Coal mine ground drill hole sealing structure

Abstract

The utility model relates to the technical field of gas extraction, in particular to a coal mine ground drill hole sealing structure. Comprising a vertical pipe, an inflatable air bag, a bottom supporting plate and a sealing plug. The vertical pipe is arranged on the inner side of the hole, and the upper end of the vertical pipe is connected with the limiting support. An inflation tube is arranged on the inflation air bag in a communicating manner; the bottom supporting plate is arranged at the bottom end of the vertical pipe and is of an annular plate-shaped structure. The sealing plug is in clearance fit with the inner side of the vertical pipe, a push rod is connected to the sealing plug, and a limiting ring is arranged at the bottom end of the inner wall of the vertical pipe. According to the technical scheme, the bottom supporting plate is arranged to support the concrete, so that the effect of preventing the inflatable air bag from greatly deforming can be achieved, and the sealing effect of the inflatable air bag is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas extraction technical field especially relates to a coal mine ground drilling hole sealing structure. BACKGROUND

[0002] The hole sealing is an important technology in the coal mine gas drainage drilling, and the sealing property of the drilling directly affects the extraction effect, the hole sealing process includes the cement mortar hole sealing method, the wooden wedge yellow mud hole sealing method, the polyurethane foam hole sealing method and the synthetic resin and cement slurry pressure grouting, the cement mortar hole sealing method adopts the cement hole sealing pump to hit the cement mortar into several meters deep, plays the sealing action after the cement solidification, the advantages of the cement hole sealing method are that the cost is lower and the material is easy to obtain, however, the cement hole sealing method has three defects, first, the material solidification time is long, and the gap is formed before completely solidifying.

[0003] The patent with the publication number CN209067159U discloses a coal mine gas extraction drilling hole sealing structure and relates to the technical field of coal mine gas extraction, which comprises a gas extraction pipe and a filling machine, the inside of the gas extraction pipe is provided with cement mortar, one side of the inside of the cement mortar is movably installed with a first fixing rod, the other side of the inside of the cement mortar is movably installed with a second fixing rod, the inside of the first fixing rod is movably installed with an air pipe, and one end of the air pipe is fixedly connected with an air nozzle.

[0004] The patent still has the following technical defects: when filling the concrete, if the single concrete filling amount is large or the filling is uneven (the material is poured into the inside of the hole at a fixed position), the air bag will deform, thereby reducing the sealing performance of the air bag and easily causing the leakage of the concrete. UTILITY MODEL CONTENTS

[0005] The utility model aims at the problems in the background art and provides a coal mine ground drilling hole sealing structure.

[0006] The technical scheme of the utility model relates to a coal mine ground drilling hole sealing structure, which comprises:

[0007] The vertical pipe is arranged on the inside of the hole, and the upper end of the vertical pipe is connected with a limiting support;

[0008] The inflatable air bag is provided with an inflation pipe in communication;

[0009] The bottom supporting plate is arranged at the bottom end of the vertical pipe, and the bottom supporting plate is an annular plate structure;

[0010] The sealing plug is in clearance fit with the inside of the vertical pipe, the sealing plug is connected with a push rod, and the inner wall of the vertical pipe is provided with a limiting ring at the bottom end.

[0011] Preferably, the limiting support comprises a plurality of limiting rods connected to the upper end of the vertical pipe, the plurality of limiting rods are arranged in a circular array, and outer ends of the limiting rods are arranged outside the edge of the hole; a limiting block is connected to each of the plurality of limiting rods, and the plurality of limiting blocks are in contact with the inner wall of the hole.

[0012] Preferably, a gap exists between the bottom supporting plate and the inner wall of the hole.

[0013] Preferably, the upper end of the inflation pipe is provided with a cover plate, and the cover plate has a T-shaped structure in cross section.

[0014] Preferably, when the cover plate is buckled on the upper end of the vertical pipe, the top end of the inflatable air bag is located above the inner bottom end of the vertical pipe.

[0015] Preferably, the diameter of the inflation pipe is smaller than the inner diameter of the limiting ring.

