Post-grouting and grouting construction device and method for rammed and expanded cast-in-place pile

Abstract

The invention relates to a post-grouting and grouting construction device and method for a rammed and expanded cast-in-place pile, and belongs to the technical field of grouting construction tools. The construction device comprises a moving seat, slurry storing and stirring equipment, a hoisting mechanism and a pumping grouting machine are arranged at the upper end of the moving seat, the slurry storing and stirring equipment is connected with the pumping grouting machine, a liftable supporting frame is fixedly arranged on the front side of the upper end of the moving seat, a fixed pulley is arranged at the upper end of the supporting frame, and the hoisting mechanism comprises a winding drum. A steel wire is wound on the outer side of the winding drum, the end, away from the winding drum, of the steel wire bypasses the fixed pulley and then is fixedly provided with a grouting mechanism, the grouting mechanism comprises a balance weight lever, the balance weight lever is connected with the steel wire, the lower end of the balance weight lever is connected with a grouting anchor rod through a connector, and a supporting sealing assembly is arranged on the outer side of the grouting anchor rod; the supporting and sealing assembly is clamped to a cast-in-place pile hole opening. The problems that an existing grouting construction device is inaccurate in grouting depth control and unstable in grouting fitting sealing effect are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of grouting construction tools, and particularly relates to a post-grouting construction device and method for ramming-expanded cast-in-place piles. Background Art

[0002] The ramming-expanded cast-in-place pile is a form of pile foundation commonly used for reinforcing foundations, and its construction quality directly affects the stability and safety of buildings. At present, post-grouting construction after ramming-expanded cast-in-place piles has been widely used in engineering practice, but there are still many technical defects in existing grouting construction devices, which restrict the improvement of grouting quality and construction efficiency.

[0003] Most existing grouting construction devices adopt a split structure, with the mud mixing device and the grouting mechanism being independent of each other, resulting in the need for multiple devices to cooperate during construction, increasing the transfer and debugging time between devices. At the same time, due to the large overall weight and volume of the equipment, it is very difficult to transfer and deploy between multiple construction sites, seriously affecting the construction progress. Especially in large-scale projects or continuous operation at multiple construction sites, the poor mobility of the equipment has become an important factor restricting construction efficiency. Traditional sealing methods mostly use rubber gaskets or mechanical pressing devices, which are prone to leakage during high-pressure grouting, resulting in slurry backflow and leakage. This not only wastes grouting materials but may also cause loosening of the soil around the pile foundation. At the same time, existing sealing devices lack real-time monitoring and adjustment functions and cannot be adjusted accordingly according to the pressure changes during grouting, making it difficult to ensure the sealing effect and ultimately affecting the grouting quality. For this reason, this application designs a post-grouting construction device and method for ramming-expanded cast-in-place piles to solve the above problems. Summary of the Invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a post-grouting construction device and method for ramming-expanded cast-in-place piles, solving the problems of inaccurate control of grouting depth and unstable grouting fitting and sealing effect in existing grouting construction devices.

[0005] To achieve the above object, the present invention is realized by the following technical solutions.

[0006] A post-grouting construction device for ramming-expanded cast-in-place piles includes a moving seat. A mud storage and mixing device, a hoisting mechanism, and a pumping grouting machine are arranged at the upper end of the moving seat. The mud storage and mixing device is connected to the pumping grouting machine. A liftable support frame is fixedly arranged at the front side of the upper end of the moving seat. A fixed pulley is arranged at the upper end of the support frame. The hoisting mechanism includes a drum, and a steel wire is wound around the outside of the drum. One end of the steel wire away from the drum passes around the fixed pulley and is fixedly provided with a grouting mechanism. The grouting mechanism includes a counterweight rod, the counterweight rod is connected to the steel wire, the lower end of the counterweight rod is connected to a grouting anchor rod through a connector, and a support and sealing assembly is arranged outside the grouting anchor rod. The support and sealing assembly is clamped at the orifice of the cast-in-place pile.

[0007] Furthermore, the support frame includes two vertical multi-stage telescopic support rods, four cooperating adjustment rods, and a horizontal support block. The lower ends of the two multi-stage telescopic support rods are respectively fixedly connected to both sides of the front end of the upper surface of the moving seat, and the upper ends of the two multi-stage telescopic support rods are respectively fixedly connected to the left and right ends of the lower surface of the support block. Two telescopable cooperating adjustment rods are respectively rotatably provided at the upper ends of each multi-stage telescopic support rod. The lower end of one of the cooperating adjustment rods is hinged to the upper end of the moving seat, and the lower end of the other cooperating adjustment rod is connected to the ground.

[0008] Furthermore, the multi-stage telescopic support rod is formed by multiple nested support rods sleeved with each other. A plurality of limiting holes are provided on each nested support rod, and the same limiting pin is inserted into the limiting holes on two adjacent nested support rods to fix the two adjacent nested support rods; the upper end of the uppermost nested support rod is fixedly connected to the lower surface of the support block through a connecting seat.

[0009] Furthermore, the cooperating adjustment rod includes a telescopic rod, a threaded sleeve, and a threaded rod; the telescopic rod includes an inner rod and an outer cylinder. The inner rod is slidably inserted into the upper opening of the outer cylinder. A threaded sleeve is rotatably provided at the lower end of the outer cylinder of the telescopic rod, and a threaded rod is screwed into the lower opening of the threaded sleeve; the two cooperating adjustment rods are respectively located at the rear side of the multi-stage telescopic support rod and on the side away from the other multi-stage telescopic support rod; the upper ends of the inner rods of the telescopic rods of the two cooperating adjustment rods are respectively hinged to the connecting seat at the upper end of the multi-stage telescopic support rod. The lower end of the threaded rod of the cooperating adjustment rod located at the rear side is rotatably connected to the hinge seat fixedly provided at the upper end of the moving seat; the lower end of the threaded rod of the cooperating adjustment rod located on the side away from the other multi-stage telescopic support rod is rotatably provided with a grounding seat, and the grounding seat is fixedly provided on the ground through a ground nail.

[0010] Furthermore, a sliding groove extending in the front-rear direction is provided in the middle of the lower surface of the support block. A clamping groove is respectively provided at the upper ends of the left and right inner walls of the sliding groove. A row of limiting grooves is provided at the inner bottom surface of each clamping groove. The same sliding plate is slidably provided in the two clamping grooves. A fixed pulley seat is fixedly provided in the middle of the lower surface of the sliding plate, and the fixed pulley is rotatably provided in the fixed pulley seat; limiting strips are respectively fixedly provided at the left and right sides of the lower surface of the sliding plate, and the two limiting strips are respectively clamped in one of the limiting grooves in the two clamping grooves; a plurality of vertical abutting springs are fixedly provided at the upper end of the sliding plate, and the upper ends of the abutting springs are connected to the upper surface of the clamping groove.

