Construction process for recycling porous cast-in-place pile slurry

Abstract

The invention relates to the technical field of constructional engineering, in particular to a porous cast-in-place pile slurry recycling construction technology which comprises a first pile hole, a punching heavy hammer and a punching pile machine and comprises the specific operation steps that firstly, a site is leveled; step 2, positioning and paying off; thirdly, a groove is excavated; fourthly, corrugated pipes are buried, a formwork is erected, and a brick moulding bed is built; 5, concrete is poured; sixthly, protective railings are installed, and equipment such as a slurry pump and a pile driver is installed; compared with an existing porous cast-in-place pile slurry recycling construction technology, hardening measures are taken on a pile foundation construction site, it can be effectively guaranteed that a foundation of a pile foundation construction machine has enough rigidity and integrity, the influence of weather factors on pile foundation construction is small, a slurry ditch and a slurry pool are built in advance, slurry can be recycled, and the construction cost is reduced. The damage effect on undisturbed soil of the base is low, no bare soil exists in the construction process, slurry does not flow out, construction dust is reduced, site civilized construction is achieved, and the green and environment-friendly requirements reach the standard.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and specifically relates to a construction process for recycling slurry of multi-hole cast-in-place piles. Background Art

[0002] With the continuous deepening of the urbanization process, the scale of construction projects is getting larger and larger. Slurry-supported percussion cast-in-place piles have been widely used in the pile foundation construction of building projects. However, due to the use of slurry, the phenomenon of uncivilized construction sites and environmental pollution has not been effectively solved. At the same time, due to the lack of proper slurry management, there is a large amount of slurry waste and a large amount of external transportation and treatment, resulting in a high construction cost that has long existed. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction process for recycling slurry of multi-hole cast-in-place piles to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: including a first pile hole, a punching weight, a punching pile machine, a pile hole brick formwork, a corrugated pipe, a second pile hole, a first slurry pump, a first slurry delivery hose, a primary slurry sedimentation tank, a secondary slurry sedimentation tank, a tertiary slurry sedimentation tank, a first partition board, a second partition board, a second slurry pump, a second slurry delivery hose, an overflow port, a water pump, a water pipe, a slurry discharge pipe, a vibration motor, a sediment separator, a sediment pond, and a cleaning port. The specific operation steps are as follows:

[0005] Step 1: Site leveling, leveling the pile foundation construction area, removing surface shrubs, weeds, etc., to make the ground reach the flatness required for pile driving;

[0006] Step 2: Positioning and setting out lines, positioning the contour position of the foundation raft, laying out the positions of the slurry pond, slurry ditch, second pile hole, and first pile hole and making marks;

[0007] Step 3: Excavating trenches, using a small backhoe to excavate the marked slurry pond, slurry ditch, and slurry pump trench;

[0008] Step 4: Burying corrugated pipes, formwork support, and brick formwork masonry. The slurry pond is built with shale perforated bricks. After the brick formwork reaches a certain strength, the gap between the brick formwork and the pit wall is backfilled with fine-grained soil in layers and compacted with a manual rammer. A corrugated pipe is buried in the slurry ditch between the first pile hole and the second pile hole;

[0009] Step 5: Pouring concrete. After the formwork support and brick formwork masonry are completed, pour concrete into the slurry pond, the bottom of the slurry pump trench, the upper part of the buried corrugated pipe, and the area between the first pile hole and the second pile hole;

[0010] Step 6: Install equipment such as safety railings, mud pumps, and pile drivers. After pouring concrete and waiting for it to reach a certain strength, promptly install the standardized safety railings for the mud pit and the standardized punching protection net at the hole opening, and hang prohibition and warning signs. Then, assemble the punching pile driver and sediment separator on-site. Finally, install mud pumps in the mud pit and the second pile hole, prepare mud, and start pile foundation construction;

[0011] Step 7: Punch and conduct mud circulation. Before punching the punching pile, prepare mud in the mud pit. During the punching process of the punching pile, use a mud pump to pump the mud in the mud pit into the first pile hole, and the first pile hole is protected by a standardized semi-circular protective cover.

