Cover arch structure of zero-excavation tunnel portal

Abstract

The utility model discloses a cover arch structure of a tunnel zero-excavation portal, and belongs to the technical field of tunnel construction.The cover arch structure comprises a mountain tunnel, a cover arch frame is fixedly installed on the front side of the mountain tunnel, the cover arch frame is formed by combining a plurality of arc-shaped arch frames, and an outer formwork is fixedly connected to the outer wall of the cover arch frame; an inner template is fixedly connected to the interior of the cover arch frame; the closed space is defined outside the cover arch frame through cooperation of the outer formwork and the inner formwork to be used for pouring concrete, it is guaranteed that the concrete cannot overflow in the pouring process, the cover arch frame plays a supporting and positioning role, the inner formwork is supported by arranging the supporting assembly, and the concrete pouring efficiency is improved. And the stability and quality in the concrete pouring process are ensured, so that a stable cover arch structure can be formed, the tunnel portal can be effectively supported under the condition that large-scale excavation is not carried out, the goal of zero excavation is achieved, and damage to the surrounding environment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a sleeve arch structure of a tunnel zero-excavation portal. BACKGROUND

[0002] In tunnel engineering construction, the traditional methods mainly include open cut method, shield method and pipe jacking method, etc. The open cut method constructs a tunnel by excavating a large area of ground, which is simple in construction but has a huge impact on the surrounding environment, especially in the city center. The shield method forms a tunnel by large mechanical equipment underground, which has high automation degree and low ground interference, but the equipment is expensive and the application range is limited. The pipe jacking method uses hydraulic jacks to push prefabricated pipes into the soil layer, which is suitable for short-distance tunnel construction, but the efficiency is low in long-distance construction. In addition, there are some emerging technical means, such as the application of horizontal directional drilling technology and micro tunnel boring machine, which show certain advantages in specific scenarios, but still have problems such as high cost and difficult construction.

[0003] The main defect of the prior art is that it causes great damage to the surrounding environment, which not only affects the safety of ground vegetation and buildings, but also may cause changes in underground water level and soil pollution, so the traditional excavation method obviously cannot meet the requirements of modern urban construction on environmental protection, therefore, the sleeve arch structure of a tunnel zero-excavation portal is improved. CONTENT OF THE INVENTION

[0004] In view of the defects of the prior art, the present application provides a sleeve arch structure of a tunnel zero-excavation portal, which overcomes the defects of the prior art and aims to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a sleeve arch structure of a tunnel zero-excavation portal, comprising a mountain tunnel, a sleeve arch frame is fixedly installed on the front side of the mountain tunnel, the sleeve arch frame is composed of a plurality of arc-shaped arch frames, an outer formwork is fixedly connected to the outer wall of the sleeve arch frame, an inner formwork is fixedly connected to the inside of the sleeve arch frame, the outer formwork and the inner formwork enclose a closed annular space and the inside is poured with concrete, a support assembly is arranged between the inner formwork and the mountain tunnel, the support assembly is composed of a plurality of steel pipes, one end of the steel pipe is fixedly welded to the inner wall of the inner formwork, the other end of the steel pipe is fixed to the rock wall of the mountain tunnel through expansion screws.

[0006] Through the cooperation between the outer formwork and the inner formwork, a closed space is formed outside the sleeve arch frame for pouring concrete, so that the concrete does not overflow during pouring, the sleeve arch frame plays a role of supporting and positioning, the inner formwork is supported by the supporting assembly, and the stability and quality during concrete pouring are ensured, so that a stable sleeve arch structure can be formed, the effective support of the tunnel portal can be realized without large-scale excavation, the zero excavation target is achieved, and the damage to the surrounding environment is reduced.

[0007] As a preferred technical solution of the present application, the top of the sleeve arch frame is provided with a plurality of reinforcing ribs at equal intervals along the curvature thereof, and the reinforcing ribs are fixed and bundled on the top of the sleeve arch frame by steel wires.

[0008] Through the above technical solution, the strength and stability of the sleeve arch frame can be improved by arranging the reinforcing ribs, and the equal interval arrangement means that the reinforcing ribs are uniformly distributed on the top of the sleeve arch frame to ensure uniform transmission and dispersion of force, so that the finally formed sleeve arch structure has high strength.

