Sealed hole sealing grouting device

Abstract

The utility model provides a sealing type hole sealing grouting device which comprises a drainage exhaust pipe, a grouting pipe, a blowout prevention extraction pipe, a pipe cap, a bag, filter screen cloth, a grout supplementing valve and an explosion valve, the drainage exhaust pipe and the grouting pipe are fixed on two sides of the blowout prevention extraction pipe, the hole bottom section of the blowout prevention extraction pipe is sealed by the pipe cap, and the bag is arranged on the bag. The tail end of the drainage and exhaust pipe is wrapped by filter screen cloth, the bag is fixed to the position, close to an orifice, of the grouting pipe, the two ends of the bag are sealed through bag plugs, the drainage and exhaust pipe is further provided with a grout supplementing valve, a hole is formed in the position, corresponding to the drainage and exhaust pipe, of the grout supplementing valve, and an explosion valve is installed at the tail end of the grouting pipe. The tail end of the blowout prevention extraction pipe is sealed by the pipe cap, so that a bag is saved, and the problem that the bag is scratched and leaks slurry in the mounting process is solved; according to the drainage and exhaust pipe, grout can be supplemented to the hole sealing section through the grout supplementing valve, and the effect that hole sealing of the hole sealing section is tight and free of air leakage is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hole sealing and grouting, in particular to a sealed hole sealing and grouting device. Background Art

[0002] The current method of sealing the drilling holes in coal mines by grouting is to wait until the drilling construction reaches the end of the hole before sealing the hole with grouting, using a method of two-bag blocking and one-injection grouting. Two-bag blocking and one-injection grouting is an early form of the pressure grouting sealing method. The two-bag blocking and one-injection grouting sealing device uses two bags to seal the borehole, and there is a bursting valve (slurry outlet) between the two bags. Its sealing principle is: use the grouting pipe to grout the bag. After the bag expands, the bag is in close contact with the borehole wall. When the grouting pressure exceeds the opening pressure of the bursting valve, the bursting valve explodes (slurry outlet) to grout the gap between the two bags into the gap between the bag and the borehole wall and the coal body cracks at a certain depth around the borehole, thereby achieving the sealing of the extraction borehole.

[0003] The bag two-blocking and one-injection sealing technology has the following disadvantages: the air and moisture in the drilling and sealing section and the grouting material cannot be completely discharged, which may cause the sealing material to not be fully filled after solidification. In the existing literature, the bag-type "two-blocking and one-injection" pressure grouting drainage and exhaust sealing technology adds a drainage and exhaust PE pipe from the end of the bag to the end of the sealing section. The drainage and exhaust PE pipe is arrayed and wrapped with high-strength non-woven fabric. However, the sealing technology in the existing literature cannot effectively solve the problem that the reserved drainage and exhaust PE pipe is prone to collapse due to the large number of holes and the installation of the bag is scratched by the hole wall, resulting in the air in the grouting and sealing section not being completely discharged and the bag's pressure bearing capacity being weakened, resulting in leakage, resulting in sealing leakage, grouting liquid entering the borehole and low extraction efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to seal the sealing section tightly without air leakage.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] The utility model provides a sealed hole sealing grouting device, comprising a drainage and exhaust pipe, a grouting pipe, a blowout prevention and extraction pipe, a pipe cap, a bag, a filter cloth, a grouting valve and a bursting valve, the drainage and exhaust pipe and the grouting pipe are fixed on both sides of the blowout prevention and extraction pipe, the pipe cap is used to seal the bottom section of the hole of the blowout prevention and extraction pipe, the end of the drainage and exhaust pipe is wrapped with a filter cloth, the bag is fixed on the grouting pipe near the hole mouth, and the two ends of the bag are sealed with a bag plug, the drainage and exhaust pipe is also provided with a grouting valve, the position of the grouting valve corresponds to a hole provided in the drainage and exhaust pipe, and the end of the grouting pipe is equipped with a bursting valve.

