundation pits, underground passages, other railway lines crossing the tunnel, and rising groundwater levels. When the rise of the shield tunnel exceeds the limit, it will cause cracks or misalignments between the tunnel segments, affecting the stability of train operation. In severe cases, it can lead to problems such as bolt breakage, joint damage, partial breakage of tunnel segments, and crack expansion and water seepage, and may even cause damage to the main structure of the tunnel, threatening the operational safety of trains or vehicles inside the shield tunnel.

[0003] Currently, grouting is commonly used to control the uplift of tunnel segments, which forms hard lumps on top of the tunnel segments. The dispersed hard lumps result in limited support capacity. Therefore, a control device for soft soil reinforcement and anti-uplift is needed to improve the reinforcement effect. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a reinforcement device for preventing the floating of large-diameter shield tunnel segments, thereby solving the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for preventing and reinforcing the floating of large-diameter shield tunnel segments includes at least two grouting reinforcement pipes, an inclined hole is provided in the soil between the two grouting reinforcement pipes, a hinge joint is provided at the intersection of the lower ends of the inclined hole, and the two hinge shafts of the hinge joint are respectively fixedly connected to the inclined rod.

[0007] A limiting round rod is provided on the outer side of the upper end of the grouting reinforcement pipe. A support rod is fixedly connected to the upper end of the inclined rod, and a side rod is fixedly connected to the support rod. The side rod is located at the bottom of the limiting round rod.

[0008] Preferably, the hinge joint is provided with a torsion spring, and the hinge shaft of the hinge joint is threadedly connected to the diagonal bar.

[0009] Preferably, a horizontal hole is provided at the upper end of the grouting reinforcement pipe, an end cap is slidably connected to the upper end of the grouting reinforcement pipe, a circular rod is fixedly connected to the inner wall of the end cap, the circular rod slides through the horizontal hole, and the limiting circular rod is fixedly connected to the outside of the end cap.

[0010] Preferably, a displacement sensor is fixedly connected between the end cap and the upper end of the grouting reinforcement pipe.

[0011] Preferably, the inclined rod is a hollow rod, and a slurry discharge hole is provided in the middle of the inclined rod;

[0012] A hardened block is provided at the bottom of the diagonal bar.

[0013] Preferably, the hinge joint has a breakable structure.

[0014] The advantages of this invention are as follows: The large-diameter shield tunnel segment floating prevention and reinforcement device provided by this invention uses a scissor structure in conjunction with a grouting reinforcement pipe to reinforce the foundation. When the segment is at risk of floating, the scissor structure is set above the segment with an inclined bar, thereby transferring the insufficient support force of the soil covering the segment to the grouting reinforcement pipe, thus making the floating control structure stronger.

[0015] In this invention, when the tunnel lining segments float upwards beyond their designed bearing capacity, i.e., the hinge joints bulge upwards and break, the angle of the inclined rods causes the hinge joints to float upwards while the grouting reinforcement pipes remain stationary due to their greater reinforcement depth. As a result, the hardened blocks move in the H direction as shown in the figure. This movement moves directly upwards from the tunnel, preventing further floating. Additionally, the original positions of the hardened blocks form cracks and cavities, allowing for rapid grouting via the inclined rods to alleviate further deterioration of the foundation instability. Compared to re-drilling, this saves rescue time and creates a larger, adjacent area with the hardened blocks, eliminating the need for drilling to locate the blocks and thus resulting in a stronger reinforcement effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the basic structure of the present invention;

[0017] Figure 2 yes Figure 1 Enlarged view of section E in the image;

[0018] Figure 3 This is the front view of the present invention;

[0019] Figure 4 This is a schematic diagram of the connection structure between the end cap and the grouting reinforcement pipe of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Example 1

[0022] like Figures 1 to 4As shown, the present invention provides a prevention and reinforcement device for the floating of large-diameter shield tunnel segments, including at least two grouting reinforcement pipes 1. According to the geological conditions, the structure of the present invention is set at intervals along the tunnel direction. The present invention is explained by one unit structure. An inclined hole 2 is set in the soil between the two grouting reinforcement pipes 1. A hinge joint 3 is set at the intersection of the lower end of the inclined hole 2. The two hinge shafts of the hinge joint 3 are respectively fixedly connected to the inclined rod 4. A torsion spring is set in the hinge joint 3. The hinge shaft of the hinge joint 3 is threadedly connected to the inclined rod 4. The hinge joint 3 is first threadedly fixed to one of the inclined rods 4 and inserted into the lower part of the inclined hole 2. The other inclined rod 4 is inserted into the inclined hole 2 and threadedly connected to the hinge joint 3 located underground through a guide. If necessary, grout is injected into the inclined hole 2 to wrap and reinforce the inclined rod 4.

[0023] A limiting round rod 5 is set on the outer side of the upper end of the grouting reinforcement pipe 1. The upper end of the inclined rod 4 is fixedly connected to the support rod 6. The upper end of the inclined rod 4 is provided with a sliding hole. The support rod 6 slides and extends relative to the inclined rod 4 to facilitate installation. After assembly, it is fixed by welding. The support rod 6 is fixedly connected to the side rod 7, which is located at the bottom of the limiting round rod 5.

