Coal mine underground machine head chamber supporting structure

Abstract

The utility model relates to the technical field of mine supporting, in particular to a coal mine underground machine head chamber supporting structure which comprises a chamber body, the chamber body is located at the tail end of a stope face transportation crossheading and used for connecting the transportation crossheading and a main transportation roadway, and a machine head part of a belt conveyor arranged in the transportation crossheading is located in the chamber body. The top direction and the side direction of the chamber body are composed of double-layer supporting structures arranged between the chamber body and the inner wall of a roadway, the double-layer supporting structures comprise the outer supporting layer directly connected with the roadway wall and the inner supporting layer located on the side of the outer supporting layer, and the problems that under the three-soft coal seam condition, a large-section roadway deforms seriously, and the supporting structures are unstable can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mine supporting technical field, specifically point to a coal mine underground machine head chamber supporting structure. BACKGROUND

[0002] With the exhaustion of coal resources in the middle and east of China, coal resources are transferred to the deep part, the mine geological condition is more and more complex, the surrounding rock deformation problem of soft rock roadway is serious, especially for three soft coal seam roadway, under the influence of various factors, there are roof fall, two help loose broken, serious floor heave and other problems, it is difficult to guarantee the long-term stability of the roadway by using the traditional single supporting mode;

[0003] At the same time, the machine head chamber in the underground is often required to have a larger section to meet the equipment operation requirements, which puts forward greater challenges to the surrounding rock support of the roadway.

[0004] Therefore, a coal mine underground machine head chamber supporting structure is needed to solve the above problems. UTILITY MODEL CONTENT

[0005] (I) Technical problem

[0006] The utility model aims at at least solving the problem of insufficient stability of machine head chamber supporting under the condition of weak lithology in the prior art.

[0007] (II) Technical content

[0008] The utility model provides a coal mine underground machine head chamber supporting structure, which is achieved by the following specific technical means: including chamber body, the chamber body is located in the end of the haulage face transportation crossheading, and is used for connecting the transportation crossheading and the transportation roadway;

[0009] The chamber body top and side are composed of double-layer supporting structures arranged between the roadway inner wall, which are respectively an outer supporting layer directly connected with the roadway wall and an inner supporting layer located on the side of the outer supporting layer.

[0010] Optimal technical solution one: the longitudinal section of the chamber body has two forms, which are semicircular arch section or have an expanded roadway part on one side of the semicircular arch section, the expanded roadway part forms a rectangular niche for placing control box, hydraulic station, energy storage station, hydraulic pump station and other equipment.

[0011] Optimal technical solution two: the outer supporting layer is composed of a steel frame consistent with the outer shape of the chamber body and anchor rods and anchor cables connected to the steel frame at one end and anchored in the coal rock layer in the roadway at the other end, and the anchor rods and anchor cables are fixed on the steel frame through concrete.

[0012] Optimal technical solution three: the outer supporting layer further includes a plurality of groups of I-shaped steel frames arranged along the length direction of the chamber body and formed on the inner side of the steel frame.

[0013] The I-shaped steel frame is composed of a plurality of mutually matched profile splicing units which are spliced in sequence and are formed by welding I-shaped steel and connecting steel plates, and the profile splicing units are connected by bolts.

[0014] Preferably, the two adjacent groups of I-shaped steel frames are connected by tie rods.

[0015] Preferably, the inner support layer is a reinforced concrete with embedded steel bars, and cooperates with the outer support layer to form a combined support.

[0016] Preferably, a steel backing plate is welded at the bottom of each end of the I-shaped steel frame, an I-shaped bottom beam is used for roadway paving, and the steel backing plate is welded with the I-shaped bottom beam.

[0017] (Three) Technical effects

[0018] The above structure makes the present scheme have the following beneficial effects:

[0019] 1. The double-layer support structure can effectively prevent the problem of serious deformation of a large-section roadway in a three-soft coal seam and instability of the support structure.

