A mud recycling device for water-borne cast-in-place piles
By designing a floating bearing and multi-stage filtration mud recycling device for underwater bored piles, the stability problem of mud recycling in the underwater construction environment was solved, realizing the immediate recycling of mud and environmental protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA STATE CONSTR PORT ENG GRP
- Filing Date
- 2026-05-14
- Publication Date
- 2026-07-14
AI Technical Summary
In the construction of underwater bored piles, existing mud recovery equipment is difficult to operate stably in environments with waves and water level changes, resulting in direct discharge of mud into water bodies and waste of mud materials.
A linked structure including a floating support unit, a mud collection unit, a multi-stage filtration unit, a mud storage unit, a conveying unit, and a return unit was designed. Through the stabilization device of the float and the support frame, the mud is separated by multi-stage filter screens and the purified mud is recovered, realizing immediate recycling.
It effectively reduces mud leakage and vibration wear, ensures continuous operation, reduces the amount of new mud used and construction costs, improves construction safety and environmental protection, and avoids water pollution.
Smart Images
Figure CN122383249A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of underwater drilling and grouting pile construction equipment and mud treatment technology, and more specifically, to an underwater drilling and grouting pile mud recovery device. Background Technology
[0002] During the construction of underwater bored piles, mud needs to be continuously injected into the pile hole to balance the pressure on the hole wall, suspend drill cuttings, and cool the drill bit. After construction is completed, if a large amount of waste mud containing drill cuttings, gravel, and fine-particle solids is directly discharged, it will cause serious pollution to the aquatic ecological environment and result in a huge waste of mud materials.
[0003] The prior art, disclosed in CN207609397U, discloses a mud conveying system suitable for underwater bored pile construction. This system includes a mud pool on land, a mud pump suspended inside the pile casing, a storage tank, a conveying ditch, and a support frame mounted on a steel trestle platform. The mud pump and storage tank are connected via pipelines. A slurry outlet pipe is located in the middle of the storage tank. The conveying ditch is inclined and mounted on the support frame, connecting the outlet pipe to the mud pool. This mud conveying system for underwater bored pile construction can transport waste mud from pile casings at different locations, is easy to clean and maintain, and can also guide the recyclable portion of the mud into the un-drilled pile casing, effectively reducing mud conveying and recycling costs.
[0004] While this device effectively reduces the cost of mud transportation and recycling, existing technologies already include mud recycling equipment for onshore bored piles, such as mud purification achieved through a combination of vibrating screens, hydrocyclones, and sedimentation tanks. However, the construction environment on water is limited by waves, water level fluctuations, and the confined space of the construction platform, making it difficult to directly apply conventional onshore equipment. Furthermore, onshore equipment typically uses fixed foundations and cannot float with the water level, resulting in the mud collection port not being stably immersed in the liquid surface. Summary of the Invention
[0005] (a) Technical problems to be solved
[0006] To address the shortcomings of existing technologies, this invention provides a mud recovery device for underwater bored piles, which solves the aforementioned problems.
[0007] (II) Technical Solution
[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a mud recovery device for underwater bored piles, comprising a floating bearing unit, a mud collection unit, a multi-stage filtration unit, a mud storage unit, a conveying unit, and a return unit, wherein each unit is interconnected to form a complete linkage structure; the floating bearing unit is located at the bottom of the device, the mud collection unit is installed on one side of the top of the floating bearing unit, the multi-stage filtration unit is connected to the discharge end of the mud collection unit, the mud storage unit is installed on the other side of the top of the floating bearing unit, the two ends of the conveying unit are respectively connected to the discharge end of the multi-stage filtration unit and the inlet end of the mud storage unit, and one end of the return unit is connected to the discharge end of the mud storage unit, and the other end extends to the construction site outside the device.
