Underground targeted grouting construction device and method

Abstract

The invention discloses an underground targeted grouting construction device and method, and solves the technical problem that in the prior art, grouting pressure can be rapidly attenuated in a grouting hole, so that grout cannot completely cover a target area, and the grouting and water plugging effect is poor. The underground targeted grouting construction device comprises an orifice pipe, a grouting guide pipe and a grouting spacer, a cover plate is arranged at the grouting end of the orifice pipe, and a first grouting opening and a second grouting opening are formed in the cover plate; the grouting guide pipe is arranged in the orifice pipe, and the feeding end of the grouting guide pipe communicates with the second grouting opening. And the grouting spacer is arranged on the grouting guide pipe. According to the underground targeted grouting construction device, grout can be conveyed to a designated position through the grouting guide pipe arranged in the orifice pipe, and double-liquid grout is poured between the grouting drill hole and the grouting guide pipe through the first grouting opening to protect the grouting guide pipe, so that the pressure of the grout is guaranteed, the high-pressure grout can be released and diffused in a designated area, and the grouting efficiency is improved. The diffusion range and the filling effect of the slurry are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of mine construction technology, and specifically relates to an underground targeted grouting construction device and method. Background Art

[0002] The hydrogeological boundary conditions in the Dashui Mine are relatively complex. The Quaternary gravel and pebble aquifer overlying the ore body is widely distributed, thick, and extremely permeable and water-rich.

[0003] Taking the Macheng Iron Mine as an example, the fault structure of the mining area of ​​the Macheng Iron Mine is well developed. The F1, F2 and F3 (F1, F2 and F3 are adjacent faults) faults are interrelated and influence each other. The fault fracture zone has strong water content and permeability, forming the main bedrock structural fissure aquifer in the mining area.

[0004] During the infrastructure construction process, multiple horizontal development projects need to cross the F1, F2 and F3 aquifers and the fault-affected zone aquifers. The aquifers have a high head and a hydrostatic pressure of 5-9 MPa. At the same time, the aquifers in the broken zone contain mud and sand, with a small and uneven permeability surface and poor permeability.

[0005] When the tunnel of the development project is excavated to this area, it is necessary to reserve a lead distance of more than 25m according to the technical specifications for water prevention and control safety, and then carry out grouting and water blocking work on the working face of the underground tunnel. Grouting holes are arranged around the tunnel according to the fault size and the slurry diffusion radius. The grouting holes are arranged in a fan shape according to the designed external insertion angle. The depth of the grouting holes is generally 50-60m. The grouting pressure is controlled to be greater than 2.5 times the hydrostatic pressure, and the general grouting pressure reaches 15-30Mpa;

[0006] However, the diameter of the grouting pipe is smaller than the diameter of the grouting hole. As the hole depth increases, the grouting pressure decays rapidly in the grouting hole, resulting in the slurry being unable to completely cover the target area. The grouting water blocking effect is getting worse and worse, and the negative impact is the leakage of the reserved grouting cap and repeated water discharge from the drilling holes in key areas. Therefore, it is a technical problem that technicians in this field need to solve urgently to invent a device and method that can release and diffuse the grouting pressure in a specified area to improve the grouting effect. Summary of the invention

[0007] In order to solve the above technical problems, the present application provides an underground targeted grouting construction device on the one hand to solve the technical problem in the prior art that the grouting pressure will decay rapidly in the grouting hole, making it impossible for the slurry to completely cover the target area, resulting in poor grouting and water blocking effect.

[0008] The technical solution adopted to achieve the purpose of this application is:

[0009] A downhole targeted grouting construction device comprises an orifice pipe, a grouting conduit and a grouting spacer;

[0010] The grouting end of the orifice pipe is provided with a cover plate, and the cover plate is provided with a first grouting port and a second grouting port;

[0011] The grouting conduit is disposed in the orifice pipe, and a feed end of the grouting conduit is in communication with the second grouting port;

[0012] The grouting spacer is arranged on the grouting conduit, and the grouting spacer is arranged close to the discharge end of the grouting conduit.

