Manhole renovation

When pipelines are renovated, it makes sense to renovate the inspection manholes as well, so that the whole system becomes watertight. Old concrete manholes can be made watertight in two ways.

1. Building a PE pipe manhole inside the reinforced concrete manhole.

The work is carried out on site using an extrusion welder. The gap between the new and old manhole shafts is filled with either sand or concrete. With this method, the diameter of the manhole is reduced.

2. Sprayed concrete technology

Specialist mixes can be used to line existing manholes from the inside. This method requires the concrete manhole to be structurally intact or to need only minor repairs. The materials used are specialist mixes and mastics manufactured in Germany and England.