WO2024037586A1

WO2024037586A1 - Double-foundation-pit double-working-condition construction method

Info

Publication number: WO2024037586A1
Application number: PCT/CN2023/113517
Authority: WO
Inventors: 游鹏超; 孙海伟; 黄亚均; 梅晓峰; 史阳; 李颖; 林夏华; 王艳惠; 赵亮; 陈凯; 陈金豪
Original assignee: 中建三局集团(浙江)有限公司; 中建三局第三建设工程有限责任公司
Priority date: 2022-08-19
Filing date: 2023-08-17
Publication date: 2024-02-22
Also published as: CN115387344A; CN115387344B

Abstract

The present application relates to the field of foundation pit construction, and in particular to a double-foundation-pit double-working-condition construction method. The method comprises the following steps: foundation pit D and foundation pit B are both adjacent to foundation pit A, and surfaces of foundation pit A, foundation pit B and foundation pit D are cleaned; foundation pit D comprises area D1 and area D2, foundation pit A comprises area A1 and area A2, and foundation pit B comprises area B1 and area B2, wherein area B2 is adjacent to foundation pit A, and the order of earthwork excavation is sequentially: area B1, area B2, foundation pit A and foundation pit D; foundation pit B is provided with a basement structure; when the earthwork excavation of area B2 is performed, the basement structure in area B1 has positive and negative zeroes; when the earthwork excavation of the foundation pit A is performed, the basement structure in area B2 is completed, and the construction of the floor of foundation pit D is completed; and when the earthwork excavation of foundation pit D is performed, first supporting construction of area B2 is completed. The present application has the effects of shortening a construction period and increasing construction speed.

Description

A construction method for double foundation pits and double working conditions

Technical field

This application relates to the field of foundation pit construction, and in particular to a rapid construction method for double foundation pits and dual working conditions.

Background technique

A foundation pit is a soil pit excavated at the foundation design location according to the foundation elevation and foundation plane dimensions. Before excavation, the excavation plan should be determined based on geological and hydrological data and the conditions of buildings near the site, and waterproofing and drainage work should be carried out. Large foundation pits use methods such as underground continuous walls and column-type bored pile interlocking to prevent the outside soil from collapsing. Therefore, when constructing large foundation pits, for the sake of construction safety, a single foundation pit is often used. When the number of pits is large, the construction time and construction period tend to be longer.

Contents of the invention

In order to shorten the construction period and increase the construction speed, this application provides a rapid construction method for double foundation pits and double working conditions.

This application provides a construction method for double foundation pits and double working conditions, which adopts the following technical solution:

A method for construction of double foundation pits and dual working conditions, including the following steps: cleaning the surfaces of foundation pit A, foundation pit B and foundation pit D, and foundation pit D and foundation pit B are adjacent to foundation pit A;

Foundation pit D includes area D1 and area D2, foundation pit A includes area A1 and area A2, and foundation pit B includes area B1 and area B2. Area B2 is adjacent to foundation pit A. The order of earthwork excavation is area B1, B2. Area, A foundation pit, D foundation pit;

Pit B is equipped with a basement structure;

During earth excavation in area B2, the basement structure in area B1 showed positive and negative zero;

During the excavation of foundation pit A, the basement structure of area B2 is completed, and the construction of the floor of foundation pit D is completed;

During the excavation of foundation pit D, the first support construction in area B2 was completed.

By adopting the above technical solution, the purpose of simultaneous construction of multiple foundation pits is achieved, the construction period is shortened, and the purpose of rapid construction is achieved.

Optionally, the D foundation pit, A foundation pit and B foundation pit are arranged in a "7" shape, the D2 area is adjacent to the A foundation pit, and a first reinforcement structure is provided in the D2 area close to the A foundation pit;

Areas A1 and A2 are the north and south areas of foundation pit A respectively. Area A1 is equipped with a second reinforcement structure;

After the construction of the B1 layer structure is completed in the B1 area, the second layer of earth excavation and support construction will be carried out in the A1 area.

By adopting the above technical solution, the first reinforcement structure and the second reinforcement structure provide construction conditions for the construction of foundation pit A, so that the inside of foundation pit A and foundation pit B can be constructed at the same time, shortening the construction period and increasing the construction speed.

Optionally, the B2 area is divided into B2-1 area and B2-2 area from west to east. After the construction of B2-1 area reaches the B1 floor and the construction of the D1 area floor and D2 area floor is completed, the A2 area will undergo the second Excavation of layers of earth and support construction.

By adopting the above technical solution, the interior of foundation pit A and foundation pit B can be constructed at the same time, shortening the construction period.

Optionally, the A foundation pit, B foundation pit and D foundation pit all adopt the following method.

By adopting the above technical solution, after the first reinforcement structure and the second reinforcement structure are stabilized, foundation pit A, foundation pit B and foundation pit D are constructed using the following construction method, which meets the land requirements and construction requirements.

Optionally, the first reinforcement structure is a fixed structure composed of multiple first main columns and multiple first support columns. The first main columns are stable inside the D foundation pit, and the first main columns are supported by the first The columns are fixedly connected to the original support structure, and the first reinforcement structure provides support to the northeast and southeast directions of the D2 area.

