CN114809049A

CN114809049A - Method for preventing sand and soil loss around dewatering well in water-rich sand and soil area

Info

Publication number: CN114809049A
Application number: CN202210428760.7A
Authority: CN
Inventors: 李延春; 张勋来
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-07-29

Abstract

The invention discloses a method for preventing sand and soil loss at the periphery of a dewatering well in a water-rich sand-soil area, and relates to the technical field of deep foundation pit engineering in the water-rich sand-soil area. The method for preventing the sand loss around the dewatering well in the water-rich sand soil area comprises the following specific operations: s1, processing and manufacturing the high-density concrete strainer pipes in batches, and calculating and properly increasing the number of dewatering wells according to the strainer rate; s2, processing the first section of high-density concrete strainer according to the number of the dewatering wells, namely installing a 5 mm end socket iron plate below the high-density concrete strainer. The method for preventing the sand and soil loss at the periphery of the dewatering well in the water-rich sand and soil area can eliminate potential safety hazards caused by sand and soil loss caused by dewatering at one time, ensure that a foundation has no accumulated water and a foundation pit side slope is stable, and prevent the occurrence of safety accidents caused by collapse of the foundation pit side slope caused by the loss of the sand and soil, thereby realizing the aim of safety and no accident of the whole building system engineering.

Description

Method for preventing sand and soil loss around dewatering well in water-rich sand and soil area

Technical Field

The invention relates to the technical field of deep foundation pit engineering in a water-rich sandy soil area, in particular to a method for preventing sand and soil loss around a dewatering well in the water-rich sandy soil area.

Background

At present, with the rapid development of economy in China, the requirements of people on living environment and residence quality are higher and higher, and in the development stage of residential districts, in order to meet the requirements of people, various house enterprises can design the residential districts into a people and vehicle shunting mode, namely all travel tools of people drive into a basement, so that the garden-type life of residents can be guaranteed, and the residents can be guaranteed to have a comfortable and safe environment after living and leisure. In the whole process of basement foundation pit construction, firstly, construction without accumulated water in the foundation is the primary condition for ensuring the quality of construction engineering, and secondly, the safety of the foundation pit side slope is the premise for ensuring safe production. In order to meet the two conditions, a feasible foundation pit dewatering technical scheme must be compiled according to a geological survey report and different underground water levels of different soil qualities, and the feasible foundation pit dewatering technical scheme is implemented after being qualified by relevant experts.

In the construction practice of dewatering wells, a scheme of pipe well dewatering is generally adopted. The conventional method comprises the following steps: according to the precipitation technical scheme, an excavation line of a basement foundation pit is determined on a basement plane construction drawing, and a certain number of tube well precipitation wells are arranged outside the safe distance from the excavation line. In the construction and installation process of the precipitation well, the outer wall of the pipe well is wrapped with a layer of filter cloth in consideration of slurry entering the pipe well, and precipitation is carried out after mechanical well washing. However, the scheme cannot prevent the loss of the special soil texture, namely the water-rich sandy soil area, in the precipitation process, and further causes greater potential safety hazard.

Before the foundation pit of the basement of the building engineering is excavated, a precipitation scheme is formulated according to the soil type, the underground water level elevation and the like described by a geological survey report, and after implementation, the foundation pit is ensured to have no accumulated water and no collapse phenomenon after excavation, so that the foundation pit is convenient to construct and potential safety hazards of the side slope are eliminated.

In the construction process of the dewatering well in the water-rich sandy soil area, due to the fact that the specific soil category, namely sandy soil, is not known enough, a large amount of sandy soil around the dewatering well is lost in the dewatering process after the dewatering well is formed, a cavity is formed, the dewatering well is easy to damage, the dewatering well loses the dewatering effect, and greater potential safety hazards are generated on the side slope of a foundation pit.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a method for preventing sand and soil loss at the periphery of a dewatering well in a water-rich sand-soil area, which solves the problems that in the construction process of the dewatering well in the water-rich sand-soil area, due to the fact that the specific soil type, namely sandy soil, is not known enough, a large amount of sandy soil at the periphery of the dewatering well is lost in the dewatering process after the dewatering well is formed, a cavity is formed, the dewatering well is easily damaged and loses the dewatering effect, and greater potential safety hazards are generated on the side slope of a foundation pit.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a method for preventing sand and soil loss around a dewatering well in a water-rich sand and soil area specifically comprises the following operations:

s1, processing and manufacturing the high-density concrete strainer pipes in batches, and calculating and properly increasing the number of dewatering wells according to the strainer rate;

s2, processing a first section of high-density concrete strainer according to the number of the dewatering wells, namely installing a 5 mm end socket iron plate below the high-density concrete strainer;

s3, wrapping double-layer nylon filter cloth on the outer wall of the high-density concrete strainer, and then sequentially installing;

s4, filling fine stones on the outer side of the high-density concrete strainer;

s5, a water pump with a water level controller and a PPR drain pipe.

