Hole washing and silt separating system for cast-in-place pile construction
By using a powerful air compressor to agitate the soil and a multi-stage mud separation system, the problem of low hole washing efficiency in cast-in-place pile construction was solved, achieving efficient mud treatment and sediment removal, thus improving the quality and efficiency of cast-in-place pile construction.
Patent Information
- Application Number
- CN202520539431.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-26
AI Technical Summary
In existing cast-in-place pile construction, the efficiency of hole washing is low, the sediment at the bottom of the hole is difficult to be effectively pumped out, and the mud and sand in the mud are not thoroughly treated, resulting in poor hole washing effect.
High-pressure compressed air is generated by an air compressor and sent to the bottom of the pile hole through an air delivery pipe for strong agitation. Combined with a mud and sand separation component and a multi-stage mud pool system, the mud is settled and separated. The mud is circulated by extraction pumps and reinjection pumps to improve the efficiency of hole washing.
It significantly improved the efficiency of pumping out mud and sediment from the bottom of the hole, reduced the mud and sand content in the circulating injection mud in the pile hole, and improved the efficiency and effect of hole washing.
Smart Images
Figure CN223824953U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of cast-in-place pile construction equipment, and in particular relates to a system for washing holes and separating mud and sand during cast-in-place pile construction. Background Technology
[0002] In the construction of cast-in-place piles, borehole washing and mud treatment are crucial steps. Borehole washing refers to cleaning the mud and sand inside the pile hole, while mud treatment refers to filtering the mud to remove the mud and sand, and then recycling the mud. Traditional borehole washing methods are positive circulation washing and reverse circulation washing: Positive circulation washing uses a water pump to pressurize the flushing fluid from the center of the drill string into the bottom of the hole and back out through the drill bit nozzle. It then returns to the borehole opening through the annular gap between the drill string and the borehole wall, and flows into the mud pool through the ground circulation tank. It does not require additional devices such as borehole seals and is suitable for various drilling methods. Reverse circulation uses flushing fluid to go down from the center of the drill string and out from the reverse nozzle, creating a negative pressure suction force in the pipe, thus forming a local reverse circulation at the bottom of the hole.
[0003] The aforementioned hole-washing methods are inefficient because they fail to adequately agitate the mud at the bottom of the pile hole, hindering the efficient removal of sediment. Furthermore, existing technologies primarily rely on sedimentation in the mud pit to remove sediment. However, the mud and sand in the mud are not sufficiently removed, resulting in mud reinjected into the pile hole still containing some sediment, further reducing the efficiency and effectiveness of hole washing. Therefore, a novel hole-washing and sediment separation system for cast-in-place pile construction is needed to address these technical problems. Utility Model Content
[0004] The purpose of this invention is to provide a system for washing and separating mud and sand during the construction of cast-in-place piles, thereby improving the efficiency and effectiveness of the washing process.
[0005] The technical solution adopted by this utility model is: a system for washing and separating mud and sand during the construction of cast-in-place piles, including a mud tank, an air compressor, and a mud and sand separation component. The mud and sand separation component separates mud and sand in the mud tank. An air supply pipe is installed on the air outlet of the air compressor, and the lower end of the air supply pipe extends to the bottom of the pile hole. The system also includes a mud pump for pumping mud from the pile hole to the mud tank. An extraction pipe is installed on its inlet, and the lower end of the extraction pipe extends to the bottom of the pile hole. The system also includes a recharge pump, with a circulation pipe installed on its inlet and connected to the mud tank, and a recharge pipe installed on its outlet. A hole opening assembly is provided at the opening of the pile hole. The hole opening assembly includes a hole opening support and a central pipe located at the center. The recharge pipe is connected to the upper end of the central pipe.
[0006] Preferably, the mud pit includes a first mud pit and a second mud pit. A mud pump draws mud into the first mud pit, and a mud-sand separation component is disposed in the second mud pit. The mud pit also includes a transfer mud pump, which draws mud from the first mud pit and transports the mud to the mud-sand separation component via a delivery pipe. The mud after mud-sand separation enters the second mud pit, and a reinjection pump draws mud from the second mud pit.
[0007] Preferably, an air distribution ring is installed at the lower end of the air supply pipe, and multiple air jet holes are provided at the top of the air distribution ring.
[0008] Preferably, the orifice bracket of the orifice assembly is a cross-shaped bracket, which is anchored to the orifice of the pile hole with anchor nails, and the central tube is located at the center of the pile hole.
