Anti-crack large-diameter shield segment

Abstract

The utility model discloses a kind of anti-crack large-diameter shield segment, it is related to shield segment technical field, including cement layer, the inner wall of the cement layer is equipped with reinforced cage, the reinforced cage is arc shape, the outer wall of the reinforced cage is welded with reinforced pipe, the two side surfaces of the reinforced cage are symmetrically provided with wire mesh with central axis as center.The utility model is equipped with reinforced cage, reinforced pipe and wire mesh, first, the processed reinforced cage is accurately placed in mould, position and perpendicularity are adjusted, then, wire mesh is laid on the two side surfaces of reinforced cage, to ensure that wire mesh completely covers the side surface area of reinforced cage, and wire mesh and reinforced cage keep close adhesion, then reinforced pipe is used to reinforce reinforced cage and wire mesh, to form a stable overall structure, finally, wire mesh is firmly laid on the outer arc surface of reinforced cage by the extruding force generated by concrete pouring, to reduce the cracks generated by concrete shrinkage.

Description

Technical Field

[0001] This utility model relates to the field of shield tunnel segment technology, specifically to a large-diameter shield tunnel segment with crack prevention. Background Technology

[0002] Shield tunnel segments are the permanent support structure of shield tunnels, playing a crucial role in the construction and operational safety of tunnels. Large-diameter shield tunnel segments are increasingly widely used in large-scale tunnel projects, such as river-crossing tunnels, water pipelines, and large-diameter urban subway lines. Their quality directly determines the quality of the tunnel, undertaking functions such as tunnel formation, soil retention and water prevention, collapse prevention, and resistance to other special damage. However, after the concrete is formed, existing shield tunnel segments are placed in storage areas and exposed to wind and sun. The surface moisture evaporates quickly, resulting in large volume shrinkage, while the internal humidity of the shield tunnel segments changes very little, and the shrinkage is also small. Therefore, the surface shrinkage deformation is constrained by the internal concrete, resulting in tensile stress and causing cracking of the concrete surface. To solve the above problems, a crack-resistant large-diameter shield tunnel segment is needed.

[0003] The existing large-diameter shield tunnel segment cannot prevent surface cracks during operation, so there is an urgent need for a crack-resistant large-diameter shield tunnel segment. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a crack-resistant large-diameter shield tunnel segment to solve the problem that existing large-diameter shield tunnel segments cannot prevent surface cracks during use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a large-diameter shield tunnel segment with crack prevention, comprising a cement layer, a reinforcing cage installed on the inner wall of the cement layer, the reinforcing cage being arc-shaped, reinforcing pipes welded to the outer wall of the reinforcing cage, and wire mesh symmetrically arranged on both sides of the reinforcing cage with its central axis as the center, the wire mesh completely covering the side area of ​​the reinforcing cage and tightly fitting the reinforcing cage, the reinforcing pipes penetrating the interior of the wire mesh and being tied to the wire mesh, the cement layer being integrally cast with the reinforcing cage, the reinforcing pipes and the wire mesh, the wire mesh being fitted to the outer arc surface of the reinforcing cage by the outward force generated by the concrete pouring.

[0006] Preferably, the reinforcing cages are arranged at equal intervals with the central axis of the cement layer as the center.

[0007] Compared with the prior art, the beneficial effects of this utility model are:

[0008] This utility model, through the setting of a reinforcing cage, reinforcing pipes, and wire mesh, firstly, precisely places the processed reinforcing cage in the mold, adjusting its position and verticality. Then, the wire mesh is laid on both sides of the reinforcing cage, ensuring that the wire mesh completely covers the side area of ​​the reinforcing cage and that the wire mesh and the reinforcing cage are tightly fitted together. Next, the reinforcing cage and wire mesh are reinforced with reinforcing pipes to form a stable overall structure. Finally, the outward force generated by the concrete pouring firmly lays the wire mesh on the outer arc surface of the reinforcing cage, reducing cracks caused by concrete shrinkage. Attached Figure Description

[0009] Figure 1 is a structural schematic diagram of the front view of this utility model;

[0010] Figure 2 is a schematic diagram of the internal cross-section of this utility model;

[0011] Figure 3 is a structural schematic diagram showing the internal components of this utility model disassembled.