By adopting the above technical solution, the first reinforcement structure provides support to the northeast and southeast directions of the D2 area, thereby achieving the stabilization of the edge of the foundation pit shared by the D2 area and the A foundation pit, and providing conditions for the construction of the A foundation pit. The construction period is shortened.

Optionally, the plurality of first main columns are divided into two groups. The connection lines of the two groups of first main columns are parallel to the north-south direction. The first main columns are connected by the first support column. Fixed connection with the original support structure through the first support column.

By adopting the above technical solution and fixing the two sets of first main columns with the original support structure, the stress-bearing area of the original support structure is increased, making the stress inside the D2 area more stable, and providing safety guarantee and construction for the construction of foundation pit A. condition.

Optionally, the second reinforcement structure is a fixed structure composed of a plurality of second main columns and a plurality of secondary support columns. The second main columns are stable inside the foundation pit A, and the second main columns are supported by the second The columns are connected to each other, and the second main column is fixedly connected to the original support structure through the second support column. The second reinforcement structure provides northeastern support for area A1.

By adopting the above technical solution, the original support structure inside the A foundation pit was reinforced, which provided conditions for the simultaneous construction of the A foundation pit.

Optionally, the connection lines of the plurality of second main columns are at an angle with the due east direction, and the second main columns are connected to the original support structure in the northeast direction of Area A1 through the second support column.

By adopting the above technical solution, the original support structure of Area A1 was reinforced.

To sum up, this application includes at least one of the following beneficial technical effects:

1. By using the first reinforcement structure and the second reinforcement structure, the construction speed is increased and the construction period is shortened.

Description of drawings

Figure 1 is the location relationship diagram of D foundation pit, A foundation pit and B foundation pit;

Figure 2 is a partial structural schematic diagram intended to emphasize the first reinforcement structure;

Figure 3 is a partial structural schematic diagram intended to emphasize the second reinforcing structure.

Explanation of reference signs: 1. First reinforcement structure; 11. First main column; 12. First support column; 2. Second reinforcement structure; 21. Second main column; 22. Second support column.

Implementation

This application will be further described in detail below in conjunction with Figures 1-3.

The embodiment of this application discloses a rapid construction method for double foundation pits and dual working conditions.

Referring to Figure 1, foundation pit D and foundation pit B are adjacent to foundation pit A. Foundation pit D, foundation pit B, and foundation pit A all adopt the construction method of follow-up construction. Foundation pit D, foundation pit A, and foundation pit B are in the same direction. "7" shape arrangement, D2 area is adjacent to A foundation pit, D foundation pit includes D1 area and D2 area, D1 area and D2 area are distributed from west to east, A foundation pit includes A1 area and A2 area, A1 area and Area A2 is the north and south areas of foundation pit A respectively. Foundation pit B includes area B1 and area B2. Areas B1 and B2 are distributed from north to south. D2 and area A are adjacent to each other, and area A2 and area B2 are adjacent to each other. Neighboring, there are basement structures at both foundation pit B and foundation pit A.

After the B1 layer structural construction is completed in B1 area, the second layer of earth excavation and support construction will be carried out in A1 area. A rapid construction method for double foundation pits and double working conditions, including the following steps:

S1. Clean the surfaces of foundation pit A, foundation pit B and foundation pit D; then carry out earthwork excavation. The order of earthwork excavation is area B1, foundation pit A, area B2 and foundation pit D. The first layer of earthwork is completed. After excavation, support construction will be carried out on the first floor and trestle construction will be carried out;

During earth excavation in areas S2 and B2, positive and negative zeros were found in the basement structure of area B1;

During the excavation of foundation pit D, the first support construction in area B2 was completed, which realized the purpose of simultaneous construction of multiple foundation pits, shortened the construction period, and achieved the purpose of rapid construction; foundation pits D and B are both in line with A The foundation pits are adjacent, clean the surfaces of foundation pit A, foundation pit B and foundation pit D;

A first reinforcement structure 1 is provided in areas S3 and D2 close to foundation pit A. The first reinforcement structure 1 provides support in the northeast and southeast directions to the edge of the foundation pit common to area D2 and foundation pit A;

The A1 area is provided with a second reinforcement structure 2. The second reinforcement structure 2 provides northeastern support to the edge of the A1 area;

Through the reinforcement of the first reinforcement structure 1 and the reinforcement of the second reinforcement structure 2, after the structural construction of the B1 layer in the B2 area is completed, the second layer of earth excavation construction and the second support construction can be carried out in the A1 area, and the B2 area is from west to east. It is set as B2-1 area and B2-2 area. When the B2-1 area is constructed to the B0 layer, the A2 area can carry out the second layer of earth excavation and the second support at the same time, further shortening the construction period and achieving the purpose of rapid construction. .

In the traditional construction method, due to the lack of support from the first reinforcement structure 1 and the second reinforcement structure 2, and the lack of force support, the user can only complete the construction of the B0 layer structure in the B2-2 area and the B0 layer structure in the D area. After completion, the second layer of earth excavation construction and the second support construction in the A2 area will be started. The engineering efficiency is low.

