Vacuum preloading and dynamic compaction combined soft foundation treatment method

Abstract

The invention discloses a vacuum preloading and dynamic compaction combined soft foundation treatment method which comprises the steps that a plurality of dynamic compaction holes are formed in a soft soil foundation construction site at intervals, vertical water pumping pipes are arranged in the dynamic compaction holes, and gaps between the vertical water pumping pipes and the dynamic compaction holes are filled with gravels; a plurality of vertical plastic drainage belts are arranged on the periphery of each dynamic compaction hole at intervals, and a sand layer is laid on the surface of the site and then covered with a film for sealing; the vertical plastic drainage belt in the thin film and the stratum are in a partial vacuum state through suction of a vacuum pump, and underground water is pumped and drained outwards; meanwhile, underground water in the dynamic compaction hole is sucked and discharged through a water suction pump and a vertical water suction pipe; and after first-stage vacuum preloading is completed, in-hole dynamic compaction operation is conducted on the dynamic compaction holes in sequence, gravel in the dynamic compaction holes is rammed through a conical rammer and extruded towards the outer side, and extrusion drainage consolidation of a soil body in the stratum is achieved. The method has the advantage that the construction efficiency of drainage consolidation of the soil body is improved in a vacuum preloading and dynamic compaction mode.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation reinforcement, and in particular relates to a vacuum preloading combined with strong compaction soft foundation treatment method. Background Art

[0002] In construction projects, we often encounter some soft soils or soft soil layers with high water content. The characteristics of this kind of soil are high water content, high compressibility, low strength and poor permeability. For this kind of foundation, especially for large-scale construction, such as building docks, airports, roads and houses on this foundation, the foundation needs to be treated and reinforced.

[0003] As a large-area soft foundation reinforcement technology, vacuum preloading has been widely used in my country since the 1980s because of its low engineering cost and good reinforcement effect. The basic method is: a plastic drain board is set as a vertical drainage channel in the soft soil foundation to be reinforced, and a horizontal drainage channel composed of a sand cushion layer and a mesh drainage filter pipe laid on the ground is matched, and an airtight sealing membrane is covered on it. Through the water absorption channel buried in the sand cushion layer, a vacuum device is used to evacuate air, and the air in the foundation in the membrane is discharged through the membrane device, so that an air pressure difference is generated inside and outside the membrane. This air pressure difference is the load acting on the foundation. As the air in the membrane is continuously discharged, the air pressure difference gradually increases, and the water and air in the foundation are continuously discharged to consolidate the foundation, thereby improving the strength of the soft soil foundation. If the foundation with a plastic drain board is vacuumed, if it is assumed that the negative pressure is not lost through the plastic drain board, the negative pressure will work within the depth range of the plastic drain board, and it is almost rectangularly distributed, so the air-tight effect is good, the vacuum degree is high, and the consolidation effect is good. When the same vertical deformation is generated, the reinforcement effect of vacuum preloading method is better than that of other methods.

[0004] However, the problem with vacuum preloading is that the drainage time is long, the drainage path is single, and it is impossible to ensure uniform drainage of the soil, thereby failing to ensure the strength and stability of soft soil consolidation. Summary of the invention

[0005] The purpose of the present invention is to provide a vacuum preloading combined with dynamic compaction soft foundation treatment method based on the above-mentioned deficiencies of the prior art, which improves the drainage and reinforcement efficiency of foundation treatment by combining the vacuum preloading drainage method with the in-hole dynamic compaction drainage method.

