The wall shown in the photos below will eventually become the east portal wall. According to Caldecott-tunnel.org, most walls are built from the base upwards.
First, an auger drills large holes, ninety feet deep and several feet apart. Concrete is poured into the circular holes and allowed to harden. Keep reading >>
By: Brendan Nee
Construction crews are busy at work on the east and west sides of the tunnel, building the portal walls and retaining walls to hold back the hillsides. Most of this work has to be completed before excavation of the tunnel can actually begin.
According to caldecott-tunnel.org, each portal wall Keep reading >>
By: Brendan Nee