712 ビクトリア時代の技術者 : ブルネル父子 : 第 12 報 GWR のメイドンヘッドブリッジとボックストンネル

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This paper describes two buildings of bridge and tunnel, which IKB had revolutionized for the Great Western Railway (GWR). The line between London and Bristol was completion in 1838,and it needed to cross the Thames at Maidenhead. Isambard Kingdom Brunel (IKB) was commissioned to design the bridge and built it. It was required a bridge spanning 380ft, with only on intermediate support, but must also be capable of carrying the 150-ton locomotive. There is a limit to the gradient on approach to Paddington, which is dictated by the maximum power output of the steam locomotive in use then. As a result of that restriction, the height of the arch under the bridge is limited to 24.5 ft. This beautiful Maidenhead Bridge was the flattest brick arch at the time. The Box Tunnel between Bath and Chippenham was the most difficult engineering problem that IKB had to solve. It was 2 miles in length and took almost 6 years to complete. Box Hill consists mainly of limestone. Two miles long, on a descending gradient of 1 in 100,the popular opinion of the time was that the slope was so great that if the longest tunnel in the world. Both the Bridge and the Tunnel carry trains from London to Bristol And South Wales today.
社団法人日本機械学会の論文
2003-03-13