Design of the intermediate voltage power system for the 4 000 t crane ship;

The wave-inducedmotion of the crane ship produces large pendulation of hoisted cargo and causesoperation to be suspended.

With the continuous development of shipping, ports functions of the growing, Floating crane become one focus of China shipbuilding, especially the demand for medium and large tonnage floating crane.

The 400-t capacity fully swing lifting vessel is mainly composed of two major parts of the crane and vessel.

Along with the construction of these two bridges,China Zhongtie Major Bridge Engineering Group has realized a leap of bridge construction from inland Changjiang River to sea,and therefore started a journey of development of the equipment for marine engineering vessels,including those of the "Little Swan" and "Tianyi" lifting vessels for both girder transportation and .

To cater for the need of marine transportation and erection of the full-span, 70 m long precast prestressed concrete box girders of Hangzhou Bay Bridge, a 3 000-t lifting vessel specially for the said purpose is designed and built.

Concerning the installation of the top prefabricated components of wide-platform wharf,due to the long outreach and heavy components,the requirements to large crane barges turn more and more.