Pressure grouting, water filtering and slurry returning hole packer

Abstract

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

[0002] At present, due to the backward sealing technology of coal mine coal seam gas extraction holes, most coal mine gas drilling holes are not tightly sealed, resulting in serious gas leakage. The coal mine tunnels are filled with gas, causing safety hazards, resulting in low gas concentration extracted by gas extraction pumps, long extraction time, mining imbalance, and failure to take over the coal mining face, resulting in large losses. In addition, the recovered gas concentration is low and it is difficult to meet the gas power generation concentration requirements. In addition, the sealing time is long, the work efficiency is low, and the overall cost is high.

[0003] Therefore, it is necessary to develop a pressure grouting water filtration and grouting sealer to solve the above problems. Summary of the invention

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

[0005] In order to achieve the above object, the present invention provides the following technical solutions: A pressure grouting water filtering and return grouting hole sealing device, comprising two double-layer filter bags, a PE anti-static flame-retardant black grouting pipe, a return grouting water filtering 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 flame-retardant black grouting pipe, the front and rear ends of the PE anti-static flame-retardant black grouting pipe are respectively provided with 4 8mm grouting holes, the middle section of the PE anti-static flame-retardant black grouting pipe is provided with 1-2 internal expansion burst valve grouting holes, and the rear end of the PE anti-static 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 arranged through the middle of the double-layer filter bag.

[0006] 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.

[0007] The beneficial effects of the present invention are: This application can filter out excess water and air, avoid excess water and air remaining in the hole and causing semi-hollowing phenomenon after drying, leaving viscous high-concentration cement slurry in the borehole and filling and sealing the borehole, and can squeeze and fill the coal-rock gaps around the borehole to plug leaks; it meets the safety operation of coal mines, surpasses any gas sealing products used in coal mines today, and greatly improves the concentration of coal seam gas extraction. It has the advantages of low sealing cost, low labor intensity, reduced staff, improved sealing quality, flexible sealing length and high safety factor.

[0008] 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 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

[0009] Figure 1 A schematic diagram of the structure of the pressure grouting water filtration and grouting hole sealer provided by the present invention; Explanation of the accompanying reference numerals: 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 cylinder; 11. Rubber plug; 12. Aluminum alloy pipe clamp. DETAILED DESCRIPTION

[0010] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0012] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0013] 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.

[0014] See also Figure 1 The present invention provides a pressure grouting water filtering and return grouting hole sealing device, comprising two double-layer filter bags 1, a PE anti-static flame retardant black grouting pipe 2, a return grouting water filtering 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 flame retardant black grouting pipe, the front and rear ends of the PE anti-static flame retardant black grouting pipe are respectively provided with 4 8mm grouting holes 5, the middle section of the PE anti-static flame retardant black grouting pipe is provided with 1-2 internal expansion burst valve grouting holes 6, and the rear end of the PE anti-static flame retardant black grouting pipe is locked with a grouting quick plug connector 7; 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; and a gas extraction pipe is arranged through the middle of the double-layer filter bag.

[0015] 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 the aluminum alloy pipe clamp 12.

[0016] Specifically, the grouting filter pipe with dense small holes and a filter cloth can discharge the air in the hole during grouting, filter out the excess water to increase the grout concentration, and then the bursting valve is crushed under the grouting high pressure to achieve the purpose of pressurized grouting, water filtering, and grouting. The concentration of the cement slurry injected in the hole is increased to achieve the purpose of solid core sealing and avoid the phenomenon of semi-hollow core after the cement slurry in the middle section dries.

[0017] Specifically, two 8mm slurry outlet 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 made of a section of PVC hose with a diameter of 20mm and a length of 120mm with a pinhole can ensure that when the middle section is filled with slurry to seal the borehole and surrounding coal seam cracks, the grouting pressure reaches about 1.0-1.5MPa, and the external pressure bursting valve return slurry hole can be effectively broken to return slurry out, 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.

[0018] Specifically, the front and rear double-layer filter bags of the present 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 the customer.

[0019] When in use, after the underground hole is drilled, the present application is tied to the extraction and sealing tube, inserted into the drill hole, and the tail end is left to lock the quick-plug connector to connect the grouting tube 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 application and expands and seals the front and rear double-layer filter bags during grouting. When the grouting pressure reaches or exceeds 1.0-2MP, 1-2 grouting holes of the external pressure bursting valve on the middle section PE anti-static and flame-retardant black grouting tube are broken under pressure to inject grouting into the middle section; when the grouting hole of the external pressure bursting valve bursts, the pressure gauge on the grouting pump will increase from 1.0-1.6MPa When the pressure drops to 0-0.1MPa, the grouting pump continues to grout and the pressure gauge slowly rises. A large amount of water is filtered out through the grouting pressure and discharged from the grouting filter pipe, so that the cement slurry concentration in the grouting hole of the external pressure bursting valve is increased, and the high-concentration cement slurry continuously penetrates into the gaps around the coal rock in the borehole to block the leakage channel and prevent the possibility of gas leakage. When the grouting pressure in the middle section reaches 1.0MPa-1.5MPa, the grouting hole of the external pressure bursting valve is broken by the grouting pressure, and the high-concentration cement slurry flows out of the borehole along the filter grouting pipe, and the grouting sealing work is completed. At this time, the entire sealing section and the surrounding coal rock gaps have been completely filled with high-concentration cement slurry.

[0020] In summary, this application can filter out excess water and air, avoid excess water and air remaining in the hole and causing semi-hollowing phenomenon after drying, leaving viscous high-concentration cement slurry in the borehole and filling and sealing the borehole, and can squeeze and fill the coal-rock gaps around the borehole for the purpose of plugging leaks; it meets the safety operation of coal mines, surpasses any gas sealing products used in coal mines today, and greatly improves the concentration of coal seam gas extraction. It has the advantages of low sealing cost, low labor intensity, reduced staff, improved sealing quality, flexible sealing length and high safety factor.

[0021] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0022] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pressure grouting water filtration and grouting hole sealing device, characterized in that: It includes two double-layer filter bags, a PE anti-static 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 flame-retardant black grouting pipe, and the front and rear double-layer filter bags of the PE anti-static flame-retardant black grouting pipe are respectively provided with 4 8mm grouting holes, the middle section of the PE anti-static flame-retardant black grouting pipe is provided with 1-2 internal expansion burst valve grouting holes, and the rear end of the PE anti-static 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 arranged 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, 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.

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