Pressure grouting, water filtering and slurry returning hole packer

Abstract

The utility model discloses a pressurized grouting, water filtering and slurry returning hole packer, and particularly belongs to the field of coal mine equipment. The hole packer comprises two double-layer filter cloth bags, a PE (polyethylene) antistatic flame-retardant black grouting pipe, a returned slurry filter pipe and a gas drainage pipe, the two double-layer filtering cloth bags are arranged at the front end and the rear end of the PE anti-static flame-retardant black grouting pipe in a fastened mode, four 8mm grouting holes are formed in the double-layer filtering cloth bags at the front end and the rear end of the PE anti-static flame-retardant black grouting pipe respectively, and one to two internal expansion burst valve grouting holes are formed in the middle section of the PE anti-static flame-retardant black grouting pipe. The rear end of the PE antistatic flame-retardant black grouting pipe is provided with a grouting quick-plug connector in a locking mode. An external pressure explosion valve slurry return hole and dense small holes are formed in the slurry return water filter pipe, and the slurry return water filter pipe is sleeved with a filter cloth cylinder; rubber plugs are plugged at the front ends of the grouting pipe and the slurry returning and filtering pipe; and the gas drainage pipe penetrates through the middle of the double-layer filter cloth bag. According to the device, excessive water and air can be filtered and discharged, viscous high-concentration cement paste is left to fill and seal the drill hole, and coal rock gaps around the drill hole can be filled.

Description

Technical Field

[0001] The utility model relates to the field of coal mine equipment, in particular to a pressure grouting, water filtering and grouting hole sealing device. Background Art

[0002] Currently, due to the relatively backward sealing technology for gas extraction holes in coal seams, most coal mine gas drilling holes are not tightly sealed, resulting in serious gas leakage. This fills the coal mine tunnels with gas, posing a safety hazard. This leads to low gas concentrations extracted by gas extraction pumps, prolonged extraction times, resulting in mining misalignment and a lack of succession at the coal face, causing significant losses. Furthermore, the recovered gas concentration is too low to meet the concentration requirements for gas power generation. Furthermore, sealing times are long, work efficiency is low, and overall costs are high.

[0003] Therefore, it is necessary to develop a pressure grouting water filtration and slurry sealing device to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a pressure grouting water filtering and grouting hole sealing device which can filter out excess water in the cement slurry in the borehole, increase the slurry concentration in the hole and achieve rapid solidification, no shrinkage and good sealing performance.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A pressure grouting, water filtration and return grouting hole sealer, comprising two double-layer filter bags, a PE anti-static and flame-retardant black grouting pipe, a return grouting and water filtration pipe, and a gas extraction pipe; the two double-layer filter bags are fastened to the front and rear ends of the PE anti-static and flame-retardant black grouting pipe, the front and rear ends of the PE anti-static and flame-retardant black grouting pipe are each provided with four 8mm grouting holes, the middle section of the PE anti-static and flame-retardant black grouting pipe is provided with one to two grouting holes for internal expansion and bursting valves, and the rear end of the PE anti-static and flame-retardant black grouting pipe is locked with a grouting quick-connect connector;

[0007] The return slurry filter pipe is provided with an external pressure bursting valve return slurry hole, dense small holes and a filter cloth tube; the front ends of the PE anti-static and flame-retardant black grouting pipe and the return slurry filter pipe are plugged with rubber plugs; the gas extraction pipe is set through the middle of the double-layer filter bag.

[0008] Specifically, the double-layer filter bag, the return slurry filter pipe and the PE anti-static and flame-retardant black grouting pipe are all locked and fixed by aluminum alloy pipe clamps.

[0009] The beneficial effects of the present invention are:

[0010] This application can filter out excess water and air, preventing the excess water and air from remaining in the borehole and causing it to dry out and become semi-hollow, leaving behind a viscous, high-concentration cement slurry that fills and seals the borehole and squeezes into the coal and rock gaps around the borehole to seal leaks. This ensures safe coal mine operations and surpasses any gas sealing product currently used in coal mines, significantly increasing coal seam gas extraction concentration. It offers the advantages of low sealing cost, reduced labor intensity, reduced staffing, improved sealing quality, flexible sealing length, and a high safety factor.

[0011] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of the pressure grouting water filtering and grouting hole sealing device provided by the utility model;

[0013] Explanation of the accompanying symbols: 1. Double-layer filter bag; 2. PE anti-static and flame-retardant black grouting pipe; 3. Return slurry filter pipe; 4. Gas extraction pipe; 5. Grouting hole; 6. Grouting hole for internal expansion bursting valve; 7. Grouting quick-plug connector; 8. Return slurry hole for external pressure bursting valve; 9. Dense small holes; 10. Filter cloth tube; 11. Rubber plug; 12. Aluminum alloy pipe clamp. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0017] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] See Figure 1 The utility model provides a pressure grouting water filtering and return grouting hole sealing device, comprising two double-layer filter bags 1, a PE anti-static and flame-retardant black grouting pipe 2, a return grouting filter pipe 3 and a gas extraction pipe 4; the two double-layer filter bags are fastened to the front and rear ends of the PE anti-static and flame-retardant black grouting pipe, four 8mm grouting holes 5 are respectively provided at the front and rear ends of the double-layer filter bags, the middle section of the PE anti-static and flame-retardant black grouting pipe is provided with 1-2 internal expansion and bursting valve grouting holes 6, and the rear end of the PE anti-static and flame-retardant black grouting pipe is locked with a grouting quick-plug connector 7;

[0019] The return slurry filter pipe is provided with an external pressure bursting valve return slurry hole 8, dense small holes 9 and a filter cloth tube 10; a rubber plug 11 is plugged at the front end of the grouting pipe and the return slurry filter pipe; the gas extraction pipe is set through the middle of the double-layer filter bag.

