Dam curtain grouting method and device

Abstract

The present invention discloses a dam curtain grouting method and device in the field of curtain grouting technology, including an orifice tube and a closure device, the closure device is fixedly installed at the bottom of the orifice tube, an isolation plug is provided for sliding inside the closure device, and a fixed sleeve is rotatably installed on the top, the outer ring of the closure device is connected to an outer expansion ring, the inner part of the outer expansion ring is connected to an inner conduit and the outer part is connected to a return slurry pipe; the inner conduit passes through the isolation plug and slides with it; a guide cylinder is provided at the bottom of the fixing sleeve and a pressure plate is provided for sliding inside, a seal is filled between the bottom of the pressure plate and the guide cylinder, a plurality of groups of clamping rods are rotatably connected to the inner wall of the fixing sleeve, a compression cylinder is provided with a thread on the top end of the fixing sleeve, and the compression cylinder is rotated downward to rotate the clamping rod downward to clamp the drill pipe while pressing the pressure plate to force the seal to deform; the seal, the fixing sleeve and other components of the present invention do not need to be exposed to the slurry, have a better sealing effect, the seal follows the rotation without wear, rotates smoothly, and at the same time increases the service life.

Description

Technical Field

[0001] The invention relates to the technical field of curtain grouting, in particular to a dam curtain grouting method and device. Background Art

[0002] Curtain grouting is the process of drilling holes in the ground using a geological drill to create a suitable curtain borehole, and then injecting cement slurry with high pressure into the hole. After the cement slurry is injected, it will gradually penetrate into the cracks and pores of the rock or soil layer, slowly solidify together, and gradually form a continuous whole with the borehole, eventually forming a water-blocking curtain. The water-blocking curtain is a grouting project that reduces seepage volume and reduces seepage pressure.

[0003] The curtain grouting of water conservancy dams is generally carried out in a preset corridor. At the same time, the curtain grouting of dams is generally deep, and most of them adopt the closed-hole circulation grouting method. Usually, segmented grouting from top to bottom is adopted to reach the required curtain grouting depth to obtain better water-stopping effect; that is to say, drilling and grouting are carried out alternately, and the cement slurry in the borehole is easy to solidify, and the drill rod cannot rotate flexibly, which can easily cause the drill rod to be stuck in the hole and cause accidents in the hole; during the rotation of the drill rod, the cylindrical base is in a stationary state, and friction will be generated when the drill rod and the sealing assembly rotate relative to each other, which makes the resistance to the rotation of the drill rod greater, and the sealing assembly is seriously worn, which can easily cause leakage, poor sealing and pressure release, affecting the grouting quality, and also making the service life of the sealing assembly shorter and the replacement frequency higher, affecting the normal construction progress.

[0004] Based on this, the present invention designs a dam curtain grouting method and device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a dam curtain grouting method and device to solve the problem proposed in the above background technology that during the rotation of the drill rod, the rotation resistance is large, the sealing component is severely worn, which easily causes leakage, poor sealing and pressure release, affecting the grouting quality, and also making the service life of the sealing component short and the replacement frequency high, affecting the normal construction progress.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: comprising an orifice pipe and a closure device, wherein the closure device is fixedly mounted on the bottom of the orifice pipe, an isolation plug is slidably mounted inside the closure device, and a fixed sleeve is rotatably mounted on the top of the closure device, the fixed sleeve is used to connect to the drill pipe and drive the drill pipe to rotate together, the outer ring of the closure device is connected to an outer expansion ring, the inner part of the outer expansion ring is connected to an inner guide tube, and the outer part of the outer expansion ring is connected to a slurry return pipe;

[0007] The isolation plug is located at the bottom of the closure and is used to isolate the bottom slurry from the upper space, and the inner conduit passes through the isolation plug and is slidably engaged with the isolation plug;

[0008] A guide cylinder is provided at the bottom of the fixed sleeve and a pressure plate is slidingly provided inside. A seal is filled between the bottom of the pressure plate and the guide cylinder. Multiple groups of clamping rods are rotatably connected to the inner wall of the fixed sleeve. A clamping cylinder is threadedly fitted on the top of the fixed sleeve. The clamping cylinder is rotated downward to rotate the clamping rod downward to clamp the drill rod and press down the pressure plate to force the seal to deform.

[0009] As a further solution of the present invention, a reinforcement plate is fixedly connected to the top of the orifice pipe, and the outer wall of the orifice pipe is tower-shaped. The orifice pipe is connected to the bottom flange of the closure through the reinforcement plate.

