CN-122013782-A - Construction method for demolishing deep foundation pit partition wall

Abstract

The invention provides a construction method for demolishing a deep foundation pit divided diaphragm wall, which comprises the steps of dividing the diaphragm wall into blocks by using a rope saw, enabling slits in the horizontal direction to form a certain gradient, transferring concrete blocks to a hoisting hole along the gradient by using an electric hoist, hoisting the concrete blocks to a flat car from the hoisting hole, and connecting the concrete blocks with the diaphragm wall of an undetached part by using materials such as I-steel in the gradient transferring process of the concrete blocks to form guardrails so as to ensure that the concrete blocks do not fall. The method has strong operability, simple material equipment, no load of the shear wall concrete blocks is transmitted to the structural floor slab, the back-roof measure is reduced, the main structure can be effectively protected from being damaged, and the problems of great influence on the main structure, great dust and noise pollution and long construction period of the traditional dismantling method are solved.

Inventors

• ZHU HAI
• JIANG XINGWEI
• TANG CHAO
• ZHANG YU
• ZHOU ZHONGTAI

Assignees

• 中建八局第三建设有限公司

Dates

Publication Date

20260512

Application Date

20260311

Claims (3)

1. 1. The construction method for demolishing the deep foundation pit separated diaphragm wall is characterized by comprising the following steps: Step 1, determining the position and the shape of an automobile crane according to the situation of a construction site; Step 2, determining the block size of the ground connecting wall (1) according to the performance parameters of the automobile crane and the position of the hoisting opening; Step 3, dividing and marking, drilling and cutting according to the dividing size of the diaphragm wall (1); Step 4, the I-steel pin shaft (5) passes through the lifting hole to fix the I-steel guardrail (2); step 5, transferring the concrete blocks to be lifted to the edges of the fixed blocks by using an electric hoist (3) and a steel wire rope (4); step 6, lifting the concrete blocks out of the basement block by utilizing an automobile crane; step 7, cutting a bottom part slit of the fixed block, and lifting the fixed block out of the basement by using an automobile crane; and 8, repeating the steps 3 to 7, and removing the ground continuous wall layer by layer in a block manner.
2. 2. The method for demolishing the partition wall of the deep foundation pit according to claim 1, wherein in the step 3, two sides of the first concrete block are cut into inverted splayed shapes so as to facilitate lifting, the bottoms of the fixed blocks are not cut off, and the two sides of the fixed blocks are horizontally cut to form a certain gradient, and the gradient is 2% for the fixed blocks.
3. 3. The construction method for demolishing the partition wall of the deep foundation pit according to claim 1, wherein in the demolishing process of the partition wall of the deep foundation pit, the floor slab of the main structure is sealed layer by layer according to the design working condition requirement, and the partition wall is demolished downwards continuously after the main structure reaches the support changing strength.

Description

Construction method for demolishing deep foundation pit partition wall Technical Field The invention belongs to the technical field of buildings, and particularly relates to a construction method for demolishing a deep foundation pit divided diaphragm wall. Background Along with urban development, subway construction mileage is increased, land value along the subway is increased, and construction difficulty of engineering projects along the subway is increased. In order to reduce the influence of deformation of the foundation pit on the subway tunnel in the project deep foundation pit construction process, a common method is to divide a large foundation pit into small foundation pits by using underground continuous walls during foundation pit design. After the basement on one side of the dividing wall is capped and the periphery is backfilled, excavation of the foundation pit on the other side of the dividing wall is carried out, so that the integral deformation of the foundation pit is controlled, and the safety of a subway tunnel is ensured. In such projects, the foundation pit intermediate wall needs to be dismantled layer by layer after the underground structures on two sides are capped and backfilling is completed, and the main body structure is sealed layer by layer. The traditional method is that the gun head digger enters a basement to be broken, and then the broken slag is transported outwards. The construction method has the advantages of high noise, serious dust pollution and long demolition construction period, and the excavator enters the floor of the basement and can damage the floor of the main structure. How to solve such problems is a problem which needs to be solved at present. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a construction method for demolishing a deep foundation pit divided diaphragm wall, which solves the problems of great influence on a main structure, great dust emission and noise pollution and long construction period of the traditional demolishing method. The present invention achieves the above technical object by the following technical means. The construction method for demolishing the deep foundation pit divided diaphragm wall comprises the following steps: Step 1, determining the position and the shape of an automobile crane according to the situation of a construction site; Step 2, determining the block size of the ground connecting wall according to the performance parameters of the automobile crane and the position of the lifting opening; Step 3, dividing and marking, drilling and cutting according to the dividing size of the diaphragm wall; step 4, the I-steel pin shaft penetrates through the hoisting hole to fix the I-steel guardrail; step 5, transferring the concrete blocks to be lifted to the edges of the fixed blocks by using an electric hoist and a steel wire rope; step 6, lifting the concrete blocks out of the basement block by utilizing an automobile crane; step 7, cutting a bottom part slit of the fixed block, and lifting the fixed block out of the basement by using an automobile crane; and 8, repeating the steps 3 to 7, and removing the ground continuous wall layer by layer in a block manner. In step 3, the two sides of the first concrete block are cut into inverted splayed shapes so as to facilitate lifting, the bottom of the fixed block is not cut off, the two sides of the fixed block are horizontally cut to form a certain gradient, and the gradient of the slope fixed block is 2%. Further, in the demolition flow of the deep foundation pit partition wall connection demolishing construction, the main structure floor slab is sealed layer by layer according to the design working condition requirement, and the partition wall connection is demolished downwards continuously after the main structure reaches the support changing strength. The invention has the following beneficial effects: The invention uses a rope saw to divide the ground continuous wall into blocks, cuts the slits in the horizontal direction to form a certain gradient, transfers the concrete blocks to a hoisting hole along the gradient by using an electric hoist, and lifts the concrete blocks from the hoisting hole to a flat car for departure. In the gradient transfer process of the concrete blocks, the concrete blocks are connected with the ground connecting wall of the undetached part by using materials such as I-steel and the like to form guardrails, so that the concrete blocks are prevented from falling. The method has strong operability, simple material equipment, no load of the shear wall concrete blocks is transmitted to the structural floor slab, the back-roof measure is reduced, the main structure can be effectively protected from being damaged, and the problems of great influence on the main structure, great dust and noise pollution and long construction period of the traditional dismantling method are solved. Drawings FIG. 1 is a