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CANOPIED PORTALS FOR NATM RAIL TUNNEL

Amy Mosig Way

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Abstract

Construction of a twin-track NATM rail tunnel outside Salzburg in Austria is proceeding according to schedule. The tunnel is being built in loose alluvial sands and gravels which are responding well to the NATM method. Canopies consisting of a primary shotcrete shell reinforced with lattice girders and mesh are being constructed at the portals, the northern one being 45m long to accommodate the weight of two roads which will eventually pass overhead with an overburden of only 1m. (A)

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What this paper is about

Construction of a twin-track NATM rail tunnel outside Salzburg in Austria is proceeding according to schedule. The tunnel is being built in loose alluvial sands and gravels which are responding well to the NATM method. Canopies consisting of a primary shotcrete shell reinforced with lattice girders and mesh are being constructed at the portals, the northern one being 45m long to accommodate the weight of two roads which will eventually pass overhead with an overburden of only 1m. (A)

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Available abstract

Construction of a twin-track NATM rail tunnel outside Salzburg in Austria is proceeding according to schedule. The tunnel is being built in loose alluvial sands and gravels which are responding well to the NATM method. Canopies consisting of a primary shotcrete shell reinforced with lattice girders and mesh are being constructed at the portals, the northern one being 45m long to accommodate the weight of two roads which will eventually pass overhead with an overburden of only 1m. (A)

Key concepts: New Austrian Tunnelling method, Shotcrete, Engineering, Overburden, Roadheader, Girder, Tunnel construction, Excavation

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