[0006] The purpose of the present invention is achieved by the following technical solutions: A vacuum preloading combined with dynamic compaction soft foundation treatment method, characterized in that the treatment method comprises the following steps: S1: In the soft soil foundation construction site, a number of dynamic tamping holes are opened at intervals, a vertical water pumping pipe is arranged in each of the dynamic tamping holes, and gravel is buried in the gap between the vertical water pumping pipe and the dynamic tamping hole; the top of each of the vertical water pumping pipes is respectively connected to a horizontal water pumping branch pipe and distributed on the surface of the soft soil foundation construction site, each of the horizontal water pumping branch pipes is connected in parallel with a horizontal water pumping main pipe, and a water pump is arranged on the horizontal water pumping main pipe; S2: a plurality of vertical plastic drainage belts are arranged at intervals around the periphery of each of the tamping holes, a sand layer is laid on the surface of the soft soil foundation construction site, and then a film is covered to form a seal; a plurality of suction hoses are arranged on the film and each of the suction hoses is connected to a suction main pipe, and a vacuum pump is arranged on the suction main pipe; S3: The vertical plastic drainage belt and the ground in the film are placed in a partial vacuum state by suction through the vacuum pump, so as to remove moisture in the ground through the vertical plastic drainage belt and drain water outward through the suction hose and the suction main pipe; at the same time, the groundwater in the tamping hole is sucked out through the water pump and the vertical water pumping pipe; S4: Regularly check the effect of vacuum preloading, and stop vacuum preloading if the initial bearing capacity and deformation indicators required by the design are met; then perform tamping operations on each of the tamping holes in turn, and the method for tamping operations in the holes is as follows: release the connection between the vertical water pumping pipe and the horizontal water pumping branch pipe and lift the tamping hole, drive the body of the tamping machine to the position of the tamping hole, lift the conical tamping hammer on the tamping machine to a predetermined drop distance and then release it downward, the conical tamping hammer impacts the gravel in the tamping hole and squeezes the gravel outward, so as to squeeze the soft soil foundation so that the water in the stratum can be further pumped out through the vertical water pumping pipes in the remaining tamping holes; lift the conical tamping hammer and reciprocate to perform tamping in the hole.

[0007] The film is divided into several pieces and covers the sand layer of the soft soil foundation construction site. When the strong compaction operation is performed on the strong compaction hole, the film in the area is taken out.

[0008] The tamping holes on the soft soil foundation construction site are divided into an outer circle, a middle circle and an inner circle, and tamping operations are performed on each of the tamping holes in sequence according to the outer circle, the middle circle and the inner circle.

[0009] The lower end of the conical rammer is conical and the upper end is arc-shaped.

[0010] The dynamic tamping machine comprises a machine body, an arm, a first cable mechanism, a second cable mechanism, a locking control mechanism and a tamping hammer; The first cable mechanism comprises a first hoisting unit, a first cable and a first fixed pulley mechanism, wherein the first hoisting unit is fixedly arranged on the rotatable platform of the machine body, and the first fixed pulley mechanism is composed of a plurality of first fixed pulleys and the first fixed pulleys are arranged along the upper part and the top end of the boom; one end of the first cable is wound around the first hoisting unit, and the other end of the first cable is guided by the first fixed pulley mechanism and extends downward to be connected with the top end of the locking control mechanism; The second cable mechanism includes a second hoisting unit and a second cable, wherein the second hoisting unit is fixedly arranged at the lower end of the boom, one end of the second cable is wound around the second hoisting unit, and the other end of the second cable passes through the locking control mechanism and hoists the rammer; The locking control mechanism includes a control box body, a second fixed pulley mechanism, a first hydraulic cylinder and a second hydraulic cylinder. The control box body is suspended by the first cable. The second fixed pulley mechanism includes a plurality of second fixed pulleys and the second fixed pulleys are arranged at the top and inside of the control box body. The first hydraulic cylinder is arranged below the second fixed pulley inside the control box body and is located on one side. The second hydraulic cylinder is arranged below the first hydraulic cylinder and is located on the other side opposite to the first hydraulic cylinder.

[0011] The second winch group includes a primary winch and a secondary winch, and the primary winch and the secondary winch are arranged in sequence at the bottom of the boom, one end of the second cable is wound around the secondary winch, and the other end of the second cable is wound around the secondary winch and extends to the primary winch for winding, and then extends upward and enters the control box body through the guidance of the second fixed pulley mechanism, the rotating shaft of the primary winch is driven by a slidable motor, the base of the slidable motor is mounted on slide rails on both sides, and the slidable motor is driven to slide by a first hydraulic telescopic rod and a second hydraulic telescopic rod respectively arranged on both sides to realize the clutch between the output shaft end of the slidable motor and the rotating shaft end of the primary winch.

