Mega milestone
A major milestone for Karangahape Station has recently been accomplished. The Diaphragm wall construction in Beresford Square has finished with the final panel of 30 poured on Friday 12 February, meaning that the walls for both station boxes are now complete.
Across the two station entrances a total of 56 panels are now installed. This means saying goodbye to the bentonite plant, hydrofraise cutter, grab rig and crane which will make way and space for the next stage of works. The bentonite plant, which is modular, has be broken up, with parts going to Mt Eden Station, Aotea Station, France and Singapore.
The focus has now turned to building the ‘L0 slab’, which is the 900mm thick street-level roof to the underground station.
The pictures below show the transformation of Beresford Square over a week following completion of the D-walls as preparations are made for the L0 slab. The layer of concrete recently poured is known as ‘blinding’ and is not part of the slab. Blinding creates a working platform and lay-down area for the steel reinforcing cages and will be removed as part of the excavation for the floor below. It also acts as formwork for the slab ensuring that the finish is smooth.
This 'L0 slab' stage of work is much further along at Mercury Lane, where steel fixing and concrete pouring has been taking place for a number of weeks. The opening photos show the large number of workers involved and the huge amount of steel being placed within the ground floor entrance to the station. In the coming weeks the final two pours for the entrance slab will take place at Mercury Lane and the dig beneath the slab will begin!
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