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Bridge Strengthening

Bridge & Culvert Strengthening:

Following the HPMV Evaluation in accordance with the NZTA Bridge Manual of twenty (20) bridge and culvert structures on Porangahau & Wimbledon road as part of the Porangahau and Wimbledon Roads PGF Project, a total of eight (8) structures have been identified as not being capable or carrying full HPMV vehicle loading.

  • Sixty Pound Bridge 175
  • Wallingford Bridge 173
  • Kokomoko Bridge 174
  • Saleyards Bridge 176
  • Kahika Culvert 348
  • North Watermark’s Culvert 352
  • Mckenzie’s Culvert 364

The Porangahau and Wimbledon Road Upgrade will include projects to strengthen these structures to provide future generations with safe and durable roading infrastructure along what is a key thoroughfare in our district.

Bridge inspections and associated High Productivity Motor Vehicle (HPMV) loading assessments have now been completed on all bridges and large culverts on the route.

This resulted in identifying three bridges as not being capable of carrying full class 1 in vehicle loading as they currently stand – these bridges are; 

  • Wallingford Bridge 173
  • Kokomoko Bridge 174
  • Saleyards Bridge 176

A Traffic Management Plan will be developed to implement the restriction of the bridges to a single 3.7m wide central lane with a 10km/h speed restriction in order to keep the road open and safe for use.

The traffic management and width restriction on the bridges will be kept in place until strengthening works of the bridges have been completed.

A monitoring regime will also be out in place for Sixty Pound Bridge 175, Kahika Culvert 348, North Watermark’s Culvert 352, Mckenzie’s Culvert 364 and Kokomoko Bridge. This regime will be developed and implemented accordingly until strengthening design has been completed. This will include inspection of the structures on a regular basis to note any deterioration of the culvert or note any formation of new cracks in the external walls.

To inform the design of the bridges and culverts proposed for replacement geotechnical investigations are underway across our 

Sixty Pound Bridge

IMG 1414

 

Wallingford Bridge

IMG 1343

Mckenzies Culvert

IMG 1324

Bridge inspections and associated High Productivity Motor Vehicle (HPMV) loading assessments were completed on all bridges and large culverts on the route. This resulted in identifying four bridges and seven culverts requiring strengthening to lift the capacity to allow the HPMV traffic.

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