Control device for adding pile foundation retaining wall slurry
The two-stage separation technology of rotating screen and cyclone assembly solves the problems of large footprint and deteriorating performance of mud sedimentation tank, and realizes construction space saving and cost reduction.
Patent Information
- Application Number
- CN202510942002.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-09-16
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the mud sedimentation tank occupies a large area, and the mud performance deteriorates due to solid phase accumulation, resulting in high construction costs and the need for frequent replacement of fresh mud.
The rotary screen and cyclone components are used for two-stage separation to replace the traditional large sedimentation tank. The rotary screen removes coarse residue and the cyclone removes fine sand to achieve efficient separation of mud.
Significantly reduce the volume and number of sedimentation tanks, reduce the risk of mud performance deterioration, reduce the number of fresh mud replacements, and reduce construction costs.
Smart Images
Figure CN120649823A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of engineering machinery, and in particular to a control device for adding slurry to pile foundation wall protection. Background Art
[0002] With the acceleration of urbanization and the rapid development of large-scale infrastructure construction, bored piles have become a core technology for deep foundation engineering due to their strong bearing capacity and adaptability to complex geology. The quality of bored pile holes is directly related to the safety and stability of buildings. When drilling in loose soil, sand, or areas with high groundwater levels, the hole walls are prone to collapse and instability. To maintain hole wall stability, slurry wall protection technology is widely used. During the circulation process, the slurry wall protects the hole wall through its hydrostatic pressure and the thin mud skin it forms. It also cools and lubricates the drill tool and carries away drill cuttings from the bottom of the hole.
[0003] Pile foundation retaining wall slurry primarily consists of a sedimentation tank, which provides space for slurry storage, circulation, and initial settling, as well as a mud pump that extracts the slurry from the bottom of the hole and delivers it to processing equipment or a circulation tank. During the drilling process, rock and soil debris broken by the drill bit mixes with the circulating mud, forming drill cuttings. This "dirty" mud, carrying a large amount of drill cuttings, is pumped from the borehole to the surface and first flows into the sedimentation tank. In the sedimentation tank, due to the reduced flow rate and increased volume, the denser drill cuttings settle to the bottom of the tank under gravity. After settling, the mud in the upper part of the tank becomes relatively clean, with a significantly reduced density and sand content.
[0004] In order to achieve effective sedimentation effect, the sedimentation tank needs to have sufficient length, width and depth to ensure that the mud stays in it for a long enough time. It occupies a large area. The sedimentation tank mainly relies on gravity to remove drilling cuttings. During the mud extraction process, the sedimentation tank will be stirred, so that some particles will be brought into the mud pool. After a long period of circulation, these fine particles continue to accumulate, causing the mud performance to deteriorate. Ultimately, a large amount of dilution or replacement of fresh mud is still required, and the generation of waste mud cannot be completely avoided. Summary of the Invention
[0005] In view of the shortcomings of the prior art, one of the purposes of the present invention is to provide a control device for adding pile foundation wall slurry, which saves space and improves slurry performance.
[0006] The above-mentioned application objectives of the present invention are achieved through the following technical solutions:
[0007] A control device for adding mud to pile foundation wall protection includes a drill bit assembly, a mud pump and a mud pool, and also includes a sedimentation assembly. The sedimentation assembly includes a sedimentation pool and a mud separation assembly. The mud separation assembly includes a screening assembly and a cyclone assembly. The screening assembly separates the mud and slurry water for the first time, and the cyclone assembly separates the mud and slurry water again. The cyclone assembly is connected to the sedimentation pool.
[0008] As a further embodiment of the control device for adding slurry to pile foundation wall disclosed in the present invention, the screening assembly includes
[0009] The bracket serves as a supporting member for the entire screening assembly;
[0010] The upper end of the hopper is the feeding port, and the lower end is the discharging port;
[0011] A rotating screen is provided at the discharge port of the hopper, the rotating screen is rotatably mounted on the bracket, and a plurality of sieve holes are opened on the rotating screen;
[0012] The diversion pipe is installed below the rotating screen, and a diversion hole is opened on the diversion pipe.
[0013] As a further embodiment of the control device for adding slurry to pile foundation wall protection disclosed in the present invention, the rotating screen and the diversion pipe are both arranged at an angle.
