Intersecting-tubular-arm shuttering board frame - with arms and projecting arm end sockets cut at 45 degrees angles and welded

摘要

The shuttering board frame is made up from tubular arms which intersect one another and are interconnected at the points of contact in such a way as to be undetachable with their open ends projecting beyond the intersections and perforated for the insertion of bars as in 557463. At the intersection points the tubular arms (1, ) lying in a single common plane, and the tube sockets formed by the projecting tubular arm ends (4 5) are cut in symmetrical planes vertical to the tubular arms' common plane, at angles of 45 deg. relative to the tube axes, and they are welded to each other at the junction points. This is universally applicable, and has a high degree of mechanical stability.