Patent ID: 6386550
Filing Date: 2002-05-14
Classification: E02D,E03F,E04G,F16L,Y10S

Abstract:
A coupler for casting in a concrete wall of a subterranean vessel, the wall having a reinforcing grid, the coupler being for receiving a pipe therethrough and comprising:a cylindrical wall having first and second ends, an outer surface and an inner surface defining a passageway extending between said first and second ends for receiving the pipe; a plurality of circumferentially-spaced engagement members extending radially from said outer surface and being releasably engageable with grid members of the reinforcing grid to mount the cylindrical wall to the reinforcing grid prior to casting; and a seal membrane integrally formed across said cylindrical wall between said first and second ends thereby sealing the passageway, the seal membrane having a circular portion which is removable to provide an aperture for slidably receiving a pipe therethrough.