The CRL is due for completion in early 2024.
Construction for Contract 1 and Contract 2 has started.
The C6 Mt Eden Stormwater Main Relocation Contract has been awarded.
This involved firstly constructing a new temporary entrance facility for Britomart Station in Commerce Street so the Queen Street entrance could close. This happened in January 2017.
This enabled our construction partner Downer Soletanche Bachy Joint Venture (DSB JV) to build the train tunnels under the Chief Post Office and Lower Queen Street.
- the cut and cover tunnels up Albert Street from Customs Street to Wyndham Street
- the pipe-jacking of a new stormwater pipe from Swanson to Wellesley Streets
- the strengthening of the Orakei main sewer.
These are being delivered by our construction partner, Connectus.
The cut and cover tunnels - built in trenches from the surface - will be completed by late 2019.
Once the trenches have been dug, the concrete floor, walls and roof of the tunnels will be cast before the structures are backfilled.
The C6 Mt Eden Stormwater Main Relocation Contract was awarded to March / Bessac JV.
The Mt Eden contract worth $16.5M is for the construction of a new underground stormwater tunnel between Water and Nikau Streets to replace an existing adjacent pipe that will be in the way of the CRL tunnels.
STORMWATER: You can see the existing stormwater pipe is in the way - although the Huia water main isn't - so the pipe needs to be moved. (Design: Aurecon)
All the surface work for the stormwater diversion will be on CRL-owned property with minimal effect on traffic. There will be shafts at Water and Nikau Streets to provide underground access for a micro tunnel-boring machine that will simultaneously excavate and install a new stormwater pipe using a pipe jacking technique.
The Water Street shaft will be 16m deep and a 50-80 tonne crawler crane will be used to lift in equipment.
A rock breaker will be used at Nikau St to break through a layer of rock that has been identified in boring investigations.
Lava from the Mt Eden volcano is present in the area of the work and until work begins, there is no certainty about how tough the ground will be to breakthrough.
Before work starts, two CRL-owned buildings on Mt Eden Road and Ruru Street will be demolished as part of this work.
The stormwater realignment works will finish around April next year.
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