Massive concrete linings complete
The final concrete piece in the Waterview tunnel puzzle is ready to be installed.
A purpose-built factory in East Tamaki cast the last of 24,000 segments being used to line the Waterview Connection project’s motorway tunnels on June 26.
NZ Transport Agency Auckland state highways manager Brett Gliddon says the linings have been a key component in the design and construction of the twin tunnels.
‘‘This factory has done a first rate job consistently delivering such a big quantity on time,’’ he says.
‘‘This has made a significant contribution to keeping us well on target for the project to be completed in December 2016 and the planned opening to traffic in early 2017.
‘‘The linings for these tunnels have needed to be extremely precise with tothe-millimetre precision so they fit perfectly together inside the tunnels.
‘‘They’re also incredibly strong, durable enough to withstand 100 years of traffic use,’’ Gliddon says.
Each 10.5 tonne segment is one of 10 which make up 2414 rings of concrete lining. Each ring is 2 metres wide and 14m in diameter.
The segments are delivered to the project site in Owairaka where the tunnel boring machine known as Alice has been installing the segments at a rate of six linings every 24 hours that the machine is operating.
Alliance project manager John Burden says the facility has provided opportunities for skill development.
‘‘In addition to producing the tunnel segments on time and under budget, the team have worked hard with the local community to hire, train and develop a workforce that is now able to move on to higher skill jobs.’’
The last segment of Waterview’s concrete tunnel lining is ready to be put in place.