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英国伦敦的达特福特大桥（封三、封底说明）封底的图片介绍英国伦敦的达特福特大桥的两个特大沉箱的设计和施工的一些情况。达特福特桥建在伦敦东面的泰晤士河上，桥长８１５ｍ，中间主跨长４５０ｍ，两端各有三个引桥跨，跨度自５３ｍ至６８ｍ不等，四车道，建桥后可减轻...
Dartford Bridge in London, England (cover three, back cover instructions) The picture on the back cover shows some of the design and construction of two large caissons at Dartford Bridge in London, England. Dartford Bridge was built on the River Thames to the east of London. The bridge has a length of 815m and a main span of 450m. Both ends of the bridge have three crossings spanning from 53m to 68m.