[0011] Furthermore, the counterweight rod remains vertical, and the upper end of the counterweight rod is fixedly connected to the end of the steel wire away from the reel; the grouting anchor rod remains vertical, and the upper end of the grouting anchor rod is fixedly connected to the lower end of the counterweight rod through a connector, and the connector is communicated with the inside of the grouting anchor rod; a grouting port is arranged on the side wall of the connector, and the grouting port is connected to a pumping grouting machine through a grouting pipe; a plurality of grouting holes are equidistantly arranged on the side wall of the lower half section of the grouting anchor rod.

[0012] Furthermore, the support sealing assembly includes a butt joint support plate, an air pump connecting pipe, a fixed threaded sleeve, a matching threaded sleeve, and an inflatable airbag; the butt joint support plate is a horizontally arranged circular plate-like structure, an installation hole is arranged at the center of the butt joint support plate, a fixed threaded sleeve is fixedly arranged on the upper side of the installation hole, the fixed threaded sleeve is externally screwed with a matching threaded sleeve, a circular through hole is arranged at the center of the top plate of the matching threaded sleeve, and a circle of abutting pads is arranged inside the through hole; a pneumatic pressure detection column is arranged on the top plate of the matching threaded sleeve; two threaded columns are arranged on the lower end surface of the butt joint support plate, and the outer sides of the two threaded columns are slidably sleeved with the same horizontally arranged circular limiting plate, locking nuts are respectively screwed at the lower ends of the two threaded columns, and an inflatable airbag is arranged between the limiting plate and the butt joint support plate, and the inflatable airbag is sleeved on the outer sides of the two threaded columns.

[0013] Furthermore, the grouting anchor rod sequentially passes through the matching threaded sleeve, the fixed threaded sleeve, the butt joint support plate, the inflatable airbag, and the limiting plate downward and then extends into the inside of the cast-in-place pile hole opening; the abutting pads inside the through hole of the matching threaded sleeve keep close contact with the outer side surface of the grouting anchor rod; a first regulating valve is fixedly arranged at the upper end of the butt joint support plate, the first regulating valve is a two-position three-way valve, the inlet of the first regulating valve is connected to the outlet of the air pump through the air pump connecting pipe, an air inlet pipe is fixedly arranged at the first outlet of the first regulating valve, the air inlet pipe directly passes through the butt joint support plate and extends into the inside of the cast-in-place pile hole opening, and the second outlet of the first regulating valve is directly connected to the inflatable airbag through an air supply pipe, and a second regulating valve is arranged on the air supply pipe.

[0014] Further, a main water delivery pipe is provided at the lower end of the outer side surface of the fixed threaded sleeve, and a vertical water distribution pipe is arranged in a circle inside the side wall of the fixed threaded sleeve. The upper end of the water distribution pipe extends into the fixed threaded sleeve, and a nozzle is fixedly arranged at the upper end of the water distribution pipe; the lower ends of all the water distribution pipes are connected to the main water delivery pipe through an annular connecting pipe. Two symmetric semi-circular chutes are arranged at the lower end of the inner wall of the fixed threaded sleeve, and a semi-circular pushing card plate is slidably arranged in each chute respectively; two symmetric adjusting bolts are screwed on the lower end of the outer wall of the fixed threaded sleeve, and the inner end of each adjusting bolt is rotatably connected to the outer side surface of the pushing card plate on the same side; a semi-circular extrusion air cushion is fixedly arranged on the inner side surface of each pushing card plate respectively; an arc-shaped return groove is arranged on the upper end surface of each pushing card plate, and the inner bottom surface of the return groove is inclined; a return pipe is arranged at the lower end of the outer side surface of the fixed threaded sleeve, and the inner end of the return pipe is connected to the lowest part inside the two return grooves.