[0009] Preferably, the floating load-bearing unit consists of pontoons, a load-bearing frame, and an anti-slip pad. The pontoons are installed at the four corners of the load-bearing frame, with the top of the pontoons connected to the bottom of the load-bearing frame. The anti-slip pad is laid on the top of the load-bearing frame, covering the upper surface of the load-bearing frame. The load-bearing frame consists of main frame beams and secondary frame beams. The main frame beams are arranged in parallel, and the secondary frame beams are vertically connected between the main frame beams. The main frame beams and secondary frame beams are interconnected to form an integral frame structure.
[0010] Preferably, the mud collection unit consists of a collection tank, a seepage-proof lining, a mud inlet, and a sewage discharge port. The seepage-proof lining is laid on the inner wall of the collection tank and fits the inner surface of the collection tank. The mud inlet is installed at the top end of the collection tank and communicates with the inside of the collection tank. The sewage discharge port is installed at the bottom end of the collection tank and communicates with the inside of the collection tank. A control valve is installed on the sewage discharge port, and a flange connector is installed at the port of the mud inlet.
[0011] Preferably, the multi-stage filtration unit comprises a primary filter, a filter holder, a vibration assembly, a secondary filter housing, a precision filter, a filter pressure strip, a seal, a filter inlet, and a filter outlet. The filter holder is installed at the outlet of the collection tank and connected to the collection tank. The primary filter is installed on the filter holder, covering the opening of the filter holder. The vibration assembly is installed on the side of the filter holder, and a buffer pad is installed between the vibration assembly and the filter holder. The secondary filter housing is located below the filter holder. The filter inlet is installed on one side of the top of the secondary filter housing and connected to the outlet of the filter holder via a pipe joint. The filter outlet is installed on the other side of the bottom of the secondary filter housing. The precision filter is installed inside the secondary filter housing, and the filter pressure strip is installed on the edge of the precision filter and connected to the secondary filter housing. The seal is installed between the precision filter and the inner wall of the secondary filter housing, fitting the contact surfaces of the two.
[0012] Preferably, the mud storage unit consists of a storage tank, a level detection device, an exhaust port, and a drain valve. The storage tank is mounted on a supporting frame via a reinforcing bracket, which is installed at the bottom of the storage tank and connected to the supporting frame. The level detection device is installed on the side of the storage tank and communicates with the interior of the storage tank. A seal is installed at the connection between the level detection device and the storage tank. The exhaust port is installed at the top of the storage tank and communicates with the interior of the storage tank. A control valve is installed on the exhaust port. The drain valve is installed at the lowest point of the bottom of the storage tank and communicates with the interior of the storage tank.
[0013] Preferably, the conveying unit consists of a main conveying pump, a standby conveying pump, a pump mounting base, an inlet pipe, and a outlet pipe. The pump mounting base is installed on the supporting frame and located between the secondary filter box and the storage tank. The main conveying pump and the standby conveying pump are installed side by side on the pump mounting base. One end of the inlet pipe is connected to the filter outlet through a flange connector, and the other end is connected to the inlet of the main conveying pump and the standby conveying pump, respectively. One end of the outlet pipe is connected to the outlet of the main conveying pump and the standby conveying pump, respectively, and the other end is connected to the inlet of the storage tank through a flange connector. Both the inlet pipe and the outlet pipe are composed of multiple pipe sections connected by flange connectors, and sealing gaskets are installed between the flange connectors.
[0014] Preferably, the reflux unit consists of a reflux main pipe, reflux branch pipes, control valves, and flange connectors. One end of the reflux main pipe is connected to the outlet of the storage tank through the flange connectors, and the other end extends to the vicinity of the construction station. The reflux branch pipes are evenly installed on the side of the reflux main pipe and communicate with the interior of the reflux main pipe. Conical nozzles are installed at the ends of the reflux branch pipes. Control valves are installed on the reflux main pipe and each reflux branch pipe respectively. The reflux main pipe and the reflux branch pipes are connected by welding.
[0015] Preferably, the reinforcing brackets are connected to the mud collection unit, the conveying unit, and the mud storage unit respectively; the reinforcing bracket for fixing the mud collection unit is installed on the top of the bearing frame and fits against the bottom of the collection tank, and a buffer pad is installed between the reinforcing bracket and the collection tank; the reinforcing bracket for fixing the conveying unit is installed on the top of the bearing frame and connected to the bottom of the pump mounting base; all the reinforcing brackets are connected to the bearing frame, and the whole structure forms a linkage support structure with the bearing frame.