[0012] A first pressing roller is disposed at the end of the first hydraulic cylinder, and a second pressing roller is disposed at the end of the second hydraulic cylinder. A plurality of irregular grooves are formed on the surfaces of the first pressing roller and the second pressing roller.

[0013] A plurality of water filtering holes are provided on the pipe body of the vertical water pumping pipe.

[0014] The advantages of the present invention are: (1) Through vacuum preloading and in-hole tamping, the construction efficiency of soil drainage and consolidation can be improved. The treated foundation meets the requirements of strength, deformation, dynamic stability and permeability, achieving the purpose of reducing the settlement or uneven settlement caused by the foundation under load; (2) It improves the disadvantage of slow speed in vacuum preloading treatment of soft soil foundation. On the basis of draining and consolidating the soil, it further improves the consolidation degree of the soil by compacting the soil, and at the same time squeezes the groundwater into the vacuum preloading area for discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a vertical cross-sectional view of the soft soil foundation construction site during construction treatment in the present invention; Figure 2 It is a partial plane schematic diagram of the construction treatment in the soft soil foundation construction site of the present invention; Figure 3 It is a schematic diagram of the body of the dynamic compaction machine in the present invention; Figure 4 It is a schematic diagram of the compaction machine body in the present invention driving the conical compaction machine to fall into the compaction hole; Figure 5 It is a schematic diagram of the conical rammer in the present invention performing strong tamping in a hole; Figure 6 It is a partial enlarged detailed view of the locking control mechanism of the present invention without clamping the second cable; Figure 7 It is a partial enlarged detailed view of the locking control mechanism clamping the second cable in the present invention; Figure 8 It is a plan view of the second winch unit on the compaction machine body in the present invention. DETAILED DESCRIPTION

[0016] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-8, the marks in the figure are: vertical plastic drainage belt 1, tamping hole 2, gravel 3, vertical water pump 4, sand layer 5, suction hose 6, suction main pipe 7, vacuum pump 8, film 9, tamping machine body 10, rotatable platform 10a, boom 10b, first winch unit 11, first fixed pulley mechanism 12, first cable 13, second winch unit 14, first winch 14a, second winch 14b, first hydraulic telescopic rod 14c, motor 14d, motor 14e, second hydraulic telescopic rod 14f, slide rail 14g, second cable 15, locking control mechanism 16, control box body 16a, lifting ear 16b, first hydraulic cylinder 16c, second hydraulic cylinder 16d, first clamping roller 16e, second clamping roller 16f, conical rammer 17, second fixed pulley mechanism 18, first fixed pulley 18a, second fixed pulley 18b.

[0017] Example: Figure 1-8 As shown, this embodiment specifically relates to a vacuum preloading combined with dynamic compaction soft foundation treatment method, and the treatment method specifically includes the following steps: (S1) Figure 1 , 2 As shown, in the soft soil foundation construction site, a number of strong tamping holes 2 are opened at intervals, such as Figure 2 The schematic plan view shown is a partial area of ​​the entire construction site.

[0018] A vertical water pumping pipe 4 is arranged in each tamping hole 2, and the diameter of the vertical water pumping pipe 4 should be 1 / 3 to 1 / 2 of the diameter of the tamping hole 2; gravel 3 is filled in the gap between the outer wall of the vertical water pumping pipe 4 and the inner wall of the tamping hole 2, and small-grained sand and gravel are preferably selected for the gravel 3 to facilitate water permeability; the top of each vertical water pumping pipe 4 is respectively connected to a horizontal water pumping branch pipe (not shown in the figure) and is distributed on the surface of the soft soil foundation construction site, and each horizontal water pumping branch pipe is connected in parallel with a horizontal water pumping main pipe (not shown in the figure), and a water pump (not shown in the figure) is arranged on the horizontal water pumping main pipe.

