摘要
研究目的:武汉二七长江大桥主桥为三塔双索面结合梁斜拉桥,5#墩为3个主塔中的边主塔墩,由于墩位周边环境和工期制约,其深水基础钻孔平台和围堰无法采用常规的散拼安装方法,因此需专门研究采用'模块化'施工技术。研究结论:(1)可将钻孔平台与围堰划分为5个大型'模块',工厂制造单元件,在异地水上整体组拼后整体水上拖运至墩位;(2)利用大型浮吊首先吊装围堰内支撑2个'模块',然后插打钢护筒,再吊装钻孔平台3个'模块',形成稳定的钻孔平台;(3)将围堰内支撑'模块'连接成整体并下放至设计标高,以内支撑为导向插打钢板桩,形成围堰结构;(4)该技术具有安装组合方便快捷、工程质量安全可靠等多项优势,可供类似环境和工期压力较大的桥梁深水基础借鉴和采用。
Research purposes： The main bridge of the Erqi Yangtze River Bridge in Wuhan is a composite girder cable - stayed bridge with three pylons and double cable planes. The Pylon Pier 5 is the side pylon pier among the three main pylons. The conventional scattered assembling method could not be used for the drilling platform and cofferdam for the deep water foundation because of the surrounding environment and the limitation of the construction schedule, so the special modular construction technology was studied and adopted. Research conclusions：With this construction technology, the drilling platform and the cofferdam were divided into five large- scale modules, and the units manufactured in the factory were hauled to the pier site after being assembled integrally on the water in other places. On the construction site, the two modules used for supporting the cofferdam were hoisted by the large floating crane firstly. Then the steel casing was inserted, and the three modules of the drilling platform were hoisted to form a stable drilling platform. After these, the modules used for supporting the cofferdam were connected integrally and sunk to the design elevation. Finally, the cofferdam was built by inserting the steel the inner support. This construction technology has features of the convenient installation, high construction reliable quality. Therefore, this construction technology can provide the reference to the similar works. casing along security and
出处
《铁道工程学报》
EI
北大核心
2013年第4期61-67,共7页
Journal of Railway Engineering Society
关键词
武汉二七长江大桥
主塔墩钻孔平台和围堰
模块化
施工技术
桥梁施工
Erqi Yangtze River Bridge in Wuhan
drilling platform and cofferdam for the main pylon
modularization
construction technology
bridge construction
