Soft soil compressed air water collection and drainage foundation treatment device

Abstract

The utility model discloses a soft soil compressed air water collection and drainage foundation treatment device which comprises a gas diffusion cavity compressed air pipe, a water drainage compressed air pipe and a water drainage pipe, a water collection cavity, a water drainage cavity and a gas diffusion cavity are respectively embedded in a soft soil foundation, the water collection cavity is arranged on the periphery of the gas diffusion cavity, and the water drainage cavity is arranged on the periphery of the gas diffusion cavity. The gas diffusion cavity and the water collection cavity are flush in position and are both located above the water drainage cavity. The gas diffusion cavity is connected with a compressed air pipe, and the compressed air pipe extends out of the earth surface in the vertical direction of the soft soil foundation and communicates with an inflator pump; the drainage cavity is connected with the water collection cavity, a drainage compressed air pipe and a drainage pipe, and the drainage compressed air pipe extends out of the earth surface in the vertical direction of the soft soil foundation and communicates with an inflation pump. Through the arrangement of the air compression, water collection and drainage devices, high-efficiency drainage of the soft soil foundation in a large range can be achieved, the drainage consolidation time of the soft soil foundation is greatly shortened, the shear strength of a soil body is enhanced, and post-construction settlement of the soft soil foundation is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering technology, and in particular relates to a soft soil pressurized air collection and drainage foundation treatment device. Background Technology

[0002] Soft soil foundations are characterized by high natural water content, large void ratio, high compressibility, low permeability, and poor bearing capacity. When constructing buildings on soft soil foundations, engineering loads can easily lead to excessive settlement. Due to the low permeability of soft soil, the consolidation settlement process is lengthy, especially in projects with thick soft soil layers. Because groundwater in deep soft soil foundations has long drainage paths to the surface, natural drainage consolidation can take decades to centuries. Excessive post-construction settlement often affects the normal use of the project and can even cause engineering disasters. Currently used methods such as preloading and vacuum preloading are effective for drainage consolidation in shallow soft soils, but less effective in deep soft soils. Achieving drainage consolidation in deep soft soils requires long time and is costly. Drainage consolidation of deep soft soil layers has become a difficult point in the treatment of soft soil foundation drainage consolidation, especially for buildings that bear large areas of soil. Drainage consolidation of deep soft soil layers is particularly important, but existing deep soft soil consolidation treatments are too time-consuming and too expensive.

[0003] Patent application number 202122818003.4 discloses a porous deep compressed air drainage device for soft soil foundations suitable for buildings. It includes a compressed air pipe and a drainage pipe, with a drainage cavity and a gas diffusion cavity respectively disposed within the soft soil foundation. The drainage cavity is located around the gas diffusion cavity, enabling deep drainage of the soft soil foundation to a certain extent and shortening the consolidation time of deep soft soil foundation drainage. The drainage process involves two steps: first, gas escaping from the gas diffusion cavity drives water in the soil to flow into the drainage cavity; then, the seepage pressure of the water flow transfers pressure to the gas diffusion cavity, increasing the internal pressure of the drainage cavity, thereby indirectly achieving drainage. However, relying solely on the pressurized gas escaping from the gas diffusion cavity is insufficient to create the necessary pressure for drainage within the drainage cavity. Furthermore, due to the numerous permeable pipes on the sidewalls of the drainage cavity, direct drainage through the drainage cavity will cause some of the internal water to flow back into the soft soil foundation, resulting in low drainage efficiency. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a soft soil pressurized air collection and drainage foundation treatment device suitable for large-area bearing of soil in buildings. It is used to drain deep groundwater in soft soil foundations, thereby accelerating the drainage and consolidation of deep soft soil and reducing post-construction foundation settlement and deformation.

[0005] The purpose of this utility model is achieved through the following technical solution: a soft soil pressurized air collection and drainage foundation treatment device, which includes a gas diffusion cavity pressurized air pipe, a drainage pressurized air pipe, a drainage pipe, a water collection cavity, a drainage cavity, and a gas diffusion cavity; the water collection cavity, the drainage cavity, and the gas diffusion cavity are buried in the soft soil foundation.

[0006] At least four water collection cavities are provided and arranged in a square around the gas diffusion cavity. The gas diffusion cavity and the water collection cavity are at the same level and both are arranged above the drainage cavity.

[0007] The upper end face of the gas diffusion cavity is provided with a first connection port, and the gas diffusion cavity compressor pipe is connected through the first connection port. The gas diffusion cavity compressor pipe extends vertically along the soft soil foundation to the outside of the ground surface and is connected to the air pump.

[0008] The upper surface of the drainage cavity is provided with three second connection ports, which are respectively connected to the water collection cavity, the drainage air pipe and the drainage pipe. The drainage air pipe extends vertically along the soft soil foundation to the outside of the ground and is connected to the air pump. One end of the drainage pipe extends into the bottom of the drainage cavity, and the other end extends vertically along the soft soil foundation to the outside of the ground.