[0019] (S2) A plurality of vertical plastic drainage strips 1 are arranged at intervals on the periphery of each tamping hole 2, a sand layer 5 is laid on the surface of the soft soil foundation construction site, and then a thin film 9 is covered to form a seal; it should be noted that since the construction site is relatively large and there is a need for zoning construction, the covered film 9 is divided into several areas, so that it can be removed in batches during subsequent tamping; a plurality of suction hoses 6 are arranged on the film 9 and each suction hose 6 is connected to the same suction main pipe 7, a vacuum pump 8 is arranged on the suction main pipe 7, and each partition of the film 9 is connected to a suction hose 6.

[0020] (S3) After the arrangement of the tamping holes 2 and the vertical plastic drainage belt 1 is completed, the vertical plastic drainage belt 1 and the stratum in the film 9 are placed in a partial vacuum state by suction through the vacuum pump 8, so as to remove moisture in the stratum through the vertical plastic drainage belt 1 and drain the water outward through the suction hose 6 and the suction main pipe 7.

[0021] At the same time, groundwater in the stratum will also penetrate into the gravel 3 in the tamping hole 2. A number of water filtering holes are opened on the pipe body of the vertical pumping pipe 4 to facilitate water absorption. The groundwater in the tamping hole 2 is sucked out by the pump and the vertical pumping pipe 4.

[0022] (S4) The effect of the vacuum preloading in step S3 is regularly checked. If the initial bearing capacity and deformation indexes required by the design are met, the first stage of vacuum preloading is stopped, and then each tamping hole 2 is subjected to tamping operation in turn. Before the tamping operation in the hole, each tamping hole 2 in the construction site of the soft soil foundation is divided into an outer circle, a middle circle and an inner circle, regardless of whether the construction site is square or circular, and the tamping holes 2 in the outer circle, the middle circle and the inner circle are subjected to tamping operation in the order from the outside to the inside.

[0023] like Figure 1 , 2 As shown in Figures 3, 4, and 5, in this embodiment, the method of the strong compaction operation in the hole is as follows: first, according to the construction sequence from the outside to the inside, a piece of film 9 on the outer circle is removed and the films 9 in other positions are left unmoved, and the connection between the vertical pumping pipe 4 and the horizontal pumping branch pipe in the partition where the film 9 is located is released and lifted away from the strong compaction hole 2. After the vertical pumping pipe 4 is lifted away from the strong compaction hole 2, the gravel 3 is added to the hole to ensure that the gravel 3 in the hole is full. The strong compaction machine body 10 is driven to the position of the strong compaction hole 2, and the conical rammer 17 on the strong compaction machine body 10 is lifted to a predetermined drop distance and then released downward, and the conical rammer 17 impacts the gravel 3 in the strong compaction hole 2 and squeezes the gravel 3 outward, so as to squeeze the soft soil foundation so that the water in the stratum is further pumped out through the vertical pumping pipes in the other strong compaction holes 2, and discharged outward through the vertical plastic drainage belts 1 in the other areas; after the conical rammer 17 is lifted, the strong compaction in the hole is performed multiple times. It should be noted that the conical rammer 17 has a conical lower end and an arc-shaped upper end. The conical lower end facilitates its penetration into the gravel 3 in the tamping hole 2, while the arc-shaped upper end facilitates its extraction again after completion of penetration and tamping.

[0024] like Figure 1-8 As shown, the tamping machine used in this embodiment includes a tamping machine body 10, a first cable mechanism, a second cable mechanism, a locking control mechanism 16 and a conical rammer 17. A rotatable platform 10a and an arm 10b are provided on the tamping machine body 10.

[0025] like Figure 1-8As shown, the first cable mechanism includes a first hoisting unit 11, a first fixed pulley mechanism 12 and a first cable 13. The first hoisting unit 11 is composed of a hoist and a motor driving the hoisting unit to rotate, and the first fixed pulley mechanism 12 is composed of a plurality of first fixed pulleys. Figure 4 As shown, the first fixed pulleys are arranged at intervals on the upper back and top of the boom 10b, one end of the first cable 13 is wound and fixed on the first hoisting unit 11, and the other end of the first cable 13 extends upward from the first hoisting unit 11 and extends downward after being guided by the first fixed pulley mechanism 12 to be connected with the top end of the locking control mechanism 16. Specifically, a plurality of lifting ears 16b are distributed at intervals on the top surface of the control box body 16a of the locking control mechanism 16, and the lifting end of the first cable 13 is forked into multiple cables and respectively connected with the lifting ears 16b to achieve stable lifting.

