A grouting sand filtering and pressure stabilizing device for caprock and fault fracture zone

Abstract

The application discloses a kind of covering layer and fault fracture zone grouting sand filtering pressure stabilizing device, including outer tube, inner tube, drive assembly and with the inner cavity of outer tube communication's pressure tank, the both ends of outer tube are detachably installed with connecting seat and mounting seat respectively, mounting seat is opened with and outer tube inner cavity communication's grout inlet hole, inner tube is coaxially arranged with grout inlet hole, a plurality of filter holes are opened on inner tube, grout outlet hole is opened on the outer wall of outer tube;Spiral groove is formed on the inner wall of inner tube along its extension direction, one end of inner tube is rotationally arranged on connecting seat and forms sand outlet, adjusting valve is arranged on connecting seat.The pressure inside outer tube can be guaranteed by pressure tank, the stability of grouting pressure is improved, and the safety risks such as rupture of grouting pipeline due to pressure fluctuation are avoided;Through drive assembly and spiral groove on inner tube, automatic cleaning of sand and gravel can be realized, it is convenient to use, the labor intensity of construction personnel is reduced, and work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of geological strata hardening treatment technology, and in particular to a grouting and sand stabilization device for overburden and fault fracture zones. Background Technology

[0002] In water conservancy and hydropower projects, seepage prevention is a crucial step, and grouting technology is one of the commonly used techniques in seepage prevention, widely applied in my country. However, in seepage prevention, overburden or fault fracture zones are often weak points and challenging areas. Therefore, a "top-down, orifice-sealed, in-hole circulation" grouting method is typically used. However, when applied to overburden or fault fracture zones, the circulating grout can carry away some sand and gravel from the strata, easily causing pump and pipe blockage, pressure instability, and other problems. Therefore, filtering the circulating grout is necessary.

[0003] The applicant obtained the following prior art through searching, specifically, patent publication number CN219825332U discloses a curtain grouting borehole return water diversion device, relating to the field of geotechnical engineering construction technology. It solves the problem in existing curtain grouting borehole return water directional diversion devices where return water containing rock powder and drill cuttings easily clogs the diversion pipe or hose during use. The key technical points are: it includes a booster pipe and a cavity. A filter screen is installed inside the cavity, dividing the cavity into a raw liquid chamber and a clean liquid chamber. An inlet pipe is installed on the raw liquid chamber, and an outlet pipe is installed on the clean liquid chamber. The inlet pipe of the cavity is connected to the booster pipe, which is connected to the upper end of the curtain grouting pipe. Through this structure, during the curtain grouting drilling process, the return water containing rock powder and drill cuttings enters the cavity from the booster pipe, is filtered by the filter screen, flows out from the outlet pipe on the cavity, and is then discharged by the diversion pipe. This achieves the goal of filtering rock powder and drill cuttings in the borehole return water through the cavity, thus preventing the return water from clogging the drainage pipe or drainage hose.

[0004] As can be seen from the patent above, although this curtain grouting borehole return water diversion device can filter rock powder and drill cuttings in the borehole return water, effectively preventing the return water from clogging the diversion pipe or hose, after long-term use, the end cap needs to be disassembled and the filter screen manually cleaned, which increases the labor intensity of construction personnel, reduces work efficiency, and is inconvenient to use. At the same time, during the grouting process, grouting plugs are needed to block the grouting holes to ensure grouting pressure. However, when the circulating grout in the hole flows back, it is easy to cause unstable grouting pressure and fluctuations. However, the existing grouting sand filter device can only filter the circulating grout in the hole, but cannot guarantee the grouting pressure, which can easily lead to safety risks such as rupture of the grouting pipeline and reduce the grouting effect. Summary of the Invention

[0005] The main objective of this invention is to provide a pressure stabilizing device for grouting and filtering sand in the cover layer and fault fracture zone. This device aims to solve the problems of existing grouting and filtering sand devices, which require disassembly of end caps and manual cleaning of the filter screen after long-term use. This increases the labor intensity of construction workers, reduces work efficiency, is inconvenient to use, and cannot guarantee grouting pressure, which can easily lead to safety risks such as rupture of grouting pipelines and reduce grouting effect.

