The RFT1 Linkspan Bridge operated using a counterweight system housed within two towers on either side of the structure. Each tower contained two suspended concrete counterweights—one approximately 25 tonnes and the other 12.5 tonnes—connected to the bridge via a cable and pulley system. Due to the deteriorated condition of the overall structure, the bridge was scheduled for full dismantling. This required safely transferring the bridge load onto new foundation beams, releasing the counterweights from the pulley system, and lowering them onto the concrete slab before removing the remaining steelwork. The complexity of the task demanded a highly controlled and independently supported lifting and lowering system.

  • Customer/Owner:
    CentrePort Wellington
  • Engineer
    Worley Parsons
  • Works period
    September 2017 - September 2017

Freyssinet Scope

  • Design, supply, and execution of a complete counterweight‑lowering methodology
  • Installation of independent propping towers within restricted tower spaces
  • Placement of header beams above counterweights for load transfer
  • Installation of transverse beams beneath counterweights
  • Load transfer using Ø26.5 mm, 1030 MPa Freyssibars
  • Controlled lowering of 25‑tonne and 12.5‑tonne counterweights using hollow jacks
  • Extension of propping towers to 8 m to repeat operations for upper weights
  • Full duplication of the process in the second tower
  • Safe completion of all works through meticulous planning and execution
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