Hydraulic pile hammers have a lot of advantages over the cylindrical diesel pile hammers and should be given necessary importance.

Based on many years experience in pile testing and inspection,the author has made a summary of the information and data on piles,geological conditions and pile hammers used for the construction of marine works in Guangdong region,thus giving a reference table for piling operations in marine works,which may be of referential significance for piling operators.

Hydro-pneumatic driving system of new type hydraulic pile hammer;

Thehydraulic pile hammer (HPH) is one of the pile-driving machineries forarchitectural applications.

This paper introduced some problems in prestressed concrete pipe-pile construction—selection of pile hammer,the difference and relation between static pressure and bearing capacity of single pile,effect of pushing against soil and prevention measure,aging effect and the limitation time of the bearing test,foundation excavation.

Through concrete example of engineering accidents, this paper analyzes the reasons of fragment splitting and break of pilework of common reinforced concrete pre-pile from aspects of selection of pile hammer, shock stress, design of pile top and detail structure of the pile, and discusses the concrete method of filling pile.