Lättbalk i form av en I-balk av tunnplåt

摘要

I-beam of thin sheet plate folded so that the flanges (102) of the beam (101) consist of two layers of plate laid on one another and that the mid-section (103) of the beam consists of a single layer of plate. It is distinguished in that the two layers of plate that are laid on one another in the flange are firmly attached to one another by means of holes (104) or rivets punched through both plates.