Double-hole pipe water filtering and slurry returning hole packer

Abstract

The invention discloses a double-hole-pipe water filtering and slurry returning hole packer, and particularly belongs to the field of coal mine equipment. The hole packer comprises a double-hole PE pipe with the diameter of 20 mm, the double-hole PE pipe is perforated in the front-back direction and sleeved with bags, after an aluminum alloy pipe is hooped, the two double-layer bags are fastened to the double-hole pipe through a hydraulic tightening machine, and then a middle section is perforated to be assembled with an explosion valve and sleeved with a filter cloth cylinder to filter cement paste, so that protection is provided. After a blasting valve is arranged on the filter hole pipe sleeved with the filter cloth cylinder to filter out most of water in slurry in the hole, the blasting valve crushes blasting valve on the filter hole pipe under the grouting pressure of about 1.0-1.6 MPa to feed slurry, high-concentration cement slurry returns along filtered water and is discharged out of the drill hole, and the grouting and hole sealing work can be completed; according to the method, the concentration of the cement grout injected into the drill hole is improved, solid hole sealing is achieved, the solidification time is shortened, the phenomena that the cement grout in the middle section is slow in solidification and the grout shrinks after being dried, and a semi-hollow phenomenon occurs are avoided, and therefore the purposes of improving the grout concentration and improving the hole sealing quality of the drill hole are achieved.

Description

Technical Field

[0001] The invention relates to the field of coal mine equipment, and in particular to a double-hole pipe water filtration and slurry return hole sealing device. Background Art

[0002] At present, most coal mines cannot effectively extract gas from coal seams because the concentration of drilling grouting cannot be increased and the secondary pressure sealing cannot be performed. As a result, the gas drilling is not tightly sealed and the gas in the coal seam cannot be effectively extracted. This results in a low concentration of gas extracted from the drilling, resulting in a low concentration of gas extracted by the gas extraction pump, a long extraction time, a loss caused by mining imbalance, and a failure to take over the coal mining face, and the recovered gas concentration is low, which is difficult to meet the concentration requirements of gas power generation. 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 double-hole pipe water filtration and slurry sealing device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a double-hole pipe-belt water pressure filter sealer which can filter out water in the slurry, increase the slurry concentration in the borehole, and then break the bursting valve on the water filter pipe to return slurry to the outside of the hole, with low sealing cost, good sealing performance, high safety factor and high working efficiency.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: A double-hole pipe water filter and return grout sealing device comprises a PE anti-static flame-retardant double-hole pipe with a diameter of 20mm, one side of the PE anti-static flame-retardant double-hole pipe is a grouting pipe, and the other side of the PE anti-static flame-retardant double-hole pipe is a slurry outlet filter and return water pipe; the front and rear ends of the PE anti-static flame-retardant double-hole pipe are both set and fastened on two bags with a diameter of 120mm-200m and a length of 700mm-1000mm; 3-5 8mm grouting holes are respectively punched in the front and rear bags of the grouting pipe, and two slurry inlet holes are punched on the water filter and return grouting pipe 10mm behind the bag; a section of PVC hose with a diameter of 20mm and a length of 10mm is set on the PE anti-static flame-retardant double-hole pipe, and an external pressure bursting valve return grouting hole is made by pressing and fastening with an aluminum ring; two slurry outlet holes are punched side by side on the grouting pipe between the two bags, and a section of PVC hose is set and fastened to make an internal pressure fracturing valve grouting hole; The front end of the PE anti-static and flame-retardant double-hole pipe is plugged with a rubber plug, and a section of the front end is extended to use a rubber plug and an aluminum alloy pipe clamp to seal the outlet about 100mm for easy bundling to the extraction pipe; the internal pressure burst valve grouting hole and the double-hole pipe are both aluminum alloy pipe clamps that are tightly fixed to the double-hole pipe with a pipe locking machine with high compression; dense 6mm water filter holes with an interval of 5mm are drilled within the range of the water filter cloth sleeve, and the two ends of the water filter cloth sleeve are fixed to the PE double-hole pipe with aluminum alloy pipe clamps.

[0006] Specifically, a double-hole pipe water filter and slurry sealer as described in claim 1 is characterized in that the bag can be made of thickened flame-retardant polyester cloth, canvas, Oxford cloth, filter cloth, cotton cloth, and bags of different sizes with a diameter of 120mm to 200mm and a length of 700mm to 1000mm can be used according to the size requirements of the coal mine gas drilling hole.

