阅读说明：本技术 一种y型通风工作面采空区顶管瓦斯抽采方法 (Y-shaped ventilation working face goaf pipe jacking gas extraction method ) 是由 年军 蔡猛 吕晓波 邓春生 于 2021-09-27 设计创作，主要内容包括：本发明属于采空区瓦斯抽采技术领域,具体是一种Y型通风工作面采空区顶管瓦斯抽采方法。包括以下步骤。S100～在补巷靠近采空区一侧,利用伸缩千斤顶,斜向上顶入一根顶管,顶管前端均匀布置有筛眼；直至整根顶管完全顶入,在顶管的过程中,避开较大块的岩石。S200～顶管顶进完成后,准备一根抽放管,将抽放管迅速插入顶管内并固定好抽放管防止晃动影响封孔质量。S300～封孔5分钟后,聚氨酯溶液开始发泡膨胀,发泡会通过顶管上的筛眼渗入到采空区内封堵缝隙,20分钟后停止发泡,逐渐硬化固结。S400～聚氨酯封孔1小时后,与抽采管路连接进行瓦斯抽采,抽采管路上设置观测孔与阀门,用于取样气体,随时检测自燃发火标志性气体。(The invention belongs to the technical field of goaf gas extraction, and particularly relates to a method for extracting pipe-jacking gas in a goaf of a Y-shaped ventilation working face. Comprises the following steps. S100, pushing a jacking pipe obliquely upwards by using a telescopic jack at one side of the roadway patching close to the goaf, wherein the front end of the jacking pipe is uniformly provided with a sieve mesh; and (4) until the whole jacking pipe is completely jacked, avoiding larger rocks in the process of jacking the pipe. S200, after jacking of the jacking pipe is completed, preparing a drawing and releasing pipe, rapidly inserting the drawing and releasing pipe into the jacking pipe, and fixing the drawing and releasing pipe to prevent the drawing and releasing pipe from shaking to influence the hole sealing quality. And (5) after S300-hole sealing, the polyurethane solution starts to foam and expand, the foam can penetrate into the goaf through the meshes on the jacking pipe to seal gaps, and the foaming is stopped after 20 minutes, and the polyurethane solution is gradually hardened and solidified. And S400, sealing the hole with polyurethane for 1 hour, connecting the hole with an extraction pipeline to extract gas, and arranging an observation hole and a valve on the extraction pipeline for sampling gas and detecting spontaneous combustion ignition marked gas at any time.)

1. A method for extracting gas from a Y-shaped ventilation working face goaf jacking pipe comprises the following steps,

s100, pushing a jacking pipe (1) upwards in an inclined manner by using a telescopic jack on one side of a roadway repairing close to a goaf, wherein the front end of the jacking pipe (1) is uniformly provided with a sieve mesh (2); until the whole jacking pipe (1) is completely jacked, avoiding larger rocks in the process of jacking the pipe;

s200, after jacking of the jacking pipe is completed, preparing a drawing and releasing pipe (7), installing a baffle (4) at 0.3m and 1.5m of the front end of the drawing and releasing pipe (7) respectively, preparing a polyurethane solution for hole sealing in advance, fully pouring the solution on a towel, winding towel cloth on the drawing and releasing pipe while pouring the solution, ensuring that the drawing and releasing pipe between the baffles at two ends of the drawing and releasing pipe (7) is uniformly wound, and after winding is completed, rapidly inserting the drawing and releasing pipe (7) into the jacking pipe (1) and fixing the drawing and releasing pipe to prevent the drawing and releasing pipe from shaking to influence hole sealing quality;

s300-hole sealing is carried out for 5 minutes, the polyurethane (5) solution starts to foam and expand, the foam can penetrate into the goaf through the meshes (2) on the jacking pipe (1) to seal gaps, the foaming is stopped after 20 minutes, and the curing is gradually carried out;

and S400, sealing the hole with polyurethane for 1 hour, connecting the hole with an extraction pipeline to extract gas, wherein the extraction pipeline is provided with an observation hole and a valve (6) for sampling gas and detecting spontaneous combustion ignition marked gas at any time.

2. The Y-shaped ventilation working face goaf pipe-jacking gas extraction method according to claim 1, characterized by comprising the following steps: the front end of the top pipe (1) is conical, and sieve meshes are uniformly arranged within 1.5m of the front end of the top pipe (1); the rear end of the jacking pipe (1) is fixedly connected with the telescopic jack (3).

