How Many Changes Can Be Made To The Main Beam Truss Combination Of Baileysteel Bridge?

The assembled highway steel bridge (Bailey bridge, Bailey bridge, steel bridge) is composed of main beam trusses (Bailey plate, Bailey frame), bridge floor system, supporting parts, bridge end members and erection tools.
The main beam truss components are: truss (Bailey sheet, Bailey frame), truss connection pin and safety pin, strengthening chord, chord bolt, truss bolt 6 components.
According to the different structural design, Beret bridge can be divided into: upper bearing type and lower bearing type.
In order to adapt to the changes of different loads and spans, the truss combination can be changed in 10 kinds of corresponding changes, that is, single row single layer (SS), double row single layer (DS), three row single layer (TS), double row double layer (DD), three row double layer (TD), and five forms of strengthening strings on the upper and lower strings of the above five combinations. When a stiffening chord is added, it is usually preceded by the word "stiffening" (adding an "R" when used in English), for example, "three-row single-layer stiffening (TSR)".