WO2022151807A1

WO2022151807A1 - Interactive vacuum preloading device and method for consolidating soft soil and dewatering

Info

Publication number: WO2022151807A1
Application number: PCT/CN2021/127842
Authority: WO
Inventors: 金亚伟; 郑明明; 王军; 蒋君南; 王敏超; 钱明; 王小东; 蒋楚生; 黄献璋; 贺钢; 邹川; 曾惜
Original assignee: 江苏鑫泰岩土科技有限公司
Priority date: 2021-01-18
Filing date: 2021-11-01
Publication date: 2022-07-21
Also published as: JP2023517780A; CN112878308A; CN112878308B

Abstract

The present invention belongs to the technical field of soft soil foundations. Provided is an interactive vacuum preloading device and method for consolidating soft soil and dewatering. Said device comprises an ultra-low water-level dewatering pressurization pipe and a drainage assembly; a core pipe is inserted into the upper portion of a soil mass, the upper end portion of a super core pipe extends above the soil mass and is in communication with a gas-liquid separation tank by means of a pipeline, and a vacuum device is connected to the gas-liquid separation tank; the drainage assembly comprises a filter membrane, the filter membrane is inserted into the soil mass, and the lower end portion of the filter membrane extends to the lower portion of the soil mass. First, water is pumped out from the upper portion of the soil mass by means of the ultra-low water-level dewatering pressurization pipe, the soil in the upper portion of the soil mass is changed from a buoyant unit weight to a wet unit weight, the soil in the upper portion of the soil mass forms a load on the soil in the lower portion, the soil in the lower portion is subjected to pressure of the soil in the upper portion, and under the pumping effect of the drainage assembly, the water in the lower portion of the soil mass is more easily pumped to the upper portion, and water is more completely pumped; and then water is discharged from the upper portion of the soil mass by means of the ultra-low water-level dewatering pressurization pipe. Thus, the consolidation of a whole soft soil layer is completed, greatly improving the consolidation strength of a soil mass.

Description

An interactive vacuum pre-compression soft soil consolidation dewatering device and method

technical field

The invention belongs to the technical field of soft soil foundations, and relates to an interactive vacuum precompression soft soil consolidation and dewatering device and method.

Background technique

In the process of river and lake silt consolidation treatment, sea reclamation and soft foundation treatment, in order to make silt with extremely high water content to be quickly drained and consolidated, vacuum pre-compression consolidation construction technology is usually used. It is necessary to set up interphase drainage plates (for example, 80-120cm between each other) in the sludge, and by applying negative drainage pressure to the drainage plate, the water in the sludge can be quickly drained, so as to realize the rapid consolidation of the sludge. However, the consolidation strength of the middle and lower layers of silt in this method is not good, which will bring some problems in the later stage, such as low strength, easy to collapse, and relatively large post-construction settlement. In addition, the traditional consolidation technology often carries a large amount of sludge when pumping, which is very likely to cause pipeline blockage and affect the service life of the equipment.

technical solutions

Aiming at the above problems existing in the prior art, the present invention provides an interactive vacuum pre-compression soft soil consolidation and dewatering method. The technical problem to be solved by the present invention is: how to improve the consolidation strength of the soft soil layer.

The object of the present invention can be realized through the following technical solutions:

S1. Vacuum precipitation through the ultra-low water level precipitation booster pipe inserted into the soil to reduce the water level to -15~-3 meters;

S2. Then, the water is pumped to the upper part of the soil body through the drainage component inserted into the soil body, and the drainage component is evacuated to raise the water level to -3~-1.5 meters, and then the vacuuming is stopped;

S3. Steps S1 and S2 are completed when the soil strength reaches hard plastic, and the deep silt consolidation is completed.

Specifically, in step S1, insert the core tube of the ultra-low water level precipitation booster tube into the upper part of the soil body, connect the core tube and the gas-liquid separation tank, connect the gas-liquid separation tank and the vacuum device, start the vacuum device, and extract the upper part of the soil body of water.

Specifically, in step S2, the filter membrane of the drainage assembly is inserted into the soil body, the lower end of the filter membrane extends to the lower part of the soil body, the upper end of the filter membrane is connected to the drainage pipe of the drainage assembly, the drainage pipe and the vacuum device are connected, and the startup is started. The vacuum device extracts the water from the lower part of the soil body to the upper part of the soil body.

