A pile extraction device and method for sandy soil

Abstract

This invention discloses a sandy soil pile extraction device, comprising a sleeve disposed outside a pile driver, and an oscillating drive assembly for driving the pile driver to loosen is disposed outside the sleeve; an upper support assembly is connected between the upper end of the inner side of the sleeve and the pile driver; a water tank is connected to the lower end of the inner side of the sleeve, and an integral pile extraction drive assembly is connected to the upper end of the water tank; a scraper assembly is connected to the lower end of the water tank; the water tank is connected to the scraper assembly. A pile extraction method using the aforementioned sandy soil pile extraction device includes the following steps: S1, collecting typical soil samples from the area, performing particle analysis to determine the range of clay content in the soil, and obtaining the water output from the water tank; S2, starting the device and performing the pile extraction operation. The purpose of this invention is to overcome the existing defects and provide a sandy soil pile extraction device and method, greatly improving extraction efficiency and stability.

Description

Technical Field

[0001] This invention relates to a pile extraction device and method for sandy soil. Background Technology

[0002] The Mohr-Coulomb criterion states that cohesion (c) and the angle of internal friction (φ) are important indicators affecting the shear strength of soil, and are controlled by the content of fine particles in the soil. Furthermore, soils can be classified according to the size of the fine particle content, such as cohesive soils and sandy soils. In the process of pile driving in civil engineering, a pile driver is often needed to drive the pile to a certain depth to achieve the required bearing capacity. During the extraction process, the pile driver comes into contact with the shear surface of the soil, and the soil inevitably exerts lateral elastic resistance on the pile.

[0003] In cohesive soils, due to their strong cohesion and elastic resistance, existing methods often utilize clamping mechanisms to hold the sidewalls of the pile driver in place. Then, a lifting mechanism works in conjunction with the clamping mechanism to vertically lift the pile driver upwards. However, this equipment requires a large working surface, and the large contact area between the pile driver and the soil generates significant resistance, hindering rapid pile extraction. Using the same method to extract pile drivers in sandy soils further reduces extraction efficiency.

[0004] Therefore, a pile extraction device and method for sandy soil are proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the existing defects and provide a sandy soil pile extraction device and method, which greatly improves extraction efficiency and stability.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sandy soil pile extraction device, comprising a sleeve, the sleeve being disposed on the outside of a pile driver, and a swing drive assembly for driving the pile driver to loosen being disposed on the outside of the sleeve; an upper support assembly being connected between the upper end of the inner side of the sleeve and the pile driver; a water tank being connected to the lower end of the inner side of the sleeve, and an integral pile extraction drive assembly being connected to the upper end of the water tank; a scraper assembly being connected to the lower end of the water tank; and the water tank being connected to the scraper assembly.

[0007] Preferably, the swing drive assembly includes four hydraulic jacks, which are located at four positions on the outer wall of the sleeve. Each hydraulic jack is movably connected to a telescopic rod, and the upper end of each telescopic rod is connected to a rotating motor through a first connecting rod. All four rotating motors are connected to a support ring, and the support ring is fixedly connected to the upper end of the outer wall of the sleeve. The lower end of the telescopic sleeve is connected to an elastic connecting rod, and the other end of the elastic connecting rod is connected to the outer wall of the sleeve.

[0008] Preferably, it also includes four vibration motors, which are respectively connected to the four positions at the lower end of the outer wall of the sleeve, and each vibration motor is connected to a hydraulic jack through a second connecting rod.

[0009] Preferably, the integral pile extraction drive assembly includes a lifting cylinder, the lower end of which is connected to the water tank, and the telescopic end of which is connected to a transverse support rod. One end of the transverse support rod is connected to the inner wall of the sleeve, and the other end is connected to the outer wall of the pile driver.

[0010] Preferably, the scraper assembly includes an arc-shaped scraper blade, and a spring is provided between the back of the arc-shaped scraper blade and the inner wall of the sleeve, and the arc-shaped scraper blade contacts the outer wall of the pile driver through the spring.

[0011] Preferably, the upper support assembly includes a telescopic rod, one end of which is connected to a magnetic plate that is attracted to the outer wall of the pile driver, and the other end of which is rotatably connected to a gear that meshes with a toothed plate that is connected to the inner wall of the sleeve.

[0012] Preferably, the inner wall of the sleeve and the outer wall of the pile driver are provided with sliding grooves, and the two ends of the transverse support rod are slidably connected in the sliding grooves.

