Multi-point high-frequency vibration density equipment and construction method thereof

Abstract

The invention discloses multi-point high-frequency vibration densification equipment and a construction method thereof.The multi-point high-frequency vibration densification equipment comprises a mechanical arm, the tail end of the mechanical arm is fixedly connected with a high-frequency vibrator, the bottom of the high-frequency vibrator is fixedly connected with a plurality of immersed pipes, each immersed pipe is provided with a water inlet and a water outlet, and water passing holes are further formed in the immersed pipes in the axial direction of the immersed pipes; one end of the water passing hole is communicated with the water inlet, the other end of the water passing hole is communicated with the water outlet, a pile tip mechanism capable of being automatically opened and closed is arranged on the lower portion of each immersed tube, the water inlet is communicated with the outside when the pile tip mechanism is opened, and the water inlet is disconnected with the outside when the pile tip mechanism is closed. Multi-point high-frequency vibration densification equipment is used, loose liquefied sandy soil and silt can be quickly liquefied in the high-frequency vibration densification process, a large amount of water in soil is discharged, particles are rearranged and densified, instantaneous sedimentation and consolidation sedimentation are accelerated, the bearing capacity characteristic value is greatly improved, the working efficiency is improved, and the construction period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation treatment equipment, and in particular to a multi-point high-frequency vibration compaction equipment and a construction method thereof. Background Art

[0002] Soft soil foundation refers to the foundation composed of soil with low strength, high compressibility and other weak soil with bad properties. According to the characteristics of engineering geology, soft soil foundation includes foundation composed of soft soil (silt and silty soil), backfill, blown fill, miscellaneous fill and other highly compressible soil. Soft soil foundation treatment, also known as soft foundation treatment or soft soil foundation reinforcement treatment, means that before construction, if the foundation is not strong enough, in order to prevent accidents such as the foundation sinking and cracking after construction, causing instability of the building, the soft foundation needs to be treated so that its settlement becomes strong enough and the consolidation and stability of the soft foundation are improved to the design requirements.

[0003] There are several existing soft soil foundation treatment methods, such as replacement, pouring solidification materials, and dynamic compaction, with the aim of improving soil bearing capacity, reducing post-consolidation settlement settlement, and making buildings safer and more stable during use. Among them, the replacement and pouring solidification methods greatly increase the cost of foundation treatment, the construction period is long, and the efficiency is low; the dynamic compaction method has simple equipment and convenient construction, but there is groundwater under the surface of the dynamic compaction site, and measures to discharge groundwater are required during the dynamic compaction process, such as digging sump pits and drainage ditches for pumping and drainage. The sump pits are large in size, which not only takes up a lot of space, but also requires additional civil engineering costs to build and maintain, and the maintenance cost of the drainage ditch is also high. Therefore, the above-mentioned treatment methods have the disadvantages of high cost, long construction period, low efficiency, large drainage area, and high cost. Summary of the invention

[0004] In view of the above problems, the present invention provides a multi-point high-frequency vibration compaction equipment and a construction method thereof to solve the problems of high cost, long construction period, low efficiency, large drainage area and high cost brought by the existing soft soil foundation treatment methods.

[0005] The present invention is achieved in that:

[0006] A multi-point high-frequency vibration compaction device comprises a mechanical arm, the end of which is fixedly connected to a high-frequency vibrator, the bottom of which is fixedly connected to a plurality of immersed tubes, each of which is provided with a water inlet and a water outlet, the interior of the immersed tube is provided with a water through hole along its axial direction, one end of the water through hole is connected to the water inlet, and the other end is connected to the water outlet, the lower part of each immersed tube is provided with a pile tip mechanism that can be opened and closed automatically, the water inlet is connected to the outside when the pile tip mechanism is opened, and the water inlet is disconnected from the outside when the pile tip mechanism is closed.

[0007] Furthermore, the pile tip mechanism includes a first pile tip and a second pile tip, and the first pile tip and the second pile tip are relatively opened and closed and are arranged on both sides of the immersed tube. The first pile tip and the second pile tip are both provided with sliding grooves, and the immersed tube is correspondingly provided with convex columns, and the first pile tip and the second pile tip are respectively arranged on the outer side of the convex columns through the sliding grooves.

