裸岩河床深水基础先堰后桩法钻孔平台设计与施工技术

Design and Construction Technique of Drilling Platform with Weir Before Pile for Deep-Water Foundation of Naked Rock Riverbed

水中钻孔平台是保证深水基础施工顺利的关键,钻孔平台搭设需结合深水基础河床地质、水文、钢围堰结构及桩基施工工艺综合考虑,其强度、刚度及稳定性必须满足要求。文章结合南龙铁路闽江特大桥主墩深水基础施工实例,介绍裸岩河床深水基础采用先堰后桩法施工的钻孔平台设计与施工技术,重点介绍钻孔平台的设计、施工工艺、安全质量控制关键点,为类似工程施工提供参考。

The drilling platform in the water is the key to ensure the smooth construction of deep-water foundation,the drilling platform construction needs to combine the deep-water foundation riverbed geology,hydrology,steel cofferdam structure and the strength,stiffness and stability of pile foundation must meet the requirements when the construction technology is considered comprehensively.Combined with the construction example of the deep-water foundation of the main pier of minjiang river bridge of nanlong railway.This paper introduces the design and construction technology of drilling platform for the deep-water foundation of naked rock riverbed constructed by weir before pile,with emphasis on the design,construction technology and safety quality of drilling platform.The key point of quantity control provides reference for similar engineering construction.