CAT
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PROJECTS WITH A VALUE OF BETWEEN $2 MILLION AND $5 MILLION
Triple-barrelled water pipeline for NX2 PROJECT: Ara Tūhono – Pūhoi to Warkworth Motorway Project – CN8A Culvert CONTRACTOR: Pipeline & Infrastructure CLIENT: Waka Kotahi (NZTA) and the Northern Express Group (NX2) –
Fletcher/Acciona CJV VALUE: $3m
In 2017 the Fletcher/Acciona Construction Joint Venture (CJV) engaged Pipeline & Infrastructure (P&I) to deliver the CN8A culvert. This culvert is part of the Ara Tūhono – Pūhoi to Warkworth motorway project north of Auckland. The Pūhoi to Warkworth project is a public private partnership between Waka Kotahi NZ Transport Agency (NZTA) and the Northern Express Group (NX2). NX2 has contracted the Fletcher/Acciona CJV to build the motorway. CN8A is a complicated, large diameter triple barrel stormwater pipeline, built in a steep valley approximately 50m deep along the
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main pavement alignment of the new SH 1 section. The 220m long culvert consists of three Polyethylene pipes; one at 2500mm diameter and two at 2000mm diameter. The works were at the bottom of a remote bush-clad gully, between two steep rock bluffs. Constructed from 2017 to 2020, the purpose of the culvert was to pipe the existing stream water to allow for 600,000 - 700,000 m3 of fill to be placed inside the gully to fill up to the new motorway pavement level. Once the fill was complete the new motorway pavement level sits approximately 45m above the existing stream/pipe invert level.
CCNZ / HIREPOOL CONSTRUCTION EXCELLENCE AWARDS 2021