[0015] A construction method of a post - grouting construction device for ramming - expanding cast - in - place piles includes the following steps: Step 1: First, connect the power supply to all electrical components, and then move the entire construction device near the construction site of the ramming - expanding cast - in - place pile; add raw materials into the mud storage and mixing equipment, and stir and mix these raw materials evenly to form slurry; then adjust the height of the support frame, and connect the four matching adjusting rods with the two multi - telescopic support rods; after the support frame is installed, adjust the front - rear position of the fixed pulley seat; connect the end of the steel wire far from the reel to the upper end of the counterweight rod after passing around the fixed pulley. At this time, the counterweight rod is at the highest position; connect the connector to the pumping grouting machine through the grouting pipe. Step 2: Place the abutting support plate on the upper end of the pile top. Sleeve a limiting plate outside the threaded column and tighten the locking nut at the lower end of the threaded column. The limiting plate and the abutting support plate jointly provide a pre-pressure for the inflatable airbag. Then place the abutting support plate at the orifice of the cast-in-place pile hole. Then threadedly connect an adjusting threaded sleeve outside the fixed threaded sleeve. Connect the first regulating valve to the air pump through an air pump connecting pipe, connect the inlet of the first regulating valve to the outlet at the air supply pipe, open the second regulating valve, and the air pump injects compressed air into the inflatable airbag, causing the inflatable airbag to expand and fit against the inner wall of the cast-in-place pile hole to ensure the tightness at the orifice of the cast-in-place pile hole. After the inflatable airbag is inflated, close the second regulating valve. Control the release of the steel wire to drive the counterweight rod and the grouting anchor rod to descend as a whole, so that the lower end of the grouting anchor rod sequentially passes through the mating threaded sleeve, the fixed threaded sleeve, the abutting support plate, the inflatable airbag, and the limiting plate and then extends into the cast-in-place pile hole. Stop descending after the grouting anchor rod reaches the specified depth. Ensure the tight contact between the abutting pad inside the through hole of the adjusting threaded sleeve and the outer wall of the grouting anchor rod to ensure the tightness at the through hole. Then connect the inlet of the first regulating valve to the outlet at the inlet pipe, and the air pump continuously injects compressed air into the cast-in-place pile hole through the inlet pipe to increase the pressure inside the cast-in-place pile hole, so that the inside of the cast-in-place pile hole remains in a high-pressure state, and use the air pressure detection column to monitor whether the tightness at the inflatable airbag and the abutting pad meets the requirements. Step 3: Inject the slurry into the grouting anchor rod, and the slurry sprays out from the grouting holes of the grouting anchor rod into the cast-in-place pile hole. During the grouting process, the operator needs to observe the reading of the air pressure detection column to ensure that the sealing state of the support sealing assembly is good. Step 4: After injecting a sufficient amount of slurry according to the design requirements, stop grouting. Wait for the injected slurry to initially solidify, and then slowly start the winch mechanism to wind up the steel wire to lift the grouting anchor rod out of the support sealing assembly. Step 5: Before the grouting anchor rod is lifted out, tighten the two adjusting bolts so that the two pushing clamping plates approach each other, and the extrusion air cushions on the two pushing clamping plates clamp the grouting anchor rod, thereby closing the mounting holes on the abutting support plate. Then inject water into the water delivery main pipe. The water delivery main pipe outputs the water through the connecting pipes into each water delivery branch pipe and sprays it out from the nozzles at the upper ends of the water delivery branch pipes into the fixed threaded sleeve to wash the outside of the grouting anchor rod. Wash while the grouting anchor rod is lifted upward, and the sewage after washing enters the return trough, and the sewage in the return trough is discharged outward through the return pipe.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: Through the cooperation of the moving seat and the moving wheels, and by means of the integrated design of the mud storage and mixing equipment and the pumping grouting machine, not only the mobility and stability of the device are ensured, but also efficient mud preparation and transportation can be achieved, facilitating the rapid transfer and deployment of the device between different construction sites, improving the mobility and operation efficiency of the construction device, and thus enabling the function of adapting to continuous operation at multiple construction sites; through the cooperation of the multiple telescopic support rods, the cooperating adjusting rod, the limit pins and the grounding seat in the support frame, the height of the device can be accurately adjusted, facilitating flexible adjustment according to different ground conditions and pile heights, improving the device's ability to adapt to uneven ground, and thus enabling the function of adapting to complex terrain construction conditions; through the cooperation of the limit strip, the limit groove and the abutting spring at the fixed pulley seat, the tension and movement trajectory of the winding wire can be effectively controlled, ensuring the stability of the grouting mechanism during the lifting and lowering process, improving the accuracy of the grouting depth control, and thus enabling the function of precise positioning grouting; furthermore, through the cooperation of the inflatable airbag, the first control valve, the second control valve and the air pressure detection column and other structures in the support sealing assembly, not only a reliable sealing environment can be effectively formed to prevent the backflow of the slurry, but also the air pressure adjustment and status monitoring can be conveniently carried out, improving the sealing effect and safety during the grouting process, and thus enabling the function of high-quality sealed grouting, finally solving the problems of inaccurate grouting depth control and unstable grouting fitting and sealing effect of the existing grouting construction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings: Figure 1 is the structural schematic diagram of the whole of the present invention Figure 1 ; Figure 2 is the structural schematic diagram of the whole of the present invention Figure 2 ; Figure 3 is the structural schematic diagram of the present invention after removing the grouting mechanism; Figure 4 is the internal structural schematic diagram of the support block; Figure 5 is the structural schematic diagram of the cooperating adjusting rod; Figure 6 is the structural schematic diagram of the grouting mechanism; Figure 7 is the connection schematic diagram of the grouting anchor rod and the support sealing assembly; Figure 8 is the structural schematic diagram of the support sealing assembly; Figure 9 is the connection schematic diagram between the abutting support plate and the limit plate and the inflatable airbag; Figure 10 is the connection schematic diagram between the fixed thread sleeve and the cleaning assembly; Among them, 1 is a moving seat, 2 is a mud storage and mixing device, 3 is a multi-stage telescopic support rod, 4 is a grouting mechanism, 5 is a hoisting mechanism, 6 is a cooperating adjusting rod, 7 is a grounding seat, 8 is a limit pin, 9 is a pumping grouting machine, 10 is a fixed pulley seat, 11 is a support block, 12 is a limit groove, 13 is a limit strip, 14 is a contact spring, 15 is a telescopic rod, 16 is a threaded sleeve, 17 is a threaded rod, 18 is a counterweight rod, 19 is a connecting head, 20 is a support sealing assembly, 21 is a grouting anchor rod, 22 is a fixed threaded sleeve, 23 is a cooperating threaded sleeve, 24 is a contact pad, 25 is a pneumatic detection column, 26 is a first connecting clamp, 27 is an inflatable airbag, 28 is a first regulating valve, 29 is a second regulating valve, 30 is a limit plate, 31 is a threaded column, 32 is a locking nut, 33 is a second connecting clamp, 34 is a water delivery sub-pipe, 35 is a water delivery main pipe, 36 is a return pipe, 37 is an adjusting bolt, 38 is a pushing clamping plate, 39 is an extrusion air cushion, 40 is a return groove, 41 is a contact support plate. Detailed implementation manners

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail in combination with embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solutions of the present invention will be described in detail below in combination with embodiments and drawings, but the protection scope is not limited by this.

[0019] As Figure 1 As shown in Fig. 10, the present invention provides a post-grouting construction device for ramming-expanded cast-in-place piles, including a moving seat 1. A mud storage and mixing device 2, a hoisting mechanism 5, and a pumping grouting machine 9 are arranged on the upper end of the moving seat 1. The mud storage and mixing device 2 is connected to the pumping grouting machine 9. A liftable support frame is fixedly arranged on the front side of the upper end of the moving seat 1. A fixed pulley is arranged on the upper end of the support frame. The hoisting mechanism 5 includes a drum, and a steel wire is wound around the outside of the drum. One end of the steel wire away from the drum bypasses the fixed pulley and is fixedly provided with a grouting mechanism 4. The grouting mechanism 4 includes a counterweight rod 18. The counterweight rod 18 is connected to the steel wire. The lower end of the counterweight rod 18 is connected to a grouting anchor rod 21 through a connecting head 19. A support sealing assembly 20 is arranged outside the grouting anchor rod 21. The support sealing assembly 20 is clamped at the orifice of the cast-in-place pile.

[0020] A moving wheel is rotatably arranged at each of the four corners of the lower end surface of the moving seat 1, and the whole device is driven to move by the four moving wheels.

[0021] The hoisting mechanism 5 further includes a hoisting motor, and the output shaft of the hoisting motor is fixedly connected to the rotating shaft of the drum. The rotating shaft of the drum is horizontally arranged along the left-right direction, and the rotating shaft of the drum is rotatably arranged on the upper end of the moving seat 1. The hoisting motor drives the drum to rotate, so as to release or wind the steel wire, and further adjust the height of the grouting anchor rod 21 and the support sealing assembly 20.