[0012] Preferably, an impact hammer is arranged inside the first pile hole, and a punching pile driver is arranged above the impact hammer. A brick formwork for the pile hole is arranged at the base of the punching pile driver. One side of the first pile hole is connected to a second pile hole through a corrugated pipe, and a first mud pump is installed inside the second pile hole. The water outlet end of the first mud pump is connected to a first mud conveying hose.

[0013] Preferably, a primary mud sedimentation tank is arranged at the water outlet of the first mud conveying hose. A secondary mud sedimentation tank is arranged on one side of the primary mud sedimentation tank, and a tertiary mud sedimentation tank is arranged on the side of the secondary mud sedimentation tank away from the primary mud sedimentation tank.

[0014] Preferably, the primary mud sedimentation tank and the secondary mud sedimentation tank are separated by a first partition board, and a lifting drainage component is installed in the middle of the first partition board.

[0015] Preferably, the lifting drainage component includes a guide rod, a sealing outer pad, an isolation filter plate, a counterweight, an irregular vertical plate, and a floating block. A sealing outer pad is arranged outside the guide rod. An isolation filter plate is installed at the upper end of the sealing outer pad, and a counterweight is installed on one side of the sealing outer pad. An irregular vertical plate is arranged above the counterweight, and a floating block is arranged above the irregular vertical plate.

[0016] Preferably, a second mud pump is installed inside the secondary mud sedimentation tank, and the water outlet end of the second mud pump is connected to a second mud conveying hose. A second partition board is installed between the secondary mud sedimentation tank and the tertiary mud sedimentation tank, and a second mud pump is arranged above the second partition board. A water pump is installed inside the tertiary mud sedimentation tank, and the water outlet end of the water pump is connected to a water pipe.

[0017] Preferably, a mud discharge pipe is connected to the lower end of the primary mud sedimentation tank, and a vibration motor is installed on the surface of the mud discharge pipe. The outlet of the vibration motor is connected to a sediment separator, and a sediment pond is arranged at the lower end of the sediment separator. A cleanable opening is arranged on one side of the sediment pond, and a pressing component is installed on the upper wall of the sediment pond.

[0018] Preferably, the pressing component includes a multi-stage hydraulic cylinder, a fixed pressing plate, a movable pressing plate, a limiting plate and an elastic member. The lower end of the multi-stage hydraulic cylinder is connected to the fixed pressing plate. One side of the fixed pressing plate is rotatably connected to the movable pressing plate, and a limiting plate is arranged at the upper end of the movable pressing plate. An elastic member is arranged at the lower end of the movable pressing plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The equipment takes hardening measures for the pile foundation construction site, which can effectively ensure that the foundation of the pile foundation construction machinery has sufficient stiffness and integrity. During pile foundation construction, it is less affected by weather factors. The mud ditch and mud pond are built in advance, and the mud can be recycled, with a low damage effect on the original soil at the base. There is no bare soil during the construction process, and the mud does not flow out, reducing construction dust, meeting the requirements of site civilized construction and green environmental protection.

[0021] 2. The buoyancy of the floating block keeps the isolation filter plate at the water surface of the primary mud sedimentation tank all the time, so that the sundries on the surface of the mud water can be filtered while the mud water flows into the secondary mud sedimentation tank. The presence of the irregular vertical plates can reduce the flow rate of water when it flows through the isolation filter plate, so as to ensure that the water in the primary mud sedimentation tank and the secondary mud sedimentation tank remains as static as possible, facilitating the sedimentation work.

[0022] 3. Through the vibration effect of the vibration motor, the sediment can flow better to the sediment separator for sediment separation, preventing the sediment from accumulating in the mud discharge pipe and affecting the flow of the sediment. The rotation structure between the movable pressing plate and the fixed pressing plate facilitates the sediment to fall into the sediment pond for collection. After collecting sediment for a period of time, the multi-stage hydraulic cylinder will drive the fixed pressing plate and the movable pressing plate to press down, discharging the water in the collected sediment as much as possible, so that the sediment pond can store as much sediment as possible and reduce the cleaning frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the process flow chart of the present invention;

[0024] Figure 2 is the schematic diagram of the mud circulation principle of the present invention;

[0025] Figure 3 is the overall structure schematic diagram of the mud circulation device of the present invention;

[0026] Figure 4 Schematic enlarged view of the pressing component of the present invention;

[0027] Figure 5 Schematic enlarged view of the lifting and drainage component of the present invention.