[0006] To achieve the above objectives, the present invention provides a grouting and sand stabilizing device for overburden and fault fracture zones, comprising an outer pipe, an inner pipe, a drive assembly, and a pressure stabilizing tank communicating with the inner cavity of the outer pipe. The outer pipe has a connecting seat and a mounting seat for mounting the drive assembly detachably installed at both ends. The mounting seat has a grout inlet hole communicating with the inner cavity of the outer pipe. The inner pipe is located inside the outer pipe and coaxially arranged with the grout inlet hole, and has a plurality of filter holes. The outer wall of the outer pipe has a grout outlet hole. The drive assembly drives the inner pipe to rotate relative to the outer pipe. A spiral groove is formed on the inner wall of the inner pipe along its extension direction. The end of the inner pipe away from the drive assembly is rotatably mounted on the connecting seat and forms a sand outlet. The connecting seat is provided with a regulating valve for opening or closing the sand outlet.

[0007] Preferably, a pressure gauge for detecting the pressure inside the outer tube is provided on the outer wall of the outer tube.

[0008] Preferably, at least two spiral grooves are formed on the inner wall of the inner tube along its extension direction, and the installation angle β of any one of the spiral grooves is 55° to 65°.

[0009] Preferably, a fixed seat for sealing the inner cavity of the outer tube is provided between the mounting base and the outer tube. A movable seat for connecting with the inner tube is rotatably mounted on the fixed base. The movable seat has a through hole for slurry to pass through. The drive assembly includes a bracket, a motor, a drive gear, and a driven gear. The bracket is detachably mounted on the mounting base and used to mount the motor. The output shaft of the motor is connected to the drive gear. The driven gear is sleeved on the movable seat. The mounting base has a notch so that the drive gear can mesh with the driven gear through the notch.

[0010] Preferably, the through hole and the slurry inlet hole are coaxially arranged, and the slurry inlet hole is gradually narrowed along the extension direction of the inner tube, while the through hole is gradually widened at the end near the inner tube.

[0011] Preferably, the diameter of the driven gear is larger than the diameter of the driving gear, and a plurality of rolling elements are provided between the movable seat and the fixed seat.

[0012] Preferably, the pressure stabilizing tank has a gas-liquid inlet for communicating with an external gas supply device and a water supply device, and a control valve for opening or closing the gas-liquid inlet is provided at the gas-liquid inlet.

[0013] Preferably, the connecting seat is sealed to the outer pipe by a clamp, and the end of the regulating valve away from the connecting seat is used for detachable connection with an external sand collection device.

[0014] Preferably, a plurality of support frames are provided at intervals and equal distances along the extension direction on the outer wall of the outer tube, and the plurality of support frames are detachably connected to the outer tube.

[0015] Preferably, at least two of the grout outlet holes are spaced apart along the extension direction of the outer pipe, and the opening of any of the grout outlet holes is arranged downward and is used for detachable connection with the grout return pipe.

[0016] Beneficial effects:

[0017] 1. The present invention provides a pressure stabilizing device for grouting and filtering sand in the covering layer and fault fracture zone. By filling the pressure stabilizing tank with high-pressure gas, the pressure inside the outer pipe can be guaranteed. At this time, the present invention acts as a pressure buffer valve in the entire grouting circuit. It can not only ensure the stability of grouting pressure and avoid safety risks such as rupture of grouting pipeline due to pressure fluctuation, but also improve the grouting effect and is reliable in use.

[0018] 2. The present invention provides a grouting and sand stabilizing device for a covering layer and fault fracture zone. The device drives the inner tube to rotate through a drive component, so that the spiral groove on the inner wall of the inner tube can discharge sand and gravel from the sand outlet, thereby achieving automatic cleaning of sand and gravel without the need for manual operation by construction personnel. It is convenient to use, reduces the labor intensity of construction personnel, and improves work efficiency.