[0008] Furthermore, the slide groove is a Z-shaped structure, and the protruding column is a long columnar structure.

[0009] Furthermore, the first pile tip and the second pile tip are both U-shaped structures, and the opposite sides of the first pile tip and the second pile tip are respectively provided with abutment parts inclined outward from top to bottom, and the bottom of the abutment part forms a pointed plug, which is located below the immersed tube and has a certain distance from the bottom of the immersed tube.

[0010] Furthermore, inclined portions which are inclined inward from top to bottom are symmetrically arranged on both sides of the bottom of the immersed tube.

[0011] Furthermore, a filter chamber is provided at the lower part of the immersed tube, a filter screen is installed at the inlet end of the filter chamber, and the outlet end of the filter chamber is connected to the water hole.

[0012] The present invention also discloses a method for using a multi-point high-frequency vibration compacting device, which includes the following steps:

[0013] S1. Clean and level the construction site, measure and lay out the lines, and arrange the pile positions;

[0014] S2, the mechanical arm drives the immersed pipe to move so that the pile tip mechanism at the bottom is aligned with the pile position. At this time, the first pile tip and the second pile tip are in the open state, the water pump is connected to one end of the water pumping pipe, and the other end of the water pumping pipe is placed in the water hole;

[0015] S3, turn on the high-frequency vibrator, and the tip plugs at the bottom of the abutment parts of the first pile tip and the second pile tip are first inserted into the ground. At this time, there is a distance between the bottom of the immersed tube and the ground. As the tip plug continues to move downward, under the combined action of the upward thrust of the soil and the vertical downward exciting force of the high-frequency vibrator, the first pile tip and the second pile tip slide upward along the direction of the slide groove and rotate around the protruding column in cooperation with the slide groove and the protruding column, until the abutment parts of the first pile tip and the second pile tip are in contact, and the first pile tip and the second pile tip are in a closed state;

[0016] S4, the closed first pile tip and the second pile tip drive the immersed pipe to be inserted into the ground under the action of the high-frequency vibrator until they sink to the designed elevation of the pile bottom to form a pile hole;

[0017] S5, the mechanical arm slowly lifts the immersed tube upwards, and when the first pile tip and the second pile tip are separated from the soil below them, they slide downward along the slideway under the action of their own weight and rotate until the pile tip mechanism opens, and the groundwater in the pile hole flows into the immersed tube;

[0018] S6, turn off the high-frequency vibrator, start the water pump, and pump out the groundwater in the pile hole through the pumping pipe and the water hole during the process of lifting the immersed pipe;

[0019] S7, during the pumping process, the immersed pipe is continuously lifted upward until the pile tip mechanism is lifted out of the pile hole; then the immersed pipe is moved to the next pile position, and steps S2 to S7 are repeated;

[0020] S8. Level the site, compact the ground, lay the cushion layer, and complete the foundation treatment construction.

[0021] Furthermore, step S1 also includes vacuum well point dewatering, arranging and installing vacuum pipes, main pipelines and drainage channels to ensure that the vacuum dewatering water level drops to the pile bottom elevation and the dewatering continues.

[0022] Furthermore, multiple pile holes are arranged in a square shape, and the distance between the pile holes is calculated according to the following formula:

[0023]

[0024] Where: s is the pile hole spacing (m), d is the average diameter of the pile body (m); l is the pile spacing correction coefficient, which is 1.1~1.15; e1 is the porosity of sand after dewatering treatment of foundation soil, and e2 is the porosity required to be achieved after vibration compaction of foundation soil.

[0025] Furthermore, in step S7, the lifting speed of the immersed tube is 1.6 m / min to 2 m / min.

