Bailey Bridge is a fast-assembled bridge designed by the Highway Planning and Design Institute of the Ministry of Communications on the basis of the original British-made Bailey Steel Truss Bridge. It is a decomposable and fast-erecting standard bridge. High-strength steel is fully welded. The main beam is a decomposable light truss. The truss is connected by a single pin. The components are interchangeable and light in weight. It is easy to transport and disassemble. It can also be assembled according to the requirements of span and load. The type of assembled steel bridge is a well-prepared and comprehensive emergency transportation support assembled steel bridge. Applicable to 5 kinds of loads such as automobile-10, automobile-15, automobile-20, crawler-50, and trailer-80.