[0019] 3. In the present invention, when the grouting and sand filtering pressure stabilizing device for the overburden layer and fault fracture zone is in use, the grout flows back into the grouting circuit through several filter holes on the inner pipe and through the grout outlet hole on the outer pipe. At this time, the sand and gravel carried out by the grout cannot pass through the filter holes due to their size and remain in the inner pipe, thereby achieving grout filtration and effectively avoiding construction accidents such as pump blockage and pipe blockage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is an isometric view of a capping layer and a grouting and filtering sand stabilizing device for fault fracture zones according to an embodiment of the present invention;

[0022] Figure 2 This is a front view of a grouting and sand-filtering pressure-stabilizing device for a cover layer and a fault fracture zone, according to an embodiment of the present invention.

[0023] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0024] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0025] Figure 5 This is a schematic diagram of the spiral groove in a grouting and sand stabilizing device for a cover layer and a fault fracture zone according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the drive component in a grouting and sand stabilizing device for a cover layer and a fault fracture zone according to an embodiment of the present invention.

[0027] Figure 7 This invention relates to a grouting and sand filtering device for a cover layer and fault fracture zone applied to the Shuangjiangkou Hydropower Station. Specifically, it refers to the sand and gravel filtered out by the circulating grout when the grouting hole depth is 6m-8.7m.

[0028] Figure 8 This invention relates to a grouting and sand filtering device for a cover layer and fault fracture zone applied to the Shuangjiangkou Hydropower Station. Specifically, it refers to the sand and gravel filtered out by the circulating grout when the grouting hole depth is 15m-20.9m.

[0029] In the diagram: 1-Outer pipe; 2-Inner pipe; 3-Drive assembly; 4-Pressure stabilizing tank; 5-Connecting seat; 6-Mounting seat; 7-Pulp inlet; 8-Filter hole; 9-Pulp outlet; 10-Spiral groove; 11-Sand outlet; 12-Regulating valve; 13-Pressure gauge; 14-Fixed seat; 15-Moving seat; 16-Through hole; 17-Bracket; 18-Motor; 19-Drive gear; 20-Driven gear; 21-Notch; 22-Rolling element; 23-Gas-liquid inlet; 24-Control valve; 25-Support frame. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0035] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Example 1:

[0037] This invention proposes a pressure stabilizing device for grouting and filtering sand in the cover layer and fault fracture zone.

[0038] In one embodiment of the present invention, a grouting and sand stabilizing device for a cover layer and fault fracture zone includes an outer pipe 1, an inner pipe 2, a drive assembly 3, and a pressure stabilizing tank 4 communicating with the inner cavity of the outer pipe 1. The two ends of the outer pipe 1 are respectively detachably mounted with a connecting seat 5 and a mounting seat 6 for mounting the drive assembly 3. The mounting seat 6 is provided with a grout inlet hole 7 communicating with the inner cavity of the outer pipe 1. The inner pipe 2 is located inside the outer pipe 1 and is coaxially arranged with the grout inlet hole 7. The inner pipe 2 is provided with a plurality of filter holes 8. The outer wall of the outer pipe 1 is provided with a grout outlet hole 9. The drive assembly 3 is used to drive the inner pipe 2 to rotate relative to the outer pipe 1. The inner wall of the inner pipe 2 is formed with a spiral groove 10 along its extension direction. The end of the inner pipe 2 away from the drive assembly 3 is rotatably mounted on the connecting seat 5 and forms a sand outlet 11. The connecting seat 5 is provided with a regulating valve 12 for opening or closing the sand outlet 11.

[0039] Specifically, such as Figures 1 to 4 As shown, in the grouting and sand filtering pressure stabilization device for the cover layer and fault fracture zone of the present invention, one end of the outer pipe 1 is detachably equipped with a mounting base 6. The detachable connection can be a threaded connection as in the prior art, which facilitates the disassembly of the mounting base 6. Furthermore, since the mounting base 6 has a grout inlet hole 7, and the inner pipe 2 is located inside the outer pipe 1 and coaxially arranged with the grout inlet hole 7, by connecting the mounting base 6 to the grouting circuit, the grout can flow into the inner pipe 2 through the grout inlet hole 7. At the same time, since the inner pipe 2 has a number of filter holes 8 along its extension direction, the grout can flow out of the inner pipe 2 through the filter holes 8 and flow back into the grouting circuit through the grout outlet hole 9 on the outer pipe 1. At this time, the sand and gravel carried out by the grout cannot pass through the filter holes 8 due to their size and remain in the inner pipe 2, thereby achieving grout filtration and effectively avoiding construction accidents such as pump blockage and pipe blockage.