[0022] The support frame includes two vertical multi-stage telescopic support rods 3, four matching adjustment rods 6 and a horizontal support block 11. The lower ends of the two multi-stage telescopic support rods 3 are respectively fixedly connected to both sides of the front end of the upper surface of the moving seat 1, and the upper ends of the two multi-stage telescopic support rods 3 are respectively fixedly connected to the left and right ends of the lower surface of the support block 11. Two telescopic matching adjustment rods 6 are rotatably arranged at the upper end of each multi-stage telescopic support rod 3. The lower end of one of the matching adjustment rods 6 is hinged to the upper end of the moving seat 1, and the lower end of the other matching adjustment rod 6 is connected to the ground.

[0023] The multi-stage telescopic support rod 3 is formed by multiple nested support rods sleeved with each other. A plurality of limit holes are arranged along the axial direction of each nested support rod, and the same limit pin 8 is inserted into the limit holes of two adjacent nested support rods, so as to fix the two adjacent nested support rods. By corresponding different limit holes on two adjacent nested support rods, the length of the multi-stage telescopic support rod 3 can be adjusted, and further the height of the support block 11 can be adjusted. The upper end of the uppermost nested support rod is fixedly connected to the lower surface of the support block 11 through a connecting seat.

[0024] The matching adjustment rod 6 includes a telescopic rod 15, a threaded sleeve 16 and a threaded rod 17. The telescopic rod 15 includes an inner rod and an outer cylinder. The inner rod is slidably inserted into the upper end opening of the outer cylinder. A resilient latch is arranged on the outer side surface of the inner rod, and a row of latch holes is arranged along the axial direction on the outer wall of the outer cylinder. The latch on the inner rod is inserted into one of the latch holes of the outer cylinder. When the outer cylinder is fixed and the inner rod is pulled forcefully, the latch can be pushed back and moved to another latch hole, so as to realize the length adjustment of the telescopic rod 15, and further realize the coarse adjustment of the length of the matching adjustment rod 6. A threaded sleeve 16 is rotatably arranged at the lower end of the outer cylinder of the telescopic rod 15. The axis of the threaded sleeve 16 coincides with the axis of the telescopic rod 15, and a threaded rod 17 is screwed into the lower end opening of the threaded sleeve 16. When the threaded sleeve 16 is rotated relative to the outer cylinder of the telescopic rod 15, since the threaded sleeve 16 is screwed with the threaded rod 17, the threaded rod 17 is controlled to slide inside the threaded sleeve 16, and further the fine adjustment of the length of the matching adjustment rod 6 is realized.

[0025] The two cooperating adjusting rods 6 are respectively located at the rear side of the multi-stage telescopic support rod 3 and on the side away from the other multi-stage telescopic support rod 3. The upper end of the inner rod of the telescopic rod 15 of the cooperating adjusting rod 6 located at the rear side is hinged to the connecting seat at the upper end of the multi-stage telescopic support rod 3, and the lower end of the threaded rod 17 of the cooperating adjusting rod 6 located at the rear side is rotatably connected to the hinge seat fixedly arranged at the upper end of the moving seat 1. The upper end of the inner rod of the telescopic rod 15 of the cooperating adjusting rod 6 located on the side away from the other multi-stage telescopic support rod 3 is hinged to the connecting seat at the upper end of the multi-stage telescopic support rod 3, and a grounding seat 7 is rotatably arranged at the lower end of the threaded rod 17 of the cooperating adjusting rod 6 located on the side away from the other multi-stage telescopic support rod 3. The grounding seat 7 is fixedly arranged on the ground by a ground nail. The hinge axes at the upper and lower ends of the cooperating adjusting rod 6 located at the rear side are both horizontally arranged along the left-right direction, and the hinge axes at the upper and lower ends of the cooperating adjusting rod 6 located on the side away from the other multi-stage telescopic support rod 3 are both horizontally arranged along the front-back direction.

[0026] A sliding groove extending in the front-back direction is provided in the middle of the lower end surface of the support block 11. A clamping groove extending in the front-back direction is respectively provided at the upper ends of the left and right inner walls of the sliding groove. A row of limiting grooves 12 is arranged along the front-back direction at the inner bottom surface of each clamping groove, and the limiting grooves 12 at the inner bottom surfaces of the two clamping grooves correspond to each other. The same horizontal sliding plate is slidably arranged inside the two clamping grooves. The sliding plate slides horizontally along the front-back direction. A fixed pulley seat 10 is fixedly arranged in the middle of the lower end surface of the sliding plate. The fixed pulley seat 10 is slidably arranged inside the sliding groove along the front-back direction. The fixed pulley is rotatably arranged inside the fixed pulley seat 10. Horizontally left-right limiting strips 13 are respectively fixedly arranged on the left and right sides of the lower end surface of the sliding plate. The two limiting strips 13 are respectively clamped inside one of the limiting grooves 12 inside the two clamping grooves. A plurality of vertical abutting springs 14 are fixedly arranged at the upper end of the sliding plate. The upper ends of the abutting springs 14 are connected to the upper end surfaces of the clamping grooves. By clamping the limiting strips 13 on the sliding plate inside different limiting grooves 12, the front-back position of the fixed pulley can be adjusted. The abutting springs 14 ensure the stable positions of the sliding plate and the fixed pulley seat 10.

[0027] The counterweight rod 18 is kept vertical. The upper end of the counterweight rod 18 is fixedly connected to the end of the steel wire away from the reel. The grouting anchor rod 21 is kept vertical. The upper end of the grouting anchor rod 21 is fixedly connected to the lower end of the counterweight rod 18 through a connector 19. The connector 19 is communicated with the inside of the grouting anchor rod 21. A grouting port is provided on the side wall of the connector 19. The grouting port is connected to a pumping grouting machine 9 through a grouting pipe. A plurality of grouting holes are equidistantly arranged on the side wall of the lower half section of the grouting anchor rod 21. The equidistant distribution of the grouting holes enables the slurry to be uniformly injected, improving the grouting quality and efficiency and ensuring the strength and stability of the ramming-expanded cast-in-place pile.

[0028] The support and seal assembly 20 includes an abutting support plate 41, an air pump connecting pipe, a fixed threaded sleeve 22, a mating threaded sleeve 23, and an inflatable airbag 27.

