The Northland Tunnel is in very good structural condition, and had earthquake strengthening work completed in 2017. However, there was a longstanding issue with ground water seepage penetrating the internal barrel joints of the tunnel which results in the increase in maintenance costs.
To resolve the issue, we contracted Concrete Solutions Ltd to apply a suitable waterproofing system to prevent seepage. We completed the waterproofing and painting of the interior walls in July 2020.
What we did
- Applied a suitable waterproofing system to the tunnel to prevent seepage.
- Repainted the interior tunnel barrel.
- Applied an anti-graffiti coating to the interior of the tunnel.
Northland Tunnel links Northland with the central city and Karori. The tunnel was constructed in the 1923 with the first tram service eventually commencing on the 4 June 1929 after many years of ‘start-stop-start’ construction work.
It is a listed heritage object in the District Plan because of classical style arched opening entrances. The tunnel is in very good structural condition, and had earthquake strengthening works on the portal entrances completed in 2017.
Jone Sumasafu – Civil/structures Project Engineer