[0009] Preferably, the sediment separation assembly includes a first side plate and a second side plate that are supported by a support and arranged opposite to each other. A support frame is installed between the bottom edges of the first side plate and the second side plate, a rear baffle is installed between the rear edges, and a discharge ramp is installed between the front edges. A filter screen is installed on the support frame, and the assembly also includes a vibration mechanism.
[0010] Preferably, the vibration mechanism includes a drive shaft installed between the first side plate and the second side plate, and a drive motor installed on the outside of the first side plate or the second side plate, with an eccentric rotating block installed at the other end of the drive shaft.
[0011] Preferably, a plurality of reinforcing connecting beams are installed between the first side plate and the second side plate of the sediment separation component.
[0012] The advantages and positive effects of this utility model are:
[0013] This invention provides a system for washing and separating mud and sand during the construction of cast-in-place piles. Compared with existing washing methods, this invention uses an air compressor to generate high-pressure compressed air, which is then delivered to the bottom of the pile hole via an air supply pipe. The released compressed air powerfully agitates the mud and sediment at the bottom of the pile hole. A mud pump then extracts the mud and sediment. The powerful agitation exerted by the air compressor significantly improves the efficiency of mud and sediment removal, thus significantly improving the washing efficiency and allowing the washing process to reach the required parameters for cast-in-place pile construction more quickly. Furthermore, by equipping the mud tank with a mud-sand separation component, the mud undergoes not only sedimentation but also mud-sand separation, effectively promoting the separation of mud and sand from the mud. This significantly reduces the mud and sand content of the mud circulated into the pile hole, further improving the washing efficiency and effect. Attached Figure Description
[0014] Figure 1 This is a top view of the structure of this utility model;
[0015] Figure 2 yes Figure 1 Structural schematic diagram of the central pile hole and its auxiliary components;
[0016] Figure 3 yes Figure 1 A three-dimensional structural diagram of the sediment separation component.
[0017] In the picture:
[0018] 1. First mud pit; 2. Second mud pit; 3. Air compressor; 4. Air supply pipe; 5. Pipe hole; 6. Extraction pipe; 7. Extraction mud pump; 8. Recharge pipe; 9. Recharge pump; 10. Circulation pipe; 11. Transfer mud pump; 12. Conveying pipe; 13. Sediment separation assembly; 13-1. Support; 13-2. First side plate; 13-3. Second side plate; 13-4. Reinforcing connecting beam; 13-5. Rear baffle; 13-6. Support base frame; 13-7. Drive motor; 13-8. Drive shaft; 13-9. Eccentric rotating block; 13-10. Discharge inclined plate; 14. Orifice assembly; 14-1. Orifice bracket; 14-2. Central pipe; 15. Anchor nail; 16. Air distribution ring. Detailed Implementation
[0019] To further understand the invention content, features and effects of this utility model, the following embodiments are provided in detail.
[0020] Please see Figure 1 and Figure 2 The present invention relates to a drilling and mud-sand separation system for cast-in-place piles, comprising a mud tank, an air compressor 3, and a mud-sand separation component 13. The mud tank stores mud and facilitates sedimentation. The mud-sand separation component 13 separates the mud and sand in the mud tank, resulting in a significantly reduced mud and sand content. The air compressor 3 is a screw compressor used to generate compressed air.
[0021] An air supply pipe 4 is installed at the outlet of the air compressor 3. The lower end of the air supply pipe 4 extends to the bottom of the pile hole 5. Compressed air is delivered to the bottom of the pile hole 5 through the air supply pipe 4 and then released. The released compressed air strongly agitates the mud and sediment at the bottom of the hole. In this embodiment, an air distribution ring 16 is installed at the lower end of the air supply pipe 4. Multiple air jet holes are provided at the top of the air distribution ring 16. By setting the air distribution ring 16 at the bottom of the hole, the compressed air can be discharged in a dispersed manner, which can apply a more uniform agitation effect to the bottom of the pile hole 5 and avoid the agitation position being too uniform.
[0022] It also includes a mud pump 7 for extracting mud from the pile hole 5 to a mud pit, with an extraction pipe 6 installed at its inlet and the lower end of the extraction pipe 6 extending to the bottom of the pile hole 5. For example... Figure 2As shown, the lower end of the extraction pipe 6 is located above the air distribution ring 16. The mud and sediment above the air distribution ring 16 are strongly agitated and simultaneously extracted by the mud pump 7 to the outside of the pile hole 5 and injected into the mud pool.
