CN112878308B

CN112878308B - High-load ultralow-position precipitation vacuum preloading method

Info

Publication number: CN112878308B
Application number: CN202110060985.7A
Authority: CN
Inventors: 郑明明; 王敏超; 钱明; 王小东; 金亚伟; 王军; 金亚军; 蒋君南; 金亚明
Original assignee: Xintai Geotextile Material Co ltd
Current assignee: Xintai Geotextile Material Co ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2022-07-22
Anticipated expiration: 2041-01-18
Also published as: CN112878308A; JP2023517780A; WO2022151807A1

Abstract

The invention discloses a high-load ultra-low-level dewatering vacuum preloading method, which comprises the steps of firstly vacuumizing and dewatering through an ultra-low water level dewatering pressurization pipe inserted into soil body to reduce the water level to-15 to-3 meters; pumping water to the upper part of the soil body through a drainage assembly inserted into the soil body, vacuumizing the drainage assembly, and stopping vacuumizing when the water level rises to-3 to-1.5 meters; and continuously repeating the steps until the soil strength is hard and plastic, and finishing deep sludge consolidation. According to the invention, water on the upper part of the soil body is pumped out and then is vacuumized through the drainage assembly, soil on the upper part of the soil body is changed into wet volume weight from floating volume weight, load is formed on the soil body below, the lower soil body is under the pressure of the soil on the upper part and the suction force of the drainage assembly, water in the soil body on the lower part is easier to be sucked to the upper part, and then the water is discharged through the ultra-low water level precipitation pressurization pipe, so that the consolidation strength of the soil body on the lower part is improved.

Description

High-load ultralow-position precipitation vacuum preloading method

Technical Field

The invention relates to the field of soft soil foundation treatment, in particular to a high-load ultralow-position precipitation vacuum preloading method.

Background

In the process of river and lake sludge consolidation, and the process of surrounding sea reclamation and soft foundation treatment, in order to quickly drain and consolidate sludge with extremely high water content, a vacuum preloading consolidation construction technology is usually adopted, alternate drainage plates (for example, 80-120cm in interval) need to be arranged in the sludge in the consolidation construction, and drainage negative pressure is applied to the drainage plates, so that moisture in the sludge can be quickly removed, and the sludge is quickly consolidated. However, in the method, the consolidation strength of the lower layer sludge is not good, and problems such as low strength, easy collapse and large settlement after construction can be brought to later periods.

Disclosure of Invention

The invention aims to provide a high-load ultralow-position precipitation vacuum preloading method.

The invention has the innovation points that after water on the upper part of the soil body is pumped out, the water is pumped out through the drainage component, soil on the upper part of the soil body is changed into wet volume weight from floating volume weight, load is formed on the soil body below, the lower part of the soil body is subjected to the pressure of the soil on the upper part and the suction force of the drainage component, water in the lower part of the soil body is easier to be pumped to the upper part, and then the water is discharged through the ultra-low water level precipitation pressurization pipe, so that the consolidation strength of the lower part of the soil body is improved.

In order to realize the purpose of the invention, the technical scheme of the invention is as follows: a high-load ultralow-position precipitation vacuum preloading method comprises the following steps:

(1) vacuumizing and dewatering through an ultra-low water level dewatering pressure increasing pipe inserted into the soil body to reduce the water level to minus 15 to minus 3 meters;

(2) pumping water to the upper part of a soil body through a drainage assembly inserted into the soil body, wherein the drainage assembly comprises a drainage pipe, filter membrane inserting ports communicated with the side wall of the drainage pipe are arranged on two sides of the drainage pipe, a filter membrane is inserted into the filter membrane inserting ports, the filter membrane and the drainage pipe form a cross structure, two ports of the drainage pipe are connected with a vacuum device, the filter membrane is inserted into the soil body, and the drainage assembly stops vacuumizing when vacuumizing is performed to raise the water level to-3 to-1.5 meters;

(3) and (3) continuously repeating the steps (1) and (2) until the soil strength is hard and plastic, and finishing deep sludge consolidation.

Further, ultralow water level precipitation pressure boost pipe includes the core pipe, the core pipe outer wall is equipped with the chimney filter, the chimney filter includes skeleton and the cladding filter screen cloth outside the skeleton, the core pipe bottom is located the chimney filter, and the chimney filter bottom seals, the nearly bottom department of core pipe is equipped with the water inlet, the chimney filter is stretched out at the core pipe top, and chimney filter top and core pipe lateral wall be airtight connection, and the core pipe top is passed through the pipeline and is connected with the gas-liquid separation jar, and the gas-liquid separation jar is connected with vacuum apparatus. The vacuum negative pressure is conducted to the bottom of the ultra-low water level precipitation booster pipe, the underground water flows to the ultra-low water level precipitation booster pipe in a directional mode, enters the core pipe through the filter pipe, enters the gas-liquid separation tank through the pipeline, and the ultra-low water level precipitation booster pipe can pump water at an accelerated speed, so that the construction efficiency is improved.

