Reinforced composite supporting structure for large-span pushing and mining area of stope face

Abstract

The utility model provides a reinforced composite supporting structure of a stope face pushing and mining large-span area, which belongs to the technical field of coal mine underground roadway supporting and comprises a main roadway and a bifurcated roadway which are arranged in a three-way door mode, and two groups of supporting trusses are arranged in the main roadway and the bifurcated roadway along the directions of the roadways of the main roadway and the bifurcated roadway. A wood crib is arranged at the intersection of the main roadway and the bifurcated roadway, a first trapezoidal shed unit is arranged at the position, communicated with the bifurcated roadway, in the main roadway, and a second trapezoidal shed unit is arranged at the position, communicated with the main roadway, in the bifurcated roadway. The combined supporting device has the advantages that safe mining of a crossheading roadway of a coal face in a large-span area such as a three-way door can be achieved through combination of multiple supporting modes, and a solid foundation is laid for successful reinforcement of combined supporting of the large-span area such as the three-way door pushed and mined by a stope face in the next step.

Description

Technical Field

[0001] The utility model belongs to the technical field of roadway support in coal mines, and specifically relates to a reinforced composite support structure for a large-span area during the extraction of a mining face. Background Art

[0002] A protective coal pillar refers to an unmined coal pillar reserved on both sides of a coal mine roadway, which is mainly used to support the roadway and separate the coal pillars to ensure the safety and stability of the mine. Moreover, during the coal mining process, in order to ensure the stability of the old mine area, the normal production connection, and the efficient recovery and utilization of resources, it is necessary to recover the reserved protective coal pillars.

[0003] However, since there are generally special structures such as old roadways constructed for production needs inside the protective coal pillar, and even the situation of overlapping roadways appears, it is easy to make the production conditions of the working face become complex, thus increasing the difficulty of roof control in the coal mining face. Therefore, it is necessary to strengthen the support of the roof in the old roadway area in advance, especially in the large-span area where structures such as turnout gates are formed in the roadway intersection area, to avoid roof accidents such as roof caving and collapse during coal mining production, and then ensure the normal extraction of the working face. Summary of the Utility Model

[0004] The purpose of the utility model is to propose and design a reinforced composite support structure for a large-span area during the extraction of a mining face in view of the problem that the roofs in large-span areas such as existing turnout gates are prone to roof accidents such as caving and collapse during coal mining production, so as to solve the above problems, ensure the safety and reliability of the support during the extraction of the turnout gate and other large-span areas in the mining face, thus ensuring the safety of the roof of the working face during extraction and realizing the safe and efficient extraction of the coal mining face.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is as follows: a reinforced composite support structure for a large-span area during the extraction of a mining face, which includes a main roadway and a bifurcated roadway arranged in a turnout gate shape. Two groups of support trusses are arranged along the roadway direction inside the main roadway and the bifurcated roadway respectively. A crib is installed at the intersection of the main roadway and the bifurcated roadway. A first trapezoidal shed unit is arranged at the part where the main roadway is connected to the bifurcated roadway, and a second trapezoidal shed unit is arranged at the part where the bifurcated roadway is connected to the main roadway. Based on this, the utility model not only adopts the trusses constructed with increased density to strengthen the active support for the roof, but also adopts the methods of setting trapezoidal sheds, support monomers, unit supports, cribs, and hydraulic supports to passively support the gateway roadway, so as to realize the safe mining of the gateway roadway in the coal mining face in large-span areas such as turnout gates through the clarification of the support method and the advanced support distance, laying a solid foundation for the success of the reinforced composite support for the large-span areas such as turnout gates in the next-step extraction of the mining face.

[0006] Further, a row of support monomers is arranged along the trend of its own roadway on one side of the bifurcated roadway close to the main roadway, and a row of support monomers is arranged along the trend of its own roadway on one side of the main roadway close to the bifurcated roadway. A unit support is arranged on one side of the main roadway close to the intersection of the main roadway and the bifurcated roadway, and the roof is reinforced and supported by the above-mentioned support monomers and unit supports during tunneling.

[0007] Further, at least two cribs are installed along the direction away from the bifurcation point at the intersection of the main roadway and the bifurcated roadway, and the roof at this location is passively supported by the cribs.

[0008] Further, the first trapezoidal shed unit includes seven trapezoidal sheds arranged along the trend of the main roadway, and the quantity can also be adjusted according to the actual situation of the roadway to passively support the roof at this location during tunneling.

[0009] Further, the second trapezoidal shed unit includes five trapezoidal sheds arranged along the trend of the bifurcated roadway, and the quantity can also be adjusted according to the actual situation of the roadway to passively support the roof at this location during tunneling.

[0010] Further, at least two cribs are arranged along the trend of its own roadway inside the bifurcated roadway to support the roof during coal pushing, and they can be successively withdrawn to the three-way intersection along with coal pushing during coal pushing.

[0011] Further, the main roadway is the return airway.

[0012] It can be seen from the above technical solutions that the utility model has the following advantages: To ensure the smooth coal pushing of the coal mining face through large-span areas such as three-way intersections and achieve the purpose of safe support and rapid coal winning, the utility model not only adopts the trusses with densified construction to strengthen the active support of the roof, but also adopts the methods of setting trapezoidal sheds, support monomers, unit supports, cribs, and hydraulic supports to passively support the gateway roadway. Thus, through the clarification of the support method and the advanced support distance, the safe mining of the gateway roadway of the coal mining face in large-span areas such as three-way intersections is realized, laying a solid foundation for the success of strengthening the combined support for the coal pushing of the next coal mining face through large-span areas such as three-way intersections. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a structural schematic diagram of the specific embodiment of the present utility model.

