A method for sealing and buried pipe extraction of gas at an outlet of a Y-type ventilation working face cut eye

Abstract

The application discloses a kind of Y type ventilation working face cut eye upper outlet sealing and buried pipe gas extraction method, comprising the following steps: before mining coal mining face, wood pile is erected in the position of 15m of coal wall in the non-mining side of cut eye upper outlet before mining coal mining face;Before mining coal mining face, slotting is carried out in the slotting position of coal wall in the non-mining side of cut eye upper outlet, the slotting height is the height of roadway, and the slotting width is not less than 3m;Before mining coal mining face, in the slotting position of coal wall in the non-mining side of cut eye upper outlet and sack sealing position, lay filled coal gangue sack, when sack is laid to 2m height.The application adopts the slotting mode of coal wall in the non-mining side of cut eye upper outlet, makes the arc section of cut eye upper outlet and sealing contact firm, on the basis of ordinary sack gangue pile sealing, adopts multiple guniting measures, blocks the air leakage channel of sealing and coal wall contact position and sealing and roof contact position, erects wood pile in the inside of cut eye upper outlet sealing, and lays large-diameter extraction pipeline in advance, efficiently extracts goaf gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas extraction in coal mine, and particularly relates to a Y-shaped ventilation working face cut eye upper outlet sealing and buried pipe gas extraction method. BACKGROUND

[0002] The non-mining side of the Y-shaped ventilation coal mining working face cut eye upper outlet is arc-shaped, and ordinary burlap gangue sealing often has air leakage channels, especially at the sealing position in contact with the coal wall and the sealing position in contact with the roof. With the advancing of the working face, the position is at the lowest point of the working face air pressure, and a large amount of gas in the goaf will eventually enter the roadway space through the air leakage channel of the region, which has a great safety risk, and special sealing methods and gas extraction methods need to be taken at the position to ensure safe and efficient mining. SUMMARY

[0003] Based on the technical problems existing in the background technology, the present application provides a Y-shaped ventilation working face cut eye upper outlet sealing and buried pipe gas extraction method.

[0004] The Y-shaped ventilation working face cut eye upper outlet sealing and buried pipe gas extraction method provided by the present application comprises the following steps:

[0005] S1: before mining in the coal mining working face, a wood pile is erected at a position 15 m away from the coal wall on the non-mining side of the cut eye upper outlet;

[0006] S2: before mining in the coal mining working face, a slot is dug at the position of the coal wall on the non-mining side of the cut eye upper outlet, the height of the slot is the height of the roadway, and the width of the slot is not less than 3 m;

[0007] S3: before mining in the coal mining working face, a burlap filled with coal gangue is laid at the position of the slot of the coal wall on the non-mining side of the cut eye upper outlet and the position of the burlap sealing, when the burlap is laid to a height of 2 m, a gas extraction pipe is placed on the burlap, one end of the gas extraction pipe is 0.3 m outside the burlap, and the other end is placed on the wood pile;

[0008] S4: when the burlap is laid to the top of the working face air return roadway, the burlap sealing on the side of the working face air return roadway is sprayed multiple times, and the spraying thickness is more than 100 mm;

[0009] S5: when mining in the coal mining working face, a large amount of gas is transported to the position of the coal wall on the non-mining side of the cut eye upper outlet, and the gas extraction pipe is used for extraction.

[0010] The present application has the following beneficial effects:

[0011] In the application, the slotting method is adopted on the non-mining side of the coal wall of the upper outlet of the cut, the arc section of the upper outlet of the cut is in close contact with the seal, on the basis of the seal of the ordinary bagged gangue, the leakage passage at the contact position of the seal and the coal wall and the contact position of the seal and the roof is blocked by adopting the multiple shotcreting measures, the wood pile is erected on the inner side of the seal of the upper outlet of the cut, the large-diameter extraction pipeline is buried in advance, and the gas in the goaf is extracted efficiently. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 A Y-type ventilation working face layout diagram of a Y-type ventilation working face cut upper outlet seal and pipe buried gas extraction method is provided in the application;

[0013] Fig. 2 A component installation position structure schematic diagram of the Y-type ventilation working face cut upper outlet seal and pipe buried gas extraction method is provided in the application.

[0014] In the drawing, 1 is the non-mining side of the coal wall of the upper outlet of the cut, 2 is the working face return air roadway, 3 is the hydraulic support, 4 is the bag seal position, 5 is the slotting position of the non-mining side of the coal wall of the upper outlet of the cut, 6 is the wood pile, and 7 is the gas extraction pipe. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0016] Embodiment 1, refer to Figs. 1-2 A Y-type ventilation working face cut upper outlet seal and pipe buried gas extraction method, comprising the following steps:

[0017] S1: before the mining of the coal mining face, a wood pile 6 is erected at the position 15 m away from the non-mining side of the coal wall of the upper outlet of the cut;

[0018] S2: before the mining of the coal mining face, slotting is performed at the slotting position 5 of the non-mining side of the coal wall of the upper outlet of the cut, the slotting height is the height of the roadway, and the slotting width is not less than 3 m;

[0019] S3: before the mining of the coal mining face, the bagged coal gangue is laid at the slotting position 5 of the non-mining side of the coal wall of the upper outlet of the cut and the bag seal position, when the bag is laid to a height of 2 m, the gas extraction pipe 7 is placed on the bag, one end of the gas extraction pipe 7 is 0.3 m outside the bag, and the other end is placed on the wood pile 6;

[0020] S4: when the bag is laid to the top of the working face return air roadway 2, multiple shotcreting is performed on the bag seal on the side of the working face return air roadway 2, and the shotcreting thickness is more than 100 mm;

[0021] S5: When the coal mining face is mined, a large amount of gas is transported to the position of the non-mining side coal wall 1 of the open-off cut upper outlet, and is extracted by the gas extraction pipe 7.

[0022] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacements or changes within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for sealing the outlet of a Y-shaped ventilation working face and extracting gas via buried pipe, characterized in that, Includes the following steps: S1: Before the coal face is mined, a wooden stack (6) is erected at a position 5m above the exit of the non-mining side coal wall (1); S2: Before the coal mining face is mined, a slot is cut at the non-mining side coal wall slotting position (5) at the upper exit of the cut. The slotting height is the roadway height and the slotting width is not less than 3m. S3: Before the coal mining face is mined, burlap sacks filled with coal gangue are laid at the slotting position (5) of the non-mining side coal wall at the upper exit of the cut and at the burlap sack sealing position. When the burlap sacks are laid to a height of 2m, the gas extraction pipe (7) is placed on the burlap sacks. One end of the gas extraction pipe (7) is 0.3m outside the burlap sacks, and the other end is placed on the wooden stack (6). S4: When the burlap sacks are laid to the top of the return airway (2) of the working face, the burlap sacks on the side of the return airway (2) of the working face are sealed with grout multiple times, and the grout thickness is more than 100mm. S5: During the mining of the coal face, a large amount of gas is transported to the non-mining side coal wall (1) at the upper outlet of the cut, and is extracted using the gas extraction pipe (7).

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