MOVABLE SHUTTER FOR CONCRETING FLOORS Russian patent published in 1997 - IPC

FIELD: civil engineering. SUBSTANCE: shutter has parallel frames with upper and lower lengthwise U-shaped beams interconnected through diagonal struts and vertical props. The frames are interconnected through cross braces. Wall thickness of the U-shaped beams varies across cross section. Lengthwise ledges and recess are there on internal surface of the walls. Crosswise beams are secured to upper lengthwise beams. Each cross beam is made in the form of two channels with walls rigidly interconnected through two partitions to form symmetric troughs to place bars in them. Flat floor is secured to the bars. Vertical props have outer lengthwise ledges and internal lengthwise troughs. Diagonal struts are made of thin-walled hollow profile made in the form of cylindrical shell. Two symmetric U-shaped recesses are arranged along all the length of the shell. EFFECT: higher strength and durability, lower material consumption. 10 cl, 8 dwg