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.

In this article, based on the problems in the use of the film dropping evaporation equipment and with RNJM03-4200 third Film Dropping Evaporation Equipment as the example, one method of appropriate disposition of the vacuum device was introduced.

The vacuum device for three-effect and four-compartment evaporation process of diaphragm caustic soda was transformed,which reserved the water jet condensers and added a combined vacuum device of a surface condenser and a vucuum pump.