Tunnel secondary lining steel bar protection structure

Abstract

The utility model discloses a tunnel secondary lining steel bar protection structure relates to tunnel construction technical field. Including the inside and the outside two layers steel bar structure of tunnel secondary lining structure use, each layer steel bar structure includes horizontal main reinforcement and longitudinal connecting steel bar, the horizontal main reinforcement with the longitudinal connecting steel bar cross fixed setting constitutes single layer's tunnel secondary lining steel bar structure, and the inside and the outside two layers steel bar structure in adjacent two groups horizontal main reinforcement with the longitudinal connecting steel bar's cross node place sets up hook steel bar, and the hook steel bar both ends are connected with two cross nodes respectively, the hook steel bar both ends all set up node butt joint structure, to make hook steel bar end part through node butt joint structure butt joint cross node.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular to a protective structure for the secondary lining steel bars of a tunnel. Background Technology

[0002] Secondary lining is a cast-in-place concrete or reinforced concrete lining constructed inside the initial support during tunnel construction, forming a composite lining together with the initial support. In contrast to the initial support, secondary lining refers to the inner lining built with reinforced concrete and other materials after the initial support has been implemented in the tunnel. Its purpose is to reinforce the support, optimize the drainage system, improve the appearance, and facilitate the installation of communication, lighting, and monitoring facilities, thus meeting the requirements of modern highway tunnel construction.

[0003] In existing technologies, during the reinforcement arrangement process before concrete pouring for secondary lining, the reinforcement is divided into two layers: an inner layer and an outer layer. Each layer consists of multiple transverse main bars and longitudinal connecting bars distributed intersectingly. After the reinforcement is arranged, each intersection of the transverse main bars and longitudinal connecting bars is tied with wire binding. Subsequently, hook bars (conventional hook bars consist of a steel bar rod and hook-like structures at both ends) are lapped between the two transverse main bars of the two layers of reinforcement to provide structural support and ensure the structural stability of the two layers of reinforcement. The tying of the intersections and the use of hook bars are both for the protection of the secondary lining reinforcement to ensure structural stability. However, some problems still exist: for example, if the tying of the intersections is unstable during concrete pouring, the intersections of the transverse main bars and longitudinal connecting bars can still misalign, leading to structural deformation; the hook bars are also prone to tilting after concrete pouring, resulting in unstable support for the two sets of transverse main bars and structural deformation. All of these situations result in insufficient protection for the tunnel secondary lining reinforcement.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a steel reinforcement protection structure for tunnel secondary lining. Utility Model Content

[0005] The purpose of this utility model is to provide a tunnel secondary lining steel reinforcement protection structure to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a tunnel secondary lining reinforcement protection structure, comprising an inner and outer layer of reinforcement structures used in the tunnel secondary lining structure. Each layer of reinforcement structure includes transverse main bars and longitudinal connecting bars. The transverse main bars and the longitudinal connecting bars are cross-fixed to form a single layer of tunnel secondary lining reinforcement structure. Hook bars are provided at the intersection nodes of two adjacent sets of transverse main bars and longitudinal connecting bars in the inner and outer layers of reinforcement structures. The two ends of the hook bars are respectively connected to the two intersection nodes.

[0008] Both ends of the hook rib are provided with node docking structures, so that the ends of the hook rib can be connected to the cross nodes through the node docking structures.

[0009] Furthermore, the node docking structure includes a cross-shaped connecting rod, and the end of the hook rib is vertically connected to the center position of the cross-shaped connecting rod;

[0010] The four legs of the cross-shaped link are of the same length, and the ends of the four legs are all vertically connected to limit rods.

[0011] Furthermore, the four limiting rods on the four legs of the cross-shaped connecting rod are placed at the four included angles at the intersection of the transverse main reinforcement and the longitudinal connecting reinforcement.

[0012] Furthermore, at the intersection point, the transverse main reinforcement, the longitudinal connecting reinforcement, and the node connection structure are simultaneously tied together using steel wire binding lines.

[0013] Furthermore, a protective pad is connected to the middle of the hook rib, and the protective pad is sleeved and fixed on the hook rib.

[0014] Furthermore, the protective pad has multiple through holes, which are evenly distributed circumferentially on the protective pad.

[0015] Furthermore, during the pouring of concrete for the secondary lining of the tunnel, the protective pad is poured inside the concrete.