[0012] In the diagram: 1. Cement layer; 2. Reinforcing cage; 3. Reinforcing pipe; 4. Wire mesh. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0014] The embodiments of this utility model will be described below based on its overall structure.

[0015] Please refer to Figure 1- Figure 3A type of crack-resistant large-diameter shield tunnel segment includes a cement layer 1. A reinforcing cage 2, which is arc-shaped, is installed on the inner wall of the cement layer 1. Reinforcing pipes 3 are welded to the outer wall of the reinforcing cage 2. Wire mesh 4 is symmetrically arranged on both sides of the reinforcing cage 2 around its central axis, completely covering the side areas of the reinforcing cage 2 and tightly fitting it. Reinforcing pipes 3 penetrate the interior of the wire mesh 4 and are tied to it. The cement layer 1, reinforcing cage 2, reinforcing pipes 3, and wire mesh 4 are integrally cast. The wire mesh 4 adheres to the outer arc surface of the reinforcing cage 2 through the outward force generated by the concrete pouring. The reinforcing cage 2 is supported by the cement layer 1. The steel reinforcement cages are arranged at equal intervals around the central axis. Using the prepared steel cages, steel pipes, and wire mesh, the pre-fabricated steel cages are first precisely placed in the mold, and their position and verticality are adjusted. Then, the wire mesh is laid on both sides of the steel cage, ensuring that the wire mesh completely covers the side area of ​​the steel cage and remains tightly fitted to it. Next, steel pipes are used to reinforce the steel cage and wire mesh, forming a stable overall structure. Finally, the outward force generated by the concrete pouring firmly lays the wire mesh on the outer curved surface of the steel cage, reducing cracks caused by concrete shrinkage.

[0016] Working principle: In use, first move the device to the required position, then accurately place the processed rebar cage 2 in the mold, adjust the position and verticality, then lay the wire mesh 4 on both sides of the rebar cage 2, ensuring that the wire mesh 4 completely covers the side area of ​​the rebar cage 2 and that the wire mesh 4 and the rebar cage 2 are tightly fitted together. Then, use the rebar pipe 3 to reinforce the rebar cage 2 and the wire mesh 4 to form a stable overall structure. Finally, pour concrete, and the outward force generated by the concrete pouring will firmly lay the wire mesh 4 on the outer arc surface of the rebar cage 2, reducing cracks caused by concrete shrinkage. Finally, wait for the cement layer 1 to dry and solidify. This completes the use of the device. The contents not described in detail in this manual are existing technologies known to those skilled in the art.

[0017] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crack-resistant large-diameter shield tunnel segment, comprising a cement layer (1), characterized in that: The inner wall of the cement layer (1) is equipped with a reinforcing cage (2), which is arc-shaped. The outer wall of the reinforcing cage (2) is welded with a reinforcing pipe (3). The two sides of the reinforcing cage (2) are symmetrically arranged with the central axis as the center. The wire mesh (4) completely covers the side area of ​​the reinforcing cage (2) and is tightly attached to the reinforcing cage (2). The reinforcing pipe (3) penetrates the interior of the wire mesh (4) and is tied to the wire mesh (4). The cement layer (1), the reinforcing cage (2), the reinforcing pipe (3) and the wire mesh (4) are integrally cast. The wire mesh (4) is attached to the outer arc surface of the reinforcing cage (2) by the outward force generated by the concrete pouring.

2. The anti-crack large-diameter shield tunnel segment according to claim 1, characterized in that: The steel cages (2) are arranged at equal intervals with the central axis of the cement layer (1) as the center.

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