[0023] It also includes a reinjection pump 9, with a circulation pipe 10 installed at its inlet and connected to the mud tank, and a reinjection pipe 8 installed at its outlet. An orifice assembly 14 is provided at the orifice of the pile hole 5, including an orifice support 14-1 and a central pipe 14-2 located at the center. The reinjection pipe 8 is connected to the upper end of the central pipe 14-2. The reinjection pump 9 reinjects the mud, after sedimentation and sediment separation treatment in the mud tank, back into the pile hole 5 through the reinjection pipe 8 and the orifice assembly 14, forming a mud circulation for hole washing.
[0024] In this embodiment, the orifice bracket 14-1 of the orifice assembly 14 is a cross-shaped bracket, anchored to the orifice of the pile hole 5 with anchor nails 15, and the central tube 14-2 is located at the center of the pile hole 5. The function of the orifice assembly 14 is to inject the backfilled mud into the hole from the center of the pile hole 5, avoiding direct scouring of the inner wall of the pile hole 5 by the backfilled mud to prevent the collapse of the inner wall of the pile hole 5. Since the orifice bracket 14-1 is anchored with anchor nails 15, the position of the central tube 14-2 will not change arbitrarily during the hole washing process, and the mud will always be injected downward from the center of the pile hole 5.
[0025] The mud tank includes a first mud tank 1 and a second mud tank 2. A mud pump 7 draws mud into the first mud tank 1, and a mud-sand separation component 13 is disposed in the second mud tank 2. It also includes a transfer mud pump 11, which draws mud from the first mud tank 1 and transports it to the mud-sand separation component 13 via a delivery pipe 12. The mud after mud-sand separation enters the second mud tank 2, while the separated mud and sand are retained outside the mud tank. A reinjection pump 9 draws mud from the second mud tank 2 and reinjects it back into the mud tank.
[0026] The first mud tank 1 is used to receive and store the mud with a large amount of sediment that has been initially extracted. A large amount of sediment in the mud settles in the first mud tank 1, and the bottom of the first mud tank 1 is cleaned regularly. The second mud tank 2 is used to receive the mud after it has been separated by the mud and sand separation component 13 and to perform secondary sedimentation on this part of the mud. At this time, the mud and sand content in the mud is very low. The port of the circulation pipe 10 is set in the middle and upper layer of the second mud tank 2 to extract the upper clear liquid. The bottom of the second mud tank 2 is cleaned regularly.
[0027] Please see Figure 3 It can be seen that:
[0028] The sediment separation component 13 includes a first side plate 13-2 and a second side plate 13-3 supported by a support 13-1 and arranged opposite to each other. A support frame 13-6 is installed between the bottom edges of the first side plate 13-2 and the second side plate 13-3, a rear baffle 13-5 is installed between their rear edges, and a discharge ramp 13-10 is installed between their front edges. A filter screen (not shown in the figure) is installed on the support frame 13-6. The filter screen can be selected and replaced according to process requirements (different filter screens have different pore sizes). The transfer mud pump 11 and the conveying pipe 12 transport the mud to the rear of the sediment separation component 13 and in front of the rear baffle 13-5. In this embodiment, multiple reinforcing connecting beams 13-4 are installed between the first side plate 13-2 and the second side plate 13-3 of the sediment separation component 13. Each reinforcing connecting beam 13-4 is used to improve the overall structural strength.
[0029] The system also includes a vibration mechanism. In this embodiment, the vibration mechanism includes a drive shaft 13-8 installed between the first side plate 13-2 and the second side plate 13-3, and a drive motor 13-7 installed on the outside of either the first side plate 13-2 or the second side plate 13-3. An eccentric rotating block 13-9 is installed at the other end of the drive shaft 13-8. As shown in the figure, the vibration mechanism has two sets, front and rear. The drive motor 13-7 drives the drive shaft 13-8 to rotate, and the drive shaft 13-8 drives the eccentric rotating block 13-9 to rotate, generating a vibration effect on the bottom filter screen plate. This promotes the vibration filtration of the mud. The mud and sand are filtered and trapped above the filter screen plate and gradually move forward under the vibration, eventually being discharged by the discharge inclined plate 13-10 and falling onto the ground near the mud pool. Regular cleaning is required. Figure 1 As shown, the main body of the mud and sand separation component 13 is located above the second mud tank 2, so the filtered mud falls directly into the tank below.
