Construction method for repairing pile sediment defects by high air pressure cleaning and closed grouting filling

Abstract

This invention relates to the technical field of bored piles, and discloses a construction method for high-pressure cleaning and sealing grouting repair of sediment defects in bored piles, including the following construction steps: 1) The bored pile has a sediment zone; a core extraction hole is drilled in the bored pile; 2) High-pressure gas is injected into the core extraction hole to achieve sediment cleaning and replacement in the sediment zone; 3) A sealing device is inserted into the core extraction hole; the sealing device has a grouting channel, a grout outlet, a grouting port, a grouting channel, and a grout stop valve, and grouting fluid is injected into the core extraction hole through a grouting pump to perform replacement grouting; 4) Grouting fluid is injected into the core extraction hole through a grouting pump to perform sealing high-pressure grouting; 5) The sealing device is removed from the core extraction hole, and grouting fluid is injected into the core extraction hole to perform supplementary grouting until the grouting fluid overflows from the core extraction hole; This method solves the problems of incomplete sediment treatment, insufficient grouting filling, and time-consuming repair, and improves the repair effect of sediment defects in bored piles.

Description

Technical Field

[0001] This invention relates to the technical field of bored piles, and more specifically, to a construction method for high-pressure cleaning and sealing grouting to repair sediment defects in bored piles. Background Technology

[0002] As an important type of foundation, cast-in-place piles have been widely used in infrastructure fields such as bridge engineering and high-rise buildings.

[0003] However, during construction, the quality defect of excessive sediment thickness at the bottom of the cast-in-place piles has always been a difficult point in the project quality. If the sediment is not completely removed, it will form a weak interlayer, causing the pile foundation to settle too much under load.

[0004] In existing technologies, the repair of sediment defects in cast-in-place piles typically employs a combination of high-pressure jet grouting and hole washing. This method involves using air pressure or high-pressure water to wash the hole, followed by injecting ordinary cement grout as the filling fluid.

[0005] Because the flow path of the medium in the high-pressure jet grouting hole is difficult to control, the cleaning effect is limited. Especially when the adhesion between the sediment area and the bedrock interface is weak and the space at the bottom of the hole is limited, sediment is easy to remain, resulting in incomplete grouting in the subsequent process and the repair effect is difficult to meet the requirements.

[0006] Moreover, ordinary cement grout is difficult to completely fill sediment areas in complex strata, especially when the porosity is low. Due to inaccurate control of grouting pressure, grout can easily be lost or partially unfilled, making it difficult to guarantee the integrity of grouting and the repair effect. Summary of the Invention

[0007] The purpose of this invention is to provide a construction method for high-pressure cleaning and sealing grouting to repair sediment defects in cast-in-place piles, aiming to solve the problem of poor repair effect of sediment defects in cast-in-place piles in the prior art.

[0008] This invention is implemented as follows: a construction method for high-pressure cleaning and sealing grouting to repair sediment defects in cast-in-place piles, comprising the following construction steps: 1) The bottom of the cast-in-place pile has a sediment zone containing sediment; a core-pulling hole is drilled in the cast-in-place pile, the top of the core-pulling hole penetrates the top of the cast-in-place pile, and the bottom of the core-pulling hole extends to the sediment zone. 2) High-pressure gas is injected into the core-pulling hole, and the water in the core-pulling hole overflows and is discharged from the core-pulling hole. The sediment in the sedimentation zone overflows and is discharged with the water in the hole, thereby realizing the sediment cleaning and replacement operation in the sedimentation zone. The sedimentation zone is filled with clean water. 3) A sealing device is inserted into the core-pulling hole and fixed in the core-pulling hole to seal the core-pulling hole; the sealing device has a grouting channel, and the grouting channel forms a grout outlet at the bottom of the sealing device, which is connected to the core-pulling hole; the grouting channel forms a grouting port at the top of the sealing device, which is connected to the grouting pump. The sealing device has a slurry outlet channel, which is connected to the core-pulling hole, and the slurry outlet channel is equipped with a slurry stop valve to close or open the slurry outlet channel; Open the grout stop valve, and the grout outlet is in the open state. Inject grouting liquid into the core extraction hole through the grouting pump to perform replacement grouting operation. The grouting liquid replaces the clear water in the sediment area so that the grouting liquid fills the sediment area. 4) Close the grout stop valve, and the grout outlet is in a closed state. Inject grouting liquid into the core extraction hole through the grouting pump to carry out closed high-pressure grouting operation until the pressure in the core extraction hole reaches the set pressure value. 5) Remove the sealing device from the core-pulling hole, which is now open. Add grouting fluid into the core-pulling hole to perform supplementary grouting until the grouting fluid overflows from the core-pulling hole.

