手掘式顶管基础托换技术在玉皇阁保护工程中的应用

Application of Manual Pipe-jacking Foundation Underpinning Technique in Protection Project of Kaifeng Jade Emperor Pavilion

以开封玉皇阁整体顶升保护工程为例,介绍了一种新颖的基础托换技术,其基本思路为:采用手掘式顶管技术缓慢将预制混凝土箱梁顶入建筑物下,逐步使上部结构坐落在一系列箱梁上,随后浇筑芯梁和联系梁,最终使建筑物坐落在一个整体性良好的"托盘"上。此外,给出了关键构件箱梁的设计原则、顶进系统的设计及相关计算方法,为砖石古建保护提供了一种新技术。

Taking the integral lift-up protection project of Kaifeng Jade Emperor Pavilion as an example,a new foundation underpinning technique is presented.Its basic idea is as follows：firstly,the precast concrete box girders are slowly jacked under the building by the manual pipe-jacking technique,so the structure sits gradually on the box girders;and then the core beams and the joining beams concrete is poured;consequently,the construction finally locates on a ‘platform’with good integrity.Moreover,the design principles of key member box girders,the design of jacking system and its related calculation methods are also proposed,and this method provides a new technique to the conservation of historical masonry buildings.