In the tunnel construction, with steel arch, steel grille, steel support, which is what mean? What is the use of high reward?!
Steel grille is a arch, the main difference is the steel grid by rebar welding assembly, looks like a cage, commonly known as flower arch
That role is to enhance the stability of the structure. The steel support there is a kind of special form of steel support called steel arch.
Supporting the general situation is the tilt of the connection components, the most common is the shape and cross shape of the cross section of the steel pipe
