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Waterview Connection, Auckland

Over 3,500 Ancon BT Parallel Threaded Couplers have been installed on this NZ$1.4bn infrastructure project in Auckland.

The Waterview Connection is 5 kilometres of six lane motorway passing through and beneath Auckland’s western suburbs. Upon completion in 2017, it will link State Highways 16 and 20 completing the city’s Western Ring Route providing a much needed alternative for commuters to State Highway 1, which is regularly over capacity at peak times.



Ancon BT Parallel Thread Couplers were supplied by Fletcher Reinforcing who worked closely with main contractor Well-Connected Alliance to find a solution for the challenge of splicing reinforcing bar up to 40mm in diameter.

As part of the approach to one of the tunnel entrances, the Alliance designed in a diaphragm wall construction which required a varying depth of reinforcing cage as the road nears the tunnel entrance. Ancon BT Parallel Thread Couplers produce a full strength joint and are a well-established solution, tried and tested in equivalent diaphragm wall applications around the world.

The ends of the bars to be joined are cut square and enlarged by cold forging to increase their core diameter and so ensure that the joint is stronger than the bar. The strength of a mechanical splice is independent of the concrete in which it is located and will retain its strength despite loss of cover as a result of impact damage or seismic event.

On this basis, Fletcher Reinforcing introduced Ancon BT Couplers to the Alliance and supplied reinforcing bar which had been cut, threaded, coupled and fabricated into over 100 individual cages – the biggest being approximately 31 metres long and weighing 35 tonnes.

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Ancon reinforcing bar couplers can simplify the design and construction of reinforced concrete and reduce the amount of reinforcement required.

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Independent tests have verified the enhanced performance specifically offered by Ancon KSN Anchors when used in slab-to-wall moment connections.

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