[0009] Furthermore, the outer diameter of the gas diffusion cavity is greater than or equal to the outer diameter of the water collection cavity.

[0010] Furthermore, the cross-sectional shape of the drainage cavity is an isosceles trapezoid, and the drainage pipe is located at the center of the axis of symmetry.

[0011] Furthermore, the ratio of the length to the outer diameter of the gas diffusion cavity and the water collection cavity is not less than 10, forming a long, cylindrical shape.

[0012] Furthermore, the vertical distance between the gas diffusion cavity and the surface of the soft soil foundation is greater than 5 times the outer diameter of the gas diffusion cavity, and the lateral distance between the gas diffusion cavity and the water collection cavity is 5 to 10 times the outer diameter of the gas diffusion cavity.

[0013] Furthermore, the gas diffusion cavity's compressed air pipe is divided into upper and lower parts. The upper part is a plastic flexible tube, and the lower part is a metal tube. Holes with a diameter of 2 mm are evenly opened along the depth direction of the tube wall, so that the gas pressure distribution inside the tube is uniform. The lower part extends into the interior of the gas diffusion cavity.

[0014] Furthermore, the drainage cavity is made of stainless steel.

[0015] Furthermore, the main body of the water collection cavity is made of stainless steel, and the side walls are uniformly perforated with holes of 2 mm in diameter. Geotextile is laid on the outside of the stainless steel body to filter soft soil particles.

[0016] The beneficial effects of this invention are as follows: By setting up air compression, water collection and drainage devices, this invention can achieve high-efficiency drainage over a large area of ​​soft soil foundation, greatly shorten the drainage consolidation time of soft soil foundation, enhance the shear strength of soil, and reduce post-construction settlement of soft soil foundation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the soft soil pressurized air collection and drainage foundation treatment device of this utility model.

[0018] Figure 2 yes Figure 1 Top view of the structural layout.

[0019] The labels in the attached diagram are as follows: 1. Air pump; 2. Drainage pipe; 3. Water collection cavity; 4. Drainage compressed air pipe; 5. Drainage cavity; 6. Gas diffusion cavity; 7. Gas diffusion cavity compressed air pipe; 8. Soft soil foundation. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the single embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] As attached Figure 1 and Figure 2 As shown. The present invention provides a soft soil pressurized air collection and drainage foundation treatment device, including a gas diffusion cavity pressurized air pipe 7, a drainage pressurized air pipe 4 and a drainage pipe 2, and a water collection cavity 3, a drainage cavity 5 and a gas diffusion cavity 6 respectively buried in the soft soil foundation 8;

[0022] At least four water collection cavities 3 and drainage cavities 5 are provided and arranged in a square pattern around the gas diffusion cavity 6, distributed at equal intervals around the radial periphery of the gas diffusion cavity 6. The gas diffusion cavity 6 is flush with the water collection cavity 3, and both are above the drainage cavity 5. The outer diameter of the gas diffusion cavity 6 is greater than or equal to the outer diameter of the water collection cavity 3. The ratio of the length to the outer diameter of the gas diffusion cavity 6 and the water collection cavity 3 is not less than 10, forming a long, columnar body, which reduces the requirements for drilling holes while increasing the depth of foundation treatment. The main body of the water collection cavity 3 is a stainless steel structure, with 2 mm holes evenly distributed throughout the sidewalls. Geotextile is laid on the outside of the stainless steel structure to filter soft soil particles.

[0023] The upper end face of the gas diffusion cavity 6 has a first connection port, through which the gas diffusion cavity compressor pipe 7 is connected. The gas diffusion cavity compressor pipe 7 extends vertically along the soft soil foundation 8 to the ground surface and is connected to the air pump 1. The gas diffusion cavity compressor pipe 7 is divided into upper and lower parts: the upper part is a plastic hose, and the lower part is a metal pipe. 2mm holes are evenly distributed along the depth direction of the pipe wall to ensure uniform air pressure distribution inside the pipe. The lower part extends deep into the gas diffusion cavity 6.

[0024] The vertical distance between the gas diffusion cavity 6 and the ground surface of the soft soil foundation 8 is greater than 5 times the outer diameter of the gas diffusion cavity 6, and the lateral distance between the gas diffusion cavity 6 and the water collection cavity 3 is 5 to 10 times the outer diameter of the gas diffusion cavity 6.

[0025] The drainage cavity 5 has an isosceles trapezoidal cross-sectional shape and is made of stainless steel. The drainage pipe 2 is located at the center of the axis of symmetry. Three second connection ports are simultaneously provided on the upper surface of the drainage cavity 5, which connect to the water collection cavity 3, the drainage compressed air pipe 4, and the drainage pipe 2, respectively. The drainage compressed air pipe 4 extends vertically along the soft soil foundation 8 to the surface and is connected to the air pump 1. The drainage compressed air pipe 4 and the gas diffusion cavity compressed air pipe 7 share the same air pump 1. One end of the drainage pipe 2 extends into the bottom of the drainage cavity 5, and the other end extends vertically along the soft soil foundation 8 to the surface.

