历史保护建筑改扩建的设计与应用

Design and application of rebuilding and extension of heritage buildings

历史保护建筑的改扩建工程实施的重点在两个方面,即老建筑的加固和新建筑施工。老建筑的加固难点在于不损坏原有结构,新建筑的施工难点在于要严格控制其施工对老建筑的影响。主要基于益丰大厦改扩建工程的成功实践,介绍老建筑的基础加固的实施方法,以及受各种条件制约的新楼的深基坑工程设计。该项目位于上海外滩,周边紧邻多幢历史保护建筑,老楼采用组合锚杆静压桩的加固技术,新楼深基坑工程采用逆作法施工技术。监测结果表明,这些技术成功实现了对历史保护建筑的改扩建,同时良好的保护了周边环境,也满足了业主的工期要求。该项目的成功实施为今后类似项目提供了一定的经验借鉴。

The rebuilding and extension of the heritage buildings include two important sides.One is the foundation improvement of the old buildings,the other is the construction of new buildings.The problem of the former is that the original structures cannot be damaged during construction,and that of the latter is the difficulty in minimizing the influences on the old buildings during the deep excavation construction.Based on the successful case of Yifeng Building,the detail of how to reinforce the foundation of the old buildings,and how to design the construction of deep excavation of the new building under restriction of every aspect is introduced.This project is located at the Bund and is adjacent to several heritage buildings.Composite anchor jacked piles are applied to the rebuilding of the old buildings,and the top-down construction method is applied to the deep excavation of the new ones.It is shown that these techniques result in successful rebuilding of heritage buildings and surroundings.The successful application supplies some reference to similar projects in future.