Transfo diving tankZwevegem

What was the customer’s request?

The basic design comprised the construction of underpinning by means of shored trenches under an existing classified steel tank, with the intention of realising a 2.64-metre excavation inside the tank.

What technical challenges did the project pose?

The biggest challenge was that the activities had to be carried out under an existing classified steel tank, which only had a rubble foundation.

Secondly, the activities around the tank had to be carried out with a minimal amount of free space.

How did CVR tackle it?

Considering that underpinning is a relatively expensive and time-consuming technique, CVR suggested realising the earth-retaining structure and the deepening of the foundations with a CVR C-MIX® pile wall. We worked out this proposal together with the main contractor, and submitted it for approval to the management.

With a view to considerable savings and a significantly shorter execution period, the alternative execution method was accepted by the management.

What was the end result?

CVR bored a Ø 63-cm soil mix pile wall with 58 cm of spacing and a total length of 88 metres under the entire circumference of the steel tank. On completion of our activities, the main contractor was able to realise a 2.64-metre excavation inside the tank.