[0010] As a further solution of the present invention, a closed flare is provided at the top inner end of the orifice tube, a shrink ring is provided at the bottom of the closure, and a sealing gasket is installed between the closed flare and the shrink ring.

[0011] As a further solution of the present invention, a three-way hole is opened inside the isolation plug, and a filter is fixedly connected to the vertical hole section of the three-way hole. The filter is located above the transverse hole of the three-way hole. The side wall of the closure is connected to a multi-purpose tube. After the isolation plug is moved upward, the transverse hole of the three-way hole is connected to the multi-purpose tube.

[0012] As a further solution of the present invention, an extension ring is fixedly connected to the top of the pressure plate, an inner extension ring is fixedly connected to the bottom of the clamping cylinder, and the rod portion of the clamping rod is located between the extension ring and the inner extension ring.

[0013] As a further solution of the present invention, the sealing member includes a hollow deformable ring and an elastic sealing filler, the hollow deformable ring is located on the inner side, and the top and bottom ends of the hollow deformable ring are both arc-shaped arched surfaces.

[0014] As a further solution of the present invention, a mounting ring is fixedly connected to the top of the inner wall of the closure, the fixing sleeve is installed on the top of the mounting ring, the top of the closure is connected to a bearing cover through a flange, and bearing parts are installed between the bearing cover and the fixing sleeve and between the fixing sleeve and the mounting ring.

[0015] As a further solution of the present invention, the inner ring of the installation ring is provided with an opening that matches the taper of the guide cylinder, and a sealing rubber ring is provided between the two.

[0016] As a further solution of the present invention, the outer ring of the fixed sleeve is fixedly connected to an outer gear ring, and the fixed sleeve is driven to rotate by an external motor through gear transmission.

[0017] A dam curtain grouting method comprises the following steps:

[0018] After surveying and setting out, dig a hole that matches the bottom of the orifice pipe and bury the orifice pipe by mortaring;

[0019] Then install the sealer, insert the drill rod into the sealer, and drill the hole using a drilling rig;

[0020] After drilling is completed, the hole is cleaned and water pressure test is carried out; then preparation for grouting begins;

[0021] Rotate the clamping cylinder downward through the inner extension ring to press down and rotate the clamping rod, so that the clamping rod clamps the drill pipe. At the same time, the pressure plate moves downward to press the seal below, making the seal between the seal and the drill pipe tighter.

[0022] Connect the drill pipe and grouting pipe to the grouting pump and start grouting. During the grouting process, the drill pipe can be rotated by the drilling rig, and the fixed sleeve can rotate along with it under the clamping of the clamping rod;

[0023] At the initial stage of grouting, the air in the hole is discharged through the filter of the three-way hole until the hole is filled with slurry. The slurry pushes the isolation plug upward until the three-way hole is connected to the multi-purpose tube and the slurry is discharged. At this time, the hole is full of slurry and then the multi-purpose tube is closed.

[0024] Start circulating grouting. When the injection rate of the grouting hole section is no more than 1L / min under the maximum design pressure, continue grouting for 30 minutes and end the grouting.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The presence of the isolation plug allows the drill pipe to be sealed with the first seal while isolating the bottom slurry from the upper space, so that the seal, fixed sleeve and other components do not need to be exposed to the slurry, providing more friendly sealing conditions, making the closure and seal have a better sealing effect, and also providing good working conditions for the rotation of the fixed sleeve.

[0027] 2. The seal does not rotate relative to the drill pipe and there is no rotational wear. After the cyclic grouting is completed, the clamping rod and seal are released by loosening the clamping tube upwards. At this time, drilling can be continued while avoiding wear on the drill pipe and seal, which greatly increases the service life of the seal. It is very suitable for segmented grouting and can cope with the alternation of drilling and grouting. It has a good adaptability to deep grouting such as dam curtain grouting.

[0028] 3. Through the clamping connection of the clamping rod, the active rotation and passive rotation of the drill rod can be realized, and the fixed sleeve can rotate together, which can flexibly adapt to various production conditions on the site, save drilling rig investment and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention from a front perspective;

[0030] Figure 2 This is a schematic diagram of the overall structure of the present invention from a side-view perspective;

[0031] Figure 3 This is a schematic diagram of a partially enlarged structure of the present invention from a side view;

[0032] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0033] Figure 5 This is a schematic diagram of a half-section structure of the clamping rod of the present invention from a top view;

[0034] Figure 6 A schematic diagram of the structure of the present invention in a half-section from a side view and with details of part B magnified;

[0035] Figure 7 For the present invention Figure 6 Schematic diagram of the upward movement structure of the inner isolation plug in the middle B part;

[0036] Figure 8 This is a schematic structural diagram of the hollow deformation ring of the present invention before and after deformation.

