The world’s largest Tunnel Boring Machine or TBM just arrived in Seattle last week from Japan. Hitachi Zosen Corp built the 57 foot diameter TBM and tested it before disassembling it for the journey by boat to the Port of Seattle. Bertha will soon begin it’s 16 month journey to bore a tunnel to replace the famous Alaskan Way Viaduct along Seattle’s waterfront. [Source: Puget Sound Business Journal via ASCE SmartBrief. Image: www.bizjournals.com/]
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According to ENR, the U.K. government has approved the 7-year, $32-billion London Crossrail Project which will reportedly be Europe’s biggest civil engineering project. It will include 41.5-km of tunnels 6-m in diameter laid out in pairs. The tunnels will pass underneath London and connect surface networks on either side of the city. Link after the break. (Photo by tkosaka)