[0029] The abutting support plate 41 is a horizontally arranged circular plate-like structure. A circular mounting hole is provided at the center of the abutting support plate 41, and the inner diameter of the mounting hole is larger than the outer diameter of the grouting anchor rod 21. A fixed threaded sleeve 22 is fixedly provided on the upper side of the mounting hole. The fixed threaded sleeve 22 is a cylindrical structure with openings at both the upper and lower ends, and an external thread is provided on the outer side surface of the fixed threaded sleeve 22. An externally threaded mating threaded sleeve 23 is screwed onto the outside of the fixed threaded sleeve 22. The mating threaded sleeve 23 is a cylindrical structure with an opening at the lower end, and an internal thread is provided on the inner side surface of the mating threaded sleeve 23. The lower opening of the mating threaded sleeve 23 is screwed onto the outside of the fixed threaded sleeve 22. A circular through hole is provided at the center of the top plate of the mating threaded sleeve 23, and a circular ring-shaped abutting pad 24 is provided inside the through hole. A pressure detection column 25 is provided on the top plate of the mating threaded sleeve 23.

[0030] Two symmetrically arranged vertical threaded columns 31 are provided on the lower end surface of the abutting support plate 41. A common horizontal circular ring-shaped limiting plate 30 is slidably sleeved on the outside of the two threaded columns 31. A locking nut 32 is screwed onto the lower end of each of the two threaded columns 31, and both locking nuts 32 are in contact with the lower end surface of the limiting plate 30. An annular inflatable airbag 27 is provided between the limiting plate 30 and the abutting support plate 41, and the inflatable airbag 27 is sleeved on the outside of the two threaded columns 31. When the two locking nuts 32 are tightened, the limiting plate 30 and the abutting support plate 41 squeeze the inflatable airbag 27, causing the inflatable airbag 27 to tightly squeeze against the inner wall at the orifice of the cast-in-place pile, thereby sealing the orifice of the cast-in-place pile. By supporting and protecting the inflatable airbag 27 with the limiting plate 30 and the abutting support plate 41, it is possible to prevent the inflatable airbag 27 from overexpanding or being damaged, extend the service life of the support and seal assembly 20, improve the reliability and durability of the overall device, and enable the inflatable airbag 27 to better expand and fit towards the side.

[0031] The grouting anchor rod 21 sequentially passes downward through the mating threaded sleeve 23, the fixed threaded sleeve 22, the abutting support plate 41, the inflatable airbag 27, and the limiting plate 30 and then extends into the orifice of the cast-in-place pile. The abutting pad 24 inside the through hole of the mating threaded sleeve 23 is in close contact with the outer side surface of the grouting anchor rod 21, thereby ensuring the sealing performance at the through hole. Two symmetrically arranged limiting protrusions are fixedly provided inside the mounting hole of the abutting support plate 41, and the two limiting protrusions are in contact with the outer side surface of the grouting anchor rod 21.

[0032] A plurality of first connection rings 26 are fixedly provided on the upper end surface of the abutting support plate 41, and a plurality of second connection rings 33 are fixedly provided on the lower end surface of the limiting plate 30.

[0033] A first regulating valve 28 is fixedly arranged at the upper end of the abutting support plate 41. The first regulating valve 28 is a two-position three-way valve. The inlet of the first regulating valve 28 is connected to the outlet of the air pump through an air pump connecting pipe. An air inlet pipe is fixedly arranged at the first outlet of the first regulating valve 28. The air inlet pipe directly penetrates through the abutting support plate 41 and extends into the interior of the cast-in-place pile hole opening. The second outlet of the first regulating valve 28 is directly connected to the inflatable airbag 27 through an air supply pipe. A second regulating valve 29 is arranged on the air supply pipe. The first regulating valve 28 can switch between the two outlets, so as to selectively output the compressed gas entering the first regulating valve 28 to one of the outlets.

[0034] A cleaning assembly is arranged inside the fixed thread sleeve 22. The cleaning assembly includes a total water delivery pipe 35, a water delivery branch pipe 34, a pushing card plate 38, an adjusting bolt 37, an extrusion air cushion 39, and a return pipe 36.

[0035] A total water delivery pipe 35 is arranged at the lower end of the outer side surface of the fixed thread sleeve 22. A circle of vertical water delivery branch pipes 34 is arranged inside the side wall of the fixed thread sleeve 22. The upper ends of the water delivery branch pipes 34 extend into the fixed thread sleeve 22, and spray heads are fixedly arranged at the upper ends of the water delivery branch pipes 34. The lower ends of all the water delivery branch pipes 34 are connected to the total water delivery pipe 35 through an annular connecting pipe. The total water delivery pipe 35 outputs water flow to each water delivery branch pipe 34 through the connecting pipe, and sprays out from the spray heads at the upper ends of the water delivery branch pipes 34 into the fixed thread sleeve 22.

[0036] Two symmetrical semi-circular chutes are arranged at the lower end of the inner wall of the fixed thread sleeve 22. A semi-circular pushing card plate 38 is slidably arranged in each chute. Two symmetrically arranged adjusting bolts 37 are screwed on the lower end of the outer wall of the fixed thread sleeve 22. The axis of the adjusting bolt 37 is arranged along the radial direction of the fixed thread sleeve 22. The inner end of the adjusting bolt 37 is rotatably connected to the outer side surface of the pushing card plate 38 on the same side. When the two adjusting bolts 37 are rotated, since the adjusting bolts 37 are screwed with the fixed thread sleeve 22, the adjusting bolts 37 are driven to slide along the radial direction of the fixed thread sleeve 22, thereby driving the two pushing card plates 38 to approach or move away from each other. A semi-circular extrusion air cushion 39 is fixedly arranged on the inner side surface of each pushing card plate 38. An arc-shaped return groove 40 is arranged on the upper end surface of each pushing card plate 38, and the inner bottom surface of the return groove 40 is inclined. A return pipe 36 is arranged at the lower end of the outer side surface of the fixed thread sleeve 22. The inner end of the return pipe 36 is connected to the lowest part inside the two return grooves 40.