[0013] In order to better realize the present application, further optimization is made in the above structure, wherein the grouting spacer includes a gas supply bottle, an expansion plastic bag and a lifting rope;

[0014] The expansion plastic bag is sleeved on the outside of the grouting conduit;

[0015] The gas outlet end of the gas supply bottle is connected to the inflation port of the expansion plastic bag;

[0016] The fixed end of the pulling rope is connected to the sealing valve of the gas supply bottle.

[0017] In order to better realize the present application, further optimization is made in the above structure, the expansion plastic bag is a "U"-shaped structure, and the grouting conduit is clamped in the depression of the expansion plastic bag.

[0018] In order to better realize the present application, further optimization is made in the above structure, the expandable plastic bag is an annular structure, and the grouting conduit is inserted in the center hole of the expandable plastic bag.

[0019] In order to better realize the present application, further optimization is made in the above structure, the grouting end of the orifice pipe is provided with a connecting flange, and the cover plate is detachably arranged on the grouting end of the orifice pipe through the connecting flange.

[0020] In order to better realize the present application, further optimization is made in the above structure, and a first valve is provided at the first grouting port, and a second valve is provided at the second grouting port.

[0021] On the other hand, the present application also provides a downhole targeted grouting construction method, the method is implemented by the downhole targeted grouting construction device mentioned above, and the method comprises the following steps:

[0022] Open grouting drilling holes;

[0023] The orifice pipe sleeve is arranged at the grouting end of the grouting borehole;

[0024] Lower the grouting conduit, start the grouting spacer, make the outer wall of the grouting spacer fit the inner wall of the grouting borehole, and separate the two ends of the grouting borehole;

[0025] A cover plate is installed at the grouting end of the orifice pipe, and the first grouting port is connected to the space between the cover plate and the grouting spacer, and the second grouting port is connected to the feed end of the grouting conduit;

[0026] Injecting double-liquid slurry into the space between the cover plate and the grouting spacer through the first grouting port;

[0027] After the double-liquid slurry solidifies into a cement stone body, the filling slurry is poured into the grouting conduit through the second grouting port.

[0028] In order to better realize the present application, further optimization is made in the above method, and the injection pressure of the double-liquid slurry is 0.5 MPa.

[0029] In order to better realize the present application, further optimization is made in the above method, and the ratio of water glass to calcium chloride solution in the double liquid slurry is 1:1.

[0030] It can be seen from the above technical scheme that the downhole targeted grouting construction device provided by the present application can deliver the slurry to the designated position through the grouting conduit arranged in the orifice pipe, and before grouting, the double-liquid slurry is poured between the grouting borehole and the grouting conduit through the first grouting port, and the grouting conduit is protected by the solidified double-liquid slurry to ensure the pressure of the slurry passing through the grouting conduit, so that the high-pressure slurry can be released and diffused in the designated area, thereby effectively improving the diffusion range and filling effect of the slurry, so as to avoid leakage of the reserved grouting rock cap and repeated water discharge from the boreholes in key areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of an underground targeted grouting construction device for this application;

[0032] Figure 2 This is a schematic diagram of the structure of a grouting spacer (a grouting spacer with a "U-shaped" expansion plastic bag) in a downhole targeted grouting construction device of the present application when it cooperates with a grouting conduit;

[0033] Figure 3 This is a schematic diagram of the structure of a grouting spacer (a grouting spacer with an annular expansion bag) in a downhole targeted grouting construction device of the present application when it cooperates with a grouting conduit;

[0034] Figure 4 This is a schematic structural diagram of an underground targeted grouting construction device in use according to the present application.