[0009] As a preferred technical solution of the present application, the bottom of each of the arc-shaped arch frames is fixedly welded with a positioning block, an installation hole is formed through the upper surface of the positioning block, and an expansion screw is slidably inserted into the installation hole.

[0010] Through the cooperation between the positioning block, the installation hole and the expansion screw, the arc-shaped arch frame is fixedly installed on the ground.

[0011] As a preferred technical solution of the present application, a plurality of connecting steel pipes are fixedly welded between any two adjacent arc-shaped arch frames, and the lengths of the connecting steel pipes are the same.

[0012] Through the above technical solution, the distance between the two adjacent arc-shaped arch frames is ensured to be the same, so that the two adjacent arc-shaped arch frames are arranged in parallel, and the overall stability of the sleeve arch frame is improved.

[0013] As a preferred technical solution of the present application, each of the arc-shaped arch frames is assembled by two assembling plates one and one assembling plate two, the lower end of the assembling plate one is fixedly welded on the positioning block, the upper end of the assembling plate one is provided with a flange plate one, the two ends of the assembling plate two are both provided with a flange plate two, and the flange plate one and the flange plate two are fixedly connected into an integral whole by connecting bolts.

[0014] Through the cooperation between the flange plate one, the flange plate two and the connecting bolts, the two assembling plates one and the assembling plate two are fixedly assembled together to form a complete arc-shaped arch frame.

[0015] As a preferred technical solution of the present application, the assembling plate one and the assembling plate two are both made of high-strength alloy steel and are both prepared by factory precast.

[0016] By adopting the above technical solution, the high-strength alloy steel has high toughness and corrosion resistance, which means that the assembling plate one and the assembling plate two have high strength and hardness and can bear greater load and stress, thereby enhancing the safety and stability of the whole structure.

[0017] As a preferred technical solution of the present application, the outer formwork and the inner formwork are both coated with a release agent on the side close to the concrete.

[0018] By adopting the above technical solution, the outer formwork and the inner formwork can be easily removed after the concrete solidifies.

[0019] Compared with the prior art, the present application has the beneficial effects that:

[0020] 1. In the present application, the outer formwork and the inner formwork cooperate to form a closed space outside the sleeve arch frame for pouring concrete, ensuring that the concrete does not overflow during pouring. The sleeve arch frame serves as a support and positioning function. The stability and quality of the concrete during pouring are ensured by the support assembly supporting the inner formwork, thereby forming a stable sleeve arch structure. This can effectively support the tunnel portal without large-scale excavation, achieving the goal of zero excavation and reducing damage to the surrounding environment.

[0021] 2. In the present application, the reinforcing ribs improve the strength and stability of the sleeve arch frame. The connecting steel pipes ensure that the distance between the two adjacent arc-shaped arches is the same, allowing the two adjacent arc-shaped arches to be arranged in parallel, which helps to improve the overall stability of the sleeve arch frame. Since the assembling plate one and the assembling plate two are precast by the factory, the amount of work on site can be reduced, the construction period can be shortened, and the construction cost can be reduced.

[0022] The specific embodiments of the present application are disclosed in detail in the following description and drawings, which indicate the principles of the present application that can be adopted. It should be understood that the embodiments of the present application are not limited in scope. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0024] Figure 1It is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 It is a schematic diagram of the complete structure of the arch frame of the present application;

[0026] Figure 3 It is a schematic diagram of the component structure of the arch frame of the present application;

[0027] Figure 4 It is a schematic diagram of the component structure of the arch frame of the present application.

[0028] In the figure: 1, mountain tunnel; 2, arch frame; 21, arc-shaped arch frame; 211, assembly plate one; 212, assembly plate two; 213, flange plate one; 214, flange plate two; 22, positioning block; 23, mounting hole; 24, connecting steel pipe; 3, reinforcing rib; 4, inner formwork; 5, outer formwork; 6, concrete; 7, support assembly. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described in conjunction with the specific embodiments.

