铁路大桥基础加固嵌岩钻孔灌注桩的施工

Construction of Cast-in-place Pile Inserted in the Bedrock for Railway Bridge Foundation Reinforcement

摘要:

在丰沙铁路线35号桥桥墩基础加固工程中，根据行车铁路大桥对钻孔灌注桩施工的机械震动和裸孔量的技术要求，确定了采用回转式钻孔工法和施工顺序。根据工程地质条件确定采用双液压浆造壁及锥底滚刀钻头钻进成孔的关键工艺，解决了老桥基钻遇各种障碍物的判断和顺利钻透的难题，采用优质高粘度泥浆护壁除渣，取得了良好的工程效果。

Abstract:

In the reinforcement for a bridge pier foundation, rotary drilling method and its construction order were taken according to the technical specification of mechanical vibration and the amount of open hole. And according to the engineering geology conditions, the key technology, wall-building by pressure grouting with two phase liquid, hole completion by drilling with cone-base roller bit and high quality, high viscosity slurry, were adopted to get good result.