The CRL is due for completion in 2024.
Construction for Contract 1 and Contract 2 has started.
The C6 Mt Eden Stormwater Main Relocation Contract has been awarded and work started.
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.
Construction partner Downer Soletanche Bachy Joint Venture (DSB JV) were then able to start to build the train tunnels under the Chief Post Office and Lower Queen Street.
On Lower Queen Street, CRL has started excavating the 14-metre deep trench that will contain the project's twin rail tunnels between Britomart Station and the Commercial Bay development.
This follows two years of preparation work to protect Britomart's historic Chief Post Office building and support the ground before the trenching and tunnel construction began.
A single 25-metre trench will be excavated on Lower Queen Street and two 10-metre wide trenches under the central post office building.
Tunnel box construction will start at the location at the end of this year. The weight transfer of the building onto a series of underpinning frames is near completion.
- 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 (McConnell Dowell and Downer JV).
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.
All the surface work for the stormwater diversion is on CRL-owned property with minimal effect on traffic. There are 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 is 16m deep and a 50-80 tonne crawler crane is being used to lift in equipment.
A rock breaker is being 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 there is no certainty about how tough the ground will be to breakthrough.
Before work started, two CRL-owned buildings on Mt Eden Road and Ruru Street were demolished.
The stormwater realignment works will finish around April next year.
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