深基坑下穿文物古桥原位保护施工方案研究  

Research on In-situ Protection Construction Scheme for the Deep Foundation Pit Undercrossing Cultural Relic Ancient Bridge

作　　者：张南 ZHANG Nan(The Palace Museum,Beijing 100009,China)

机构地区：[1]故宫博物院,北京100009

出　　处：《工程技术研究》2023年第17期20-22,共3页Engineering and Technological Research

摘　　要：文章以故宫博物院内某深基坑施工下穿文物古桥为背景,从施工方案设计和地基承载力等方面对古桥的原位保护进行研究。结果表明:采取围堰截留的方式,搭设脚手架支托桥拱底,有利于施工,可避免构件发生位移;采取全断面注浆和隔榀超前小导管注浆等措施,有助于减少沉降,缩短施工周期;施工过程中应加强古桥的水平和竖向位移监测,以便及时调整施工方案,制订应对措施。Based on the construction of a deep foundation pit undercrossing a cultural relic ancient bridge in the Palace Museum,this paper studies the in-situ protection of the ancient bridge from the aspects of construction scheme design and foundation bearing capacity.The results show that adopting the method of cofferdam interception and setting up scaffolding to support the arch bottom of the bridge are beneficial to the construction and can avoid the displacement of the components;adopting measures such as full section grouting and advanced ductule grouting with separated frames can help reduce settlement and shorten the construction period;the horizontal and vertical displacement monitoring of the ancient bridge should be strengthened during the construction process to adjust the construction scheme in time and formulate countermeasures.

关 键 词：文物古桥原位保护 深基坑下穿 围堰截留 全断面注浆 

分 类 号：U415.6[交通运输工程—道路与铁道工程]