Taking measures as making guide holes in pile sites,embedding PVC tubes in the boulder bed,setting proper jetting pressure,repeating jetting,controlling the quality of cement mortar and jetting quantity and so on,ensured the quality of chemical churning piles in boulder bed and effected the seepage control.

Oriented diameter is a important factor that affects the connect strength of wood and wood-based panel,and by testing WPC screw-holding and its L-type structure,this paper educes the optimization of oriented diameter.

In order to reduce manufacturing progress,a measure how to cut inward oriented hole is introduced.

Optimization of deflector hole for aluminium profile extrusion die;

Preparation of electroplated diamond core bit and its application in drilling overturned hole in the Three-Gorges project;