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Hydraulic climbing circular wall formwork
Project // United Kingdom

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Formwork for a circular drink water tank

The tank is made as a caisson, it is sunk by its own weight and continuous excavation inside the tank. The tank drops systematically as the soil is removed and the wall is poured.

Due to repetition and future similar works it was decided to use customised round formwork of which the inside can retract and climb hydraulically. This automatic climbing avoids the need to use a crane and thus keep the opening of the tank free for the removal of soil from inside.

Execution details:

  • Inner diameter 20m, wall thickness 800mm, height 26,5m
  • Full circumference inside and outside formwork, poured in 1 go, height 2m
  • Partitioning wall between dry and wet part of the tank is poured afterwards
  • A 1m starter is cast on both ends of the partitioning wall in phase 1