A standby negative pressure system for preventing gas overrun during roadway support

Abstract

This utility model belongs to the field of coal mine underground gas control technology. The purpose is to provide a backup negative pressure system for preventing gas exceedances during roadway support, capable of timely negative pressure suction when a large amount of gas gushes from the roadway support borehole. The technical solution adopted includes a main system, a transition system, and a drilling-while-drilling system. In the main system, one end of a first multi-port is connected to the end of the main pipeline near the working face. In the transition system, one or more first armored pipes have one end connected to the first multi-port, and the other end of each is connected to a second multi-port. In the drilling-while-drilling system, one or more second armored pipes have one end connected to the second multi-port via a second valve, and the other end of each is connected to a tee. A third valve is installed on the second armored pipe near the tee, and the other two outlets of the tee are aligned in a straight line and inserted into the borehole. This utility model is used for gas extraction during roadway excavation and support borehole drilling.

Description

Technical Field

[0001] This utility model relates to a backup negative pressure system for preventing gas exceedances during roadway support, belonging to the field of underground gas control technology in coal mines. Background Technology

[0002] During existing roadway support (rock bolt or cable) drilling, it is generally assumed that no gas will emerge; therefore, gas extraction systems are usually not installed during operations. However, in actual operation, some boreholes may experience gas leakage to varying degrees. This leakage is usually diluted to below safe levels by roadway airflow and generally does not disturb methane sensors. However, in rare cases, gas or a gas-water mixture may erupt from the borehole. If a backup extraction system is not installed at the borehole opening, the sudden large-scale gas leakage cannot be promptly contained and will escape into the roadway, potentially causing abnormal gas fluctuations or even exceeding gas limits, leading to a gas safety accident and posing a significant safety hazard.

[0003] Coal mine roadways are generally equipped with main pipelines for gas extraction, which are installed gradually as the roadways are excavated. However, due to factors such as unit equipment, transfer stations, belt conveyors, and personnel attendance, the main pipelines that have been put into operation (with negative pressure extraction) often lag behind the working face by about 100 meters. Therefore, it is necessary to design a system to extend the negative pressure extraction function of the main pipeline to the support borehole at the working face. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a backup negative pressure system for preventing gas exceedance during roadway support, which can promptly perform negative pressure suction when a large amount of gas is ejected from the roadway support borehole.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a backup negative pressure system for preventing gas exceedance during roadway support, comprising a main system, a transition system and a drilling system. The main system comprises a main pipeline and a first multi-port. One end of the first multi-port is connected to the end of the main pipeline near the working face, and a plug is installed at the other end. A first valve is installed on each of the remaining outlets. The transition system includes a first armored tube and a second multi-port, with one or more first armored tubes having one end connected to the first multi-port and the other end of each tube connected to a second multi-port. The drilling system includes a second armored pipe and a tee. One or more second armored pipes are connected at one end to a second multi-way pipe via a second valve, and each end is connected to a tee. A third valve is installed on the second armored pipe near the tee. The other two outlets of the tee are in a straight line and inserted into the borehole. One end of a small chain is connected to the tee, and the other end is connected to the roadway roof.

[0006] Preferably, the first multi-port is a six-port.

[0007] Preferably, a plurality of fourth valves are provided at intervals along the main pipeline.

[0008] Preferably, a plurality of fifth valves are provided at the end and at intervals in the middle of the first armored tube.

[0009] Preferably, the first valve, the fourth valve, and the fifth valve are all butterfly valves, and the second valve and the third valve are all ball valves.

[0010] Preferably, the main pipeline is suspended below the tunnel roof by steel wire rope.

[0011] Preferably, the first armored tube is a 4-inch armored tube, and the second armored tube is a 2-inch armored tube.

[0012] Compared with the prior art, the present invention has the following beneficial effects.

[0013] 1. This utility model uses a three-stage negative pressure system consisting of a main system, a transition system, and a drilling system to introduce extraction negative pressure to the borehole opening of the support borehole, thereby achieving the purpose of gas extraction as needed while the support borehole is being drilled.

