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OTIRA VIADUCT

Officially Opened

The Otira Viaduct had it's official opening on Saturday 6th November, 1999. The Official Opening was carried out by The Rt. Honourable Jenny Shipley Prime Minister, and Ed Evans Snr.

WHY THE VIADUCT HAS BEEN BUILT...

Major Rockfall hazard above and below the existing road (the zig zag) threatens to destroy it, or at least undermine it to a point where it is not repairable.

FACTORS THAT AFFECTED CONSTRUCTION...

HAZARDS

  • Major rockfalls from above
  • Located in an active seismic region (small earthquakes from time to time)
  • Riverbed scour from the Otira River
  • Otira River flooding (max. 5cu.m/second)

ENVIRONMENT

  • In Arthur's Pass National Park
  • Minimise disturbance to vegetation
  • Blend structure with natural contours
  • Protection of cultural features

CONSTRUCTION STATISTICS...

VIADUCT

  • Total Length 440 metres
  • Maximum Span134 metres
  • No. of Spans 4
  • Road Width 8 metres
  • Gradient 11.7%
  • Pier Height 35 metres
  • Pier Foundations 25 metres deep
  • Pier Dimension 4m x 3.5m
  • Stressing Strands 3150 metres
  • Concrete Volume 5,000 cu.metres
  • Construction Method - Balanced Cantilever
  • Superstructure Form - Post Tensioned Concrete Box Girder

NORTH GULLY BRIDGE

  • Total Length 30 metres
  • No. of Spans 2
  • Gradient 12%
  • Construction Method - Precast prestressed concrete

EARTHWORKS Total Volume 80,000 cu. metres

PROJECT DETAILS

CONTRACTOR McConnell Smith Ltd
TOTAL COST $25,000,000 (on budget)
WORK BEGAN February 1997
COMPLETION November 1999
Otira Viaduct opened by Prime Minister, Jenny Shipley
Otira Viaduct balanced cantilever construction
Otira Viaduct and old zig zag road
Otira Viaduct
Death's Corner Lookout Kea
Otira Viaduct - Box girder construction Otira Viaduct

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