CN105715230A - Middle slurry-permeating type single-bag grouting hole sealing device and hole sealing method thereof - Google Patents

Abstract

The central grouting type single-bag grouting sealing device and its sealing method, the central grouting single-bag grouting sealing device includes a recyclable grouting pipe, a grouting pipe joint, a front gas drainage pipe, a rear gas Extraction pipes, drainage devices, dual bore pipes, pressure control valves, expansion liners and expansion bladders. The recyclable grouting pipe communicates with the grouting channel of the double-hole pipe through the drainage device. When in use, the sealing device is placed on the front gas drainage pipe through the drainage device, and the recyclable grouting pipe is used to inject grout into the sealing device and expand. The bushing and expansion bag are inflated to seal the borehole after being filled with grout. The present invention can achieve more effective grouting sealing for the drilling of the sealing section, and better prevent the occurrence and development of air leakage cracks around the drilling of the sealing section, and also provides the grouting seal using the above-mentioned middle grouting type single bladder bag. The hole sealing method of the hole device, this method creates a high stress area around the hole in the hole sealing section, reduces the air permeability of the coal body around the hole in the hole sealing section, and realizes the purpose of effectively grouting and sealing the hole in the hole sealing section .

Description

Grouting and sealing device and sealing method for single-bag grouting in the middle

technical field

The invention belongs to the technical field of coal mine gas drainage drilling, and in particular relates to a central grout type single-bag grouting sealing device and a hole sealing method.

Background technique

In coal mines, the drilling depth of gas drainage in this coal seam is generally 50 meters or even hundreds of meters, and only a certain distance from the hole opening is sealed. It is difficult to seal by direct grouting except for inclined drilling. The sealing of drainage drilling is divided into permanent sealing and temporary sealing. At present, the known permanent sealing of drilling holes for gas drainage in this coal seam uses foamed polyurethane, foamed cement and other foaming materials as sealing materials. The early "cement roll sealing device" (ZL90227075.3) has been It is no longer used, and the direct drilling method of drilling is only suitable for inclined drilling. At present, foamed polyurethane materials are generally used to seal holes in China. At present, the temporary sealing of well-known gas drainage boreholes in coal mining face is sealed by a reusable mechanical sealing device, such as the patent name "underground gas drainage inflatable bag sealing device" (ZL94209078. 0), rubber sleeve expansion type "drilling and sealing device for coal and rock formations" (ZL200420010782.9), etc. At present, the patent titles are "bag type grouting sealing device and its sealing method" (ZL200710054384.5) and "gas drainage center split grouting sealing device and its sealing method" (ZL201110120920.3). A good sealing effect has been obtained, but with the release of the elastic potential of the coal body and the reduction of the gas pressure in the coal seam, the gaps around the drilled hole gradually develop and expand, and the coal seam drilled hole cannot be sealed tightly, and gas leakage occurs , it is difficult to maintain the grouting pressure, and the ideal sealing effect cannot be achieved. In addition, due to the differences in the geological conditions of coal seams in different coal mines, hole collapse often occurs, which makes the hole sealing device with a large diameter unable to be inserted into the coal seam borehole smoothly, which has a certain impact on hole sealing. Moreover, the previous sealing devices are all double-pouch, the processing is more complicated, and the cost is relatively high.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a device that can realize more effective grouting and sealing of holes in the sealing section, and better prevent the generation and development of air leakage cracks around the drilling of the sealing section. A central grout type single-sack bag grouting sealing device and a hole sealing method thereof.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: the central grout type single-bag grouting sealing device, including a recyclable grouting pipe, a grouting pipe joint, a front gas drainage pipe, a rear gas drainage pipe, Drainage device, double-hole pipe and expansion bushing, the front end of the double-hole pipe is connected with the rear end of the front gas drainage pipe through the drainage device, the rear end of the double-hole pipe is connected with the front end of the rear gas drainage pipe through the rear clamp; The double holes are the grouting channel and the drainage channel respectively. The front and rear ends of the drainage channel are respectively connected with the front gas drainage pipe and the rear gas drainage pipe. The expansion bush is cylindrical and hollow inside, and the expansion bush is evenly arranged There are several exhaust seepage holes, and the exhaust seepage holes are evenly arranged along the circumference and axial direction of the surface of the expansion bush. The expansion bush is covered with an expansion bag, and the front edge of the expansion bag and the expansion bush passes through The front steel ring is compressed and sealed on the outer circumference of the double-hole pipe, the rear edge of the expansion bladder and the expansion bush is compressed and sealed on the outer circumference of the rear gas drainage pipe through the rear steel ring, and the drainage device is coaxially arranged on the front On the outside of the gas extraction pipe, the front end of the drainage device is connected to the rear end of the recyclable grouting pipe through the grouting pipe joint, and the rear end of the drainage device is connected to the front part of the grouting channel of the double-hole pipe. A grout outlet is opened inside the bag; a pressure control valve is arranged on the grouting channel of the double-hole pipe, and the pressure control valve is located between the drainage device and the front steel ring.

