A construction method for air inlet and return structure of coal mining working face

Abstract

The present invention discloses a method for constructing an air intake and return structure for a coal mining face. The method comprises: constructing a first ascending tunnel at the boundary of the mining area before arranging the mining face; constructing a transport tunnel and a centralized return air tunnel at both ends of the first ascending tunnel, wherein one end of the transport tunnel is connected to one end of the first ascending tunnel, and the other end of the transport tunnel is connected to the coal loading group transport ascending tunnel; one end of the centralized return air tunnel is connected to the first ascending tunnel, and the other end of the centralized return air tunnel is connected to the coal loading group return air ascending tunnel. This method solves the problems of the prior art in that the mining face takes a long time to form during excavation, which easily leads to roadway disrepair in long working faces or areas with high mine pressure, and the long fresh air flow path during mining, resulting in high levels of toxic gases and dust in the return air tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of mining, and in particular to a construction method of an air inlet and return structure for a coal mining working face. Background Art

[0002] The design of the traditional underground coal mine roadway is based on Figure 2 During the mining face recovery, a return air lane 1' is connected to the mine's dedicated return air system, a transport lane 2' is connected to the mine's main air intake system, and the cut eye 3' is connected to the transport lane 2' and the return air lane 1' to form a mining face. Then different mining processes are used to recover coal resources. The toxic and harmful gases in the mining face are then discharged to the professional return air system through the return air lane and finally discharged to the ground. The path of fresh air circulation in this structure is the total length of the transport lane, cut eye and return air lane. The farther the location is from the air intake system, the more toxic gases and dust generating areas it passes through, and the more toxic gases and dust are in the air, which greatly harms the health of the workers in the return air lane. Reference Figure 1 During the excavation period, due to the limitations of the traditional development and extension system, only two excavation heads 4' can be opened during the mining face formation process, one of which is opened on the return air tunnel 1' and the other excavation head is opened on the transport tunnel 2'. If a relatively long working face or an area with high mine pressure is encountered, when the construction of the front tunnel is not in place, the rear tunnel may have been seriously dilapidated. Summary of the Invention

[0003] In order to solve the above shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a construction method for an air inlet and return structure of a coal mining working face.

[0004] The technical solution of the present invention is: a method for constructing an air inlet and return structure of a coal mining working face, the method comprising:

[0005] Before arranging the mining face, the construction first goes up the mountain at the boundary of the mining area;

[0006] Construct a transport tunnel and a centralized return air tunnel at both ends of the first uphill section. One end of the transport tunnel is connected to one end of the first uphill section, and the other end of the transport tunnel is connected to the transport uphill section of the coal-loading group. One end of the centralized return air tunnel is connected to the first uphill section, and the other end of the centralized return air tunnel is connected to the return air uphill section of the coal-loading group.

[0007] During the excavation, the transport tunnel and return air tunnel were constructed simultaneously, and the return air tunnel was excavated using forward and reverse excavation;

[0008] When the transport tunnel is excavated, the transport system of the transport tunnel enters the coal loading group through the first transport stone gate to transport the coal uphill, and the return air system of the transport tunnel enters the coal loading group through the third return air connecting tunnel to return the air uphill;

[0009] When the return air tunnel is being excavated, the transport system of the return air tunnel enters the coal loading group through the second transport stone gate to transport the coal uphill, and the return air system of the return air tunnel enters the coal loading group through the fourth return air connecting tunnel to return the air uphill;

[0010] When the return air tunnel is back-excavated, the transportation system of the return air tunnel enters the main transportation tunnel through the first uphill tunnel, and then enters the coal loading group for transportation uphill. The return air system of the return air tunnel enters the first uphill tunnel through the second return air connecting tunnel, and then enters the coal loading group return air uphill through the centralized return air tunnel and the first return air connecting tunnel.

[0011] Furthermore, it also includes:

[0012] Before arranging the mining working face, a second uphill section was constructed at the boundary of the mining area;

[0013] One end of the second uphill is connected to the centralized return air tunnel, and the other end of the second uphill is connected to the transportation tunnel.

[0014] The second uphill section is connected to the connection between the return air tunnel and the cut eye through the fifth return air tunnel;

[0015] Among them, the second uphill is used to transport fresh air and transport gangue and coal, and the first uphill is used to transport polluted air.

