Underground coal mine large-section combination column reinforcing structure

Abstract

The utility model discloses an underground coal mine large-section combination column reinforcing structure, which relates to the technical field of roadway construction, and comprises an upper base, a lower base and a middle straight beam, the upper base and the lower base have the same structure and are respectively provided with a steel plate and U-shaped steel vertically welded on the steel plate, and the steel plate is provided with a drill hole for installing an anchor rod; the middle straight beam is a U-shaped steel straight beam, and the two ends of the middle straight beam are connected with the upper base and the lower base respectively. The technical problem that in the prior art, when the span of a coal mine roadway is large, rock of a roadway top plate has the caving risk is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a large-section combined column reinforcement structure in an underground coal mine. Background Art

[0002] Underground large-section support refers to a structural reinforcement and stability maintenance technology implemented in areas with large spatial spans, complex geological conditions, and high support difficulties during mining or underground engineering excavation. This support technology aims to effectively resist the deformation and damage of the surrounding rock mass by building a stable support system to ensure the safety and stability of the operating area.

[0003] At present, underground large-section support widely adopts a combination of multiple tools and technical means. Among them, steel arch support is one of the common forms. In conventional operations, prefabricated or on-site assembled steel arches are installed, combined with anchor rods, shotcrete and other materials to form a continuous load-bearing structure to disperse and resist the surrounding rock pressure.

[0004] During the implementation process, the inventors found that the above-mentioned prior art has at least the following defects: as the equipment of the coal mine tunnel increases, the tunnel span is also gradually increasing, and the pressure it bears is much higher than that of the small-section tunnel, so there is a risk of rock falling from the tunnel roof. Utility Model Content

[0005] The embodiment of the present application solves the technical problem in the prior art that when the span of a coal mine tunnel is large, there is a risk of rock on the tunnel roof falling off by providing a large-section combined column reinforcement structure in an underground coal mine.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme: a large-section composite column reinforcement structure for underground coal mines, comprising an upper base, a lower base and an intermediate straight beam. The upper base has the same structure as the lower base, and is provided with a steel plate and a U-shaped steel vertically welded to the steel plate. The steel plate is provided with a drill hole for installing an anchor rod; the intermediate straight beam is a U-shaped steel straight beam, and the two ends of the intermediate straight beam are respectively connected to the upper base and the lower base.

[0007] The relatively large cross-section can be effectively divided into two smaller cross-sections through the upper base, the lower base and the middle straight beam. Therefore, when this structure is set in the middle of the tunnel, the pressure in the middle of the tunnel can be reduced. By using this structure to bear the pressure in the middle of the tunnel, the stress of the roof can be redistributed, which can effectively enhance the overall stability of the support structure and reduce the risk of rock falling from the tunnel roof.

[0008] Furthermore, the length, width and thickness of the steel plate are 700 mm, 700 mm and 20 mm respectively, and the drill holes are distributed at the four corners of the steel plate and are 50 mm away from the edge of the steel plate.

[0009] Furthermore, three U-shaped steels are vertically welded on the surface of the steel plate, and the three U-shaped steels are evenly distributed and respectively located at three equally divided points on the surface of the steel plate.

[0010] Furthermore, the upper and lower ends of the middle straight beam are overlapped on the upper base and the lower base respectively, and the overlap length is not less than 500 mm, and the overlaps between the middle straight beam and the upper base and the lower base are fastened with cable clamps.

[0011] Furthermore, an anchor rod is passed through the drilled hole of the steel plate in the upper base, and the anchor rod can fix the upper base to the tunnel roof, and the length of the anchor rod is not less than 2000 mm.

[0012] Furthermore, the length of the middle straight beam is not less than 2000 mm.

[0013] It can be seen from the above technical solutions that the utility model has at least the following technical effects or advantages:

[0014] The upper base, the lower base and the middle straight beam can effectively divide a relatively large section into two smaller sections. Therefore, when the structure is set in the middle of the tunnel, the pressure in the middle of the tunnel can be reduced. The structure is used to bear the pressure in the middle of the tunnel and redistribute the stress of the roof, which can effectively enhance the overall stability of the support structure, thereby reducing the risk of rock falling from the tunnel roof. In addition, the combined arch established by the anchor rods and the structure are used together to support, further improving the support effect and ensuring the stability and safety of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0016] Figure 1 It is a schematic diagram of the use structure of the utility model;

[0017] Figure 2 is the front view of the upper base;

[0018] Figure 3 for Figure 2 Side view of

[0019] Figure 4 for Figure 2 Bottom view of .

[0020] Explanation of the accompanying drawings: 1. upper base, 2. lower base, 3. middle straight beam, 4. drill hole, 5. steel plate, 6. U-shaped steel, 7. cable, 8. anchor rod. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0022] The utility model discloses a large-section composite column reinforcement structure for underground coal mines. Figure 1 As shown, it includes an upper base 1, a lower base 2 and a middle straight beam 3. The upper base 1 is fixed to the tunnel roof through an anchor rod 8, the lower base 2 is located below the upper base 1 and fixed to the ground, and the middle straight beam 3 is supported between the lower base 2 and the upper base 1, dividing the tunnel section into two sections to achieve the redistribution of the roof stress. By dividing the sections, the risk of rock falling from the roof is reduced, and the support stability and safety are improved.