[0040] Understandably, during grouting, the drive assembly 3 on the mounting base 6 drives the inner pipe 2 to rotate relative to the outer pipe 1, and the other end of the outer pipe 1 is detachably mounted with a connecting seat 5. The end of the inner pipe 2 away from the drive assembly 3 is rotatably mounted on the connecting seat 5, thereby ensuring the smooth rotation of the inner pipe 2. At the same time, since a spiral groove 10 is formed on the inner wall of the inner pipe 2 along its extension direction, the operator controls the regulating valve 12 on the connecting seat 5 to open the sand outlet 11, so that the sand and gravel left in the inner pipe 2 can be discharged from the sand outlet 11 under the rotation of the spiral groove 10, realizing automatic cleaning of the sand and gravel without the need for manual operation by the construction personnel. It is convenient to use, reduces the labor intensity of the construction personnel, and improves work efficiency.

[0041] It is worth noting that, since the pressure stabilizing tank 4 is connected to the inner cavity of the outer pipe 1, during the grouting process, high-pressure gas is filled into the pressure stabilizing tank 4 to ensure the pressure inside the outer pipe 1. That is, when the pressure increases, the pressure stabilizing tank 4 can absorb and buffer this pressure surge, thereby reducing the impact of pressure fluctuations on the system. Conversely, when the system pressure decreases, the pressure stabilizing tank 4 can apply pressure to the inner cavity of the outer pipe 1. In this case, the invention acts as a pressure buffer valve in the entire grouting circuit, thus not only ensuring the stability of the grouting pressure and avoiding safety risks such as rupture of the grouting pipeline due to pressure fluctuations, but also improving the grouting effect. Actual usage results show that even at high grouting pressures exceeding 3 MPa, the invention can still effectively ensure pressure stability during the grouting process, reduce construction safety risks, and is reliable in use.

[0042] Furthermore, in practical applications, taking the Shuangjiangkou Hydropower Station as an example, a 300m-class gravel-soil core rockfill dam, the world's highest dam, the fault fracture zone has extremely high requirements for seepage prevention. The fault fracture zone has a significant impact on dam foundation leakage and seepage stability; therefore, grouting and seepage prevention treatment of the fault fracture zone is particularly important. For example... Figure 7 and Figure 8 As shown, during the grouting process, the circulating grout in the borehole will carry out some gravel from the fault fracture zone. Because the gravel in the grouting circuit can easily cause a series of problems such as pump blockage, pipe blockage, and unstable pressure, it will cause great difficulties in the implementation of the grouting process. However, the present invention can effectively avoid problems such as pump blockage, pipe blockage, and unstable pressure in the grouting circuit, and ensure the smooth implementation of grouting and seepage prevention treatment in the fault fracture zone. It can provide a reference for similar overburden and fault fracture zone grouting construction projects in the future.

[0043] Compared with the prior art, the grouting and sand filtering pressure stabilizing device of the present invention, which fills the pressure stabilizing tank 4 with high-pressure gas, can ensure the pressure inside the outer pipe 1. At this time, the present invention acts as a pressure buffer valve in the entire grouting circuit, which not only ensures the stability of the grouting pressure and avoids safety risks such as rupture of the grouting pipeline due to pressure fluctuation, but also improves the grouting effect and is reliable in use. The drive component 3 drives the inner pipe 2 to rotate, so that the spiral groove 10 on the inner wall of the inner pipe 2 can discharge the sand and gravel from the sand outlet 11, realizing automatic cleaning of the sand and gravel without the need for manual operation by construction personnel. It is convenient to use, reduces the labor intensity of construction personnel, and improves work efficiency. The grout flows back into the grouting circuit through several filter holes 8 on the inner pipe 2 and grout outlet 9 on the outer pipe 1. At this time, the sand and gravel carried out by the grout cannot pass through the filter holes 8 due to their size and remain in the inner pipe 2, thereby achieving grout filtration and effectively avoiding construction accidents such as pump blockage and pipe blockage.