The drainage device includes a front clamp and a drainage tube arranged on the outside of the front clamp. The front end of the drainage tube is provided with a grouting connection port connected to the joint of the grouting pipe. The pulp inlet is connected to the pulp channel, and the pulp inlet is located in front of the front steel ring.

The drainage tube is provided with pin holes along the left and right directions, the rear end of the grouting pipe joint is inserted in the drainage tube and is sealed and fixedly connected with the drainage tube through the shear pin inserted in the pin hole; the front end of the grouting pipe joint is inserted in the In the recycled grouting pipe, the rear part of the recyclable grouting pipe is compressed and sealed with the grouting pipe joint through a compression sleeve.

The front and rear ends of the grouting channel of the double-hole pipe are provided with plugging cement or plugging blocks.

A screen pipe is connected to the rear end of the rear gas drainage pipe.

The hole sealing method of the middle part seepage type single bladder bag grouting hole sealing device comprises the following steps:

(1) Connect the screen pipe to the rear end of the gas drainage pipe, insert the grouting pipe joint connected to the recyclable grouting pipe into the grouting connection port of the drainage pipe, and insert the shear pin into the pin hole to fix the grouting pipe connector;

(2) Insert the central grouting type single-bag grouting sealing device together with the recyclable grouting pipe into the coal seam drilling to the appropriate sealing depth;

(3) Connect the front end of the recyclable grouting pipe to the external grouting pump, check whether the grouting pump and the pressure gauge on the grouting pump are normal, and prepare the grouting slurry;

(4) Insert the grouting pipe of the grouting pump into the grouting slurry, start the grouting pump to start grouting and sealing, the grouting pressure gradually increases, and the grouting slurry passes through the grouting pump—the recyclable grouting pipe - Grouting pipe joint - Drainage tube - Grouting inlet - Grouting channel - Grouting outlet - Expansion bushing, the expansion bushing expands with grout, the exhaust grout hole increases, and part of the grout enters and expands through the exhaust grout hole The bladder penetrates into the coal seam cracks around the borehole, and when the predetermined grouting pressure is reached, the grouting pump is turned off to stop grouting;

(5) Pull out the recyclable grouting pipe firmly, cut off the shear pin by the grouting pipe joint, recycle the grouting head and the recyclable grouting pipe, and complete the grouting and sealing operation, and then check the grouting pipe joint and the recyclable grouting pipe The pipe and the grouting pump are cleaned and used for the next sealing.

Adopt above-mentioned technical scheme, the present invention has following technical effect:

1. The present invention adopts a double-hole pipe integrating the extraction channel and the grouting channel, which greatly simplifies the structure of the sealing device, and overcomes the disadvantages in the prior art that an additional grouting channel needs to be provided, which is large in size and complex in structure. It can adapt to the geological conditions of coal seams in different coal mines, is convenient to operate, improves work efficiency, and can realize more effective grouting plugging of the borehole in the sealing section, and more effectively avoid the generation and development of coal wall cracks around the drilling section of the sealing section. Moreover, it can also fill very small coal cracks, so that the sealing effect can be optimized.

2. In the present invention, an expansion bushing is arranged inside the expansion bag, and the expansion bushing can support and fix the expansion bag. The expansion bush is provided with an exhaust seepage hole, and the grouting slurry can enter the expansion liner through the exhaust seepage hole. The bladder and the back end of the gas drainage pipe are connected with a screen pipe, which can prevent impurities such as gravel and coal from entering the borehole. The strength of the structural material and the grouting material of the invention does not affect the coal cutting by the shearer, and no sparks are generated during the coal cutting operation, enabling efficient and safe mining.

3. Both ends of the grouting channel of the present invention are blocked with plugging cement or plugging blocks to avoid the leakage of grouting slurry, ensure that the grouting pressure remains constant, and improve the sealing effect, and use shear pins in the drainage tube to fix the grouting tube Connectors, after the grouting and sealing are completed, pull out the recyclable grouting pipe and the grouting pipe joint, and they can be reused after cleaning.

