Grid support reinforcement frame for tunnel construction has four parallel running beam bars forming rectangle joined to each other by framework braces in vertical plane and by cross beams in horizontal plane

摘要

The grid support reinforcement frame for tunel construction has four parallel running beam bars (1b) forming a rectangle joined to each other by framework braces (2) in a vertical plane and by cross beams (3) in a horizontal plane. Each framework brace has straight brace parts running in V-formation to each other. The brace parts at one end are joined to one another via a straight or bent bridge. The framework braces abut bluntly without bending on the lower beam bars and are welded (1) to them.