[0016] In the above technical solution, the tunnel secondary lining steel reinforcement protection structure provided by this utility model has the following beneficial effects:

[0017] This device combines the binding method of the intersection of transverse main reinforcement and longitudinal connecting reinforcement with the support structure of hook reinforcement to form a node connection structure. Binding is then performed at the intersection of the node connection structure and the intersection. At the same time, protective gaskets are used to enhance the positional stability of the hook reinforcement after concrete pouring. While the hook reinforcement stably supports the two sets of transverse main reinforcement, the positional stability of the hook reinforcement after concrete pouring also improves the relative positional stability of the intersection of transverse main reinforcement and longitudinal connecting reinforcement. Overall, this enhances the effective protection of the tunnel secondary lining reinforcement structure and improves the stability of the tunnel secondary lining structure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of a tunnel secondary lining reinforcement protection structure provided in this embodiment of the present utility model;

[0020] Figure 2 A front view of a node-connecting structure at the intersection of the transverse main bars and longitudinal connecting bars of a tunnel secondary lining steel reinforcement protection structure provided in this embodiment of the utility model;

[0021] Figure 3 A schematic diagram of the node connection structure of a tunnel secondary lining steel reinforcement protection structure provided in this embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the protective gasket of a tunnel secondary lining steel reinforcement protection structure provided in this embodiment of the utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Horizontal main reinforcement; 2. Longitudinal connecting reinforcement; 3. Hook reinforcement; 4. Cross-shaped connecting rod; 5. Limiting rod; 6. Protective gasket; 7. Through hole. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Please see Figure 1-4A tunnel secondary lining reinforcement protection structure includes two layers of reinforcement structures, inner and outer, used in the tunnel secondary lining structure. Each layer of reinforcement structure includes transverse main bars 1 and longitudinal connecting bars 2. The transverse main bars 1 and longitudinal connecting bars 2 are cross-fixed to form a single layer of tunnel secondary lining reinforcement structure. Hook bars 3 are set at the intersection nodes of two adjacent sets of transverse main bars 1 and longitudinal connecting bars 2 in the inner and outer reinforcement structures. The two ends of the hook bars 3 are respectively connected to the two intersection nodes to form a structural fixation and connection at the intersection nodes of the two sets of transverse main bars 1 and longitudinal connecting bars 2 at both ends of the hook bars 3. The fixed hook bars 3 play a role in stably supporting the two sets of transverse main bars 1. Under the connection of this structure, the hook bars 3 are not easy to be displaced, play a stable support role for the two sets of transverse main bars 1, and ensure the stability of the structure.

[0027] Both ends of the hook reinforcement 3 are equipped with node connection structures to allow the ends of the hook reinforcement 3 to connect to the intersection nodes. This connection operation can be carried out simultaneously during the arrangement of the tunnel secondary lining steel reinforcement structure or during the prefabrication of the tunnel secondary lining steel reinforcement. After the secondary lining steel reinforcement structure is arranged in the tunnel, the binding operation is then carried out at the intersection node; so that after the connection, the ends of the hook reinforcement 3 are essentially limited at the node position to ensure the stable support of the transverse main reinforcement 1 at both ends. During the concrete pouring process, due to the enhanced stability between the structures, the possibility of relative misalignment and deformation between the components is reduced, ensuring the stability of the final tunnel secondary lining structure.

[0028] Furthermore, the node connection structure includes a cross-shaped connecting rod 4, with the end of the hook rib 3 vertically connected to the center of the cross-shaped connecting rod 4;

[0029] The four legs of the cross-shaped link 4 are of the same length, and the ends of the four legs of the cross-shaped link 4 are all vertically connected to the limit rod 5.

[0030] After installation, the cross-shaped connecting rods 4 at both ends of the hook bar 3 will press against the longitudinal connecting steel bar 2. The longitudinal connecting steel bar 2 and the transverse main steel bar 1 are intersected and tightly structured, so that the two ends of the hook bar 3 are respectively pressed against the inner and outer transverse main steel bars 1 for support.

[0031] Furthermore, the four limiting rods 5 on the four legs of the cross-shaped connecting rod 4 are placed at the four included angles of the intersection of the transverse main reinforcement 1 and the longitudinal connecting reinforcement 2, respectively. Figure 2As shown, the four limiting rods 5 are intersected at the four included angles at the intersection of the transverse main reinforcement 1 and the longitudinal connecting reinforcement 2. This ensures good stability of the joint structure and the structure at the intersection, while also ensuring the stability of the position of the hook reinforcement 3 relative to the transverse main reinforcement 1 and the longitudinal connecting reinforcement 2. This also ensures the stability of the structure between reinforcements and between components. After the concrete is poured, the positional stability of the hook reinforcement 3 further ensures the stability of the structure between the transverse main reinforcement 1 and the longitudinal connecting reinforcement 2, thereby better ensuring the stability of the tunnel secondary lining structure.