Another object of the present invention is to provide an interactive vacuum pre-compressed soft soil consolidation dewatering device, the device comprising:

Ultra-low water level precipitation booster pipe, the ultra-low water level precipitation booster pipe includes a core pipe, a filter pipe, a gas-liquid separation tank and a vacuum device, the core pipe is inserted in the upper part of the soil body, and the filter pipe is covered In the lower part of the core tube, the upper end of the ultra-core tube extends above the soil body, and is communicated with the gas-liquid separation tank through a pipeline, and the vacuum device is connected with the gas-liquid separation tank;

The drainage assembly includes a filter membrane, the filter membrane is inserted into the soil body, and the lower end of the filter membrane extends to the lower part of the soil body.

In the above-mentioned interactive vacuum pre-pressed soft soil consolidation dewatering device, the bottom of the core tube is provided with a water inlet, and the filter tube covers the water inlet.

In the above-mentioned interactive vacuum pre-pressed soft soil consolidation dewatering device, the filter tube includes a skeleton, a filter mesh cloth and a protective shell, the skeleton is arranged on the outer side of the lower part of the core tube, and the filter mesh The cloth is covered on the outer side of the skeleton, a number of through holes are arranged in the skeleton, the protective shell is arranged on the outer side of the lower part of the skeleton, and a conical cavity is arranged in the protective shell, and the conical cavity is arranged in the protective shell. communicated with the water inlet.

In the above-mentioned interactive vacuum pre-compressed soft soil consolidation dewatering device, the lower part of the protective shell is arranged in a cone shape.

In the above-mentioned interactive vacuum pre-pressed soft soil consolidation dewatering device, the drainage assembly further includes a drainage pipe and a vacuum device, the two side walls of the drainage pipe are provided with sockets, and the upper end of the filter membrane is provided with sockets. The socket is inserted into the drainage pipe, the drainage pipe communicates with the pores of the filter membrane, the drainage pipe communicates with the vacuum device, and the filter membrane and the drainage pipe are arranged in a cross shape.

In the above-mentioned interactive vacuum pre-compression soft soil consolidation dewatering device, the vacuum device is a vacuum pump.

In the above-mentioned interactive vacuum pre-pressed soft soil consolidation dewatering device, a vertical shaft is provided on the soil body, and the gas-liquid separation tank is placed in the vertical shaft.

beneficial effect

In this interactive vacuum pre-pressed soft soil consolidation and precipitation method, the water in the upper part of the soil body is first pumped out through the ultra-low water level dewatering booster pipe, and the soil on the upper part of the soil body is changed from floating bulk density to wet bulk density, and the soil on the upper part of the soil body is A load is formed on the lower soil, the lower soil is under the pressure of the upper soil, and under the suction effect of the drainage component, the water in the lower soil is more easily drawn to the upper part, and the water is more completely pumped, and then passes through the ultra-low water level The precipitation booster pipe drains the water in the upper part of the soil body, completes the consolidation of the entire soft soil layer, and greatly improves the consolidation strength of the soil body.

Description of drawings

Fig. 1 is the structural schematic diagram of the interactive vacuum pre-compressed soft soil consolidation dewatering device;

Figure 2 is a schematic diagram of an ultra-low water level precipitation booster pipe;

Figure 3 is a schematic diagram of a drainage assembly;

Figure 4 is a flow chart of the interactive vacuum precompressed soft soil consolidation dewatering method.

In the figure, 1. ultra-low water level precipitation booster pipe; 2. core pipe; 2.1, water inlet; 3. filter pipe; 3.1, skeleton; 3.11, through hole; 3.2, filter mesh; 3.3, protective shell; Conical cavity; 4. Pipeline; 5. Gas-liquid separation tank; 6. Vacuum device; 7. Soil body; 8. Shaft; 9. Drainage assembly; 9.1, Drainage pipe; 9.2, Socket; 9.3, filter membrane

Embodiments of the present invention

The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "top", "inside", etc. is based on The orientation or positional relationship shown in the drawings is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as Limitations of the present invention.

The terms "first", "second" and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, a feature defined as "first", "second", "third" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a group" means two or more.

As shown in Figure 4, the interactive vacuum precompression soft soil consolidation and dewatering method includes the following steps:

S1. Vacuum precipitation through the ultra-low water level precipitation booster pipe 1 inserted into the soil body 7 to reduce the water level to -15~-3 meters; insert the core tube 2 of the ultra-low water level precipitation booster pipe 1 into the soil body 7 In the upper part, the core pipe 2 and the gas-liquid separation tank 5 are connected, the gas-liquid separation tank 5 and the vacuum device 6 are connected, the vacuum device 6 is activated, and the water in the upper part of the soil body 7 is extracted.