[0016] The beneficial effects of the present invention are as follows: compared with the prior art, during the excavation of the working face, when arranging a relatively long return air tunnel and transport tunnel, the forward excavation and reverse excavation of the return air tunnel can be carried out simultaneously, thereby achieving the purpose of quickly forming a mining face, reducing the long-term idleness of the tunnel and avoiding the situation of secondary tunnel repair in the later stage;

[0017] After the mining face is formed, the return air system of the coal mining face is adjusted to ensure that the airflow in the mining face transport tunnel and the return air tunnel is fresh air, reducing the time and area of ​​workers' exposure to dust and toxic and harmful gases, and greatly reducing the risk of workers suffering from silicosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the background technology of the present invention during mining;

[0019] Figure 2 A schematic diagram of the background technology of the present invention during tunneling;

[0020] Figure 3 A schematic diagram of the present invention during excavation;

[0021] Figure 4 It is a schematic diagram of the mining period of the present invention. DETAILED DESCRIPTION

[0022] The invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] Implementation Example 1:

[0024] In order to solve the problems of long face formation time during excavation in the existing technology, long working faces or areas with high mine pressure are prone to cause roadway disrepair, long fresh air flow path during mining, resulting in toxic gases and dust in the return air lane, reference Figure 3 The present invention adopts a method for constructing an air inlet and return structure of a coal mining face, the method comprising: constructing a first uphill 6 at the boundary of the mining area before arranging the mining face; constructing a transport tunnel 8 and a centralized return air tunnel 7 at both ends of the first uphill 6, one end of the transport tunnel 8 is connected with one end of the first uphill 6, the other end of the transport tunnel 8 is connected with a transport uphill 11 of the coaling group, one end of the centralized return air tunnel 7 is connected with the first uphill 6, and the other end of the centralized return air tunnel 7 is connected with a return air uphill 12 of the coaling group; during excavation, the transport tunnel 2 and the return air tunnel 1 are constructed at the same time, and the excavation of the return air tunnel 1 adopts forward excavation and reverse excavation; when the transport tunnel 2 is excavated, the transport system of the transport tunnel 2 passes through the first transport stone Door 10 enters the coal loading group for transportation up the mountain 11, and the return air system of the transport tunnel 2 enters the coal loading group return air up the mountain 12 through the third return air connecting tunnel 17; when the return air tunnel 1 is being excavated, the transportation system of the return air tunnel 1 enters the coal loading group for transportation up the mountain 11 through the second transportation stone door 14, and the return air system of the return air tunnel 1 enters the coal loading group return air up the mountain 12 through the fourth return air connecting tunnel 16; when the return air tunnel 1 is being excavated in reverse, the transportation system of the return air tunnel 1 enters the transport tunnel 8 through the first uphill 6, and then enters the coal loading group for transportation up the mountain 11, and the return air system of the return air tunnel 1 enters the first uphill 6 through the second return air connecting tunnel 15, and then enters the coal loading group return air up the mountain 12 through the centralized return air tunnel 7 and the first return air connecting tunnel 13.

[0025] During the excavation of the working face, when arranging relatively long return air tunnels and transport tunnels, the forward and reverse excavation of the return air tunnel can be carried out simultaneously to achieve the purpose of quickly forming the mining face, reduce the long-term idleness of the tunnels, and avoid the situation of secondary tunnel repairs in the later stage;

[0026] After the mining face is formed, by adjusting the return air system of the coal mining face, the airflow in the mining face transport tunnel 2 and the return air tunnel 1 is made fresh, reducing the time and area of ​​workers' exposure to dust and toxic and harmful gases, and greatly reducing the risk of workers suffering from silicosis.

[0027] When this embodiment is used, the fresh air at the first heading head 4-2 is blown to the first heading head 4-2 through the second transport stone gate 14 and the gas pipeline in the fourth return air tunnel 16, and the air of the first heading head 4-2 is updated to become exhaust gas. The exhaust gas is then transported to the upper coal group return air uphill 12 through the fourth return air tunnel 16 and the second transport stone gate 14; the fresh air at the second heading head 4-3 is blown to the second heading head 4-3 through the first transport stone gate 10 and the gas pipeline in the third return air tunnel 17, and the air of the second heading head 4-3 is updated. The exhaust gas is then transported to the coal-loading group return air uphill 12 through the main transport tunnel 8, the first uphill 6 and the centralized return air tunnel 7; the fresh air at the third heading head 4-1 is transported to the first uphill 6 through the sixth return air tunnel 19 and the main transport tunnel 8, and then blown to the third heading head 4-1 through the gas pipeline in the second return air tunnel 15, updating the air of the third heading head 4-1 to become exhaust gas, and then the exhaust gas is transported to the coal-loading group return air uphill 12 through the second return air tunnel 15, the first uphill 6 and the centralized return air tunnel 7.

