CN-116591142-B - Vacuum preloading soft soil foundation reinforcing device and method for floating raft type cushion layer

CN116591142BCN 116591142 BCN116591142 BCN 116591142BCN-116591142-B

Abstract

The invention relates to a vacuum preloading soft soil foundation reinforcing device and a method thereof of a floating raft type cushion layer, wherein the reinforcing device comprises a sealing wall which is enclosed around the soft soil foundation, the soft soil foundation in the sealing wall is covered with the floating raft type cushion layer, a drain board is arranged below the floating raft type cushion layer, the drain board is vertically inserted into the soft soil foundation, the upper end of the drain board penetrates into the floating raft type cushion layer, a vacuum sealing film is covered on the floating raft type cushion layer, the floating raft type cushion layer is externally connected with a vacuum loading system, and the vacuum loading system is used for generating vacuum negative pressure in the floating raft type cushion layer so as to suck and discharge water of the soft soil foundation through the drain board. This reinforcing apparatus can carry out construction operation at general weak soil foundation, super soft soil foundation and suspension silt foundation, and the work progress need not to pile and presses a large amount of sand bed course, need not to handle a large amount of sand resources of saving, and the pre-compaction is effectual, and construction cycle is short efficient, and the buoyant raft formula bed course repeatedly usable, can not destroy or pollute the environment, has both reduced construction cost, has effectively protected the environment again.

Inventors

FANG YINGGUANG
DONG ZHILIANG
GU RENGUO
CHEN PINGSHAN
WANG JING
XIE YAO

Assignees

华南理工大学
中交四航工程研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20230308

Claims (8)

1. The vacuum preloading soft soil foundation reinforcing device of the floating raft type cushion layer is characterized by comprising sealing walls which are built around the soft soil foundation, wherein the soft soil foundation in the sealing walls is covered with the floating raft type cushion layer, a drain board is arranged below the floating raft type cushion layer, the drain board is vertically inserted into the soft soil foundation and the upper end of the drain board penetrates into the floating raft type cushion layer, a vacuum sealing film is covered on the floating raft type cushion layer, the floating raft type cushion layer is externally connected with a vacuum loading system, and the vacuum loading system is used for generating vacuum negative pressure in the floating raft type cushion layer so as to absorb and drain water of the soft soil foundation through the drain board; The floating raft type cushion comprises a top plate, a bottom plate and side plates which are arranged in the sealing wall in a surrounding mode, wherein the upper end and the lower end of the side plates are respectively connected with the top plate and the bottom plate, the bottom plate is covered on a soft soil foundation, a vacuum sealing film is covered on the top plate, a space formed by surrounding the side plates, the top plate and the bottom plate is filled with geotechnical filter materials, a drain plate is arranged on the bottom plate in a penetrating mode, and the upper end of the drain plate is located between the top plate and the bottom plate; the periphery of curb plate is equipped with the sand bed course, and the sand bed course is located between roof and the bottom plate, and sand bed course highly suits with the floating raft bed course.
2. The device for reinforcing the vacuum preloading soft soil foundation of the floating raft type cushion according to claim 1, wherein the cushion filter screen is stuck to the bottom of the bottom plate, and the drain plate is arranged on the cushion filter screen in a penetrating manner.
3. The device for reinforcing the vacuum preloading soft soil foundation of the floating raft type cushion according to claim 1, wherein the bottom plate is provided with flares with the cross sections gradually increasing from top to bottom, and the minimum outer diameter of each of the flares is matched with the outer diameter of the drain plate.
4. The device for reinforcing the vacuum preloading soft soil foundation of the floating raft type cushion according to claim 1, wherein a plurality of partition plates are arranged between the top plate and the bottom plate, the upper end and the lower end of each partition plate are respectively connected with the top plate and the bottom plate, the left end and the right end of each partition plate are respectively connected with the side plates, the plurality of partition plates are crisscrossed to form a plurality of grids, and the geotechnical filter material is respectively arranged in the grids.
5. The device for reinforcing a vacuum preloading soft soil foundation of a floating raft type cushion according to claim 4, wherein the bottom plate and the partition plate are provided with a plurality of through holes at intervals.
6. The device for reinforcing the vacuum preloading soft soil foundation of the floating raft cushion according to claim 4, wherein the vacuum loading system is provided with a plurality of vacuum pipes, and the vacuum pipes penetrate through the vacuum sealing film and are respectively connected with the grids in a one-to-one correspondence manner.
7. A method for reinforcing a vacuum preloading soft soil foundation of a floating raft type mat, characterized in that a vacuum preloading soft soil foundation reinforcing apparatus of a floating raft type mat according to any one of claims 1 to 6 is adopted, comprising the steps of: Building a sealing wall around the soft soil foundation, arranging a floating raft type cushion layer on the soft soil foundation in the sealing wall, arranging a drain plate below the floating raft type cushion layer, vertically inserting the drain plate into the soft soil foundation and enabling the upper end of the drain plate to penetrate into the floating raft type cushion layer, covering a vacuum sealing film on the floating raft type cushion layer, and generating vacuum negative pressure in the floating raft type cushion layer by utilizing a vacuum loading system so as to absorb and discharge water of the soft soil foundation through the drain plate and the floating raft type cushion layer.
8. The method for reinforcing a vacuum preloading soft soil foundation of a floating raft type bed according to claim 7, wherein a sand bed is arranged between a top plate and a bottom plate at the periphery of the side plate, and the concave deformation generated by the vacuum pressure acting on the side plate of the floating raft type bed is eliminated by utilizing the friction force between the sand bed and the bottom plate.