[0026] The beneficial effects of the present invention are:

[0027] The multi-point high-frequency vibration compaction equipment and the construction method of the present invention use the multi-point high-frequency vibration compaction equipment. The loose liquefied sand and silt will be quickly liquefied during the high-frequency vibration compaction process, and a large amount of water in the soil will be discharged. The particles will be rearranged and compacted, which will accelerate the instantaneous settlement and consolidation settlement, and the bearing capacity characteristic value will be greatly improved; at the same time, the radial and vertical drainage paths of the pore water in the soil will be shortened, and the drainage effect will be significant; under the action of the high-frequency vibrator, multiple immersed tubes can form multiple holes at one time, which improves the work efficiency and saves more than 40% of the construction period. The drainage method combining vacuum well point dewatering and pumping water in the immersed tube can not only reduce the water level in the entire construction area, but also timely drain the groundwater in the pile hole in a targeted manner. There is no need to dig a sump or drainage ditch, and it occupies a small area and is low in cost. During the construction process, there is no need to pour fillers into the pile hole, which saves resources and costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural diagram of the multi-point high-frequency vibration compaction device of the present invention;

[0029] Figure 2This is a front view of the pile tip mechanism of the multi-point high-frequency vibration compaction device of the present invention when it is opened;

[0030] Figure 3 It is a front view of the pile tip mechanism of the multi-point high-frequency vibration compaction device of the present invention when it is closed;

[0031] Figure 4 It is a cross-sectional view of the immersed tube of the present invention.

[0032] Description of reference numerals:

[0033] 1. Mechanical arm; 2. High-frequency vibrator; 3. Immersed tube; 31. Water inlet; 32. Water outlet; 33. Water hole; 34. Boss; 35. Inclined portion; 36. Filter chamber; 37. Filter screen; 4. Pile tip mechanism; 41. First pile tip; 411. Slide groove; 4111. First straight groove; 4112. Second straight groove; 4113. Arc groove; 412. Abutment portion; 4121. Tip plug; 42. Second pile tip. DETAILED DESCRIPTION

[0034] The technical scheme in the embodiment of the present invention is described clearly and completely below in conjunction with the accompanying drawings in the embodiment of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] like Figure 1 to Figure 4 The multi-point high-frequency vibration compaction equipment of the present invention is shown, including a mechanical arm 1, the end of the mechanical arm 1 is fixedly connected to a high-frequency vibrator 2, the bottom of the high-frequency vibrator 2 is fixedly connected to a plurality of immersed tubes 3, each immersed tube 3 is provided with a water inlet 31 and a water outlet 32, the interior of the immersed tube 3 is also provided with a water hole 33 along its axial direction, one end of the water hole 33 is connected to the water inlet 31, and the other end is connected to the water outlet 32, and the lower part of each immersed tube 3 is provided with a pile tip mechanism 4 that can be opened and closed automatically, when the pile tip mechanism 4 is opened, the water inlet 31 is connected to the outside world, and when the pile tip mechanism 4 is closed, the water inlet 31 is disconnected from the outside world.

[0036] In this embodiment, an excavator (not shown in the figure) is used. After the excavator moves to the construction location, the movement of the mechanical arm 1 is controlled. Figure 1As shown, the end of the mechanical arm 1 is fixedly connected with a high-frequency vibrator 2, and the bottom of the high-frequency vibrator 2 is fixedly connected with two immersed tubes 3. The number of immersed tubes 3 can also be three, four or more, which is not limited here and can be designed according to actual needs. The setting of multiple immersed tubes 3 makes the number of holes formed at one time also multiple, which improves the work efficiency. Multiple immersed tubes 3 can resonate under the action of the high-frequency vibrator 2. At this time, the amplitude of the soil particles is large, and the vibration speed and acceleration are also high enough, which can quickly destroy the adhesion between the immersed tube 3 and the soil, so that the immersed tube 3 and the soil transition from a compacted state to an instantaneous separation state, thereby reducing the resistance of the immersed tube 3. The immersed tube 3 is easier to sink under the action of the high-frequency vibrator 2 and its own weight, which improves efficiency. In addition, during the resonance process, the soil particles are subjected to strong vibration, and will be rearranged and become more compact. This helps to improve the bearing capacity and stability of the foundation and make the foundation more solid.

