CN215332979U

CN215332979U - Combined plugging system for coal mine gas extraction

Info

Publication number: CN215332979U
Application number: CN202121857339.5U
Authority: CN
Inventors: 郝天坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2021-12-28
Anticipated expiration: 2031-08-10

Abstract

The utility model provides a coal mine gas extraction combined plugging system, and provides a device capable of quickly and effectively plugging and extracting gas. The combined plugging system for the gas extraction of the coal mine comprises a pipe bundle part and a module part, wherein the pipe bundle part comprises a gas extraction pipe, a water injection pipe and a grouting pipe, and a first module, a second module, a third module and a fourth module which are sequentially arranged from front to back at intervals along the pipe bundle part and have the same structure, each module consists of a front end plate, a rear end plate and a rubber body positioned between the two end plates, elastic steel rings are arranged at two ends of the rubber body, and the steel rings are matched with annular clamping grooves on the front end plate and the rear end plate; the front end plate and the rear end plate are connected into a whole through a round steel cylinder. The utility model can effectively seal the gas extraction drill hole, extract the gas in the drill hole and effectively prevent the gas from escaping outwards by prolonging the plugging length.

Description

Combined plugging system for coal mine gas extraction

Technical Field

The utility model relates to a colliery gas drainage technical field.

Background

The gas extraction is a fundamental measure for preventing and treating gas accidents in coal mines in China, and plays a good role in preventing outburst and comprehensively treating gas in the aspect of preventing and treating gas disasters.

The existing underground coal mine gas extraction and hole sealing technology can refer to the following technologies:

CN111561291A discloses a double-layer extrusion type hole sealing device and a hole sealing method for a gas extraction drilled hole, wherein the device comprises a capsule, an injection expansion type pipe, two water injection pipes, a grouting pipe and three pressure gauges; the hole sealing method is that the capsule is filled by matching the inherent shape with the expanding agent, and water is injected into the expanding agent to expand the expanding agent to form supporting seal; injecting non-solidified slurry into the upper part of the annular cavity through a grouting pipe, and stopping grouting after a pressure gauge on the grouting pipe reaches a set value; and then injecting high-pressure water into the injection expansion type pipe to expand the pipe, enabling the non-solidified slurry to penetrate into the gap of the coal body crack through the expansion pressure of the pipe to form liquid sealing with the coal body, and enabling the gas concentration in gas extraction to be reduced to a certain concentration to carry out multiple hole sealing through grouting on the upper part of the annular cavity.

The CN210113376U discloses a gas drainage drilling plugging structure, relates to the technical field of gas drainage, and specifically relates to a gas drainage drilling plugging structure, which comprises a case, wherein a slide hole is formed in the bottom of the case, a supporting flat rod is connected to the inner wall of the slide hole in a sliding manner, one end, far away from the case, of the supporting flat rod is fixedly connected with a supporting leg, a drainage pipe is arranged inside the case, a gas hole packer is connected to the bottom end of the drainage pipe in a threaded manner, and a one-way air valve is fixedly connected with a threaded connector. According to the gas extraction drilling hole plugging structure, the type A liquid can be pushed into the liquid separating pipe through the liquid outlet pipe through the arrangement of the gas hole packer upper ejection push plate, the liquid pushing rod, the liquid pushing piston, the liquid sealing piston and the liquid storage cavity, and then enters the cavity from the liquid outlet hole to be subjected to chemical reaction with the type B liquid in the cavity, so that the expansion bag is made to expand to achieve the hole sealing effect.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides a combined plugging system for coal mine gas extraction, and realizes a device capable of quickly and effectively plugging and extracting gas.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the coal mine gas extraction combined plugging system comprises a pipe bundle part and a module part, wherein the pipe bundle part comprises a gas extraction pipe, a water injection pipe and a grouting pipe, and a first module, a second module, a third module and a fourth module which are sequentially arranged from front to back at intervals along the pipe bundle part and have the same structure, each module consists of a front end plate, a rear end plate and a rubber body positioned between the two end plates, the rubber body made of an elastic material is of a cylindrical structure, two ends of the rubber body are provided with elastic steel rings, and the steel ring part is matched with annular clamping grooves in the front end plate and the rear end plate;

the front end plate and the rear end plate are connected into a whole through a round steel cylinder;

the inner cavity of the rubber body of each module is filled with expansion materials.