[0020] 2. The rectangular niche formed by the expanded roadway portion can provide sufficient space for placing equipment such as control boxes, hydraulic stations, energy storage stations, and hydraulic pump stations, and ensure the smoothness of the main passage of the chamber. DETAILED DESCRIPTION

[0021] The accompanying drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification, and are used together with embodiments of the present utility model to explain the present utility model, and do not constitute a limitation on the present utility model. In the drawings:

[0022] Figure 1 It is a chamber body plan view of the present scheme;

[0023] Figure 2 It is an I-I sectional view of the present scheme;

[0024] Figure 3 It is a chamber body 1-1 sectional view of the present scheme;

[0025] Figure 4 It is a chamber body 2-2 sectional view of the present scheme;

[0026] Figure 5 It is a 2-2 sectional I-shaped steel frame view of the present scheme.

[0027] Wherein, 1, chamber body, 11, rectangular niche, 12, water ditch, 2, outer supporting layer, 21, steel frame, 211, steel mesh, 22, anchor rod, 23, anchor cable, 24, concrete, 25, I-steel frame, 26, steel backing plate, 27, I-steel bottom beam, 28, pull rod, 3, inner supporting layer, 4, transportation crossheading, 5, transportation roadway, 6, belt conveyor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] Please refer to Figures 1-5 , the coal mine underground machine head chamber supporting structure, including chamber body 1, chamber body 1 is located in the recovery working face transportation crossheading 4 end, for connecting transportation crossheading 4 and transportation roadway 5, the machine head part of the belt conveyor 6 arranged in transportation crossheading 4 is located in chamber body 1;

[0030] The chamber body 1 top direction and lateral direction are formed by the double-layer supporting structure arranged between the roadway inner wall, which are the outer supporting layer 2 directly connected with the roadway wall and the inner supporting layer 3 located at the side of the outer supporting layer 2, and the double-layer supporting improves the stability of the overall support of the chamber.

[0031] Please refer to Figures 3-5 , the coal mine underground machine head chamber supporting structure, the longitudinal section of the chamber body 1 has two forms, which are semicircular arch section or have an expanded roadway part on one side of the semicircular arch section, the expanded roadway part forms a rectangular niche 11 for placing control box, hydraulic station, energy storage station, hydraulic pump station and other equipment, so as to avoid the above-mentioned equipment directly installed in the main channel in the chamber body 1 to affect the passing; and the longitudinal section of the chamber body 1 needs to ensure that the maintenance space between the machine head of the belt conveyor 6 and the support, pipeline and facilities of the inner wall of the chamber body 1 is not less than 700mm.

[0032] Please refer to Figures 2-5, coal mine underground machine head chamber supporting structure, the outer supporting layer 2 is composed of the steel frame 21 consistent with the chamber body 1 contour and the anchor rod 22 and anchor cable 23 connected at one end on the steel frame 21 and anchored in the coal and rock strata in the roadway, the steel frame 21 is formed by welding the reinforced ladder beam and the reinforced mesh 211 laid on the reinforced ladder beam, the anchor rod 22 and anchor cable 23 are fixed by the concrete 24 filled and sprayed between the steel frame 21 and the roadway wall, the anchor rod 22, anchor cable 23, reinforced ladder beam and reinforced mesh 211 are wrapped into an integral whole by the concrete 24, wherein the anchor rod 22 is a high-strength threaded steel anchor rod 22, the anchor cable 23 is a mine steel wire anchor cable 23, and the reinforced mesh 211 is formed by welding round steel;

[0033] The outer supporting layer 2 further comprises a plurality of groups of I-shaped steel frames 25 arranged along the length direction of the chamber body 1 and consistent with the longitudinal contour of the chamber body 1 and located inside the steel frame 21, the spacing between adjacent two groups of I-shaped steel frames 25 is 700 mm, and a pull rod 28 is used to connect between adjacent two groups of I-shaped steel frames 25;