[0014] As a further embodiment of the control device for adding slurry to pile foundation wall protection disclosed in the present invention, the diversion hole is located at the lower end of the diversion pipe.
[0015] As a further embodiment of the control device for adding pile foundation wall slurry disclosed in the present invention, a transmission belt is arranged below the diversion pipe, and the transmission belt is also arranged at an angle. The lower end of the transmission belt is located below the lower end of the rotating screen, and a receiving hopper is placed directly below the upper end of the transmission belt.
[0016] As a further embodiment of a control device for adding slurry to pile foundation wall protection disclosed in the present invention, the cyclone assembly includes a main pipe, a branch pipe, a multi-group diverter group and a sand discharge plate. One end of the main pipe is connected to the screening assembly, the main pipe is connected to a group of the diverter groups, the outlet of the slurry of the diverter group is connected to the branch pipe, the branch pipe is connected to the next group of diverter groups, and the sand discharge plate is located below the diverter group.
[0017] As a further embodiment of a control device for adding slurry to pile foundation wall protection disclosed in the present invention, each group of the diverter group includes multiple diverters, and the diverter includes a tank body, a tank feed port is opened on the side wall of the tank body, an upper narrow port is opened at the upper end of the tank body, and a sand discharge port is opened at the bottom of the tank body, and the upper narrow port is connected to the branch pipe.
[0018] As a further embodiment of a control device for adding slurry to pile foundation wall protection disclosed in the present invention, the tank body includes a columnar portion and a conical portion, the tank feed port is opened on the side wall of the columnar portion, the upper narrow opening is opened at the upper end of the columnar portion, and the sand discharge port is arranged at the lower end of the conical portion.
[0019] As a further embodiment of the control device for adding pile foundation wall slurry disclosed in the present invention, the surface of the sand discharge tray is tilted, the sand discharge tray has a structure that is larger at the top and smaller at the bottom, and a sand discharge pipe is connected to the small end of the sand discharge tray.
[0020] In summary, the present invention includes at least one of the following beneficial technical effects:
[0021] 1. By using rotary screening to remove coarse slag and cyclone to remove fine sand, the traditional model of relying on large sedimentation tanks is replaced, which greatly reduces the volume and number of sedimentation tanks and significantly alleviates the construction space pressure of narrow sites;
[0022] 2. The two-stage separation of rotating screening to remove coarse residue and cyclone to remove fine sand greatly reduces the risk of mud performance deterioration due to solid phase accumulation, reduces or even avoids the number of times fresh mud is replaced, and significantly reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the overall structure of a control device for adding slurry to pile foundation wall protection disclosed in the present invention;
[0024] Figure 2 This is a schematic structural diagram of a sediment sedimentation component of a control device for adding slurry to a pile foundation wall disclosed in the present invention;
[0025] Figure 3 This is a structural schematic diagram of a screening assembly of a control device for adding slurry to a pile foundation wall disclosed in the present invention;
[0026] Figure 4 This is a schematic diagram of the structure of a swirl assembly of a control device for adding slurry to pile foundation wall disclosed in the present invention.
[0027] Figure 5 This is a structural diagram of a diverter for a control device for adding slurry to pile foundation wall disclosed in the present invention.
[0028] In the figure,
[0029] 1. Drill bit assembly; 11. Drill bit; 12. Drill rod; 13. Drill bit rotation device; 14. Faucet;
[0030] 2. Mud pump; 3. Mud pool;
[0031] 4. Sedimentation assembly; 41. Sedimentation tank; 42. Mud separation assembly;
[0032] 43. Screening assembly; 431. Bracket; 432. Drop hopper; 4321. Hopper inlet; 4322. Discharge port; 433. Rotating screen; 4331. Screening holes; 434. Diverter pipe; 4341. Diverter hole; 435. Drive belt; 436. Receiver;
[0033] 44. Cyclone assembly; 441. Main flow pipe; 442. Diverter group; 4420. Diverter; 4421. Tank body; 4422. Tank feed port; 4423. Upper pass; 4424. Sand discharge port; 4425. Column; 4426. Cone; 443. Sand discharge tray; 4431. Sand discharge pipe; 444. Branch pipe. DETAILED DESCRIPTION
[0034] The present invention will be further described in detail below with reference to the accompanying drawings.
