Cement-soil mixing pile environment-friendly construction device based on foundation liquefied soil
The cement-soil mixing pile device is used to spray cement powder into the liquefied soil of the foundation and mix it with the soil to form cement-soil piles, which solves the problems of limited depth of foundation liquefaction treatment and environmental pollution, and realizes fast, low-cost and environmentally friendly foundation treatment.
Patent Information
- Application Number
- CN202422317464.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Existing foundation liquefaction treatment methods have problems such as limited construction depth, high cost, serious environmental pollution, and high construction noise. They are particularly difficult to effectively treat in areas prone to collapsible loess and medium sandy soil.
A cement-soil mixing pile device based on foundation liquefied soil is used. The drilling rig screw is used to spray cement powder and mix it with the foundation soil to form a cement-soil pile. The angle detection mechanism is used to ensure construction quality, reduce material consumption, and minimize environmental impact.
It achieves deep liquefaction treatment, shortens the construction period, reduces costs, and minimizes environmental damage. The construction quality is controllable, large-scale excavation and replacement are avoided, the noise is low, and it meets the requirements of green construction.
Smart Images
Figure CN223481823U_ABST
Abstract
Description
Technical Field
[0001] The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil in the foundation belongs to the field of foundation construction technology. Background Technology
[0002] The foundation is the load-bearing carrier of a building. Construction projects increasingly face complex geological conditions and poor foundations. Currently, the engineering field's technology for foundation treatment is still immature, especially in areas with high liquefaction coefficients, severely collapsible loess soils, and medium sandy soils. Commonly used methods for treating liquefied foundations include replacement, dynamic compaction, vibratory driven gravel piles, and vibro-compacted stone piles.
[0003] Dynamic compaction involves using lifting equipment to raise a hammer to a certain height and then allowing it to fall freely. This impact energy acts on the foundation soil, generating significant shock waves and dynamic stresses. This increases the strength and density of the foundation soil, reduces its compressibility, and eliminates liquefaction. However, dynamic compaction generally affects a depth of no more than 10 meters, requires substantial vibration energy, and has strict requirements on the surrounding environment. Furthermore, its effectiveness is significantly influenced by the groundwater level.
[0004] The vibratory driven gravel pile method involves using a pile driver to hammer, vibrate, or statically drive a pipe into the ground to form a hole. Material is then poured into the pipe, and the pipe is vibrated and lifted simultaneously to form a dense gravel pile body, while simultaneously compacting the soil between the piles and eliminating liquefaction of sand and silt. However, its disadvantages include the inability to penetrate thick layers of sand or silt when the required treatment layer is thick. It can only eliminate liquefaction in the upper soil layer, leaving the lower layer untreated. This limits the treatment area and depth due to geological conditions. Furthermore, the method requires filling the pipe with gravel material during construction, resulting in higher liquefaction treatment costs.
[0005] The main equipment for vibro-compaction crushed stone pile method is a specially designed vibro-compactor. Its front end can spray high-pressure water, causing the sand near the nozzle to liquefy rapidly. The vibro-compactor, using its own weight and vibration, sinks into the sand layer, displacing and compacting the floating sand during sinking. Once the vibro-compactor reaches the designed depth, the lower nozzle is closed and the upper nozzle is opened, simultaneously backfilling the hole with crushed stone. The vibro-compactor is then gradually raised, compacting the backfill material and surrounding sand layer, and forcing the crushed stone into the pile hole, forming a large-diameter, compacted crushed stone pile while simultaneously eliminating the liquefaction of the surrounding soil. Its disadvantages include: high water and electricity consumption, large quantities of crushed stone used for liquefaction treatment, environmental unfriendliness, and the risk of hole collapse and burying the vibro-compactor; additionally, due to the large amount of water used, the site becomes muddy, requiring a 1m layer of crushed stone to ensure the working surface remains dry, resulting in low construction efficiency and high liquefaction treatment costs. Utility Model Content
[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide an environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil in the foundation. Under the premise of good liquefaction treatment effect, it can carry out deep liquefaction treatment without filling sand and gravel materials. At the same time, it is a liquefaction treatment method with low construction noise, low cost and environmental protection, avoiding problems such as large-area excavation and backfilling of foundation pits, and can properly solve the problem of foundation liquefaction.
