Project: Thames Barrier


In accordance with the Environment Agency National Contractors Framework version 2 and in association with Volker Stevin, Qualter Hall were awarded this major contract for work on the Thames Barrier.

The project consisted of two elements:-

  • A gate load matching control (LMC) system complete with new hydraulic pump setsfor a Gate Arm Synchronisation (GAS) Pilot Trial on piers Three and Four for gate Golf.
  • Refurbishment of the shift and latch arms on pier Seven for gates Charlie and Delta,¬†complete with new hydraulic power packs.

The GAS pilot trial required the introduction of new hydraulic power units and a load balancing control system which had to be compatible with the existing retained systems. The performance of the new system was tested over the full operating range and modes of the barrier. The system was trialled for six months under normal gate operations to prove the new hydraulics package and control system. Operator training took place during this period.

The shift and latch arm mechanisms were installed some 30 years previously and required a full mechanical strip-down, inspection and refurbishment. New hydraulic power packs were also designed, installed and commissioned as part of the refurbishment.

Client: Volker Stevin/Environment Agency