摘要
Abstract
This paper introduces the successful construction experiences of the foundations of two main pylon piers of Anqing Yangtze River Bridge in Nanjing-Anqing Railway under the conditions of 40 m deep water and torrential water flow during flood season. Every foundation is made of 37 drilled piles embedded into mudstone 97 m deep with 3. 4 m/3. 0 m variable diameters, and every pile cap is 8m thick with 51m diameter. The foundation is constructed within supportless double-wall steel-boxed cofferdam with 56m outer diameter, 2 m wall thickness, 42. 88 m and 41. 4 m height respectively, so as to form the integration of the cofferdam and platform. Then, the successful experiences of several key techniques are summarized for the construction of supportless double-wall steel-boxed cofferdam in deep water, such as the accurate positioning of cofferdam by anchor system without guide ship, the treatment of cofferdam bottom, the resolving of quicksand and collapse at pile-casing bottom, the drilling method with clear water for drilling pipe of lager and variable diameter, and the concreting method of mass concrete with 31 m altitude difference.关键词
主塔墩/深水基础/施工Key words
main pylon pier/ deep water foundation/ construction分类
交通工程