[0035] Reference Figure 1 , which is a control device for adding pile foundation wall slurry disclosed in the present invention, including a drill bit 11 component 1, a mud pump 2, a mud pool 3 and a sediment sedimentation component 4.
[0036] The drill bit assembly 11 includes a drill bit 11 placed in the pile foundation hole. The upper end of the drill bit 11 is connected to a drill rod 12 and a drill bit 11 rotation device. The drill rod 12 is connected to a faucet 14. The faucet 14 is connected to the outlet of the mud pump 2 through a high-pressure hose. The inlet of the mud pump 2 is connected to the mud pool 3 through a slurry suction pipe, forming a mud circulation loop.
[0037] Regarding the sedimentation component 4, it includes a sedimentation tank 41 and a mud separation component 42. The sedimentation tank 41 and the mud tank 3 are both concrete or geomembrane lined tanks dug on the ground. The mud separation component 42 includes a screening component 43 and a cyclone component 44. The screening component 43 is responsible for the preliminary solid-liquid separation of the mud and drilling cuttings mixture returned from the pile hole, and screens out large particles of drill cuttings; the cyclone component 44 performs efficient cyclone centrifugal separation on the fine sand-containing slurry after screening, and further removes the fine sand. Through the series action of the screening component 43 and the cyclone component 44, the separation and purification function of the sedimentation tank 41 is shared and strengthened, thereby significantly reducing the necessary number and volume of the sedimentation tank 41 and reducing the construction area. At the same time, after two rounds of physical screening and purification, the solid phase content in the mud is greatly reduced. The present invention greatly reduces the risk of mud performance deterioration due to solid phase accumulation, reduces or even avoids the number of times fresh mud is replaced, and greatly reduces construction costs.
[0038] The screening assembly 43 includes a bracket 431, which serves as the supporting structure of the entire screening assembly 43. The bracket 431 can be welded from steel sections to provide sufficient rigidity and stability. A hopper 432 is fixedly connected to the bracket 431. The upper end of the hopper 432 is a hopper feed port 4321, and the lower end is a discharge port 4322. The hopper 432 is larger at one end of the hopper feed port 4321 than at the other end of the discharge port 4322, forming a conical or square-conical structure with a larger top and a smaller bottom, facilitating the centralized drop of materials. A rotating screen 433 is mounted at the discharge port 4322 of the hopper 432. The rotating screen 433 is rotatably mounted on the bracket 431 via a bearing or bushing. Rotating screen 433 is typically a cylindrical screen or belt screen structure, with a plurality of sub-screen holes 4331 formed on the screen. The aperture of sub-screen holes 4331 can be selected based on geological conditions and the type of drill bit 11, typically within the range of 5-20 mm, to remove most drill cuttings and gravel. A diverter pipe 434 is installed below rotating screen 433, with diverter holes 4341 formed in it. The drill cuttings mixture enters the hopper 432 through the hopper inlet 4321, flows by gravity to the outlet 4322, and falls into rotating screen 433. The rotating screen 433 is driven by a motor and rotates at a certain speed, so that the slurry and fine sand smaller than the sieve holes 4331 fall through the sieve holes, while large particles of drill cuttings and impurities are blocked by the screen and thrown along the screen surface or diverted to the outside of the screen. The separated slurry falls into the diversion pipe 434 below and flows to the cyclone component 44 through the diversion hole 4341.
[0039] As a specific embodiment of the present invention, both the rotating screen 433 and the diverter pipe 434 are tilted. The axis of the rotating screen 433 is tilted at a certain angle to the horizontal plane, allowing the removed large drill cuttings to automatically slide down and be discharged toward the lower end under the action of gravity and centrifugal force. The diverter pipe 434 is also tilted, its tilt angle matching that of the rotating screen 433. Diverter holes 4341 are provided on the wall or bottom of the diverter pipe 434 near its lower end, ensuring smooth flow of slurry to the cyclone assembly 44. A transmission belt 435 is disposed below the diverter pipe 434. The transmission belt 435 is also tilted, with its tilt angle slightly greater than the repose angle of the drill cuttings to ensure reliable transportation. The lower end of the transmission belt 435 is located below the lower end of the rotating screen 433 and is used to receive and transport the coarse drill cuttings discharged from the lower end of the rotating screen 433. A hopper 436 is located directly below the upper end of the transmission belt 435 to collect and transport the coarse drill cuttings.
