Pyramid Bridge Replacement

LOCATION Pyramid Bridge, Gore    PRINCIPAL Gore District Council   PROJECT DATES November 2019 – June 2020

Design and Build new 75m, 3 span, single hollowcore bridge over the Mataura River.

Time Management: The programme allowed for a 6 month construction timeline with completion in June 2020, and was well ahead of schedule prior to Christmas.  The works did suffer unforeseen delays in March 2020 with the Covid-19 national lockdown, however as the programme was so tightly managed prior, it was completed within the original contract period. The bridge opened on 26 June 2020.

Health & Safety: CSL was committed to providing comprehensive Health & Safety and Environmental Management throughout the project. There were no LTI’s, environmental incidents or any significant non-compliance issues raised during any site inspection by Contract engineers, GDC, or Environment Southland staff.

Concrete Bridge Construction Works: Hollowcore beams have all been cast off site at our Christchurch factory and delivered to site on our trucks which guaranteed our erection programme.

River Works: Appropriate environmental protection measures were in place to ensure all activities are safely carried out and achieved full compliance with the Resource Consent.  Gravel was pushed out into the river to make a causeway and allow work on the bridge, while leaving a channel for the river to flow.

The Bridge faced one of its toughest tests in 2020 with only two spans in place when record breaking flooding from the Mataura River struck the first week in February. The bridge is designed to withstand the side-load of flood waters with flooding coming within half a metre of the bridge spans, though no damage was incurred and the bridge proved its design even in early construction.  No environmental incidents occurred on this project.

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

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