溶洞群地层桥梁钻孔桩施工技术

随着我国经济发展和运输需求增强,溶洞地区修建桥梁日益增多.在溶洞地区修建桥梁,溶洞的处理是其施工的重点和难点.梅花店特大桥溶洞孔隙发育,极不规则,多数为松散角砾及砂黏土充填,局部为未充填空洞,存在连通现象.该地层为国内罕见的不良地质,施工难度极大.本文结合该溶洞群地层桥梁钻孔桩施工成功实践,通过施工方案比选,详细阐述了...

Construction technology of bored pile for bridge in karst cave group stratum

With the development of China's economy and the increasing demand for transportation,the construction of bridges in karst cave areas is increasing.In karst cave area,the treatment of karst cave is always the focus and difficulty of bridge construction.The karst caves of the Meihuadian bridge are developed with irregular pores,most of which are filled with fault rubble and sand clay,some of which are unfilled cavities,so there are connections between them.This stratum is a rare unfavorable geology in China,which is very difficult to construct.Based on the successful bridge construction project of bored piles in the karst cave group and through comparison and selection of construction plans,this paper expounded drilling construction preparation,overburden construction,bedrock and karst cave drilling,karst cave treatment and treatment for drilling accident,hole collapse accidents and other accidents in the construction of bridge bored pile in karst cave group stratum,which provided the reference for solving the construction of bored pile in karst cave stratum.