[0037] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0038] 1. Orifice pipe; 2. Closer; 3. Isolation plug; 4. Fixed sleeve; 5. Drill pipe; 6. Outer expansion ring; 7. Inner guide tube; 8. Slurry return pipe; 9. Guide cylinder; 10. Pressure plate; 11. Seal; 12. Clamping rod; 13. Pressing cylinder; 14. Shrinkage ring; 15. Sealing gasket; 16. Tee; 17. Filter disc; 18. Multi-purpose tube; 19. Extension ring; 20. Inner extension ring; 111. Hollow deformation ring; 112. Sealing packing; 23. Mounting ring; 24. Bearing cover; 25. Outer gear ring. DETAILED DESCRIPTION

[0039] See also Figure 1-8 The working principle of the technical solution provided by the present invention is as follows:

[0040] After measurement and layout, a hole matching the bottom of the orifice pipe 1 is dug, and the orifice pipe 1 is buried by mortar embedding; since the orifice pipe 1 is a tower-shaped structure, it can effectively withstand a large grouting pressure during pressure grouting, thereby enhancing the stability of the orifice pipe 1.

[0041] The prepared sealing gasket 15 is installed in the orifice pipe 1, and then the closure device 2 is put on the reinforcement plate of the orifice pipe 1 and flange-connected. During the connection process, the closure device 2 gradually presses the sealing gasket 15, and the sealing of the closure device 2 and the orifice pipe 1 is achieved while the closure device 2 is installed and fixed. At the same time, the flange connection is more convenient, there is no problem of internal thread exposure or contamination, and the use of the closure device 2 is more durable.

[0042] Insert the drill rod 5 into the sealer and drill a hole using a drilling rig; after drilling, clean the hole and perform a water pressure test, and then prepare for grouting; at this time, it is necessary to ensure the seal between the drill rod 5 and the sealer 2 to ensure that the grouting pressure does not leak out; by rotating the clamping tube 13 downward through the inner extension ring 20 to press down and rotate the clamping rod 12, the clamping rod 12 clamps the drill rod 5, and at the same time, the pressure plate 10 moves downward to press the seal 11 below, so that the seal between the seal 11 and the drill rod 5 is tighter, thereby achieving a seal between the drill rod 5 and the sealer 2.

[0043] It should be noted that the presence of the isolation plug 3 allows the drill rod 5 to be sealed with the first seal while isolating the bottom slurry from the upper space, so that components such as the seal 11 and the fixed sleeve 4 do not have to be exposed to the slurry, providing more friendly sealing conditions, making the closure 2 have a better sealing effect, and also providing good working conditions for the rotation of the fixed sleeve 4.

[0044] Connect the drill rod 5 and the grouting pipe 8 to the grouting pump. First, tighten the compression cylinder 13 downward. During the downward movement of the compression cylinder 13, the inner extension ring 20 gradually moves downward, forcing the clamping rod 12 to rotate downward until the clamping rod 12 and the drill rod are in contact and clamped. At this time, the clamping rod 12 clamps the drill rod 5. At the same time, during the downward rotation of the clamping rod 12, the extension ring 19 presses the pressure plate 10 downward, thereby causing the pressure plate 10 to press the seal 11 more tightly and deform, thereby forming a reliable extrusion seal with the drill rod, greatly enhancing the sealing performance of the sealer 2.

[0045] The grouting is started by the drill pipe 5. At the initial stage of grouting, the filter disc 17 cannot pass the particles (filter cloth can be used to achieve this). During the grouting process, the air in the hole is gradually forced out by the slurry pressure, and then guided out through the filter disc 17 of the three-way hole 16 until the slurry in the hole reaches the isolation plug 3. Grouting is continued, and the slurry pushes the isolation plug 3 upward. When the isolation plug 3 just reaches the bend of the inner guide tube 7, the isolation plug 3 moves to the three-way hole 16 and is connected to the multi-use pipe 18, thereby discharging the slurry, indicating that the hole is full of slurry at this time, and the multi-use pipe 18 can be closed, so that the slurry in the hole can be clearly sensed when it is full. It is relatively simple and convenient. When the hole is full, it can be sensed immediately to avoid slurry waste and facilitate the start of formal circulation grouting. The valve installed on the multi-use pipe 18 can also be used as an overflow pipe in the future to adjust and control the circulation grouting pressure. At the same time, an overflow valve can also be set on the return slurry pipe 8.