[0040] The swirl assembly 44 includes a main flow pipe 441, a plurality of groups of diverters 4420 and 442, and a sand discharge disc 443. One end of the main flow pipe 441 is connected to the diversion hole 4341 of the diversion pipe 434, usually connected by a flange or a quick connector. The main flow pipe 441 connects the slurry containing fine sand after screening by the screening assembly 43 to the first group of diverters 4420 and 442 at a certain pressure and flow rate. Each group of diverters 4420 and 442 includes multiple parallel diverters 4420, and the number of parallel diverters 4420 depends on the processing flow requirement. The diverter 4420 includes a tank body 4421, a tangential tank material port 4422 is opened on the side wall of the tank body 4421, an overflow upper bottleneck 4423 is opened at the upper end of the tank body 4421, and a sand discharge port 4424 is opened at the bottom of the tank body 4421. Tank body 4421 comprises an upper cylindrical portion 4425 and a lower conical portion 4426. A feed port 4422 is located on the sidewall of the column 4425, and an upper conical opening 4423 is located at the center of the upper end of the column 4425. This opening is connected to a branch pipe 444, which collects the overflow from all diverters 4420 in the group and connects it to the feed port 4422 of the next group 442 of diverters 4420 or to the sedimentation tank 41. A sand discharge port 4424 is located at the center of the lower end of the conical portion 4426 and points toward the sand discharge tray 443. The sand discharge tray 443 is tilted, forming an inverted cone or V-shaped groove structure with a larger upper portion and a smaller lower portion, which facilitates the collection of bottom sand and directs it to the center. The smaller end of the sand discharge tray 443 is connected to a sand discharge pipe 4431.
[0041] When the fine sand-containing slurry flows into the diverter 4420, the slurry mixture enters the diverter 4420 tangentially at a certain pressure. The pressure of the slurry mixture can be provided by a pump or formed by a high head difference. The slurry mixture enters the column portion 4425 to form a high-speed rotating flow field. The high-density sand particles in the slurry mixture are thrown toward the wall under the action of a strong centrifugal force. At the same time, they are affected by the downward axial component of force and spiral downward along the wall. After reaching the cone section, they are further concentrated and finally discharged from the sand discharge port 4424 at the bottom as a high-concentration slurry to the sand discharge tray 443. The low-density slurry and extremely fine particles move toward the central axis, forming an upward-moving inner vortex at the center of the axis. They are then discharged from the upper vent 4423 as a relatively clean overflow slurry, thereby achieving efficient solid-liquid two-phase separation.
[0042] It should be understood that the size of the diverter 4420 group 442 can be reduced in sequence along the flow direction of the slurry. This size reduction design is to match the gradually decreasing flow rate and separation accuracy requirements. Figure 4 In the illustrated embodiment, two groups 442 of diverters 4420 are provided. The diverters 4420 located in the front group 4420 along the slurry flow direction are larger, specifically 150-300 mm in diameter, with a large processing capacity, primarily removing coarse sand particles. The diverters 4420 located in the rear group 4420 are smaller, specifically 50-100 mm in diameter, with a reduced processing capacity but higher separation accuracy, used to remove finer sand particles and achieve deep purification.
[0043] A branch pipe 444, connected to the upper conduit 4423 of the final diverter group 4420 along the slurry flow direction, leads to the sedimentation tank 41. After two stages of cyclonic separation, the overflow slurry, with its sand content extremely low, enters the sedimentation tank 41 primarily for final static clarification and precipitation of trace ultrafine particles. The clean slurry treated in the sedimentation tank 41 can be re-sucked back into the pile hole by the slurry pump 2 for recycling.
[0044] The implementation principle of this embodiment is as follows: the mud pump 2 injects the wall protection mud into the bottom of the pile hole, and the return slurry carrying the drilling cuttings is collected into the inclined rotating screen 433 through the drop hopper 432. The large particles of drilling cuttings are intercepted and automatically discharged by the transmission belt 435. The slurry containing fine sand under the screen enters the multi-stage diverter 4420, and centrifugal classification is achieved through the rotating flow field. The fine sand is discharged through the bottom flow port, and the purified slurry enters the sedimentation tank 41 through the overflow port for standing, and is finally pumped back to the borehole by the mud pump 2 for recycling.