[0009] Furthermore, in construction step 2), while injecting high-pressure gas into the core-pulling hole, clean water is simultaneously injected into the core-pulling hole to replace the sediment in the sedimentation zone. The sediment cleaning and replacement operation is stopped after the clean water overflows from the core-pulling hole.

[0010] Furthermore, in construction step 2), a high-pressure air pipe is inserted into the core-pulling hole. The upper end of the high-pressure air pipe extends out of the core-pulling hole and is connected to the air compressor. The lower end of the high-pressure air pipe extends into the sedimentation area. During the sludge cleaning and replacement operation, the air compressor injects high-pressure gas into the high-pressure air duct and simultaneously injects clean water into the core extraction hole. The high-pressure gas agitates the sludge in the sludge zone so that the sludge overflows and is discharged from the core extraction hole from bottom to top along with the water in the hole.

[0011] Furthermore, in construction step 2), the lower end of the high-pressure air duct is connected to a washing pipe, the washing pipe has a washing channel, and the end of the washing pipe forms an exhaust port; the side of the exhaust port has only one notch area. During the sludge cleaning and replacement operation, the washing pipe is inserted into the sludge in the sludge zone, and the air compressor injects high-pressure gas into the high-pressure air pipe. The high-pressure gas is discharged downward through the exhaust port and laterally through the notch area, so that the washing pipe continues to twist in the sludge zone, and the high-pressure gas continuously twists and agitates the sludge in the sludge zone.

[0012] Furthermore, in construction step 2), after the high-pressure air duct is lowered into the core extraction hole, a water injection pipe is lowered into the core extraction hole; before the high-pressure air duct injects high-pressure gas into the core extraction hole, the water injection pipe first injects clean water into the core extraction hole until the clean water fills the core extraction hole, and then the high-pressure air duct injects high-pressure gas into the core extraction hole.

[0013] Furthermore, in construction step 3), the outer periphery of the sealing device is provided with an expansion bladder that can expand or contract, and the expansion bladder is arranged around the periphery of the sealing device; after the sealing device is placed in the core-pulling hole, the expansion bladder expands and abuts against the inner wall of the core-pulling hole, so that the sealing device is fixed in the core-pulling hole, and the core-pulling hole is in a closed state. In construction step 5), the expansion bladder contracts, and after the expansion bladder detaches from the inner wall of the core-pulling hole, the sealing device is withdrawn from the core-pulling hole, and the core-pulling hole is in the open state.

[0014] Furthermore, in construction step 3), a water pipe is connected to the expansion bladder, and the water pipe is connected to a water pressure pump and a water pressure valve; when the sealing device is placed in the core-pulling hole, the water pressure valve is closed, and the water pressure pump injects pressurized water into the expansion bladder, increasing the internal pressure of the expansion bladder and causing the expansion bladder to expand outward until the outer periphery of the expansion bladder abuts against the inner wall of the core-pulling hole, and the sealing device is fixed in the core-pulling hole; In construction step 5), the water pressure valve is opened, and the pressurized water in the expansion bladder is released through the water pressure valve. The internal pressure of the expansion bladder decreases, and the expansion bladder contracts inward until the outer periphery of the expansion bladder separates from the inner wall of the core-pulling hole, and the sealing device is removed from the core-pulling hole.

[0015] Furthermore, in the construction step 3), the grout outlet is connected to a grouting pipe. After the sealing device is fixed in the core-pulling hole, the grouting pipe extends into the sediment area. The grouting liquid injected by the grouting pump is injected into the sediment area through the grouting channel and the grouting pipe, and then the sediment area replaces the clean water in the sediment area from bottom to top. In construction step 5), when performing the supplementary grouting operation, the grouting pipe extends into the core-pulling hole to supplement the grouting fluid into the core-pulling hole so that the grouting fluid fills the core-pulling hole.

[0016] Furthermore, in construction step 2), the bottom of the flushing pipe has a bottom section, which encloses and forms the exhaust port, and the notch area is formed on the bottom section; Along the blowing direction of the high-pressure gas, the bottom section is arranged to expand outward at an angle; the inner wall of the bottom section is provided with a plurality of rolling balls, and the surface of the balls is provided with a plurality of recessed grooves; the inner side of the balls is movably placed in the bottom section, and the outer side of the balls is exposed in the washing channel. During the process of high-pressure gas being blown out from the exhaust port and the gap area, the high-pressure gas drives multiple balls to roll freely, so that the washing pipe is continuously twisted in the sediment zone.