[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: the environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation includes a drilling screw, a drilling support, a powder feeding device and a powder feeding hose. The drilling screw is raised and lowered on the drilling support. The drilling support is provided with a drilling drive mechanism that drives the drilling screw to rotate. The drilling screw has a hollow structure. The lower end of the drilling screw is provided with a powder injection hole. The powder feeding device is connected to the upper end of the drilling screw through the powder feeding hose.
[0008] An angle detection mechanism for detecting the tilt angle of the drill screw is installed on the drill rig support, and a solenoid valve is installed on the powder feeding hose. The angle detection mechanism and the solenoid valve are connected to the controller.
[0009] Preferably, the angle detection mechanism includes a detection slider, a detection seat, a displacement sensor, and an angle sensor. The detection slider is horizontally slidably mounted on the drilling rig support. A first return spring is provided between the drilling rig support and the detection slider. One end of the detection seat is rotatably connected to the detection slider, and the other end of the detection seat is connected to the drilling rig screw. A second return spring is provided between the detection slider and the detection seat. The displacement sensor is mounted on the drilling rig support and is used to detect the displacement distance of the detection slider. The angle sensor is mounted between the detection slider and the detection seat and is used to measure the swing angle of the detection seat.
[0010] Preferably, the detection seat includes a detection rod and a detection ring. One end of the detection rod is rotatably connected to a detection slider, and the other end of the detection rod is fixedly connected to the detection ring, which is sleeved on the outside of the drilling rig screw.
[0011] Preferably, the detection ring is threaded with a first positioning bolt and a second positioning bolt, the included angle between the first positioning bolt and the second positioning bolt is 90°, and the inner ends of the first positioning bolt and the second positioning bolt are pressed against the drilling rig screw.
[0012] Preferably, the powder feeding device includes a cement powder silo, a high-pressure tank, and an air compressor. The cement powder silo is connected to the high-pressure tank through a cement conveying unit, the air outlet of the air compressor is connected to the high-pressure tank, and the inlet of the powder feeding hose is connected to the high-pressure tank.
[0013] Preferably, the high-pressure tank is equipped with a stirring mechanism.
[0014] Preferably, the drilling rig drive mechanism includes a drive motor, a drive gear set, and a lifting mechanism. The drive motor is connected to the drilling rig screw through the drive gear set. The drilling rig screw is provided with a long key or spline that is slidably connected to the drive gear set. The lifting mechanism is connected to the upper end of the drilling rig screw. A screw guide mechanism is also provided between the drilling rig bracket and the drilling rig screw.
[0015] Preferably, the lifting mechanism includes a lifting wire rope and a winch. A fixed pulley is provided at the upper end of the drilling rig support. The drilling rig screw and the winch are respectively located on both sides of the drilling rig support. One end of the lifting wire rope is connected to the winch, and the other end of the lifting wire rope passes around the fixed pulley and is connected to the drilling rig screw.
[0016] Preferably, the screw guide mechanism includes two semi-circular guide clamps, one side of which is rotatably connected to the drilling rig bracket, and the other side of the two guide clamps is connected by bolts or pins.
[0017] Preferably, the inner side of the guide clamp is provided with a plastic bushing.
[0018] Compared with existing technologies, the beneficial effects of the above-mentioned technical solution for the environmentally friendly construction device of cement-soil mixing piles based on liquefiable soil foundation are as follows:
[0019] 1. Fast construction speed and short cycle. After the drilling rig screw descends to a certain height, dry cement powder is sprayed out through the powder injection hole of the drilling rig screw to form a high-speed jet stream that impacts, cuts, and breaks up the soil. The drilling rig screw forcibly mixes the cement and other materials with the foundation soil to form cement-soil piles. Through rigorous calculations and comprehensive consideration of the overall process, the complex construction is simplified, enabling the treatment of liquefied soil layers in a short time without the need for earthwork excavation, layered compaction and backfilling, etc., significantly shortening the construction period for liquefied soil treatment.
[0020] 2. The drilling rig support is equipped with an angle detection mechanism to detect the tilt angle of the drilling rig screw. A solenoid valve is installed on the powder delivery hose. When the tilt angle of the drilling rig screw exceeds a set angle, a closing pulse signal is sent to the solenoid valve, and a stop pulse signal is sent to the drilling rig drive mechanism. This ensures that the verticality of the pile is within the allowable error range, making the construction process quantifiable and controllable in terms of quality. This method uses specialized machinery for construction. Compared with other solutions, this method allows for quantifiable quality detection, eliminates the quality risks associated with rough construction, and ensures controllable construction quality.
