THREE-DIMENSIONAL COVERING UNIT Russian patent published in 1998 - IPC

FIELD: construction engineering. SUBSTANCE: this is intended for use in civil buildings and structures having rectangular pattern of columns, for example 12x18, 24, 30, etc. Three-dimensional covering unit has three-dimensional trusses, profiled decking and raft structures. Unit is made up of three-dimensional trusses of equilateral triangle cross-section. Upper girth is divided into panels of dimensions decreasing in geometrical progression in direction away from supports. Spread struts are parallel to above-support struts. Truss members are made of steel equal-flange angular profile created by flanges and circular segment. Flanges are located at angle of 60 deg. Value of circular segment radius is equal to R = , where m > 2, b_f- width of flange, n > 10 - flexibility of flange. Trusses are made with pitch equal to double width of truss face. Resting of profiled decking is made according to unsplittable equal-span scheme. Alternately, lower girth of trusses can be made of two butt-joined profiles with their free flanges creating unfolded angle equal to 180 deg. Three-dimensional trusses are made of steel angular profile stock differing from others by form of lateral cross-section. Geometrical form of three-dimensional truss differs by its geometrical dimensions and relative location of components. Aforesaid covering unit cuts amount of metal needed and increases rigidity of covering shell. EFFECT: higher efficiency. 1 cl, 3 dwg