S2, and then pump the water to the upper part of the soil body 7 through the drainage component 9 inserted into the soil body 7, and the drainage component 9 is evacuated to raise the water level to -3~-1.5 meters, and then stop vacuuming; The filter membrane 9.3 is inserted into the soil body 7, the lower end of the filter membrane 9.3 extends to the lower part of the soil body 7, the upper end of the filter membrane 9.3 is connected to the drain pipe 9.1 of the drainage assembly 9, the drain pipe 9.1 and the vacuum device 6 are connected, and the vacuum device is activated 6. Pump the water from the lower part of the soil body 7 to the upper part of the soil body 7 .

S3. Steps S1 and S2 are completed when the strength of the soil body 7 reaches hard plastic, and the deep silt consolidation is completed.

In this interactive vacuum precompressed soft soil consolidation and precipitation method, the water in the upper part of the soil body 7 is first pumped out through the ultra-low water level dewatering booster pipe 1, and the soil on the upper part of the soil body 7 is changed from floating bulk density to wet bulk density. 7. The soil in the upper part forms a load on the soil in the lower part, the lower soil is under the pressure of the upper soil, and under the suction effect of the drainage assembly 9, the water in the lower soil body 7 is more easily sucked to the upper part, and the water suction is more complete Then, the water in the upper part of the soil body 7 is drained through the ultra-low water level dewatering booster pipe 1 to complete the consolidation of the entire soft soil layer, which greatly improves the consolidation strength of the soil body 7 .

As shown in Figs. 1-3, another object of the present invention is to provide an interactive vacuum pre-pressed soft soil consolidation dewatering device, the device includes an ultra-low water level dewatering booster pipe 1 and a drainage assembly 9, the ultra-low water level dewatering The low water level precipitation booster pipe 1 includes a core pipe 2, a filter pipe 3, a gas-liquid separation tank 5 and a vacuum device 6, the core pipe 2 is inserted in the upper part of the soil body 7, and the filter pipe 3 is covered on the The lower part of the core tube 2, the upper end of the super core tube 2 extends to the top of the soil body 7, and is communicated with the gas-liquid separation tank 5 through the pipeline 4, and the vacuum device 6 is in phase with the gas-liquid separation tank 5. Connection; the drainage assembly 9 includes a filter membrane 9.3, the filter membrane 9.3 is inserted in the soil body 7, and the lower end of the filter membrane 9.3 extends to the lower part of the soil body 7.

It should be noted that the filter membrane 9.3 is a product independently developed by the applicant. For details, please refer to the Chinese invention patent CN101614006A applied for by the applicant, that is, the filter membrane 9.3 is the drainage plate in the Chinese invention patent CN101614006A. The structure of the filter membrane 9.3 The upper part of the soil body 7 is -3~0 meters of the soil body 7, and the lower part of the soil body 7 is -15~-3 meters of the soil body 7.

In this embodiment, as shown in FIG. 2 , two sets of ultra-low water level precipitation booster pipes 1 and one set of drainage components 9 are provided. In other embodiments, multiple sets of ultra-low water level precipitation booster pipes 1 and multiple Sets of drainage components 9, multiple sets of ultra-low water level precipitation booster pipes 1 and multiple sets of drainage components 9 can simultaneously drain water to improve pumping efficiency, thereby improving the consolidation efficiency of soft soil layers, ultra-low water level precipitation booster pipes 1 and drainage components 9 The number is not limited.

In this interactive vacuum pre-pressed soft soil consolidation and dewatering device, the core tube 2 is inserted into the upper part of the soil body 7, and the filter tube 3 is covered at the lower part of the core tube 2. The filter tube 3 can effectively prevent sand and soil from entering the core tube 2. Avoid blocking the core tube 2; the upper end of the core tube 2 extends to the top of the soil body 7 and communicates with the gas-liquid separation tank 5 through the pipeline 4, and the first air device is connected with the gas-liquid separation tank 5, start the device, and gas-liquid separation The tank 5 forms a negative pressure, and the water in the upper part of the soil body 7 enters the gas-liquid separation tank 5 along the core pipe 2 under the action of the pressure difference, so as to realize the extraction of the water in the upper part of the soil body 7; the filter membrane 9.3 is inserted into the soil body 7, the lower end of the filter membrane 9.3 extends to the lower part of the soil body 7, the water in the lower part of the soil body 7 is under the action of the upper pressure of the soil body 7 and the capillary phenomenon of the filter membrane 9.3, along the drainage membrane 9.3 from the lower part of the soil body 7. Lifted to the upper part of the soil body 7, at this time, the water lifted from the lower part of the soil body 7 to the upper part of the soil body 7 is pumped to the gas-liquid separation tank 5 through the ultra-low water level dewatering booster pipe 1 to complete a cycle of pumping, and repeat the above-mentioned supercharging process. The low water level precipitation booster pipe 1 and the drainage assembly 9 pump water to complete the consolidation of the entire soft soil layer. The interactive vacuum pre-pressed soft soil consolidation and dewatering device first pumped out the water in the upper part of the soil body 7 through the ultra-low water level dewatering booster pipe 1, and changed the soil in the upper part of the soil body 7 from the floating bulk density to the wet bulk density, and the upper part of the soil body 7 The lower soil forms a load on the lower soil, the lower soil is under the pressure of the upper soil, and under the suction effect of the drainage assembly 9, the water in the lower soil body 7 is more easily sucked to the upper part, and the water suction is more complete, and then Then, the water in the upper part of the soil body 7 is drained through the ultra-low water level precipitation booster pipe 1 to complete the consolidation of the entire soft soil layer, which greatly improves the consolidation strength of the soil body 7 .

