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 designed and built by Robert Stephenson between 1846 and 1850. In the case of the Britannia Bridge this technology allowed a bridge 1511-ft long to be constructed, when until then the longest wrought iron span had been 31 ft 6 inches. Download high resolution version (962x1114, 399 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (962x1114, 399 KB) Wikipedia does not have an article with this exact name. ... Britannia Bridge is a bridge across the Menai Strait between the island of Anglesey and the mainland of Wales, originally made of wrought iron rectangular box section spans, and now a two-tier steel box girder and arch bridge. ... Britannia Bridge is a bridge across the Menai Strait between the island of Anglesey and the mainland of Wales, originally made of wrought iron rectangular box section spans, and now a two-tier steel box girder and arch bridge. ... The Menai Strait (in Welsh Afon Menai, the River Menai) is a narrow stretch of shallow tidal water about 14 miles (23 km) long, which separates the island of Anglesey from the mainland of Wales. ... The western end of Stephenson‘s bridge across the Conwy right next to the castle. ... The River Conwy, or, in Welsh Afon Conwy , is a river in North Wales. ... For the lighthouse engineer see Robert Stevenson Statue of Robert Stephenson at Euston Station, London Robert Stephenson FRS (October 16, 1803 - October 12, 1859) was an English civil engineer. ... 1846 was a common year starting on Thursday (see link for calendar). ... 1850 was a common year starting on Tuesday (see link for calendar). ...
Britannia Bridge (Pont Britannia) is a bridge across the Menai Strait between the island of Anglesey and the mainland of Wales, originally a tubularbridge of wrought iron rectangular box-section spans, and now a two-tier steel box girder and arch bridge.
The opening of the Menai Bridge in 1826, a mile (1.6 km) to the east of where Britannia Bridge was later built, provided the first road link between Anglesey and the mainland.
In spite of the heavier loadings placed on it in its later life, the bridge was "one of the most easily maintained and successful railway bridges" in the UK, and "as the first really large wrought iron bridge of the girder type it has unique significance in civil engineering history".
Covered bridges are generally considered old-fashioned, and appeal to tourists, but the purpose is twofold: (1) covered bridges appear similar to barns and it is easier to transport cattle across them without startling them, and (2) to build a structure for weather protection over the working part of the bridge.
Modern covered bridges are usually for pedestrians, for example to walk from one part of an office building to another part, to cross railway tracks at a station, or in a shopping center on an elevated level, crossing a road.
Also, some highway bridges, such as the George Washington Bridge, have lower decks for additional capacity, and those decks, while generally open on the sides, can be enclosed with plastic from time to time during construction, thus rendering the lower decks as partially covered bridges.
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