[0007] The beneficial effects of the present invention are: This application is mainly used for sealing gas boreholes in coal mines, and can increase the concentration of sealing slurry to achieve solid core sealing. While the grouting liquid is filtered out and discharged, the high-concentration slurry remaining in the borehole is continuously squeezed into the surrounding coal-rock gaps in the borehole under the pressure of the grouting pump to block the leakage channel. The filling of cement slurry strengthens the stability of the coal-rock layer, improves the support of the tunnel, prevents tunnel deformation, prevents coal seam spontaneous combustion, prevents impact ground pressure, and prevents the possibility of convexity from the tunnel roof and coal and gas outbursts. The present application first injects grout from a side hole tube to the front and rear two double-layer bags when the expansion pressure reaches 1.0MPa~1.6MPa. The grouting pressure increases and the grouting holes of the internal pressure burst valve arranged in the middle section are successively opened to inject grout into the middle section of the two bags 1. During the continuous grouting, the excess water is filtered out of the borehole through the grouting pressure from the water filter return pipe in the middle section, thereby increasing the concentration of the cement slurry injected in the borehole to achieve solid core sealing and accelerate the solidification time, avoiding the slow solidification of the cement slurry in the middle section and the shrinkage of the slurry after drying, thereby achieving the purpose of increasing the slurry concentration and improving the quality of borehole sealing.

[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 double-hole pipe water filtration reverse slurry sealing device provided by the present invention; Explanation of the accompanying reference numerals: 1. Bag; 2. PE anti-static and flame-retardant double-hole pipe; 3. Grouting hole; 4. Slurry inlet hole; 5. Grouting hole for internal pressure bursting valve; 6. Slurry return hole for external pressure bursting valve; 7. Rubber plug; 8. Aluminum alloy pipe clamp; 9. Extraction tube; 10. Water filter cloth sleeve; 11. Water filter hole; 12. Slurry inlet direction; 13. Water return hole; 14. Hole plug. 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 double-hole pipe water filter and return grout sealing device, comprising a PE anti-static flame-retardant double-hole pipe 2 with a diameter of 20mm, one side of the PE anti-static flame-retardant double-hole pipe 2 is a grouting pipe, and the other side of the grouting filter and return water pipe is a grouting pipe; the front and rear ends of the double-hole pipe are both set and fastened on two bags 1 with a diameter of 120mm-200mm and a length of 700mm-1000mm; 3-5 8mm grouting holes 3 are respectively punched in the front and rear bags 1 of the grouting pipe, and two grouting holes 4 are punched on the water filter and return grouting pipe 10mm behind the bag 1; a section of 20mm diameter and 10mm long PVC hose is set on the double-hole pipe, and an external pressure bursting valve return grouting hole 6 is made by pressing and fastening with an aluminum ring, and two grouting holes are punched side by side on the grouting pipe between the two bags 1 and a section of PVC hose is set and fastened to make an internal pressure fracturing valve grouting hole 5; A rubber plug 7 is plugged at the front end of the double-hole pipe to prevent the slurry from flowing from the front end; and a section of the front end is extended to be compressed and sealed with a rubber plug 7 and an aluminum alloy pipe clamp 8 for about 100 mm of the outlet for easy bundling with the extraction pipe 9. The internal pressure bursting valve grouting hole and the double-hole pipe are both aluminum alloy pipe clamps 8 that are tightly fixed to the double-hole pipe with a pipe locking machine; when the pressure of the internal pressure bursting valve grouting hole in the middle section reaches the bursting value of the internal pressure bursting valve grouting hole of 1.0 to 1.6, the internal pressure bursting valve grouting hole bursts the slurry and starts grouting the middle section, and densely drills water filter holes 11 with an interval of 5 mm to 6 mm within the range of the water filter cloth sleeve 10, and the two ends of the water filter cloth sleeve 10 are fixed on the PE double-hole pipe with aluminum alloy pipe clamps 8; Specifically, the bag 1 can be made of thickened flame-retardant polyester cloth, canvas, Oxford cloth, filter cloth, cotton cloth, etc., and can be made of bags 1 of different sizes with a diameter of 120mm to 200mm and a length of 700mm to 1000mm according to the size requirements of the coal mine gas drilling hole.