[0044] In one embodiment, a pressure gauge 13 for detecting the pressure inside the outer tube 1 is provided on the outer wall of the outer tube 1. Specifically, as shown... Figure 1 As shown, the pressure inside the outer tube 1 can be viewed directly through pressure gauge 13, which makes it easy for construction personnel to adjust and convenient to use.

[0045] In one embodiment, at least two helical grooves 10 are formed on the inner wall of the inner tube 2 along its extending direction, and the installation angle β of any helical groove 10 is 55° to 65°. Specifically, as shown... Figure 3 and Figure 5 As shown, since at least two spiral grooves 10 are formed on the inner wall of the inner tube 2 along its extension direction, the conveying efficiency of sand and gravel can be improved, allowing the sand and gravel to be discharged from the sand outlet 11 in a timely manner, ensuring reliable use. Understandably, the larger the installation angle β of the spiral groove 10, the larger the angle between the spiral groove 10 and the rotation axis. If the installation angle β of the spiral groove 10 is too large, sand and gravel will remain between two adjacent spiral grooves 10, thus preventing effective conveying of the sand and gravel. Similarly, the smaller the installation angle β of the spiral groove 10, the smaller the angle between the spiral groove 10 and the rotation axis. If the installation angle β of the spiral groove 10 is too small, it is easy to cause blockage of sand and gravel, reducing the continuity of sand and gravel conveying. Therefore, in this invention, the installation angle β of any spiral groove 10 is 55° to 65°, thereby ensuring continuous conveying of sand and gravel, allowing the sand and gravel to be discharged from the sand outlet 11 from the inner tube 2 in a timely manner. The structural design is simple and reasonable.

[0046] In one embodiment, a fixed seat 14 for sealing the inner cavity of the outer tube 1 is provided between the mounting base 6 and the outer tube 1. A movable seat 15 for connecting with the inner tube 2 is rotatably mounted on the fixed seat 14. A through hole 16 for supplying slurry is provided on the movable seat 15. The drive assembly 3 includes a bracket 17, a motor 18, a drive gear 19 and a driven gear 20. The bracket 17 is detachably mounted on the mounting base 6 and is used to mount the motor 18. The drive gear 19 is connected to the output shaft of the motor 18. The driven gear 20 is sleeved on the movable seat 15. A notch 21 is provided on the mounting base 6 so that the drive gear 19 meshes with the driven gear 20 through the notch 21.

[0047] Specifically, such as Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, the fixed seat 14 separates the inner cavity of the outer tube 1 from the inner cavity of the mounting seat 6, thus ensuring the sealing of the inner cavity of the outer tube 1 and preventing slurry leakage, while also preventing slurry from flowing into the mounting seat 6 and contacting the motor 18, causing damage. Furthermore, since the movable seat 15 is rotatably mounted on the fixed seat 14 and used to connect with the inner tube 2, and the movable seat 15 is fitted with a driven gear 20, and the mounting seat 6 has a notch 21, the driving gear 19 on the output shaft of the motor 18 meshes with the driven gear 20 through the notch 21, so that the movable seat 15 and the inner tube 2 can rotate synchronously under the drive of the motor 18, thereby achieving stable conveying of gravel. The structural design is simple and reasonable.

[0048] In one embodiment, the through hole 16 and the slurry inlet hole 7 are coaxially arranged, and the slurry inlet hole 7 is gradually narrowed along the extension direction of the inner tube 2, while the through hole 16 is gradually widened at the end near the inner tube 2. It can be understood that, as Figure 3 and Figure 4 As shown, after the movable seat 15 is installed on the fixed seat 14, the through hole 16 on the movable seat 15 is coaxially arranged with the slurry inlet hole 7 on the mounting seat 6. The slurry inlet hole 7 is gradually narrowed from left to right, and the right end of the through hole 16 is gradually widened. This allows the slurry to flow smoothly into the inner pipe 2 through the slurry inlet hole 7 and the through hole 16, avoiding the blockage caused by sand and gravel in the slurry inlet hole 7 or the through hole 16. The structural design is simple and reasonable.