[0030] As shown in Figure 1 - Figure 4 The arch structure of the present application provides a tunnel zero-excavation portal, which comprises a mountain tunnel 1, a front side of the mountain tunnel 1 is fixedly installed with an arch frame 2, the arch frame 2 is composed of a plurality of arc-shaped arch frames 21, an outer wall of the arch frame 2 is fixedly connected with an outer formwork 5, an inner wall of the arch frame 2 is fixedly connected with an inner formwork 4, the outer formwork 5 and the inner formwork 4 jointly form a closed annular space, and the closed annular space is filled with concrete 6, a support assembly 7 is arranged between the inner formwork 4 and the mountain tunnel 1, the support assembly 7 is composed of a plurality of steel pipes, one end of the steel pipe is fixedly welded to the inner wall of the inner formwork 4, the other end of the steel pipe is fixed to the rock wall of the mountain tunnel 1 through an expansion screw, in use, a closed space is formed outside the arch frame 2 through the cooperation between the outer formwork 5 and the inner formwork 4, and the closed space is used for pouring the concrete 6, so that the concrete 6 cannot overflow during pouring, the arch frame 2 plays a supporting and positioning role, the inner formwork 4 is supported through the support assembly 7, and the stability and quality of the concrete 6 during pouring are ensured, so that a stable arch structure can be formed, that is, effective support of the tunnel portal can be realized without large-scale excavation, the zero-excavation target is achieved, and damage to the surrounding environment is reduced.

[0031] In the present embodiment, as Figure 2As shown, the top of the sleeve arch frame 2 is provided with a plurality of reinforcing ribs 3 at equal intervals along its arc, and the reinforcing ribs 3 are fixed and bundled on the top of the sleeve arch frame 2 by steel wires. In use, the strength and stability of the sleeve arch frame 2 can be improved by arranging the reinforcing ribs 3. The equal intervals mean that the reinforcing ribs 3 are evenly distributed on the top of the sleeve arch frame 2 to ensure uniform transmission and dispersion of force, so that the finally formed sleeve arch structure has high strength.

[0032] In this embodiment, as shown in Figure 2 and 3 The bottom of each of the arc-shaped arches 21 is fixedly welded with a positioning block 22, and the upper surface of the positioning block 22 is provided with a mounting hole 23. An expansion screw is slidably inserted into the mounting hole 23. In use, the arc-shaped arch 21 is fixedly installed on the ground through the cooperation of the positioning block 22, the mounting hole 23 and the expansion screw.

[0033] In this embodiment, as shown in Figure 2 and 3 A plurality of connecting steel pipes 24 are fixedly welded between any two adjacent arc-shaped arches 21, and the lengths of the connecting steel pipes 24 are the same. In use, the spacing between the two adjacent arc-shaped arches 21 is ensured to be the same, so that the two adjacent arc-shaped arches 21 are arranged in parallel, thereby improving the overall stability of the sleeve arch frame 2.

[0034] In this embodiment, as shown in Figure 3 and 4 Each of the arc-shaped arches 21 is assembled by two assembling plates one 211 and one assembling plate two 212. The lower end of the assembling plate one 211 is fixedly welded on the positioning block 22, and the upper end of the assembling plate one 211 is provided with a flange plate one 213. The two ends of the assembling plate two 212 are provided with flange plates two 214. The flange plate one 213 is fixedly connected with the flange plate two 214 by connecting bolts to form an integral whole. In use, the two assembling plates one 211 and the assembling plate two 212 are fixedly assembled together to form a complete arc-shaped arch 21 through the cooperation of the flange plate one 213, the flange plate two 214 and the connecting bolts.

[0035] In this embodiment, as shown in Figure 3 and 4 The assembling plate one 211 and the assembling plate two 212 are made of high-strength alloy steel and are pre-fabricated in the factory. In use, the high-strength alloy steel has high toughness and corrosion resistance, which means that the assembling plate one 211 and the assembling plate two 212 have high strength and hardness and can withstand greater load and stress, thereby enhancing the safety and stability of the entire structure. Since the assembling plate is pre-fabricated in the factory, the amount of on-site construction work can be reduced, the construction period can be shortened, and the construction cost can be reduced.

[0036] In the present embodiment, as shown in Figure 1 The outer formwork 5 and the inner formwork 4 are coated with a release agent on the side close to the concrete 6, which ensures that the outer formwork 5 and the inner formwork 4 can be easily removed after the concrete 6 solidifies.