[0013] A method for extracting piles using the aforementioned sandy soil pile extraction equipment includes the following steps: S1. Collect typical soil samples from the area, perform particle analysis, determine the range of clay content in the soil, and obtain the water output of the water tank. S2, Start the equipment and perform pile extraction operation.

[0014] S1 involves collecting typical soil samples from the area, performing particle analysis to determine the range of clay content in the soil, and calculating the water output from the tank, including: S11. A ring cutter with a diameter of 61.8 mm and a height of 20 mm was used to collect typical sandy soil samples from the target area. Comprehensive particle analysis was performed on the soil samples, and particle analysis curves were plotted to complete the qualitative analysis of the soil and clarify the range of clay content. S12. Tests are conducted based on whether the soil sample contains particles larger than 2mm: soil samples without particles larger than 2mm are subjected to variable head permeability test and direct shear test, while soil samples containing particles larger than 2mm are subjected to constant head permeability test and triaxial compression test; the direct shear test and triaxial compression test both use axial stresses of 100kPa, 200kPa, 300kPa, and 400kPa, and the triaxial compression test uses the unconsolidated undrained test method; S13. Based on the three core parameters of the soil sample—clay content, permeability coefficient, and shear strength—a nonlinear three-dimensional fitting was performed using the Levenberg-Marquardt algorithm to obtain the peak curve; the water output of the water tank was adjusted based on the fitting results.

[0015] S2, starting the equipment and performing the pile extraction operation includes: S21, the water tank releases water to the softened soil outside the pile driver through the arc-shaped scraper; the rotating motor is started, and the rotation of the rotating motor drives the telescopic sleeve to swing through the first connecting rod. The swing of the telescopic sleeve then generates a small-amplitude directional displacement through the elastic connecting rod. Under the synergistic action of the vibrating motor, the sleeve is finally moved. The entire transmission process only generates a small-amplitude directional displacement. The swing of the sleeve causes the pile driver inside to swing, creating a gap with the outer soil. S22, At the same time, the output end of the lifting cylinder extends to drive the horizontal support rod to move upward, and the upward movement of the horizontal support rod pushes the pile driver to move upward. At the same time, the output end of the hydraulic jack extends to drive the sleeve to move upward, completing the upward pile pulling operation.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: This sandy soil pile extraction equipment and method includes an oscillating drive assembly on the outer side of the sleeve for driving the pile driver to loosen; an upper support assembly connects the upper end of the inner side of the sleeve to the pile driver; a water tank is connected to the lower end of the inner side of the sleeve, and an integrated pile extraction drive assembly is connected to the upper end of the water tank; a scraper assembly is connected to the lower end of the water tank. This allows for the control of the pile driver, and under the action of an external rotating motor and a vibrating motor, the pile driver reciprocates, greatly reducing its contact with the soil shear surface. The external lifting system of the sleeve initially lifts the pile driver, and combined with the internal lifting device, it reciprocates upwards. This device is small in size, compact in structure, and flexible in movement, adaptable to different work locations. It integrates clamping, oscillation, and lifting functions, operates stably, has a reliable structure, is easy to operate, and is highly practical. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is an isometric view of the sandy soil pile extraction device of the present invention; Figure 2 This is a cross-sectional view of the sandy soil pile extraction device of the present invention; Figure 3 This is a schematic diagram of the pile extraction method of the sandy soil pile extraction device of the present invention.

[0018] In the diagram: 1. Sleeve; 2. Pile driver; 3. Water tank; 4. Hydraulic jack; 5. Telescopic sleeve; 6. First connecting rod; 7. Rotary motor; 8. Support ring; 9. Vibration motor; 10. Second connecting rod; 11. Lifting cylinder; 12. Lateral support rod; 13. Arc-shaped scraper; 14. Spring; 15. Telescopic rod; 16. Magnetic plate; 17. Gear; 18. Toothed plate; 19. Elastic connecting rod. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-2 As shown, a sandy soil pile extraction device includes a sleeve 1, which is disposed on the outside of a pile driver 2. A swing drive assembly for driving the pile driver 2 to loosen is disposed on the outside of the sleeve 1. An upper support assembly is connected between the upper end of the inner side of the sleeve 1 and the pile driver 2. A water tank 3 is connected to the lower end of the inner side of the sleeve 1. An integral pile extraction drive assembly is connected to the upper end of the water tank 3. A scraper assembly is connected to the lower end of the water tank 3. The water tank 3 is connected to the scraper assembly.