Furthermore, the front end plate is formed by combining two sub-plates, and the two sub-plates are fastened by fastening bolts.

Further, the steel cylinder and the front and rear end plates are fixed by riveting or welding.

Further, the gas extraction pipe penetrates through the four modules and is connected to the gas storage tank through gas extraction.

Furthermore, one end of the water injection pipe is connected with the water tank through a water pump, the other end of the water injection pipe is sealed, and water injection ports are arranged in the four modules corresponding to the water injection pipe.

Furthermore, slip casting pipe one end is connected the slip casting machine, and the other end is uncovered and is located between two adjacent modules.

The utility model has the beneficial effects that:

the utility model can effectively seal the gas extraction drill hole, extract the gas in the drill hole and effectively prevent the gas from escaping outwards by prolonging the plugging length.

7 seals are formed in the sealing device, so that the problem of gas leakage at the position of a drilling hole is effectively solved.

Drawings

Figure 1 is a perspective view of the present invention.

Fig. 2 is a perspective view of the first module.

Fig. 3 is a cross-sectional view of module number one.

Fig. 4 is a partial cross-sectional view of the rubber body.

Fig. 5 is a perspective view of the rubber body.

Fig. 6 is a diagram of the arrangement of water injection pipes in the system.

Fig. 7 is a layout of grouting pipes in the system.

Figure 8 is a schematic diagram of the present occlusion system.

In the figure:

a first module 10, a front end plate 11, a 111 fastening bolt, a 112 annular clamping groove, a rear end plate 12, a 13 rubber body, a 131 steel ring, a 14 steel cylinder,

the number 20 of the second module is,

the number 30 of the third module is,

a module No. 40, which is a fourth module,

a 50-gas extraction pipe is arranged in the gas extraction pipe,

60 a water injection pipe is arranged on the water tank,

70 grouting pipe.

Detailed Description

The hole sealing method of the coal mine gas extraction combined plugging system comprises the following steps:

the pipe bundle part comprises a gas extraction pipe 50, a water injection pipe 60 and a grouting pipe 70, and the three types of pipelines are arranged in a bundle shape. Wherein, the gas extraction pipe adopts phi 50 galvanized steel pipes, and the number of the gas extraction pipes is one. The water injection pipe adopts phi 10PVC hose, and quantity is one, and this water injection pipe one end passes through the water pump with the water tank and is connected, supplies water, and the other end seals to set up the water filling port in four modules that the water injection pipe corresponds. The grouting pipe is made of a phi 20 galvanized steel pipe, one end of the grouting pipe is connected with the grouting machine, and the other end of the grouting pipe is located between two adjacent modules and used for grouting in a space between the two adjacent modules.

Referring to fig. 1 to 5, from front to back, a first module 10, a second module 20, a third module 30 and a fourth module 40 are provided, wherein the first module and the fourth module have the same decoding structure, the second module and the third module have the same structure, and the effective lengths of the second module and the third module are obviously longer than those of the first module and the fourth module.

The four module structures are as follows:

each module is composed of a front end plate 11, a rear end plate 12 and a rubber body 13 positioned between the two end plates, wherein the front end plate and the rear end plate are round structural parts and are subjected to anticorrosion treatment. The rubber body is cylindrical as a whole, and elastic steel rings 131 are provided at both ends of the rubber body 13, and the steel rings expand both ends of the rubber body to form a circular contour. The steel ring part is matched with the annular clamping grooves on the front end plate and the rear end plate.

The front end plate 11 is formed by combining two sub-plates, the two sub-plates are fastened by fastening bolts 111, an inwards concave annular clamping groove 112 is formed between the two sub-plates, and the annular clamping groove is provided with a recess from inside to outside and is used for being buckled with a steel ring.