[0020] Specifically, the double-layer filter bag, the return slurry filter pipe and the PE anti-static flame-retardant black grouting pipe are all locked and fixed by the aluminum alloy pipe clamp 12.

[0021] Specifically, a return grouting filter pipe with densely-packed small holes and a filter cloth sleeve can expel air from the hole during grouting, filter out excess water, and increase the grout concentration. The bursting valve is then ruptured under the high pressure of the grouting process, achieving the goals of pressurized grouting, water filtration, and return grouting. This increases the concentration of the cement slurry injected into the hole, achieving a solid core seal and avoiding the phenomenon of the intermediate section of cement slurry drying and becoming semi-hollow.

[0022] Specifically, two 8mm slurry holes are drilled side by side on the 10mm return slurry filter pipe behind the front double-layer filter bag. The external pressure bursting valve return slurry hole is made of a section of PVC hose with a diameter of 20mm and a length of 120mm with a pinhole. This can ensure that when the middle section is filled with slurry to seal the borehole and the surrounding coal seam cracks, the grouting pressure reaches about 1.0-1.5MPa, which can effectively break the external pressure bursting valve return slurry hole and return slurry outward, eliminating the possibility of excessive grouting pressure, leakage of slurry after squeezing open the front and rear double-layer filter bags, and damage to the borehole.

[0023] Specifically, the front and rear double-layer filter bags of this application can be customized with different diameters and lengths according to the size of the drill hole, the softness of the coal seam and the needs of customers.

[0024] When in use, after the downhole is drilled, the present invention is tied to the extraction sealing pipe, inserted into the borehole and leaving the tail end locked with a quick-plug connector to connect the grouting pipe on the grouting pump, and the grouting pump is turned on for grouting. The slurry enters the front and rear double-layer filter bags of the present invention and expands and seals the front and rear double-layer filter bags in succession during grouting. When the grouting pressure reaches or exceeds 1.0-2MP, 1-2 grouting holes of the external pressure burst valve on the middle section PE anti-static flame-retardant black grouting pipe are broken under pressure to grout toward the middle section; when the grouting hole of the external pressure burst valve bursts, the pressure gauge on the grouting pump will increase from 1.0-1.6MPa When the pressure drops to about 0-0.1MPa, and the grouting pump continues grouting and the pressure gauge slowly rises, a large amount of water is filtered out through the grouting pressure and discharged from the return filter pipe, so that the cement slurry concentration in the return hole of the external pressure blasting valve is increased, and the high-concentration cement slurry continuously penetrates into the cracks around the coal rock in the borehole, blocking the leakage channel and preventing the possibility of gas leakage. When the grouting pressure in the middle section reaches 1.0MPa-1.5MPa, the return hole of the external pressure blasting valve is broken by the grouting pressure, and the high-concentration cement slurry flows out of the borehole along the filter return pipe, completing the grouting and sealing work. At this time, the entire sealing section and the surrounding coal rock cracks have been completely filled and densely filled with high-concentration cement slurry.

[0025] In summary, this application can filter out excess water and air, preventing the residual water and air from remaining in the borehole and causing it to dry out and become semi-hollow, leaving behind a viscous, high-concentration cement slurry that fills and seals the borehole and squeezes into the coal and rock gaps surrounding the borehole to seal leaks. This ensures safe coal mine operations, surpassing any gas sealing product currently used in coal mines, and significantly improving coal seam gas extraction concentration. It offers the advantages of low sealing cost, reduced labor intensity, reduced staffing, improved sealing quality, flexible sealing length, and a high safety factor.

[0026] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0027] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A pressure grouting water filtration and grouting sealing device, characterized in that: It includes two double-layer filter bags, a PE anti-static and flame-retardant black grouting pipe, a return slurry filter pipe and a gas extraction pipe; the two double-layer filter bags are fastened to the front and rear ends of the PE anti-static and flame-retardant black grouting pipe, and the front and rear ends of the PE anti-static and flame-retardant black grouting pipe are each provided with 4 8mm grouting holes, the middle section of the PE anti-static and flame-retardant black grouting pipe is provided with 1-2 internal expansion and bursting valve grouting holes, and the rear end of the PE anti-static and flame-retardant black grouting pipe is locked with a grouting quick-plug connector; The return slurry filter pipe is provided with an external pressure bursting valve return slurry hole, dense small holes and a filter cloth tube; the front ends of the PE anti-static and flame-retardant black grouting pipe and the return slurry filter pipe are plugged with rubber plugs; the gas extraction pipe is set through the middle of the double-layer filter bag.

2. A pressure grouting water filtration and grouting sealing device as claimed in claim 1, characterized in that: The double-layer filter bag, return slurry filter pipe and PE anti-static and flame-retardant black grouting pipe are all locked and fixed by aluminum alloy pipe clamps.

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