[0021] Specifically, the swing drive assembly includes four hydraulic jacks 4, which are located at four positions on the outer wall of the sleeve 1. Each hydraulic jack 4 is movably connected to a telescopic sleeve rod 5. The upper end of each telescopic sleeve rod 5 is connected to a rotary motor 7 through a first connecting rod 6. All four rotary motors 7 are connected to a support ring 8, which is fixedly connected to the upper end of the outer wall of the sleeve 1. The lower end of the telescopic sleeve rod 5 is connected to an elastic connecting rod 19, and the other end of the elastic connecting rod 19 is connected to the outer wall of the sleeve 1.

[0022] Specifically, it also includes four vibration motors 9, which are respectively connected to the four positions at the lower end of the outer wall of the sleeve 1. Each vibration motor 9 is connected to a hydraulic jack 4 through a second connecting rod 10.

[0023] Specifically, the bottom of the hydraulic jack 4 is horizontal to the ground, and the telescopic sleeve 5 is fitted over the hydraulic jack. When the telescopic sleeve 5 is subjected to force, it moves downwards, while the hydraulic jack 4 provides upward support. The rotating motor 7 moves on the support ring 8, and its movement drives the first connecting rod 6, which is connected to the telescopic sleeve 5. The rotation of the telescopic sleeve 5 drives the elastic connecting rod 19 to rotate, which in turn drives the sleeve 1 to rotate. Only a small directional displacement exists here.

[0024] Specifically, the overall pile extraction drive assembly includes a lifting cylinder 11, the lower end of which is connected to the water tank 3. The telescopic end of the lifting cylinder 11 is connected to a transverse support rod 12. One end of the transverse support rod 12 is connected to the inner wall of the sleeve 1, and the other end is connected to the outer wall of the pile driver 2. Both the inner wall of the sleeve 1 and the outer wall of the pile driver 2 are provided with sliding grooves, and both ends of the transverse support rod 12 are slidably connected in the sliding grooves.

[0025] Specifically, the scraper assembly includes an arc-shaped scraper blade 13. A spring 14 is installed between the back of the arc-shaped scraper blade 13 and the inner wall of the sleeve 1. The arc-shaped scraper blade 13 contacts the outer wall of the pile driver 2 through the spring 14. The arc-shaped scraper blade 13 can effectively scrape away the soil attached to the pile driver 2. A water pipe is installed inside the arc-shaped scraper blade 13, connecting to the water outlet of the water tank 3, making its surface smooth for clamping and positioning by the clamping device. Furthermore, the water output from the water tank is determined experimentally; the infiltrated free water softens the soil.

[0026] Specifically, under the action of the lifting cylinder 11, the pile driver 2 moves upward, and the arc-shaped scraper 13 can effectively scrape off the soil attached to the pile driver 2. The arc-shaped scraper 13 is equipped with a water pipe connected to the water tank 3 to make its surface smooth so that the clamping device can clamp and position it. On the other hand, the water output of the water tank is obtained by experiment, and the infiltrated free water can soften the soil.

[0027] Specifically, the upper support assembly includes a telescopic rod 15, one end of which is connected to a magnetic plate 16. The magnetic plate 16 is attached to the outer wall of the pile driver 2. The other end of the telescopic rod 15 is rotatably connected to a gear 17. The gear 17 is meshed with a toothed plate 18, which is connected to the inner wall of the sleeve 1. This achieves initial clamping and stabilization of the pile driver 2.

[0028] Specifically, water tank 3 releases water to soften the soil outside the pile driver 2 through arc-shaped scraper 13; the rotating motor 7 is started, and the rotation of the rotating motor 7 drives the telescopic sleeve 5 to swing through the first connecting rod 6. The swing of the telescopic sleeve 5 then generates a small-amplitude turning displacement through the elastic connecting rod 19. Under the synergistic action of the vibration motor 9, the sleeve 1 is finally moved. The entire transmission process only generates a small-amplitude turning displacement. The swing of the sleeve 1 causes the pile driver 2 inside to swing, creating a gap with the outer soil; at the same time, the output end of the lifting cylinder 11 extends and drives the horizontal support rod 12 to move upward. The upward movement of the horizontal support rod 12 pushes the pile driver 2 upward. At the same time, the output end of the hydraulic jack 4 extends and drives the sleeve 1 to move upward, completing the upward pile pulling operation.

[0029] Specifically, the piling device is driven to swing back and forth by the combination of the swing drive component and the overall pile extraction drive component. This expands the gap between the piling device and the soil shear surface, effectively reducing the elastic resistance of the soil and the friction between the soil and the piling device, thus greatly improving the extraction efficiency. At the same time, the piling device usually carries residual soil during its upward movement. When the lower clamping equipment contacts its side wall, the residual soil on the side wall can be scraped off by spring adjustment, improving the cleaning efficiency of the piling device.

