Pile forming device for jetting cement powder into stratum through water jet cutting

Abstract

The utility model discloses a pile forming device for jetting cement powder into a water jet cutting stratum, and belongs to the technical field of foundation reinforcement construction methods and used machine tool equipment. High-pressure water supplies water to a jetting machine tool, a cement powder jetting system supplies powder to the jetting machine tool, and the powder is jetted out from a nozzle through a concentric pipe. And meanwhile, cement dry powder sprayed into the outer layer is mixed with disturbed stratum soil, in the process that the winch and the gyrator continuously lift and rotate the concentric pipe, a cement-soil pile is formed from bottom to top, the formed pile body is large in diameter, high in cement content and uniform in cement distribution, and the integrity and strength of the pile are effectively improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of foundation reinforcement construction methods and equipment, and specifically relates to a pile-forming device for water jet cutting of the stratum and injection of cement powder. Background Technology

[0002] In the process of reinforcing strata with adverse geological conditions, it is necessary to form cement-soil piles, which are composed of a mixture of stratum soil and cement that has solidified within the strata. Existing methods, including high-pressure jet grouting and cement mixing piles, are mature technologies, but they also have varying degrees of shortcomings in terms of pile diameter, pile strength, and adaptability to different strata. To overcome the deficiencies of these methods and combine their strengths, a new method for forming cement-soil piles by water jetting to cut through the strata and injecting cement powder has been developed, along with the pile-forming equipment used. Utility Model Content

[0003] The purpose of this invention is to provide a pile-forming device that uses high-pressure water jets to cut disturbed soil layers and simultaneously injects dry cement powder, which is then mixed with the disturbed soil to form a cement-soil pile.

[0004] The technical solution adopted is:

[0005] A pile-forming device for cutting through strata with water jetting and injecting cement powder includes a high-pressure water system, a cement powder injection system, injection tools, and a work trolley.

[0006] The high-pressure water system includes a water tank, a shut-off valve, and a high-pressure water pump.

[0007] The sprayed cement powder system includes a powder feeding section and a powder spraying section.

[0008] The powder feeding section includes a hopper, a hopper valve, a powder extractor, and a storage tank.

[0009] The powder spraying section includes an air compressor, air delivery valves, and an air storage tank.

[0010] The spraying equipment includes a water hose, a powder hose, a rotary confluencer, a concentric tube, and a nozzle.

[0011] The work trolley includes a body, tower, pulley block, support rod, winch, wire rope and slewing device.

[0012] The outlet pipe of the water tank is connected to the inlet of the high-pressure water pump, and the outlet of the water tank is equipped with a shut-off valve.

[0013] The outlet pipe of the hopper is connected to the inlet of the powder extractor, and the outlet of the hopper is equipped with a hopper valve.

[0014] The outlet pipe of the powder extractor is connected to the powder inlet of the storage tank.

[0015] The air compressor's outlet pipe is connected to the inlet of the air receiver tank, and the air receiver tank's outlet pipe is connected to the air inlet of the storage tank.

[0016] The outlet of the gas storage tank is equipped with a gas delivery valve.

[0017] The outlet of the high-pressure water pump is connected to the water inlet of the rotary confluencer via a water delivery hose.

[0018] The outlet of the storage tank is connected to the powder inlet of the rotary confluencer via a powder conveying hose.

[0019] The outlet of the rotary confluencer is connected to the inlet of the concentric tube, and the outlet of the concentric tube is connected to the nozzle.

[0020] The work trolley consists of a body, pulley block, support rod, and wire rope.

[0021] The vehicle body is equipped with a tower, a slewing device, and a winch.

[0022] The outer wall of the concentric tube is provided with symmetrical flat strip slide rails, and the inside of the rotary device is provided with symmetrical grooves. The concentric tube passes through the rotary device, and the flat strip slide rails of the concentric tube correspond to the grooves inside the rotary device.

[0023] The tower is connected to a support rod extending diagonally downwards. The upper end of the winch's wire rope passes over the shaft on the support rod, then passes over the pulley on the side of the top pulley block of the tower, and then passes over the pulley on the other side of the top pulley block of the tower, connecting to the lifting ring of the rotating confluence.

[0024] The principle of the new construction method is to use high-pressure water jets to cut and disturb the soil strata, while simultaneously injecting dry cement powder to mix with the disturbed soil strata, forming cement-soil piles. To achieve this result, machinery and corresponding equipment, pipelines, and work trolleys capable of generating high-pressure water jets and injecting dry cement powder were designed, constituting an implementation device and pile formation process for water jet cutting of strata and injection of cement powder.