[0016] Preferably, the mud collection unit and the multi-stage filtration unit are connected via pipe joints and seals, with the seals fitting at the connection point; the multi-stage filtration unit and the conveying unit are connected via flange connectors and gaskets, with the gaskets fitting between the flange connectors; the conveying unit and the mud storage unit are connected via flange connectors and gaskets, with the gaskets fitting between the flange connectors; and the mud storage unit and the return unit are connected via flange connectors and gaskets, with the gaskets fitting between the flange connectors.
[0017] Preferably, all metal parts are connected by welding or bolts. The float and the load-bearing frame, the main beam and the secondary beam, and the reinforcing bracket and the load-bearing frame are all connected by welding. The anti-slip pad and the load-bearing frame, the primary filter and the filter fixing frame, and the filter pressure strip and the secondary filter box are all connected by bolts. All bolts are equipped with anti-loosening nuts that fit snugly against the bolt head.
[0018] (III) Beneficial Effects
[0019] Compared with the prior art, the present invention provides a mud recovery device for underwater bored piles, which has the following beneficial effects: 1. This underwater drilling and grouting pile mud recovery device forms a complete underwater mud recovery and processing chain through the sequential interconnection of a floating bearing unit, a mud collection unit, a multi-stage filtration unit, a conveying unit, a mud storage unit, and a return unit. The float in the floating bearing unit works in conjunction with the bearing frame to ensure that the entire device floats stably on the water surface. The collection tank separates coarse slag and fine particles in the mud through a seepage-proof lining and primary and precision filters in the multi-stage filtration unit, effectively reducing the risk of blockage of the subsequent conveying pump. The conveying unit uses a main pump and a backup pump installed in parallel to ensure continuous operation. The return main pipe and multiple return branch pipes evenly send the recovered mud back to the construction site, realizing the immediate recycling of mud and significantly reducing the amount of new mud used and construction costs in underwater drilling and grouting pile construction.
[0020] 2. This underwater drilling and grouting pile mud recovery device features sealed connections between units via flanges, seals, and pipe joints. The entire device utilizes a welded and bolted metal linkage structure. A seepage-proof lining adheres to the inner wall of the collection tank. Buffer pads are installed between the vibration components and the filter screen mounting bracket to effectively reduce mud leakage and vibration wear. The storage tank is equipped with a liquid level detection device and an exhaust port. A sewage discharge port and valve allow for the periodic removal of sediment. All bolt heads are fitted with anti-loosening nuts to ensure reliable connections in underwater operating environments. Waste mud is recovered and treated on-site, preventing direct discharge into water bodies. Simultaneously, a return unit sends the purified mud back into the borehole, reducing environmental pollution and improving construction safety and environmental friendliness. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the floating load-bearing unit structure of the present invention; Figure 3 This is a schematic diagram of the mud collection unit structure of the present invention; Figure 4 This is a schematic diagram of the multi-stage filtration unit structure of the present invention; Figure 5This is a schematic diagram of the mud storage unit structure of the present invention; Figure 6 This is a schematic diagram of the conveying unit structure of the present invention; Figure 7 This is a schematic diagram of the recirculation unit structure of the present invention.
