In this article,the author introduces some installation technologies of integral steel box girders,such as applying simple equipment to draw across the bridge piers with a winch,and using lifting device to dropped girders into place,which is applicable in practice to installation of structure in large size.

The offshore drilling platform jacking gear is divided into two parts——the electric driving and the hydraulic actuation.

Expounded the structure and application of several kinds of stripper mechanism structure in drawing die for the circular drawing parts, introduces the designing method of the claw, which are the most important elements of the stripper mechanism.