[0014] 2. This utility model can also provide timely extraction negative pressure for cut boreholes during tunnel excavation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0018] In the diagram: 1 is the main system, 2 is the transition system, 3 is the drilling system, 4 is the borehole, 5 is the roadway roof, 6 is the wire rope, and 7 is the drilling rig. 11 is the main pipeline, 12 is the first multi-way, 13 is the plug, 14 is the first valve, and 15 is the fourth valve; 21 is the first armored pipe, 22 is the second multi-way valve, 23 is the second valve, and 24 is the fifth valve; 31 is the second armored pipe, 32 is a tee, 33 is a small chain, and 34 is the third valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model, provided that it does not affect the effects and purposes that this utility model can produce. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0021] The present invention provides the following embodiments.

[0022] like Figure 1 As shown, this utility model provides a backup negative pressure system for preventing gas exceedances during roadway support, comprising a main system 1, a transition system 2, and a drilling system 3. The main system 1 includes a main pipeline 11 and a first multi-port 12. One end of the first multi-port 12 is connected to the end of the main pipeline 11 near the working face, and a plug 13 is installed at the other end. First valves 14 are installed on the remaining outlets. The transition system 2 includes a first armored tube 21 and a second multi-port 22. One or more first armored tubes 21 are connected at one end to the first multi-port 12, and the other end is connected to a second multi-port 22.

[0023] like Figure 2 As shown, the drilling system 3 includes a second armored pipe 31 and a tee 32. One or more second armored pipes 31 are connected at one end to a second multi-way 22 via a second valve 23, and each end is connected to a tee 32. A third valve 34 is installed on the second armored pipe 31 near the tee 32. The other two outlets of the tee 32 are in a straight line and inserted into the borehole 4. One end of the small chain 33 is connected to the tee 32, and the other end is connected to the roadway roof 5.

[0024] The first multi-port 12 is a six-way valve. The second multi-port 22 can be a four-way valve, or a five-way or six-way valve with more negative pressure outlets. The negative pressure outlet of the second multi-port 22 can be connected to the second valve 23, or to a pipe plug. When connecting the second armored pipe 31, the pipe plug can be removed.

[0025] Multiple fourth valves 15 are spaced apart on the main pipeline 11.

[0026] Multiple fifth valves 24 are provided at the end and at intervals in the middle of the first armored tube 21.

[0027] The first valve 14, the fourth valve 15 and the fifth valve 24 are all butterfly valves, and the second valve 23 and the third valve 34 are all ball valves.

[0028] The main road 11 is suspended below the tunnel roof 5 by steel wire rope 6.

[0029] The first armored tube 21 is a 4-inch armored tube, and the second armored tube 31 is a 2-inch armored tube.

[0030] In this utility model, the main system 1 provides sufficient extraction negative pressure for the entire roadway during tunnel excavation, the transition system 2 provides sufficient extraction negative pressure for the area between the end of the main system 1 and the face of the tunnel, and the drilling system 3 provides extraction negative pressure for the support borehole construction and the cutting borehole during roadway excavation.

[0031] The main pipeline 11 is constructed from individual, tightly connected φ355mm stainless steel pipes. It is suspended by φ8mm steel wire ropes 6 according to the "one pipe, two supports" principle, at a distance no greater than 500mm from the tunnel roof 5 and no greater than 300mm from the tunnel wall. The distal end connects to the mine panel extraction system. In principle, a φ355mm six-way valve is installed every 50 meters, and a fourth valve 15 (DN350 butterfly valve) is added every 200 meters to provide a negative pressure source for the transition system 2. The main pipeline 11 is installed systematically as the working face is excavated, and put into operation at fixed intervals, ensuring that the end of the operational pipeline is always no more than 100 meters from the working face.