[0021] 3. Energy-saving and environmentally friendly. This process does not require earthwork excavation or the transfer of sand and gravel resources for backfilling, resulting in low environmental damage and conforming to the concepts of green construction and energy conservation and environmental protection.
[0022] 4. Cost savings. This process only requires cement as a construction material, and the amount needed is significantly reduced compared to the graded sand and gravel replacement method, which can greatly reduce construction costs. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation.
[0024] Figure 2 This is a schematic diagram of an angle detection mechanism.
[0025] Figure 3 A three-dimensional view of the guide clamp.
[0026] The components include: 1. Base; 2. Drilling rig bracket; 3. Drilling rig screw; 4. Screw guide mechanism; 5. Angle detection mechanism; 6. Drive motor; 7. Drive gear set; 8. Powder feeding hose; 9. Lifting wire rope; 10. Fixed pulley; 11. Winch; 12. Cement powder silo; 13. Air compressor; 14. High pressure tank; 15. Screw feeder; 16. Solenoid valve; 17. Long key 401; Guide clamp 402; Plastic bushing 501; Detection slider 502; Detection rod 503; Detection ring 504; First positioning bolt 505; Second positioning bolt 506; Contact block 507; First return spring 508; Second return spring 509; Displacement sensor 510; Angle sensor. Detailed Implementation
[0027] Figures 1-3 This is the best embodiment of the environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation. The following is in conjunction with the attached... Figures 1-3 The present invention will be further described below.
[0028] Reference Figure 1 This environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundations includes a drilling screw 3, a drilling support 2, a powder delivery device, and a powder delivery hose 8. The drilling support 2 is fixed to one side of the base 1. The drilling screw 3 is raised and lowered on the drilling support 2. The drilling support 2 is equipped with a drilling drive mechanism that drives the drilling screw 3 to rotate. The drilling screw 3 is a hollow structure with a powder injection hole at its lower end. The powder delivery device is connected to the upper end of the drilling screw 3 through the powder delivery hose 8. After the drilling drive mechanism drives the drilling screw 3 to a certain height, dry cement powder is sprayed out through the powder injection hole of the drilling screw 3 to form a high-speed jet stream that impacts, cuts, and breaks up the soil. The drilling screw 3 forcibly mixes the cement and other materials with the foundation soil to form cement-soil piles. Through rigorous calculations and comprehensive consideration of the overall process, the complex construction is simplified, enabling the treatment of liquefiable soil layers in a short time, reducing the delays caused by earthwork excavation, layered compaction, and backfilling, and significantly shortening the construction period.
[0029] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.
[0030] The drilling rig drive mechanism includes a drive motor 6, a drive gear set 7, and a lifting mechanism. The drive motor 6 is connected to the drilling rig screw 3 via the drive gear set 7. The drilling rig screw 3 is provided with a long key 17 that slides on the end gear of the drive gear set 7. The lifting mechanism is connected to the upper end of the drilling rig screw 3. A screw guide mechanism 4 is also provided between the drilling rig support 2 and the drilling rig screw 3. The drilling rig support 2 is provided with a support plate that supports the drive gear set 7.
[0031] The lifting mechanism includes a lifting wire rope 9 and a winch 11. A fixed pulley 10 is provided at the upper end of the drilling rig support 2. The drilling rig screw 3 and the winch 11 are respectively located on both sides of the drilling rig support 2. One end of the lifting wire rope 9 is connected to the winch 11, and the other end of the lifting wire rope 9 passes around the fixed pulley 10 and is connected to the drilling rig screw 3.
[0032] The powder feeding device in this embodiment includes a cement powder silo 12, a high-pressure tank 14, and an air compressor 13. The cement powder silo 12 is connected to the high-pressure tank 14 via a cement conveying unit, the air outlet of the air compressor 13 is connected to the high-pressure tank 14, and the inlet of the powder feeding hose 8 is connected to the high-pressure tank 14. A stirring mechanism (not shown in the figure) is provided inside the high-pressure tank 14. The cement conveying unit is preferably a screw feeder 15, which feeds the cement powder in the cement powder silo 12 into the high-pressure tank 14. At the same time, the screw feeder 15 can achieve sealing to prevent high-pressure air in the high-pressure tank 14 from entering the cement powder silo 12, ensuring that the high-pressure air generated by the air compressor 13 feeds the cement powder in the high-pressure tank 14 into the drilling screw 3 through the powder feeding hose 8.