As shown in Figures 1 and 2, in this embodiment, the bottom of the core tube 2 is provided with a water inlet 2.1, and the filter tube 3 covers the water inlet 2.1. Specifically, the filter tube 3 includes a frame 3.1, a filter cloth 3.2 and a protective shell 3.3, the frame 3.1 is arranged on the outer side of the lower part of the core tube 2, and the filter cloth 3.2 is wrapped around the frame On the outer side of 3.1, a number of through holes 3.11 are arranged in the skeleton 3.1, the protective shell 3.3 is arranged on the outer side of the lower part of the skeleton 3.1, and a conical cavity 3.31 is arranged in the protective shell 3.3, and the conical cavity 3.31 is communicated with the water inlet 2.1. In this structure, the skeleton 3.1 is arranged on the outer side of the lower part of the core tube 2, a number of through holes 3.11 are arranged in the skeleton 3.1, the filter cloth 3.2 is covered on the outer side of the skeleton 3.1, and the filter screen prevents sediment from entering the core tube 2, To ensure the service life of the core tube 2; the protective shell 3.3 is arranged on the outer side of the skeleton 3.1, the protective shell 3.3 is provided with a conical cavity 3.31, and the conical cavity 3.31 is communicated with the water inlet 2.1. When the water in the upper part of the soil body 7 is extracted , the water passes through the filter cloth 3.2, the filter cloth 3.2 can effectively isolate the sand and soil to avoid clogging, and the water passing through the filter cloth 3.2 enters the conical cavity 3.31 of the protective shell 3.3 along the through holes 3.11 of the skeleton 3.1. The conical cavity 3.31 is communicated with the water inlet 2.1. Under the action of negative pressure, the water in the conical cavity 3.31 enters the core tube 2 from the water inlet 2.1, and is then pumped into the gas-liquid separation tank 5 through the core tube 2 to realize Extraction of water from the upper part of the soil mass 7 .

As shown in FIG. 2 , in this embodiment, the lower end of the protective shell 3.3 is arranged in a tapered shape. In this structure, the lower end of the protective shell 3.3 is arranged in a tapered shape, and when inserted into the soil body 7, the protective shell 3.3 arranged in a tapered shape can be easily inserted into the soil body 7.

As shown in Figures 1 and 3, in this embodiment, the drainage assembly 9 further includes a drainage pipe 9.1 and a vacuum device 6, the drainage pipe 9.1 is provided with sockets on both sides, and the upper end of the filter membrane 9.3 passes through the sockets Plugged into the drain pipe 9.1, the drain pipe 9.1 is communicated with the pores of the filter membrane 9.3, the drain pipe 9.1 is communicated with the vacuum device 6, and the filter membrane 9.3 is in the shape of the drain pipe 9.1. Cross shape set. In this structure, the upper end of the filter membrane 9.3 is inserted into the drain pipe 9.1 through the socket, the drain pipe 9.1 is connected with the pores of the filter membrane 9.3, and the drain pipe 9.1 is connected with the vacuum device 6. By starting the vacuum device 6, a negative pressure is formed , to further accelerate the suction of the water in the lower part of the soil body 7 to the upper part of the soil body 7, and improve the consolidation efficiency of the soft soil layer.

As shown in FIG. 1 , in this embodiment, the vacuum device 6 is a vacuum pump. In other embodiments, the vacuum device 6 may also be other vacuum-pumpable equipment, which is not limited herein.