3. The Y-shaped ventilation working face goaf pipe-jacking gas extraction method according to claim 1, characterized by comprising the following steps: the inner diameter of the drainage pipe (7) is 110mm, and the length is 2 m.

4. The Y-shaped ventilation working face goaf pipe-jacking gas extraction method according to claim 1, characterized by comprising the following steps: a group of jacking pipes (1) are arranged every 10-20 m, and the angle is 30 degrees in the oblique direction.

Technical Field

The invention belongs to the technical field of goaf gas extraction, and particularly relates to a method for extracting pipe-jacking gas in a goaf of a Y-shaped ventilation working face.

Background

When the coal face adopts a Y-shaped ventilation mode, gas in the goaf easily escapes to a roadway repair to cause the concentration of the roadway repair gas to exceed the limit, and the gas is generally extracted from an inserted pipe in the goaf in a gas control mode aiming at the problem of the concentration of the roadway repair gas exceeding the limit. However, as the working face support moves backwards, the goaf falls, the waste rock is accumulated in the caving zone, the pipe insertion construction is difficult, and the extraction efficiency is low. Aiming at the current situation of roadway gas treatment on one side of a goaf, a pipe-jacking gas extraction method for improving extraction efficiency is urgently needed.

Disclosure of Invention

The invention aims to solve the problems and provides a method for extracting pipe-jacking gas in a goaf of a Y-shaped ventilation working face.

The invention adopts the following technical scheme: a method for extracting gas from a Y-shaped ventilation working face goaf jacking pipe comprises the following steps.

S100, pushing a jacking pipe obliquely upwards by using a telescopic jack at one side of the roadway patching close to the goaf, wherein the front end of the jacking pipe is uniformly provided with a sieve mesh; and (4) until the whole jacking pipe is completely jacked, avoiding larger rocks in the process of jacking the pipe.

S200, after jacking of the jacking pipe is completed, preparing a drawing and releasing pipe, installing a baffle plate at the position of 0.3m and 1.5m at the front end of the drawing and releasing pipe respectively, preparing a polyurethane solution for hole sealing in advance, fully pouring the solution onto a towel, winding the solution onto the drawing and releasing pipe while pouring the solution by the towel, ensuring that the drawing and releasing pipe between the baffles at the two ends of the drawing and releasing pipe is uniformly wound, and after winding is completed, rapidly inserting the drawing and releasing pipe into the jacking pipe and fixing the drawing and releasing pipe to prevent the drawing and releasing pipe from shaking to influence hole sealing quality.

And (5) after S300-hole sealing, the polyurethane solution starts to foam and expand, the foam can penetrate into the goaf through the meshes on the jacking pipe to seal gaps, and the foaming is stopped after 20 minutes, and the polyurethane solution is gradually hardened and solidified.

And S400, sealing the hole with polyurethane for 1 hour, connecting the hole with an extraction pipeline to extract gas, and arranging an observation hole and a valve on the extraction pipeline for sampling gas and detecting spontaneous combustion ignition marked gas at any time.

Furthermore, the front end of the jacking pipe is conical, and sieve meshes are uniformly arranged within 1.5m of the front end of the jacking pipe; the rear end of the jacking pipe is fixedly connected with the telescopic jack.

Further, the inner diameter of the suction pipe is 110mm, and the length of the suction pipe is 2 m.

Furthermore, a group of jacking pipes are arranged every 10-20 m, and the angle is 30 degrees in the oblique upward direction.

Compared with the prior art, the method has the advantages that the specially-made threaded weld steel pipe is accurately jacked into the goaf by using the jacking pipe device, the gap is plugged by injecting the high-molecular composite material, and then the gas is extracted by using the gas drainage pipe. The invention can efficiently and accurately complete the pipe insertion in the goaf, greatly reduce the construction difficulty and the construction cost, improve the accuracy of the pipe insertion position, ensure the gas drainage effect and effectively prevent the gas concentration in the roadway from exceeding the limit.

