Large-section subway tunnel lining steel bar collapse prevention structure

Abstract

The utility model discloses a large-section subway tunnel lining reinforcing steel bar collapse prevention structure which comprises a plurality of connecting supporting rods which are arranged at intervals in the circumferential direction and the longitudinal direction of a primary support in a whole column at intervals. Each connecting support rod extends into primary support concrete of the primary support and then penetrates through the waterproof layer to be fixedly connected with a grid arch frame main rib, the bottom end of each connecting support rod is fixedly connected with an outer side reinforcing steel bar of the secondary lining structure, and an inner side reinforcing steel bar and the outer side reinforcing steel bar of the secondary lining structure are tied through a tie reinforcing steel bar of the secondary lining structure. By adopting the anti-collapse structure for the lining steel bars of the large-section subway tunnel, collapse can be effectively prevented when the secondary lining steel bars are bound, so that the safety is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel processing equipment, in particular to a large-section subway tunnel lining steel bar anti-collapse structure. Background Art

[0002] Tunnels are engineering structures buried in the earth, representing a form of human utilization of underground space. Tunnels can be categorized as transportation tunnels, hydraulic tunnels, municipal tunnels, mining tunnels, and military tunnels. Tunnel construction is not only large-scale but also highly challenging. Before pouring concrete, a mesh of rebar is required at the designed locations of the tunnel lining.

[0003] In existing construction projects, it is necessary to build a frame on the secondary lining steel bar platform, and then pour concrete after the frame is built. During the building process, the secondary lining steel bar platform is prone to collapse, which may cause accidents. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the technical problem to be solved by the utility model is to provide a large-section subway tunnel lining steel bar anti-collapse structure, which can effectively prevent the second lining steel bar platform from collapsing, thereby improving.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a large-section subway tunnel lining steel bar anti-collapse structure, comprising a plurality of connecting support rods, wherein the plurality of connecting support rods are arranged in rows spaced apart in the circumferential and longitudinal directions of the primary support, and each of the connecting support rods is extended into the primary support concrete of the primary support and then passes through the waterproof layer and is fixedly connected to the main reinforcement of the grid arch frame, the bottom end of the connecting support rod is fixedly connected to the outer steel bar of the secondary lining structure, and the inner steel bar and the outer steel bar of the secondary lining structure are tied together by the tie steel bar of the secondary lining structure.

[0006] Furthermore, the connecting support rod is in an inverted L shape, the top end of the connecting support rod is welded to the main reinforcement of the grid arch, and the bottom end of the connecting support rod is welded and fixed to the outer reinforcement of the secondary lining structure.

[0007] Furthermore, the connecting support rod is formed by bending section steel.

[0008] Furthermore, a sealing rubber pad is fixedly mounted on the bottom end of the connecting support rod, and the sealing rubber pad is in sealing contact with the lower surface of the waterproof layer.

[0009] Furthermore, a water-swelling water-stopping adhesive is provided between the bottom end of the connecting support rod and the outer steel bar contact surface of the secondary lining structure.

[0010] Furthermore, it also includes a waterproof reinforcement layer, which is laid between the primary waterproof layer and the primary reinforcement layer. The upper and lower surfaces of the waterproof reinforcement layer can be sealed and connected to the contact surface between the primary waterproof layer and the primary reinforcement layer respectively.

[0011] Beneficial effects of the utility model:

[0012] The above-mentioned large-section subway tunnel lining steel anti-collapse structure includes a plurality of connecting support rods, which are arranged in rows at intervals along the circumferential and longitudinal directions of the primary support. After each connecting support rod is extended into the primary support concrete of the primary support, it passes through the waterproof layer and is fixedly connected to the main reinforcement of the grid arch frame. The bottom end of the connecting support rod is fixedly connected to the outer steel bars of the secondary lining structure, and the inner steel bars and the outer steel bars of the secondary lining structure are tied together by the tie bars of the secondary lining structure.

[0013] The above-mentioned large-section subway tunnel lining steel bar anti-collapse structure is adopted, and the connection and fixation of multiple connecting support rods can effectively prevent the collapse of the secondary lining steel bars during binding, thereby effectively improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0015] Figure 1 A schematic diagram of a large-section subway tunnel lining steel bar anti-collapse structure provided by one embodiment of the present utility model;

[0016] Figure 2 for Figure 1 A schematic diagram of a large-section subway tunnel lining steel bar anti-collapse structure installed in the tunnel is shown;

[0017] Reference numerals:

[0018] 1. Main reinforcement of grille arch frame; 2. Reinforcement layer; 3. Waterproof layer; 4. Outer reinforcement; 5. Inner reinforcement; 6. Tie reinforcement; 7. Connecting support rod; 8. Sealing pad; 9. Water-expanding waterstop; 10. Waterproof reinforcement layer. DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0020] See Figures 1 to 2The present invention provides a large-section subway tunnel lining reinforcement collapse prevention structure, comprising a plurality of connecting support rods 7 arranged in rows spaced apart in the circumferential and longitudinal directions of the primary support. Each connecting support rod 7 extends into the primary concrete support, passes through the waterproof layer 3, and is fixedly connected to the main reinforcement 1 of the grid arch. The bottom end of the connecting support rod 7 is fixedly connected to the outer reinforcement 4 of the secondary lining structure. The inner reinforcement 5 of the secondary lining structure is tied to the outer reinforcement 4 by the tie bars 6 of the secondary lining structure.