[0033] An angle detection mechanism 5 for detecting the tilt angle of the drill screw 3 is installed on the drill rig support 2, and a solenoid valve 16 is installed on the powder delivery hose 8. The angle detection mechanism 5 and the solenoid valve 16 are connected to a controller, and a switch connected to the controller is also installed on the drill rig drive mechanism. When the angle detection mechanism 5 detects that the tilt angle of the drill screw 3 is greater than the set angle, it sends a closing pulse signal to the solenoid valve 16 and a stop pulse signal to the drill rig drive mechanism, ensuring that the verticality of the pile is within the allowable error value, and the quality of the construction process is quantitatively controllable. This method uses specialized machinery for construction. Compared with other solutions, this solution can quantitatively detect the construction quality, eliminate the quality hazards caused by rough construction, and ensure that the construction quality is controllable.
[0034] For details, see Figure 2The angle detection mechanism 5 includes a detection slider 501, a detection seat, a displacement sensor 509, and an angle sensor 510. The detection slider 501 is horizontally slidably mounted on the drill rig support 2. A first return spring 507 is provided between the drill rig support 2 and the detection slider 501. One end of the detection seat is rotatably connected to the detection slider 501, and the other end of the detection seat is connected to the drill screw 3. A second return spring 508 is provided between the detection slider 501 and the detection seat. The displacement sensor 509 is mounted on the drill rig support 2 and is used to detect the displacement distance of the detection slider 501. The angle sensor 510 is mounted between the detection slider 501 and the detection seat and is used to measure the swing angle of the detection seat.
[0035] The detection seat includes a detection rod 502 and a detection ring 503. One end of the detection rod 502 is rotatably connected to a detection slider 501, and the other end of the detection rod 502 is fixedly connected to the detection ring 503. The detection ring 503 is sleeved on the outside of the drilling rig screw 3. A first positioning bolt 504 and a second positioning bolt 505 are threaded onto the detection ring 503. The included angle between the first positioning bolt 504 and the second positioning bolt 505 is 90°. The inner ends of the first positioning bolt 504 and the second positioning bolt 505 are pressed against the drilling rig screw 3 to ensure that the relative position of the detection ring 503 and the detection rod 502 is fixed and to accommodate drilling rig screws 3 of different sizes.
[0036] The inner ends of the first positioning bolt 504 and the second positioning bolt 505 are provided with contact blocks 506 that contact the drilling screw 3. In this embodiment, the second return spring 508 is a torsion spring.
[0037] See Figure 3 The screw guide mechanism 4 includes two semi-circular guide clamps 401. One side of the guide clamp 401 is rotatably connected to the drilling rig bracket 2, and the other side of the two guide clamps 401 is connected by bolts or pins. A plastic bushing 402 is provided on the inner side of the guide clamp 401 to reduce wear.
[0038] Work process:
[0039] 1) Based on the cement-soil mixing pile positioning drawings provided by the design unit, use RTK and other equipment to perform positioning and layout.
[0040] 2) Locate the piles according to the construction area and sequence. Before constructing the mixing piles, the site should be leveled and underground obstacles cleared. Then, the piles should be aligned and the borehole elevation measured. Drilling begins. The drive motor 6 drives the drilling screw 3 to rotate through the drive gear. At the same time, the winch 11 releases the rope, and the lifting wire rope 9 lowers the drilling screw 3. The drilling screw 3 should be drilled slowly at low pressure on the ground. After drilling to about 1.0m below the ground, normal drilling begins. The sinking speed of the drilling screw 3 should not exceed 1.0m / min.
[0041] 3) The cement in the cement powder silo 12 is fed into the high pressure tank 14 through the screw feeder 15. The stirring mechanism in the high pressure tank 14 is started, and at the same time the drill screw 3 rotates in the forward direction, drilling and sinking at a uniform speed until the design elevation is reached.
[0042] 4) When the drill screw 3 sinks to the designed depth, turn on the air compressor 13. When the air-powder mixture reaches the powder injection hole, the winch 11 pulls the drill screw 3 upward at a determined lifting speed. At the same time, the motor drives the drill screw 3 to rotate in the opposite direction through the drive gear set 7, drilling and spraying ash while simultaneously lifting the drill screw 3. The lifting speed of the drill screw 3 should not exceed 0.5 m / min, and the lifting or sinking amount of the drill screw 3 per revolution should be 10-15 mm. The maximum powder feeding pressure for dry construction should not be less than 0.5 MPa.
