Drilling pile shaping hole construction technique in supporting pressure water melt of Dangxiong bridge;

The installation of loosen soil teeth added to drilling tools and drilling pipe in anchorage boring construction can enhance treating ability for drilling pipe sticking accident by section reducing and improve the boring efficiency.

The drilling construction experience of mud and sand seam

Combined with the survey and geologic background of concrete project,it introduces the construction preparation,construction method,and construction gradation in the drilling construction in this project,analyzes the reasons generating the common problems in the water-seal process with purdah,and represents the corresponding solving methods in order to ensure the project quality.

In view of difficulties encountered in pile foundation construction process of bridge in Chongyang reservoir,from the erection of working platform,embedment of steel casing,drilling construction and other aspects the construction of pile foundation in deep water and in riverbed without overburden is introduced.