Abstract
AbstractIn Stockholm, Implenia builds of one of the world's deepest metro stations. This new metro station is an extension of the Blue Line to Södermalm. Beside the station single‐track tunnels for the subway, lift shafts, and a collateral service tunnel are constructed. Due to the difficult geological conditions and the bad quality rock, the AT – Pipe Umbrella System with squeeze connections were used to reinforce excavations and bolster safety during construction (photo: DSI Underground).
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