Underground coal mine integral pouring frame type air bridge

Abstract

The utility model belongs to the technical field of underground roadway ventilation, and particularly relates to an underground coal mine integral pouring frame type air bridge. Comprising an air bridge base, air bridge piers and a beam body, and the air bridge base, the air bridge piers and the beam body are of an integrally-poured reinforced concrete frame type structure. The air bridge base is fixed on a roadway bottom plate through a vertical anchor cable, and the air bridge pier is fixed on the side part of a roadway through a transverse anchor cable; the overall strength of the air bridge is improved, and the deformation resistance of the air bridge in a soft rock roadway with large mine ground pressure is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground roadway ventilation, and particularly relates to an integrally cast frame-type air bridge in coal mines. Background Art

[0002] An air bridge is a structure that separates fresh air flow from polluted air when the intake roadway and the return airway cross in a coal mine, and it is a common roadway layout structure in coal mining. The construction steps of the existing air bridge are as follows: First, the coal and rock mass in the areas of the air bridge piers on both sides of the roadway are excavated. After the exposed roadway sides are supported, stone masonry is used to build the air bridge piers. Then, concrete covers are built above the two side piers to separate the intake roadway from the return airway. In soft rock roadways with relatively large mine pressure, the roadway sides bulge, causing the overall displacement of the stone piers of the air bridge, and the roadway floor bulges, causing cracks and air leakage between the concrete cover of the air bridge and the piers, thus affecting the stability of the air flow. Content of the Utility Model

[0003] The utility model aims to solve the problem that in soft rock roadways with relatively large mine pressure, for the air bridge constructed by the existing construction method, the overall displacement of the stone piers of the air bridge occurs due to the bulging of the roadway sides, and cracks and air leakage are generated between the concrete cover of the air bridge and the piers due to the bulging of the roadway floor, thus affecting the stability of the air flow.

[0004] The utility model provides the following technical solution: An integrally cast frame-type air bridge in coal mines, comprising an air bridge base, air bridge piers and a beam body. The air bridge base, air bridge piers and beam body are of an integrally cast steel-concrete frame structure; the air bridge base is fixed on the roadway floor through vertical anchor cables, and the air bridge piers are fixed on the roadway sides through horizontal anchor cables.

[0005] Further, the air bridge base includes base I-beams, a base steel mesh and a base concrete slab. The base I-beams are distributed in the middle layer of the air bridge base. The base I-beams are connected to the air bridge piers on both sides. Base steel meshes are laid on both the upper and lower planes of the base I-beams. The framework formed by tying the base steel mesh to the base I-beams is cast in the base concrete slab. Anchor cable holes are opened on the base I-beams, and the vertical anchor cables pass through the anchor cable holes on the base I-beams and are fixed on the roadway floor.

[0006] Further, the air bridge piers include pier I-beams, a pier steel mesh and a pier concrete slab. The pier I-beams are distributed in the middle layer of the air bridge piers. The lower ends of the pier I-beams are embedded in the air bridge base. The pier I-beams and the base I-beams are cross-lapped and fixed with U-shaped clamps. Pier steel meshes are laid on both the left and right planes of the pier I-beams. The framework formed by tying the pier steel mesh to the pier I-beams is cast in the pier concrete slab. Anchor cable holes are opened on the pier I-beams, and the horizontal anchor cables pass through the anchor cable holes on the pier I-beams and are fixed on the roadway sides.

[0007] Furthermore, the beam body includes transverse I-beams of the beam body, longitudinal I-beams of the beam body, a steel mesh of the beam body, and a concrete slab of the beam body; the transverse I-beams of the beam body are lapped on the tops of the air bridge piers on both sides, the longitudinal I-beams of the beam body are cross-lapped on the tops of the transverse I-beams of the beam body, and the transverse I-beams of the beam body and the I-beams of the piers are cross-lapped and fixed with U-shaped clamps; steel meshes of the beam body are laid on the bottoms of the transverse I-beams of the beam body and the tops of the longitudinal I-beams of the beam body; the framework formed by binding and connecting the transverse I-beams of the beam body, the longitudinal I-beams of the beam body, and the steel mesh of the beam body is cast in the concrete slab of the beam body.

