|
Daylighting a tunnel is to remove its "roof" or overlying rock and soil, thus exposing the railway or roadway to daylight. This could also be seen as converting the tunnel to a railway or roadway cut. Tunnels are often daylighted to improve vertical or horizontal clearances, for example to accommodate double-stack container trains or electrifying rail lines, where increasing the size of the tunnel bore would be impractical. ==List of daylighted tunnels== * United Kingdom * * Lime Street Station in Liverpool was originally approached through a twin-track tunnel completed in 1836. The tunnel was daylighted in the 1880s, and replaced with a deep four-track cutting, with only the eastern approaching Edge Hill railway station remaining as a tunnel. * United States of America * * Auburn Tunnel on the Schuylkill Canal, daylighted in 1857 * * Tunnel No. 5 on the Alaska Railroad's Seward-Anchorage line〔F. C. Weeks et al., "Tunnel 'Daylighting' on the Alaska Railroad," ''Transportation Research Record'' No. 1119, ''Geotechnology'' (1987).〕 * * Tunnel No. 5 on the Virginia & Truckee Railroad at Nevada S.R. 341 near Virginia City * * The (Gwynedd Cut ) on the North Pennsylvania Railroad, near North Wales, Pennsylvania, built as a tunnel between 1853 and 1856, daylighted in 1930 when the Reading Railroad electrified the line * * A number of tunnels were open cut for the National Gateway project including: * * * (Shoo Fly Tunnel ) (2012) * * * (Pinkerton Tunnel ) (2012) * * * (Bedford Tunnel ) (2012) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Daylighting (tunnels)」の詳細全文を読む スポンサード リンク
|