This 57-km tunnel under the Swiss Alps has nearly broken through after 11-years of work. This tunnel will create a ‘flat’ rail path through the Alps and become the world’s longest rail tunnel. [Source: World Tunnelling. Image: Alp Transit]
The Devil’s Slide Tunnels that bypass a landslide prone stretch of California coast will not open until late 2012, a full year later than anticipated according to Caltrans. The tunnels broke through back in October, […]
On September 17, CALTRANS and Kiewit Pacific held a "tunnel excavation celebration" to kick off the start of tunnel construction on The Devil’s Slide Tunnels project on California State Route 1 (the Pacific Coast Highway) in San Mateo County between the town of Montara to the south and the city of Pacifica to the north. The project involves the creation of a separated two-lane road, one lane in each direction. This road will pass through twin tunnels, over twin bridges and connect with an existing non-separated two-lane road at each end. The new road will be approximately 6,500 feet long, made up of the roughly 4,000-foot twin tunnels, the 1,500-foot north approach road (which includes the 1000-foot parallel bridges), and the 1,000-foot south approach road. Upon completion, the new road will bypass geologically unstable portions of existing Route 1, sections of roadway subject to lengthy closures, high maintenance costs over the years, and risk of permanent failure. Thanks Geology.com for the heads up. [Read on for more background, photos, maps, and movies!] (Images by CALTRANS)
The San Francisco Public Utility Commission has a $4.6B program in place to try and make the water storage and supply system for the Bay Area ‘earthquake proof’ by 2015. It involves 86 separate projects, […]
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To speed the project, intermediate shafts were sunk to allow for simultaneous tunnelling on several faces, these points (Erstfeld, Amsteg, Sedrun, Bodio and Faido) to become integrated in the finished structure for servicing and emergency access.