[0021] In this embodiment, the connecting support rod 7 can be in an inverted L shape, with the top end of the connecting support rod 7 welded to the main reinforcement 1 of the grid arch frame, and the bottom end of the connecting support rod 7 is welded and fixed to the outer reinforcement 4 of the secondary lining structure. Since the top of the connecting support rod 7 is a flat shape, the welding area can be increased, thereby improving the connection stability. In a specific implementation, the connecting support rod 7 can be formed by bending a steel section. In other embodiments, the connecting support rod 7 can also be T-shaped or other shapes, and the connection method with the main reinforcement 1 of the grid arch frame and the outer reinforcement 4 of the secondary lining structure can also be other forms, such as bundling.

[0022] As a preferred embodiment, during implementation, a fixed sealing pad 8 can be mounted on the bottom end of the connecting support rod 7, with the sealing pad 8 sealingly abutting the lower surface of the waterproof layer 3. This sealing pad 8 provides a waterproof seal. Furthermore, a water-swelling waterstop 9 can be installed between the bottom end of the connecting support rod 7 and the contact surface with the outer steel bars 4 of the secondary lining structure. This water-swelling waterstop 9 expands when exposed to water, further enhancing the sealing and waterproofing effect.

[0023] As another more preferred embodiment, the present structure further includes a waterproof reinforcement layer 10, which is laid between the primary waterproof layer 3 and the primary reinforcement layer 2. The upper and lower surfaces of the waterproof reinforcement layer 10 are respectively sealed to the contact surfaces of the primary waterproof layer 3 and the primary reinforcement layer 4. The waterproof reinforcement layer 2 improves the waterproofing effect between the primary reinforcement layer 2 and the waterproof layer 3.

[0024] The installation and fixing method of the above-mentioned large-section subway tunnel lining steel anti-collapse structure is as follows:

[0025] During installation, anti-collapse device points can be marked every 3m in the circumferential direction and every 1.5m in the longitudinal direction above the primary support arch line, with a total of 48 points per 9m long mold; the primary support sprayed concrete is partially chiseled out at this location, and the connecting support rod 7 is made of φ25 bent, the transverse section of the connecting support rod 7 is 200mm, and is welded to the main reinforcement 1 of the grid arch on one side, and the length of the connecting support rod 7 penetrating into the second lining structure is 100mm; the outer reinforcement 4 of the second lining structure is welded to the connecting support rod 7 when tying; when tying the inner reinforcement 5 of the second lining structure, the second lining tie reinforcement 6 originally designed for the second lining structure is used to tie the outer reinforcement 4 of the second lining and the inner reinforcement 5 of the second lining. Before the large-scale tying and installation of the second lining inner reinforcement 5, the two longitudinal reinforcements and one circumferential reinforcement at each connecting support rod 7 position are tied first, and fixed with the second lining tie reinforcement 6 and the outer reinforcement 4. After completion, large-scale construction of the second lining inner reinforcement 5 begins.

[0026] The above-mentioned large-section subway tunnel lining steel reinforcement anti-collapse structure, through the connection of multiple connecting support rods 7, can effectively prevent the collapse of the secondary lining steel reinforcement during binding, thereby effectively improving safety. In addition, the waterproof reinforcement layer 2, sealing pad 8 and water-swelling waterstop 9 can further enhance the waterproof effect of the entire support structure.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A large-section subway tunnel lining steel bar anti-collapse structure, characterized in that: It includes multiple connecting support rods, which are arranged in rows at intervals along the circumferential and longitudinal directions of the primary support. After each connecting support rod is extended into the primary support concrete of the primary support, it passes through the waterproof layer and is fixedly connected to the main reinforcement of the grid arch frame. The bottom end of the connecting support rod is fixedly connected to the outer steel bars of the secondary lining structure, and the inner steel bars and the outer steel bars of the secondary lining structure are tied together by the tie bars of the secondary lining structure.

2. The large-section subway tunnel lining steel bar anti-collapse structure according to claim 1, characterized in that: The connecting support rod is in an inverted L shape, the top end of the connecting support rod is welded to the main reinforcement of the grid arch, and the bottom end of the connecting support rod is welded and fixed to the outer reinforcement of the secondary lining structure.

3. The large-section subway tunnel lining steel bar anti-collapse structure according to claim 2, characterized in that: The connecting support rod is formed by bending section steel.

4. The large-section subway tunnel lining steel bar anti-collapse structure according to claim 2 or 3, characterized in that: A sealing rubber pad is sleeved and fixed on the bottom end of the connecting support rod, and the sealing rubber pad is in sealing contact with the lower surface of the waterproof layer.

5. The large-section subway tunnel lining steel bar anti-collapse structure according to claim 2, characterized in that: A water-swelling water-stopping adhesive is provided between the bottom end of the connecting support rod and the outer steel bar contact surface of the secondary lining structure.

6. The large-section subway tunnel lining steel bar anti-collapse structure according to claim 1 or 5, characterized in that: It also includes a waterproof reinforcement layer, which is laid between the primary waterproof layer and the primary reinforcement layer. The upper and lower surfaces of the waterproof reinforcement layer can be sealed and connected to the contact surface between the primary waterproof layer and the primary reinforcement layer respectively.

Images