(III) advantageous effects

The invention provides a method for preventing sand and soil loss around a dewatering well in a water-rich sand and soil area. The method has the following beneficial effects:

the method for preventing the sand and soil loss at the periphery of the dewatering well in the water-rich sand and soil area can eliminate potential safety hazards caused by sand and soil loss caused by dewatering at one time, ensure that a foundation has no accumulated water and a foundation pit side slope is stable, and prevent the occurrence of safety accidents caused by collapse of the foundation pit side slope caused by the loss of the sand and soil, thereby realizing the aim of safety and no accident of the whole building system engineering.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: the water filter comprises a high-density concrete water filter pipe 1, a double-layer nylon filter cloth 2, a 5 mm end socket iron plate 3, a water pump 4 with a water level controller, a PPR water drain pipe 5, a first section of high-density concrete water filter pipe 6 and fine stones 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

Referring to fig. 1, the present invention provides a technical solution: a method for preventing sand and soil loss around a dewatering well in a water-rich sand and soil area specifically comprises the following operations:

s1, processing and manufacturing the high-density concrete strainer pipes 1 in batches, and calculating and properly increasing the number of dewatering wells according to the water filtration rate;

s2, processing the first section of high-density concrete strainer 6 according to the number of the dewatering wells, namely installing a 5 mm end socket iron plate 3 below the high-density concrete strainer 1;

s3, wrapping double-layer nylon filter cloth 2 on the outer wall of the high-density concrete strainer 1, and then sequentially installing;

s4, filling fine stones 7 on the outer side of the high-density concrete strainer 1;

s5, a water pump 4 with a water level controller and a PPR drain pipe 5.

Processing and manufacturing high-density concrete water filter pipes, and calculating the number of dewatering wells according to the water filter rate; the high-density concrete strainer of the first section must be sealed, and bottom sandy soil is prevented from being refilled into a precipitation well during installation. The density of the filter pipe is increased, and the loss of sandy soil is prevented by using double-layer nylon filter cloth and fine stones; considering that the water filtration amount after the measures are taken is small, and the technical scheme of arranging the water pump with the water level controller in the dewatering well is provided. The method can eliminate the loss phenomenon of sandy soil in the water-rich area in the dewatering process at one time, not only achieves the dewatering effect, but also can ensure the safety and the stability of the foundation pit side slope, and avoids the safety accident caused by the collapse of the foundation pit side slope, thereby achieving the aim of realizing the safety and no accident of the whole building system engineering.

The working principle is as follows: the density of the filter pipe is increased, and the loss of sandy soil is prevented by using double-layer nylon filter cloth and fine stones; considering that the water filtration amount after the measures are taken is small, and the technical scheme of arranging the water pump with the water level controller in the dewatering well is provided. The method can eliminate the loss phenomenon of sandy soil in the water-rich area in the dewatering process at one time, not only achieves the dewatering effect, but also can ensure the safety and the stability of the foundation pit side slope, and avoids the safety accident caused by the collapse of the foundation pit side slope, thereby achieving the aim of realizing the safety and no accident of the whole building system engineering.

In conclusion, the method for preventing the sand and soil loss at the periphery of the dewatering well in the water-rich sand and soil area can eliminate potential safety hazards caused by the sand and soil loss caused by dewatering at one time, ensure that the foundation has no accumulated water and the foundation pit side slope is stable, and prevent the foundation pit side slope collapse caused by the sand and soil loss from causing safety accidents, thereby realizing the aim of safety and no accident of the whole construction system engineering.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A method for preventing sand and soil loss around a dewatering well in a water-rich sand and soil area is characterized by comprising the following steps: the specific operation is as follows:

s1, processing and manufacturing the high-density concrete water filter pipes (1) in batches, and calculating and properly increasing the number of dewatering wells according to the water filtration rate;

s2, processing a first section of high-density concrete strainer (6) according to the number of the dewatering wells, namely installing a 5 mm end socket iron plate (3) below the high-density concrete strainer (1);

s3, wrapping double-layer nylon filter cloth (2) on the outer wall of the high-density concrete strainer (1) firmly, and then sequentially installing;

s4, filling fine stones (7) on the outer side of the high-density concrete water filter pipe (1);

s5, a water pump (4) with a water level controller and a PPR drain pipe (5).