铁道标准设计2017，Vol.61Issue(9)：68-75,8.DOI:10.13238/j.issn.1004-2954.2017.09.016
平潭海峡公铁两用大桥航道桥基础设计与施工创新技术
Innovative Technology in Channel Bridge Foundation Design and Construction of Pingtan Strait Hi-Rail Bridge
摘要
Abstract
Pingtan Strait combined highway and railway bridge is the first cross-sea hi/rail bridge in China.In the sea area where the bridge is located with strong wind,high waves,deep water,rip current and apparent tides.In addition,the rock surface inclination fluctuates greatly,exposed rock/hard rock spreads extensively,meteorological,hydrological and geological conditions are all very complicated,especially in the sea area where the bridge is located with huge wave-current force,and all these make the design and construction of the bridge substructure unexpectedly difficult.In order to solve the wind/wave action and ship impacting force action when navigation is proceeding,multi-innovative technologies are adopted during foundation design and construction of three large-span navigable cable-stayed bridges,and drilled piles of 4.5 m diameter are used for the first time.Type KTY 5000 power head drilling machine and relevant pile-driving equipment are studied and developed to solve the problems in drilled piles construction in complicated sea areas.Construction platforms supported by jackets frames are built in some deep water exposed rock areas to overcome the wave force action.In order to adapt to the unique environment in the bridge location,dumb-bell type high pile caps are used on the main tower pier caps of the three large-span cable-stayed bridges to allow the cap top above high tide level.During cap construction,the main body anti-collision structure is integrated with construction cofferdam and the permanent structure is combined with the temporary structure,which not only save materials,but also reduce construction safety risks.The large scale collision protection box cofferdam is manufactured completely in plant and handled wholly to fulfill modular and standardized construction.Innovative technology of concreting without bottom cover is applied in dumb-bell type cap beam construction.关键词
公铁两用桥/航道桥/基础设计/施工创新技术/波浪力/导管架/大直径钻孔桩/防撞围堰Key words
Combined highway and railway bridge/Channel bridge/Foundation design/Innovative construction technology/Wave force/Jacket frame/Drilled piles with large diameter/Collision protection cofferdam分类
交通工程引用本文复制引用
王东辉..平潭海峡公铁两用大桥航道桥基础设计与施工创新技术[J].铁道标准设计,2017,61(9):68-75,8.基金项目
中国铁路总公司科技研究开发计划项目(2014 G004-D) （2014 G004-D）