As shown in FIG. 1 , in this embodiment, a vertical shaft 8 is provided on the soil body 7 , and the gas-liquid separation tank 5 is placed in the vertical shaft 8 . In this structure, the soil body 7 is provided with a vertical shaft 8, and the gas-liquid separation tank 5 is placed in the vertical shaft 8, which can reduce the height of the gas-liquid separation tank 5, accelerate the pumping speed of the upper part of the soil body 7, and improve the consolidation efficiency of the soft soil layer.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims

An interactive vacuum pre-compressed soft soil consolidation dewatering method, characterized in that the method comprises the following steps:

S1. Through the ultra-low water level precipitation booster pipe (1) inserted into the soil body (7), the water level is reduced to -15~-3 meters by vacuuming and precipitation;

S2. Then, the water is pumped to the upper part of the soil body (7) through the drainage component (9) inserted into the soil body (7), and the drainage component (9) is evacuated to raise the water level to -3~-1.5 meters. Stop vacuuming;

S3. Steps S1 and S2 are completed when the strength of the soil body (7) reaches hard plastic, and the deep silt consolidation is completed.
An interactive vacuum pre-pressed soft soil consolidation dewatering method according to claim 1, characterized in that, in step S1, the core pipe (2) of the ultra-low water level precipitation booster pipe (1) is inserted into the soil body The upper part of (7), connect the core pipe (2) and the gas-liquid separation tank (5), connect the gas-liquid separation tank (5) and the vacuum device (6), start the vacuum device (6), and extract the upper part of the soil (7). water.
An interactive vacuum precompressed soft soil consolidation dewatering method according to claim 1, characterized in that, in step S2, the filter membrane (9.3) of the drainage assembly (9) is inserted into the soil body (7), The lower end of the filter membrane (9.3) extends to the lower part of the soil body (7), and the upper end of the filter membrane (9.3) is connected to the drainage pipe (9.1) of the drainage assembly (9), and is connected to the drainage pipe (9.1) and the vacuum device (6). ), start the vacuum device (6), and extract the water from the lower part of the soil body (7) to the upper part of the soil body (7).
An interactive vacuum pre-compressed soft soil consolidation dewatering device, characterized in that it includes:

An ultra-low water level precipitation booster pipe (1), the ultra-low water level precipitation booster pipe (1) comprises a core pipe (2), a filter pipe (3), a gas-liquid separation tank (5) and a vacuum device (6), The core tube (2) is inserted into the upper part of the soil body (7), the filter tube (3) is wrapped around the lower part of the core tube (2), and the upper end of the super core tube (2) extends to Above the soil body (7), and communicated with the gas-liquid separation tank (5) through a pipeline (4), and the vacuum device (6) is connected with the gas-liquid separation tank (5);

Drainage assembly (9), the drainage assembly (9) includes a filter membrane (9.3), the filter membrane (9.3) is inserted in the soil body (7), and the lower end of the filter membrane (9.3) extends to the soil the lower part of the body (7).
An interactive vacuum pre-pressed soft soil consolidation dewatering device according to claim 4, characterized in that, the bottom of the core tube (2) is provided with a water inlet (2.1), and the filter tube (3) contains Cover the water inlet (2.1).
The interactive vacuum pre-pressed soft soil consolidation dewatering device according to claim 5, wherein the filter tube (3) comprises a frame (3.1), a filter cloth (3.2) and a protective shell (3.3) , the skeleton (3.1) is arranged on the outer side of the lower part of the core tube (2), the filter cloth (3.2) is covered on the outer side of the skeleton (3.1), and the skeleton (3.1) is arranged inside There are several through holes (3.11), the protective shell (3.3) is arranged on the outer side of the lower part of the skeleton (3.1), the protective shell (3.3) is provided with a conical cavity (3.31), the conical cavity ( 3.31) is communicated with the water inlet (2.1).
The interactive vacuum pre-pressed soft soil consolidation dewatering device according to claim 6, characterized in that, the lower part of the protective shell (3.3) is arranged in a conical shape.
An interactive vacuum pre-compressed soft soil consolidation dewatering device according to claim 4, characterized in that, the drainage assembly (9) further comprises a drainage pipe (9.1) and a vacuum device (6), the drainage pipe (9.1) Both side walls of (9.1) are provided with sockets, and the upper end of the filter membrane (9.3) is inserted into the drain pipe (9.1) through the socket, and the drain pipe (9.1) is connected to the filter membrane (9.3). ) are communicated with each other, the drainage pipe (9.1) is communicated with the vacuum device (6), and the filter membrane (9.3) and the drainage pipe (9.1) are arranged in a cross shape.
The interactive vacuum pre-compressed soft soil consolidation and precipitation device according to claim 8, wherein the vacuum device (6) is a vacuum pump.
An interactive vacuum pre-pressed soft soil consolidation dewatering device according to claim 4, characterized in that, a shaft (8) is arranged on the soil body (7), and the gas-liquid separation tank (5) is placed on the soil body (7). in the shaft (8).