[0024] In Example 1, as Figure 1 and Figure 3 As shown, conventional measures to prevent the segment 10 from floating up involve setting grouting hardened blocks 42 on top of the segment. However, in cases of poor soil integrity in the tunnel crossing area (such as insufficient bearing capacity of soft soil), grouting reinforcement pipe 1 is used to reinforce the foundation. When the segment 10 is at risk of floating up, the dispersed hardened blocks 42 provide insufficient support. This invention addresses this by setting a scissor-structured inclined bar 4 above the segment 10. The buoyancy force F1 of the segment 10 is divided into a component force F2 through the inclined bar 4 and acts on the grouting reinforcement pipe 1, thereby transferring the insufficient support force of the overlying soil above the segment 10 to the grouting reinforcement pipe 1, resulting in a stronger buoyancy control structure.

[0025] Example 2

[0026] like Figures 1 to 4 As shown, a horizontal hole 11 is provided at the upper end of the grouting reinforcement pipe 1, and an end cap 12 is slidably connected to the upper end of the grouting reinforcement pipe 1. A circular rod 13 is fixedly connected to the inner wall of the end cap 12. The circular rod 13 slides through the horizontal hole 11, so that the end cap 12 can slide and rise within a certain range without falling off. A limiting circular rod 5 is fixedly connected to the outside of the end cap 12. A displacement sensor 14 is fixedly connected between the end cap 12 and the upper end of the grouting reinforcement pipe 1. Soft soil is filled and covered in the installation pit 111 at the upper end of the grouting reinforcement pipe 1.

[0027] In Example 2, the displacement of the inclined rod 4 in Example 1 is applied to the limiting round rod 5, causing the end cap 12 to move. The displacement sensor 14 identifies the displacement, and then performs risk analysis and subsequent treatment and reinforcement.

[0028] Example 3

[0029] like Figures 1 to 4 As shown, the inclined rod 4 is a hollow rod, and a slurry discharge hole 41 is provided in the middle of the inclined rod 4; a hard block 42 is provided at the bottom of the inclined rod 4. The hard block 42 is formed at the bottom of the inclined rod 4 by drilling a hole 43 on the ground surface. The form of the hard block 42 is a conventional anti-buoyancy means, and the hard block 42 does not cover the slurry discharge hole 41.

[0030] Specifically, hinge joint 3 is a structure that is easily broken.

[0031] In Example 3, conventional methods are used to form hardened blocks 42 on both sides above the segment 10. These hardened blocks 42 prevent the lower segment 10 from floating upwards. When the segment 10 floats upwards beyond its design bearing capacity, i.e., the hinge joint 3 bulges upwards and breaks, the angle of the diagonal bar 4 prevents the hinge joint 3 from floating upwards, while the grouting reinforcement pipe 1 remains stationary due to its greater reinforcement depth. Therefore, the hardened blocks 42... Figure 1 The H-direction movement shown serves two purposes: firstly, it moves directly upwards towards the tunnel, preventing it from floating upwards; secondly, it creates cracks and cavities in the original position of the hardened block 42. At this point, grouting can be quickly injected through the inclined rod 4 to alleviate further deterioration of the foundation instability. Compared to re-drilling, this saves rescue time and creates an enlarged connection with the hardened block 42, eliminating the need to drill to locate the hardened block 42, thus resulting in a stronger reinforcement effect.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preventing and reinforcing the floating of large-diameter shield tunnel segments, comprising at least two grouting reinforcement pipes (1), characterized in that: An inclined hole (2) is set in the soil between the two grouting reinforcement pipes (1). A hinge joint (3) is set at the intersection of the lower end of the inclined hole (2). The two hinge shafts of the hinge joint (3) are fixedly connected to the inclined rod (4). A limiting round rod (5) is provided on the outer side of the upper end of the grouting reinforcement pipe (1), and a support rod (6) is fixedly connected to the upper end of the inclined rod (4). The support rod (6) is fixedly connected to the side rod (7), and the side rod (7) is located at the bottom of the limiting round rod (5). The hinge joint (3) is provided with a torsion spring, and the hinge shaft of the hinge joint (3) is threadedly connected to the diagonal bar (4); The upper end of the grouting reinforcement pipe (1) is provided with a horizontal hole (11), the upper end of the grouting reinforcement pipe (1) is slidably connected to an end cap (12), the inner wall of the end cap (12) is fixedly connected to a circular rod (13), the circular rod (13) slides through the horizontal hole (11), and the limiting circular rod (5) is fixedly connected to the outside of the end cap (12). The inclined rod (4) is a hollow rod, and a slurry discharge hole (41) is provided in the middle of the inclined rod (4); a hard block (42) is provided at the bottom of the inclined rod (4); The hinge joint (3) is a structure that is easily broken. When the segment (10) floats up and exceeds the design bearing capacity, the hinge joint (3) will bulge upward and break.

2. The anti-floating and reinforcement device for large-diameter shield tunnel segments according to claim 1, characterized in that: The displacement sensor (14) is fixedly connected between the end cap (12) and the upper end of the grouting reinforcement pipe (1).

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