[0037] In this embodiment, the immersed tube 3 is a square tube, and the lower part of each immersed tube 3 is provided with a pile tip mechanism 4 that can be opened and closed automatically. When the pile tip mechanism 4 is opened, the water inlet 31 is connected to the outside, and when the pile tip mechanism 4 is closed, the water inlet 31 is disconnected from the outside. The pile tip mechanism 4 includes a first pile tip 41 and a second pile tip 42. The first pile tip 41 and the second pile tip 42 are relatively opened and closed and arranged on both sides of the immersed tube 3. The first pile tip 41 and the second pile tip 42 are provided with a slide groove 411, and a convex column 34 is correspondingly convexly provided on the immersed tube 3. The first pile tip 41 and the second pile tip 42 are respectively sleeved on the outer side of the convex column 34 through the slide groove 411. The first pile tip 41 and the second pile tip 42 can slide and rotate along the slide groove 411 through the cooperation of the slide groove 411 and the convex column 34. The slide groove 411 is a Z-shaped structure. Specifically, the slide groove 411 includes a first straight groove 4111 and a second straight groove 4112. The first straight groove 4111 and the second straight groove 4112 are connected by an arc groove 4113. The first straight groove 4111 is vertically arranged, and the second straight groove 4112 forms an angle with the first straight groove 4111. Figure 2 The pile tip mechanism 4 is shown in an open state, at which the top of the first linear groove 4111 abuts against the top of the boss 34, and the first linear groove 4111 is parallel to the length direction of the immersed tube 3. The boss 34 is a long columnar structure, and the boss 34 abuts against the first linear groove 4111 and the second linear groove 4112 respectively, and slides along its track in the slide groove 411. The setting of the arc groove 4113 makes it easier for the boss 34 to slide in the slide groove 411.

[0038] The first pile tip 41 and the second pile tip 42 are both U-shaped structures. The first pile tip 41 and the second pile tip 42 are respectively provided with abutment parts 412 inclined outward from top to bottom on the opposite sides. The bottom of the abutment parts 412 forms a tip plug 4121. The tip plug 4121 is located below the immersed tube 3 and has a certain distance from the bottom of the immersed tube 3. The two sides of the bottom of the immersed tube 3 are symmetrically provided with inclined parts 35 inclined inward from top to bottom. The setting of the inclined parts 35 prevents the inner wall of the first pile tip 41 and the second pile tip 42 of the U-shaped structure from interfering with the outer wall of the immersed tube 3 when the first pile tip 41 and the second pile tip 42 slide and rotate with the protrusion 34.

[0039] like Figure 4 As shown, each immersed tube 3 is provided with a water inlet 31 and a water outlet 32. The water inlet 31 is located at the bottom of the immersed tube 3, and the water outlet 32 ​​is located on one side above the immersed tube 3. A water hole 33 is also provided inside the immersed tube 3 along its axial direction. One end of the water hole 33 is connected to the water inlet 31, and the other end is connected to the water outlet 32. A filter chamber 36 is also provided at the lower part of the immersed tube 3. A filter screen 37 is installed at the inlet end of the filter chamber 36, and the outlet end of the filter chamber 36 is connected to the water hole 33. The filter chamber 36 is in the shape of a trumpet, and the size of the lower opening is larger than the size of the upper opening, so that more groundwater can smoothly enter the immersed tube 3. The mesh size of the filter screen 37 is selected according to the soil layer, and is not limited here. The filter screen 37 is used to filter stones, sand and gravel to prevent them from entering the water hole 33 and blocking the pipeline.