[0030] like Figure 3 As shown, a pile extraction method for a sandy soil pile extraction device includes the following steps: S1. Collect typical soil samples from the area, perform particle analysis, determine the range of clay content in the soil, and obtain the water output of water tank 3. S1. Collect typical soil samples from the area, perform particle analysis to determine the range of clay content in the soil, and calculate the water output of water tank 3, including: S11. Using a ring cutter with a diameter of 61.8 mm and a height of 20 mm, typical sandy soil samples were collected from the target area. Comprehensive particle size analysis was performed on the soil samples, and particle size analysis curves were plotted to complete the qualitative analysis of the soil and determine the range of clay content. The particle size distribution should include: 0.002-0.005 mm, 0.005 mm-0.02 mm, 0.02-0.05 mm, 0.05-0.075 mm, 0.075 mm-0.1 mm, 0.1-0.25 mm, 0.25-0.5 mm, 0.5-1 mm, 1-2 mm, 2-5 mm, 5-10 mm, 10-20 mm, and >20 mm.

[0031] S12. Tests are conducted based on whether the soil sample contains particles larger than 2mm: soil samples without particles larger than 2mm are subjected to variable head permeability test and direct shear test, while soil samples containing particles larger than 2mm are subjected to constant head permeability test and triaxial compression test; the direct shear test and triaxial compression test both use axial stresses of 100kPa, 200kPa, 300kPa, and 400kPa, and the triaxial compression test uses the unconsolidated undrained test method; S13. Based on the three core parameters of the soil sample—clay content, permeability coefficient, and shear strength—a nonlinear three-dimensional fitting using the Levenberg-Marquardt algorithm was performed to obtain a peak curve. The water output of the water tank was adjusted based on this fitting result. The adjustment method based on the Levenberg-Marquardt algorithm fitting result is as follows: the soil is classified according to the clay content in the soil sample. While ensuring that the sequence of other particle groups remains almost unchanged, the clay content is adjusted to prepare different samples. The peak point obtained from the Levenberg-Marquardt algorithm fitting is selected, and the water content at the peak point (i.e., the optimal soil strength) is measured to obtain the water output of the water tank.

[0032] S2, Start the equipment and perform pile extraction operation.

[0033] S2, Start the equipment and perform the pile extraction operation, including: S21, water tank 3 releases water to soften the soil outside the pile driver 2 through arc-shaped scraper 13; start rotating motor 7, rotating motor 7 drives telescopic sleeve 5 to swing through first connecting rod 6, telescopic sleeve 5 swings and then generates a small-amplitude turning displacement through elastic connecting rod 19, under the synergistic action of vibrating motor 9, finally drives sleeve 1 to move. The entire transmission process only generates a small-amplitude turning displacement. The displacement and swing of sleeve 1 drives the internal pile driver 2 to swing, creating a gap with the outer soil. S22, At the same time, the output end of the lifting cylinder 11 extends and drives the horizontal support rod 12 to move upward. The upward movement of the horizontal support rod 12 pushes the pile driver 2 to move upward. At the same time, the output end of the hydraulic jack 4 extends and drives the sleeve 1 to move upward, completing the upward pile pulling operation.

[0034] This sandy soil pile extraction equipment and method includes a swing drive assembly on the outer side of the sleeve 1 to loosen the pile driver 2; an upper support assembly connecting the upper inner end of the sleeve 1 to the pile driver 2; a water tank 3 connected to the lower inner end of the sleeve 1, with an integrated pile extraction drive assembly connected to the upper end of the water tank 3; and a scraper assembly connected to the lower end of the water tank 3. This allows for the control of the pile driver, and under the action of an external rotating motor and a vibrating motor, the pile driver reciprocates, greatly reducing its contact with the soil shear surface. An external lifting system initially lifts the pile driver, and combined with an internal lifting device, it reciprocates upwards. This device is small in size, compact in structure, and flexible in movement, adaptable to different work locations. It integrates clamping, swinging, and lifting functions, operates stably, has a reliable structure, is easy to operate, and is highly practical.

