Horizontal-vertical drainage plate vacuum preloading combined with dynamic compaction soft foundation treatment system and method thereof

Abstract

The present application relates to a kind of horizontal-vertical drainage plate vacuum preloading combined dynamic compaction soft foundation treatment system, including preloading groove, vacuum pump and drainage plate system, drainage plate system includes horizontal drainage plate system and vertical drainage plate system composition, the horizontal drainage plate system and vertical drainage plate system are laid in preloading groove, the horizontal drainage plate system and vertical drainage plate system are respectively connected with external vacuum pump by first vertical drain pipe and second vertical drain pipe, the preloading groove top is laid sand cushion, ramming water pumping device is placed above sand cushion, and strong ramming point is positioned on the top of ramming water pumping device. Drainage rate is fast, soft foundation is uniformly drained, and settlement is greater, and overall structure is stable.

Description

Technical Field

[0001] This invention relates to the field of soft soil foundation treatment engineering, and in particular to a soft soil foundation treatment system combining horizontal and vertical drainage boards with vacuum preloading and dynamic compaction, and a method for soft soil foundation treatment combining horizontal and vertical drainage boards with vacuum preloading and dynamic compaction. Background Technology

[0002] my country's coastal and riverine areas contain vast amounts of soft soil. With increasingly scarce land available for construction, how to treat this soft soil to meet the needs of engineering projects has always been a technical challenge. In particular, the treatment of reclaimed soil in the southeastern coastal areas has become a key technology for port, transportation, and urban construction in these regions.

[0003] Traditional methods for treating soft soil foundations typically employ vacuum preloading, which involves embedding vertical or horizontal drainage systems within the soft soil and utilizing vacuum pumps. However, traditional vacuum preloading technology suffers from long drainage times, a single drainage path, and an inability to ensure uniform drainage, thus failing to guarantee the strength and stability of the consolidated soft soil. Therefore, a rapid drainage and consolidation method is needed to ensure effective consolidation, strength, and stability. This approach will undoubtedly offer significant economic and social benefits, generating substantial market demand, and its application and industrialization prospects are extremely broad. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a horizontal-vertical drainage board vacuum preloading combined dynamic compaction soft soil treatment system with good stability, fast drainage rate and greater settlement.

[0005] This invention is accomplished by the following technical solution: a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system, comprising a preloading tank, a vacuum pump, and a drainage board system. The drainage board system consists of a horizontal drainage board system and a vertical drainage board system, which are laid in the preloading tank. The horizontal and vertical drainage board systems are connected to an external vacuum pump through a first vertical drainage pipe and a second vertical drainage pipe, respectively. A sand cushion layer is laid on the top of the preloading tank, and a compaction water-collecting device is placed on top of the sand cushion layer. The top of the compaction water-collecting device has dynamic compaction points.

[0006] Furthermore, the horizontal drainage board system consists of multiple horizontally laid drainage boards arranged longitudinally; the vertical drainage board system consists of multiple vertically laid drainage boards arranged horizontally.

[0007] Furthermore, the transverse drainage board system is laid in the lower layer of the preloading trench, and the longitudinal drainage board system is laid on top of the transverse drainage board system.

[0008] Furthermore, the horizontal drainage board system includes multiple rows of horizontal drainage board groups, and the vertical drainage board system includes multiple rows of vertical drainage board groups, with each row of horizontal drainage board groups and each row of vertical drainage board groups distributed at intervals.

[0009] Furthermore, the tamping water-drawing device includes a tamping base and a tamping plate. The tamping plate is set at the opening on the tamping base, and a water storage area is formed between the tamping plate and the inner cavity of the tamping base. The bottom of the tamping base is provided with multiple through holes, each through hole is equipped with a water suction pipe, and the upper side wall of the water suction pipe has multiple water permeable channels. A piston is slidably installed inside the water suction pipe, and the upper end of the piston is fixed to the tamping plate by a connecting rod. Multiple buffer reset devices are also provided between the tamping plate and the tamping base.

[0010] Furthermore, the bottom of the suction pipe is flush with the bottom of the through hole, the upper end of the suction pipe extends to the water storage area, and the water permeable channel is set at the upper end of the suction pipe located in the water storage area.

[0011] Furthermore, a drain pipe communicating with the water storage area is provided on one side of the tamping seat, and the outer port of the drain pipe is connected to an external vacuum pump.

[0012] Furthermore, the buffer reset device includes a base, a guide post, and a reset spring. The upper end of the guide post is fixed to the lower end face of the tamping plate, and the lower end of the guide post extends to the base. The reset spring is sleeved on the guide post. After the tamping plate is subjected to force, the guide post moves downward along the base, causing the piston to slide along the water suction pipe.