[0022] In the diagram: 1. Floating support unit; 2. Sludge collection unit; 3. Multi-stage filtration unit; 4. Sludge storage unit; 5. Conveying unit; 6. Return unit; 7. Float; 8. Support frame; 9. Anti-slip pad; 10. Collection tank; 11. Impermeable lining; 12. Sludge inlet; 13. Sewage outlet; 14. Primary filter screen; 15. Filter screen holder; 16. Vibration assembly; 17. Secondary filter housing; 18. Precision filter screen; 19. Filter screen retaining strip. 20. Sealing components; 21. Filter inlet; 22. Filter outlet; 23. Storage tank; 24. Liquid level detection components; 25. Vent port; 26. Drain valve; 27. Main transfer pump; 28. Standby transfer pump; 29. Pump mounting base; 30. Feed pipe; 31. Discharge pipe; 32. Main return pipe; 33. Branch return pipe; 34. Control valve; 35. Flange connector; 36. Reinforcing bracket; 37. Buffer gasket; 38. Pipe joint. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0024] Please see Figures 1-7 The present invention provides a technical solution: A mud recovery device for underwater bored piles includes a floating support unit 1, a mud collection unit 2, a multi-stage filtration unit 3, a mud storage unit 4, a conveying unit 5, and a return unit 6. The floating support unit 1 is located at the bottom of the entire device. The mud collection unit 2 is installed on one side of the top of the floating support unit 1. The multi-stage filtration unit 3 is connected to the discharge end of the mud collection unit 2. The mud storage unit 4 is installed on the other side of the top of the floating support unit 1. Both ends of the conveying unit 5 are connected to the discharge end of the multi-stage filtration unit 3 and the inlet end of the mud storage unit 4, respectively. One end of the return unit 6 is connected to the discharge end of the mud storage unit 4, and the other end extends to the construction site outside the device.
[0025] The floating load-bearing unit 1 consists of pontoons 7, a load-bearing frame 8, and an anti-slip pad layer 9. Four pontoons 7 are installed at the four corners of the load-bearing frame 8, with the top of each pontoon 7 fixedly connected to the bottom of the load-bearing frame 8. The anti-slip pad layer 9 is laid on top of the load-bearing frame 8, covering its entire upper surface. The load-bearing frame 8 consists of main frame beams and secondary frame beams. Two main frame beams are arranged in parallel, and multiple secondary frame beams are vertically connected between the two main frame beams. The main frame beams and secondary frame beams are welded together to form an integral frame structure.
[0026] The mud collection unit 2 consists of a collection tank 10, a seepage-proof lining 11, a mud inlet 12, and a sewage discharge port 13. The seepage-proof lining 11 is laid on the inner wall of the collection tank 10, with its outer surface adhering to the inner surface of the collection tank 10. The mud inlet 12 is installed at the top end of the collection tank 10, with its lower opening communicating with the interior of the collection tank 10. The sewage discharge port 13 is installed at the bottom end of the collection tank 10, with its upper opening communicating with the interior of the collection tank 10. A control valve 34 is installed on the pipe of the sewage discharge port 13, and a flange connection 35 is installed at the port of the mud inlet 12.
[0027] The multi-stage filtration unit 3 consists of a primary filter screen 14, a filter screen holder 15, a vibration assembly 16, a secondary filter housing 17, a precision filter screen 18, a filter screen retaining strip 19, a sealing element 20, a filter inlet 21, and a filter outlet 22. The filter screen holder 15 is installed at the outlet of the collection tank 10, and its inlet end is fixedly connected to the outlet of the collection tank 10. The primary filter screen 14 is installed on the filter screen holder 15, and its four edges cover and are fixed to the opening of the filter screen holder 15. The vibration assembly 16 is installed on the side of the filter screen holder 15, and a buffer pad 37 is installed between the vibration assembly 16 and the filter screen holder 15. The secondary filter housing 17 is located directly below the filter screen holder 15. The filter inlet 21 is installed on the top side of the secondary filter housing 17, and is connected to the outlet end of the filter screen holder 15 via a pipe connector 38. The filter outlet 22 is installed on the other side of the bottom of the secondary filter housing 17. A precision filter screen 18 is installed inside the secondary filter housing 17, with its edges pressed and fixed by a filter screen retaining strip 19. The filter screen retaining strip 19 is bolted to the inner wall of the secondary filter housing 17. A sealing element 20 is installed between the precision filter screen 18 and the inner wall of the secondary filter housing 17, with its two sides respectively fitting against the edge of the precision filter screen 18 and the inner wall of the secondary filter housing 17.
