The Taita Reservoir in Upper Hutt, Wellington, is a 34‑metre‑diameter concrete water tank standing 7.2 metres high with a dome roof. Due to significant deterioration and major leakage, the structure required seismic strengthening to ensure long‑term performance and water‑tightness. Strengthening works focused on installing an external post‑tensioning system to enhance the tank’s structural capacity and resilience.

  • Customer/Owner:
    Wellington Water
  • Engineer
    WSP Opus
  • Works period
    April 2019 - June 2019

Freyssinet Scope

  • Installation of 10 Freyssinet 1×15 external prestressing anchorages
  • Supply and installation of 1,100 m of greased and sheathed Ø15.7 mm galvanised strands (279 kN minimum breaking load)
  • Installation of 1,100 m of HDPE duct
  • Full tendon grouting and stressing using monostrand jacks
  • Greasing of all anchorages to provide long‑term corrosion protection
  • Surface preparation including levelling and smoothing of tank surfaces prior to installation
  • Works completed safely, on time, and within budget

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