[0049] In another embodiment, the through hole 16 and the slurry inlet hole 7 are coaxially arranged, and the cross-sectional dimensions of the through hole 16 and the slurry inlet hole 7 are equal. It can be understood that by providing through holes 16 and slurry inlet holes 7 of equal size, it is also possible to ensure that the slurry flows smoothly into the inner pipe 2.

[0050] In one embodiment, the driven gear 20 has a larger diameter than the driving gear 19, and a plurality of rolling elements 22 are provided between the movable seat 15 and the fixed seat 14. Understandably, because the driven gear 20 has a larger diameter than the driving gear 19, the rotational speed of the inner tube 2 can be reduced, allowing it to effectively filter sand and gravel during rotation, ensuring reliable operation. Furthermore, the plurality of rolling elements 22 provided between the movable seat 15 and the fixed seat 14 can be selected as rolling bearings in the prior art. The rolling bearings reduce friction between the movable seat 15 and the fixed seat 14, making the movable seat 15 rotate more smoothly and facilitating the filtration of the slurry.

[0051] In one embodiment, the pressure stabilizing tank 4 has a gas-liquid inlet 23 for communication with an external gas supply device and a water supply device, and a control valve 24 for opening or closing the gas-liquid inlet 23 is provided at the gas-liquid inlet 23. It can be understood that, as Figure 1 and Figure 3As shown, when grouting is required, the construction personnel connect the gas-liquid inlet 23 to an external gas supply device, which can be a large-capacity gas storage tank as in the prior art. The construction personnel open the control valve 24 and simultaneously open the gas-liquid inlet 23 to achieve gas filling of the pressure stabilizing tank 4 and pressure stabilization of the grouting circuit. When grouting is not being performed, the construction personnel connect the gas-liquid inlet 23 to an external water supply device, which can be a water storage tank as in the prior art. The construction personnel open the control valve 24 and simultaneously open the gas-liquid inlet 23. At this time, the water in the water storage tank can flow into the pressure stabilizing tank 4 and then into the outer pipe 1, thereby achieving the cleaning operation of the inner cavity of the outer pipe 1. At the same time, it can also prevent the residual grout in the outer pipe 1 from solidifying on the inner wall of the outer pipe 1 when the invention is not in use, ensuring reliable use.

[0052] In one embodiment, the connecting seat 5 is sealed to the outer pipe 1 by a clamp, and the end of the adjusting valve 12 away from the connecting seat 5 is used for detachable connection to an external sand collecting device. It can be understood that, as Figures 1 to 3 As shown, since the connecting seat 5 is sealed to the outer pipe 1 by a clamp, it is not only easy to disassemble and assemble the connecting seat 5, but also ensures the sealing of the outer pipe 1. Furthermore, during the use of this invention, the construction personnel open the regulating valve 12. Since the end of the regulating valve 12 away from the connecting seat 5 is detachably connected to the external sand collecting device, the external sand collecting device can be a storage container with an interface in the prior art. By connecting the end of the regulating valve 12 away from the connecting seat 5 to the interface of the storage container, the discharged sand and gravel can be collected, which is convenient for secondary use and reduces environmental pollution.

[0053] In one embodiment, a plurality of support frames 25 are provided at equal intervals along the extending direction on the outer wall of the outer tube 1, and all the support frames 25 are detachably connected to the outer tube 1. Specifically, as shown in the figure... Figure 1 As shown, the outer tube 1 can be supported and limited at multiple points by a number of support frames 25, thereby improving the installation stability of the present invention. Furthermore, since the support frames 25 are all detachably connected to the outer tube 1, the detachable connection can be a clamp connection, which facilitates the disassembly and assembly of the present invention and is convenient for maintenance and replacement.

