STRUCTURE OF UNDERGROUND MULTI-PURPOSE DUCT FOR LAYING ELECTRIC WIRE

PURPOSE: To provide the structure of a underground multi-purpose duct for laying electric wires where the duct can be easily and accurately aligned and the electric wires can be easily laid. CONSTITUTION: A plurality of unit pipe bodies 1a and 1b are connected in longitudinal direction for forming an underground multi-purpose duct and an electric wire is laid in the duct. A flange 8 is arranged on the outer surface of both edge parts of the unit pipe bodies 1a and 1b, a small-diameter insertion part is formed at one edge of the unit pipe bodies 1a and 1b and a part projecting from a flange mounting part is formed, the insertion part is engaged to the inner surface of the edge part of the facing unit pipe body, and the flanges 8 which face each other are connected by bolts.