COVERING FROM TRIHEDRAL TRUSSES Russian patent published in 2002 - IPC

FIELD: construction industry, supporting metal structures of ceiling of industrial and public buildings. SUBSTANCE: each individual trihedral truss of ceiling comprises two upper box- shaped flanges and one lower box-shaped flange interjoined by cross web. All box- shaped flanges have pentagonal section and are made of channel and angle piece rigidly interconnected. Cross web is assembled from single angle pieces attached with shoulders to shoulders of flanges. Walls of channels of upper flange are arranged vertically and wall of lower channel is placed horizontally. Upper flanges are interjoined over shoulders by means of flooring. Values of moment of resistance and radius of inertia of pentagonal section rise due to vertical orientation of walls of channels of upper flanges. EFFECT: increased supporting capacity of trihedral truss, reduced number of members in ceiling. 3 dwg