[0008] Compared with the prior art, the advantages of the present utility model are as follows:

[0009] The air bridge base, the air bridge piers, and the beam body are integrally cast to form a steel-concrete frame structure, which improves the overall strength of the air bridge and enhances the ability of the air bridge to resist deformation in soft rock roadways with relatively large mine pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of the present utility model.

[0011] In the figure: 1 - vertical anchor cable; 2 - horizontal anchor cable; 3 - base I-beam; 4 - base steel mesh; 5 - base concrete slab; 6 - pier I-beam; 7 - pier steel mesh; 8 - pier concrete slab; 9 - transverse I-beam of the beam body; 10 - longitudinal I-beam of the beam body; 11 - steel mesh of the beam body; 12 - concrete slab of the beam body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] As Figure 1 shown: An integrally cast frame-type air bridge in a coal mine underground includes an air bridge base, air bridge piers, and a beam body. The air bridge base, air bridge piers, and beam body are integrally cast steel-concrete frame structures; the air bridge base is fixed on the roadway floor through vertical anchor cables 1, and the air bridge piers are fixed on the roadway sidewalls through horizontal anchor cables 2.

[0014] The air bridge base includes base I-beams 3, base steel bar meshes 4, and base concrete slabs 5. The base I-beams 3 are distributed in the middle layer of the air bridge base. The base I-beams 3 connect the air bridge piers on both sides. Base steel bar meshes 4 are laid on both the upper and lower planes of the base I-beams 2. The framework formed by tying the base steel bar meshes 4 and the base I-beams 2 is poured into the base concrete slabs 5. Anchor cable holes are opened on the base I-beams 2, and the vertical anchor cable 1 passes through the anchor cable holes on the base I-beams 3 and is fixed on the roadway floor.

[0015] The air bridge piers include pier I-beams 6, pier steel bar meshes 7, and pier concrete slabs 8. The pier I-beams 6 are distributed in the middle layer of the air bridge piers. The lower ends of the pier I-beams 6 are embedded in the air bridge base. The pier I-beams 6 and the base I-beams 3 are cross-lapped and fixed with U-shaped clamps. Pier steel bar meshes 7 are laid on both the left and right planes of the pier I-beams 6. The framework formed by tying the pier steel bar meshes 7 and the pier I-beams 6 is poured into the pier concrete slabs 8. Anchor cable holes are opened on the pier I-beams 6, and the horizontal anchor cable 2 passes through the anchor cable holes on the pier I-beams 6 and is fixed on the roadway sidewall.

[0016] The beam body includes transverse beam I-beams 9, longitudinal beam I-beams 10, beam steel bar meshes 11, and beam concrete slabs 12; the transverse beam I-beams 9 are lapped on the tops of the air bridge piers on both sides, the longitudinal beam I-beams 10 are cross-lapped on the tops of the transverse beam I-beams 9, and the transverse beam I-beams 9 and the pier I-beams 6 are cross-lapped and fixed with U-shaped clamps; beam steel bar meshes 11 are laid on both the bottoms of the transverse beam I-beams 9 and the tops of the longitudinal beam I-beams 10; the framework formed by tying the transverse beam I-beams 9, the longitudinal beam I-beams 10, and the beam steel bar meshes 11 is poured into the beam concrete slabs 12.

[0017] During the construction of the integrally cast frame-type air bridge in the coal mine underground, first, the coal and rock masses in the construction areas of the air bridge piers on both sides of the roadway and the air bridge base in the roadway floor are excavated.

[0018] During the construction, drill holes are made in the excavated floor, anchoring agents are placed at the bottom of the holes, the steel strands of the vertical anchor cable 1 are inserted and stirred for anchoring; a layer of concrete is laid on the excavated floor. After the concrete begins to set, a layer of base I-beams 3 is laid on the concrete surface. The steel strands of the vertical anchor cable 1 are passed through the base I-beams 3. A layer of base steel bar meshes 4 is laid on each of the upper and lower planes of the base I-beams 3. The base I-beams 3 and the base steel bar meshes 4 are tied firmly with iron wires to form a framework; a row of pier I-beams 6 is installed in each of the excavation areas on both sides of the roadway sidewalls. A layer of pier steel bar meshes 7 is laid on each of the pier I-beams 6. The pier I-beams 6 and the pier steel bar meshes 7 are tied firmly with iron wires to form a framework. The overlapping parts of the base I-beams 3 and the pier I-beams 6 are fixed with U-shaped clamps. The excavation area of the floor is backfilled with concrete; after the air bridge base is completely solidified, an anchor cable tray and a locking device are installed at the exposed ends of the steel strands of the vertical anchor cable 1 and tensioned and pre-tightened.

