CN205558865U - Gas drainage hole sealing slip casting device for coal mine - Google Patents

Abstract

The utility model discloses a gas drainage sealing and grouting device for coal mines, which comprises a portable pneumatic grouting pump, a coal mine gas pressure fast grouting sealing device, a solid sealing pipe and a gas sealing pipe extraction device. The portable pneumatic grouting pump is connected to the grout return pipe of the coal mine gas pressure rapid grouting and sealing device, the sealing pipe is connected to the gas sealing pipe extraction device, and the gas sealing pipe extraction device is connected through the sealing pipe Gas pipeline. The utility model has a reasonable structural design, and realizes the hole sealing and grouting under pressure and airtight conditions, so that the cracks around the borehole are tightly filled, and the drainage air leakage channel is eliminated. The problem of poor sealing effect and low gas drainage efficiency existing in the sealing process is solved. The compressive strength of the flower tube part is increased, and the extrusion fracture is reduced; the effective section through which the gas flows is large, which reduces the extraction resistance; and prevents small coal particles from clogging or entering the extraction pipeline.

Description

A coal mine gas drainage sealing hole grouting device

technical field

The utility model relates to the technical field of sealing and drainage of gas drilling, in particular to a sealing and grouting device for gas drainage in coal mines.

Background technique

At present, there are mainly the following types of hole sealing technologies for coal mine gas drainage:

①Polyurethane sealing technology: domestic drilling through coal seams generally adopts "polymer foam" materials, among which polyurethane is used as the main material for hole sealing.

②Mechanical elastic hole sealing technology.

③Inflatable hole sealer: There are two main types of inflatable hole sealer, one is the non-inflatable airbag type, and the other is the inflatable airbag type.

④Hydraulic expansion type hole sealing device.

⑤Polyurethane and cement sealing technology: domestic drilling through coal seams generally adopts "polymer foam" materials, in which polyurethane is used as the main material to temporarily seal the holes, and then inject cement slurry into the holes until the holes naturally return to the slurry. Grouting.

Currently used sealing pipes, domestic gas drainage generally adopts polyvinyl chloride (PVC) pipes or steel pipes, and single-layer and coal seam sections adopt round-hole flower pipes. The sealing materials used mainly include polyurethane, cement and expansive cement. The sealing device used in sealing the hole is a pneumatic grouting pump

The prior art has the following disadvantages:

(1) Sealing technology:

①Polyurethane sealing technology: low compressive strength, large compressible space, cracks are likely to occur in the coal body around the drill hole, forming air leakage channels.

②Mechanical elastic hole sealing technology: poor sealing performance and serious air leakage.

③Inflatable hole sealer: it can only be used for temporary hole sealing.

④Hydraulic expansion type hole sealer: high cost, prone to micro-leakage, no long-term sealing effect.

⑤Polyurethane and cement sealing technology: when the polyurethane is blown into the antistatic woven bag used for sealing the hole with a compressed air device for expansion and sealing, it is easy to cause uneven expansion of the sealing, and the woven bag will also hinder the polyurethane from surrounding the hole wall. If the cracks are sealed and infiltrated, the result will affect the airtightness of the sealing hole, and it can only play the role of fixing the sealing tube. When injecting cement slurry into the borehole, because the hole is not a pressurized and closed space, effective pressure cannot be formed, resulting in uneven grouting in the hole, which directly affects the sealing, penetration, and sealing of the cracks around the hole wall by the grout, resulting in hole The inner slurry cannot seal the hole tightly.

(2) Hole sealing pipe: polyvinyl chloride (PVC) pipe or steel pipe, single layer, and round hole flower pipe for coal seam section. Polyvinyl chloride (PVC) pipes have low single-layer compressive strength and are prone to breakage; the effective cross-section of the gas flowing into the round-hole flower pipe is small, and the extraction resistance is large; broken coal particles are easy to enter the extraction pipeline, which is harmful to the extraction system. cause blockage and damage.

(3) Hole sealing material: Polyurethane material is an organic material, and there is an interface problem with the rock (inorganic material) on the wall of the borehole, which is difficult to be densely bonded, and has low compressive strength and a large compressible space. The stress action is easy to produce cracks and form air leakage channels. Practice has proved that the gas concentration in the early stage of polyurethane sealing is relatively high, but after a period of time, the gas concentration drops rapidly; pure cement material has a long solidification time after grouting, and rapid hole sealing cannot be achieved.

(4) Sealing device: Pneumatic grouting pumps are widely used now, without supporting stirring devices, and manual stirring is used to make slurry.