Drawings

FIG. 1 is a schematic view showing the flowing direction of gas in a gob;

FIG. 2 is a top tube sectional view;

FIG. 3 is a schematic view of a jacking pipe installation jacking device;

FIG. 4 is a schematic plan view of a gob jacking pipe;

FIG. 5 is a schematic sectional view of a gob jacking pipe;

FIG. 6 is a schematic view of the extraction tube installation;

in the figure, 1-a top pipe, 2-a screen mesh, 3-a telescopic jack, 4-a baffle, 5-polyurethane, 6-a valve and 7-a drainage pipe.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

As shown in fig. 2, 3 and 6, the Y-shaped ventilation working face goaf pipe-jacking gas extraction device comprises a plurality of groups of telescopic jacks 3 installed in a roadway, a pipe jacking 1 is installed at the front ends of the telescopic jacks 3, sieve meshes 2 are uniformly arranged at the front ends of the pipe jacking 1, a drainage pipe 7 is arranged in the pipe jacking 1, two groups of baffles 4 are arranged at the front end of the drainage pipe 7, a water absorbing material 5 is arranged between the two groups of baffles 4, a polyurethane solution is arranged on the water absorbing material 5, the rear end of the drainage pipe 7 is connected with a drainage pipeline, and an observation hole and a valve 6 are arranged on the drainage pipeline.

Example (b):

a Y-shaped ventilation mode is adopted on a certain working face, and gas in a goaf escapes to one side of a repaired roadway under the influence of air flow of an air inlet roadway, so that the concentration of the gas in the repaired roadway exceeds the limit. In order to solve the problem of the over-limit of the concentration of the roadway-repairing gas, the device and the method for extracting the pipe-jacking gas in the goaf of the Y-shaped ventilation working face are adopted to solve the problem of the over-limit of the concentration of the roadway-repairing gas.

As shown in the figure, the Y-shaped ventilation working face goaf pipe jacking device provided by the embodiment comprises a specially-made spiral weld steel pipe and a telescopic jack.

The diameter DN of the spiral steel pipe is 200, the length of the spiral steel pipe is 2m, the front end of the steel pipe is tapered, and the sieve mesh is uniformly arranged 1.5m in front of the steel pipe; the telescopic jack selects a first-stage or second-stage telescopic jack according to parameters such as the width height of a compensation tunnel, the total length of the first-stage telescopic jack is 5000mm, and the effective vertical thrust is 1500 KN. The total length of the second-stage telescopic jack is 8000mm, and the effective vertical thrust is 1600 KN.

The method for the Y-shaped ventilation working face pipe-jacking gas extraction device in the embodiment is characterized in that the Y-shaped ventilation working face goaf pipe-jacking gas extraction device is used, and a special threaded weld steel pipe is accurately jacked into a goaf by using a telescopic jack. And then, a polyurethane hole sealing method is adopted, polyurethane foam enters rock cracks of the goaf through the meshes on the jacking pipe to enhance the hole sealing effect, and the gas extraction efficiency is improved.

And (3) jacking a steel pipe obliquely upwards by 30 degrees at the 4502 working face at one side of the roadway repairing and close to the goaf by using a telescopic jack every 10-20 m until the whole steel pipe is completely jacked, and avoiding larger rocks in the pipe jacking process.

After the pipe jacking is completed, a drawing and releasing pipe with the inner diameter of 110mm and the length of 2m is prepared, a baffle plate is installed at the positions of 0.3m and 1.5m of the drawing and releasing pipe by adopting a polyurethane hole sealing method, a polyurethane solution adopted for hole sealing is prepared in advance, the solution is fully poured on a towel, towel cloth is wound on the drawing and releasing pipe while the solution is poured, and the drawing and releasing pipe between the baffles at two ends of the drawing and releasing pipe is ensured to be uniformly wound. After winding is completed, the drawing and releasing pipe is rapidly inserted into the top pipe and fixed to prevent shaking to influence the hole sealing quality.

After hole sealing is carried out for 5 minutes, the polyurethane solution starts to foam and expand, foaming can permeate into the goaf through the meshes on the jacking pipe to seal gaps, and extraction negative pressure can be effectively guaranteed. After 20 minutes, the foaming was gradually stopped and the curing was gradually carried out.

And sealing the hole with polyurethane for 1 hour, and then connecting the hole with an extraction pipeline. And the extraction pipeline is provided with an observation hole and a valve for taking gas and detecting the spontaneous combustion ignition marker gas at any time.

By adopting the Y-shaped working face goaf pipe-jacking gas extraction device and method, the safety problem that the concentration of 4502 working face roadway-repairing gas is out of limit can be effectively solved.