[0007] Beneficial effects: The present application first seals the borehole with grouting, and then performs construction drilling; a pipe cap is used to seal the end of the blowout prevention and extraction pipe, saving a bag and eliminating the problem of the bag being scratched and leaking during the installation process; the drainage and exhaust pipe of the present application can fill the sealed hole section with grouting through a grouting valve, ensuring that the sealed hole section is tightly sealed and leak-proof.

[0008] Preferably, the end of the drainage and exhaust pipe wrapped by the filter cloth is provided with holes, and the holes are arranged in a row in the filter cloth.

[0009] Preferably, the grouting valve is fixed by a clamp.

[0010] Preferably, the filter cloth is fixed to the end of the drainage exhaust pipe by a clamp.

[0011] Preferably, the end of the drainage and exhaust pipe is arranged at a position close to the bottom of the upward drilled hole or close to the hole mouth of the downward drilled hole.

[0012] Preferably, the tube cap is fixed at a distance of 20-40 cm from the bottom of the hole.

[0013] Preferably, the bag is arranged at a distance of 1 m from the orifice.

[0014] The advantages of the utility model are:

[0015] 1. The present application installs a grouting valve in the exhaust and drainage pipe to prevent the temporary stop of the pump due to wind, water and electricity during the grouting process, which may cause the initial coagulation of slurry in the grouting pipe to be unable to grout again when the grouting is restored. The grouting valve can be used for grouting; after the grouting of the grouting pipe is completed, the grouting pipe is tied up and left to standstill for a period of time. The grouting valve is used to pressurize and replenish the slurry for the second or multiple times. The replenished slurry will re-seal the empty shell space formed by the shrinkage of the sealing section and the coal seam cracks near the hole wall of the sealing section.

[0016] 2. The present application realizes the technical scheme of "one block and multiple injections" through bags, pipe caps, grouting pipes and drainage and exhaust pipes. The present application seals the hole through bags so that the air and water in the sealed section can only be discharged through the drainage and exhaust pipes, thereby solving the defects of hollowing and loss of grouting material caused by incomplete air discharge in the sealed hole section; the anti-blowout extraction pipe is sealed by the pipe cap, thereby solving the problem of leakage caused by scratches on the hole wall during installation of the bag. Grouting and grouting are performed multiple times through the grouting pipes and drainage and exhaust pipes, thereby ensuring the density of the slurry and the effect of sealing the borehole without air leakage, thereby improving the gas extraction effect.

[0017] 3. The device of the present application has a novel structure, convenient component processing, low cost, simple operation, convenient use, safety and reliability, is beneficial to mine gas control and gas extraction, and has a high degree of on-site application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 12 is a structural schematic diagram of a sealed hole sealing grouting device in an embodiment;

[0019] Figure 2 is a schematic diagram of the structure of the drainage and exhaust pipe in the embodiment;

[0020] In the figure: 1-drainage and exhaust pipe; 2-grouting pipe; 3-blowout prevention and extraction pipe; 4-pipe cap; 5-bladder bag; 6-filter cloth; 7-grouting valve; 8-burst valve; 9-clamp. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "fixation" and "connection" 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; it can be a direct connection, or it can be an indirect connection 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.

[0023] The embodiment is that after the construction workers have completed the sealing section, they first expand the hole, then wash the hole, and finally seal the hole.

[0024] Example 1

[0025] refer to Figure 1-2 The present embodiment provides a sealed hole sealing grouting device, including a drainage and exhaust pipe 1, a grouting pipe 2, a blowout prevention and extraction pipe 3, a pipe cap 4, a bag 5, a filter cloth 6, a grouting valve 7, a bursting valve 8 and a clamp 9.

[0026] like Figure 2 As shown, the drainage exhaust pipe 1 is close to the bottom section of the hole, and a hole is drilled in the drainage exhaust pipe 1, leaving a hole (not shown in the figure), which is conducive to the discharge of air and water in the sealed hole section through the drainage exhaust pipe 1, and the hole section of the drainage exhaust pipe 1 is wrapped with a filter cloth 6, and the filter cloth 6 is fixed with a clamp 9 to prevent the slurry from clogging the drainage exhaust pipe 1 and the slurry from flowing out of the drainage exhaust pipe 1 during the grouting process, so that the air and water in the sealed hole section cannot be discharged and the slurry usage is increased.