[0037] The working principle of the utility model is: when the tunnel zero-excavation hole sleeve arch structure of the utility model is used, two assembling plates one 211 and one assembling plate two 212 are fixed and assembled together to form a complete arc-shaped arch frame 21 through the cooperation between flange plate one 213, flange plate two 214 and connecting bolts, then the arc-shaped arch frame 21 is fixed and installed on the ground through the cooperation between positioning block 22, mounting hole 23 and expansion screws, then a plurality of arc-shaped arch frames 21 are fixed and welded together to build a complete sleeve arch frame 2 through connecting steel pipes 24, and a reinforcing rib 3 is tied on the top of the sleeve arch frame 2, after the reinforcing rib 3 is fixed, the outer formwork 5 and the inner formwork 4 can be installed outside the sleeve arch frame 2, and a supporting assembly 7 is arranged to support the inner formwork 4, after the above preparation work is completed, the concrete 6 can be poured, and a stable sleeve arch structure is formed after the concrete 6 is completely solidified, which effectively supports the tunnel hole.

[0038] In the description of the utility model, it should be explained that the positions or position relations indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end" and "the other end" are based on the positions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "installation", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication between two elements. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to specific conditions.

[0040] The utility model has been described above in combination with specific embodiments, but those skilled in the art should know that these descriptions are exemplary and are not limiting the protection scope of the utility model. Those skilled in the art can make various modifications and changes to the utility model according to the spirit and principles of the utility model, and these modifications and changes are also within the scope of the utility model.

Claims

1. A tunnel zero-excavation portal arch structure comprising a mountain tunnel (1), characterized in that, The mountain tunnel (1) is provided with a sleeve arch frame (2) fixedly installed on the front side, the sleeve arch frame (2) is composed of a plurality of arc-shaped arch frames (21), the outer wall of the sleeve arch frame (2) is fixedly connected with an outer formwork (5), the inside of the sleeve arch frame (2) is fixedly connected with an inner formwork (4), the outer formwork (5) and the inner formwork (4) enclose a closed annular space and the inside of the annular space is poured with concrete (6), a supporting assembly (7) is arranged between the inner formwork (4) and the mountain tunnel (1), the supporting assembly (7) is composed of a plurality of steel pipes, one end of the steel pipe is fixedly welded on the inner wall of the inner formwork (4), the other end of the steel pipe is fixed on the rock wall of the mountain tunnel (1) through an expansion screw.

2. A sleeve arch structure for a tunnel zero-excavation portal according to claim 1, characterized in that, A plurality of reinforcing ribs (3) are arranged at equal intervals on the top of the sleeve arch frame (2) along the curvature, the reinforcing ribs (3) are fixedly bundled on the top of the sleeve arch frame (2) by steel wires.

3. A sleeve arch structure for a tunnel zero-excavation portal according to claim 1, characterized in that, The bottom of each of the arc-shaped arch frames (21) is fixedly welded with a positioning block (22), the upper surface of the positioning block (22) is provided with an installation hole (23) penetratingly formed, and an expansion screw is slidably inserted into the installation hole (23).

4. A sleeve arch structure for a tunnel zero-excavation portal according to claim 1, characterized in that, A plurality of connecting steel pipes (24) are fixedly welded between any two adjacent arc-shaped arch frames (21), and the lengths of the connecting steel pipes (24) are the same.

5. A sleeve arch structure for a tunnel zero-excavation portal according to claim 3, characterized in that, Each of the arc-shaped arch frames (21) is assembled by two assembling plates one (211) and one assembling plate two (212), the lower end of the assembling plate one (211) is fixedly welded on the positioning block (22), the upper end of the assembling plate one (211) is provided with a flange plate one (213), both ends of the assembling plate two (212) are provided with a flange plate two (214), and the flange plate one (213) and the flange plate two (214) are fixedly connected into an integral whole by connecting bolts.

6. A sleeve arch structure for a tunnel zero-excavation portal according to claim 5, characterized in that, The assembling plate one (211) and the assembling plate two (212) are made of high-strength alloy steel and are prepared by factory prefabrication.

7. A sleeve arch structure for a tunnel zero-excavation portal according to claim 1, characterized in that, The side of the outer formwork (5) and the inner formwork (4) close to the concrete (6) is brushed with a release agent.

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