[0035] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pile extraction device for sandy soil, characterized in that, The device includes a sleeve (1) disposed on the outside of a pile driver (2), and a swing drive assembly for driving the pile driver (2) to loosen is disposed on the outside of the sleeve (1); an upper support assembly is connected between the upper inner end of the sleeve (1) and the pile driver (2); a water tank (3) is connected to the lower inner end of the sleeve (1), and an integral pile extraction drive assembly is connected to the upper end of the water tank (3); a scraper assembly is connected to the lower end of the water tank (3); and the water tank (3) is connected to the scraper assembly. The swing drive assembly includes four hydraulic jacks (4), which are located at four positions on the outer wall of the sleeve (1). Each hydraulic jack (4) is movably connected to a telescopic sleeve rod (5), and the upper end of each telescopic sleeve rod (5) is connected to a rotating motor (7) through a first connecting rod (6). All four rotating motors (7) are connected to a support ring (8), which is fixedly connected to the upper end of the outer wall of the sleeve (1). The lower end of the telescopic sleeve (5) is connected to the elastic connecting rod (19), and the other end of the elastic connecting rod (19) is connected to the outer wall of the sleeve (1). It also includes four vibration motors (9), which are respectively connected to the four positions at the lower end of the outer wall of the sleeve (1). Each vibration motor (9) is connected to a hydraulic jack (4) through a second connecting rod (10). The overall pile extraction drive assembly includes a lifting cylinder (11), the lower end of which is connected to the water tank (3), and the telescopic end of which is connected to a transverse support rod (12). One end of the transverse support rod (12) is connected to the inner wall of the sleeve (1), and the other end is connected to the outer wall of the pile driver (2). The scraper assembly includes an arc-shaped scraper (13), and a spring (14) is provided between the back of the arc-shaped scraper (13) and the inner wall of the sleeve (1). The arc-shaped scraper (13) contacts the outer wall of the pile driver (2) through the spring (14). The upper support assembly includes a telescopic rod (15), one end of which is connected to a magnet plate (16), the magnet plate (16) is attached to the outer wall of the pile driver (2), and the other end of the telescopic rod (15) is rotatably connected to a gear (17), the gear (17) is meshed with a toothed plate (18), and the toothed plate (18) is connected to the inner wall of the sleeve (1). The inner wall of the sleeve (1) and the outer wall of the pile driver (2) are both provided with sliding grooves, and the two ends of the transverse support rod (12) are slidably connected in the sliding grooves.

2. A method for extracting piles using a sandy soil pile extraction device as described in claim 1, characterized in that, Includes the following steps: S1, collect typical soil samples in the area, perform particle analysis, determine the range of clay content in the soil, and obtain the water output of the water tank (3); S2, Start the equipment and perform pile extraction operation; S2, starting the equipment and performing the pile extraction operation includes: S21, the water tank (3) releases water to the softened soil outside the pile driver (2) through the arc-shaped scraper (13); the rotating motor (7) is started, and the rotating motor (7) rotates through the first connecting rod (6) to drive the telescopic sleeve (5) to swing. The telescopic sleeve (5) swings and then generates a small-amplitude turning displacement through the elastic connecting rod (19). Under the synergistic effect of the vibration motor (9), the sleeve (1) is finally driven to move. The entire transmission process only generates a small-amplitude turning displacement. The displacement swing of the sleeve (1) drives the internal pile driver (2) to swing, creating a gap with the outer soil. S22, At the same time, the output end of the lifting cylinder (11) extends and drives the horizontal support rod (12) to move upward. The horizontal support rod (12) moves upward and pushes the pile driver (2) to move upward. At the same time, the output end of the hydraulic jack (4) extends and drives the sleeve (1) to move upward, thus completing the upward pile pulling operation.

3. The pile extraction method of the sandy soil pile extraction equipment according to claim 2, characterized in that, S1 collects typical soil samples from the area, performs particle analysis, determines the range of clay content in the soil, and calculates the water output of tank (3), which includes: S11. A ring cutter with a diameter of 61.8 mm and a height of 20 mm was used to collect typical sandy soil samples from the target area. Comprehensive particle analysis was performed on the soil samples, and particle analysis curves were plotted to complete the qualitative analysis of the soil and clarify the range of clay content. S12. Tests are conducted based on whether the soil sample contains particles larger than 2mm: soil samples without particles larger than 2mm are subjected to variable head permeability test and direct shear test, while soil samples containing particles larger than 2mm are subjected to constant head permeability test and triaxial compression test; the direct shear test and triaxial compression test both use axial stresses of 100kPa, 200kPa, 300kPa, and 400kPa, and the triaxial compression test uses the unconsolidated undrained test method; S13. Based on the three core parameters of the soil sample—clay content, permeability coefficient, and shear strength—a nonlinear three-dimensional fitting was performed using the Levenberg-Marquardt algorithm to obtain the peak curve; the water output of the water tank was adjusted based on the fitting results.

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