Cleaning pipe concreted into ground - has standing surface round shaft as base for formwork shaft pipe

摘要

The shaft gives access to the cleaning shaft for the pipe when the cleaning pipe is sunk in the ground. Use is made of a standing surface (14), threaded onto the cleaning shaft (3) and gripping it, and supportable on it and/or on the pipe body (2). This serves as base and bottom closure for a shuttering shaft pipe (15) inserted in the ground, if appropriate as lost formwork. The standing surface may be in the form of a first collar slid over the cleaning shaft, with an inner opening, the latter being slightly wider than the shaft periphery.