Closure for connections in concrete constructions

摘要

The protective box structures with a hollow box or rail shape, for the connections to join concrete sections together, have a box and a closure (1) to shut off one or both open sides of the box.. The closure has the configuration giving the shape and dimensions to be inserted into the box in a positive fit with a friction lock. The closure has a stopper plate (2) to cover the open end of the box/rail, in one piece with a shaft (3), which fits within the hollow box/rail. The side surfaces (4) of the closing plate are aligned at an inward angle to the shaft, with sealing surfaces (4.1,4.2).