Sealing device special for repairing, plugging and grouting of sealed drill hole crack and using method of sealing device

Abstract

The sealing device comprises a rectangular flat bag body, the left side of the bag body is connected with an in-bag grouting pipe, a crack grouting pipe is arranged in the bag body in a penetrating mode in the left-right direction, and the left end opening and the right end opening of the crack grouting pipe are both located outside the bag body; one side face of the bag body front portion and the other side face of the bag body rear portion are connected through a first bonding structure to form a cylindrical structure with a center hole. The hole sealing bag body made of the elastic cloth wound on the extraction pipe is used, normal proceeding of gas extraction operation is not affected during hole sealing, the structure is extremely simple, the machining cost is low, operation is convenient, on the basis of conventional hole sealing, the hole sealing bag can be flexibly used only when the drill hole repairing requirement exists, a drill hole with the good extraction effect does not need to be used, and use is convenient. The labor cost and the material acquisition cost can be reduced, and the economic value is remarkable. The hole sealing device can replace a bag to be used for sealing holes for the first time.

Description

Technical Field

[0001] The invention belongs to the technical field of repairing and plugging cracks in surrounding rocks of underground coal mine boreholes, and in particular relates to a special sealing device for repairing and plugging grouting of sealed borehole cracks and a use method thereof. Background Art

[0002] The existing traditional borehole sealing equipment and methods can generally only seal the borehole, but cannot deal with the cracks developed around the borehole, resulting in gas leakage during the gas extraction process. In order to repair the crack leakage of the blocked borehole, a series of plugging holes must be drilled around the borehole for grouting and plugging, which is an extremely complicated process. In recent years, many domestic scholars and engineers have invented crack plugging and hole sealing equipment, which mostly use multiple bag sealing equipment, such as: three-bag plugger, etc., which have achieved good crack plugging and gas extraction effects, but this type of sealing equipment has a complex structure and high production and procurement costs; and more importantly, not all extraction boreholes will have problems with surrounding rock cracks and rapid decline in extraction concentration. Summary of the invention

[0003] In order to solve the above technical problems existing in the prior art, the present invention provides a special sealing device for repairing and plugging grouting of sealed drilled holes for gas extraction, which has simple structure, convenient operation, low cost and good sealing effect, and a method for using the same.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a special sealing device for repairing and plugging grouting of sealed drilled cracks, comprising a rectangular flat bag body, a grouting pipe inside the bag is connected to the left side of the bag body, a crack grouting pipe is penetrated through the bag body along the left and right directions, the left and right ends of the crack grouting pipe are both outside the bag body, and a side surface of the front of the bag body and the other side surface of the rear of the bag body are connected by a first bonding structure to form a cylindrical structure with a central hole.

[0005] The bag also includes a rectangular safety wrap layer, which is equal in size to the bag body in the left and right directions, the front side or the rear side of the safety wrap layer is connected to the middle of the bag body, the safety wrap layer is rolled around the bag body into an outer circle of a cylindrical structure, and one side of the front of the safety wrap layer is connected to the other side of the rear of the safety wrap layer by a second adhesive structure.

[0006] The bag body and the safety wrapping layer are made of air-permeable, water-permeable, and starch-impermeable elastic fabric. The elastic fabric is made of elastic nylon fabric or cord fabric. The bag body is a double-layer elastic fabric with four internal sides sealed and connected and a cavity. The safety wrapping layer is a single-layer elastic fabric.

[0007] The first bonding structure adopts a strip-shaped Velcro tape having a first barbed surface and a first plush surface.

[0008] The second bonding structures all use strip-shaped Velcro tapes with a second barbed surface and a second plush surface.

[0009] The method for using the special sealing equipment for repairing and plugging grouting of sealed drilled holes and fissures includes the following steps: S1: Wrapping a rectangular flat bag body around the extraction tube of the sealed borehole outside the borehole, so that the first hook surface and the first plush surface are bonded, so that the rectangular flat bag body forms a cylindrical structure; S2: Connect the left end of the grouting pipe in the bag to the external grouting pipe, and connect the fracture grouting pipe to the external fracture grouting pipe; S3: Wrapping the safety wrapping layer around the outer periphery of the cylindrical bag body, and bonding the second barbed surface to the second plush surface; S4: Move the cylindrical bag body and the safety wrapping layer to the right along the extraction pipe to the inside of the borehole, and stop when the bag body is 5 to 100 cm away from the bag sealer that has sealed the borehole; S5: Grouting is performed into the cylindrical bag body through the external grouting pipe and the inner grouting pipe. The grouting pressure is between 0.5 and 2 MPa. The bag body expands and water seeps outward from the bag body, driving the externally wrapped safety wrapping layer to expand radially, so that the outer circle of the safety wrapping layer is closely attached to the borehole wall to form a cylindrical stone body, until the bag body no longer seeps water, that is, the slurry blocks the gap of the elastic fabric, and grouting into the bag body is stopped, and the first grouting valve at the left end of the inner grouting pipe is closed; S6: Grouting is performed into the space between the cylindrical stone body and the existing bag sealer through the external fracture grouting pipe and the fracture grouting pipe. The grouting pressure is between 0.5 and 2 MPa. The injected slurry is gel or mucus to fill the leaking fractures on the inner wall of the borehole. After the grouting pressure is maintained for 30-60 minutes, the grouting is stopped and the second grouting valve at the left end of the fracture grouting pipe is closed.