[0040] The present invention also discloses a method for using a multi-point high-frequency vibration compacting device, which includes the following steps:

[0041] S1. Clean and level the construction site, measure and lay out the lines, and arrange the pile positions; it also includes vacuum well point dewatering, arranging and installing vacuum pipes, main pipelines and drainage channels to ensure that the vacuum dewatering water level drops to the pile bottom elevation and continuous dewatering. The water pump uses a vacuum pump. After all the pipes are connected, the vacuum pump is connected to the vacuum pipe. When connecting the pipes, the joints should be sealed to ensure that the pumping system does not leak water or air. During dewatering, the vacuum degree of the vacuum pump should be kept above 85kPa, and water should be pumped continuously to improve the dewatering efficiency and ensure the dewatering effect. In addition, continuous pumping can keep the groundwater flow unobstructed and prevent blockage caused by impurity deposition and other reasons. Using vacuum well point dewatering can effectively reduce the groundwater level in the construction area, increase the effective stress of the soil, reduce the porosity, increase the compression modulus, and improve the bearing capacity of the foundation.

[0042] S2, the excavator enters the site, drives the excavator to the construction site, and controls the mechanical arm 1 to drive the immersed tube 3 to move, so that the pile tip mechanism 4 at the bottom is aligned with the pile position. At this time, the first pile tip 41 and the second pile tip 42 are in the open state, and the water inlet 31 at the bottom of the immersed tube 3 is exposed to the outside, and the water inlet 31 is connected to the outside. Figure 2 As shown, the top of the first straight groove 4111 of the first pile tip 41 and the second pile tip 42 abuts against the top of the protrusion 34, and the length direction of the first pile tip 41 and the second pile tip 42 are parallel to the length direction of the immersed tube 3. The water pump is connected to one end of the water pumping pipe, and the other end of the water pumping pipe is placed in the water hole 33. Preferably, in order to facilitate water pumping, the other end of the water pumping pipe can be arranged near the bottom of the immersed tube 3. The water pumping pipe can be a hose, which is convenient for moving up and down with the immersed tube 3.

[0043] S3, turn on the high-frequency vibrator 2, and the tip plug 4121 at the bottom of the abutment 412 of the first pile tip 41 and the second pile tip 42 is first inserted into the ground. At this time, there is a distance between the bottom of the immersed tube 3 and the ground. As the tip plug 4121 continues to move downward, under the combined action of the upward thrust of the soil and the vertical downward exciting force of the high-frequency vibrator 2, the first pile tip 41 and the second pile tip 42 slide upward along the direction of the slide groove 411 and rotate around the protrusion 34 under the cooperation of the slide groove 411 and the protrusion 34 until the first pile tip 41 and the second pile tip 42 abut the abutment 412. At this time, the bottom of the second linear groove 4112 also just abuts the bottom of the protrusion 34, and the first pile tip 41 and the second pile tip 42 are in a closed state. Figure 3 As shown, at this time, the closed first pile tip 41 and the second pile tip 42 enclose the water inlet 31 of the immersed tube 3 in the pile tip mechanism 4, the water inlet 31 is disconnected from the outside, and groundwater cannot enter the water hole 33 of the immersed tube 3. Moreover, the tip plugs 4121 of the closed first pile tip 41 and the second pile tip 42 form a conical structure, which is easier to insert into the ground.

[0044] S4. The closed first pile tip 41 and the second pile tip 42 drive the immersed tube 3 to continue to be inserted into the ground under the action of the high-frequency vibrator 2 until they sink into the designed elevation of the pile bottom to form a pile hole. High-frequency vibration compacts the soil laterally. Lateral compaction refers to the horizontal vibration compaction of the soil, that is, making the soil denser in the horizontal direction. The high-frequency vibration compaction hole-forming method has no noise pollution and does not require water, while other hole-forming methods such as impact hole-forming, hammer hole-forming and hydraulic punching have noise pollution or require a large amount of water, resulting in a waste of water resources. High-frequency vibration causes medium-dense or loose saturated sand layers and silt layers to liquefy, the particles are rearranged, the pores are reduced, and the bearing capacity is improved.

