Featured Projects

Watercare Wastewater Pipeline

The current Army Bay Wastewater Treatment Plant has serviced the population of Whangaparāoa Peninsula, Ōrewa, Hatfields Beach and Silverdale since 1982. The Plant treats wastewater and discharges it through a 2.8 kilometre outfall pipe that extends one kilometre out into the fast-flowing Tiri Channel. The existing pipe was aging and not designed to cope with future growth. 

This meant that a new pipe was needed, and Preco were selected to supply precast pipe weights to anchor the new pipe to the seabed. The pipe weights are installed to the pipe on land, then once the pipe is towed into position it is sunk to the seabed. 

The new pipe is sufficiently sized to accommodate for predicted population growth. 

Hairini Underpass

The Underpass at the Maungatapu Roundabout Tauranga was originally tendered in late 2014 and has been in construction over the last 3 years.  The underpass is a two lane link which will improve traffic flow around the roundabout and will link Welcome Bay Road to Turret Road.  

The project included bridges, barriers, a two span bridge over the Kaitemako Stream, Pedestrain Underpass units and  precast fascia panels to the underpass.  The project was completed by Fulton Hogan and required precise timing and delivery of product to able construction on the busy site.  The project will be open to traffic mid 2018.

Route K Bridge

The Route K  bridge near Wylie St in Gate Pa, Tauranga, will create a link for walkers and cyclists between the track skirting the western side of the valley from Westridge and the tracks on the Cameron Rd side of the valley.

For this project Preco supplied the precast deck units for the bridge including the approach spans. These were completed with a non-slip exposed aggregate finish to meet architectural requirements.  The project went smoothly with the truss and the roadway precast being installed in one 10 hour night shift.

Soljak Place Bridge

Located in Avondale, Auckland, this bridge passes over an electrical railway and is part of the Waterview Shared Path. 

This is a community amenity being constructed by the Well-Connected Alliance for the NZ Transport Agency’s Waterview Connection project.  

An innovative approach was required to build these two unique post tensioned beams, which both required horizontal curves and vertical cambers to overcome the height and location constraints over the electrified rail system. The modelling and design of the moulds and detailing of the final shapes had to accommodate shortening and precamber to accurately fit onto the piers.

Because of these unique requirements our approach was to use a high degree of computer modelling combined with state of the art profile cutting to create accurate moulds from which the beams were cast.  This required the brainstorming of ideas from moulding, manufacture, lifting and transportation specialists.  

The twin beams are a unique statement of what can be achieved through collaboration and creativity, coupled with industry proven construction methods as well as exciting and emerging ways of thinking.

The Kaikoura Recovery

We’ve been involved in the recovery of State Highway 1 through to Kaikoura and Christchurch. 

We have made 2300 sea wall retaining blocks to date (that’s 30 a day) which will help protect the road from future erosion. We will also be making 900 capping blocks for the top of the wall, which will create a footpath and cycleway on top of the wall.

BNR Mangere Sewage Works

The team at Preco completed the upgrade at the Mangere WWTP, supplying precast to two clarifier tanks and the 94m x 70m reactors 10 and 11. 

The project included on site casting of the 60 tonne reactor wall panels and the offsite casting of the 52m diameter clarifier tanks. In addition to the precast supply, Preco was also responsible for the post tensioning of all the floor and wall components to the three structures, installing approximately 200 tonne of prestressing strand. 

Transmission Gully Culvert

We’ve been busy working on Transmission Gully in Wellington. This 27 kilometre, four-lane motorway will run from Mackays Crossing to Linden, through Transmission Gully. Preco designed and supplied utility box culverts, running service pipes and water mains which run from one side of the carriageway to the other. 

The design was complicated because the culverts were at depth in a high seismic zone. This completes the first stage, and we will now move onto providing bridge barriers for future stages of the project. 

New Market Level Crossing: Bridge Beam

Preco worked with Oxcon on this New Market project, involving a pedestrian overpass. 

"I know the effort you and your team put into those beams, despite all the challenges. We have made it clear to AT that this was no easy feat by Preco, and I’m sure that your reputation has been enhanced. From my perspective, it was business as usual with Preco. You do what you say you’re going to do, identifying and solving the problems as you go."


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