Structure and method for reducing extrusion stress of foundation

Abstract

The invention relates to a structure for reducing extrusion stress of a foundation. The structure is used in construction of foundation pits close to buildings. The structure comprises prestressed pipe piles and further comprises one or more stress release holes. The stress release holes are located between the prestressed pipe piles of a foundation pit and a building. The invention further provides a method for reducing the extrusion stress of the foundation. The method comprises the steps that (1) the interval between the foundation pit and the building is measured; (2) the inserting piling position and depth of the prestressed pipe piles of the foundation pit are determined; (3) the stress release holes are formed between the pile bases of the prestressed pipe piles of the foundation pit and the building; and (4) the prestressed pipe piles are constructed at the bottom of the foundation pit. The structure and method for reducing the extrusion stress of the foundation can effectively release or eliminate stress and extrusion stress generated in the construction process of the prestressed pipe piles of the system, so that damage to the foundation of the surrounding building from stress is reduced, and the structure and method are especially suitable for construction of foundation pits close to buildings.

Description

technical field [0001] The invention relates to the field of foundation reinforcement of deep foundation pit system prestressed pipe piles in the field of construction engineering, especially the technical field of prestress elimination when the foundation pit system prestressed pipe pile foundation is reinforced when the deep foundation pit is relatively close to buildings. Background technique [0002] Deep and thick silt is widely distributed in my country, especially in coastal and inland rivers and lakes, such as Tianjin, Lianyungang, Shanghai, Hangzhou, Ningbo, Taizhou, Wenzhou, Fuzhou, Xiamen, Zhanjiang, Guangzhou, Shenzhen, Zhuhai, etc. coastal areas. In the foundation pit foundation reinforcement construction under deep silt geological conditions, the foundation reinforcement methods for silt foundation pits usually use various pile foundations such as prestressed pipe piles, bored piles, and cement mixing piles, or a variety of pile foundations. Composite foundatio...

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Problems solved by technology

[0003] However, in the actual construction of bored piles, the construction progress is slow and the cost is high. In some emergency and emergency projects, prestressed pipe piles are used to reinforce the foundation and the construction progress is fast and the cost is low. The resulting extrusion will endanger the safety of surrounding buildings if the foundation pit is close to the existing buildings

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