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.

Through the drilling machine types used in a certain bored pile construction in Fuzhou,this article makes a simple introduction about the drilling machine,and chiefly discussed the problems and their causes in construction.

Through the analysis of the topographical features of karst region,problems in cast-in-place pile construction there and the countermeasures are presented in this article to the bridge design,construction and supervision units for reference.

The Stability Analysis of the Drill Construction Platform;

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.