[0043] 5) The pile formation adopts a four-mixing and two-spraying process. When the drill screw 3 is reversed and raised to 50cm above the design elevation, the air compressor 13 is turned off. In order to ensure that the soft soil and the solidifying agent are mixed evenly, the drill screw 3 is drilled down again until the design depth is reached, and then the drill screw 3 is reversed and raised out of the ground at the specified speed.
[0044] 6) The drilling rig support 2 and base 1 are moved to prepare for driving the next pile. During the relocation process, care should be taken to protect the finished product.
[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.
Claims
1. An environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundations, characterized in that: The system includes a drilling screw (3), a drilling support (2), a powder feeding device, and a powder feeding hose (8). The drilling screw (3) is mounted on the drilling support (2). The drilling support (2) is equipped with a drilling drive mechanism that drives the drilling screw (3) to rotate. The drilling screw (3) is a hollow structure. The lower end of the drilling screw (3) is equipped with a powder injection hole. The powder feeding device is connected to the upper end of the drilling screw (3) through the powder feeding hose (8). An angle detection mechanism (5) for detecting the tilt angle of the drilling screw (3) is provided on the drilling support (2). A solenoid valve (16) is provided on the powder feeding hose (8). The angle detection mechanism (5) and the solenoid valve (16) are connected to a controller.
2. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 1, characterized in that: The angle detection mechanism (5) includes a detection slider (501), a detection seat, a displacement sensor (509), and an angle sensor (510). The detection slider (501) is horizontally slidably mounted on the drill support (2). A first return spring (507) is provided between the drill support (2) and the detection slider (501). One end of the detection seat is rotatably connected to the detection slider (501), and the other end of the detection seat is connected to the drill screw (3). A second return spring (508) is provided between the detection slider (501) and the detection seat. The displacement sensor (509) is mounted on the drill support (2) and is used to detect the displacement distance of the detection slider (501). The angle sensor (510) is mounted between the detection slider (501) and the detection seat and is used to measure the swing angle of the detection seat.
3. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 2, characterized in that: The detection seat includes a detection rod (502) and a detection ring (503). One end of the detection rod (502) is rotatably connected to the detection slider (501), and the other end of the detection rod (502) is fixedly connected to the detection ring (503). The detection ring (503) is sleeved on the outside of the drilling rig screw (3).
4. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 3, characterized in that: The detection ring (503) is threaded with a first positioning bolt (504) and a second positioning bolt (505). The angle between the first positioning bolt (504) and the second positioning bolt (505) is 90°. The inner ends of the first positioning bolt (504) and the second positioning bolt (505) are pressed against the drilling rig screw (3).
5. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 1, characterized in that: The powder feeding device includes a cement powder silo (12), a high-pressure tank (14) and an air compressor (13). The cement powder silo (12) is connected to the high-pressure tank (14) through a cement conveying unit. The air outlet of the air compressor (13) is connected to the high-pressure tank (14). The inlet of the powder feeding hose (8) is connected to the high-pressure tank (14).
6. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 5, characterized in that: The high-pressure tank (14) is equipped with a stirring mechanism.
7. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 1, characterized in that: The drilling rig drive mechanism includes a drive motor (6), a drive gear set (7), and a lifting mechanism. The drive motor (6) is connected to the drilling rig screw (3) through the drive gear set (7). The drilling rig screw (3) is provided with a long key (17) or spline that is slidably connected to the drive gear set (7). The lifting mechanism is connected to the upper end of the drilling rig screw (3). A screw guide mechanism (4) is also provided between the drilling rig bracket (2) and the drilling rig screw (3).
8. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 7, characterized in that: The lifting mechanism includes a lifting wire rope (9) and a winch (11). The upper end of the drilling rig support (2) is provided with a fixed pulley (10). The drilling rig screw (3) and the winch (11) are respectively set on both sides of the drilling rig support (2). One end of the lifting wire rope (9) is connected to the winch (11), and the other end of the lifting wire rope (9) passes around the fixed pulley (10) and is connected to the drilling rig screw (3).
9. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 7, characterized in that: The screw guide mechanism (4) includes two semi-circular guide clamps (401), one side of which is rotatably connected to the drilling rig bracket (2), and the other side of the two guide clamps (401) is connected by bolts or pins.
10. The environmentally friendly construction device for cement-soil mixing piles based on liquefiable soil foundation as described in claim 9, characterized in that: The guide clamp (401) has a plastic bushing (402) on its inner side.