Well structure comprises grooves having vertical supporting ribs between top and bottom for transferring forces applied on lid to underground

摘要

Groove (1) has bearing side (2) at bottom, and access opening (3) at top, surrounded by support (4) for lid. Groove has stabilizing ribs (6) spreading circumferentially across groove. Groove also has fittings (8) where conduits can be attached. V-shaped vertical supporting ribs (9) are placed between bottom and top support so as to transfer forces applied on lid to underground.