[0016] Compared with the prior art, the utility model has the beneficial technical effects that:

[0017] 1. By arranging the inflatable air bag at the inner bottom end of the hole, the continuous downward flow of the concrete before solidification is prevented, and the gap between the concrete and the hole is avoided, so that the plugging effect of the hole is improved.

[0018] 2. The bottom supporting plate can bear most of the weight of the concrete, and prevent the concrete from causing a large deformation of the inflatable air bag, so that the sealing effect of the inflatable air bag is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model before pouring concrete.

[0020] Figure 2 It is a structural schematic view of the utility model after pouring concrete.

[0021] Figure 3 It is a sectional view of the utility model before pouring concrete.

[0022] Figure 4 It is a sectional view of the utility model after pouring concrete.

[0023] Reference signs: 1, hole; 2, vertical pipe; 3, inflatable air bag; 4, bottom supporting plate; 5, limiting rod; 51, limiting block; 6, inflation pipe; 7, cover plate; 8, limiting ring; 91, outer concrete block; 92, inner concrete block; 10, sealing plug; 11, push rod. DETAILED DESCRIPTION

[0024] Example one

[0025] As Figures 1-4The coal mine ground drilling hole sealing structure provided by the embodiment comprises a vertical pipe 2, an inflatable air bag 3, a bottom supporting plate 4 and a sealing plug 10.

[0026] The vertical pipe 2 is arranged at the inner side of the hole 1, and the upper end of the vertical pipe 2 is connected with a limiting support; the inflatable air bag 3 is connected with an inflation pipe 6, the upper end of the inflation pipe 6 is provided with a cover plate 7, the cross section of the cover plate 7 is a T-shaped structure; after the cover plate 7 is buckled on the upper end of the vertical pipe 2, the top end of the inflatable air bag 3 is located above the inner bottom end of the vertical pipe 2, and the cover plate 7 is arranged for limiting the inflation pipe 6; the diameter of the inflation pipe 6 is smaller than the inner diameter of the limiting ring 8, so that the inflation pipe 6 can smoothly pass through the inner side of the vertical pipe 2.

[0027] The bottom supporting plate 4 is arranged at the bottom end of the vertical pipe 2, and the bottom supporting plate 4 is an annular plate structure, and there is a gap between the bottom supporting plate 4 and the inner wall of the hole 1, so that a small amount of concrete flows into the upper side of the vertical pipe 2 through the gap.

[0028] The sealing plug 10 is matched with the gap at the inner side of the vertical pipe 2, the sealing plug 10 is connected with a push rod 11, and the inner wall bottom end of the vertical pipe 2 is provided with the limiting ring 8.

[0029] Specifically, before the inner side of the hole 1 is sealed, the inflation pipe 6 is inserted into the inner side of the vertical pipe 2, so that the deflated inflatable air bag 3 is arranged on the side away from the limiting support, and further, in order to facilitate the separation work of the inflatable air bag 3 and the concrete, a release agent is coated on the surface of the inflatable air bag 3 in advance, then the upper end of the vertical pipe 2 is sealed by the cover plate 7, the vertical pipe 2 is arranged at the inner side of the hole 1 and coaxially arranged with the hole 1, the bottom supporting plate 4 is moved to the limiting position, one end of the inflation pipe 6 is connected to the output end of the air pump, the air pump works to inflate the inside of the inflatable air bag 3, so that the inflatable air bag 3 is inflated until the peripheral side of the inflatable air bag 3 is tightly abutted against the inner wall of the hole 1, and then the inflation work is stopped; after the preliminary preparation work is completed, the pouring work is carried out.