[0015] In the figure: 1. Branch roadway; 2. Wooden crib; 3. Single support unit; 4. Unit support; 5. Hydraulic support; 6. First trapezoidal shed unit; 7. Support truss; 8. Main roadway; 9. Second trapezoidal shed unit. Specific implementation manner

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figure 1 shown, the present invention provides a strengthened composite support structure for a large-span area in the extraction face during pushing mining, which includes a main roadway 8 and a branch roadway 1 arranged in a three-way gate. Among them, the main roadway 8 is a return airway, the branch roadway 1 is an old roadway, and two groups of support trusses 7 are arranged along the respective roadway directions inside the main roadway 8 and the branch roadway 1, and the interval distance between adjacent support trusses 7 is set to three meters. The distances between the support truss 7 and the walls of the main roadway 8 and the branch roadway 1 are set to 1.65 meters and 3.65 meters respectively to strengthen the support for the roof of the crossheading in this area.

[0018] Moreover, two wooden cribs 2 are installed at the intersection of the main roadway 8 and the branch roadway 1. A first trapezoidal shed unit 6 is arranged at the part where the main roadway 8 is connected to the branch roadway 1. The first trapezoidal shed unit 6 includes seven trapezoidal sheds arranged along the direction of the main roadway 8, and the quantity can also be adjusted according to the actual situation of the roadway to passively support the roof at this position during tunneling. A second trapezoidal shed unit 9 is arranged at the part where the branch roadway 1 is connected to the main roadway 8. The second trapezoidal shed unit 9 includes five trapezoidal sheds arranged along the direction of the branch roadway 1, and the quantity can also be adjusted according to the actual situation of the roadway to passively support the roof at this position during tunneling.

[0019] At the same time, during the extraction period, single-row support monomers 3 are erected at a spacing of 1 piece / m along the respective roadway directions on the side of the branch roadway 1 close to the main roadway 8 and on the side of the main roadway 8 close to the branch roadway 1 in this area, and unit supports 4 are erected at the three-way intersection for reinforcement support.

[0020] Considering the actual coal pushing situation of the working face, a hydraulic support 5 is installed in advance on the upper side of the main roadway 8 close to it to strengthen the support for the roof. When the coal pushing reaches 120 meters of the bifurcation roadway, 3 wooden chocks 2 are set up in the old roadway and are successively withdrawn to the three-way junction along with the coal pushing; in the main roadway 8, the distance between the unit supports 4 is shortened from the original 6 meters to 5 meters to maintain the roof in this area.

[0021] Based on this, the utility model not only adopts a truss with densified construction to actively strengthen the support for the roof, but also adopts the methods of setting up trapezoidal sheds, supporting single props 3, unit supports 4, wooden chocks 2, and hydraulic supports 5 to passively support the gateway roadway, so as to realize the safe mining of the gateway roadway of the coal mining face in large-span areas such as three-way junctions by clarifying the support method and the advanced support distance, laying a solid foundation for the success of strengthening the composite support for the large-span areas such as three-way junctions in the next coal mining face.

[0022] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0023] 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 the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reinforced composite support structure for a large-span area in the extraction face, including a main roadway (8) and a bifurcated roadway (1) arranged in a three-way intersection; characterized in that, Inside the main roadway (8) and inside the branch roadway (1), two groups of support trusses (7) are arranged along the roadway direction of their own. At the intersection of the main roadway (8) and the branch roadway (1), a crib (2) is installed. At the connection part between the inside of the main roadway (8) and the branch roadway (1), a trapezoidal shed unit one (6) is set. At the connection part between the inside of the branch roadway (1) and the main roadway (8), a trapezoidal shed unit two (9) is set.

2. The enhanced composite support structure for the large-span area in the coal winning face according to claim 1, wherein Inside the branch roadway (1), on the side close to the main roadway (8), a row of support monomers (3) is arranged along the roadway direction of its own. Inside the main roadway (8), on the side close to the branch roadway (1), a row of support monomers (3) is arranged along the roadway direction of its own. On the side of the inside of the main roadway (8) close to the intersection of the main roadway (8) and the branch roadway (1), a unit support (4) is set.

3. The enhanced composite support structure for the large-span area in the extraction face according to claim 1, characterized in that, At the intersection of the main roadway (8) and the branch roadway (1), at least two cribs (2) are installed along the direction away from the bifurcation point.

4. The reinforced composite support structure for the large-span area in the coal face advancing mining according to claim 1, wherein The trapezoidal shed unit one (6) includes seven trapezoidal sheds arranged along the direction of the main roadway (8).

5. The enhanced composite support structure for the large-span area in the coal face advancing mining according to claim 1, characterized in that, The trapezoidal shed unit two (9) includes five trapezoidal sheds arranged along the direction of the branch roadway (1).

6. The reinforced composite support structure for the large-span area in the extraction face according to claim 1, characterized in that Inside the branch roadway (1), at least two cribs (2) are arranged along the roadway direction of its own.

7. The reinforced composite support structure for the large-span area in the extraction face as claimed in claim 1, wherein The main roadway (8) is a return airway.

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