[0026] like Figure 1-8 As shown, the second cable mechanism includes a second hoisting unit 14 and a second cable 15. The second hoisting unit 14 is fixedly arranged at the lower end of the boom 10b and faces the conical rammer 17. One end of the second cable 15 is wound around the second hoisting unit 14, and the other end of the second cable 15 passes through the locking control mechanism 16 and hoists the conical rammer 17. Specifically, the second hoisting unit includes a primary hoist 14a and a secondary hoist 14b. The primary hoist 14a and the secondary hoist 14b are arranged on the boom 10b. b is arranged in sequence, one end of the second cable 15 is wound on the secondary hoist 14b, and the other end of the second cable 15 is wound on the secondary hoist 14b and then extends to the primary hoist 14a for further winding, and then extends upward and enters the control box body 16a through the guidance of the second fixed pulley mechanism 18, and the second fixed pulley mechanism 18 includes a first fixed pulley 16a arranged at the outer corner position of the control box body 16a and a second fixed pulley 16b arranged in the control box body 16a. The rotating shaft of the primary hoist 14a is driven by a slidable motor 14d, the base of the slidable motor 14d is assembled on the slide rails 14g on both sides, and the slidable motor 14d is driven to slide by the first hydraulic telescopic rod 14c and the second hydraulic telescopic rod 14f arranged on both sides to realize the clutch between the output shaft end of the slidable motor 14d and the rotating shaft end of the primary hoist 14a. It should be noted that the first hydraulic telescopic rod 14c and the second hydraulic telescopic rod 14f achieve stable driving and locking of the slidable motor 14d through coordinated telescopic operation.

[0027] The locking control mechanism 16 includes a control box body 16a, a second fixed pulley mechanism 18, a first hydraulic cylinder 16c and a second hydraulic cylinder 16d. The control box body 16a is hoisted by the first cable 13. The first hydraulic cylinder 16c is arranged below the second fixed pulley 18b inside the control box body 16a and is located on one side. The second hydraulic cylinder 16d is arranged below the first hydraulic cylinder 16c and is located on the other side opposite to the first hydraulic cylinder. A first clamping roller 16e is fixedly provided at the end of the first hydraulic cylinder 16c and cannot rotate. A second clamping roller 16f is fixedly provided at the end of the second hydraulic cylinder 16d and cannot rotate. The surfaces of the first clamping roller 16e and the second clamping roller 16f are provided with a plurality of irregular grooves. The arrangement of the grooves can increase the friction with the second cable 15. It should be noted that when the first hydraulic cylinder 16c and the second hydraulic cylinder 16d push each other, the second cable 15 located therebetween can be clamped to form a temporary clamping fixation.

[0028] like Figure 1-8 As shown, the working method of using the compaction machine body 10 in this case to compact the compaction hole 2 includes the following steps: A: Move the installed tamping machine body 10 to the corresponding tamping hole 2 position, so that the locking control mechanism 16 clamps and locks the second cable 15 for hoisting the conical tamping hammer 17, and then control the locking control mechanism 16 and the conical tamping hammer 17 hoisted by the first cable 13 to a preset drop height through the first winch unit 11.

[0029] B: Stop the rotation of the first winch unit 11 and lock it, control the locking control mechanism 16 to release the clamping lock on the second cable 15, and gradually release the second cable 15 through the second winch unit 14 to achieve fine adjustment of the drop distance of the conical rammer 17; after completing the fine adjustment of the drop distance of the conical rammer 17, control the first hydraulic cylinder 16c and the second hydraulic cylinder 16d in the locking control mechanism 16 to push toward each other, so that the first clamping roller 16e on the first hydraulic cylinder 16c and the second clamping roller 16f on the second hydraulic cylinder 16d clamp and press the second cable 15; then control the first hydraulic telescopic rod 14c and the second hydraulic telescopic rod 14f in the second winch unit 14 to drive the sliding motor 14d to slide on the two side rails 14g, so that the output shaft end of the sliding motor 14d is separated from the rotating shaft end of the first winch 14a in the second winch unit 14.