Utility model content

The purpose of the utility model is to provide a coal mine gas drainage sealing hole grouting device to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions:

A gas drainage sealing and grouting device for coal mines, including a portable pneumatic grouting pump, a coal mine gas pressure fast grouting and sealing device, a solid sealing pipe and a gas sealing pipe extraction device, the portable pneumatic grouting The pump is connected to the grout return pipe of the coal mine gas pressure rapid grouting and sealing device, and the portable pneumatic grouting pump is equipped with a pressure three-control grouting device; the coal mine gas pressure rapid grouting and sealing device extends into the borehole A two-way annular blasting valve is installed in the middle of the pipe section, and annular check valves are installed at both ends of the pipe section where the coal mine gas rapid grouting and sealing device under pressure extends into the borehole; The pipe is equipped with a pressure double-control pressure device; the sealing pipe is connected to the gas sealing pipe extraction device, and the gas sealing pipe extraction device is connected to the gas pipeline through the sealing pipe.

As a further solution of the utility model: the gas sealing pipe extraction device is a double-layer PVC pipe structure, and a high-temperature-resistant and flame-retardant filter screen is arranged between the two-layer PVC pipes.

As a further solution of the utility model: the diameter of the sealing pipe is 30-63.5 mm.

As a further solution of the utility model: the diameter of the gas sealing pipe extractor is 30-75mm.

As a further solution of the utility model: the maximum pressure value of the two-way annular blasting valve is 1.2 MPa.

Compared with the prior art, the beneficial effect of the utility model is: the utility model has a reasonable structural design, and realizes the sealing and grouting under pressure and airtight conditions, so that the cracks around the drilling holes are tightly filled, and the gas leakage is eliminated. aisle. It solves the problems of poor sealing effect and low gas drainage efficiency existing in other sealing processes. The compressive strength of the flower tube part is increased, and extrusion fracture is reduced; the effective cross-section through which the gas flows is large, which reduces the extraction resistance; and prevents small coal particles from clogging or entering the extraction pipeline. The mixing tank is used to make the slurry, which solves the problems of slow manual mixing, uneven slurry, and high labor intensity. The time for hole sealing and hole formation is reduced, and gas drainage can be carried out in advance. The gas extraction efficiency is high and the operation is convenient. Increased drilling life, low cost, safe and efficient.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a grouting effect diagram of the utility model.

In the figure: 1-portable pneumatic grouting pump, 2-coal mine gas pressure fast grouting sealing device, 3-sealing real pipe, 4-gas sealing pipe extractor, 5-ring check valve, 6- Two-way annular blasting valve, 7-with pressure three-control grouting device instrument, 8-with pressure double-control pressure device instrument.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figures 1 to 2. In an embodiment of the present utility model, a coal mine gas drainage sealing and grouting device includes a portable pneumatic grouting pump 1, a coal mine gas pressure rapid grouting and sealing device 2, and a hole sealing device. pipe 3 and gas sealing pipe extractor 4, the portable pneumatic grouting pump 1 is connected to the grout return pipe of the coal mine gas pressure fast grouting sealing device 2, and the portable pneumatic grouting pump 1 is equipped with a pressure three The grouting control device 7 controls the grouting pressure of the grouting pump, controls the grouting pressure in the capsule, and controls the grouting pressure in the fracture zone; the coal mine gas pressure fast grouting and sealing device 2 is installed in the middle of the pipe section extending into the borehole. Annular blasting valve 6, after the diaphragm is blasted, it can change the flow direction of the slurry. It has a compact and firm structure and is easy to install. It is suitable for the narrow environment of underground gas grouting drainage drilling in coal mines. The blasting pressure is stable, and it is less affected by external interference and ambient temperature. ; Coal mine gas under pressure fast grouting hole sealing device 2 is installed with annular check valve 5 at both ends of the pipe section extending into the borehole, so that the slurry can flow in one direction and stop in the opposite direction; coal mine gas under pressure fast The grout return pipe of the grouting sealer 2 is equipped with a pressure double control pressure device instrument 8 to control the pressure before and after the grout return to realize grouting under pressure; the actual sealing pipe 3 is connected to the gas sealing pipe extraction device 4 , the gas sealing pipe extractor 4 is connected to the gas pipeline through the sealing pipe 3 .

Further, the gas sealing pipe extraction device 4 described in the utility model is a double-layer PVC pipe structure, and a high-temperature-resistant and flame-retardant filter screen is arranged between the two-layer PVC pipes; the compressive strength is increased, and the coal mass is greatly reduced. The possibility of extrusion fracture; the effective section of gas flowing into the sealing pipe 3 is large, which reduces the extraction resistance; the filter screen prevents coal particles from clogging or entering the extraction pipeline.

Further, the diameter of the sealing pipe 3 described in the present invention is 30-63.5mm.