[0027] In addition, in order to prevent the grouting pipe 2 from stopping the pump for a long time due to wind, water and electricity reasons, the slurry in the grouting pipe 2 will initially solidify and can no longer be grouted. Therefore, a grouting valve 7 for grouting is left in the drainage and exhaust pipe 1, and a hole (not shown in the figure) is left in the drainage and exhaust pipe 1 at the position of the fixed grouting valve 7, which is conducive to the outflow of slurry and grouting of the sealed section.

[0028] The grouting valve 7 is installed in the drainage and exhaust pipe 1, which can not only perform grouting, but also perform grouting. After the grouting pipe 2 is grouted, it needs to be stopped for a period of time to wait for the slurry to coagulate. The stop time is determined according to the slurry characteristics. The grouting valve 7 is used to pressurize and replenish the slurry for two or more times. The replenished slurry blocks the empty shell space formed by the shrinkage of the sealing section and the coal seam cracks near the hole wall of the sealing section.

[0029] like Figure 1 As shown, the grouting valve 7 of the drainage and exhaust pipe 1 is arranged between the filter cloth 6 and the orifice, and the grouting valve 7 is fixed on one side by a clamp 8, so that the drainage and exhaust pipe 1 can play a role of grouting.

[0030] The drainage and exhaust pipe 1 is located in the sealing section. If the hole is drilled upward, the drainage and exhaust pipe 1 is located close to the bottom of the hole, and the air and water in the sealing section are easily discharged. If the hole is drilled downward, the drainage and exhaust pipe 1 is located close to the hole mouth, and the air and water in the sealing section are gathered at the hole mouth. The drainage and exhaust pipe 1 is arranged close to the hole mouth, which is more conducive to the discharge of air and water in the sealing section.

[0031] The drainage and exhaust pipe 1 and the grouting pipe 2 are fixed to both sides of the blowout prevention and extraction pipe 3 by means of tie bands, and are simultaneously sent into the borehole to reach the sealing section.

[0032] A bursting valve 8 is installed at the end of the grouting pipe 2 near the orifice for sealing. The grouting pipe 2 is connected to the bag 5 near the orifice. The connected bags 5 at both ends are sealed with bag plugs (not shown) to prevent the slurry from flowing out of the bag and the grouting pipe 2.

[0033] When using a grouting pump to grout the grouting pipe 2, the bag 5 needs to be filled first, and then the sealing section can be grouted. When the bag 5 expands and cannot be loaded with slurry, the grouting pump continues to grout. When the pressure reaches a certain value, the bursting valve 8 of the grouting pipe 2 is forced to open, and the slurry enters the sealing section to grout and seal the sealing section.

[0034] The blowout preventer and extraction pipe 3 is a combination of a borehole blowout preventer and a borehole extraction pipe. The size of the borehole blowout preventer used by technicians in this field is 6 inches, while the size of the borehole extraction pipe is 2.5 inches. In this embodiment, the borehole blowout preventer and the borehole extraction pipe can be of the same size, and a 5-inch blowout preventer and extraction pipe can be used as the blowout preventer and the extraction pipe. The size of the blowout preventer and extraction pipe 3 can be selected according to the designed borehole diameter.

[0035] The bottom section of the blowout prevention extraction pipe 3 is sealed with the pipe cap 4 , which is 20-40 cm away from the bottom of the hole. When the blowout prevention extraction pipe 3 is installed, the residual coal slag in the hole can be pushed into the reserved space at the bottom of the hole, which is convenient for fixing the pipe cap 4 in the blowout prevention extraction pipe 3 .

[0036] The drainage and exhaust pipe 1 and the grouting pipe 2 are fixed on both sides of the blowout prevention and extraction pipe 3, and the fixing method can use tools such as cable ties and wires. The bag 5 is fixed on the blowout prevention and extraction pipe 3 at a position close to the orifice 1m.