Furthermore, a vertical shaft is further arranged on the surface of the soil body, and the gas-liquid separation tank is positioned in the vertical shaft. So that the precipitation level is further lowered.

The invention has the beneficial effects that:

1. according to the invention, water on the upper part of the soil body is pumped out and then is vacuumized through the drainage assembly, soil on the upper part of the soil body is changed into wet volume weight from floating volume weight, load is formed on the soil body below, the lower soil body is under the pressure of the soil on the upper part and the suction force of the drainage assembly, water in the soil body on the lower part is easier to be pumped to the upper part, and then the water is discharged through the ultra-low water level precipitation pressurization pipe, so that the consolidation strength of the soil body on the lower part is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a front view of the drain assembly.

Fig. 3 is a top view of a drain assembly.

Fig. 4 is a cross-sectional view of an ultra-low level precipitation booster pipe.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Example 1: as shown in figures 1, 2, 3 and 4, a high-load ultra-low-level precipitation vacuum preloading method comprises the steps of firstly vacuumizing and precipitating through an ultra-low-level precipitation pressurizing pipe 1 inserted into a soil body 7 to reduce the water level to-15 to-3 meters; ultralow water level precipitation booster pipe 1 includes

core pipe

2, 2 outer walls of core pipe are equipped with chimney filter 3, chimney filter 3 includes skeleton 3.1 and cladding filter screen cloth 3.2 outside the skeleton, 2 bottoms of core pipe are located

chimney filter

3, and 3 bottoms of chimney filter seal, 2 near bottom departments of core pipe are equipped with water inlet 2.1, 2 tops of core pipe stretch out

chimney filter

3, and 3 tops of chimney filter and 2 lateral walls of core pipe be airtight connection, 2 tops of core pipe are passed through pipeline 4 and gas-liquid separation jar 5 and are connected, gas-liquid separation jar 5 and vacuum apparatus 6 are connected, 7 surfaces of soil body still are equipped with shaft 8, gas-liquid separation jar 5 is located shaft 8. Pumping water to the upper part of the soil body 7 through a drainage component 9 inserted into the soil body 7, wherein the drainage component 9 comprises a drainage pipe 9.1, filter membrane sockets 9.2 communicated with the side walls of the drainage pipe 9.1 are arranged on two sides of the drainage pipe 9.1, a filter membrane 9.3 is inserted into the filter membrane sockets 9.2, the filter membrane 9.3 and the drainage pipe 9.1 form a cross structure, two ports of the drainage pipe 9.1 are connected with a vacuum device 6, the filter membrane 9.3 is inserted into the soil body, and the drainage component 9 stops pumping vacuum when the water level is raised to-3-1.5 meters by pumping vacuum; and continuously repeating the steps until the soil strength is hard and plastic, and finishing deep sludge consolidation.

The described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. A high-load ultra-low-level precipitation vacuum preloading method is characterized by comprising the following steps:

(2) pumping water to the upper part of a soil body through a drainage component inserted into the soil body, wherein the drainage component comprises a drainage pipe, filter membrane sockets communicated with the side walls of the drainage pipe are arranged on two sides of the drainage pipe, a filter membrane is inserted into the filter membrane sockets, the filter membrane and the drainage pipe form a cross structure, two ports of the drainage pipe are connected with a vacuum device, the filter membrane is inserted into the soil body, and the drainage component stops pumping vacuum when the drainage component pumps vacuum to raise the water level to-3 to-1.5 meters;

(3) continuously repeating the steps (1) and (2) until the soil body strength is hard and plastic, and finishing deep sludge consolidation;

the ultra-low water level precipitation supercharging pipe comprises a core pipe, wherein a filter pipe is arranged on the outer wall of the core pipe, the filter pipe comprises a framework and filter screen cloth coated outside the framework, the bottom of the core pipe is located in the filter pipe, the bottom of the filter pipe is sealed, a water inlet is arranged at the position, close to the bottom, of the core pipe, the top of the core pipe extends out of the filter pipe, the top of the filter pipe is hermetically connected with the side wall of the core pipe, the top of the core pipe is connected with a gas-liquid separation tank through a pipeline, and the gas-liquid separation tank is connected with a vacuum device.

2. The vacuum preloading method for the high-load and ultra-low-level precipitation as claimed in claim 1, wherein a vertical shaft is further arranged on the surface of the soil body, and the gas-liquid separation tank is positioned in the vertical shaft.