Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Stress-wave analysis of large steel pipe piles and construction of underwater pile caps for bridge piers
K. Fujita Science University of Tokyo, Japan Y.Fuse Kansai International Airport Co. Ltd, Japan Y. Yamaguchi, A. Uchida & I. Sandandata Technical Research Institute, HAZAMA Corporation, Japan

For the construction of the piers of the Access Bridge to the Kansai International Airport, large diameter steel pipe piles (1.5m in diameter) were driven into 20m-deep sea bed by diesel pile hammer, and underwater pile cap was constructed by pouring concrete between steel pipe piles and a prefabricated steel shell placed in-situ by a floating crane to form a bridge pier. Driving stresses of a pile were measured by means of "two-point strain measurement". The velocity and penetration of the pile, the soil resistance during pile driving and the driving energy transmitted to the pile were obtained by a stress-wave analysis. It was proved that the analytical method is useful to evaluate the behavior of driving piles. A superplasticizer and an antiwashout agent were mixed with concrete to meet the requirements of placing underwater concrete, such as extrudability, mobility, compactability etc.. According to a series of investigation on the performance of underwater concrete work, the concrete was found to be self-leveling and stronger than expected.

 article #518; publication #37 (IC-1991-IT)