[0030] C: Control the locking control mechanism 16 to release the clamping lock of the second cable 15, and the conical rammer 17 falls freely to ram the gravel 3 in the ramming hole 2. During the free fall of the conical rammer 17, the second cable 15 rotates freely on the primary winch 14a.

[0031] D: Control the first hydraulic telescopic rod 14c and the second hydraulic telescopic rod 14f to drive the output shaft end of the sliding motor 14d to engage with the rotating shaft end of the same-level winch 14a, and then lift the conical rammer 17 to the height of the locking control mechanism 16 through the second winch unit 14 and clamp and lock the second cable 15 through the locking control mechanism 16.

[0032] E: Repeat steps AD, and so on.

[0033] The beneficial effects of this embodiment are: (1) Through vacuum preloading and in-hole tamping, the construction efficiency of soil drainage and consolidation can be improved. The treated foundation meets the requirements of strength, deformation, dynamic stability and permeability, achieving the purpose of reducing the settlement or uneven settlement caused by the foundation under load; (2) It improves the disadvantage of slow speed in vacuum preloading treatment of soft soil foundation. On the basis of draining and consolidating the soil, it further improves the consolidation degree of the soil by compacting and consolidating the soil, and at the same time squeezes the groundwater into the vacuum preloading area for discharge; (3) The adjustment of the conical rammer drop distance adopts two sets of cable mechanisms, which can realize a wide range of coarse adjustment and fine adjustment, and realize the free adjustment of the rammer drop distance; (4) by providing a first hydraulic cylinder and a second hydraulic cylinder capable of pressing toward each other in the locking control mechanism, the second cable is temporarily clamped and locked, so as to facilitate the clutch between the output shaft end of the slidable motor and the rotating shaft end of the first winch in the second winch assembly; (5) The combination of the two sets of cable mechanisms and the locking control mechanism can absorb the upward rebound force generated when the locking control mechanism lowers the rammer through the locking control mechanism and the first cable connected to it. At the same time, the second cable connected to the rammer will also absorb the rebound force, thereby reducing the shaking effect on the machine body and the boom.

Claims

1. A method for treating soft foundation by vacuum preloading combined with dynamic compaction, characterized in that The processing method comprises the following steps: S1: In the soft soil foundation construction site, a number of dynamic tamping holes are opened at intervals, a vertical water pumping pipe is arranged in each of the dynamic tamping holes, and gravel is buried in the gap between the vertical water pumping pipe and the dynamic tamping hole; the top of each of the vertical water pumping pipes is respectively connected to a horizontal water pumping branch pipe and distributed on the surface of the soft soil foundation construction site, each of the horizontal water pumping branch pipes is connected in parallel with a horizontal water pumping main pipe, and a water pump is arranged on the horizontal water pumping main pipe; S2: a plurality of vertical plastic drainage belts are arranged at intervals around the periphery of each of the tamping holes, a sand layer is laid on the surface of the soft soil foundation construction site, and then a film is covered to form a seal; a plurality of suction hoses are arranged on the film and each of the suction hoses is connected to a suction main pipe, and a vacuum pump is arranged on the suction main pipe; S3: The vertical plastic drainage belt and the ground in the film are placed in a partial vacuum state by suction through the vacuum pump, so as to remove moisture in the ground through the vertical plastic drainage belt and drain water outward through the suction hose and the suction main pipe; at the same time, the groundwater in the tamping hole is sucked out through the water pump and the vertical water pumping pipe; S4: Regularly check the effect of vacuum preloading, and stop vacuum preloading if the initial bearing capacity and deformation indicators required by the design are met; then perform tamping operations on each of the tamping holes in turn, and the method for tamping operations in the holes is as follows: release the connection between the vertical water pumping pipe and the horizontal water pumping branch pipe and lift the tamping hole, drive the body of the tamping machine to the position of the tamping hole, lift the conical tamping hammer on the tamping machine to a predetermined drop distance and then release it downward, the conical tamping hammer impacts the gravel in the tamping hole and squeezes the gravel outward, so as to squeeze the soft soil foundation so that the water in the stratum can be further pumped out through the vertical water pumping pipes in the remaining tamping holes; lift the conical tamping hammer and reciprocate to perform tamping in the hole.