[0019] After excavation, drill holes at the sidewalls, place anchor agents at the bottom of the holes, and insert the steel strands of the horizontal anchor cable 2 through the I-beam 6 of the bridge pier and into the drill holes for stirring and anchoring; use concrete to pour and backfill the excavated areas on both sides; after the entire air bridge pier solidifies, install an anchor cable tray and a locking device at the exposed end of the steel strand of the horizontal anchor cable 2, and tension and pre-tighten it.

[0020] Horizontally and vertically lay two layers of I-beams on the air bridge piers on both sides. At the lap joint between the two ends of the transverse I-beam 9 of the lower layer and the exposed section of the I-beam 6 of the bridge pier that exposes the air bridge pier, use U-shaped clamps to fix. Lay a layer of beam steel mesh 11 at the bottom of the transverse I-beam 9 of the beam body and at the top of the longitudinal I-beam 10 of the beam body, and use iron wire to tie the I-beam and the beam steel mesh 11 firmly to form a skeleton; use concrete to pour the top to form the beam body.

[0021] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrally cast frame type wind bridge in a coal mine, characterized in that: The wind bridge comprises a wind bridge base, wind bridge piers and a beam body, wherein the wind bridge base, wind bridge piers and beam body are integrally cast steel-concrete frame structures; the wind bridge base is fixed to the tunnel bottom plate by vertical anchor cables (1), and the wind bridge piers are fixed to the tunnel side by transverse anchor cables (2).

2. The integrally cast frame type wind bridge for underground coal mine according to claim 1 is characterized in that: The wind bridge base comprises a base I-beam (3), a base steel mesh (4) and a base concrete slab (5). The base I-beam (3) is distributed in the middle layer of the wind bridge base. The base I-beam (3) connects the wind bridge piers on both sides. The upper and lower planes of the base I-beam (3) are paved with a base steel mesh (4). The base steel mesh (4) and the base I-beam (3) are tied together to form a skeleton cast in the base concrete slab (5). Anchor cable holes are opened on the base I-beam (3). The vertical anchor cables (1) pass through the anchor cable holes on the base I-beam (3) and are fixed to the tunnel bottom plate.

3. The integrally cast frame type wind bridge for underground coal mine according to claim 2 is characterized in that: The wind bridge pier comprises a pier I-beam (6), a pier steel mesh (7) and a pier concrete slab (8). The pier I-beam (6) is distributed in the middle layer of the wind bridge pier. The lower end of the pier I-beam (6) is pre-buried in the wind bridge base. The pier I-beam (6) and the base I-beam (3) are cross-lapped and fixed with U-shaped clips. The left and right planes of the pier I-beam (6) are paved with pier steel mesh (7). The skeleton formed by the pier steel mesh (7) and the pier I-beam (6) are cast in the pier concrete slab (8). Anchor cable holes are opened on the pier I-beam (6). The transverse anchor cable (2) passes through the anchor cable holes on the pier I-beam (6) and is fixed on the side of the roadway.

4. The integrally cast frame type wind bridge in underground coal mine according to claim 3, characterized in that: The beam body comprises a beam body transverse I-beam (9), a beam body longitudinal I-beam (10), a beam body steel mesh (11) and a beam body concrete slab (12); the beam body transverse I-beam (9) is overlapped on the top of the wind bridge piers on both sides, the beam body longitudinal I-beam (10) is cross-overlapped on the top of the beam body transverse I-beam (9), the beam body transverse I-beam (9) and the pier I-beam (6) are cross-overlapped and fixed with U-shaped clips; the bottom of the beam body transverse I-beam (9) and the top of the beam body longitudinal I-beam (10) are both paved with a beam body steel mesh (11); the skeleton formed by binding and connecting the beam body transverse I-beam (9), the beam body longitudinal I-beam (10) and the beam body steel mesh (11) is cast in the beam body concrete slab (12).

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