The era has given it different structural features for the Bailey bridge

For the Bailey bridge, the era has given it different structural features, the Berley bridge, the lower chord, the pole and the oblique rod are welded on the lower chord, the cathog joint at the end, and the truss connecting pin hole of the joint. Bailey chords are composed of 10 channels (back-to-back) combinations, in the lower chord, welded multiple plate round holes on the upper and lower chords, supply and strengthen chords and double truss connection bolt holes, on the chord is also used to connect the frame four bolt holes, holes in double rows or multiple truss internode connections. 2 holes with cross-section at both ends. When multi-row or columnberry is used as beams, the Beret trusses that frame the upper and lower joints used for reinforcement must be supported.

In the lower chord, 4 pieces of beam plates, upper mortise, fixed beam in the plane upper and lower chord positions, at the end of the channel the steel mesh also also oval hole connecting rod, wind. The vertical rod of Bailey consists of the square holes on the upper and lower chord sides of the pole are used for beam fixtures to fix the beam. Bailey material is steel plate, 270kg per frame. “321” is an assembled highway steel bridge, its main characteristics are: light elements, easy to disassemble and assemble, strong adaptability, using simple tools and humans can be quickly established. Suitable for cars – 10, – 15, – 20, – 50, – 80 tracks, with other 5 types of loading and unloading trailers. The width of the bridge carriageway is 3.7 million, and it is combined into a multi-span simple supported girder bridge and a continuous girder bridge structure in the distance of 9 million to 63 million.