[0015] When in use, the present application is tied to the extraction pipe 9, which is inserted into the borehole and a reserved pipe more than 1 meter at the tail end is left to connect the grouting pipe on the grouting pump and turn on the grouting pump to grout. When the slurry enters the front and rear end bags 1 of the sealer, part of the water is filtered out during grouting filling. The slurry expands and seals the front and rear bags 1 in succession to block the front and rear ends of the sealing section. When the grouting pressure reaches or exceeds 1.0-1.6MP, the internal pressure bursting valve grouting hole of the PVC hose in the middle section bursts and grouting is injected into the middle section. When the internal pressure bursting valve grouting hole in the middle section bursts, the pressure gauge on the grouting pump will drop from about 1.0-1.6MPa to about 0-0.1MPa. As the grouting pump continues to grout the middle section and the pressure continues to rise again, due to the boreholes at the front and rear ends being blocked, the pressure The bag 1 after the previous grouting is expanded and sealed to ensure that the grouting liquid in the middle section of the borehole will not leak to both ends when filling, thereby ensuring that the grouting liquid in the middle section of the borehole can be grouted in the middle section, and a large amount of water and air are squeezed out by the grouting pressure, so that the slurry concentration is improved, and the 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 to the outside; when the grouting pressure reaches 1.0-1.6MPa and the clean water flowing out of the filter water return slurry pipe hole is reduced, the explosion on the filter water return slurry pipe 10mm behind the bottom bag 1 will be squeezed by the slurry continuously injected by the grouting pump, and the injected slurry will flow out of the borehole along the filter water return slurry pipe, and the pump can be stopped to complete the grouting and sealing work.

[0016] In summary, this application is mainly used for sealing gas boreholes in coal mines, and can increase the concentration of sealing slurry to achieve solid core sealing. While the grouting liquid is filtered out and discharged, the high-concentration slurry remaining in the borehole is continuously squeezed into the surrounding coal-rock gaps in the borehole under the pressure of the grouting pump to block the leakage channel. The filling of cement slurry strengthens the stability of the coal-rock layer, improves the support of the tunnel, prevents tunnel deformation, prevents spontaneous combustion of coal seams, prevents impact ground pressure, and prevents the possibility of convex pressure from the tunnel roof and coal and gas outbursts. The present application first injects grout from the side hole tube to the front and rear two double-layer bags 1 when the expansion pressure reaches 1.0MPa~1.6MPa. The grouting pressure increases and the grouting holes of the internal pressure burst valve arranged in the middle section are successively opened to inject grout into the middle section of the two bags 1. During the continuous grouting, the excess water is filtered out of the borehole through the grouting pressure from the water filter return pipe in the middle section, thereby increasing the concentration of the cement slurry injected in the borehole to achieve solid core sealing and accelerate the solidification time, avoiding the semi-hollow core phenomenon caused by the slow solidification of the cement slurry in the middle section and the shrinkage of the slurry after drying, thereby achieving the purpose of increasing the slurry concentration and improving the quality of borehole sealing.

[0017] 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.

[0018] 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 double-hole pipe water filtration and slurry sealing device, characterized in that: It comprises a PE anti-static flame-retardant double-hole pipe with a diameter of 20mm, one side of the PE anti-static flame-retardant double-hole pipe is a grouting pipe, and the other side of the PE anti-static flame-retardant double-hole pipe is a slurry outlet filter return water pipe; the front and rear ends of the PE anti-static flame-retardant double-hole pipe are both set and fastened on two bags with a diameter of 120mm-200m and a length of 700mm-1000mm; 3-5 8mm grouting holes are punched in the front and rear bags of the grouting pipe, and two slurry inlet holes are punched on the water filter return slurry pipe 10mm behind the bag; a section of 20mm diameter and 10mm long PVC hose is set on the PE anti-static flame-retardant double-hole pipe, and an external pressure bursting valve return slurry hole is made by pressing and fastening with an aluminum ring; two slurry outlet holes are punched side by side on the grouting pipe between the two bags, and a section of PVC hose is set and fastened to make an internal pressure fracturing valve grouting hole; The front end of the PE anti-static and flame-retardant double-hole pipe is plugged with a rubber plug, and a section of the front end is extended to use a rubber plug and an aluminum alloy pipe clamp to seal the outlet about 100mm for easy bundling to the extraction pipe; the internal pressure burst valve grouting hole and the double-hole pipe are both aluminum alloy pipe clamps that are tightly fixed to the double-hole pipe with a pipe locking machine with high compression; dense 6mm water filter holes with an interval of 5mm are drilled within the range of the water filter cloth sleeve, and the two ends of the water filter cloth sleeve are fixed to the PE double-hole pipe with aluminum alloy pipe clamps.

2. A double-hole pipe water filtration and slurry sealing device as claimed in claim 1, characterized in that: The bag can be made of thickened flame-retardant polyester cloth, canvas, Oxford cloth, filter cloth, cotton cloth, and can be made of bags of different sizes with a diameter of 120mm to 200mm and a length of 700mm to 1000mm according to the size requirements of the coal mine gas drilling hole.

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