ZhongJiao Beilay steel bridge and steel structure Design Institute Co., LTD. (ZJ) located in Zhenjiang City, Jiangsu Province. Engaging in professional engineering consulting and design of the fabricated modular steel bridges (temporary bridges) to meet fabricated steel structure engineering application needs for domestic and international users.

The world wide use of Bailey Bridge that is portable steel bridge have been widely used all over the world. The first Bailey Bridge wae designed by the British engineer named Donald Bailey early in the World War II in 1939. His design concept is to use a small range of component units to assembled a steel bridge which can carry heavy traffic loads and overcome different spans. The component units can be transported by the medium-sized trucks available and to build all manpower only.