[0037] The present invention also provides a construction method for a post-grouting construction device of a rammed-expanded cast-in-place pile, including the following steps: Step 1: First, power on all electrical components, and then move the entire construction device near the construction site of the rammed and expanded cast-in-place pile; after the equipment arrives, lock the moving wheels on the moving seat 1 to ensure the overall stability of the device; before starting the preparatory work, first add raw materials such as cement, water, and additives into the mud storage and mixing equipment 2 according to a specific ratio, and stir and mix these raw materials evenly to form a slurry with appropriate viscosity and fluidity; then adjust the lengths of the two multi-stage telescopic support rods 3 inside the support frame so that the height of the support block 11 meets the working requirements; adjust the lengths of the four cooperating adjusting rods 6 so that the lower ends of the two cooperating adjusting rods 6 are hinged to the hinge seats on the upper end of the moving seat 1, and the grounding seats 7 at the lower ends of the other two cooperating adjusting rods 6 are fixedly connected to the ground through ground nails, and support the overall device through the four cooperating adjusting rods 6 to enhance stability and avoid sliding or displacement during construction; after the support frame is installed, adjust the front and rear positions of the fixed pulley seat 10; connect the end of the wire away from the reel to the upper end of the counterweight rod 18 after passing around the fixed pulley, and at this time the counterweight rod 18 is in the highest position; connect the connector 19 to the pumping grouting machine 9 through the grouting pipe.

[0038] Step 2: Place the abutting support plate 41 on the upper end of the pile top. Then, sleeved a limiting plate 30 outside the threaded column 31 and tighten the locking nut 32 at the lower end of the threaded column 31. The limiting plate 30 and the abutting support plate 41 jointly provide a pre-pressure for the inflatable airbag 27. Then, place the abutting support plate 41 at the orifice of the cast-in-place pile hole. Install an external support rod on the first connection collar 26 at the upper end of the abutting support plate 41 and the second connection collar 33 at the lower end of the limiting plate 30 to enhance the stability of the support and sealing assembly 20. Then, threadedly connect an adjusting threaded sleeve 16 outside the fixed threaded sleeve 22. Connect the first regulating valve 28 to the air pump through an air pump connecting pipe, connect the inlet of the first regulating valve 28 to the outlet at the air supply pipe, open the second regulating valve 29, and the air pump injects compressed air into the inflatable airbag 27, causing the inflatable airbag 27 to expand and fit the inner wall of the cast-in-place pile hole to ensure the sealing performance at the orifice of the cast-in-place pile hole. After the inflatable airbag 27 is inflated, close the second regulating valve 29. Release the control wire to drive the weight rod 18 and the grouting anchor rod 21 to descend as a whole, so that the lower end of the grouting anchor rod 21 sequentially passes through the mating threaded sleeve 23, the fixed threaded sleeve 22, the abutting support plate 41, the inflatable airbag 27, and the limiting plate 30 and then extends into the cast-in-place pile hole. Stop descending after the grouting anchor rod 21 reaches the designated depth to ensure that the grouting holes on the grouting anchor rod 21 are located at appropriate positions in the cast-in-place pile hole. The abutting pad 24 inside the through hole of the adjusting threaded sleeve 16 is in close contact with the outer wall of the grouting anchor rod 21 to ensure the sealing performance at the through hole. Then, connect the inlet of the first regulating valve 28 to the outlet at the air inlet pipe, and the air pump continuously injects compressed air into the cast-in-place pile hole through the air inlet pipe to increase the pressure inside the cast-in-place pile hole, so that the inside of the cast-in-place pile hole maintains a high-pressure state. Use the air pressure detection column 25 to monitor whether the sealing performance at the inflatable airbag 27 and the abutting pad 24 meets the requirements.

[0039] Step 3: The pump-type grouting machine 9 injects the uniformly mixed grout into the grouting anchor rod 21 through the grouting pipe. The grout sprays out from the grouting holes of the grouting anchor rod 21 into the cast-in-place pile hole. The grouting pressure is precisely controlled by the pump-type grouting machine 9 and can be adjusted in real time according to the engineering requirements. During the grouting process, the operator needs to closely observe the reading of the air pressure detection column 25 to ensure that the sealing state of the support and sealing assembly 20 is good. When grouting, the weight rod 18 continuously and stably positions the grouting anchor rod 21 by its own weight and cooperates with the hoisting mechanism 5 for fine adjustment to ensure uniform grout injection. In case of blockage, the grouting anchor rod 21 can be slightly lifted by the hoisting mechanism 5 and then lowered again for dredging. The grouting speed and pressure need to be adjusted according to the specific situation of the ramming-expanded cast-in-place pile. Generally, the grouting method of slow to fast and low pressure to high pressure is adopted to ensure that the grout can fully penetrate into the soil around the pile body.

[0040] Step 4: Finally, after injecting a sufficient amount of grout according to the design requirements, turn off the pumping grouting machine 9 to stop grouting; wait for three to five minutes for the injected grout to initially solidify, and then slowly start the winch mechanism 5 to wind up the steel wire and lift the grouting anchor rod 21 out of the support and sealing assembly 20; the lifting process should be slow and uniform to avoid disturbing the initially set grout.

[0041] Step 5: Before lifting the grouting anchor rod 21, tighten the two adjusting bolts 37 so that the two pushing plates 38 approach each other, and the extrusion air cushions 39 on the two pushing plates 38 clamp the grouting anchor rod 21, thus closing the mounting holes on the abutting support plate 41. Then, inject water into the interior of the water supply main pipe 35. The water supply main pipe 35 outputs the water flow through the connecting pipes into the interior of each water distribution branch pipe 34, and sprays it out from the nozzles at the upper ends of the water distribution branch pipes 34 into the interior of the fixed threaded sleeve 22 to wash the outside of the grouting anchor rod 21. In this way, the grouting anchor rod 21 is washed while being lifted upward, and the sewage after washing enters the interior of the return groove 40, and the sewage in the interior of the return groove 40 is discharged outward through the return pipe 36.

[0042] Step 6: After the grouting anchor rod 21 is completely lifted out, remove the air pump connecting pipe between the air pump and the first regulating valve 28, connect the inlet of the first regulating valve 28 to the outlet at the air supply pipe, and open the second regulating valve 29 so that the gas inside the inflatable airbag 27 is released; then unscrew the locking nut 32 and remove the limiting plate 30; then remove the additional support rods on the first connection ring 26 and the second connection ring 33; then carefully remove the entire support and sealing assembly 20 and check its integrity for future use; during the equipment recovery stage, first remove the support block 11 from the two multi-stage telescopic support rods 3, then remove the four matching adjusting rods 6, then remove the two multi-stage telescopic support rods 3, and adjust the length of the multi-stage telescopic support rods 3 to the shortest; finally, clean the residual grout in the pumping grouting machine 9 and the relevant pipes to prevent blockage of the pipes after hardening; firmly fix the support frame on the moving seat 1, unlock the moving wheels, and push the entire device away from the construction site and move it to the next working point or storage area; after the device is used, the key components, especially the inflatable airbag 27 of the support and sealing assembly 20, should be inspected and maintained to ensure the reliability and safety for future use.