[0025] A water jetting and cement powder injection pile-forming device consists of four parts: a high-pressure water system, a cement powder injection system, an injection tool, and a work trolley. During operation, an engineering drilling rig first drills a hole at the designed pile location at a predetermined depth and diameter. Then, the work trolley moves to the drilling location, and a winch on the trolley lowers the injection tool to the predetermined depth in the hole. The high-pressure water system and the cement powder injection system are activated. The resulting high-pressure water and cement powder flow through a rotating confluencer at the top of the injection tool into a central concentric tube, and then are ejected from the bottom nozzle in a coaxial water-powder jetting pattern. This creates a jet of high-pressure water inside, surrounded by cement powder, cutting, mixing, and disrupting the strata. Simultaneously, the cement powder fills and mixes into the disturbed soil. As the injection tool continuously rises from bottom to top at a certain speed, a cylindrical cement-soil pile is formed in the strata. The diameter of the pile is controlled by the pressure and flow rate of the injected high-pressure water, the pressure and flow rate of the cement powder, and the rotation and lifting speed of the nozzle.

[0026] Its advantages are:

[0027] This invention provides a new process and pile-forming device for soft soil foundation reinforcement. The feature is the use of coaxial jetting, which allows high-pressure water jets and cement powder jets to cut through the strata along the same trajectory. Where the water jets disturb the soil, cement powder is mixed with the soil, resulting in piles with large diameters, high cement content, and uniform distribution, effectively improving the integrity and strength of the piles. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] 1. Tower; 2. Pulley block; 3. Support rod; 4. Winch; 5. Hydraulic system; 6. Outriggers; 7. Distribution cabinet; 8. Oil tank; 9. Wire rope; 10. Lifting ring; 11. Rotary confluencer; 12. Concentric tube; 13. Rotary head; 14. Wheel; 15. Nozzle; 16. Cutting and mixing zone; 17. Cement-soil pile; 18. Water hose; 19. Powder hose; 20. Water tank; 21. Shut-off valve; 22. High-pressure water pump; 23. Material pressure gauge; 24. Air pressure gauge; 25. Hopper valve; 26. Cement powder; 27. Feed hopper; 28. Powder extractor; 29. ​​Storage tank pressure relief port filter; 30. Tower base; 31. Control console; 32. Storage tank; 33. Air compressor; 34. Air valve; 35. Air tank; 36. Storage tank air port filter. Detailed implementation method:

[0030] A pile-forming device for cutting through strata with water jetting and injecting cement powder includes a high-pressure water system, a cement powder injection system, injection tools, and a work trolley.

[0031] The high-pressure water system includes a water tank 20, a shut-off valve 21, and a high-pressure water pump 22.

[0032] The sprayed cement powder system includes a powder feeding section and a powder spraying section.

[0033] The powder feeding section includes a hopper 27, a hopper valve 25, cement powder 26, a powder pump 28, a powder pressure gauge 23, and a storage tank 32.

[0034] The powder spraying section includes an air compressor 33, an air delivery valve 34, an air tank 35, and an air pressure gauge 24.

[0035] The spraying equipment includes a control console 31, a water supply hose 18, a powder supply hose 19, a rotary confluencer 11, a concentric tube 12, and a nozzle 15.

[0036] The work trolley includes a body, tower 1, pulley block 2, support rod 3, winch 4, hydraulic system 5, outriggers 6, electrical control cabinet 7, oil tank 8, wire rope 9, lifting ring 10, slewing device 13, and wheels 14.

[0037] The outlet pipe of water tank 20 is connected to the inlet of high pressure water pump 22, and the outlet of water tank 20 is equipped with a shut-off valve 21.

[0038] The outlet pipe of hopper 27 is connected to the inlet of powder extractor 28, and a hopper valve 25 is provided at the outlet of hopper 27. Cement powder 26 is contained in hopper 27.

[0039] The outlet pipe of the powder extractor 28 is connected to the powder inlet of the storage tank 32, and the powder inlet of the storage tank 32 is equipped with a powder pressure gauge 23.

[0040] The outlet pipe of the air compressor 33 is connected to the inlet of the air tank 35, and the outlet pipe of the air tank 35 is connected to the air inlet of the storage tank 32. The air inlet of the storage tank 32 is equipped with an air pressure gauge 24.

[0041] The outlet of the gas storage tank 35 is equipped with a gas delivery valve 34.

[0042] The outlet of the high-pressure water pump 22 is connected to the water inlet of the rotary confluence 11 via a water delivery hose 18.

[0043] The outlet of the storage tank 32 is connected to the powder inlet of the rotary confluencer 11 via the powder conveying hose 19.

[0044] Water delivery hose 18 and powder delivery hose 19 pass through control console 31. Water pressure sensor, water flow sensor, powder pressure sensor and powder flow sensor in control console 31 can detect whether the pressure and flow values ​​in water delivery hose 18 and powder delivery hose 19 meet the requirements, and control high-pressure water pump 22, powder pump 28 and air compressor 33 to cooperate to meet the requirements.

