This paper introduces the requirements for the selection of raw materials in the construction of underwater engineering, expounds the performance and design of mix proportion of the tremie concrete, and probes into the reasons of the common accidents of the tremie concrete and the settlement measures.

Taking the extra-long bridge on Bao-Xi Railway across the Yellow River as an example,the 48m girder pre-casting technology,including reinforcement processing,formwork fixing,and concrete casting and curing,is introduced.

This paper provides the methods of concrete pouring and vibrating base on the summary of the constraction experience for many years.

By research on construction key technology, such as the fabriation, installation and concrete pouring of steel tube concrete arch rib of NO.

In this paper,the effects of unfavourahle conditions during rainy season on the construction quality are discussed,such as materials,steel welding and concrete pouring.