[0028] The mud storage unit 4 consists of a storage tank 23, a level detection element 24, an venting port 25, and a drain valve 26. The storage tank 23 is mounted on a supporting frame 8 via a reinforcing bracket 36. The upper end of the reinforcing bracket 36 is fixed to the bottom of the storage tank 23, and the lower end of the reinforcing bracket 36 is fixed to the upper surface of the supporting frame 8. The level detection element 24 is installed on the side of the storage tank 23, and its connection port communicates with the interior of the storage tank 23. A seal 20 is installed at the connection between the level detection element 24 and the storage tank 23. The venting port 25 is installed on the top of the storage tank 23, and its lower end communicates with the interior of the storage tank 23. A control valve 34 is installed on the pipe of the venting port 25. The drain valve 26 is installed at the lowest point of the bottom of the storage tank 23, and its inlet end communicates with the interior of the storage tank 23.
[0029] The conveying unit 5 consists of a main conveying pump 27, a standby conveying pump 28, a pump mounting base 29, an inlet pipe 30, and an outlet pipe 31. The pump mounting base 29 is installed on the upper surface of the supporting frame 8, located between the secondary filter housing 17 and the storage tank 23. The main conveying pump 27 and the standby conveying pump 28 are installed side-by-side on the upper surface of the pump mounting base 29. One end of the inlet pipe 30 is connected to the filter outlet 22 via a flange connector 35, and the other end of the inlet pipe 30 is connected to the inlet of the main conveying pump 27 and the inlet of the standby conveying pump 28, respectively. One end of the outlet pipe 31 is connected to the outlet of the main conveying pump 27 and the outlet of the standby conveying pump 28, respectively, and the other end of the outlet pipe 31 is connected to the inlet of the storage tank 23 via a flange connector 35. Both the feed pipe 30 and the discharge pipe 31 are composed of multiple pipe sections connected in sequence by flange connectors 35, and sealing gaskets are installed between the opposite faces of every two flange connectors 35.
[0030] The reflux unit 6 consists of a main reflux pipe 32, reflux branch pipes 33, control valves 34, and flange connections 35. One end of the main reflux pipe 32 is connected to the outlet of the storage tank 23 via the flange connection 35, and the other end extends to the vicinity of the construction station. Multiple reflux branch pipes 33 are evenly installed on the side of the main reflux pipe 32. The inlet end of each reflux branch pipe 33 communicates with the interior of the main reflux pipe 32, and a conical nozzle is installed at the end of each reflux branch pipe 33. Control valves 34 are installed on the main reflux pipe 32 and on each reflux branch pipe 33. The connection between the main reflux pipe 32 and the reflux branch pipes 33 is fixed by welding.
[0031] There are three sets of reinforcing brackets 36, which are connected to the mud collection unit 2, the conveying unit 5, and the mud storage unit 4, respectively. The reinforcing bracket 36 for fixing the mud collection unit 2 is installed on the top of the supporting frame 8, with its upper surface fitting against the bottom of the collection tank 10. A buffer pad 37 is installed between the reinforcing bracket 36 and the collection tank 10. The reinforcing bracket 36 for fixing the conveying unit 5 is installed on the top of the supporting frame 8, with its upper surface fixedly connected to the bottom of the pump mounting base 29. The reinforcing bracket 36 for fixing the mud storage unit 4 is installed on the top of the supporting frame 8, with its upper surface fixedly connected to the bottom of the storage tank 23. The lower ends of all the reinforcing brackets 36 are fixedly connected to the upper surface of the supporting frame 8. The three sets of reinforcing brackets 36 and the supporting frame 8 together form an integrated, interconnected support structure.