Description

Vacuum preloading soft soil foundation reinforcing device and method for floating raft type cushion layer Technical Field The invention relates to the technical field of soft soil foundation reinforcement, in particular to a vacuum preloading soft soil foundation reinforcement device and a method thereof for a floating raft type cushion layer. Background Soft soil is fine-grained soil deposited on coasts, lakes, valleys and beaches and has the characteristics of high natural water content, large pore ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, large disturbance, poor water permeability, complex layered distribution of soil layers, large physical and mechanical property difference among layers and the like. Soft soil foundations are soft soil layers with low strength and high compression amount, and most soft soil layers contain certain organic substances. Because the soft soil has low strength and large sinking amount, the road engineering is often greatly endangered, for example, the construction and the use are greatly influenced by improper treatment. The conventional soft soil foundation treatment method includes a vacuum preloading method. The vacuum pre-pressing method is to set sand well or plastic draining board inside soft soil foundation to be reinforced, then to lay sand cushion layer on the ground to isolate the soft soil foundation from atmosphere and to exhaust air via water sucking pipe embedded in the sand cushion layer with vacuum device. The method does not need stacking, omits loading and unloading procedures, shortens pre-pressing time, omits a large amount of stacking materials, has simple equipment and construction process, does not need a large amount of large-scale equipment, and is convenient for large-area construction. The technical problems are as follows: the sand cushion is used for vacuum preloading, so that the requirement on the soft soil foundation is higher, the vacuum preloading can only be applied to a general soft soil foundation, the vacuum preloading cannot be applied to an ultra-soft soil foundation or a suspended silt foundation, sand layering fracture is easily caused by uneven settlement, multiple treatments are needed, the construction efficiency is lower, meanwhile, when the area of the soft soil foundation is enlarged, the required sand amount of the sand cushion can be multiplied, the implementation cost of the vacuum preloading is higher and higher due to shortage of sand resources, the vacuum preloading cannot be recycled and reused, and large waste is caused. Disclosure of Invention Aiming at the problems existing in the prior art, one of the purposes of the invention is to provide a vacuum preloading soft soil foundation reinforcing device of a floating raft type cushion layer, which can adapt to the construction environment of ultra-soft soil or a suspended silt foundation, can finish reinforcement without multiple treatments, can be reused, reduces the construction cost and improves the construction efficiency. The second purpose of the invention is to provide a method for reinforcing the vacuum preloading soft soil foundation of the floating raft type cushion. In order to achieve the above purpose, the invention adopts the following technical scheme: The utility model provides a vacuum preloading soft soil foundation reinforcing apparatus of floating raft formula bed course, including enclosing the sealing wall of building around soft soil foundation, the soft soil foundation is covered with the floating raft formula bed course in the sealing wall, floating raft formula bed course below is equipped with the drain bar, the drain bar is vertical to be inserted in soft soil foundation and upper end penetration floating raft formula bed course, the floating raft formula bed course is covered with the vacuum seal membrane, the external vacuum loading system that has of floating raft formula bed course, the vacuum loading system is used for producing vacuum negative pressure in floating raft formula bed course, in order to inhale the water of discharging soft soil foundation through the drain bar. Further, the floating raft type cushion layer comprises a top plate, a bottom plate and a side plate which is arranged in the sealing wall in a surrounding mode, the upper end and the lower end of the side plate are respectively connected with the top plate and the bottom plate, the bottom plate is covered on the soft soil foundation, the vacuum sealing film is covered on the top plate, the space formed by surrounding the side plate, the top plate and the bottom plate is filled with geotechnical filter materials, and the drain plate is arranged on the bottom plate in a penetrating mode and the upper end of the drain plate is located between the top plate and the bottom plate. Further, a cushion filter screen is stuck to the bottom of the bottom plate, and the drain board is penetrated t