4. The pressure control valve can control the grouting pressure in the expansion bladder and at the same time ensure the safety of the expansion bladder. When the grouting pressure of the expansion bladder reaches the set pressure of the pressure control valve, the pressure control valve will open and play the role of a safety valve. Prevent the expansion bladder from bursting due to excessive grouting pressure in the expansion bladder.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the enlarged view of place A in Fig. 1;

Fig. 3 is a schematic structural view of the drainage device in Fig. 1;

Fig. 4 is a B-B sectional view in Fig. 3 .

detailed description

As shown in Figures 1 to 4, the central grouting type single-bag grouting sealing device of the present invention includes a recyclable grouting pipe 1, a grouting pipe joint 2, a front gas drainage pipe 3, and a rear gas drainage pipe. Pipe 4, drainage device 5, double-hole pipe 6 and expansion bush 7, the front end of double-hole pipe 6 is connected to the rear end of front gas drainage pipe 3 through drainage device 5, the rear end of double-hole pipe 6 is connected to rear gas drainage pipe 4 The front end is connected by the rear clamp 18; the double holes in the double-hole pipe 6 are respectively the grouting channel 10 and the drainage channel 11, and the front and rear ends of the drainage channel 11 are connected with the front gas drainage pipe 3 and the rear gas drainage pipe 4 respectively. Connected, the expansion bush 7 is cylindrical and hollow inside, and several exhaust grouting holes 12 are evenly arranged on the expansion bush 7, and the exhaust grouting holes 12 are evenly distributed along the circumferential direction and the axial direction of the surface of the expansion bush 7. Arranged, the expansion sleeve 7 is covered with an expansion bladder 8, and the front edge of the expansion bladder 8 and the expansion sleeve 7 are compressed and sealed on the outer circumference of the double-hole tube 6 through the front steel ring 14, and the expansion bladder 8 and the expansion sleeve 7 are tightly sealed. The rear end edge of the bushing 7 is compressed and sealed on the outer circumference of the rear gas extraction pipe 4 through the rear steel ring 15, the drainage device 5 is coaxially arranged outside the front gas extraction pipe 3, and the front end of the drainage device 5 passes through the grouting pipe The joint 2 is connected to the rear end of the recyclable grouting pipe 1, and the rear end of the drainage device 5 communicates with the front part of the grouting channel 10 of the double-hole pipe 6, and the grouting channel 10 of the double-hole pipe 6 is provided with an outlet in the expansion bag 8. A grout port 17; a pressure control valve 19 is provided on the grouting channel 10 of the double-hole pipe 6, and the pressure control valve 19 is located between the drainage device 5 and the front steel ring 14.

The drainage device 5 includes a front clamp 9 and a drainage tube 5-1 arranged on the outside of the front clamp 9. The front end of the drainage tube 5-1 is provided with a grouting connection port 5-2 connected to the grouting pipe joint 2, and the drainage tube The rear end of 5-1 and the side of the front clamp 9 are correspondingly provided with a grout inlet 5-3 communicating with the grouting channel 10, and the grout inlet 5-3 is located in front of the front steel ring 14.

The drainage tube 5-1 is provided with pin holes along the left and right directions, and the rear end of the grouting pipe joint 2 is inserted in the drainage tube 5-1 and sealed with the drainage tube 5-1 by the shear pin 20 inserted in the pin hole Fixed connection; the front end of the grouting pipe joint 2 is inserted into the recyclable grouting pipe 1, and the rear part of the recyclable grouting pipe 1 is tightly and sealed connected with the grouting pipe joint 2 through a compression sleeve.

The front and rear ends of the grouting channel 10 of the double-hole pipe 6 are provided with plugging cement or plugging blocks 13 .

The rear end of the rear gas drainage pipe 4 is connected with a screen pipe.

The middle part seepage type grouting sealing method of the present invention comprises the following steps:

(1) Connect the screen pipe at the rear end of the rear gas drainage pipe 4, insert the grouting pipe joint 2 connected to the recyclable grouting pipe 1 into the grouting connection port 5-2 of the drainage pipe 5-1, and cut the The cutting pin 20 is inserted into the pin hole to fix the grouting pipe joint 2;

(2) Insert the central grouting type single-bag grouting sealing device together with the recyclable grouting pipe 1 into the coal seam drilling to a suitable sealing depth;

(3) Connect the front end of the recyclable grouting pipe 1 to the external grouting pump, check whether the grouting pump and the pressure gauge on the grouting pump are normal, and prepare the grouting slurry;

(4) Insert the grouting pipe of the grouting pump into the grouting slurry, start the grouting pump to start grouting and sealing, the grouting pressure gradually increases, and the grouting slurry passes through the grouting pump—the recyclable grouting pipe 1—grouting pipe joint 2—drainage device 5—grouting inlet 5-3—grouting channel 10—grouting outlet 17—expansion bushing 7, expansion bushing 7 enters grout and expands, exhaust grouting hole 12 increases , part of the grout enters the expansion bag 8 through the exhaust grouting hole, and infiltrates into the coal seam cracks around the drill hole. When the predetermined grouting pressure is reached, the grouting pump is turned off to stop the grouting;

(5) Forcefully pull the recyclable grouting pipe 1, cut off the shear pin 20 with the grouting pipe joint 2, recover the grouting head and the recyclable grouting pipe 1, and complete the grouting and sealing operation, the grouting pipe joint 2 , The grouting pipe 1 and the grouting pump can be recovered for cleaning and used for the next sealing.

