水中裸露基岩地质钻孔灌注桩成孔技术研究

Research on Technology of Geological Bored Pile Forming Hole in Exposed Bedrock in Water

水下裸露基岩地质是在水上桥梁、码头等钻孔灌注桩工程施工中常见的一大重点攻关技术难题。本文针对在不能实行围堰筑岛施工、搭建管桩平台困难的深水水域中施工平台的搭设、护筒的安置及成孔施工技术要点等问题,结合较为典型的浙江省富阳市中埠大桥实例,浅谈了裸露基岩地质情况下有关水上钻孔灌注桩施工技术。并从施工要求、施工效率、环保要求、资源利用、施工进度等方面对该施工技术方案进行了简要的效果评价。

Underwater exposed bedrock geology is a common key technical problem in the construction of bored cast-in-place pile projects such as bridges and wharves on the water.Aiming at the problems of the setting of the construction platform,the placement of the steel casing and the key points of the hole-forming construction technology in the deep waters where the cofferdam construction cannot be implemented and the pipe pile platform is difficult to build.This work combined with a typical example of Zhongbu Bridge in Fuyang City,Zhejiang Province,to briefly discusses the construction technology of bored piles on water under the geological conditions of bare bedrock.Moreover,a brief effect evaluation of the construction technical plan was also made from the aspects of construction requirements,construction efficiency,environmental protection requirements,resource utilization,and construction progress.