Taking the construction of a certain bridge\'s deep-pile foundation as the example,this paper expounds the construction techniques for the bridge\'s deep-pile foundation in soft ground,and introduces its control factors for the workstage and technique,the allocation of its construction equipment,and the prevention and treatment of the accidents,etc.

In light of the technical difficulties existed in deepwater large-diameter super-long group piles foundation,the article discusses the mechanism of improving the pile end s bearing capacity by pile bottom grouting,introduces the technology,materials and construction process of pile bottom grouting,and analyzes its effect,in order to promote the application of pile bottom post-grouting technology.