The Load On The Trusses After The Erection Of Bailey Bridge

At the beginning, Bailey Bridge was mainly used in the military, and now it has been widely used in rescue and disaster relief, traffic engineering, municipal water conservancy engineering, and dangerous bridge reinforcement. Today, there are a large number of Beret Bridges for disaster relief and urban construction, which have played an important role in earthquake relief materials forward transportation, casualty evacuation and mass evacuation, as well as daily traffic facilitation.

When the truss is subjected to joint load, all the members are subjected to axial tension or pressure; If the load is also carried in the internode of the member, the member will be bent at the same time. The steel truss members are generally thin, and the local bending moment should be avoided or reduced as far as possible when the joints are arranged. For steel trusses with large ratio of height to length, the secondary stress caused by joint rigidity should be considered.

Due to the requirement of out-of-plane stiffness, it is still necessary to connect the upper strings to reduce the out-of-plane calculation length of the upper strings. In the full understanding of the stress characteristics of truss bridge, we can avoid the waste of time in the construction process of Beret Bridge; The purpose of setting the reinforcement chord is to improve the bending ability of the truss and give full play to the shear action of the truss belly rod. The bending moment of the end of the Beret bridge is very small, so there is no need to set the reinforcement chord.

Bailey truss composite gantry crane adopts disassembly type highway steel bridge components to assemble gantry frame, span and column height can be adjusted to meet different task sites; Two elliptical holes are also provided on the channel web at the end of the lower chord for connecting the wind tie rod. Grease around the pin to prevent rain from entering the pin holes. Grease all exposed threads of bolts to prevent rust.