METHOD FOR INSTALLING WATERPROOF SHEET ON CAST IN SITU DIAPHRAGM WALL

PURPOSE:To install a waterproof sheet in the water stop condition with fittings at the same time when a reinforcing bar basket is installed. CONSTITUTION:A waterproof sheet 8 is installed to a side hardware 7 disposed at the side edge of right and left fittings 2, 2 at the outside of a leading element wall body 6 of an underground structure, the sheet adhering at the right and left edges beforehand. The waterproof sheet 8 is put into an excavated groove 1 integrally with the fitting 2, 2 at the same time when the fittings 2, 2 are installed Between the right and left fittings 2, 2 in an excavated groove 1', a reinforcing bar basket 9, in which a vertically long guide side frame 11 disposed at the right, and left edges of waterproof sheet 12 is installed in such a manner as to move back and forth and right and left, is installed at the right and left ends of external surface positioning at the outside of trailing element wall body 10 of an underground structured. When the reinforcing bar basket 9 is installed, the guide side frame 11 is put into the excavated groove 1' together with the waterproof sheet while connecting via side hardware 7' disposed at the side edge of fitting 2, 2 and a cut-off joint 15.