[0017] Furthermore, in construction step 3), the expansion bladder has an inner peripheral side that is fixedly wrapped around the outer periphery of the sealing device and is in the shape of an annular shape, and an outer peripheral side that is surrounded around the outer periphery of the inner peripheral side and is in the shape of an annular shape; when the internal pressure in the expansion bladder increases, the outer peripheral side expands and deforms outward away from the inner peripheral side; when the internal pressure in the expansion bladder decreases, the outer peripheral side contracts and deforms inward relative to the inner peripheral side. The outer peripheral side is provided with multiple arc-shaped curved strips, which are arranged at intervals around the circumference of the outer peripheral side to form a discontinuous positioning ring. The positioning ring is arranged at an angle to the axial direction of the sealing device. After the outer peripheral side of the expansion bladder expands and deforms outward, it abuts against the inner wall of the core-pulling hole. Simultaneously, the positioning ring expands and tilts outward to form an inclined positioning between the outer peripheral side and the inner wall of the core-pulling hole.

[0018] Compared with the prior art, the construction method for high-pressure cleaning and sealing grouting filling repair of sediment defects in cast-in-place piles provided by the present invention first drills core extraction holes in the cast-in-place piles to provide a direct passage for subsequent cleaning and grouting, ensuring precise operation.

[0019] Secondly, by injecting high-pressure gas into the core-pulling hole, the kinetic energy of the high-pressure gas is used to quickly discharge the water and sediment in the hole, thus completing the efficient replacement and cleaning of the sediment area.

[0020] Because the high-pressure gas can overcome the limitations of weak bonding between the sediment zone and the bedrock interface, the sediment zone can be thoroughly cleaned and filled with clean water, providing a good medium environment for subsequent grouting.

[0021] Next, the core-pulling hole is sealed with a sealing device to ensure that the grouting operation is carried out in a completely enclosed environment.

[0022] The grouting channel and outlet channel in the sealing device, together with the control of the grout stop valve, firstly carry out replacement grouting, replacing the clear water in the sediment area with grouting fluid to ensure that the grouting fluid fully fills the sediment area; secondly, through the closed high-pressure grouting operation, the grouting density is further improved, so that the grouting fluid can penetrate more fully into the pores of the sediment area and the bedrock fissures under pressure, thereby improving the bearing capacity of the cast-in-place pile.

[0023] Finally, after the sealing device is removed, supplementary grouting is performed to compensate for any local defects that may have occurred during the initial grouting, ensuring that the grout completely fills the core extraction hole and preventing permanent defects from remaining in the cast-in-place pile. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the construction method for high-pressure cleaning and sealing grouting filling repair of sediment defects in cast-in-place piles provided by the present invention. Figure 2 This is a simplified schematic diagram of the high-pressure gas replacement operation via the core-pulling hole provided by the present invention; Figure 3 This is a simplified schematic diagram of the replacement grouting operation provided by the present invention; Figure 4 This is a simplified schematic diagram of a closed high-pressure grouting operation provided by the present invention; Figure 5 This is a front view schematic diagram of the flushing tube provided by the present invention; Figure 6 This is a cross-sectional schematic diagram of the expansion bladder provided by the present invention; Figure 7 This is a schematic diagram of the tilt of the positioning ring provided by the present invention; Figure 8 This is a partial three-dimensional schematic diagram of the bottom segment provided by the present invention; Figure 9 This is a cross-sectional schematic diagram of the ball bearing provided by the present invention; In the diagram: 100 cast-in-place pile, 101 sedimentation zone, 102 core extraction hole; 200 sealing device, 201 grout outlet, 202 grout outlet, 203 grouting port, 204 grouting pump, 205 grout stop valve, 206 grouting pipe; Air compressor 300, high-pressure air duct 301, cleaning pipe 302, cleaning channel 303, exhaust port 304, notch area 305, bottom section 306, ball bearing 307, recessed groove 308. 400 expansion bladder, 401 water pipe, 402 water pressure pump, 403 water pressure valve, 404 inner circumferential side, 405 outer circumferential side, 406 bending strip, 407 positioning ring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0027] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] Reference Figure 1-9 The image shows a preferred embodiment of the present invention.

