Joint for corrugated pipe

Abstract

A joint (and method) connects synthetic resin corrugated pipes, each of the corrugated pipes including a pipe wall having sectionally rectangular wall portions and sectionally circular wall portions disposed alternately in a longitudinal direction of the corrugated pipe. The sectionally circular wall portions each include an annular-shaped protrusion projecting outwardly from the sectionally circular wall portions disposed substantially at a center of the sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction. The joint includes a pair of semicircular-shaped joint main bodies coupled with each other by bolts, each having a recessed groove defined by both of its side edge portions in a width direction thereof and also having tightening bolt holes respectively formed at both peripheral end portions in a peripheral direction thereof, and a pair of watertight packings respectively formed of elastic material and respectively received in the recessed grooves of the semicircular-shaped joint main bodies, each of the watertight packings having a semicircular portion which includes two edge portions disposed at two end portions in a width direction thereof, and a projecting portion disposed between the two edge portions in the width direction and inwardly projected in a radial direction of the pipe.