This paper introduces the principle of risk source identification and the partition standard of the risk levels, probes into the risk source identification and the partition of the risk levels in the construction of caisson engineering, and advances the emergency response plan for the risks.

Quality control analysis of large diameter manual excavation pile body;

The application of manual excavation pile in some big-scale work;

Technical Treatment to Several Special Aspects of Manual Excavation Pile;

Discussion on the calculation models of the manual hole digging pile wall protection;

The application of the method combined with manual hole digging pile and steel pipe pile in quicksand formation;

How to do wall artificial digging pile project;

Quality control of artificial digging pile in Jiashun international plaza;

The construction technology of manual digging pile of aquifer;

Construction security control measures for manual digging pile;

Supervision and control work of manual digging pile construction;

Boring technology of hand-dug pileat in complex geologic founadtion;

For the increase of digging footage of hand-dug pile,different arrangement of pile holes and insitu tests of explosive are carried.

The behaviors of granite residual clay and its effects on the bearing capacity of hand-dug piles were expounded in this paper.