[0035] Description of reference numerals:

[0036] 1- orifice pipe, 11- connecting flange;

[0037] 2- Grouting duct;

[0038] 3- Grouting spacer;

[0039] 4-cover plate; 41-first valve, 42-second valve;

[0040] 5- Grouting drilling. DETAILED DESCRIPTION

[0041] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0042] In the embodiments of the present application, Figures 1 to 4 As shown, the underground targeted grouting construction device includes an orifice pipe 1, a grouting conduit 2 and a grouting spacer 3; wherein,

[0043] The orifice pipe 1 is a tubular structure with two ends open. A cover plate 4 is provided at the grouting end of the orifice pipe 1. The cover plate 4 is provided with a first grouting port and a second grouting port. Figure 1 ;

[0044] The grouting conduit 2 is arranged in the orifice pipe 1, and the feed end of the grouting conduit 2 is communicated with the second grouting port;

[0045] The grouting spacer 3 is arranged on the grouting conduit 2 , and the grouting spacer 3 is arranged close to the discharge end of the grouting conduit 2 .

[0046] During the grouting process, the staff needs to insert the grouting end of the orifice pipe 1 into the grouting borehole 5, and make the grouting end of the orifice pipe 1 coincide with the grouting end of the grouting borehole 5, see Figure 4 At this time, the staff can lower the grouting conduit 2, insert the grouting conduit 2 from the grouting end of the orifice pipe 1, and extend it to the depth of the grouting borehole 5, so that the discharge end of the grouting conduit 2 extends to the designated area;

[0047] Then, the staff can start the grouting spacer 4, and the grouting spacer 3 can be expanded to disconnect the two ends of the grouting borehole 5, that is, to separate the two ends of the grouting borehole 5;

[0048] Then, the staff can cover the cover plate 4 on the grouting end of the orifice pipe 1, and make the first grouting port communicate with the space between the grouting spacer 3 and the grouting end of the orifice pipe 1, and the second grouting port communicate with the feed end of the grouting conduit 2; and then pour the double liquid slurry into the space between the grouting spacer 3 and the grouting end of the orifice pipe 1 through the first grouting port;

[0049] After the double liquid slurry solidifies into a cement stone body, the staff can pour the filling slurry into the grouting tube 2 through the second grouting port. The filling slurry flows to the designated area through the grouting tube 2 and is released and diffused in the designated area. The grouting tube 2 can slow down the attenuation of the pressure of the filling slurry, thereby effectively improving the diffusion range and filling effect of the slurry.

[0050] It should be noted that the diameter of the grouting conduit 2 is smaller than or equal to the diameter of the injection conduit (the conduit for providing high-pressure filling slurry), and the length of the injection conduit 2 is greater than the length of the orifice pipe 1, so that the discharge end of the grouting conduit 2 exceeds the position covered by the orifice pipe 1, and the high-pressure filling slurry will not have pressure attenuation in the grouting conduit 2, so that the high-pressure filling slurry can be released and diffused in the specified area, so as to improve the diffusion range and filling effect of the slurry;

[0051] In addition, the above-mentioned grouting conduit 2 is made of PC material or PVC material. After the grouting and water blocking work is completed, drilling needs to be continued. The grouting conduit 2 made of PC material or PVC material will not affect the progress of the drilling equipment, so that the drilling process is smoother.

[0052] In some embodiments, the above-mentioned grouting spacer 3 includes a gas supply bottle, an expansion plastic bag and a pull rope; wherein,

[0053] The expansion bag is sleeved on the outside of the grouting conduit 2. The side of the expansion bag away from the grouting conduit 2 can expand outward after being squeezed by the gas, that is, expand in the direction away from the grouting conduit 2, so that it can block the grouting borehole 5.

[0054] The gas outlet end of the gas supply bottle is connected to the inflation port of the expansion plastic bag;

[0055] The fixed end of the lifting rope is connected to the sealing valve of the gas supply bottle;

[0056] The staff can pull the sealing valve of the gas supply bottle through the pulling rope, so that the compressed gas in the gas supply bottle can enter the expansion plastic bag through the gas outlet end of the gas supply bottle, so that the expansion plastic bag can expand rapidly, thereby achieving the separation of the two ends of the grouting borehole 5; this operation method is relatively simple and can effectively improve work efficiency.

[0057] It should be noted that when lowering the grouting conduit 2, it is necessary to ensure that the pulling end of the pulling rope is always located at the grouting end of the orifice pipe 1 to ensure that the staff can grasp the pulling rope.