[0034] The I-shaped steel frame 25 is in close contact with the concrete 24, and the gap is tightly wedged by the concrete 24 block, the I-shaped steel frame 25 is composed of a plurality of mutually adapted profile splicing units formed by welding I-shaped steel and connecting steel plates and spliced in sequence, the weld at the joint shall be strictly in accordance with the relevant requirements of steel structure, and the profile splicing units are connected by bolts;

[0035] A steel backing plate 26 is welded at the bottom of each end of each group of I-shaped steel frames 25, a I-shaped steel bottom beam 27 is used for roadway bottom paving, the I-shaped steel frame 25 is welded integrally with the corresponding I-shaped steel bottom beam 27 at the bottom side through the steel backing plate 26 at the bottom side, the adjacent I-shaped steel bottom beams 27 in front and back and left and right are connected by bolts, and the left and right I-shaped steel bottom beams 27 are staggered and paved to form the floor of the chamber body 1;

[0036] The floor elevation in the chamber body 1 is consistent with the floor elevation of the transportation roadway 5, and a water ditch 12 is formed on the floor, and the water flow gradient is 3 ‰.

[0037] Please refer to Figure 3 , coal mine underground machine head chamber supporting structure, the inner supporting layer 3 is a reinforced concrete with embedded steel, which cooperates with the outer supporting layer 2 to form a combined support.

[0038] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A coal mine head chamber support structure, comprising a chamber body (1), characterized in that: The top and side of the chamber body (1) are composed of a double-layer support structure arranged between the inner wall of the tunnel, which respectively includes an outer support layer (2) directly connected to the tunnel wall and an inner support layer (3) located on the side of the outer support layer (2).

2. The coal mine head chamber support structure according to claim 1, characterized in that: The outer supporting layer (2) is composed of a steel frame (21) having the same outer contour as the chamber body (1), and an anchor rod (22) and an anchor cable (23) connected to the steel frame (21) at one end and anchored in the coal and rock layer in the tunnel at the other end; The anchor rod (22) and the anchor cable (23) are fixed by concrete (24) sprayed between the steel frame and the tunnel wall.

3. The coal mine head chamber support structure according to claim 2, characterized in that: The steel frame (21) is formed by welding a steel ladder beam and a steel mesh (211) laid on the steel ladder beam.

4. The coal mine head chamber support structure according to claim 2, characterized in that: The outer supporting layer (2) also includes a plurality of I-shaped steel frames (25) arranged along the length direction of the chamber body (1) and located on the inner side of the steel frame (21), which are consistent with the longitudinal outer contour of the chamber body (1). The outer sides of the I-shaped steel frames (25) are in close contact with the concrete (24).

5. The coal mine head chamber support structure according to claim 4, characterized in that: The I-beam frame (25) is composed of a plurality of mutually adapted contour splicing units welded together by I-beams and connecting steel plates, which are spliced ​​in sequence and connected by bolts.

6. The coal mine head chamber support structure according to claim 4, characterized in that: Two adjacent groups of I-shaped steel frames (25) are connected by a pull rod (28).

7. The coal mine head chamber support structure according to claim 1, characterized in that: The inner supporting layer (3) is concrete with embedded steel bars.

8. The coal mine head chamber support structure according to claim 4, characterized in that: A steel plate (26) is welded to the bottom of each end of each group of I-steel frames (25), and the tunnel bottom is paved with an I-steel bottom beam (27). The I-steel frames (25) are welded to the corresponding I-steel bottom beam (27) on the bottom side through the steel plate (26) on the bottom side.

9. The coal mine head chamber support structure according to claim 1, characterized in that: The longitudinal section of the chamber body (1) has two forms, namely a semicircular arch section or a semicircular arch section with an expanded tunnel portion on one side, the expanded tunnel portion forming a rectangular niche (11).

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