[0045] The outlet of the rotary confluencer 11 is connected to the inlet of the concentric tube 12, and the outlet of the concentric tube 12 is connected to the nozzle 15.

[0046] The vehicle body is equipped with a slewing device 13, a tower 1, a winch 4, an oil tank 8, a hydraulic system 5, and a power distribution cabinet 7.

[0047] The concentric tube 12 is lowered into the symmetrical groove of the rotary device 13 and fixed through the symmetrical flat strip slide rail on it, and passes through the rotary device 13.

[0048] Tower 1 is supported on the vehicle body by a strut 3 that extends diagonally downwards.

[0049] The upper end of the wire rope 9 of the winch 4 passes over the shaft in the middle of the support rod 3, then passes over the pulley on the side of the pulley block 2 at the top of the tower 1, then passes over the pulley on the other side of the pulley block 2 at the top of the tower 1, and connects to the lifting ring 10 of the rotary confluencer 11. This lifts and lowers the rotary confluencer 11 and the concentric tube 12 connected to it. The slide rail on the concentric tube 12 moves up and down along the groove of the slewing device 13. The pulley block 2 includes two pulleys.

[0050] The bottom of the vehicle body is equipped with multiple outriggers 6 and multiple wheels 14.

[0051] Furthermore, the pressure relief port of the storage tank 32 is equipped with a pressure relief port filter screen 29.

[0052] The storage tank 32 is equipped with an air inlet filter 36.

[0053] The specific process flow is as follows:

[0054] The high-pressure water pump 22 is supplied with water from the water tank 20, and the motor of the high-pressure water pump 22 is connected to an external three-phase power supply. Opening the shut-off valve 21 of the water tank 20 starts the high-pressure water pump 22, outputting high-pressure water that passes through the control panel 31. After the pressure and flow rate are controlled by the control panel 31 to meet the requirements, the water enters the water delivery hose 18, then passes through the rotary confluencer 11 into the inner tube of the concentric tube 12, and finally sprays out from the nozzle 15. The water delivery hose 18 is a flexible hose that can move up and down with the concentric tube 12 and move back and forth with the work trolley.

[0055] When the powder spraying system is working, the hopper valve 25 is opened, and the powder pump 28 is started to pump the cement powder 26 to the storage tank 32. The air compressor 33 is turned on to pressurize the air storage tank 35, and the air delivery valve 34 is opened to deliver compressed air to the storage tank 32. The compressed air blows the cement powder 26 in the storage tank 32 to the control console 31. After the pressure and flow rate are controlled by the control console 31 to meet the requirements, the powder enters the powder delivery hose 19, then enters the outer tube of the rotary confluencer 11 and the concentric tube 12, and finally is sprayed out from the nozzle 15. The concentric tube 12 is a coaxial double tube structure with symmetrical flat strip slide rails on the outer wall.

[0056] The pressure on the powder pressure gauge 23, which transports cement powder from the powder extractor 28 to the powder storage tank 32, should be greater than the pressure on the air pressure gauge 24, which transports compressed air from the air compressor 33 to the powder storage tank 32, to ensure that the cement powder enters the powder storage tank 32. The powder storage tank 32 is equipped with a pressure relief filter 29 and an air inlet filter 36 to prevent the powder in the powder storage tank 32 from flowing back into the air supply pipeline or polluting the external environment during system depressurization.

[0057] The rotating confluencer 11 combines water jets and cement powder jets into a coaxial double-pipe flow channel, and rotates together with the concentric tube 12. The nozzle 15 coaxially ejects two media flows: a high-pressure water jet inside the nozzle 15 and an air jet carrying cement powder around it. The high-pressure water jet cuts and mixes the soil, while the air jet carrying cement powder mixes with the cut and disturbed soil to form a cutting and mixing zone 16, which solidifies to form a cement-soil pile 17.

[0058] The tower 1 is connected to the tower base 30 via a pin and supported by a support rod 3. The tower base 30 is fixed to the vehicle body. A pulley block 2 is fixed to the top of the tower 1. A steel wire rope 9 passes through the pulley block 2, with one end connected to a rotary confluencer 11 via a lifting ring 10 and the other end connected to a winch 4 via the support rod 3. The top of the support rod 3 is hinged to the tower 1, and the bottom is hinged to the winch 4, which is fixed to the vehicle body. The vehicle body also houses a hydraulic system 5, an oil tank 8, and corresponding hydraulic drive mechanisms, including the winch 4, outriggers 6, traveling wheels 14, and a slewing mechanism 13.

[0059] After the rotary head 13 fixes the concentric tube 12, the rotary head 13 is hydraulically driven to rotate the concentric tube 12 and the spraying tool connected to it; the drive wheel 14 moves forward (backward) to the hole where the stratum to be sprayed is located, and the outrigger 6 is lowered to the ground to stabilize the trolley, so as to realize the overall control of the spraying tool by the work trolley.

