Basing on the action of the explosion shock wave,this paper researches from theory and experiment data aspects that the initial coagulating time of the pouring concrete construction is effected by the explosion on the construction face in the cace of the permanent pouring concrete support following closely the construction face in shafts, galleries,and tunnels construction.

Complying with the cast-in-place concrete structure projects,there are a great variety of forms rapidly developed such as:(1)the composite ganged form,(2)the permanent-equipment and big-series form and (3)the widely adopted plywood(or plybamboo)form.

Classification of cracks in cast-in-situ concrete structure is introduced in this paper.

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.