[0058] In some embodiments, the above-mentioned expansion plastic bag is a "U" shaped structure, see Figure 2 , the grouting conduit 2 is clamped in the depression of the expansion plastic bag;

[0059] When the staff pulls the lifting rope, the sealing valve of the gas supply bottle is opened, and the compressed gas in the gas supply bottle quickly enters the expansion plastic bag, causing the side of the expansion plastic bag away from the grouting conduit 2 to expand and fit against the side wall of the grouting borehole 5. At the same time, the two ends of the expansion plastic bag also approach each other and fit tightly, sealing the gap between the two ends of the expansion plastic bag to achieve separation of the two ends of the grouting borehole 5.

[0060] In some embodiments, the above-mentioned expansion plastic bag can also be configured as a ring structure, see Figure 3 , the grouting conduit 2 is inserted into the center hole of the expansion plastic bag;

[0061] When the staff pulls the lifting rope, the sealing valve of the gas supply bottle is opened, and the compressed gas in the gas supply bottle quickly enters the expansion plastic bag, so that the expansion plastic bag is away from one side of the grouting tube 2, that is, the outer wall of the expansion plastic bag quickly expands and fits on the side wall of the grouting borehole 5, and the inner wall of the expansion plastic bag is close to the grouting tube 2 to achieve the separation of the two ends of the grouting borehole 5.

[0062] Preferably, in order to better fix the expansion plastic bag on the grouting conduit 2, the two sides of the expansion plastic bag (the two sides of the expansion plastic bag facing the feeding end and the discharging end of the grouting conduit 2 respectively) are adhered to the grouting conduit 2 by adhesive tape, so that when the staff lowers the grouting conduit 2, the position of the expansion plastic bag will not change;

[0063] In addition, the above-mentioned setting position of the gas supply bottle has no effect on the entire grouting process. In order to facilitate the start-up of the grouting spacer 3, the gas supply bottle can be located on the side of the grouting end of the expansion plastic bag facing the orifice pipe 1, so that the staff can open the sealing valve on the gas supply bottle. After the double liquid slurry is poured into the space between the grouting spacer 3 and the grouting end of the orifice pipe 1, the gas supply bottle is covered with the double liquid slurry.

[0064] In some embodiments, the grouting end of the orifice pipe 1 is provided with a connecting flange 11, and the cover plate 4 is detachably provided at the grouting end of the orifice pipe 1 through the connecting flange 11, so that the installation and disassembly of the cover plate 4 is more convenient, thereby effectively improving work efficiency.

[0065] In some embodiments, a first valve 41 is provided at the first grouting port, and a second valve 42 is provided at the second grouting port.

[0066] Based on the above-mentioned underground targeted grouting construction device, the present application also provides an underground targeted grouting construction method, which is implemented by the above-mentioned underground targeted grouting construction device, and the method includes the following steps:

[0067] Opening a grouting borehole 5 on the fault fracture zone;

[0068] The orifice pipe 1 is sleeved on the grouting end of the grouting borehole 5;

[0069] Lower the grouting conduit 2, start the grouting spacer 3, make the outer wall of the grouting spacer 3 fit the inner wall of the grouting borehole 5, and separate the two ends of the grouting borehole 5;

[0070] A cover plate 4 is installed at the grouting end of the orifice pipe 1, and the first grouting port is connected to the space between the cover plate 4 and the grouting spacer 3, and the second grouting port is connected to the feed end of the grouting conduit 2;

[0071] Inject double liquid slurry into the space between the cover plate 4 and the grouting spacer 3 through the first grouting port;

[0072] After the double liquid slurry solidifies into a cement stone body, the filling slurry is poured into the grouting pipe 2 through the second grouting port. The filling slurry is released and diffused to the designated area through the discharge end of the grouting pipe 2, so as to squeeze and push the water in the fault fracture zone toward the periphery of the grouting borehole 5, thereby achieving the purpose of water blocking and reinforcement management of the fracture zone section.

[0073] In some embodiments, the injection pressure of the dual-liquid slurry is 0.5 MPa to avoid the grouting conduit 2 being squeezed and damaged due to excessive pressure.