[0046] During the grouting process, the drill rod 5 can be rotated by the drilling rig, and the fixing sleeve 4 is clamped by the clamping rod 12 so that the fixing sleeve 4 rotates along with the drill rod 5. At this time, the seal 11 does not rotate relative to the drill rod 5, and there is no rotational wear. The rotation of the fixing sleeve 4 is forcibly driven by the clamping of the clamping rod 12, so there is relatively no slipping between the drill rod 5 and the seal 11. After the cyclic grouting is completed, the clamping rod 12 and the seal 11 can be released by loosening the clamping cylinder 13 upwards. At this time, drilling can be continued. During the up and down movement of the drill rod 5, wear on the drill rod 5 and the seal 11 is avoided, which greatly increases the service life of the seal 11. It is very suitable for segmented grouting and can cope with the alternation of drilling and grouting. It has a good adaptability to deep grouting such as dam curtain grouting.

[0047] When the circulation grouting starts, the slurry is injected from the drill pipe 5, enters the outer expansion ring 6 through the inner guide tube 7, and then discharges the liquid through the return grout pipe 8 to realize the circulation grouting. The cooperation between the inner guide tube 7 and the isolation plug 3 ensures a good return grouting space during the return grouting, and at the same time provides the premise of isolating the slurry and the upper space. When the grouting hole section is under the maximum design pressure and the injection rate is not more than 1L / min, the grouting is continued for 30 minutes to end.

[0048] Specifically, the driving of the fixed sleeve 4 can be achieved by the drilling rig to rotate the drill rod 5, thereby driving the fixed sleeve 4 to rotate accordingly; in the last hole section, the drilling rig can also be withdrawn in advance, and the external motor can be used to transmit the gear through the outer gear ring 25 to make the fixed sleeve 4 actively rotate, thereby driving the drill rod 5 to rotate, avoiding pipe blockage, and through the clamping connection of the clamping rod 12, the active rotation and passive rotation of the drill rod 5 can be achieved. The fixed sleeve 4 can rotate together, flexibly adapting to various production conditions on the site, saving drilling rig investment and improving efficiency.

[0049] Specifically, when the pressure plate 10 is pressed downward, the hollow deformation ring 111 is deformed as follows: Figure 8 The left and right examples are shown, and the deformed one is the right one. The top and bottom planes of the hollow deformation ring 111 are flatter, the inner side is more prominent, and it is closer to the drill rod 5. At the same time, it has a better contact and sealing effect with the pressure plate 10 and the bottom seal. Under the elastic deformation of the external sealing filler 112, it fills the gap and provides uniform and comprehensive compression, further enhancing the overall sealing performance of the seal 11.

[0050] Specifically, the tapered guide cylinder 5 effectively guides the seal 11 downward when the pressure plate 10 compresses and deforms it, concentrating the seal's deformation downward and toward the center, thereby providing a better and tighter seal. It also effectively supports and vertically guides the drill rod 5. When the fixed sleeve 4 rotates, bearings are installed on both the top and bottom of its base, ensuring smooth rotation and a more sensitive and responsive follow-up of the fixed sleeve 4 and the drill rod 5.

Claims

1. A dam curtain grouting device, comprising an orifice tube (1) and a sealer (2), characterized in that: The closure (2) is fixedly mounted on the bottom of the orifice pipe (1); an isolation plug (3) is slidably mounted inside the closure (2); a fixed sleeve (4) is rotatably mounted on the top; the fixed sleeve (4) is used to connect to the drill rod (5) and drive the drill rod (5) to rotate together; the outer ring of the closure (2) is connected to an outer expansion ring (6); the inner part of the outer expansion ring (6) is connected to an inner guide tube (7) and the outer part is connected to a slurry return pipe (8); The isolation plug (3) is located at the bottom of the closure (2) and is used to isolate the bottom slurry from the upper space, and the inner conduit (7) passes through the isolation plug (3) and is slidably engaged with the isolation plug; The bottom of the fixed sleeve (4) is provided with a guide cylinder (9) and a pressure plate (10) is slidably provided inside. A seal (11) is filled between the bottom of the pressure plate (10) and the guide cylinder (9). The inner wall of the fixed sleeve (4) is rotatably connected to multiple groups of clamping rods (12). The top thread of the fixed sleeve (4) is fitted with a clamping cylinder (13). The clamping cylinder (13) is rotated downward to rotate the clamping rod (12) downward to clamp the drill rod (5) and at the same time press the pressure plate (10) to force the seal (11) to deform.