[0030] Operating method:
[0031] After the cast-in-place piles are constructed, the air distribution ring 16 is thrown into the bottom of the pile hole 5. The air supply pipe 4 is connected to the air compressor 3. The hole opening assembly 14 is installed at the opening of the pile hole 5, and the return pipe 8 is connected to the central pipe 14-2. The mud pump 7, the transfer mud pump 11, and the return pump 9 are started. The compressed air generated by the air compressor 3 is delivered to the air distribution ring 16 through the air supply pipe 4. The discharged compressed air has a strong blowing effect on the mud and sediment at the bottom of the hole. The mud and sediment at this location are drawn up by the mud pump 7 and injected into the first mud pool 1. The sediment in the mud settles in a large amount in the first mud tank 1. The transfer mud pump 11 extracts the upper layer of mud in the first mud tank 1 and transports it to the mud-sand separation component 13 for mud-sand separation. After mud-sand separation, the mud is injected into the second mud tank 2 below and undergoes further sedimentation. The reinjection pump 9 extracts the upper layer of mud (with very little mud and sand content) in the second mud tank 2 through the circulation pipe 10 and transports it to the central pipe 14-2 of the borehole assembly 14 through the reinjection pipe 8. The central pipe 14-2 injects the mud into the hole from the center of the pile hole 5 downwards, realizing the mud washing circulation.
Claims
1. A system for borehole washing and sediment separation during cast-in-place pile construction, characterized in that: The system includes a mud tank, an air compressor (3), and a mud-sand separation assembly (13). The mud-sand separation assembly (13) separates the mud and sand in the mud tank. An air supply pipe (4) is installed at the air outlet of the air compressor (3), and the lower end of the air supply pipe (4) extends to the bottom of the pile hole (5). The system also includes a mud pump (7) for drawing mud from the pile hole (5) to the mud tank, and a suction pipe (6) is installed at its inlet. The lower end extends to the bottom of the pile hole (5) and also includes a recharge pump (9), with a circulation pipe (10) installed at its inlet and the circulation pipe (10) connected to the mud pit, and a recharge pipe (8) installed at its outlet. A hole assembly (14) is provided at the hole opening of the pile hole (5). The hole assembly (14) includes a hole support (14-1) and a central pipe (14-2) located at the center. The recharge pipe (8) is connected to the upper end of the central pipe (14-2).
2. The borehole washing and sediment separation system for cast-in-place pile construction as described in claim 1, characterized in that: The mud tank includes a first mud tank (1) and a second mud tank (2). A mud pump (7) draws mud into the first mud tank (1), and a mud-sand separation component (13) is arranged in the second mud tank (2). It also includes a transfer mud pump (11), which draws mud from the first mud tank (1) and transports the mud to the mud-sand separation component (13) through a conveying pipe (12). The mud after mud-sand separation enters the second mud tank (2), and a reinjection pump (9) draws mud from the second mud tank (2).
3. The system for washing and separating sediment during the construction of cast-in-place piles as described in claim 2, characterized in that: in An air distribution ring (16) is installed at the lower end of the air supply pipe (4), and multiple air jet holes are provided at the top of the air distribution ring (16).
4. The borehole washing and sediment separation system for cast-in-place pile construction as described in claim 3, characterized in that: The orifice bracket (14-1) of the orifice assembly (14) is a cross-shaped bracket, which is anchored to the orifice of the pile hole (5) by anchor nails (15), and the central tube (14-2) is located at the center of the pile hole (5).
5. The borehole washing and sediment separation system for cast-in-place pile construction as described in claim 4, characterized in that: The sediment separation component (13) includes a first side plate (13-2) and a second side plate (13-3) supported by a support (13-1) and arranged opposite to each other. A support frame (13-6) is installed between the bottom edges of the first side plate (13-2) and the second side plate (13-3), a rear baffle (15-5) is installed between the rear edges, and a discharge inclined plate (13-10) is installed between the front edges. A filter screen is installed on the support frame (13-6), and a vibration mechanism is also included.
6. The borehole washing and sediment separation system for cast-in-place pile construction as described in claim 5, characterized in that: The vibration mechanism includes a drive shaft (13-8) installed between the first side plate (13-2) and the second side plate (13-3) and a drive motor (13-7) installed on the outside of the first side plate (13-2) or the second side plate (13-3). An eccentric rotor (13-9) is installed at the other end of the drive shaft (13-8).
7. The system for washing and separating sediment during the construction of cast-in-place piles as described in claim 6, characterized in that: in Multiple reinforcing connecting beams (13-4) are installed between the first side plate (13-2) and the second side plate (13-3) of the sediment separation component (13).