| 摘要 |
FIELD: building, particularly for erecting light-weight roof frames, arches, bearers and similar structures. ^ SUBSTANCE: lattice structure includes upper and lower girders connected one to another by rods of triangular lattice. Lattice rods are pressure formed of steel strip by bending parts thereof into opposite directions along two parallel fold lines for flanges forming and butt-joining thereof across girders cross-sections. Strip has cut formed in opposite folded flanges and extending from strip length center to outer edges thereof. Cut creates symmetrical triangle profiles of each flange. ^ EFFECT: reduced material consumption. ^ 3 dwg |
