THROUGH JOIST Russian patent published in 2010 - IPC E04C3/08 

FIELD: construction.

SUBSTANCE: through joist comprises upper belt, lower belt and braces. Upper belt is arranged of two channels that face each other with walls. Lower belt has triangular contour. Braces are made of channel bar arranged between profiles of upper belt and attached to them with an overlap on bolts with their shelves. Lower belt is arranged of strips. Strips in support unit of joist via insert are attached to walls of belt channel bars. Strips in the middle of their length are tightened with each other. In lower span unit of joist ends of strips are opened and overlapped in pairs on shelves of bracing channels. Gap between channel bars of upper belt on support is less than in span.

EFFECT: reduced labour intensiveness of manufacturing and increased bearing capacity of joist upper belt.

3 dwg