[0030] The specific pouring process is as follows: first, the concrete is poured into the cavity between the vertical pipe 2 and the hole 1, in order to ensure the pouring effect, the vibration rod is placed on the inner side of the hole 1, the concrete can be vibrated, the concrete in the gap around the bottom supporting plate 4 flows downward to the bottom supporting plate 4 and the inflatable air bag 3, because the inflatable air bag 3 is arranged, the concrete cannot continue to flow downward, the poured concrete forms the outer concrete block 91, the bottom supporting plate 4 arranged can support most of the weight of the outer concrete block 91, because the inflatable air bag 3 is below the bottom supporting plate 4, the weight borne by the inflatable air bag 3 is small, therefore, the deformation degree of the inflatable air bag 3 caused by the concrete is small, so as to ensure the sealing effect of the inflatable air bag 3; after the outer concrete block 91 solidifies, the gas in the inflatable air bag 3 is released, then the inflatable tube 6 is pulled outward to drive the inflatable air bag 3 to move, so that the inflatable air bag 3 moves out of the inner side of the hole 1, thereby achieving the purpose of recycling the inflatable air bag 3; after the sealing plug 10 is inserted into the inner bottom end of the vertical pipe 2, the concrete is poured into the vertical pipe 2, and the poured concrete forms the inner concrete block 92 after drying.

[0031] In summary, the technical scheme can improve the sealing effect of the inner side of the hole 1, prevent the concrete from continuing to flow downward before solidification, avoid the gap between the concrete and the hole 1, and improve the plugging effect of the hole 1.

[0032] Embodiment two

[0033] As shown in Figure 1 and Figure 2 , the coal mine ground drilling hole sealing structure provided by the embodiment, compared with the first embodiment, the limiting support includes a plurality of limiting rods 5 connected with the upper end of the vertical pipe 2, the plurality of limiting rods 5 are arranged in an annular array, and the outer ends of the limiting rods 5 are arranged outside the edge of the hole 1; a limiting block 51 is connected to each of the plurality of limiting rods 5, and the plurality of limiting blocks 51 are in contact with the inner wall of the hole 1; the limiting support can limit the vertical pipe 2, preventing the vertical pipe 2 from continuing to move downward, in order to improve the stability of the installation of the limiting support, a through hole is formed in the outer end of the limiting support, and the operator further fixes the limiting support by passing the pin through the through hole; the limiting support can limit the vertical pipe 2, preventing the concrete from continuing to slide downward due to gravity.

[0034] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to this, within the scope of knowledge possessed by the person skilled in the art, various changes can be made without departing from the purpose of the utility model.

Claims

1. A coal mine surface borehole sealing structure, characterised in that, The utility model relates to a kind of hole filling device, including: Vertical pipe (2), vertical pipe (2) is arranged in the inside of hole (1), and the upper end of vertical pipe (2) is connected with limiting support; Inflatable air bag (3), inflatable air bag (3) is connected with inflation pipe (6) in the upper side; Bottom supporting plate (4), bottom supporting plate (4) is arranged in the bottom end of vertical pipe (2), and bottom supporting plate (4) is annular plate structure; Sealing plug (10), sealing plug (10) is matched with the inside gap of vertical pipe (2), and sealing plug (10) is connected with push rod (11) on the upper side, and the inner wall bottom end of vertical pipe (2) is provided with limiting ring (8).

2. The coal mine surface borehole sealing structure according to claim 1, characterized in that, Limiting support includes multiple limiting rods (5) connected with the upper end of vertical pipe (2), and multiple limiting rods (5) are arranged in annular array distribution, and the outer end of limiting rod (5) is arranged outside the edge of hole (1);Multiple limiting rods (5) are all connected with limiting block (51), and multiple limiting blocks (51) are all in contact with the inner wall of hole (1).

3. The coal mine surface borehole sealing structure according to claim 1, characterized in that, There is gap between bottom supporting plate (4) and the inner wall of hole (1).

4. The coal mine surface borehole sealing structure according to claim 1, characterized in that, The upper end of inflation pipe (6) is provided with cover plate (7), and the section of cover plate (7) is the structure of "T” type.

5. A coal mine surface borehole sealing structure according to claim 4, characterised in that, After cover plate (7) is buckled on the upper end of vertical pipe (2), the top end of inflatable air bag (3) is located above the inside bottom end of vertical pipe (2).

6. The coal mine surface borehole sealing structure according to claim 4, characterized in that, The diameter of inflation pipe (6) is less than the inner diameter of limiting ring (8).

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