[0013] Furthermore, a limiting edge is provided around the opening of the tamping seat, so that when the tamping plate is not under force, the tamping plate rests against the limiting edge.

[0014] The beneficial effects of this invention are as follows: The preloading trench features layered or spaced horizontal and vertical drainage board systems, fully utilizing the performance of drainage boards arranged in different directions. Their combined effect improves the transfer of vacuum throughout the soil. A dynamic compaction point is positioned at the top of the preloading trench. External dynamic compaction applies load to these points, significantly accelerating the drainage rate and resulting in greater settlement. Simultaneously, a tamping water-collecting device is installed at the top. Pore water generated within the soil during dynamic compaction is discharged through the drainage board system and vacuum pump. During the repeated alternation of hammering and removal, the tamping water-collecting device draws pore water generated at the top of the soil, collecting it through a suction pipe. This achieves drainage of the soft foundation at the top, accelerating the drainage speed and ensuring uniform drainage, thus stabilizing the overall structure. The high drainage rate further contributes to greater settlement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to the first embodiment; Figure 2 A schematic cross-sectional view of the water-drawing device using a ramming mechanism. Figure 3 for Figure 2 A schematic diagram of the structure of the rammed water-drawing device at point A; Figure 4 This is a schematic diagram of the structure of the ramming seat in the ramming water-drawing device; Figure 5 This is a schematic diagram of a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to the second embodiment; Figure 6 for Figure 5 A schematic diagram of the distribution of the drainage board system. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0017] Reference Figure 1-5 As shown, the first embodiment of the present invention provides a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system, including a preloading trench 1, a vacuum pump 2, and a drainage board system. The drainage board system consists of a horizontal drainage board system 3 and a vertical drainage board system 4, which are laid within the soft soil of the preloading trench 1. The horizontal drainage board system 3 and the vertical drainage board system 4 are respectively connected to the external vacuum pump 2 through a first vertical drainage pipe 5 and a second vertical drainage pipe 6. The horizontal drainage board system 3 and the vertical drainage board system 4 are distributed in layers within the preloading trench 1, giving full play to the performance of drainage boards with different arrangement directions, and their mutual cooperation improves the vacuum degree transmission effect throughout the soil. A sand cushion layer 7 is laid on top of the soft soil in the preloading trench, and a compaction water-collecting device 8 is placed on top of the sand cushion layer. The top of the compaction water-collecting device has a dynamic compaction point 81. The tamping hammer is lifted by a hoisting device and impacts the dynamic compaction point 81, applying a load to the point and accelerating the infiltration rate of pore water in the soft soil. Combined with the drainage board system, this significantly speeds up the drainage process, resulting in greater settlement. Simultaneously, a tamping water-collecting device 8 is installed at the top. Pore water generated within the soil during dynamic compaction is discharged through the drainage board system and a vacuum pump. During the repeated impact and withdrawal of the tamping hammer, the tamping water-collecting device draws pore water generated at the top of the soil and collects it through a suction pipe into the device 8, achieving drainage of the soft soil at the top, accelerating the drainage speed, and ensuring uniform drainage of the soft soil, thus stabilizing the overall structure.

[0018] The horizontal drainage board system 3 consists of multiple horizontally laid drainage boards arranged longitudinally. The vertical drainage board system 4 consists of multiple vertically laid drainage boards arranged horizontally. The horizontal drainage board system 3 is laid in the lower layer within the pre-compression trench 1, and the vertical drainage board system 4 is laid on top of the horizontal drainage board system 3. This layered drainage board system allows each type of drainage board to fully utilize its respective performance characteristics, resulting in a faster drainage rate.

