It introduces the conception and application dimension of the DX multiple-unit broaching concrete caisson pile and CFG pile,represents the composition,technical principle and natural feature of the DX foundation and CFG foundation,which will accelerate the pile foundation technique and foundation treatment technique development.

With the example of the administrative building works in Cixi People s Hospital, the workmanship for construction of the in-situ concrete pile with extruded tray support is introduced hereby, and based on engineering practice, key points are summed up for monitoring the construction quality and tray formation.

This article describes the features of DX piles and summarized the advantages and disadvantages of these piles from the application of them to the pile foundation of highway bridges in Hebei Province.

Quality control of manual digging concrete pile;

The construction perfusion principle of underwater concrete delivery of bored piles was analysed.