[0028] In the figure: 1. First pile hole; 2. Punching weight; 3. Punching pile machine; 4. Brick formwork for pile hole; 5. Bellows; 6. Second pile hole; 7. First mud pump; 8. First mud conveying hose; 9. Primary mud sedimentation tank; 10. Secondary mud sedimentation tank; 11. Tertiary mud sedimentation tank; 12. First partition board; 13. Second partition board; 14. Second mud pump; 15. Second mud conveying hose; 16. Overflow port; 17. Water pump; 18. Water pipe; 19. Mud discharge pipe; 20. Vibration motor; 21. Sediment separator; 22. Sediment pond; 23. Cleaning port; 24. Pressing component; 2401. Multi-stage hydraulic cylinder; 2402. Fixed pressing plate; 2403. Movable pressing plate; 2404. Limiting plate; 2405. Elastic member; 25. Lifting and drainage component; 2501. Guide rod; 2502. Sealing outer pad; 2503. Isolation filter plate; 2504. Counterweight; 2505. Irregular vertical plate; 2506. Floating block. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1 , Figure 2 and Figure 3 , the present invention provides a technical solution: including the first pile hole 1, punching weight 2, punching pile machine 3, brick formwork for pile hole 4, bellows 5, second pile hole 6, first mud pump 7, first mud conveying hose 8, primary mud sedimentation tank 9, secondary mud sedimentation tank 10, tertiary mud sedimentation tank 11, first partition board 12, second partition board 13, second mud pump 14, second mud conveying hose 15, overflow port 16, water pump 17, water pipe 18, mud discharge pipe 19, vibration motor 20, sediment separator 21, sediment pond 22 and cleaning port 23. The specific operation steps are as follows:

[0031] Step 1: Site leveling

[0032] Level the construction area of the pile foundation, remove surface shrubs, weeds, etc., to make the ground reach the flatness required for pile driving. During leveling, the original soil at the base shall not be disturbed. Excavate local soft soil layers and backfill with plain soil. For the filling area and around the brick formwork, backfill with plain soil and compact in layers, with a compaction degree ≥ 85%.

[0033] Step 2: Positioning and setting out

[0034] Locate the contour position of the foundation raft, lay out the positions of the slurry pit, slurry ditch, the first pile hole 1 and the second pile hole 6 and make marks. Use lime powder to mark the outer contour lines of the slurry pit and the brick formwork of the slurry ditch. Drive φ10 - φ12 steel bar heads into the soil layer at the center point of the first pile hole 1 and tie a red ribbon to facilitate subsequent search for the marked points.

[0035] Step 3: Excavate the trench

[0036] Use a small backhoe to excavate the marked slurry pit, slurry ditch and slurry pump pipe trench. The size of the slurry pit is 4 * 3 * 3m, which can be adjusted according to the site conditions. The depth of the slurry ditch and the slurry pump pipe trench is 0.6m and the width is 0.4m. During excavation, strictly control the base elevation to avoid over - excavation.