[0074] In some embodiments, the ratio of water glass to calcium chloride solution in the double liquid slurry is 1:1. The double liquid slurry of this ratio has sufficient strength after solidification and forms a complete and dense cement stone body. The cement stone body can protect the grouting conduit 2 so that the grouting conduit 2 will not be burst during the pouring of the filling slurry.

[0075] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0076] 1) The underground targeted grouting construction device can deliver the slurry to the designated location through the grouting conduit 2 arranged in the orifice pipe 1, and before grouting, the double-liquid slurry is poured between the grouting borehole 5 and the grouting conduit 2 through the first grouting port, and the grouting conduit 2 is protected by the solidified double-liquid slurry to ensure the pressure of the slurry passing through the grouting conduit 2, so that the high-pressure slurry can be released and diffused in the designated area, thereby effectively improving the diffusion range and filling effect of the slurry.

[0077] 2) The grouting spacer 3 in the underground targeted grouting construction device has a simple structure and is easy to operate, so as to improve the grouting efficiency.

[0078] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0079] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An underground targeted grouting construction device, characterized in that: It comprises an orifice pipe (1), a grouting conduit (2) and a grouting spacer (3); The grouting end of the orifice pipe (1) is provided with a cover plate (4), and the cover plate (4) is provided with a first grouting port and a second grouting port; The grouting conduit (2) is arranged in the orifice pipe (1), and the feed end of the grouting conduit (2) is connected to the second grouting port; The grouting spacer (3) is arranged on the grouting conduit (2), and the grouting spacer (3) is arranged close to the discharge end of the grouting conduit (2).

2. The underground targeted grouting construction device according to claim 1, characterized in that: The grouting spacer (3) comprises a gas supply bottle, an expansion plastic bag and a lifting rope; The expansion plastic bag is sleeved on the outside of the grouting conduit (2); The gas outlet end of the gas supply bottle is connected to the inflation port of the expansion plastic bag; The fixed end of the pulling rope is connected to the sealing valve of the gas supply bottle.

3. The underground targeted grouting construction device according to claim 2, characterized in that: The expansion plastic bag is of a "U"-shaped structure, and the grouting conduit (2) is clamped in a recessed position of the expansion plastic bag.

4. The underground targeted grouting construction device according to claim 2, characterized in that: The expansion plastic bag is an annular structure, and the grouting conduit (2) is inserted into the central hole of the expansion plastic bag.

5. The underground targeted grouting construction device according to claim 1, characterized in that: The grouting end of the orifice pipe (1) is provided with a connecting flange (11), and the cover plate (4) is detachably arranged on the grouting end of the orifice pipe (1) via the connecting flange (11).

6. The underground targeted grouting construction device according to claim 1, characterized in that: A first valve (41) is provided at the first grouting port, and a second valve (42) is provided at the second grouting port.

7. A method for underground targeted grouting construction, characterized in that: The method is implemented by the downhole targeted grouting construction device described in any one of claims 1 to 6, and the method comprises the following steps: Opening a grouting borehole (5); The orifice pipe (1) is sleeved on the grouting end of the grouting borehole (5); Lowering the grouting conduit (2), starting the grouting spacer (3), making the outer wall of the grouting spacer (3) fit the inner wall of the grouting borehole (5), and separating the two ends of the grouting borehole (5); A cover plate (4) is installed at the grouting end of the orifice pipe (1), and a first grouting port is connected to the space between the cover plate (4) and the grouting spacer (3), and a second grouting port is connected to the feed end of the grouting conduit (2); injecting double liquid slurry into the space between the cover plate (4) and the grouting spacer (3) through the first grouting port; After the double-liquid slurry solidifies into a cement stone body, the filling slurry is poured into the grouting conduit (2) through the second grouting port.

8. The underground targeted grouting construction method according to claim 7, characterized in that: The injection pressure of the double-liquid slurry is 0.5 MPa.

9. The underground targeted grouting construction method according to claim 8, characterized in that: The ratio of water glass to calcium chloride solution in the double liquid slurry is 1:1.

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