Construction Method of Adding Basement to Existing Building on Sand Foundation

Abstract

The invention discloses a construction method for additionally arranged a basement in an existing building on a sand foundation, which comprises the following steps: the operation of enclosure is performed around the original building, the operation of pressing pile is performed on the foundation after hole drilling and mud protection are finished, and the pile and the original foundation bear the load of a pillar together; soil under the foundation is scraped to be additionally arranged on the bottom surface of the basement, the load of the pillar is converted on the pile at the moment, and the one-time conversion of structure stress is completed; then the pouring is performed to the baseplate of the basement, the pillar is stretched to the baseplate of the basement; a part of pile positioned above the baseplate of the basement and the original foundation is cut off; the load of the original pillar is transmitted on a new pillar, and the secondary conversion of structure stress is completed, so that the storey-addition of the basement is completed. The method can efficiently reduce the influence on the surrounding environment, and efficiently controls differential settlement of the foundation during construction; the construction is convenient.

Description

technical field [0001] The patent of the present invention relates to a complete set of key technologies and construction methods for adding floors underground to existing buildings on sandy soil foundations, and belongs to the field of engineering structure reinforcement and transformation. Background technique [0002] With the increase of urban motor vehicles, adding basements to existing buildings has become one of the methods to solve the difficult problem of urban parking. In the project of adding a basement to an existing building, how to reasonably transfer the load of the superstructure and how to reduce the impact of construction on the existing building and the surrounding environment are key issues. Adding a basement to an existing building is a comprehensive system that integrates foundation pit engineering, underpinning engineering, pile foundation engineering and structural engineering. However, there are very few underground building projects in my country, ...

AI Technical Summary

Problems solved by technology

However, this method requires a relatively large rigidity of the underpinning beam, and the cost is high.

The disadvantage of the anchor static pressure pile construction method suitable for indoor construction is that the bearing capacity is limited, and it is difficult to construct in sandy soil

Instead of pile underpinning, the basement layer-increasing process of column-by-column underpinning method is likely to cause local engineering accidents, and the construction period is long, making it difficult to control the overall deformation of the building

Images