[0037] Step 4: Install the corrugated pipe 5, formwork support and build the brick formwork

[0038] After the excavation of the slurry pit, slurry ditch and slurry pump pipe trench is completed, the slurry pit is built with shale perforated bricks of 240 * 200 * 90mm. The width of the bottom 1 - meter area of the brick formwork is 400mm, and the width of the upper 2 - meter area is 200mm. The mortar strength is M5 cement mortar. The side wall of the slurry pit is plastered with M10 cement mortar. After the brick formwork reaches a certain strength, the gap between the brick formwork and the pit wall is backfilled with fine - grained soil in layers and compacted with a manual rammer; Install a corrugated pipe 5 with a diameter of 300mm in the slurry ditch between the first pile hole 1 and the second pile hole 6, and compact the outside of the corrugated pipe 5 with plain soil; Support and fix the two sides of the slurry pump pipe trench with formwork and wooden square timbers. The width of the formwork support is 0.4m. At the same time, make the outer formwork of the first pile hole 1 with galvanized thin iron sheet according to the center point of the first pile hole 1 that has been positioned, drive four φ8 steel bar heads into the soil layer and spot - weld them to the outer formwork to fix the outer formwork of the first pile hole 1. The outer formwork of the first pile hole 1 should be 10cm larger than the pile diameter size on the drawing to ensure that the steel casing has a certain space for movement during pile foundation construction. When setting up all formworks and building the brick formwork, strictly control the top elevation to ensure the flatness of the subsequent concrete pouring surface.

[0039] Step 5: Pour concrete

[0040] After the formwork erection and the brick tire mold masonry are completed, concrete is poured in the slurry pit, at the bottom of the slurry pump trench, above the buried corrugated pipe 5, and in the area between the first pile hole 1 and the second pile hole 6. For the slurry pit and the bottom of the slurry trench, 100 mm thick C15 concrete is poured. In the area between the first pile hole 1 and the second pile hole 6, since it needs to bear the self-weight of the pile driver, the live load and vibration during construction, 150 mm thick C30 concrete is poured.

[0041] Step 6: Install safety railings, slurry pumps, pile drivers and other equipment

[0042] After the concrete reaches a certain strength, install a 1.2 m high standardized safety railing for the slurry pit in a timely manner, install a standardized punching safety net at the hole opening, and hang prohibition and warning signs. Then, assemble the punching pile driver 3 and the sediment separator 21 on-site. Finally, install the slurry pump in the slurry pit and the second pile hole 6, prepare the slurry and start the pile foundation construction.

[0043] Step 7: Punch holes and slurry circulation

[0044] Before the construction of the punching pile, prepare the slurry in the slurry pit. During the punching process of the punching pile, use the second slurry pump 14 to pump the slurry in the secondary slurry sedimentation tank 10 into the first pile hole 1. The first pile hole 1 is protected by a standardized semi-circular protective cover. At the same time, a certain amount of slurry can be generated during the impact hole formation. The excess slurry flows into the adjacent second pile hole 6 through the buried corrugated pipe 5, and the slurry in the second pile hole 6 is pumped into the primary slurry sedimentation tank 9 by the first slurry pump 7. All the first slurry delivery hoses 8, the second slurry delivery hoses 15 and the cable lines of the first slurry pump 7 and the second slurry pump 14 are arranged in the slurry pump trench to meet the requirements of site civilization and cleanliness. After the slurry is filtered by the sediment separator 21 in the primary slurry sedimentation tank 9 to remove sediment and sand, it flows into the secondary slurry sedimentation tank 10 through the lifting drainage component 25. The slurry in the secondary slurry sedimentation tank 10 is pumped back into the first pile hole 1 by the second slurry pump 14, and the second slurry pump 14 and the first slurry pump 7 are used to achieve slurry circulation. An overflow port 16 and a second partition board 13 are provided between the secondary slurry sedimentation tank 10 and the tertiary slurry sedimentation tank 11. When the slurry liquid level is too high, it flows into the tertiary slurry sedimentation tank 11 through the overflow port 16. After precipitation, the clear water is pumped out by the water pump 17 for secondary use. Since the pile foundation construction site has been hardened, the water for making slurry and rainwater flow into the slurry pit through the slurry pump trench, so that the slurry water circulates in the circulation system composed of the first pile hole 1, the second pile hole 6, the slurry trench and the slurry pit, and will not pollute the site. Then, use the sediment separator 21 to discharge the dewatered sand and gravel into the sediment pool 22, and finally use the truck crane to lift the muck in the sediment pool 22 to the muck truck and transport it to the muck dump;

[0045] The primary slurry sedimentation tank 9, the secondary slurry sedimentation tank 10 and the tertiary slurry sedimentation tank 11 are collectively referred to as the slurry pit.