[0043] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A post-grouting construction device for ramming-expanded cast-in-place piles, characterized in that: It includes a moving seat (1). At the upper end of the moving seat (1), there are a mud storage and mixing device (2), a hoisting mechanism (5), and a pumping grouting machine (9). The mud storage and mixing device (2) is connected to the pumping grouting machine (9). At the front side of the upper end of the moving seat (1), a liftable support frame is fixedly arranged. At the upper end of the support frame, there is a fixed pulley. The hoisting mechanism (5) includes a drum. A steel wire is wound around the outside of the drum. One end of the steel wire away from the drum bypasses the fixed pulley and is fixedly provided with a grouting mechanism (4). The grouting mechanism (4) includes a counterweight rod (18). The counterweight rod (18) is connected to the steel wire. The lower end of the counterweight rod (18) is connected to a grouting anchor rod (21) through a connector (19). A support and sealing assembly (20) is arranged outside the grouting anchor rod (21). The support and sealing assembly (20) is clamped at the orifice of the cast-in-place pile.

2. The post - grouting construction device for ramming - expanding cast - in - place piles according to claim 1, characterized in that: The support frame includes two vertical multi-stage telescopic support rods (3), four matching adjustment rods (6), and a horizontal support block (11). The lower ends of the two multi-stage telescopic support rods (3) are respectively fixedly connected to both sides of the front end of the upper surface of the moving seat (1). The upper ends of the two multi-stage telescopic support rods (3) are respectively fixedly connected to the left and right ends of the lower surface of the support block (11). At the upper end of each multi-stage telescopic support rod (3), two telescopic matching adjustment rods (6) are respectively rotatably arranged. The lower end of one of the matching adjustment rods (6) is hinged to the upper end of the moving seat (1), and the lower end of the other matching adjustment rod (6) is connected to the ground.

3. The post-grouting construction device for ramming-expanded cast-in-place piles according to claim 2, wherein: The multi-stage telescopic support rod (3) is formed by multiple nested support rods sleeved with each other. Multiple limit holes are arranged on each nested support rod. The same limit pin (8) is inserted into the limit holes on two adjacent nested support rods to fix the two adjacent nested support rods. The upper end of the uppermost nested support rod is fixedly connected to the lower surface of the support block (11) through a connecting seat.

4. A post - grouting construction device for ramming - expanded cast - in - place piles according to claim 3, characterized in that: The matching adjustment rod (6) includes a telescopic rod (15), a threaded sleeve (16), and a threaded rod (17). The telescopic rod (15) includes an inner rod and an outer cylinder. The inner rod is slidably inserted into the upper opening of the outer cylinder. A threaded sleeve (16) is rotatably arranged at the lower end of the outer cylinder of the telescopic rod (15). A threaded rod (17) is screwed into the lower opening of the threaded sleeve (16). The two matching adjustment rods (6) are respectively located at the rear side of the multi-stage telescopic support rod (3) and on the side away from the other multi-stage telescopic support rod (3). The upper ends of the inner rods of the telescopic rods (15) of the two matching adjustment rods (6) are respectively hinged to the connecting seat at the upper end of the multi-stage telescopic support rod (3). The lower end of the threaded rod (17) of the matching adjustment rod (6) located at the rear side is rotatably connected to the hinge seat fixedly arranged at the upper end of the moving seat (1). The lower end of the threaded rod (17) of the matching adjustment rod (6) located on the side away from the other multi-stage telescopic support rod (3) is rotatably provided with a grounding seat (7). The grounding seat (7) is fixedly arranged on the ground through a ground nail.

5. The post-grouting construction device for ramming-expanded cast-in-place piles according to claim 2, characterized in that: A sliding groove extending front and back is provided in the middle of the lower end surface of the support block (11). A clamping groove is provided at the upper end of the left and right inner walls of the sliding groove respectively. A row of limiting grooves (12) is provided at the inner bottom surface of each clamping groove. The same sliding plate is slidably arranged inside the two clamping grooves. A fixed pulley seat (10) is fixedly arranged in the middle of the lower end surface of the sliding plate. The fixed pulley is rotatably arranged inside the fixed pulley seat (10). Limiting strips (13) are fixedly arranged on the left and right sides of the lower end surface of the sliding plate respectively. The two limiting strips (13) are respectively clamped inside one of the limiting grooves (12) inside the two clamping grooves. A plurality of vertical abutting springs (14) are fixedly arranged at the upper end of the sliding plate. The upper ends of the abutting springs (14) are connected to the upper end surfaces of the clamping grooves.

6. The post - grouting construction device for ramming - expanding cast - in - place piles according to claim 5, wherein: The counterweight rod (18) is kept vertical. The upper end of the counterweight rod (18) is fixedly connected to the end of the steel wire far from the reel. The grouting anchor rod (21) is kept vertical. The upper end of the grouting anchor rod (21) is fixedly connected to the lower end of the counterweight rod (18) through a connector (19). The connector (19) is communicated with the inside of the grouting anchor rod (21). A grouting port is provided on the side wall of the connector (19). The grouting port is connected to the pumping grouting machine (9) through a grouting pipe. A plurality of grouting holes are equidistantly arranged on the side wall of the lower half of the grouting anchor rod (21).

7. A post-grouting construction device for ramming-expanded cast-in-place piles according to claim 6, characterized in that: The support sealing assembly (20) includes an abutting support plate (41), an air pump connecting pipe, a fixed threaded sleeve (22), a mating threaded sleeve (23), and an inflatable airbag (27). The abutting support plate (41) is a horizontally arranged circular plate-like structure. An installation hole is provided at the center of the abutting support plate (41). A fixed threaded sleeve (22) is fixedly arranged above the installation hole. The fixed threaded sleeve (22) is screwed with the mating threaded sleeve (23) on the outside. A circular through hole is provided at the center of the top plate of the mating threaded sleeve (23). A circle of abutting pads (24) is arranged inside the through hole. A pressure detection column (25) is arranged on the top plate of the mating threaded sleeve (23). Two threaded columns (31) are arranged on the lower end surface of the abutting support plate (41). The same horizontally arranged circular limiting plate (30) is slidably sleeved on the outside of the two threaded columns (31). A locking nut (32) is screwed at the lower end of each of the two threaded columns (31). An inflatable airbag (27) is arranged between the limiting plate (30) and the abutting support plate (41). The inflatable airbag (27) is sleeved on the outside of the two threaded columns (31).