[0029] The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles includes the following construction steps: 1) The bottom of the cast-in-place pile 100 has a sedimentation zone 101, and sedimentation zone 101 contains sediment; a core-pulling hole 102 is drilled in the cast-in-place pile 100, the top of the core-pulling hole 102 penetrates the top of the cast-in-place pile 100, and the bottom of the core-pulling hole 102 extends to the sedimentation zone 101. 2) High-pressure gas is injected into the core-pulling hole 102. The water in the core-pulling hole 102 overflows and is discharged. The sediment in the sedimentation zone 101 overflows and is discharged with the water in the hole, thus realizing the sediment cleaning and replacement operation of the sedimentation zone 101. The sedimentation zone 101 is filled with clean water. 3) Insert the sealing device 200 into the core-pulling hole 102. The sealing device 200 is fixed in the core-pulling hole 102, sealing the core-pulling hole 102. The sealing device 200 has a grouting channel. The grouting channel forms a grout outlet 202 at the bottom of the sealing device 200, which is connected to the core-pulling hole 102. The grouting channel forms a grouting port 203 at the top of the sealing device 200, which is connected to the grouting pump 204. The sealing device 200 has a slurry outlet channel 201, which is connected to the core-pulling hole 102, and the slurry outlet channel 201 is provided with a slurry stop valve 205 to close or open the slurry outlet channel 201. Open the grout stop valve 205, and the grout outlet 201 is in the open state. Inject grouting liquid into the core extraction hole 102 through the grouting pump 204 to carry out replacement grouting operation. The grouting liquid replaces the clear water in the sediment zone 101 so that the grouting liquid fills the sediment zone 101. 4) Close the grout stop valve 205, and the grout outlet 201 is in the closed state. Inject grouting liquid into the core extraction hole 102 through the grouting pump 204 to carry out closed high-pressure grouting operation until the pressure in the core extraction hole 102 reaches the set pressure value. 5) Remove the sealing device 200 from the core-pulling hole 102. The core-pulling hole 102 is in the open state. Add grouting fluid to the core-pulling hole 102 to perform supplementary grouting operations until the grouting fluid overflows from the core-pulling hole 102.

[0030] The above-mentioned construction method for high-pressure cleaning and sealing grouting to repair sediment defects in cast-in-place pile 100 first involves drilling a core extraction hole 102 in the cast-in-place pile 100 to provide a direct passage for subsequent cleaning and grouting, ensuring precise operation.

[0031] Secondly, by injecting high-pressure gas into the core-pulling hole 102, the kinetic energy of the high-pressure gas is used to quickly discharge the water and sediment in the hole, thus completing the efficient replacement and cleaning of the sediment zone 101.

[0032] Because the high-pressure gas was able to overcome the limitations of the weak bond between the sediment zone 101 and the bedrock interface, the sediment zone 101 was thoroughly cleaned and filled with clean water, providing a good medium environment for subsequent grouting.

[0033] Next, the core-pulling hole 102 is sealed by the sealing device 200 to ensure that the grouting operation is carried out in a completely closed environment.

[0034] Among them, the grouting channel and grout outlet channel 201 in the sealing device 200, together with the control of the grout stop valve 205, firstly carry out replacement grouting, replacing the clean water in the sediment zone 101 with grouting fluid to ensure that the grouting fluid fully fills the sediment zone 101; secondly, through the closed high-pressure grouting operation, the grouting density is further improved, so that the grouting fluid can penetrate more fully into the pores and bedrock fissures of the sediment zone 101 under pressure, thereby improving the bearing capacity of the cast-in-place pile 100.

[0035] Finally, after the sealing device 200 is removed, supplementary grouting is performed to compensate for any local defects that may have occurred during the initial grouting, ensuring that the grout completely fills the core extraction hole 102 and preventing permanent defects from remaining in the cast-in-place pile 100.

[0036] The grouting fluid mentioned in this embodiment can be prepared by using P.O42.5 ordinary Portland cement and special additives, with a water-cement ratio of 0.45, and by using an integrated mixing and grouting machine.

[0037] The grouting and mixing machine completes the process in two mixing tanks: 200Kg of cement and 90Kg of water are added to the first mixing tank and mixed for 1 minute. Then, 600ml of special additive is poured into the tank. After the first mixing tank is mixed for 2 minutes, the valve of the first mixing tank is opened to discharge the grouting liquid into the second mixing tank. The second mixing tank is mixed again for 1 minute, and the grouting liquid is then prepared.

[0038] As an extended embodiment, in construction step 2), while injecting high-pressure gas into the core-pulling hole 102, clean water is simultaneously injected into the core-pulling hole 102 to replace the sediment in the sedimentation zone 101. The sediment cleaning and replacement operation is stopped after the clean water overflows from the core-pulling hole 102.

[0039] In this way, the high-pressure gas injected into the core extraction hole 102 generates strong kinetic energy, which drives the water and sediment in the core extraction hole 102 to rise and be discharged. At the same time, the injected clean water can reduce the frictional resistance of sediment discharge, making it easier for sediment to overflow with the water flow.

[0040] When the clean water overflows from the core extraction hole 102, it indicates that the sediment has been basically replaced. At this point, the operation should be stopped to reduce the waste of resources caused by over-cleaning, thereby improving cleaning efficiency and quality, reducing sediment residue, and creating favorable conditions for subsequent grouting operations.