[0045] By using a rotating screen 433 to remove coarse slag and a cyclone to remove fine sand, the traditional model of relying on large sedimentation tanks 41 is replaced, which greatly reduces the volume and number of sedimentation tanks 41, significantly alleviates the construction space pressure in narrow sites, and greatly reduces the risk of mud performance deterioration due to solid phase accumulation. The number of times fresh mud is replaced is reduced or even avoided, which greatly reduces construction costs.
[0046] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.
Claims
1. A control device for adding mud to a pile foundation wall, comprising a drill bit (11) assembly (1), a mud pump (2) and a mud pool (3), characterized in that: it also includes a sedimentation assembly (4), the sedimentation assembly (4) includes a sedimentation pool (41) and a mud separation assembly (42), the mud separation assembly (42) includes a screening assembly (43) and a cyclone assembly (44), the screening assembly (43) performs a first separation of mud and slurry, the cyclone assembly (44) separates mud and slurry again, and the cyclone assembly (44) is connected to the sedimentation pool (41).
2. The control device for adding slurry to pile foundation wall according to claim 1, characterized in that: The screening assembly (43) includes A bracket (431) serving as a supporting member for the entire screening assembly (43); A hopper (432) having a feed opening (4321) at its upper end and a discharge opening (4322) at its lower end; A rotating screen (433) is provided at the discharge port (4322) of the hopper (432). The rotating screen (433) is rotatably mounted on the bracket (431). The rotating screen (433) is provided with a plurality of sub-screen holes (4331). The diversion pipe (434) is installed below the rotating screen (433), and a diversion hole (4341) is opened on the diversion pipe (434).
3. The control device for adding slurry to pile foundation wall according to claim 2, characterized in that: The rotating screen (433) and the diversion pipe (434) are both arranged in an inclined manner.
4. The control device for adding slurry to pile foundation wall according to claim 3, characterized in that: The diversion hole (4341) is located at the lower end of the diversion tube (434).
5. The control device for adding slurry to pile foundation wall according to claim 3, characterized in that: A transmission belt (435) is provided below the diversion pipe (434). The transmission belt (435) is also inclined. The lower end of the transmission belt (435) is located below the lower end of the rotating screen (433). A receiving hopper (436) is placed directly below the upper end of the transmission belt (435).
6. The control device for adding slurry to pile foundation wall according to claim 1, characterized in that: The cyclone assembly (44) comprises a main flow pipe (441), a branch flow pipe (444), a multi-group diverter (4420) group (442) and a sand removal disc (443). One end of the main flow pipe (441) is connected to the screening assembly (43). The main flow pipe (441) is connected to a group of diverter (4420) groups (442). The outlet of the slurry of the diverter (4420) group (442) is connected to the branch flow pipe (444). The branch flow pipe (444) is connected to the next group of diverter (4420) group (442). The sand removal disc (443) is located below the diverter (4420) group (442).
7. The control device for adding slurry to pile foundation wall according to claim 6, characterized in that: Each group (442) of the diverters (4420) includes a plurality of diverters (4420), and the diverters (4420) include a tank body (4421), a tank feed port (4422) is provided on the side wall of the tank body (4421), an upper narrow opening (4423) is provided on the upper end of the tank body (4421), a sand discharge port (4424) is provided at the bottom of the tank body (4421), and the upper narrow opening (4423) is connected to the branch pipe (444).
8. The control device for adding slurry to pile foundation wall according to claim 7, characterized in that: The tank body (4421) includes a columnar portion (4425) and a conical portion (4426), the tank feed port (4422) is opened on the side wall of the columnar portion (4425), the upper opening (4423) is opened at the upper end of the columnar portion (4425), and the sand discharge port (4424) is arranged at the lower end of the conical portion (4426).
9. The control device for adding slurry to pile foundation wall according to claim 8, characterized in that: The disk surface of the sand discharge disk (443) is arranged tilted, and the sand discharge disk (443) has a structure that is larger at the top and smaller at the bottom. The small end of the sand discharge disk (443) is connected to a sand discharge pipe (4431).