COUPLING AND LAYING METHOD FOR SIDE DITCH WITH SLIT

摘要

PROBLEM TO BE SOLVED: To provide a coupling and laying method for a side ditch with slit, by reducing the manufacturing cost to decrease the amount of concrete to be used by making a thin wall at both the side surfaces of a side ditch, the slit formed has a sufficient strength against breakage and the weight can be reduced so that the work can be made easier during transport and laying, also the coupling and laying work for the side ditch with slit can be performed more easily, and the slit communicated will not deviate, after the coupling and laying work. ;SOLUTION: A square columnar shape is formed, a hollow drain passage 2 is provided in the center of the axis direction, a slit 3 communicating the drain passage 2 to the outside is provided in the top wall, both the side surfaces are made to thin- walled side surfaces, the slit 3 is formed to a taper shape toward the tip from the drain passage 2 to the external, external side is chamfered, and wedge-shaped clearance holding device 4 is attached freely detachably, the coupling surfaces of the side ditches 1 are brought into contact with each other, slits of both the side ditches are aligned, and the wedge-shaped clearance holding device also functioning as a coupling deviation prevention device 7 is fitted to the inside of the slits 3 which straddle to both the coupling surfaces.;COPYRIGHT: (C)2001,JPO