[0041] As an extended embodiment, in construction step 2), a high-pressure air pipe 301 is inserted into the core-pulling hole 102. The upper end of the high-pressure air pipe 301 extends out of the core-pulling hole 102 and is connected to the air compressor 300. The lower end of the high-pressure air pipe 301 extends into the sedimentation zone 101. During the sludge cleaning and replacement operation, the air compressor 300 injects high-pressure gas into the high-pressure air pipe 301 and simultaneously injects clean water into the core extraction hole 102. The high-pressure gas agitates the sludge in the sludge zone 101 so that the sludge overflows and is discharged from the core extraction hole 102 from bottom to top along with the water in the hole.

[0042] High-pressure gas is directly delivered to the sedimentation zone 101 through a high-pressure air duct 301. The gas has greater kinetic energy and can better agitate the sediment, making it loose and suspended. The simultaneously injected clear water can carry the sediment, and with the help of the gas lifting effect, the sediment overflows from the bottom to the outside of the hole with the water flow.

[0043] This enhances the ability to disturb and carry sediment, making it particularly suitable for situations where the sediment is thick and dense. It can remove sediment more thoroughly and reduce sediment accumulation at the bottom of the hole, which not only improves the sediment cleaning and replacement effect but also improves the quality of sediment defect repair in cast-in-place piles.

[0044] As an extended embodiment, in construction step 2), the lower end of the high-pressure air duct 301 is connected to a washing pipe 302, the washing pipe 302 has a washing channel 303, and the end of the washing pipe 302 forms an exhaust port 304; the side of the exhaust port 304 only has a notch area 305. During the sludge cleaning and replacement operation, the washing pipe 302 is inserted into the sludge in the sludge zone 101. The air compressor 300 injects high-pressure gas into the high-pressure air pipe 301. The high-pressure gas is discharged downward through the exhaust port 304 and laterally through the notch area 305, so that the washing pipe 302 continuously twists in the sludge zone 101, and the high-pressure gas continuously twists and agitates the sludge in the sludge zone 101.

[0045] The downward-discharged gas can directly impact the bottom of the sludge, while the side-discharged gas causes the washing pipe 302 to twist, stirring the sludge around the sludge zone 101. This multi-directional gas disturbance method can loosen the sludge in all directions and improve cleaning efficiency.

[0046] In actual construction, the 302 washing tube can flexibly adapt to the environment when faced with different forms of sediment distribution, ensuring that the sediment is cleaned without dead angles, thereby improving the precision of sediment cleaning.

[0047] As an extended embodiment, in construction step 2), after the high-pressure air duct 301 is lowered into the core extraction hole 102, the water injection pipe 401 is lowered into the core extraction hole 102; before the high-pressure air duct 301 injects high-pressure gas into the core extraction hole 102, the water injection pipe 401 first injects clean water into the core extraction hole 102 until the core extraction hole 102 is full of clean water, and then the high-pressure air duct 301 injects high-pressure gas into the core extraction hole 102.

[0048] First, clean water is injected into the core extraction hole 102 through the water injection pipe 401 to create an aquatic environment inside the hole. Then, high-pressure gas is injected through the high-pressure air pipe 301. The gas forms bubbles in the water and rises, causing strong convection in the water, which enhances the flushing and carrying effect on the sediment.

[0049] Furthermore, the clean water also acts as a buffer and lubricant, reducing the direct impact of gas on the core extraction hole 102; this optimized cleaning process allows for a more thorough synergistic effect between gas and water, improving the quality of sediment cleaning.

[0050] As an extended embodiment, in construction step 3), the outer periphery of the sealing device 200 is provided with an expansion bladder 400 that can expand or contract, and the expansion bladder 400 is arranged around the circumference of the sealing device 200; after the sealing device 200 is placed in the core-pulling hole 102, the expansion bladder 400 expands and abuts against the inner wall of the core-pulling hole 102, so that the sealing device 200 is fixed in the core-pulling hole 102, and the core-pulling hole 102 is in a closed state; In construction step 5), the expansion bladder 400 contracts and, after the expansion bladder 400 detaches from the inner wall of the core-pulling hole 102, the sealing device 200 is withdrawn from the core-pulling hole 102, and the core-pulling hole 102 is in the open state.

[0051] By setting up the expansion bladder 400, the stability and sealing of the sealing device 200 are improved. After the expansion bladder 400 expands, it fits tightly against the inner wall of the core-pulling hole 102, forming a sealing barrier to prevent the grout from flowing up along the gap, thereby improving the grouting filling effect.

[0052] After the expansion bladder 400 contracts, the sealing device 200 can be removed, and the core extraction hole 102 can be reopened, which facilitates subsequent supplementary grouting operations. In construction that requires multiple grouting operations, this ensures that each grouting is carried out in a closed environment, increases the grouting pressure and the grout diffusion range, and enhances the bearing capacity of the pile foundation.