[0046] Taking hardening measures on the pile foundation construction site can effectively ensure that the foundation of the pile foundation construction machinery has sufficient stiffness and integrity. During pile foundation construction, it is less affected by weather factors. The mud ditches and mud pits are built in advance, and the mud can be recycled. The damage effect on the original soil at the base is low. There is no bare soil during the construction process, and the mud does not flow out, reducing construction dust, and meeting the requirements of civilized construction and green environmental protection on the site.

[0047] As Figure 3 As shown, inside the first pile hole 1, there is a punching weight 2, and above the punching weight 2, there is a punching pile machine 3. At the base of the punching pile machine 3, there is a brick formwork 4 for the pile hole. One side of the first pile hole 1 is connected to a second pile hole 6 through a corrugated pipe 5, and inside the second pile hole 6, there is a first mud pump 7. The water outlet end of the first mud pump 7 is connected to a first mud conveying hose 8.

[0048] As Figure 3 As shown, at the water outlet of the first mud conveying hose 8, there is a primary mud sedimentation tank 9. And on one side of the primary mud sedimentation tank 9, there is a secondary mud sedimentation tank 10. On the side of the secondary mud sedimentation tank 10 away from the primary mud sedimentation tank 9, there is a tertiary mud sedimentation tank 11. Inside the primary mud sedimentation tank 9, the secondary mud sedimentation tank 10, and the tertiary mud sedimentation tank 11, there are all mud detection devices. The mud detection device is a device used to detect and analyze various performance indicators of the mud. It can detect parameters such as the density, viscosity, sand content, pH value, and water loss rate of the mud. By using the mud detection device to monitor the on-site mud condition in real time, the construction progress can be guaranteed and the green construction efficiency can be improved.

[0049] As Figure 3 As shown, the primary mud sedimentation tank 9 and the secondary mud sedimentation tank 10 are separated by a first partition board 12, and in the middle of the first partition board 12, there is a lifting drainage assembly 25 installed.

[0050] As Figure 3 As shown, inside the secondary mud sedimentation tank 10, there is a second mud pump 14, and the water outlet end of the second mud pump 14 is connected to a second mud conveying hose 15. Between the secondary mud sedimentation tank 10 and the tertiary mud sedimentation tank 11, there is a second partition board 13 installed, and above the second partition board 13, there is the second mud pump 14. Inside the tertiary mud sedimentation tank 11, there is a water pump 17 for clean water, and the water outlet end of the water pump 17 for clean water is connected to a clean water pipe 18.

[0051] As Figure 3As shown, the lower end of the primary mud sedimentation tank 9 is connected to a mud discharge pipe 19, and a vibration motor 20 is installed on the surface of the mud discharge pipe 19. The outlet of the vibration motor 20 is connected to a sediment separator 21, and a sediment pond 22 is provided at the lower end of the sediment separator 21. A cleanable opening 23 is provided on one side of the sediment pond 22, and a pressing assembly 24 is installed on the upper wall of the sediment pond 22.

[0052] As Figure 5 shown, the lifting and drainage assembly 25 includes a guide rod 2501, a sealing outer pad 2502, an isolation filter plate 2503, a counterweight 2504, an irregular vertical plate 2505, and a floating block 2506. A sealing outer pad 2502 is provided outside the guide rod 2501. An isolation filter plate 2503 is installed at the upper end of the sealing outer pad 2502. A counterweight 2504 is installed on one side of the sealing outer pad 2502. An irregular vertical plate 2505 is provided above the counterweight 2504, and a floating block 2506 is provided above the irregular vertical plate 2505.