[0037] In this embodiment, a grouting pump is used to grout the bag 5 through the grouting pipe 2. When the bag 5 expands and the bursting valve 8 bursts open, the air and water in the sealing section are discharged through the drainage and exhaust pipe 1. The grouting pump is used to continue grouting the grouting pipe 2. After the drainage and exhaust pipe 1 no longer drains and exhausts, the slurry cannot pass through the filter cloth 6 of the drainage and exhaust pipe 1 and is retained. The drainage and exhaust pipe 1 is tightened and grouting is continued. After the expected grouting amount is completed, the grouting pipe 2 is tightened, and it is stagnant for a period of time to wait for the slurry to initially set. The grouting pump is then connected to the drainage and exhaust pipe 1 to grout the sealing section. The slurry enters the drilling sealing section through the grouting valve 7 under the pressure of the grouting pump. The supplemented slurry re-seals the empty shell space formed by the shrinkage of the sealing section and the coal seam cracks near the hole wall of the sealing section, thereby ensuring the density of the slurry, ensuring the tightness and airtightness of the drilling sealing section, and improving the gas extraction effect.

[0038] The present application realizes the "one block, one seal, multiple injections" technology through the bag 5, the pipe cap 4, the grouting pipe 2 and the drainage exhaust pipe 1. The present application seals through the bag 5 so that the air and water in the sealed section can only be discharged through the drainage exhaust pipe 1, which solves the defect that the air in the sealed section is not completely discharged and forms hollows; the anti-blowout extraction pipe 3 is sealed by the pipe cap 4, which solves the problem of leakage caused by scratches on the hole wall due to the installation of the bag. Grouting and grouting are performed multiple times through the grouting pipe 2 and the drainage exhaust pipe 1, which ensures the density of the slurry, and also ensures the effect of the borehole being sealed and leak-proof, thereby improving the gas extraction effect.

[0039] The device of the present application has a novel structure, convenient component processing, low cost, simple operation, convenient use, safety and reliability, is beneficial to mine gas control and gas extraction, and has a high degree of on-site application.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealed hole sealing grouting device, characterized in that: The invention comprises a drainage and exhaust pipe (1), a grouting pipe (2), a blowout prevention and extraction pipe (3), a pipe cap (4), a bag (5), a filter cloth (6), a grouting valve (7) and a bursting valve (8); the drainage and exhaust pipe (1) and the grouting pipe (2) are fixed on both sides of the blowout prevention and extraction pipe (3); the bottom section of the hole of the blowout prevention and extraction pipe (3) is sealed by the pipe cap (4); the end of the drainage and exhaust pipe (1) is wrapped by the filter cloth (6); the bag (5) is fixed on the grouting pipe (2) at a position close to the hole, and the two ends of the bag (5) are sealed by the bag plug; the drainage and exhaust pipe (1) is also provided with a grouting valve (7); a hole is provided at the position of the grouting valve (7) corresponding to that of the drainage and exhaust pipe (1); and a bursting valve (8) is provided at the end of the grouting pipe (2).

2. The sealed hole sealing grouting device according to claim 1, characterized in that: The grouting valve (7) is fixed by a clamp (9).

3. The sealed hole sealing grouting device according to claim 1, characterized in that: The end of the drainage and exhaust pipe (1) wrapped by the filter cloth (6) is provided with holes, and the holes are arranged in a row in the filter cloth (6).

4. The sealed hole sealing grouting device according to claim 1, characterized in that: The filter cloth (6) is fixed to the end of the drainage and exhaust pipe (1) via a clamp (9).

5. The sealed hole sealing grouting device according to claim 1, characterized in that: The end of the drainage and exhaust pipe (1) is arranged at a position close to the bottom of the upward drilled hole or close to the hole opening of the downward drilled hole.

6. The sealed hole sealing grouting device according to claim 1, characterized in that: The pipe cap (4) is fixed at a distance of 20-40 cm from the bottom of the hole.

7. The sealed hole sealing grouting device according to claim 1, characterized in that: The bag (5) is arranged at a distance of 1 m from the orifice.

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