The rear end plate is the same as the front end main body and symmetrically arranged, the front end plate and the rear end plate are connected into a whole through a round steel cylinder 14, and the steel cylinder 14 and the front end plate and the rear end plate can be fixed in a riveting and welding mode. The inner diameter of the steel cylinder is the same as the outer diameter of the gas extraction pipe, and a gas extraction channel is formed.

Further, a sealing rubber ring may be provided between the steel cylinder 14 and the gas extraction pipe.

And a water injection pipe and a grouting pipe are arranged behind the front end plate and the rear end plate according to the position requirement.

Referring to fig. 6 to 8, the implementation of the present invention will be described in detail with reference to the drawings.

Step one, drilling: drilling holes from the roadway to a specific direction by using drilling equipment, wherein the drilling holes are positioned at gas pre-drainage drilling holes;

step two, cleaning: the drill hole is thoroughly cleaned by using compressed air, so that no drill cuttings exist in the drill hole;

step three, grouting and sealing holes, which comprises the following specific steps:

with this device whole stretch into drilling inside from the tunnel, and according to design drawing adjustment male degree of depth, then, through quick-operation joint with water injection pipe and water injection pump headtotail, and the mode through the water injection is to the internal injection clear water of the rubber of four modules, after the water injection, the internal expanding material of rubber meets the water and takes place the inflation, prop the rubber body through the expansive force, and expand tightly in the narrow and small space between drilling and module, the preferred sulphoaluminate type expansion cement that adopts of material of this inside, natural maintenance to sclerosis can.

After 24 hours of maintenance, the grouting pipe is connected with a grouting slurry pumping system through a quick connector, slurry is pumped in the space between the first and second grouting pipes and the space between the third and fourth grouting pipes, the pressure of the pumped slurry is set to be grouting pressure of 0.3MPa, and the grouting pipes are naturally maintained until the grouting pipes are hardened. And then, pumping slurry into the space between the second and third spaces, setting the pressure of the pumped slurry to be grouting pressure of 0.5MPa, and naturally curing until the slurry is hardened.

Through the maintenance, form multichannel sealed between four modules and adjacent module, and the in-process of pump sending thick liquids is in the pressurized state, and thick liquids get into the infiltration region, carries out effectual shutoff to the crack region of drilling, realizes better sealed effect.

Step four, gas extraction: and starting the gas extraction pump, and conveying the gas extracted by the gas extraction pipe to the gas storage tank.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the scope of the present invention, and various modifications and improvements of the present invention by those skilled in the art without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.

Claims

1. The combined plugging system for coal mine gas extraction comprises a pipe bundle part and a module part, wherein the pipe bundle part comprises a gas extraction pipe (50), a water injection pipe (60), a grouting pipe (70), a first module (10), a second module (20), a third module (30) and a fourth module (40) which are sequentially arranged from front to back at intervals along the pipe bundle part and have the same structure, each module consists of a front end plate (11), a rear end plate (12) and a rubber body (13) positioned between the two end plates, the rubber body made of an elastic material is of a cylindrical structure, elastic steel rings (131) are arranged at two ends of the rubber body (13), and the steel ring parts are matched with annular clamping grooves in the front end plate and the rear end plate;

the front end plate and the rear end plate are connected into a whole through a round steel cylinder (14);

2. The coal mine gas extraction combined plugging system according to claim 1, wherein the front end plate (11) is formed by combining two sub-plates, and the two sub-plates are fastened by fastening bolts (111).

3. The coal mine gas extraction combined plugging system according to claim 2, wherein the steel cylinder (14) is fixed with the front and rear end plates in a riveting or welding manner.

4. The coal mine gas extraction combined plugging system of claim 1, wherein the gas extraction pipe passes through four modules and is connected to a gas storage tank through gas extraction.

5. The coal mine gas extraction combined plugging system according to claim 1, wherein one end of the water injection pipe is connected with the water tank through a water pump, the other end of the water injection pipe is closed, and water injection ports are arranged in four modules corresponding to the water injection pipe.

6. The coal mine gas extraction combined plugging system according to claim 1, wherein one end of the grouting pipe is connected with the grouting machine, and the other end of the grouting pipe is open and located between two adjacent modules.