William Stewart Bridge

LOCATION William Stewart Bridge    PRINCIPAL Grey District Council   PROJECT DATES October 2021 – 21 Jan 2022

Design and replacements of Superstructure elements and seismic strengthening on the 240m long single traffic lane William Stewart bridge in Kumara, West Coast.

Time Management: The contract called for the complete replacement of the bridge superstructure with a maximum road closure duration of 3 months allowed in the contract. CSL’s design focusing on precast deck panels and prefabricated Girders allowed for the full replacement and reopening of the bridge in exactly 3 weeks.

Budget Management: CSL completed this project under budget, offering huge savings on the council estimate of $5.8 Million. Subcontractors engaged for TMP, Earthworks and minor steel work, Remainder self-performed by CSL.

H&S Plan: Implemented with no LTI’s, environmental incidents or any significant non-compliance issues raised during any site inspection by Contract engineers, GDC, or Environment Southland staff.

Traffic Management: CSL engaged a local traffic management provider to develop a suitable TMP, then implement and maintain during the works. The planned closure of 3 months was only required for 3 weeks significantly reducing disruption to travellers.

“Chris Calder, Ngai Tahu Forestry is equally impressed. “Yes, they were blessed by the weather, but the speed at which they completed the demolition and new build is a credit to them. To meet a deadline for such a project is very rare. To achieve it well under the deadline is incredible. We had to do only a little juggling to our forestry operation schedule and are very pleased that everything is back on track so quickly. And the wide smiles and cheerful waves from the milk tanker drivers speak volumes.”

QMS: QMS in place & conformed to AS/NZS ISO9001:2015. Site audits carried out, QA records completed daily, and test certificates obtained for materials prior to use. Hold points for the Engineers rep, i.e. concrete pre-pour inspections, are laid out within a site specific ITP. There were no significant defects of remedial works required.  No disputes arising from this project.

River Works: Environmental protection measures were in place to ensure all activities were safely carried out & achieved full compliance with the Resource Consent.  West Coast Regional Council were consulted at an early stage to ensure all works complied with regional permitted activities. No environmental incidents occurred on this project.