[0019] The tamping water-drawing device 8 includes a tamping base 82 and a tamping plate 83. Multiple buffer and reset devices 84 are also provided between the tamping plate 83 and the tamping base 82. A limiting edge 821 is provided around the opening of the tamping base 82. The tamping plate 83 is positioned at the opening of the tamping base. When the tamping plate 83 is not under force, it rests against the limiting edge 821. A water storage area 85 is formed between the tamping plate 83 and the inner cavity of the tamping base 82. Multiple through holes 822 are provided at the bottom of the tamping base, each through hole is equipped with a hollow water suction pipe 86. The bottom of the water suction pipe is flush with the bottom of the through hole, and the upper end of the water suction pipe extends into the water storage area. Multiple permeable channels 861 on the upper sidewall of the water suction pipe are located within the water storage area. A piston 87 is slidably installed inside the water suction pipe, and the upper end of the piston is fixed to the tamping plate 83 by a connecting rod 88. A drain pipe 89, connecting to the water storage area, is provided on one side of the tamping base 82. The outer end of the drain pipe 89 is connected to an external drainage device 9, which can be a pumping device or a vacuum pump. During the tamping process, the tamping plate alternates between being under force and not under force. Pore water in the soft soil seeps out during the tamping process. The tamping plate pushes the piston to slide along the water suction pipe, extracting the pore water that has seeped to the top of the soft soil. The pore water is then drawn into the water storage area through the permeable channels and discharged through the drain pipe, accelerating the drainage speed. The bottom drainage system works in conjunction with the top tamping water suction device to ensure uniform drainage of the soft soil and overall structural stability.

[0020] The buffer reset device 84 includes a base 841, a guide post 842, and a reset spring 843. The upper end of the guide post 842 is fixed to the lower end face of the tamping plate 83, and the lower end of the guide post 842 extends to the base 841. The reset spring 843 is sleeved on the guide post. After the tamping plate 83 is subjected to force, the guide post 842 moves downward along the base, driving the tamping plate 83 to move along the tamping seat 82, thereby realizing the strong compaction load on the soft foundation in the preloading trench 1. At the same time, it drives the piston 87 to slide along the water suction pipe 86, realizing the drainage of pore water at the top of the soft foundation. While the piston 87 slides along the water suction pipe to draw water, it also dampens the up and down movement of the tamping plate. When the hammer leaves the tamping plate, it reduces the impact of the tamping plate's recovery, ensuring a more stable tamping process.

[0021] A construction method for a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 1, characterized by the following steps: (1) Prepare multiple drainage boards in advance and lay a horizontal drainage board system. Slurry is pumped into the preloading tank. When the slurry level reaches 40 cm, the first layer of horizontal drainage boards is laid horizontally. Each drainage board in the first layer is connected to the first vertical drainage pipe via a connector pipe. The outer end of the first vertical drainage pipe is connected to an external vacuum pump, and the system is immediately evacuated while slurry continues to be pumped into the preloading tank. When the slurry reaches a certain height, the second layer of horizontal drainage boards is laid. The second layer is connected to the first vertical drainage pipe via a connector pipe and is immediately evacuated while slurry continues to be pumped into the preloading tank. This process is repeated, with equal spacing between adjacent layers of horizontal drainage boards, until the final layer is laid and sealed with the first layer of sealing film. The system is then evacuated again while slurry continues to be pumped into the tank.

[0022] (2) Lay a vertical drainage board system. The mud is covered to halfway up the preloading trough. Multiple vertical drainage board systems are inserted into the upper layer of the preloading trough. The multiple vertical drainage board systems are arranged horizontally with equal spacing between adjacent vertical drainage board systems. The upper side of the vertically laid drainage board system is connected to the second vertical drainage pipe through a joint pipe. The second vertical drainage pipe is connected to an external vacuum pump. (3) Continue to transport mud to the top of the preloading tank, and lay a 0.5m sand cushion layer at the bottom of the mud, and immediately perform vacuuming; (4) A tamping water-collecting device is placed on the sand cushion layer. The hoisting device lifts the tamping hammer, and the tamping hammer strikes the tamping water-collecting device at the strong tamping point. The strong tamping point applies a load to the mud, while the vacuum pump continuously draws a vacuum. The strong tamping hammer strikes and leaves repeatedly and alternately. The tamping water-collecting device draws pore water generated at the top of the soil and collects it in the water storage area through the water suction pipe, and then discharges it through the drainage pipe.

