Auckland – West                          Mainly West of Queen Street – seen through my lens

July 12, 2015

19,468 … 19,469 … …

Filed under: Mount Roskill — paul @ 7:07 am
19,468 ... 19,469 ... ...

19,468 … 19,469 … …

These are precast segments of the lining of the tunnel of State Highway 20, currently under construction. Each is 2 metres wide, weighs about 10 ton and 10 of them form a ring supporting the 14 metres wide tunnel. In all, about 24,000 of them have been cast in a purpose-built facility in East Tamaki, and here they wait at the southern tunnel approach to be transported to the Tunnel Boring Machine (called Alice). You will, of course, have done some fast and furious mental arithmetic, figuring that this yields about 2.4km of double tunnel.

(The segments arrive by road in sets of three, carefully numbered.)

You can watch a video of the casting process here.

As far as the eye can see

As far as the eye can see

1 Comment

  1. That’s a whole lot of material.

    Comment by William Kendall — July 12, 2015 @ 7:42 am

Sorry, the comment form is closed at this time.