[0032] The mud collection unit 2 is connected to the multi-stage filtration unit 3 as follows: the outlet of the collection tank 10 is connected to the inlet of the filter screen holder 15 via a pipe joint 38, and a sealing element 20 is fitted at the two connection points between the pipe joint 38 and the collection tank 10, and between the pipe joint 38 and the filter screen holder 15. The multi-stage filtration unit 3 is connected to the conveying unit 5 as follows: the filter outlet 22 is connected to the inlet of the feed pipe 30 via a flange connector 35, and a sealing gasket is fitted between the two flanges of the flange connector 35. The conveying unit 5 is connected to the mud storage unit 4 as follows: the outlet of the discharge pipe 31 is connected to the inlet of the storage tank 23 via a flange connector 35, and a sealing gasket is fitted between the two flanges of the flange connector 35. The mud storage unit 4 is connected to the return unit 6 as follows: the outlet of the storage tank 23 is connected to the inlet of the return main pipe 32 via a flange connector 35, and a sealing gasket is fitted between the two flanges of the flange connector 35.
[0033] All metal parts are connected by welding or bolting, depending on the connection requirements. The connection between the float 7 and the load-bearing frame 8 is welded; the connection between the main beam and secondary beam of the load-bearing frame 8 is welded; and the connection between each set of reinforcing brackets 36 and the load-bearing frame 8 is welded. The anti-slip pad 9 is connected to the upper surface of the load-bearing frame 8 by multiple bolts; the primary filter screen 14 is connected to the filter screen fixing frame 15 by multiple bolts; and the filter screen pressure strip 19 is connected to the secondary filter box 17 by multiple bolts. All bolts are fitted with anti-loosening nuts, each nut fitting snugly against the head of the corresponding bolt. Example 2
[0034] Based on Embodiment 1, the collection tank 10 of the mud collection unit 2 is made of stainless steel, and the seepage-proof lining 11 is a polyurethane coating with a thickness of 3mm. The flange connector 35 installed at the mud inlet 12 is a DN150 flange. The control valve 34 installed on the sewage discharge port 13 is a ball valve. The vibration assembly 16 is an eccentric vibration motor, and its housing is attached to the side of the filter screen fixing frame 15 through a buffer gasket 37, which is a rubber gasket with a thickness of 5mm. The precision filter screen 18 in the secondary filter box 17 has a double-layer structure, with the upper filter screen having a pore size of 0.5mm and the lower filter screen having a pore size of 0.2mm. The filter screen pressure strip 19 is an aluminum alloy profile, which is fixed to the inner wall of the secondary filter box 17 by M8 bolts. The sealing element 20 is a nitrile rubber strip with a rectangular cross-section and a width of 10mm.
[0035] The storage tank 23 has a volume of 2 cubic meters. The liquid level detection element 24 is a magnetic float level gauge. The upper and lower connection ports of the liquid level detection element 24 are connected to the upper and lower openings on the side wall of the storage tank 23, respectively. The sealing element 20 is a polytetrafluoroethylene gasket. The control valve 34 installed on the exhaust port 25 is a shut-off valve. The drain valve 26 is a butterfly valve.
[0036] Both the main pump 27 and the standby pump 28 are centrifugal slurry pumps, with the pump body made of high-chromium cast iron. The pump mounting base 29 is a platform welded from I-beams, and its bottom is fixed to the upper surface of the reinforcing bracket 36 by bolts. The feed pipe 30 and the discharge pipe 31 are both seamless steel pipes with a wall thickness of 5mm. The flange connection 35 between each pipe section is a DN100 flange, and the sealing gasket is an asbestos rubber sheet.
[0037] The main return pipe 32 is a DN80 galvanized steel pipe, and the branch return pipe 33 is a DN25 galvanized steel pipe. The conical nozzle at the end of each branch return pipe 33 is made of brass with a nozzle diameter of 6mm. The control valve 34 installed on the main return pipe 32 is a gate valve, and the control valve 34 installed on the branch return pipe 33 is a needle valve.