[0053] When the mud inside the primary mud sedimentation tank 9 flows into the secondary mud sedimentation tank 10, the buoyancy of the floating block 2506 enables the isolation filter plate 2503 to always be at the water surface of the primary mud sedimentation tank 9. Thus, when the muddy water flows into the secondary mud sedimentation tank 10, the sundries on the surface of the muddy water can be filtered. The presence of the irregular vertical plate 2505 can reduce the flow rate of water when it flows through the isolation filter plate 2503, thereby ensuring that the water in the primary mud sedimentation tank 9 and the secondary mud sedimentation tank 10 remains as static as possible, facilitating the sedimentation work. The counterweight 2504 facilitates the descent of the guide rod 2501 and the sealing outer pad 2502 on the first partition plate 12.

[0054] As Figure 4 shown, the pressing assembly 24 includes a multi-stage hydraulic cylinder 2401, a fixed pressing plate 2402, a movable pressing plate 2403, a limiting plate 2404, and an elastic member 2405. The lower end of the multi-stage hydraulic cylinder 2401 is connected to the fixed pressing plate 2402. The movable pressing plate 2403 is rotatably connected to one side of the fixed pressing plate 2402. A limiting plate 2404 is provided at the upper end of the movable pressing plate 2403, and an elastic member 2405 is provided at the lower end of the movable pressing plate 2403.

[0055] When collecting the sediment deposited in the first-stage mud sedimentation tank 9, the second-stage mud sedimentation tank 10, and the third-stage mud sedimentation tank 11 through the mud discharge pipe 19, the vibration effect of the vibration motor 20 can be utilized to make the sediment flow better to the sediment separator 21 for sediment separation, preventing the sediment from accumulating in the mud discharge pipe 19 and affecting the flow of the sediment. The rotation structure between the movable pressing plate 2403 and the fixed pressing plate 2402 facilitates the sediment to fall into the sediment pool 22 for collection. After collecting sediment for a certain period of time, the multi-stage hydraulic cylinder 2401 will drive the fixed pressing plate 2402 and the movable pressing plate 2403 to press down, discharging as much water as possible from the collected sediment, so that the sediment pool 22 can store as much sediment as possible and reduce the cleaning frequency.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A porous cast-in-place pile slurry recycling construction process, characterized in that: The invention comprises a first pile hole (1), a punching hammer (2), a punching pile driver (3), a pile hole brick membrane (4), a corrugated pipe (5), a second pile hole (6), a first mud pump (7), a first mud delivery hose (8), a primary mud sedimentation tank (9), a secondary mud sedimentation tank (10), a tertiary mud sedimentation tank (11), a first partition plate (12), a second partition plate (13), a second mud pump (14), a second mud delivery hose (15), an overflow port (16), a clean water pump (17), a clean water pipe (18), a mud discharge pipe (19), a vibration motor (20), a silt separator (21), a silt pool (22) and a cleaning port (23), and the specific operation steps are as follows: Step 1: Level the site, level the pile foundation construction area, remove surface shrubs, weeds, etc., so that the ground reaches the flatness required for piling; Step 2: Positioning and laying out, positioning the outline of the foundation raft, laying out the mud pool, mud trench, the second pile hole (6) and the first pile hole (1) and marking them; Step 3: Dig trenches and use a small backhoe to dig out the marked mud pool, mud trench and mud pump trench; Step 4: burying the corrugated pipe (5), supporting the formwork and laying the brick formwork, the mud pool is built with shale porous bricks, after the brick formwork reaches a certain strength, the gap between the brick formwork and the pit wall is backfilled in layers with fine-grained soil and compacted with a manual tamping machine, and the corrugated pipe (5) is buried in the mud groove between the first pile hole (1) and the second pile hole (6); Step 5: pouring concrete. After the formwork support and brick formwork are completed, concrete is poured into the mud pool, the bottom of the mud pump trench, the upper part of the buried corrugated pipe (5), and the area between the first pile hole (1) and the second pile hole (6); Step 6: Install guardrails, mud pumps, pile drivers and other equipment. After pouring concrete and waiting for it to reach a certain strength, promptly install the mud pool standardized guardrails, the hole mouth standardized punching protection net, and hang prohibition and warning signs. Then, assemble the punching pile driver (3) and the sediment separator (21) on site. Finally, install the mud pump in the mud pool and the second pile hole (6), prepare the mud and start the pile foundation construction. Step 7: punching holes and slurry circulation. Before the bored pile construction, slurry is prepared in a slurry pool. During the bored pile punching process, a slurry pump is used to pump the slurry in the slurry pool into the first pile hole (1). The first pile hole (1) is protected by a standardized semicircular protective cover.