[0023] Reference Figure 6 As shown, the second embodiment of the present invention provides a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system, which is basically the same as the first embodiment, except that: the horizontal drainage board system 3 includes multiple rows of horizontal drainage board groups, each row of horizontal drainage board groups consists of multiple horizontally laid drainage boards. The vertical drainage board system 4 includes multiple rows of vertical drainage board groups, each row of vertical drainage board groups consists of multiple vertically laid drainage boards. Each row of horizontal drainage board groups and each row of vertical drainage board groups are distributed at intervals. The horizontal and vertical drainage boards work together to expand the drainage range and achieve uniform drainage.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil foundation treatment system, comprising a preloading tank, a vacuum pump, and a drainage board system, characterized in that: The drainage board system consists of a horizontal drainage board system and a vertical drainage board system, which are laid in the preloading trench. The horizontal and vertical drainage board systems are connected to an external vacuum pump via a first vertical drainage pipe and a second vertical drainage pipe, respectively. A sand cushion layer is laid on top of the preloading trench, and a tamping and water-collecting device is placed above the sand cushion layer. The tamping and water-collecting device has a strong compaction point at its top. The tamping and water-collecting device includes a tamping base and a tamping plate. The tamping plate is positioned at the opening on the tamping base, forming a gap between the tamping plate and the inner cavity of the tamping base. In the water storage area, the bottom of the tamping seat is provided with multiple through holes, each of which is equipped with a water suction pipe. The bottom of the water suction pipe is flush with the bottom of the through hole, and the upper end of the water suction pipe extends to the water storage area. The upper side wall of the water suction pipe has multiple water permeable channels, which are located at the upper end of the water suction pipe in the water storage area. A piston is slidably installed inside the water suction pipe, and the upper end of the piston is fixed to the tamping plate by a connecting rod. Multiple buffer and reset devices are also provided between the tamping plate and the tamping seat. A drain pipe communicating with the water storage area is provided on one side of the tamping seat, and the outer port of the drain pipe is connected to an external drainage device.

2. The horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 1, characterized in that: A horizontal drainage board system consists of multiple drainage boards laid horizontally and arranged longitudinally; a vertical drainage board system consists of multiple drainage boards laid vertically and arranged horizontally.

3. The horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 2, characterized in that: The transverse drainage board system is laid in the lower layer of the preloading trench, and the longitudinal drainage board system is laid on top of the transverse drainage board system.

4. The horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 1, characterized in that: The horizontal drainage board system includes multiple rows of horizontal drainage board groups, and the vertical drainage board system includes multiple rows of vertical drainage board groups. Each row of horizontal drainage board groups is spaced apart, and each row of vertical drainage board groups is spaced apart.

5. The horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 1, 2, 3, or 4, characterized in that: The buffer reset device includes a base, a guide post, and a reset spring. The upper end of the guide post is fixed to the lower end face of the tamping plate, and the lower end of the guide post extends to the base. The reset spring is sleeved on the guide post. After the tamping plate is subjected to force, the guide post moves downward along the base, causing the piston to slide along the water suction pipe.

6. The horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 5, characterized in that: A limiting edge is provided around the opening of the tamping seat. When the tamping plate is in a state of no force, the tamping plate abuts against the limiting edge.

7. A construction method for a horizontal-vertical drainage board vacuum preloading combined with dynamic compaction soft soil treatment system according to claim 1, characterized in that: The steps are as follows: (1) Prepare multiple drainage boards in advance and lay a horizontal drainage board system. Slurry is pumped into the preloading tank. When the slurry level reaches a certain height, the first layer of horizontal drainage board system is laid horizontally. Each drainage board in the first layer of horizontal drainage board system is connected to the first vertical drainage pipe through a connector pipe. The outer end of the first vertical drainage pipe is connected to an external vacuum pump, and the system is immediately evacuated. At the same time, slurry continues to be pumped into the preloading tank. When the slurry reaches a certain height, the second layer of horizontal drainage board system is laid. The second layer of horizontal drainage board system is connected to the first vertical drainage pipe through a connector pipe, and the system is immediately evacuated. At the same time, slurry continues to be pumped into the preloading tank. The above operation is repeated until the last layer of horizontal drainage board system is laid. The first layer of sealing film is then sealed, and the system is evacuated again while slurry is pumped in. (2) Lay a vertical drainage board system. The mud is covered to halfway up the preloading trough. Multiple vertical drainage board systems are inserted into the upper layer of the preloading trough. The multiple vertical drainage board systems are arranged horizontally with equal spacing between adjacent vertical drainage board systems. The upper side of the vertically laid drainage board system is connected to the second vertical drainage pipe through a joint pipe. The second vertical drainage pipe is connected to an external vacuum pump. (3) Continue to transport mud to the top of the preloading tank, and lay a 0.5m thick sand cushion layer at the bottom of the mud, and immediately perform vacuuming; (4) A tamping water-collecting device is placed on the sand cushion layer. The hoisting device lifts the tamping hammer and the tamping hammer strikes the strong tamping point of the tamping water-collecting device. The strong tamping point applies a load to the mud. At the same time, the vacuum pump continuously draws a vacuum. The strong tamping hammer strikes and leaves repeatedly and alternately. The tamping water-collecting device draws the pore water generated at the top of the soil and collects it in the water storage area through the water suction pipe and discharges it through the drainage pipe.

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