A tunnel surrounding rock support device

Abstract

This utility model relates to the technical field of tunneling, and discloses a tunneling surrounding rock support device, including multiple anchor rods and a steel mesh. Each anchor rod includes a threaded rod with an anchor body sleeved on its upper end. A limiting plate is sleeved on the lower end of the threaded rod, and a nut is threaded onto the side wall of the threaded rod at the lower end of the limiting plate. The steel mesh is located between the limiting plate and the surrounding rock, and is tied and fixedly sleeved on the outside of the threaded rod in an arched shape. An anchor rod inserted into a recessed area of ​​the surrounding rock has two limiting plates and corresponding threaded rods, with the limiting plates respectively attached to the surrounding rock and the steel mesh. A second steel mesh is located between the limiting plate and the surrounding rock within the limiting plate. Multiple bent steel support rods are located within the steel mesh in the recessed area of ​​the surrounding rock. The advantages of this utility model compared to existing technologies are: sufficient concrete grouting filling and good support effect.

Description

Technical Field

[0001] This utility model relates to the field of tunnel-related technology, specifically to a tunnel surrounding rock support device. Background Technology

[0002] A roadway is a passageway carved between the surface and the ore body, used for purposes such as ore transportation, ventilation, drainage, pedestrian access, and equipment installation. Roadway rock support refers to the support devices installed after roadway excavation to prevent deformation and collapse of the surrounding rock or to maintain the stability and safety of the roadway.

[0003] The support system consists of anchor bolts installed by drilling holes in the roadway, steel mesh installed on the anchor bolts, and concrete grouting to form the support layer.

[0004] Therefore, the following shortcomings exist: the uneven surface of the surrounding rock makes it difficult for the steel mesh to fit tightly with the surrounding rock, which can easily cause voids between the surrounding rock and the steel mesh during concrete grouting, affecting the support effect. Utility Model Content

[0005] I. Technical problems to be solved

[0006] The technical problem this invention aims to solve is that concrete grouting between the steel mesh and the surrounding rock can easily create voids, resulting in poor support performance.

[0007] II. Technical Solution

[0008] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a roadway surrounding rock support device, comprising multiple anchor bolts and a steel mesh;

[0009] The anchor rod includes a screw rod, an anchor body sleeved on the upper end of the screw rod, a limiting plate sleeved on the lower end of the screw rod, a nut threaded onto the side wall of the screw rod at the lower end of the limiting plate, and a steel mesh located between the limiting plate and the surrounding rock, which is tied and fixed to the outside of the screw rod in an arch shape.

[0010] The anchor bolt inserted into the concave part of the surrounding rock is equipped with two limiting plates and corresponding screws. The limiting plates are respectively attached to the surrounding rock and the steel mesh. A steel mesh is provided between the limiting plate located in the surrounding rock and the surrounding rock.

[0011] The steel mesh in the concave part of the surrounding rock is provided with multiple curved steel bars.

[0012] As an improvement, the anchor body is composed of a frustum and a column from top to bottom, and the outer wall of the column is provided with multiple rings with triangular cross-sections along the vertical direction.

[0013] As an improvement, both the steel mesh and the steel mesh II are made of multiple transverse and longitudinal steel bars welded together to form a mesh.

[0014] As an improvement, the steel mesh II is fixed to the steel mesh by binding.

[0015] As an improvement, multiple steel reinforcement supports pass through the steel mesh and are attached to the inner wall of the surrounding rock, with equal spacing between them, and the steel reinforcement supports are welded to the steel mesh.

[0016] As an improvement, the steel bar support rod is connected at both ends and has multiple interconnected injection ports on its side wall.

[0017] III. Beneficial Effects

[0018] The advantages of this utility model compared with the prior art are as follows:

[0019] This utility model uses anchor rods with double limiting plates to cooperate with steel mesh and steel mesh 2, and designs groutable steel bar supports to make the steel mesh tightly fit with the surrounding rock surface, and the steel mesh 2 and grouting steel bars tightly fit with the surrounding rock surface in the concave area. After concrete grouting, the space between the surrounding rock and the steel mesh can be fully filled to ensure the support effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the installation of a roadway surrounding rock support device within the roadway surrounding rock according to this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of a roadway surrounding rock support device installed in the surrounding rock of a roadway, according to this utility model. Figure 2 .

[0022] Figure 3 This is an exploded view of a tunnel surrounding rock support device according to this utility model.

[0023] Figure 4 This is an internal structural diagram of the anchor rod of a roadway surrounding rock support device according to this utility model.

