City Rail Link (CRL) has achieved another milestone today on Thursday 24 May, bringing work closer to construction on the City Rail Link tunnels that will make Britomart train station a through station.
The milestone is the completion of secant piling which has been happening in Lower Queen Street outside the former Chief Post Office (Britomart).
The secant pile walls will connect the excavation under Britomart to the excavation at Precinct Properties' Commercial Bay development on the other side of Lower Queen St, where CRL tunnel boxes are being constructed.
70 secant piles had to be installed and the last one was completed today. Secant piling is the construction of intersecting reinforced concrete piles.
These piles lock together for strength and control any groundwater ingress into the tunnel excavation. A 70-tonne piling rig was brought in for the drilling.