[0054] In one embodiment, specifically, as Figure 1 and Figure 3 As shown, at least two grout outlet holes 9 are spaced apart along the extension direction of the outer pipe 1, and the opening of any grout outlet hole 9 is set downward and used for detachable connection with the grout return pipe, thereby avoiding the accumulation of filtered grout in the outer pipe 1 and improving the return efficiency of filtered grout. The structural design is simple and reasonable.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for grouting and sand filtering and pressure stabilizing in caprock and fault fracture zone, characterized in that, The device includes an outer tube (1), an inner tube (2), a drive assembly (3), and a pressure stabilizing tank (4) communicating with the inner cavity of the outer tube (1). A connecting seat (5) and a mounting seat (6) for mounting the drive assembly (3) are detachably installed at both ends of the outer tube (1). The mounting seat (6) has a slurry inlet hole (7) communicating with the inner cavity of the outer tube (1). The inner tube (2) is located inside the outer tube (1) and coaxially arranged with the slurry inlet hole (7). The inner tube (2) has several filters. Hole (8), and a slurry outlet hole (9) is provided on the outer wall of the outer tube (1); the driving assembly (3) is used to drive the inner tube (2) to rotate relative to the outer tube (1), and a spiral groove (10) is formed on the inner wall of the inner tube (2) along its extension direction. The end of the inner tube (2) away from the driving assembly (3) is rotatably set on the connecting seat (5) and forms a sand outlet (11). The connecting seat (5) is provided with a regulating valve (12) for opening or closing the sand outlet (11). At least two spiral grooves (10) are formed on the inner wall of the inner tube (2) along its extension direction, and the installation angle β of any one of the spiral grooves (10) is 55° to 65°. The pressure stabilizing tank (4) has a gas-liquid inlet (23) for communicating with an external gas supply device and a water supply device, and a control valve (24) for opening or closing the gas-liquid inlet (23) is provided at the gas-liquid inlet (23).

2. The grouting and sand-filtering pressure-stabilizing device for a cover layer and fault fracture zone according to claim 1, characterized in that, A pressure gauge (13) for detecting the pressure inside the outer tube (1) is provided on the outer wall of the outer tube (1).

3. The grouting and sand-filtering pressure-stabilizing device for a cover layer and fault fracture zone according to claim 2, characterized in that, A fixed seat (14) for sealing the inner cavity of the outer tube (1) is provided between the mounting base (6) and the outer tube (1). A movable seat (15) for connecting with the inner tube (2) is rotatably mounted on the fixed seat (14). A through hole (16) for slurry to pass through is provided on the movable seat (15). The drive assembly (3) includes a bracket (17), a motor (18), a drive gear (19), and a driven gear (20). The bracket (17) is detachably mounted on the mounting base (6) and used to mount the motor (18). The output shaft of the motor (18) is connected to the drive gear (19). The driven gear (20) is sleeved on the movable seat (15). A notch (21) is provided on the mounting base (6) so that the drive gear (19) meshes with the driven gear (20) through the notch (21).

4. The grouting and sand-filtering pressure-stabilizing device for a cover layer and fault fracture zone according to claim 3, characterized in that, The through hole (16) is coaxially arranged with the slurry inlet hole (7), and the slurry inlet hole (7) is gradually narrowed along the extension direction of the inner tube (2), while the through hole (16) is gradually widened at one end near the inner tube (2).

5. The grouting and sand-filtering pressure-stabilizing device for a cover layer and fault fracture zone according to claim 3, characterized in that, The diameter of the driven gear (20) is larger than the diameter of the driving gear (19), and a plurality of rolling elements (22) are provided between the movable seat (15) and the fixed seat (14).

6. A grouting and filter sand stabilizing device for a cover layer and fault fracture zone according to any one of claims 1-5, characterized in that, The connecting seat (5) is sealed to the outer tube (1) by a clamp, and the end of the regulating valve (12) away from the connecting seat (5) is used for detachable connection with the external sand collection device.

7. A grouting and filter sand stabilizing device for a cover layer and fault fracture zone according to any one of claims 1-5, characterized in that, The outer wall of the outer tube (1) is provided with a plurality of support frames (25) spaced apart and equidistantly along its extension direction, and the plurality of support frames (25) are detachably connected to the outer tube (1).

8. A grouting and filter sand stabilizing device for a cover layer and fault fracture zone according to any one of claims 1-5, characterized in that, At least two of the grout outlet holes (9) are spaced apart along the extension direction of the outer tube (1), and the opening of any of the grout outlet holes (9) is arranged downward and is used for detachable connection with the grout return pipe.

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