Caldecott Tunnel construction update – rails and waterproof membrane installation photos | 511 Contra Costa

Caldecott Tunnel construction update – rails and waterproof membrane installation photos

Now that the east and west sides of the Caldecott Tunnel meet, construction crews have started working on installing rails for a gantry system and waterproof membrane. Check out the newest construction photos below.

Above: Crews began installation of the rails for the gantry system and the waterproof membrane in early January 2012. The gantry system is a set of tracks and a frame that will enable the waterproofing and final lining installation equipment to slide from west to east as tunnel excavation is completed.

Above: Installation of the waterproofing membrane will be completed in sections followed by the concrete arch tunnel lining and roadway concrete.
And if you missed the Caldecott Tunnel Fourth Bore Breakthrough, here’s a neat time-lapse video:

For more official Caldecott Tunnel construction information, visit http://caldecott-tunnel.org

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