[0023] The upper base 1 has the same structure as the lower base 2. In this embodiment, the upper base 1 is taken as an example. Figure 2 As shown, the upper base 1 includes a steel plate 5 and a U-shaped steel 6. The length, width and thickness of the steel plate 5 are 700 mm, 700 mm and 20 mm respectively, and the edges of the steel plate 5 are provided with a drill hole 4 with a diameter of 28 mm, and the center of the drill hole 4 is 50 mm away from the edge of the steel plate 5. An anchor rod 8 can be passed through the drill hole 4, and then the upper base 1 is fixed to the top plate of the tunnel with an anchor rod cap. Among them, the length of the anchor rod 8 is not less than 2000 mm, and the length of the anchoring agent is not less than 1000 mm.

[0024] At least three U-shaped steels 6 are welded on the surface of the steel plate 5. In this embodiment, welding three U-shaped steels 6 is taken as an example. Figure 2 As shown, the extension direction of the three U-shaped steels 6 is perpendicular to the surface of the steel plate 5, and the three U-shaped steels 6 are evenly distributed, each located at three equally divided points on the surface of the steel plate 5. That is, the notch of each U-shaped steel 6 points to the center of the steel plate 5, and the angle between two adjacent U-shaped steels 6 is equal to 120°, thereby forming a structure with the center of the steel plate 5 as the center point and the notches of the U-shaped steels 6 converging toward the center point, thereby enhancing the stability and bearing capacity of the structure.

[0025] The middle straight beam 3 is a U-shaped steel straight beam, and the upper and lower ends of the middle straight beam 3 are overlapped on the upper base 1 and the lower base 2 respectively, wherein the length of the middle beam is not less than 2000 mm, and the overlap length is not less than 500 mm. The overlaps between the middle straight beam 3 and the upper base 1 and the lower base 2 are fastened with cable 7, and the tightening torque is not less than 260 N·m, thereby ensuring the tight connection between the middle straight beam 3 and the upper base 1 and the lower base 2.

[0026] When carrying out the construction of large-section composite column reinforcement technology in coal mines, the operating steps are as follows:

[0027] First, on the top plate at the centerline position of the tunnel (according to the actual situation, if there are equipment or other obstacles, the position can be adjusted appropriately), the anchor rod 8 is constructed according to the pre-designed steel plate 5 drilling hole 4 position. The length of the anchor rod 8 must be no less than 2000mm to ensure its stability, and the length of the anchoring agent must not be less than 1000mm to enhance the bonding force between the anchor rod 8 and the top plate. Next, the upper base 1 is fixed to the installed anchor rod 8 with the anchor cap to ensure that the upper base 1 is stable and does not shake. Subsequently, the processed middle straight beam 3 is overlapped on the upper base 1, and the overlap length must be no less than 500mm to ensure the connection strength between the U-shaped steel 6 and the upper base 1. After the overlap is completed, it is tightened with a cable 7, and the tightening torque is ensured to be no less than 260N·m. When the middle straight beam 3 is installed close to the bottom plate of the tunnel, the lower base 2 is installed in the same way to form a complete structure.

[0028] Through this structure, the span of the tunnel is effectively reduced, the risk of rock falling from the tunnel roof is reduced, and the overall stability and safety of the tunnel are improved.

[0029] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in their embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novelties disclosed herein.

Claims

1. A large-section composite column reinforcement structure in a coal mine, characterized in that: The invention comprises an upper base (1), a lower base (2) and an intermediate straight beam (3); the upper base (1) and the lower base (2) have the same structure, both being provided with a steel plate (5) and a U-shaped steel (6) vertically welded to the steel plate (5); the steel plate (5) being provided with a drilling hole (4) for installing an anchor rod (8); and the intermediate straight beam (3) being a U-shaped steel straight beam, the two ends of which are respectively connected to the upper base (1) and the lower base (2).

2. A large-section composite column reinforcement structure for underground coal mines according to claim 1, characterized in that: The length, width and thickness of the steel plate (5) are 700 mm, 700 mm and 20 mm respectively. The drill holes (4) are distributed at the four corners of the steel plate (5) and are 50 mm away from the edge of the steel plate (5).

3. The large-section composite column reinforcement structure for underground coal mines according to claim 2, characterized in that: Three U-shaped steels (6) are vertically welded to the surface of the steel plate (5), and the three U-shaped steels (6) are evenly distributed and are respectively located at three equally divided points on the surface of the steel plate (5).

4. The large-section composite column reinforcement structure for underground coal mines according to claim 3, characterized in that: The upper and lower ends of the middle straight beam (3) are respectively overlapped on the upper base (1) and the lower base (2), and the overlap length is not less than 500 mm. The overlaps between the middle straight beam (3) and the upper base (1) and the lower base (2) are fastened using cable clamps (7).

5. The large-section composite column reinforcement structure for underground coal mines according to claim 4, characterized in that: An anchor rod (8) is inserted into the drill hole (4) of the steel plate (5) in the upper base (1). The anchor rod (8) can fix the upper base (1) to the tunnel roof. The length of the anchor rod (8) is not less than 2000 mm.

6. A large-section composite column reinforcement structure for underground coal mines according to claim 4, characterized in that: The length of the middle straight beam (3) is not less than 2000 mm.

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