[0038] All three sets of reinforcing brackets 36 are welded from channel steel, and each has a height of 300mm. The buffer gasket 37 between the reinforcing bracket 36 used to fix the mud collection unit 2 and the collection tank 10 is a neoprene rubber gasket with a thickness of 8mm. All bolt lock nuts are nylon lock nuts.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A mud recovery device for underwater drilled cast-in-place piles, characterized in that, The device includes a floating support unit (1), a mud collection unit (2), a multi-stage filtration unit (3), a mud storage unit (4), a conveying unit (5), and a return unit (6). Each unit is connected to form a complete linkage structure. The floating support unit (1) is located at the bottom of the device. The mud collection unit (2) is installed on one side of the top of the floating support unit (1). The multi-stage filtration unit (3) is connected to the discharge end of the mud collection unit (2). The mud storage unit (4) is installed on the other side of the top of the floating support unit (1). The two ends of the conveying unit (5) are connected to the discharge end of the multi-stage filtration unit (3) and the feed end of the mud storage unit (4) respectively. One end of the return unit (6) is connected to the discharge end of the mud storage unit (4), and the other end extends to the construction station outside the device.
2. The underwater drilled pile mud recovery device according to claim 1, characterized in that, The floating load-bearing unit (1) consists of a pontoon (7), a load-bearing frame (8), and an anti-slip pad (9). The pontoon (7) is installed at the four corners of the load-bearing frame (8). The top of the pontoon (7) is connected to the bottom of the load-bearing frame (8). The anti-slip pad (9) is laid on the top of the load-bearing frame (8) and covers the upper surface of the load-bearing frame (8). The load-bearing frame (8) consists of a main frame beam and a secondary frame beam. The main frame beams are arranged in parallel, and the secondary frame beams are vertically connected between the main frame beams. The main frame beams and the secondary frame beams are connected to each other to form an overall frame structure.
3. The underwater drilled pile mud recovery device according to claim 1, characterized in that, The mud collection unit (2) consists of a collection tank (10), an impermeable lining (11), a mud inlet (12), and a sewage outlet (13). The impermeable lining (11) is laid on the inner wall of the collection tank (10) and fits the inner surface of the collection tank (10). The mud inlet (12) is installed at the top end of the collection tank (10) and communicates with the inside of the collection tank (10). The sewage outlet (13) is installed at the bottom end of the collection tank (10) and communicates with the inside of the collection tank (10). The control valve (34) is installed on the sewage outlet (13), and the flange connector (35) is installed at the port of the mud inlet (12).
4. The underwater drilled pile mud recovery device according to claim 1, characterized in that, The multi-stage filtration unit (3) consists of a primary filter screen (14), a filter screen holder (15), a vibration assembly (16), a secondary filter housing (17), a precision filter screen (18), a filter screen retaining strip (19), a sealing element (20), a filter inlet (21), and a filter outlet (22). The filter screen holder (15) is installed at the outlet of the collection tank (10) and connected to the collection tank (10). The primary filter screen (14) is installed on the filter screen holder (15) and covers the opening of the filter screen holder (15). The vibration assembly (16) is installed on the side of the filter screen holder (15), and a buffer pad (37) is installed between the vibration assembly (16) and the filter screen holder. Between the frames (15); the secondary filter box (17) is located below the filter screen fixing frame (15), the filter inlet (21) is installed on the top side of the secondary filter box (17), and is connected to the discharge end of the filter screen fixing frame (15) through the pipe joint (38); the filter outlet (22) is installed on the bottom side of the secondary filter box (17); the precision filter screen (18) is installed inside the secondary filter box (17), the filter screen pressure strip (19) is installed on the edge of the precision filter screen (18) and connected to the secondary filter box (17); the sealing element (20) is installed between the precision filter screen (18) and the inner wall of the secondary filter box (17) to fit the contact surface of the two.
5. A mud recovery device for underwater bored piles according to claim 1, characterized in that, The mud storage unit (4) consists of a storage tank (23), a liquid level detection device (24), an exhaust port (25), and a drain valve (26). The storage tank (23) is installed on the support frame (8) by a reinforcing bracket (36). The reinforcing bracket (36) is installed at the bottom of the storage tank (23) and connected to the support frame (8). The liquid level detection device (24) is installed on the side of the storage tank (23) and communicates with the inside of the storage tank (23). The sealing element (20) is installed at the connection between the liquid level detection device (24) and the storage tank (23). The exhaust port (25) is installed at the top of the storage tank (23) and communicates with the inside of the storage tank (23). The control valve (34) is installed on the exhaust port (25). The drain valve (26) is installed at the lowest point of the bottom of the storage tank (23) and communicates with the inside of the storage tank (23).
