钢管桩托换技术在既有建筑地下室改造中的应用

Application of Steel Pipe Pile Underpinning Technique in an Existing Building Basement Renovation

某建筑改造施工中,在不拆除原有上部结构前提下,将原有无地下室部位扩建为地下室。地基基础施工期间,采用钢管桩对原有独立基础进行支撑并增加新混凝土承台与原独立基础紧密结合浇筑成为一个整体,从而替换原有独立基础承载,达到钢管桩托换承台的目的。总结了本工程钢管桩托换承台成功的施工经验,对托换承台在既有建筑地下室加固改造中施工方法及施工工艺进行了较为系统的介绍。

In the construction of a building renovation, the original site without basement needs to be expanded as basement under the premise of no removal of the existing upper structure. During foundation construction, steel pipe pile foundation was used to support the existing independent foundation, and adding new concrete pile caps were poured into a whole with the original independent foundation closely to replace the original independent foundation bearing, which reaches steel pipe pile underpinning the caps. This paper summarized successful experience of the steel pipe pile underpinning caps, introduced systematically construction method of underpinning cap used in retrofitting construction of the existing buildings basement.