[0060] The winch 4 lowers the concentric tube 12, with the nozzle 15 fixed at its lower end, to a predetermined depth at the bottom of the borehole by lowering the wire rope 9. The winch 4 then pulls the wire rope 9 to slowly raise the concentric tube 12 at the designed speed, causing the nozzle 15 to rise during the spraying of the stratum. At the same time, the rotary device 13 rotates the concentric tube 12. During the continuous lifting and rotation of the concentric tube 12 and the nozzle 15, the nozzle 15 is coaxially sprayed with a high-pressure water jet and a cement powder jet carried by compressed air. The two jets are used to cut, mix, and form piles in the stratum soil.

[0061] The hydraulic system 5 drives the traveling wheels 14 forward (or backward) to bring the work trolley to the predetermined hole position. The hydraulic system 5 is activated to control the outriggers 6 to land, so that the work trolley remains stable during the lowering and lifting of the concentric tube 12.

[0062] The hydraulic system 5 also includes a motor, an oil pump, and hydraulic circuits, and the motor is powered by an external power supply provided by the distribution cabinet 7.

[0063] The rotary confluencer 11, concentric tube 12, and nozzle 15 are all coaxial double-pipe structures. The inner pipe transports high-pressure water, and the outer pipe transports compressed air and cement powder. All are sealed with threaded rubber rings. The rotary confluencer 11 is connected to the water hose 18 and the powder hose 19 with quick connectors, making the entire spraying machine easy to disassemble.

Claims

1. A pile-forming device for jetting water to cut stratum and injecting cement powder, comprising a high-pressure water system, a cement powder injection system, a jetting tool and a working trolley, characterized in that: the high-pressure water system comprises a water tank (20), a stop valve (21) and a high-pressure water pump (22); the cement powder injection system comprises a powder feeding part and a powder injection part; the powder feeding part comprises a hopper (27), a hopper valve (25), a powder extractor (28) and a storage tank (32); the powder injection part comprises an air compressor (33), a gas delivery valve (34) and a gas storage tank (35); the jetting tool comprises a water delivery hose (18), a powder delivery hose (19), a rotary flow combiner (11), a concentric pipe (12) and a nozzle (15); the working trolley comprises a trolley body, a tower (1), a pulley block (2), a support rod (3), a winch (4), a steel wire rope (9) and a swivel (13); the water outlet pipeline of the water tank (20) is connected to the water inlet of the high-pressure water pump (22), and the water outlet of the water tank (20) is provided with the stop valve (21); the outlet pipeline of the hopper (27) is connected to the inlet of the powder extractor (28), and the outlet of the hopper (27) is provided with the hopper valve (25); the outlet pipeline of the powder extractor (28) is connected to the powder inlet of the storage tank (32); the outlet pipeline of the air compressor (33) is connected to the inlet of the gas storage tank (35), and the outlet pipeline of the gas storage tank (35) is connected to the air inlet of the storage tank (32); the outlet of the gas storage tank (35) is provided with the gas delivery valve (34); the outlet of the high-pressure water pump (22) is connected to the water inlet of the rotary flow combiner (11) through the water delivery hose (18); the outlet of the storage tank (32) is connected to the powder inlet of the rotary flow combiner (11) through the powder delivery hose (19); the outlet of the rotary flow combiner (11) is connected to the inlet of the concentric pipe (12), and the outlet of the concentric pipe (12) is connected to the nozzle (15); the working trolley comprises a trolley body, a pulley block (2), a support rod (3) and a steel wire rope (9); the trolley body is provided with the tower (1), the swivel (13) and the winch (4); the outer wall of the concentric pipe (12) is provided with symmetrical flat strip-shaped sliding rails, the swivel (13) is provided with symmetrical grooves inside, the concentric pipe (12) passes through the swivel, and the flat strip-shaped sliding rails of the concentric pipe (12) correspond to the grooves inside the swivel (13) in position; the tower (1) is connected to the support rod extending downwardly, the upper end of the steel wire rope (9) of the winch (4) is wound around the shaft on the support rod (3), then around the pulley on one side of the top pulley block (2) of the tower (1), then around the pulley on the other side of the top pulley block (2) of the tower (1), and connected to the lifting ring (10) of the rotary flow combiner (11).

2. The pile-forming device according to claim 1, characterized in that: the pressure relief opening of the storage tank (32) is provided with a storage tank pressure relief opening filter screen (29) inside; and the air inlet of the storage tank (32) is provided with a storage tank air inlet filter screen (36) inside.

3. The pile-forming device according to claim 1, characterized in that: the powder inlet of the storage tank (32) is provided with a powder pressure gauge (23). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The air inlet of the storage tank (32) is provided with an air pressure gauge (24).

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