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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.

Strengthening work is nearing completion at Wallingford Bridge, with the deck reinforcement now complete. The team is now completing finishing touches on site, including chip sealing, constructing the approaches to the deck and installing the guardrail. We are excited to see the team complete this work and start setting up on site at Kokomoko Bridge. 


Wallingford Bridge – PGF Porangahau Wimbledon Road

The north bound lane has been completed, and the south bound lane is about to be poured, the project is on track to be completed by late May 2021, the team will then move onto Kokomoko Bridge.

C1096 Walingford Bridge l Progress 30.04.21

Wallingford Bridge:

Strengthening work on Wallingford Bridge is progressing well by the Concrete Structures team. The new concrete has now been poured on the Waipukurau bound lane and deck steel has been installed. 

Wallingford Bridge


Wallingford Bridge Strengthening: 

Our bridge upgrade programme is in full swing and the team are 50% of the way through the drilling of nearly 4000 holes to install bolts that will connect the new deck of the bridge to the existing deck structure. We were able to recently take the MBIE provincial development unit out for a site visit!

This first bridge upgrade is currently employed by an all CHB local team and has one new employee through the Mayors Taskforce For Jobs, with another looking to start this week. We expect to start works on the next bridge ‘Kokomoko’ in the next month!

173 Wallingford Site visit with MBIE

Wallingford Bridge Strengthening: 

Concrete Structures are now onsite to complete strengthening work at Wallingford Bridge. Traffic management has been set up, the bridge deck surface milling is complete and the team are just finishing scaffold installation. This week Concrete Structures will finish scanning and marking all the drilling locations and existing reinforcement, ready for the drilling.

wallingford 1

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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