PRE-STRESSED TRUSSED BEAM Russian patent published in 2001 - IPC

FIELD: construction engineering; coverings of buildings and structures. SUBSTANCE: pre-stressed trussed beam has spacer bar, main truss, top and bottom flexible tie bars with tensioning devices, posts with guides for passing flexible tie bars, and coupling members for joining posts within its external dimensions. Truss beam is provided with additional paired trusses including flexible tie bars with tensioning devices and locking members passed through guides in posts of main truss and fixed near beam supports and at points of maximal cross deformations of purlin. EFFECT: enhanced strength and stability under nonequilibrium loads; reduced metal input. 2 dwg