[0010] By adopting the above technical solution, compared with the prior art, the present invention has the following beneficial effects: (1) The safety wrapping layer in the present invention is wrapped around the outside of the bag body, and the two strip-shaped Velcro tapes are arranged symmetrically about the center line of the extraction tube. This can prevent the Velcro tapes from being opened after being stressed during the grouting expansion process in the bag body, thereby affecting the sealing effect with the borehole wall, and at the same time increase the strength of the bag body.

[0011] (2) The present invention uses a sealing bag body made of elastic fabric wound around the extraction pipe. When sealing the hole, it does not affect the normal progress of the gas extraction operation. It has an extremely simple structure, low processing cost, and convenient operation. On the basis of conventional hole sealing, it can be flexibly used only when there is a need for drilling repair. It is not necessary to use it for drillings with good extraction effects. It can also reduce labor costs and material purchase costs, and has significant economic value. The present invention can also replace the bladder bag as the first hole sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the bag body of the present invention being passed around the extraction tube; Figure 3 It is a schematic diagram of the present invention when grouting is performed after the sealing pipe is moved into the borehole. DETAILED DESCRIPTION

[0013] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0014] like Figure 1-Figure 3 As shown, the special sealing equipment for repairing and plugging grouting of sealed drilled cracks of the present invention comprises a rectangular flat bag body 1, an inner grouting pipe 2 is connected to the left side of the bag body 1, a crack grouting pipe 3 is penetrated through the bag body 1 along the left and right directions, the left and right ends of the crack grouting pipe 3 are both outside the bag body 1, and a side surface of the front of the bag body 1 and the other side surface of the rear of the bag body 1 are connected by a first adhesive structure 14 to form a cylindrical structure with a central hole.

[0015] The present invention also includes a rectangular safety wrap layer 4, which is equal in size to the bag body 1 in the left and right directions, and the front side or rear side of the safety wrap layer 4 is connected to the middle of the bag body 1. The safety wrap layer 4 is rolled around the bag body 1 into an outer circle of a cylindrical structure, and one side of the front of the safety wrap layer 4 is connected to the other side of the rear of the safety wrap layer 4 by a second adhesive structure.

[0016] The bag body 1 and the safety wrapping layer 4 are made of air-permeable, water-permeable, and starch-impermeable elastic fabrics, the elastic fabrics are elastic nylon fabrics or cord fabrics, the bag body 1 is a double-layer elastic fabric with four internal edges sealed and connected and having a cavity, and the safety wrapping layer 4 is a single-layer elastic fabric.

[0017] The first bonding structure 14 is a strip-shaped Velcro tape having a first barbed surface 5 and a first plush surface 6 .

[0018] The second bonding structures all use a strip-shaped Velcro tape having a second barbed surface 7 and a second plush surface 8 .

[0019] The method for using the special sealing equipment for repairing and plugging grouting of sealed drilled holes and fissures includes the following steps: S1: Wrapping the rectangular flat bag body 1 around the extraction tube 12 that has sealed the drill hole 9 outside the drill hole 9, so that the first hook surface 5 and the first plush surface 6 are bonded, so that the rectangular flat bag body 1 forms a cylindrical structure; S2: Connect the left end of the grouting pipe 2 in the bag to the external grouting pipe, and connect the fracture grouting pipe 3 to the external fracture grouting pipe 3; S3: Wrapping the safety wrapping layer 4 around the outer periphery of the cylindrical bag body 1, and bonding the second barbed surface 7 to the second plush surface 8; S4: Move the cylindrical bag body 1 and the safety wrapping layer 4 to the right along the extraction pipe 12 to the inside of the borehole 9, and stop when the bag body 1 moves 5 to 100 cm away from the bag sealer that has sealed the borehole 9; S5: Grouting is injected into the cylindrical bag body 1 through the external grouting pipe and the inner grouting pipe 2, with the grouting pressure between 0.5 and 2 MPa. The bag body 1 expands and water seeps outward from the bag body 1, driving the externally wrapped safety wrapping layer 4 to expand radially, so that the outer circle of the safety wrapping layer 4 is closely attached to the wall of the borehole 9, forming a cylindrical stone body, until the bag body 1 no longer seeps water, that is, the slurry blocks the gap of the elastic fabric, and the grouting into the bag body 1 is stopped, and the first grouting valve 10 at the left end of the inner grouting pipe 2 is closed; S6: Grouting is performed on the space between the cylindrical stone body and the existing bag sealer 13 through the external fracture grouting pipe 3 and the fracture grouting pipe 3. The grouting pressure is between 0.5 and 2 MPa. The injected slurry is gel or mucus to fill the leaking fractures on the inner wall of the borehole 9. After the grouting pressure is maintained for 30-60 minutes, the grouting is stopped and the second grouting valve 11 at the left end of the fracture grouting pipe 3 is closed.