6. A mud recovery device for underwater bored piles according to claim 1, characterized in that, The conveying unit (5) consists of a main conveying pump (27), a standby conveying pump (28), a pump mounting base (29), an inlet pipe (30), and an outlet pipe (31). The pump mounting base (29) is installed on the supporting frame (8) and is located between the secondary filter box (17) and the storage tank (23). The main conveying pump (27) and the standby conveying pump (28) are installed side by side on the pump mounting base (29). One end of the inlet pipe (30) is connected to the filter outlet (21) through a flange connector (35). 2) The other end is connected to the inlet of the main conveying pump (27) and the standby conveying pump (28) respectively; one end of the discharge pipe (31) is connected to the outlet of the main conveying pump (27) and the standby conveying pump (28) respectively, and the other end is connected to the inlet of the storage tank (23) through the flange connector (35); the feed pipe (30) and the discharge pipe (31) are both composed of multiple pipe sections connected by the flange connector (35), and the sealing gasket is installed between the flange connectors (35).
7. A mud recovery device for underwater bored piles according to claim 1, characterized in that, The reflux unit (6) consists of a reflux main pipe (32), reflux branch pipes (33), control valves (34), and flange connectors (35). One end of the reflux main pipe (32) is connected to the outlet of the storage tank (23) through the flange connectors (35), and the other end extends to the vicinity of the construction site. The reflux branch pipes (33) are evenly installed on the side of the reflux main pipe (32) and communicate with the inside of the reflux main pipe (32). The conical nozzle is installed at the end of the reflux branch pipe (33). The control valves (34) are installed on the reflux main pipe (32) and each reflux branch pipe (33), and the reflux main pipe (32) and the reflux branch pipes (33) are connected by welding.
8. A mud recovery device for underwater bored piles according to claim 1, characterized in that, The reinforcing bracket (36) is connected to the mud collection unit (2), the conveying unit (5), and the mud storage unit (4) respectively; the reinforcing bracket (36) for fixing the mud collection unit (2) is installed on the top of the bearing frame (8) and fits against the bottom of the collection tank (10), and the buffer pad (37) is installed between the reinforcing bracket (36) and the collection tank (10); the reinforcing bracket (36) for fixing the conveying unit (5) is installed on the top of the bearing frame (8) and connected to the bottom of the pump mounting base (29); all the reinforcing brackets (36) are connected to the bearing frame (8), and the whole structure forms a linkage support structure with the bearing frame (8).
9. A mud recovery device for underwater bored piles according to claim 1, characterized in that, The mud collection unit (2) is connected to the multi-stage filtration unit (3) through a pipe joint (38) and a seal (20), with the seal (20) fitting at the connection between the two; the multi-stage filtration unit (3) is connected to the conveying unit (5) through a flange connector (35) and a gasket, with the gasket fitting between the flange connectors (35); the conveying unit (5) is connected to the mud storage unit (4) through a flange connector (35) and a gasket, with the gasket fitting between the flange connectors (35); the mud storage unit (4) is connected to the return unit (6) through a flange connector (35) and a gasket, with the gasket fitting between the flange connectors (35).
10. A mud recovery device for underwater bored piles according to claim 1, characterized in that, All metal parts are connected by welding or bolts. The float (7) and the load-bearing frame (8), the main beam of the frame and the secondary beam of the frame, and the reinforcing bracket (36) and the load-bearing frame (8) are all connected by welding. The anti-slip pad (9) and the load-bearing frame (8), the primary filter screen (14) and the filter screen fixing frame (15), and the filter screen pressure strip (19) and the secondary filter box (17) are all connected by bolts. All bolts are fitted with anti-loosening nuts that fit snugly against the bolt head.