[0028] Implementation Example 2:

[0029] When multiple mining faces need to be built in the mining area, if there is only one first uphill, then after the exhaust gas mixes with the first uphill, the first uphill cannot be used to transport fresh air, making it unsuitable for multiple mining faces.

[0030] In order to solve this problem, the present embodiment further includes: before arranging the mining working face, a second uphill 5 is constructed at the boundary of the mining area; one end of the second uphill 5 is connected to the centralized return air tunnel 7, and the other end of the second uphill 5 is connected to the transport tunnel 8, and the second uphill 5 is connected to the connection between the return air tunnel 1 and the cutting eye 3 through the fifth return air connecting tunnel 18; wherein, the second uphill 5 is used to transport fresh air flow and transport gangue and coal mines, and the first uphill 6 is used to transport polluted air.

[0031] When in use, if there are multiple mining faces, each mining face can transport the exhaust gas generated by all mining faces through the first uphill, and transport fresh air and waste rock and coal through the second uphill 5. The exhaust gas generated between mining faces will not affect other mining faces, so this method can be used for multiple mining faces.

[0032] During the mining period, refer to Figure 4For the air in return airway 1, fresh air is delivered to return airway 1 through the second transport stone gate 14 and the gas pipeline in the fourth return air joint 16 to refresh the air in return airway 1. Exhaust gas is then delivered to the coal loading group return air uphill 12 through the second return air joint 15, the first uphill 6, and the centralized return airway 7. For the air in transport tunnel 2, fresh air is blown to transport tunnel 2 through the first transport stone gate 10 and the gas pipeline in the third return air joint 17 to refresh the air in transport tunnel 2. Exhaust gas is then delivered to the coal loading group return air uphill 12 through transport tunnel 2, the mining face, the fifth return air joint 18, the second uphill 5, and the centralized return airway 7. This significantly reduces the distance from the upper end of the mining face to the return airway opening, ensuring that the return airway 1 is exposed to fresh air, preventing workers from long-term exposure to toxic and harmful gases and large amounts of dust.

[0033] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A method for constructing an air inlet and return structure for a coal mining face, characterized in that: The method comprises: Before arranging the mining face, the first construction is carried out uphill at the boundary of the mining area (6); A transport tunnel (8) and a centralized return air tunnel (7) are constructed at both ends of the first uphill (6), one end of the transport tunnel (8) is connected to one end of the first uphill (6), the other end of the transport tunnel (8) is connected to the coaling group transport uphill (11), one end of the centralized return air tunnel (7) is connected to the first uphill (6), and the other end of the centralized return air tunnel (7) is connected to the coaling group return air uphill (12); During the excavation, the transport tunnel (2) and the return air tunnel (1) were constructed simultaneously. The return air tunnel (1) was excavated by forward and reverse excavation. When the transport tunnel (2) is excavated, the transport system of the transport tunnel (2) enters the coaling group for transport uphill (11) through the first transport stone gate (10), and the exhaust gas generated by the excavation of the transport tunnel (2) enters the coaling group for return air uphill (12) through the transport tunnel (8), the first uphill (6) and the centralized return air tunnel (7); When the return air tunnel (1) is being excavated, the transportation system of the return air tunnel (1) enters the coal loading group through the second transportation stone gate (14) and transports it uphill (11). The waste gas generated by the excavation of the return air tunnel (1) enters the coal loading group through the fourth return air connecting tunnel (16) and the second transportation stone gate (14) and enters the coal loading group return air uphill (12). When the return air lane (1) is reversed, the transportation system of the return air lane (1) enters the transportation lane (8) through the first uphill lane (6), and then enters the coal loading group transportation uphill lane (11). The exhaust gas generated by the reversed excavation of the return air lane (1) enters the coal loading group return air uphill lane (12) through the second return air connecting lane (15), the first uphill lane (6) and the centralized return air lane (7).

2. The method for constructing an air inlet and return structure for a coal mining face according to claim 1, characterized in that: Also includes: Before arranging the mining face, a second uphill section (5) was constructed at the boundary of the mining area; One end of the second uphill (5) is connected to the centralized return air lane (7), and the other end of the second uphill (5) is connected to the transport lane (8). The second uphill (5) is connected to the connection between the return air lane (1) and the cut eye (3) through the fifth return air lane (18); Among them, the second uphill (5) is used to transport fresh air flow and transport gangue and coal, and the first uphill (6) is used to transport polluted air.

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