[0032] Furthermore, at the intersection point, the transverse main reinforcement 1, the longitudinal connecting reinforcement 2, and the node connection structure are simultaneously tied together using steel wire binding lines. This allows the steel wire binding lines to not only bind the intersection point of the transverse main reinforcement 1 and the longitudinal connecting reinforcement 2, but also to connect the node connection structure, thereby further enhancing the structural stability of the three components.

[0033] Furthermore, a protective gasket 6 is connected to the middle of the hook reinforcement 3, and the protective gasket 6 is sleeved and fixed to the hook reinforcement 3. After the concrete is poured, the positional stability of the hook reinforcement 3 within the concrete is further enhanced by the positional stability of the protective gasket 6 embedded in the concrete. This ensures the stability of the hook reinforcement 3 supporting the transverse main reinforcement 1 at both ends, as well as the stability of the structure formed by the hook reinforcement 3 in conjunction with the node connection structure, the transverse main reinforcement 1, and the longitudinal connecting reinforcement 2. Overall, this improves the stability of the final tunnel secondary lining structure.

[0034] Furthermore, the protective pad 6 has multiple through holes 7, which are evenly distributed circumferentially on the protective pad 6.

[0035] Furthermore, during the pouring of concrete for the secondary lining of the tunnel, the protective gasket 6 is poured inside the concrete.

[0036] Specifically, the multiple through holes 7 on the protective gasket 6 allow concrete to pass through, preventing hollow concrete around the protective gasket 6 and ensuring the quality of the concrete pouring.

[0037] In summary, this device combines the binding method of the intersection of transverse main reinforcement and longitudinal connecting reinforcement with the support structure of hook reinforcement to form a node connection structure. Binding is then performed at the intersection of the node connection structure and the intersection. At the same time, protective gaskets are used to enhance the positional stability of the hook reinforcement after concrete pouring. While the hook reinforcement stably supports the two sets of transverse main reinforcement, the positional stability of the hook reinforcement after concrete pouring also improves the relative positional stability of the intersection of transverse main reinforcement and longitudinal connecting reinforcement. Overall, this enhances the effective protection of the tunnel secondary lining reinforcement structure and improves the stability of the tunnel secondary lining structure.

[0038] The above description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A tunnel secondary lining reinforcement protection structure, comprising inner and outer layers of reinforcement structures used in the tunnel secondary lining structure, each layer of reinforcement structure comprising transverse main bars (1) and longitudinal connecting bars (2), wherein the transverse main bars (1) and the longitudinal connecting bars (2) are cross-fixed to form a single-layer tunnel secondary lining reinforcement structure, characterized in that, Hook bars (3) are provided at the intersection of two adjacent sets of transverse main bars (1) and longitudinal connecting bars (2) in the inner and outer two-layer steel reinforcement structures, and the two ends of the hook bars (3) are respectively connected to the two intersection nodes; Both ends of the hook rib (3) are provided with node docking structures so that the ends of the hook rib (3) can be docked with the cross node through the node docking structures.

2. The tunnel secondary lining reinforcement protection structure according to claim 1, characterized in that, The node docking structure includes a cross-shaped connecting rod (4), and the end of the hook rib (3) is vertically connected to the center position of the cross-shaped connecting rod (4); The four legs of the cross-shaped link (4) are of the same length, and the ends of the four legs of the cross-shaped link (4) are vertically connected to limit rods (5).

3. The tunnel secondary lining reinforcement protection structure according to claim 2, characterized in that, The four limiting rods (5) on the four legs of the cross-shaped connecting rod (4) are placed at the four included angles at the intersection of the transverse main reinforcement (1) and the longitudinal connecting reinforcement (2).

4. The tunnel secondary lining reinforcement protection structure according to claim 1, characterized in that, The cross-node locations are simultaneously bound together with the transverse main reinforcement (1), the longitudinal connecting reinforcement (2), and the node connection structure using steel wire binding lines.

5. The tunnel secondary lining reinforcement protection structure according to claim 1, characterized in that, A protective pad (6) is connected to the middle of the hook rib (3), and the protective pad (6) is sleeved and fixed on the hook rib (3).

6. The tunnel secondary lining reinforcement protection structure according to claim 5, characterized in that, The protective pad (6) has multiple through holes (7), which are evenly distributed circumferentially on the protective pad (6).

7. The tunnel secondary lining reinforcement protection structure according to claim 5, characterized in that, When pouring concrete for the secondary lining of the tunnel, the protective pad (6) is poured inside the concrete.

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