[0024] As shown in the figure: 1. Anchor bolt; 2. Reinforcing mesh; 3. Screw; 4. Anchor body; 5. Limiting plate; 6. Nut; 7. Reinforcing bar support; 8. Injection port; 9. Reinforcing mesh II. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] As attached Figure 1-4 As shown, a roadway surrounding rock support device includes multiple anchor bolts 1 and a steel mesh 2.

[0028] The anchor rod 1 includes a screw rod 3 and an anchor body 4 sleeved on the upper end of the screw rod 3. The screw rod 3 is made of HRB400 threaded steel with a diameter of 20-25mm and a length of 1.8-2.5m. The anchor body 4 consists of a frustum and a column from top to bottom. The outer wall of the column has multiple rings with triangular cross sections along the vertical direction. The lower end of the screw rod 3 is sleeved with a limiting plate 5. The limiting plate 5 has a serrated contact surface near the rock surface. The side wall of the screw rod 3 at the lower end of the limiting plate 5 is threaded with a nut 6. After the anchor rod 1 is inserted into the surrounding rock, it is fixed by tightening the nut 6, so that the limiting plate 5 is in close contact with the surface of the surrounding rock.

[0029] The steel mesh 2 is located between the limiting plate 5 and the surrounding rock. The steel mesh 2 is formed by welding multiple transverse and longitudinal steel bars to form a mesh. The steel mesh 2 is in contact with the smooth surface of the surrounding rock and is tied and fixed to the outside of the screw rod 3 in an arch shape. The anchor rod 1 inserted into the concave part of the surrounding rock is provided with two limiting plates 5 and corresponding screw rods 3. The limiting plates 5 are in contact with the surrounding rock and the steel mesh 2 respectively. A second steel mesh 9 is provided between the limiting plate 5 and the surrounding rock. The second steel mesh 9 is formed by welding multiple transverse and longitudinal steel bars to form a mesh, which can adapt to the concave shape of the surrounding rock. The second steel mesh 9 is fixed to the steel mesh 2 by binding. The position of the second steel mesh 9 is fixed. Concrete grouting is performed on the second steel mesh 9 first, and then concrete grouting is performed on the outer steel mesh 2 to effectively eliminate voids.

[0030] The steel mesh 2 in the concave part of the surrounding rock is provided with multiple curved steel bar supports 7. The multiple steel bar supports 7 pass through the steel mesh 2 and are attached to the inner wall of the surrounding rock with equal spacing. The steel bar supports 7 are welded to the steel mesh 2. The two ends of the steel bar supports 7 are connected, and the side wall is provided with multiple interconnected injection ports 8. Grouting can be continued to be injected into the steel bar supports 7 to fill the internal cracks of the rock mass from the injection ports 8, effectively eliminating voids and significantly improving the overall strength and deformation resistance of the surrounding rock.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

[0033] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A roadway surrounding rock support device, comprising multiple anchor bolts (1) and a steel mesh (2), characterized in that: The anchor rod (1) includes a screw rod (3), an anchor body (4) is provided on the upper end of the screw rod (3), a limiting plate (5) is sleeved on the lower end of the screw rod (3), a nut (6) is threaded on the side wall of the screw rod (3) at the lower end of the limiting plate (5), and the steel mesh (2) is located between the limiting plate (5) and the surrounding rock, and is tied and fixed on the outside of the screw rod (3) in an arch shape; An anchor rod (1) inserted into the concave part of the surrounding rock is provided with two limiting plates (5) and corresponding screws (3), and the limiting plates (5) are respectively attached to the surrounding rock and the steel mesh (2). A steel mesh (9) is provided between the limiting plate (5) located in the surrounding rock and the surrounding rock. The steel mesh (2) in the concave part of the surrounding rock is provided with multiple curved steel bar supports (7).

2. The tunnel surrounding rock support device according to claim 1, characterized in that: The anchor body (4) consists of a frustum and a column from top to bottom. The outer wall of the column is provided with multiple rings with triangular cross sections along the vertical direction.

3. The tunnel surrounding rock support device according to claim 1, characterized in that: Both the steel mesh (2) and the steel mesh II (9) are made of multiple transverse and longitudinal steel bars welded together to form a mesh.

4. A roadway surrounding rock support device according to claim 3, characterized in that: The steel mesh 2 (9) and the steel mesh (2) are fixed together by binding.

5. A tunnel surrounding rock support device according to claim 1, characterized in that: Multiple steel reinforcement bars (7) pass through the steel mesh (2) and are attached to the inner wall of the surrounding rock, with equal spacing between them. The steel reinforcement bars (7) are welded to the steel mesh (2).

6. A tunnel surrounding rock support device according to claim 5, characterized in that: The steel bar support (7) is connected between its two ends and has multiple interconnected injection ports (8) on its side wall.

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