2. A porous cast-in-place pile slurry recycling construction process according to claim 1, characterized in that: The porous cast-in-place pile mud recycling device described in step seven comprises: a punching hammer (2) is arranged inside the first pile hole (1), and a punching pile driver (3) is arranged above the punching hammer (2); a pile hole brick membrane (4) is arranged at the base of the punching pile driver (3); one side of the first pile hole (1) is connected to the second pile hole (6) via a corrugated pipe (5), and a first mud pump (7) is installed inside the second pile hole (6); and a first mud delivery hose (8) is connected to the water outlet of the first mud pump (7).

3. A porous cast-in-place pile slurry recycling device according to claim 2, characterized in that: A primary mud sedimentation tank (9) is arranged at the water outlet of the first mud delivery hose (8), and a secondary mud sedimentation tank (10) is arranged on one side of the primary mud sedimentation tank (9), and a tertiary mud sedimentation tank (11) is arranged on the side of the secondary mud sedimentation tank (10) away from the primary mud sedimentation tank (9).

4. The porous cast-in-place pile slurry recycling device according to claim 3 is characterized by: The primary mud sedimentation tank (9) and the secondary mud sedimentation tank (10) are divided by a first dividing plate (12), and a lifting and draining assembly (25) is installed in the middle of the first dividing plate (12).

5. The porous cast-in-place pile slurry recycling device according to claim 4 is characterized in that: The lifting and drainage assembly (25) comprises a guide rod (2501), a sealing outer gasket (2502), an isolation filter plate (2503), a counterweight (2504), an irregular vertical plate (2505) and a floating block (2506), wherein the sealing outer gasket (2502) is arranged outside the guide rod (2501), the isolation filter plate (2503) is installed at the upper end of the sealing outer gasket (2502), and the counterweight (2504) is installed on one side of the sealing outer gasket (2502), the irregular vertical plate (2505) is arranged above the counterweight (2504), and the floating block (2506) is arranged above the irregular vertical plate (2505).

6. The porous cast-in-place pile slurry recycling device according to claim 3 is characterized by: A second mud pump (14) is installed inside the secondary mud sedimentation tank (10), and a water outlet of the second mud pump (14) is connected to a second mud delivery hose (15); a second partition plate (13) is installed between the secondary mud sedimentation tank (10) and the tertiary mud sedimentation tank (11), and the second mud pump (14) is arranged above the second partition plate (13); a clean water pump (17) is installed inside the tertiary mud sedimentation tank (11), and a clean water pipe (18) is connected to the water outlet of the clean water pump (17).

7. The porous cast-in-place pile slurry recycling device according to claim 3 is characterized by: The lower end of the primary mud sedimentation tank (9) is connected to a mud discharge pipe (19), and a vibration motor (20) is installed on the surface of the mud discharge pipe (19). The outlet of the vibration motor (20) is connected to a mud separator (21), and a mud pool (22) is provided at the lower end of the mud separator (21). An openable cleaning port (23) is provided on one side of the mud pool (22), and a pressing assembly (24) is installed on the upper wall of the mud pool (22).

8. The porous cast-in-place pile slurry recycling device according to claim 7, characterized in that: The pressing assembly (24) comprises a multi-section hydraulic cylinder (2401), a fixed pressing plate (2402), a movable pressing plate (2403), a limiting plate (2404) and an elastic member (2405), wherein the lower end of the multi-section hydraulic cylinder (2401) is connected to the fixed pressing plate (2402), one side of the fixed pressing plate (2402) is rotatably connected to the movable pressing plate (2403), the upper end of the movable pressing plate (2403) is provided with a limiting plate (2404), and the lower end of the movable pressing plate (2403) is provided with an elastic member (2405).

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