[0026] By setting up the above-mentioned air compression, water collection and drainage devices, high-efficiency drainage can be achieved over a large area of ​​soft soil foundation, greatly shortening the drainage consolidation time of soft soil foundation, enhancing the shear strength of soil, and reducing post-construction settlement of soft soil foundation.

[0027] This invention provides a construction method for a porous deep compressed air drainage device for soft soil foundations. The construction method steps are as follows:

[0028] S1. According to the geological survey report, a deep hole is drilled on the soft soil foundation 8 to reach the bottom of the soft soil layer for burying the gas diffusion cavity 6. At least four deep holes are drilled within a range of 5 times the diameter around it for burying the water collection cavity 3 and the drainage cavity 5. Then, the gas diffusion cavity 6 with the compressed air pipe 7, the drainage cavity 5 with the compressed air pipe 4 and the drainage pipe 2, and the water collection cavity 3 are placed into the bottom of their respective deep holes, and the soil is filled into each deep hole until it is level with the surface of the soft soil foundation 8.

[0029] S2. The air pump 1 pressurizes the air pipe of the air pressure diffusion cavity, so that the gas diffusion cavity 6 forms a high pressure. The high pressure air then squeezes and diffuses into the surrounding soil, and drives the groundwater in the soil to flow along the direction of the maximum pressure gradient, that is, into the water collection cavity 3.

[0030] S3. After the air pump 1 completes an air inflation process, a certain volume of soft soil pore water will seep into the water collection cavity 3. Under the action of gravity, the pore water will flow into the drainage cavity 5 below. By switching the air pump's air valve, high-pressure gas is introduced into the drainage cavity, and the pore water is transported from the drainage pipe 2 to the surface water container under pressure.

[0031] S4. Repeat steps S2-S3 until no more water flows out of drain pipe 2.

[0032] This utility model is not limited to the above-described embodiments. Any changes made to its shape or material composition, as long as the structural design provided by this utility model is adopted, are considered a variation of this utility model and should be regarded as within the protection scope of this utility model.

Claims

1. A soft soil pressurized air collection and drainage foundation treatment device, characterized in that: The device includes a gas diffusion cavity compressed air pipe (7), a drainage compressed air pipe (4), a drainage pipe (2), a water collection cavity (3), a drainage cavity (5), and a gas diffusion cavity (6); the water collection cavity (3), the drainage cavity (5), and the gas diffusion cavity (6) are buried in a soft soil foundation (8); At least four water collection cavities (3) are provided and arranged in a square around the gas diffusion cavity (6). The gas diffusion cavity (6) and the water collection cavity (3) are at the same level, and both are arranged above the drainage cavity (5). The upper end face of the gas diffusion cavity (6) is provided with a first connection port, and the gas diffusion cavity compressor pipe (7) is connected through the first connection port. The gas diffusion cavity compressor pipe (7) extends vertically along the soft soil foundation (8) to the outside of the ground and is connected to the air pump (1). The upper end face of the drainage cavity (5) is provided with three second connection ports, which are respectively connected to the water collection cavity (3), the drainage air pipe (4) and the drainage pipe (2). The drainage air pipe (4) extends vertically along the soft soil foundation (8) to the outside of the ground and is connected to the air pump (1). One end of the drainage pipe (2) extends into the bottom of the drainage cavity (5), and the other end extends vertically along the soft soil foundation (8) to the outside of the ground.

2. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The outer diameter of the gas diffusion cavity (6) is greater than or equal to the outer diameter of the water collection cavity (3).

3. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The cross-sectional shape of the drainage cavity (5) is an isosceles trapezoid, and the drainage pipe (2) is located at the center of the axis of symmetry.

4. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The ratio of the length to the outer diameter of the gas diffusion cavity (6) and the water collection cavity (3) is not less than 10, forming a long columnar body.

5. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The vertical distance between the gas diffusion cavity (6) and the surface of the soft soil foundation (8) is greater than 5 times the outer diameter of the gas diffusion cavity (6), and the lateral distance between the gas diffusion cavity (6) and the water collection cavity (3) is 5 to 10 times the outer diameter of the gas diffusion cavity (6).

6. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The gas diffusion cavity compressed air pipe (7) is divided into upper and lower parts. The upper part is a plastic hose and the lower part is a metal pipe. Holes with a diameter of 2 mm are evenly opened in the pipe wall along the depth direction, so that the gas pressure distribution inside the pipe is uniform. The lower part extends into the gas diffusion cavity (6).

7. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The drainage cavity (5) is made of stainless steel.

8. The soft soil compressed air collection and drainage foundation treatment device according to claim 1, characterized in that: The main body of the water collection cavity (3) is made of stainless steel, and the side walls are uniformly perforated with holes of 2 mm in diameter. Geotextile is laid on the outside of the stainless steel body to filter soft soil particles.

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