The Tyne Tunnel, Gt. Britain
DOI:
https://doi.org/10.3989/ic.1970.v23.i221.3558Abstract
The Tyne Tunnel, which runs under the river Tyne, is the most important project of its type in Britain. It is 1,676 m long, has an inner diameter of 9.46 m, a useful width of 7.32 m and a free height of 4.88 m. It contains a two directional roadway. There are two smaller, lateral tunnels, parallel to the main one, to provide communication for pedestrians and cyclists. These served also, in a certain sense, as pilot tunnellings, to study the soil and forestall the difficulties that would develop on excavating the main opening. The tunnel was excavated by means of a compressed air system. The approach roads have a total length of 4.8 km and are 7.32 m wide, but they can be widened to 10.97 m, if needed. It was necessary to build three bridges over railway lines; one viaduct and three overpasses over roadways. The ventilation, illumination and other services of the tunnel have been very carefully planned and the project is fitted with all modern devices.
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