[0045] S5, the mechanical arm 1 slowly lifts the immersed tube 3 upwards, and when the first pile tip 41 and the second pile tip 42 are separated from the soil below them, they slide downward along the slide groove 411 and rotate under their own weight until the pile tip mechanism 4 is opened, and the top of the first straight groove 4111 just abuts against the top of the protrusion 34, and the first straight groove 4111 is parallel to the length direction of the immersed tube 3. Figure 2As shown, at this time, the water inlet 31 of the immersed tube 3 is not surrounded by the first pile tip 41 and the second pile tip 42, and the water inlet 31 is exposed to the outside. The groundwater in the pile hole flows into the water hole 33 in the immersed tube 3 through the water inlet 31.

[0046] S6. Turn off the high-frequency vibrator 2, start the water pump, and pump out the groundwater in the pile hole through the pumping pipe and the water hole 33 during the process of lifting the immersed tube 3. Stop lifting the immersed tube 3 after each lifting height of 0.6-0.8m, and continue lifting after a stay time of 1-2min. The lifting speed of the immersed tube 3 is 1.6m / min~2m / min, so that the immersed tube 3 is slowly lifted to discharge the groundwater in the immersed tube 3 in a timely and sufficient manner.

[0047] S7, during the pumping process, continue to lift the immersed tube 3 upward until the pile tip mechanism 4 is lifted out of the pile hole; then move the immersed tube 3 to the next pile position, and repeat steps S2 to S7. Multiple pile holes are arranged in a square, and the distance between the pile holes is calculated according to the following formula:

[0048]

[0049] In the formula: s is the pile hole spacing (m), d is the average diameter of the pile body (m); l is the pile spacing correction coefficient, which is 1.1~1.15; e1 is the porosity of sand after foundation soil dewatering treatment, and e2 is the porosity required to be achieved after foundation soil compaction.

[0050] S8, level the site, perform rolling construction, lay the cushion layer, and complete the foundation treatment construction. In this embodiment, the rolling construction equipment uses an 8t-20t roller, and the number of rolling times is not less than 6-8 times. Through rolling construction, the vacuum forced drainage effect is increased, the void ratio is further reduced, the compression modulus is increased, the pile-soil integrity is improved, and the foundation bearing capacity is improved.

[0051] Although the present invention discloses preferred specific embodiments to achieve the above-mentioned objectives, it is not intended to limit the structural features of the present invention. Any person skilled in the art should know that within the technical spirit of the present invention, any easily conceivable changes or modifications are possible and are all covered by the scope of the patent application of the present invention.

Claims

1. A multi-point high-frequency vibration device, characterized in that: The invention comprises a mechanical arm (1), the end of which is fixedly connected to a high-frequency vibrator (2), the bottom of which is fixedly connected to a plurality of immersed tubes (3), each of which is provided with a water inlet (31) and a water outlet (32), the interior of the immersed tube (3) is also provided with a water through hole (33) along its axial direction, one end of the water through hole (33) is connected to the water inlet (31), and the other end is connected to the water outlet (32), and the lower part of each immersed tube (3) is provided with a pile tip mechanism (4) that can be opened and closed automatically, when the pile tip mechanism (4) is opened, the water inlet (31) is connected to the outside, and when the pile tip mechanism (4) is closed, the water inlet (31) is disconnected from the outside.

2. The multi-point high-frequency vibration equipment according to claim 1, characterized in that: The pile tip mechanism (4) comprises a first pile tip (41) and a second pile tip (42), the first pile tip (41) and the second pile tip (42) are relatively opened and closed and arranged on both sides of the immersed tube (3), the first pile tip (41) and the second pile tip (42) are both provided with a slide groove (411), the immersed tube (3) is correspondingly provided with a convex column (34), and the first pile tip (41) and the second pile tip (42) are respectively sleeved on the outer side of the convex column (34) through the slide groove (411).

3. The multi-point high-frequency vibration equipment according to claim 2, characterized in that: The slide groove (411) is a Z-shaped structure, and the protruding column (34) is a long columnar structure.

4. The multi-point high-frequency vibration equipment according to claim 2, characterized in that: The first pile tip (41) and the second pile tip (42) are both U-shaped structures. The first pile tip (41) and the second pile tip (42) are respectively provided with abutment portions (412) inclined outward from top to bottom on opposite sides thereof. A tip plug (4121) is formed at the bottom of the abutment portion (412). The tip plug (4121) is located below the immersed tube (3) and has a certain distance from the bottom of the immersed tube (3).