8. A post - grouting construction device for ramming - expanding cast - in - place piles according to claim 7, characterized in that: The grouting bolt (21) sequentially passes downward through the mating threaded sleeve (23), the fixed threaded sleeve (22), the abutting support plate (41), the inflatable airbag (27), and the limiting plate (30) and then extends into the interior of the bored pile orifice; wherein the abutting pad (24) inside the through-hole of the mating threaded sleeve (23) is in close contact with the outer side surface of the grouting bolt (21); a first control valve (28) is fixedly arranged at the upper end of the abutting support plate (41), the first control valve (28) is a two-position three-way valve, the inlet of the first control valve (28) is connected to the outlet of the air pump through an air pump connecting pipe, an air inlet pipe is fixedly arranged at the first outlet of the first control valve (28), the air inlet pipe directly passes through the abutting support plate (41) and extends into the interior of the bored pile orifice, and the second outlet of the first control valve (28) is directly connected to the inflatable airbag (27) through an air supply pipe, and a second control valve (29) is arranged on the air supply pipe.

9. The post - grouting construction device for ramming - expanded cast - in - place piles according to claim 8, characterized in that: A water delivery main pipe (35) is arranged at the lower end of the outer side surface of the fixed threaded sleeve (22), a circle of vertical water delivery branch pipes (34) is arranged inside the side wall of the fixed threaded sleeve (22), the upper ends of the water delivery branch pipes (34) extend into the fixed threaded sleeve (22), and spray heads are fixedly arranged at the upper ends of the water delivery branch pipes (34); the lower ends of all the water delivery branch pipes (34) are connected to the water delivery main pipe (35) through an annular connecting pipe, two symmetrical semi-circular chutes are arranged at the lower end of the inner wall of the fixed threaded sleeve (22), and a semi-circular pushing card plate (38) is slidably arranged inside each chute; two symmetrical adjusting bolts (37) are screwed on the lower end of the outer wall of the fixed threaded sleeve (22), and the inner ends of the adjusting bolts (37) are rotatably connected to the outer side surfaces of the pushing card plates (38) on the same side; a semi-circular extrusion air cushion (39) is fixedly arranged on the inner side surface of each pushing card plate (38); an arc-shaped return groove (40) is arranged on the upper end surface of each pushing card plate (38), and the inner bottom surface of the return groove (40) is inclined; a return pipe (36) is arranged at the lower end of the outer side surface of the fixed threaded sleeve (22), and the inner end of the return pipe (36) is connected to the lowest part inside the two return grooves (40).

10. A post - grouting construction method for ram - expanded cast - in - place piles, characterized in that, Adopt a post-grouting grouting construction device for ramming-expanded bored piles as described in claim 9, and include the following steps: Step 1, first connect the power supply to all electrical components, and then move the entire construction device to the vicinity of the ramming-expanded bored pile construction site; add raw materials into the slurry storage and mixing equipment (2), and stir and mix these raw materials evenly to form slurry; then adjust the height of the support frame, and connect the four mating adjusting rods (6) to the two multi-stage telescopic support rods (3); after the support frame is installed, adjust the front and rear positions of the fixed pulley seat (10); connect the end of the steel wire far away from the reel to the upper end of the counterweight rod (18) after passing around the fixed pulley, and at this time the counterweight rod (18) is at the highest position; connect the connector (19) to the pumping grouting machine (9) through the grouting pipe. Step 2: Place the abutting support plate (41) on the upper end of the pile top. Sleeve a limiting plate (30) outside the threaded column (31), and tighten the locking nut (32) at the lower end of the threaded column (31). The limiting plate (30) and the abutting support plate (41) jointly provide a pre-pressure for the inflatable airbag (27), and then place the abutting support plate (41) at the orifice of the cast-in-place pile hole. Then, screw the adjusting threaded sleeve (16) outside the fixed threaded sleeve (22). Connect the first regulating valve (28) to the air pump through an air pump connecting pipe, connect the inlet of the first regulating valve (28) to the outlet at the air supply pipe, open the second regulating valve (29), and the air pump injects compressed air into the inflatable airbag (27) to make the inflatable airbag (27) expand and fit the inner wall of the cast-in-place pile hole to ensure the sealing performance at the orifice of the cast-in-place pile hole. After the inflatable airbag (27) is inflated, close the second regulating valve (29). Control the release of the steel wire to drive the counterweight rod (18) and the grouting anchor rod (21) to descend as a whole, so that the lower end of the grouting anchor rod (21) sequentially passes through the mating threaded sleeve (23), the fixed threaded sleeve (22), the abutting support plate (41), the inflatable airbag (27), and the limiting plate (30) and then extends into the cast-in-place pile hole. Stop the descent of the grouting anchor rod (21) when it reaches the specified depth. The abutting pad (24) inside the through hole of the adjusting threaded sleeve (16) is in close contact with the outer wall of the grouting anchor rod (21) to ensure the sealing performance at the through hole. Then, connect the inlet of the first regulating valve (28) to the outlet at the air inlet pipe, and the air pump continuously injects compressed air into the cast-in-place pile hole through the air inlet pipe to increase the pressure inside the cast-in-place pile hole to keep the inside of the cast-in-place pile hole in a high-pressure state. Use the air pressure detection column (25) to monitor whether the sealing performance at the inflatable airbag (27) and the abutting pad (24) meets the requirements. Step 3: Inject the slurry into the grouting anchor rod (21), and the slurry sprays out from the grouting holes of the grouting anchor rod (21) into the cast-in-place pile hole. During the grouting process, the operator needs to observe the reading of the air pressure detection column (25) to ensure that the sealing state of the support sealing assembly (20) is good. Step 4: After injecting a sufficient amount of slurry according to the design requirements, stop the grouting. Wait for the injected slurry to initially solidify, and then slowly start the winch mechanism (5) to wind up the steel wire to lift the grouting anchor rod (21) out of the support sealing assembly (20). Step 5, before the grouting bolt (21) is lifted, tighten the two adjusting bolts (37) so that the two pushing plates (38) approach each other, and the extrusion air cushions (39) on the two pushing plates (38) clamp the grouting bolt (21), thereby closing the mounting holes on the abutting support plate (41); then inject water into the interior of the water delivery main pipe (35), and the water delivery main pipe (35) outputs the water flow through the connecting pipes into the interior of each water delivery branch pipe (34), and sprays the water from the nozzles at the upper ends of the water delivery branch pipes (34) into the interior of the fixed thread sleeve (22) to wash the outside of the grouting bolt (21); while the grouting bolt (21) is lifted upward, it is washed, and the sewage after washing enters the interior of the return groove (40), and the sewage in the interior of the return groove (40) is discharged outward through the return pipe (36).

Images