Further, the diameter of the gas sealing pipe extraction device 4 described in the present invention is 30-75mm.

Further, the maximum pressure value of the two-way annular blasting valve 6 in the present invention is 1.2MPa.

The high-efficiency grouting cement slurry in the utility model is made by uniformly mixing water, cement, and high-efficiency grouting additives in a ratio of 0.8:1:0.05. The initial setting is 5 minutes, and the final setting is 10 minutes. The setting time is short, and gas pumping can be performed faster. mining, improve work efficiency.

The utility model adopts the pressure fast grouting sealing device 2 for coal mine gas. On the one hand, the pressure grouting can fill the cracks around the borehole and eliminate the initial air leakage channel; on the other hand, the borehole can be reliably supported and ensured. It ensures the stability of the drilling, makes it difficult to generate new air leakage channels (cracks) around the drilling, hinders the generation and development of later air leakage channels, and has the characteristics of strong sealing and airtightness.

The utility model adopts a portable pneumatic grouting pump 1. The grouting pump itself is small in weight and easy to carry; the grout is made uniformly, which ensures the quality of the grout; and does not need manual stirring, which reduces labor intensity and grouting time.

The utility model gas drainage sealing grouting equipment for coal mines has the advantages of "large aperture, large flow rate, filtering type, and tight airtight sealing", which improves the efficiency of gas drainage and shortens the time for realizing the gas drainage rate. In a short time, the drainage problems that often occurred due to unrealistic hole sealing, poor drainage effect, long time to reach the expected gas drainage rate, and damage to the borehole caused by secondary pressure were solved.

The operating steps of the present utility model are:

① After the hole is drilled, the gas sealing pipe extractor 4 is lowered to the coal passing section, and the sealing pipe 3 is connected externally to the orifice.

② According to the specified length of the measures, the coal mine gas pressure fast grouting sealing device 2 and the sealing pipe 3 are bound and sent into the hole at the same time.

③ The threads of the joints of the sealing pipe 3 must be tightened. When using plug-in sealing pipes, the connections must be tight so as to avoid gas leakage during gas extraction and affect the extraction effect.

④ Connect the grouting pipe of the pressure fast grouting sealing device 2 of the coal mine gas to the pressure three-control grouting device 7, and then connect it to the portable pneumatic grouting pump 1, add water, cement, and high-efficiency The grouting additives are mixed according to the ratio of 0.8:1:0.05, and the grouting is started.

⑤ Portable pneumatic grouting pump 1 injects grout into the hole. The pre-bag grouting pressure is controlled at 0.4MPa, and then controlled at 0.7MPa. Grouting to achieve multi-layer sealing. The final pressure of grouting is generally 2MPa.

⑥ After the cement slurry is solidified, connect the sealing pipe 3 to the gas drainage pipeline for gas drainage.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from all points of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to be included in the claims All changes within the meaning and range of equivalents of the required elements are included in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (5)

1. A gas drainage sealing and grouting device for coal mines, including a portable pneumatic grouting pump (1), a coal mine gas pressure rapid grouting and sealing device (2), a sealing pipe (3) and a gas sealing Pipe extraction device (4), characterized in that the portable pneumatic grouting pump (1) is connected to the grout return pipe of the coal mine gas pressure fast grouting sealing device (2), and the portable pneumatic grouting pump (1) A pressure three-control grouting device instrument (7) is installed on the top; a two-way annular blasting valve (6) is installed in the middle of the pipe section of the coal mine gas pressure rapid grouting sealing device (2) extending into the borehole, and the coal mine gas is under pressure. An annular check valve (5) is installed at both ends of the pipe section of the rapid grouting sealing device (2) extending into the borehole; Pressure double control pressure device instrument (8); the sealing pipe (3) is connected with the gas sealing pipe extraction device (4), and the gas sealing pipe extraction device (4) is connected to the gas sealing pipe (3) pipeline. 2. The coal mine gas extraction sealing and grouting device according to claim 1, characterized in that, the gas sealing pipe extraction device (4) is a double-layer PVC pipe structure, and a double-layer PVC pipe is provided between two layers of PVC pipes. There is a high temperature and flame retardant filter. 3. The sealing and grouting device for coal mine gas extraction according to claim 1, characterized in that the diameter of the sealing pipe (3) is 30-63.5mm. 4. The gas drainage sealing and grouting device for coal mine according to claim 1, characterized in that the gas sealing pipe extraction device (4) has a diameter of 30-75mm. 5. The sealing and grouting device for coal mine gas extraction according to claim 1, characterized in that the maximum pressure value of the bidirectional annular blasting valve (6) is 1.2 MPa.