[0032] Then, a first armored pipe 21 of a certain length (generally 20 meters) is led out from the first multi-port 12 at the end of the main pipeline 11 as a transition system 2 for extension. When the length of the first armored pipe 21 exceeds the distance between the end of the main pipeline 11 and the working face, it is placed in a disc shape on the roadway side and gradually stretched as the roadway is excavated. When it reaches the limit, it is continued to be connected, and a butterfly valve is installed at the end to ensure that the end is always within 5 meters of the permanent support of the working face. A second multi-port 22 is installed at the end of the first armored pipe 21 as the negative pressure source of the drilling system 3.

[0033] The drilling system 3 uses a second armored pipe 31 as a negative pressure pipeline. The end of the pipe is installed at the borehole 4 via a tee 32. A third valve 34 is installed on the second armored pipe 31 at a distance of 300mm from the borehole. The tee 32 is connected to the roadway roof 5 via a small chain 33 to prevent it from falling. The diameter of the end of the tee 32 inserted into the borehole 4 matches the diameter of the borehole 4.

[0034] When the first multi-port 12 is put into operation again in the main system 1, the original first armored pipe 21 is no longer connected. A new first armored pipe 21 and a new drilling system 3 are then connected from the newly put into operation first multi-port 12 in the main system 1, and the connection is continued in a cyclical manner as the roadway moves forward.

[0035] When an abnormal gas outburst occurs during drilling, the third valve 34 is opened for extraction to ensure that the gas level does not exceed the limit and to avoid gas safety accidents. The drill rod of the drilling rig 7 enters the hole through the tee 32 and drilling can continue, thus achieving the purpose of extracting gas as needed while drilling.

[0036] When a borehole is cut during tunnel excavation and gas is released, the second armored pipe 31 can be inserted into the cut borehole for negative pressure extraction.

[0037] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A standby negative pressure system for preventing gas overrunning during roadway support, characterized in that: It includes a main system (1), a transition system (2) and a drilling system (3). The main system (1) includes a main pipeline (11) and a first multi-port (12). One end of the first multi-port (12) is connected to the end of the main pipeline (11) near the working face, and the other end is equipped with a plug (13). The remaining outlets are all equipped with first valves (14). The transition system (2) includes a first armored tube (21) and a second multi-port (22). One end of one or more first armored tubes (21) is connected to the first multi-port (12), and the other end is connected to a second multi-port (22). The drilling system (3) includes a second armored pipe (31) and a tee (32). One or more second armored pipes (31) are connected at one end to a second multi-way (22) via a second valve (23), and at the other end to a tee (32). A third valve (34) is installed on the second armored pipe (31) near the tee (32). The other two outlets of the tee (32) are in a straight line and inserted into the borehole (4). One end of the small chain (33) is connected to the tee (32), and the other end is connected to the roadway roof (5).

2. A standby negative pressure system for preventing gas overrun during roadway support according to claim 1, characterized in that: The first multi-channel (12) is a six-channel.

3. The backup negative pressure system for preventing gas over-limit during roadway support according to claim 2, characterized in that: Multiple fourth valves (15) are spaced apart on the main pipeline (11).

4. A standby negative pressure system for preventing gas overrun during roadway support according to claim 3, characterized in that: Multiple fifth valves (24) are provided at the end and at intervals in the middle of the first armored tube (21).

5. A back-up negative pressure system for preventing gas overruns during roadway support according to claim 4, characterized in that: The first valve (14), the fourth valve (15) and the fifth valve (24) are all butterfly valves, and the second valve (23) and the third valve (34) are all ball valves.

6. A standby negative pressure system for preventing gas overrun during roadway support according to any one of claims 1-5, characterized in that: The main road (11) is suspended below the tunnel roof (5) by steel wire rope (6).

7. A standby negative pressure system for preventing gas overrun during roadway support according to any one of claims 1-5, characterized in that: The first armored tube (21) is a 4-inch armored tube, and the second armored tube (31) is a 2-inch armored tube.

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