Removable full wall support for tunnel construction; has flanges to form triangle or square with connecting bars formed so that they can be separated in trapezoid or curved shape and having openings

摘要

The support has three or four parallel flanges to form a triangle or square. The flanges have connecting bars, which are formed so that they can be separated in a trapezoid or curved shape using wide-flanged, rail or special profile supports, and are welded together. Trapezoid or oval openings are formed in the bars. Two full wall supports are welded together in the upper flange area in a V-shape. The supports are welded together with the peaks of one bar next to the troughs of the other bar