[0053] As an extended embodiment, in construction step 3), a water pipe 401 is connected to the expansion bladder 400, and the water pipe 401 is connected to a water pressure pump 402 and a water pressure valve 403; when the sealing device 200 is placed in the core-pulling hole 102, the water pressure valve 403 is closed, and the water pressure pump 402 injects pressurized water into the expansion bladder 400, the internal pressure of the expansion bladder 400 increases, and the expansion bladder 400 expands outward until the outer periphery of the expansion bladder 400 abuts against the inner wall of the core-pulling hole 102, and the sealing device 200 is fixed in the core-pulling hole 102; In construction step 5), the water pressure valve 403 is opened, and the pressurized water in the expansion bladder 400 is released through the water pressure valve 403. The internal pressure of the expansion bladder 400 is reduced, and the expansion bladder 400 contracts inward until the outer periphery of the expansion bladder 400 is separated from the inner wall of the core-pulling hole 102, and the sealing device 200 is removed from the core-pulling hole 102.

[0054] By injecting pressurized water into the expansion bladder 400 through the water pressure pump 402, the degree of expansion of the expansion bladder 400 can be controlled, so that it fits tightly against the inner wall of the core extraction hole 102; when it is necessary to unseal during construction, the water pressure valve 403 is opened, the pressurized water is released, and the expansion bladder 400 quickly contracts.

[0055] This water pressure control method is responsive and easy to operate. It can flexibly adjust the expansion force according to the diameter of different core-pulling holes 102 and the inner wall conditions, providing a stable and controllable closed environment for grouting operations. It also provides good preconditions for subsequent supplementary grouting operations, thereby improving grouting quality and reducing grout loss.

[0056] As an extended embodiment, in construction step 3), the grout outlet 202 is connected to the grouting pipe 206. After the sealing device 200 is fixed in the core extraction hole 102, the grouting pipe 206 extends into the sedimentation zone 101. The grouting liquid injected by the grouting pump 204 is injected into the sedimentation zone 101 through the grouting channel and the grouting pipe 206, and then the sedimentation zone 101 replaces the clean water in the sedimentation zone 101 from bottom to top. In construction step 5), when performing supplementary grouting, the grouting pipe 206 extends into the core-pulling hole 102 to supplement the grouting fluid into the core-pulling hole 102 so that the grouting fluid fills the core-pulling hole 102.

[0057] In this way, by using the grouting pipe 206 to penetrate into the core extraction hole 102, supplementary grouting operations are carried out to further fill the gaps caused by the shrinkage of the grouting liquid or the incomplete compaction of the initial grouting, thereby improving the overall compactness of the sediment zone 101.

[0058] In construction step 3), the grouting pump 204 directly delivers the grouting fluid to the sedimentation zone 101 through the grouting channel and grouting pipe 206, which improves the grouting efficiency and filling effect.

[0059] When dealing with deep sediment defects, the extension of the grouting pipe 206 ensures that the grouting fluid reaches the defect location directly, enhancing the repair effect and improving the repair quality of sediment defects in the cast-in-place pile 100.

[0060] As an extended embodiment, in construction step 2), the bottom of the flushing pipe 302 has a bottom section 306, the bottom section 306 encloses to form an exhaust port 304, and a notch area 305 is formed on the bottom section 306. Along the blowing direction of the high-pressure gas, the bottom section 306 is inclined and expanded outward; the inner wall of the bottom section 306 is provided with a plurality of rolling balls 307, and the surface of the balls 307 is provided with a plurality of recessed grooves 308; the inner side of the balls 307 is movably placed in the bottom section 306, and the outer side of the balls 307 is exposed in the washing channel 303. During the process of high-pressure gas being blown out from the exhaust port 304 and the notch area 305, the high-pressure gas drives multiple balls 307 to roll freely, so that the washing tube 302 is continuously twisted in the sediment area 101; such twisting, combined with the impact of high-pressure gas, can more efficiently agitate the sediment, making the sediment loose and suspended.

[0061] The bottom section 306, which expands outward along the direction of gas blowing, increases the contact area between the gas and the sediment, enhancing the gas carrying capacity. In addition, the grooves 308 on the surface of the ball bearings 307 can increase the turbulence of the water flow, further improving the cleaning effect of the sediment.

[0062] In complex strata, when faced with sediment of different properties, the washing pipe 302 can flexibly adjust the disturbance mode to ensure the adaptability and effectiveness of the cleaning operation, which helps to improve the quality of sediment cleaning.