[0020] The sealing device of the present invention can be installed and used without dismantling the extraction pipeline, breaking or drilling holes, and can achieve grouting and plugging of leaking cracks in the sealed drilled holes, thus having extremely significant economic value.

[0021] The above embodiments illustrate the basic principles and features of the present invention, but the above only illustrates the preferred embodiments of the present invention and is not limited to the embodiments. Under the inspiration of this patent, a person skilled in the art can make many forms of deformation and improvement without departing from the scope of protection of the present invention and the claims, which are all within the protection scope of the present invention. Therefore, the patent and protection scope of the present invention shall be subject to the attached claims.

Claims

1. Special sealing equipment for repairing and plugging grouting of sealed drilled holes, characterized by: It includes a rectangular flat bag body, with an inner grouting pipe connected to the left side of the bag body, a fracture grouting pipe passing through the inside of the bag body along the left-right direction, and the left and right ends of the fracture grouting pipe are both outside the bag body. One side surface of the front of the bag body and the other side surface of the rear of the bag body are connected by a first bonding structure to form a cylindrical structure with a central hole.

2. The sealing device for repairing and plugging the sealed borehole fissure according to claim 1 is characterized in that: The bag also includes a rectangular safety wrap layer, which is equal in size to the bag body in the left and right directions, the front side or the rear side of the safety wrap layer is connected to the middle of the bag body, the safety wrap layer is rolled around the bag body into an outer circle of a cylindrical structure, and one side of the front of the safety wrap layer is connected to the other side of the rear of the safety wrap layer by a second adhesive structure.

3. The sealing device for repairing and plugging the sealed borehole fissure according to claim 2 is characterized in that: The bag body and the safety wrapping layer are made of air-permeable, water-permeable, and starch-impermeable elastic fabric. The elastic fabric is made of elastic nylon fabric or cord fabric. The bag body is a double-layer elastic fabric with four internal sides sealed and connected and a cavity. The safety wrapping layer is a single-layer elastic fabric.

4. The sealing device for repairing and plugging the sealed borehole fissure according to claim 3 is characterized in that: The first bonding structure adopts a strip-shaped Velcro tape having a first barbed surface and a first plush surface.

5. The sealing device for repairing and plugging the sealed borehole fissure according to claim 4 is characterized in that: The second bonding structures all use strip-shaped Velcro tapes with a second barbed surface and a second plush surface.

6. The method for using the sealing device for repairing and plugging grouting of a sealed drilled hole fissure according to claim 5 is characterized in that: The following steps are involved: S1: Wrapping a rectangular flat bag body around the extraction tube of the sealed borehole outside the borehole, so that the first hook surface and the first plush surface are bonded, so that the rectangular flat bag body forms a cylindrical structure; S2: Connect the left end of the grouting pipe in the bag to the external grouting pipe, and connect the fracture grouting pipe to the external fracture grouting pipe; S3: Wrapping the safety wrapping layer around the outer periphery of the cylindrical bag body, and bonding the second barbed surface to the second plush surface; S4: Move the cylindrical bag body and the safety wrapping layer to the right along the extraction pipe to the inside of the borehole, and stop when the bag body is 5 to 100 cm away from the bag sealer that has sealed the borehole; S5: Grouting is performed into the cylindrical bag body through the external grouting pipe and the inner grouting pipe. The grouting pressure is between 0.5 and 2 MPa. The bag body expands and water seeps outward from the bag body, driving the externally wrapped safety wrapping layer to expand radially, so that the outer circle of the safety wrapping layer is closely attached to the borehole wall to form a cylindrical stone body, until the bag body no longer seeps water, that is, the slurry blocks the gap of the elastic fabric, and grouting into the bag body is stopped, and the first grouting valve at the left end of the inner grouting pipe is closed; S6: Grouting is performed on the space between the cylindrical stone body and the existing bag sealer through the external fracture grouting pipe and the fracture grouting pipe. The grouting pressure is between 0.5 and 2 MPa. The injected slurry is gel or mucus to fill the leaking fractures on the inner wall of the borehole. After the grouting pressure is maintained for 30-60 minutes, the grouting is stopped and the second grouting valve at the left end of the fracture grouting pipe is closed.

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