Tubular bridge
From Biocrawler, the free encyclopedia.
Section of the original wrought iron tubular Britannia Bridge standing in front of the modern bridge
A tubular bridge is a bridge built as a rigid box section within which the traffic is carried. Famous examples include the original Britannia Bridge over the Menai Strait and the Conwy railway bridge over the River Conwy both of these were designed and built by Robert Stephenson between 1846 and 1850. In the case of the Britannia bridge this technology allowed a bridge 1511 foot long to be constructed, yet until then the longest wrought iron span had been 31ft 6 inches.
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