5. The multi-point high-frequency vibration equipment according to claim 1, characterized in that: Inclined portions (35) that are inclined inwards from top to bottom are symmetrically arranged on both sides of the bottom of the immersed tube (3).

6. The multi-point high-frequency vibration compaction equipment according to claim 1, characterized in that: A filter chamber (36) is provided at the lower part of the immersed tube (3), a filter screen (37) is installed at the inlet end of the filter chamber (36), and the outlet end of the filter chamber (36) is connected to the water passage hole (33).

7. A method for using a multi-point high-frequency vibration device, characterized in that: Using the multi-point high-frequency vibration compaction device as claimed in any one of claims 1 to 6 comprises the following steps: S1. Clean and level the construction site, measure and lay out the lines, and arrange the pile positions; S2, the mechanical arm (1) drives the immersed tube (3) to move so that the pile tip mechanism (4) at the bottom thereof is aligned with the pile position. At this time, the first pile tip (41) and the second pile tip (42) are in an open state, the water pump is connected to one end of the water pumping pipe, and the other end of the water pumping pipe is placed in the water hole (33); S3, turning on the high-frequency vibrator (2), the tip plug (4121) at the bottom of the abutment portion (412) of the first pile tip (41) and the second pile tip (42) is first inserted into the ground, at which time there is a distance between the bottom of the immersed tube (3) and the ground, and as the tip plug (4121) continues to move downward, under the combined action of the upward thrust of the soil and the vertical downward exciting force of the high-frequency vibrator (2), the first pile tip (41) and the second pile tip (42) slide upward along the direction of the slide groove (411) and rotate around the protrusion (34) in cooperation with the slide groove (411) and the protrusion (34), until the abutment portion (412) of the first pile tip (41) and the second pile tip (42) abuts against each other, and the first pile tip (41) and the second pile tip (42) are in a closed state; S4, the closed first pile tip (41) and the second pile tip (42) drive the immersed pipe (3) to be inserted into the ground under the action of the high-frequency vibrator (2) until the immersed pipe (3) is sunk to the designed elevation of the pile bottom to form a pile hole; S5, the mechanical arm (1) slowly lifts the immersed tube (3) upwards, and when the first pile tip (41) and the second pile tip (42) are separated from the soil below them, they slide downwards along the slide groove (411) and rotate under the action of their own weight until the pile tip mechanism (4) is opened, and the groundwater in the pile hole flows into the immersed tube (3); S6, turning off the high-frequency vibrator (2), turning on the water pump, and pumping out the groundwater in the pile hole through the pumping pipe and the water hole (33) during the process of lifting the immersed pipe (3); S7, during the pumping process, the immersed tube (3) is continuously lifted upward until the pile tip mechanism (4) is lifted out of the pile hole; then the immersed tube (3) is moved to the next pile position, and steps S2 to S7 are repeated; S8. Level the site, compact the ground, lay the cushion layer, and complete the foundation treatment construction.

8. The method for using the multi-point high-frequency vibration compaction device according to claim 7, characterized in that: Step S1 also includes vacuum well point dewatering, arranging and installing vacuum pipes, main pipelines and drainage channels to ensure that the vacuum dewatering water level drops to the pile bottom elevation and the dewatering continues.

9. The method for using the multi-point high-frequency vibration compaction device according to claim 7, characterized in that: Multiple pile holes are arranged in a square, and the distance between the pile holes is calculated according to the following formula: Where: s is the pile hole spacing (m), d is the average diameter of the pile body (m); l is the pile spacing correction coefficient, which is 1.1~1.15; e1 is the porosity of sand after dewatering treatment of foundation soil, and e2 is the porosity required to be achieved after vibration compaction of foundation soil.

10. The method for using the multi-point high-frequency vibration compaction device according to claim 7, characterized in that: In step S7, the lifting speed of the immersed tube (3) is 1.6 m to 2 m / min.

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