2. A vacuum preloading combined with dynamic compaction soft foundation treatment method according to claim 1, characterized in that The film is divided into several pieces and covers the sand layer of the soft soil foundation construction site. When the strong compaction operation is performed on the strong compaction hole, the film in the area is taken out.

3. A vacuum preloading combined with dynamic compaction soft foundation treatment method according to claim 2, characterized in that The tamping holes on the soft soil foundation construction site are divided into an outer circle, a middle circle and an inner circle, and tamping operations are performed on each of the tamping holes in sequence according to the outer circle, the middle circle and the inner circle.

4. The method for treating soft foundation by vacuum preloading combined with dynamic compaction according to claim 1, characterized in that The lower end of the conical rammer is conical and the upper end is arc-shaped.

5. The method for treating soft foundation by vacuum preloading combined with dynamic compaction according to claim 1 is characterized in that The dynamic tamping machine comprises a machine body, an arm, a first cable mechanism, a second cable mechanism, a locking control mechanism and a tamping hammer; The first cable mechanism comprises a first hoisting unit, a first cable and a first fixed pulley mechanism, wherein the first hoisting unit is fixedly arranged on the rotatable platform of the machine body, and the first fixed pulley mechanism is composed of a plurality of first fixed pulleys and the first fixed pulleys are arranged along the upper part and the top end of the boom; one end of the first cable is wound around the first hoisting unit, and the other end of the first cable is guided by the first fixed pulley mechanism and extends downward to be connected with the top end of the locking control mechanism; The second cable mechanism includes a second hoisting unit and a second cable, wherein the second hoisting unit is fixedly arranged at the lower end of the boom, one end of the second cable is wound around the second hoisting unit, and the other end of the second cable passes through the locking control mechanism and hoists the rammer; The locking control mechanism includes a control box body, a second fixed pulley mechanism, a first hydraulic cylinder and a second hydraulic cylinder. The control box body is suspended by the first cable. The second fixed pulley mechanism includes a plurality of second fixed pulleys and the second fixed pulleys are arranged at the top and inside of the control box body. The first hydraulic cylinder is arranged below the second fixed pulley inside the control box body and is located on one side. The second hydraulic cylinder is arranged below the first hydraulic cylinder and is located on the other side opposite to the first hydraulic cylinder.

6. A vacuum preloading combined with dynamic compaction soft foundation treatment method according to claim 5, characterized in that The second winch group includes a primary winch and a secondary winch, and the primary winch and the secondary winch are arranged in sequence at the bottom of the boom, one end of the second cable is wound around the secondary winch, and the other end of the second cable is wound around the secondary winch and extends to the primary winch for winding, and then extends upward and enters the control box body through the guidance of the second fixed pulley mechanism, the rotating shaft of the primary winch is driven by a slidable motor, the base of the slidable motor is mounted on slide rails on both sides, and the slidable motor is driven to slide by a first hydraulic telescopic rod and a second hydraulic telescopic rod respectively arranged on both sides to realize the clutch between the output shaft end of the slidable motor and the rotating shaft end of the primary winch.

7. A vacuum preloading combined with dynamic compaction soft foundation treatment method according to claim 6, characterized in that A first pressing roller is disposed at the end of the first hydraulic cylinder, and a second pressing roller is disposed at the end of the second hydraulic cylinder. A plurality of irregular grooves are formed on the surfaces of the first pressing roller and the second pressing roller.

8. The method for treating soft foundation by vacuum preloading combined with dynamic compaction according to claim 1, characterized in that A plurality of water filtering holes are provided on the pipe body of the vertical water pumping pipe.

Images