The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from it. Any modifications or partial replacements within the spirit and scope of the present invention shall fall within the scope of the claims of the present invention.

Claims (6)

1. The central grout type single-bag grouting sealing device is characterized in that it includes a recyclable grouting pipe, a grouting pipe joint, a front gas drainage pipe, a rear gas drainage pipe, a drainage device, a double hole pipe and Expansion bushing, the front end of the double-hole pipe is connected to the rear end of the front gas drainage pipe through a drainage device, and the rear end of the double-hole pipe is connected to the front end of the rear gas drainage pipe through a rear clamp; the double holes in the double-hole pipe are respectively grouting channels And the drainage channel, the front and rear ends of the drainage channel are respectively connected with the front gas drainage pipe and the rear gas drainage pipe, the expansion bush is cylindrical and the interior is hollow, and several exhaust seepage grouts are evenly arranged on the expansion bush Holes, exhaust grouting holes are evenly arranged along the circumference and axial direction of the surface of the expansion bush, and the expansion bush is covered with an expansion bag, and the front edge of the expansion bag and the expansion bush is pressed and sealed by the front steel ring. On the outer circumference of the double-hole pipe, the rear end edge of the expansion bag and the expansion bushing are pressed and sealed on the outer circumference of the rear gas drainage pipe through the rear steel ring. The front end of the device is connected to the rear end of the recyclable grouting pipe through the grouting pipe joint, and the rear end of the drainage device is connected to the front part of the grouting channel of the double-hole pipe. The grouting channel in the double-hole pipe has a grout outlet inside the expansion bag ; The grouting channel of the double-hole pipe is provided with a pressure control valve, and the pressure control valve is located between the drainage device and the front steel ring. 2. The central grouting type single capsule bag grouting and sealing device according to claim 1, characterized in that: the drainage device comprises a front clamp and a drainage tube arranged outside the front clamp, and the front end of the drainage tube is provided with a The grouting connection port connected by the grouting pipe joint, the rear end of the drainage pipe and the side of the front clamp are correspondingly provided with a grouting port connected with the grouting channel, and the grouting port is located in front of the front steel ring. 3. The central grouting type single bladder bag grouting and sealing device according to claim 2, characterized in that: the drainage tube is provided with pin holes along the left and right directions, and the rear end of the grouting pipe joint is inserted in the drainage tube and passed through The shear pin inserted in the pin hole is sealed and fixedly connected with the drainage pipe; the front end of the grouting pipe joint is inserted in the recyclable grouting pipe, and the rear part of the recyclable grouting pipe is compressed and sealed with the grouting pipe joint through a compression sleeve connect. 4. The central grouting type single-bag grouting and sealing device according to claim 1 or 2, characterized in that plugging cement or plugging blocks are provided at the front and rear ends of the grouting channel of the double-hole pipe. 5. The central seepage type single-bag grouting and sealing device according to claim 3, characterized in that: the rear end of the rear gas drainage pipe is connected with a screen pipe. 6. The hole sealing method of the middle part seepage type single bladder bag grouting sealing device according to claim 5, characterized in that: comprising the following steps: (1) Connect the screen pipe to the rear end of the gas drainage pipe, insert the grouting pipe joint connected to the recyclable grouting pipe into the grouting connection port of the drainage pipe, and insert the shear pin into the pin hole to fix the grouting pipe connector; (2) Insert the central grouting type single-bag grouting sealing device together with the recyclable grouting pipe into the coal seam drilling to the appropriate sealing depth; (3) Connect the front end of the recyclable grouting pipe to the external grouting pump, check whether the grouting pump and the pressure gauge on the grouting pump are normal, and prepare the grouting slurry; (4) Insert the grouting pipe of the grouting pump into the grouting slurry, start the grouting pump to start grouting and sealing, the grouting pressure gradually increases, and the grouting slurry passes through the grouting pump—the recyclable grouting pipe - Grouting pipe joint - Drainage tube - Grouting inlet - Grouting channel - Grouting outlet - Expansion bushing, the expansion bushing expands with grout, the exhaust grout hole increases, and part of the grout enters and expands through the exhaust grout hole The bladder penetrates into the coal seam cracks around the borehole, and when the predetermined grouting pressure is reached, the grouting pump is turned off to stop grouting; (5) Pull out the recyclable grouting pipe firmly, cut off the shear pin by the grouting pipe joint, recycle the grouting head and the recyclable grouting pipe, and complete the grouting and sealing operation, and then check the grouting pipe joint and the recyclable grouting pipe The pipe and the grouting pump are cleaned and used for the next sealing.