紧邻深基坑的既有历史保护建筑顶升与增层施工关键技术研究

Research on Key Techniques Jacking-up and Storey-adding Construction of Existing Historical Buildings Adjacent to Deep Foundation Pits

通过基础托换的主动保护方式可很大程度上减轻邻近深基坑开挖对既有保护建筑的安全影响。提出了基于R2拟合优度判定系数确定最优旋转轴,再根据该旋转轴计算纠倾千斤顶顶升量的一种顶升量确定方法,使纠倾顶升量的确定更加科学合理。论述了增层结构施工的难点及与之对应的针对性施工关键技术,可为同类工程提供参考。

The active protection method through foundation underpinning can greatly reduce the safety impact of adjacent deep foundation pit excavation on existing protected buildings.A method is proposed for determining the optimal rotation axis based on the R2 goodness-of-fit determination coefficient and for calculating the jacking amount of the tilting jack according to the rotation axis.This makes the determination of the jacking amount of rectification more scientific and reasonable.Finally,the difficulties in the construction of the additional layer structure and the corresponding key construction techniques are discussed,which can provide reference for similar projects.