Safe working in manholes – safe opening and access
Manholes fulfil an important task in water supply and wastewater disposal. They are used for example where shut-off fittings in pipelines must be accessible, or to control sections of very long pipelines, and for aeration/deaeration or access to complex installations (e.g. well shafts, pressure reduction shafts).
Easy and safe access must be ensured in each individual application.
Most of the manholes are entered from the top. This means that the operating personnel must open the manhole cover in order to then be able to use an entrance aid for safe access. They must move over the manhole opening already when opening the cover.