Inventors:
James R. Sims - Pittsburgh PA
Jeffrey N. Carr - Toronto, CA
Assignee:
Camtek Construction Products Corporation - Murrysville PA
International Classification:
E02D 2912
Abstract:
A manhole insert wherein gusset (58,60) and (62,64) or offset sections (142,144) and (146,148) anchor pins (94,96) or (158,160) that can be grappled with tools (not shown) to remove the insert. The bottom of the insert includes a conical frustum (40) and an inverted cone (48) or a panel that has a convex inner surface.