2. A dam curtain grouting device according to claim 1, characterized in that: The top of the orifice pipe (1) is fixedly connected to a reinforcement plate, and the outer wall of the orifice pipe (1) is tower-shaped. The orifice pipe (1) is connected to the bottom flange of the closure (2) via the reinforcement plate.

3. A dam curtain grouting device according to claim 2, characterized in that: The top end of the orifice tube (1) is provided with a closed flare, the bottom of the closure (2) is provided with a shrink ring (14), and a sealing gasket (15) is installed between the closed flare and the shrink ring (14).

4. The dam curtain grouting device according to claim 1, characterized in that: A three-way hole (16) is provided inside the isolation plug (3), a filter disc (17) is fixedly connected to the vertical hole section of the three-way hole (16), and the filter disc (17) is located above the transverse hole of the three-way hole (16). The side wall of the closure (2) is connected to a multi-purpose tube (18), and when the isolation plug (3) moves upward, the transverse hole of the three-way hole (16) is connected to the multi-purpose tube (18); The top of the pressure plate (10) is fixedly connected to an extension ring (19), the bottom of the pressing cylinder (13) is fixedly connected to an inner extension ring (20), and the rod portion of the clamping rod (12) is located between the extension ring (19) and the inner extension ring (20).

5. The dam curtain grouting device according to claim 1, characterized in that: The sealing member (11) comprises a hollow deformable ring (111) and an elastic sealing filler (112); the hollow deformable ring (111) is located on the inner side; the top and bottom ends of the hollow deformable ring (111) are both arc-shaped arched surfaces.

6. The dam curtain grouting device according to claim 1, characterized in that: The top of the closure (2) is fixedly connected to a mounting ring (23), the fixing sleeve (4) is mounted on the top of the mounting ring (23), the top of the closure (2) is connected to a bearing cover (24) via a flange, and bearings are mounted between the bearing cover (24) and the fixing sleeve (4), and between the fixing sleeve (4) and the mounting ring (23).

7. A dam curtain grouting device according to claim 6, characterized in that: The inner ring of the mounting ring (23) is provided with an opening that matches the taper of the guide cylinder (9), and a sealing rubber ring is provided between the two.

8. The dam curtain grouting device according to claim 1, characterized in that: The outer ring of the fixed sleeve (4) is fixedly connected to an outer gear ring (26), and the fixed sleeve (4) is driven to rotate by an external motor via gear transmission.

9. A dam curtain grouting method, comprising a grouting device according to claim 4, characterized in that: The following steps are involved: S1: After measuring and setting out, dig a hole that matches the bottom of the orifice pipe (1), and bury the orifice pipe (1) by mortar laying; S2: Then install the sealer (2), insert the drill rod (5) into the sealer, and drill the hole using a drilling rig; S3: After drilling is completed, the hole is cleaned and water pressure test is carried out; then preparation for grouting begins; S4: Rotate the pressing cylinder (13) downward through the inner extension ring (20) to press down the rotating clamping rod (12), so that the clamping rod (12) clamps the drill rod (5), and at the same time, the pressure plate (10) moves downward to press the lower seal (11), so that the seal between the seal (11) and the drill rod (5) is tighter; S5: Connect the drill rod (5) and the grouting pipe (8) to the grouting pump and start grouting. During the grouting process, the drill rod (5) can be rotated by the drilling rig, and the fixed sleeve (4) can be rotated together with the clamping rod (12); S6: At the initial stage of grouting, the air in the hole is discharged through the filter (17) of the three-way hole (16) until the hole is filled with slurry. The slurry pushes the isolation plug (3) upward until the three-way hole (16) is connected to the multi-purpose tube (18) and the slurry is discharged. At this time, the hole is filled with slurry, and then the multi-purpose tube (18) is closed; S7: Start circulating grouting. When the injection rate of the grouting hole section is no more than 1L / min under the maximum design pressure, continue grouting for 30 minutes and end the grouting.

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