Referring to Figures 2 and 3, what is within the dotted line at E in Figure 2 is the first reinforcement structure 1, and what is within the dotted line at F in Figure 3 is the second reinforcement structure 2. The first reinforcement structure 1 and the second reinforcement structure 2 of this application Both support trestles and three-layer concrete supports. The first reinforcement structure 1 includes a fixed structure composed of a plurality of first main columns 11 and a plurality of first support columns 12. In the embodiment of the present application, the first main column 11 is The number is six. The first main column 11 is firmly fixed inside the D foundation pit. The first main column 11 is fixedly connected to the original support structure through the first support column 12 . The plurality of first main columns 11 are divided into two groups. The connection lines of the two groups of first main columns 11 are parallel to the north-south direction. The number of the first main columns in the group close to the foundation pit A is two, and the number of the first main columns 11 in the group far away from the foundation pit A is two. The number of the first main columns 11 in the group is four. By fixing the two groups of first main columns 11 to the original support structure, the stress-bearing area of the original support structure is increased. The first main columns 11 are connected by the first support column 12 , the first main column 11 is fixedly connected to the original support structure through the first support column, which makes the stress inside the D2 area more stable and provides safety guarantee and construction conditions for the construction of foundation pit A.

Referring to Figures 2 and 3, the second reinforcement structure 2 is a fixed structure composed of a plurality of second main columns 21 and a plurality of second support columns 22. In the embodiment of the present application, the number of the second main columns 21 is three. The second main columns 21 are stable inside the foundation pit A. The second main columns 21 are connected to each other through the second support columns 22, and the second main columns 21 are fixedly connected to the original support structure through the second support columns 22. Three second main columns 21 are connected to each other through the second support columns 22. There is an angle between the connection line of the main column 21 and the due east direction. The second main column is connected to the original support structure in the northeast direction of the A1 area through the second support column 22, so that the second reinforcement structure 2 provides northeast support for the A1 area. force.

Furthermore, in this application, the original support structure, the first reinforcement structure 1 and the second reinforcement structure 2 are all connected by a support trestle, so that the first reinforcement structure 1 and the second reinforcement structure 2 can be connected in the same way as the original support structure. , improve the stability of fixation.

The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application shall be covered by the scope of protection of the present application. Inside.

Claims

A method of construction of double foundation pits and double working conditions, which is characterized by: including the following steps:

Clean the surfaces of foundation pit A, foundation pit B and foundation pit D. Foundation pit D and foundation pit B are adjacent to foundation pit A;

Foundation pit D includes area D1 and area D2, foundation pit A includes area A1 and area A2, and foundation pit B includes area B1 and area B2. Area B2 is adjacent to foundation pit A. The order of earthwork excavation is area B1, B2. Area, A foundation pit, D foundation pit;

Pit B is equipped with a basement structure;

During earth excavation in area B2, the basement structure in area B1 showed positive and negative zero;

During the excavation of foundation pit A, the basement structure of area B2 is completed, and the construction of the floor of foundation pit D is completed;

During the excavation of foundation pit D, the first support construction in area B2 was completed;

The D foundation pit, A foundation pit and B foundation pit are arranged in a "7" shape, the D2 area is adjacent to the A foundation pit, and a first reinforcement structure (1) is provided in the D2 area close to the A foundation pit;

Areas A1 and A2 are the north and south areas of foundation pit A respectively. Area A1 is equipped with a second reinforcement structure (2);

After the B1 layer structural construction is completed in B1 area, the second layer of earth excavation and support construction will be carried out in A1 area;

The B2 area is divided into B2-1 area and B2-2 area from west to east. The B2-1 area is constructed to the B1 layer and after the construction of the D1 area floor and the D2 area floor is completed, the second layer of earth excavation is carried out in the A2 area. and supporting construction;

The A foundation pit, B foundation pit and D foundation pit all adopt the following method;

The first reinforcement structure (1) is a fixed structure composed of a plurality of first main columns (11) and a plurality of first support columns (12). The first main columns (11) are stable inside the D foundation pit. A main column (11) is fixedly connected to the original support structure through the first support column (12), and the first reinforcement structure (1) provides support force to the northeast and southeast of the D2 area;

The second reinforcement structure (2) is a fixed structure composed of a plurality of second main columns (21) and a plurality of second support columns (22). The second main columns (21) are stable inside the foundation pit A. The two main columns (21) are connected to each other through the second support column (22), and the second main column (21) is fixedly connected to the original support structure through the second support column (22). The second reinforcement structure (2) is Zone A1 provides support in the northeast direction.
A method of construction of double foundation pits and double working conditions according to claim 1, characterized in that: the plurality of first main columns (11) are divided into two groups, and the connection lines of the two groups of first main columns (11) Both are parallel to the north-south direction, the first main columns (11) are connected through the first support column (12), and the first main column (11) is fixedly connected to the original support structure through the first support column (12).
A method of construction of double foundation pits and double working conditions according to claim 1, characterized in that: the connection lines of the plurality of second main columns (21) have an angle with the due east direction, and the second main columns (21) ) is connected to the original support structure in the northeast direction of Area A1 through the second support column (22).