[0063] As an extended embodiment, in construction step 3), the expansion bladder 400 has an inner peripheral side 404 that is fixedly wrapped around the outer periphery of the sealing device 200 and is annular, and an outer peripheral side 405 that is surrounded around the outer periphery of the inner peripheral side 404 and is annular; when the internal pressure in the expansion bladder 400 increases, the outer peripheral side 405 expands and deforms outward away from the inner peripheral side 404; when the internal pressure in the expansion bladder 400 decreases, the outer peripheral side 405 contracts and deforms inward relative to the inner peripheral side 404. The outer peripheral side 405 is provided with a plurality of arc-shaped curved strips 406. The plurality of curved strips 406 are arranged around the outer peripheral side 405 at intervals to form a discontinuous positioning ring 407. The positioning ring 407 is inclined to the axial direction of the sealing device 200. After the outer peripheral side 405 of the expansion bladder 400 expands and deforms outward, it abuts against the inner wall of the core-pulling hole 102. Simultaneously, the positioning ring 407 tilts and expands outward to form an inclined positioning between the outer peripheral side 405 and the inner wall of the core-pulling hole 102.

[0064] This tilted positioning creates a height difference in the positioning ring 407, which allows the positioning ring 407 to better match the uneven shape of the inner wall, playing a role in positioning and support, and enhancing the fixing effect of the sealing device 200.

[0065] During the grouting process, even if there are pressure changes inside the core-pulling hole 102, the sealing device 200 can remain stable and avoid displacement due to external forces. Because the discontinuous positioning ring 407 composed of multiple arc-shaped curved strips 406 is arranged obliquely along the axial direction of the sealing device 200, the friction and sealing performance between the expansion bladder 400 and the inner wall are further improved.

[0066] This is particularly suitable for the repair construction of cast-in-place piles 100 under complex geological conditions. It can solve the problems of unreliable sealing and easy displacement of the sealing device 200, thereby ensuring the uniformity and compactness of the grouting effect and improving the repair quality of sediment defects.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for high-pressure cleaning and sealing grouting filling repair of sediment defects in cast-in-place piles, characterized in that, The construction steps include the following: 1) The bottom of the cast-in-place pile has a sediment zone containing sediment; a core-pulling hole is drilled in the cast-in-place pile, the top of the core-pulling hole penetrates the top of the cast-in-place pile, and the bottom of the core-pulling hole extends to the sediment zone. 2) High-pressure gas is injected into the core-pulling hole, and the water in the core-pulling hole overflows and is discharged from the core-pulling hole. The sediment in the sedimentation zone overflows and is discharged with the water in the hole, thereby realizing the sediment cleaning and replacement operation in the sedimentation zone. The sedimentation zone is filled with clean water. 3) A sealing device is inserted into the core-pulling hole and fixed in the core-pulling hole to seal the core-pulling hole; the sealing device has a grouting channel, and the grouting channel forms a grout outlet at the bottom of the sealing device, which is connected to the core-pulling hole; the grouting channel forms a grouting port at the top of the sealing device, which is connected to the grouting pump. The sealing device has a slurry outlet channel, which is connected to the core-pulling hole, and the slurry outlet channel is equipped with a slurry stop valve to close or open the slurry outlet channel; Open the grout stop valve, and the grout outlet is in the open state. Inject grouting liquid into the core extraction hole through the grouting pump to perform replacement grouting operation. The grouting liquid replaces the clear water in the sediment area so that the grouting liquid fills the sediment area. 4) Close the grout stop valve, and the grout outlet is in a closed state. Inject grouting liquid into the core extraction hole through the grouting pump to carry out closed high-pressure grouting operation until the pressure in the core extraction hole reaches the set pressure value. 5) Remove the sealing device from the core-pulling hole, which is now open. Add grouting fluid into the core-pulling hole to perform supplementary grouting until the grouting fluid overflows from the core-pulling hole.

2. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 1, characterized in that, In construction step 2), while injecting high-pressure gas into the core-pulling hole, clean water is simultaneously injected into the core-pulling hole to replace the sediment in the sedimentation zone. The sediment cleaning and replacement operation is stopped after the clean water overflows from the core-pulling hole.

3. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 1 or 2, characterized in that, In construction step 2), a high-pressure air pipe is inserted into the core-pulling hole. The upper end of the high-pressure air pipe extends out of the core-pulling hole and is connected to the air compressor. The lower end of the high-pressure air pipe extends into the sedimentation area. During the sludge cleaning and replacement operation, the air compressor injects high-pressure gas into the high-pressure air duct and simultaneously injects clean water into the core extraction hole. The high-pressure gas agitates the sludge in the sludge zone so that the sludge overflows and is discharged from the core extraction hole from bottom to top along with the water in the hole.

4. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 3, characterized in that, In construction step 2), the lower end of the high-pressure air duct is connected to a washing pipe, the washing pipe has a washing channel, and the end of the washing pipe forms an exhaust port; the side of the exhaust port has only one notch area. During the sludge cleaning and replacement operation, the washing pipe is inserted into the sludge in the sludge zone, and the air compressor injects high-pressure gas into the high-pressure air pipe. The high-pressure gas is discharged downward through the exhaust port and laterally through the notch area, so that the washing pipe continues to twist in the sludge zone, and the high-pressure gas continuously twists and agitates the sludge in the sludge zone.

5. The high-pressure cleaning and sealing grouting method for repairing sediment defects in cast-in-place piles as described in claim 3, characterized in that... In construction step 2), after the high-pressure air duct is lowered into the core extraction hole, a water injection pipe is lowered into the core extraction hole; before the high-pressure air duct injects high-pressure gas into the core extraction hole, the water injection pipe first injects clean water into the core extraction hole until the clean water fills the core extraction hole, and then the high-pressure air duct injects high-pressure gas into the core extraction hole.

6. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 1 or 2, characterized in that, In construction step 3), the outer periphery of the sealing device is provided with an expansion bladder that can expand or contract, and the expansion bladder is arranged around the periphery of the sealing device; after the sealing device is placed in the core-pulling hole, the expansion bladder expands and abuts against the inner wall of the core-pulling hole, so that the sealing device is fixed in the core-pulling hole, and the core-pulling hole is in a closed state. In construction step 5), the expansion bladder contracts, and after the expansion bladder detaches from the inner wall of the core-pulling hole, the sealing device is withdrawn from the core-pulling hole, and the core-pulling hole is in the open state.

7. The high-pressure cleaning and sealing grouting method for repairing sediment defects in cast-in-place piles as described in claim 6, characterized in that, In construction step 3), a water pipe is connected to the expansion bladder, and the water pipe is connected to a water pressure pump and a water pressure valve. When the sealing device is placed in the core-pulling hole, the water pressure valve is closed, and the water pressure pump injects pressurized water into the expansion bladder. The internal pressure of the expansion bladder increases, and the expansion bladder expands outward until the outer periphery of the expansion bladder abuts against the inner wall of the core-pulling hole, and the sealing device is fixed in the core-pulling hole. In construction step 5), the water pressure valve is opened, and the pressurized water in the expansion bladder is released through the water pressure valve. The internal pressure of the expansion bladder decreases, and the expansion bladder contracts inward until the outer periphery of the expansion bladder separates from the inner wall of the core-pulling hole, and the sealing device is removed from the core-pulling hole.

8. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 1 or 2, characterized in that, In construction step 3), the grout outlet is connected to a grouting pipe. After the sealing device is fixed in the core-pulling hole, the grouting pipe extends into the sediment area. The grouting liquid injected by the grouting pump is injected into the sediment area through the grouting channel and the grouting pipe, and then the sediment area replaces the clean water in the sediment area from bottom to top. In construction step 5), when performing the supplementary grouting operation, the grouting pipe extends into the core-pulling hole to supplement the grouting fluid into the core-pulling hole so that the grouting fluid fills the core-pulling hole.

9. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 4, characterized in that, In construction step 2), the bottom of the flushing pipe has a bottom section, which encloses the exhaust port, and the notch area is formed on the bottom section; Along the blowing direction of the high-pressure gas, the bottom section is arranged to expand outward at an angle; the inner wall of the bottom section is provided with a plurality of rolling balls, and the surface of the balls is provided with a plurality of recessed grooves; the inner side of the balls is movably placed in the bottom section, and the outer side of the balls is exposed in the washing channel. During the process of high-pressure gas being blown out from the exhaust port and the gap area, the high-pressure gas drives multiple balls to roll freely, so that the washing pipe is continuously twisted in the sediment zone.

10. The construction method for high-pressure cleaning and sealing grouting repair of sediment defects in cast-in-place piles as described in claim 6, characterized in that, In construction step 3), the expansion bladder has an inner peripheral side that is fixedly wrapped around the outer periphery of the sealing device and is in the shape of an annular shape, and an outer peripheral side that is surrounded around the outer periphery of the inner peripheral side and is in the shape of an annular shape; when the internal pressure in the expansion bladder increases, the outer peripheral side expands and deforms outward away from the inner peripheral side; when the internal pressure in the expansion bladder decreases, the outer peripheral side contracts and deforms inward relative to the inner peripheral side. The outer peripheral side is provided with multiple arc-shaped curved strips, which are arranged at intervals around the circumference of the outer peripheral side to form a discontinuous positioning ring. The positioning ring is arranged at an angle to the axial direction of the sealing device. After the outer peripheral side of the expansion bladder expands and deforms outward, it abuts against the inner wall of the core-pulling hole. Simultaneously, the positioning ring expands and tilts outward to form an inclined positioning between the outer peripheral side and the inner wall of the core-pulling hole.

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