MEMBER FOR REPAIRING METALWORK BEAM Russian patent published in 1994 - IPC

FIELD: repair and restoration of metalworks. SUBSTANCE: member is designed for repairing T-, I- and box-shaped beams with crack-like defects. For this purpose strengthening strap made in the form of ellipse-shaped sectorial plate with sector angle equal to 180^°≅ α ≅ 270^° is placed on crack. Long half-axis of plate is determined from formula 350-500 ≅R_l≅(2/3-3/4)H_w and its short axis is determined from formula 250-300≅R_sh=(l_cr+20)+(120-150)·H_w/2 , where H_w is height of beam wall, m; l_cr is maximum length of crack, mm. Plate is positioned on beam wall so that vertex of sector angle be agreed with beginning of crack and its bisectrix be matched with short axis of plate. Sectorial plate may have ellipse-shaped recess with its center coinciding with vertex of sector angle. In this case long and short half-axes are determined with the aid of relations 50≅r_sh≅ 75 mm и 85 ≅r_l≅ 100 mm , where r_l is long half-axis and r_sh is short half-axis in mm. Sectorial plate may be made with recess in the shape of circle sector with radius of 50 to 75 mm and center of sector coinciding with vertex of sectorial plate angle. EFFECT: enhanced efficiency and improved reliability of repair. 3 cl, 3 dwg