25 Facts About Pontoon bridge

Pontoon bridge, known as a floating bridge, uses floats or shallow-draft boats to support a continuous deck for pedestrian and vehicle travel.

Pontoon bridge is a collection of specialized, shallow draft boats or floats, connected together to cross a river or canal, with a track or deck attached on top.

Flexible connections have to allow for one section of the Pontoon bridge to be weighted down more heavily than the other parts.

Each bridge section consisted of one or more pontoons, which were maneuvered into position and then anchored underwater or on land.

Hobart Bridge, a long pontoon bridge built 1943 in Hobart, was only replaced after 21 years.

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The Pontoon bridge can be dislodged or inundated when the load limit of the Pontoon bridge is exceeded.

The Pontoon bridge can be induced to sway or oscillate in a hazardous manner from the swell, from a storm, a flood or a fast moving load.

However, the historian Joseph Needham has pointed out that in all likely scenarios, the temporary pontoon bridge was invented during the 9th or 8th century BC in China, as this part was perhaps a later addition to the book .

Armies of Emperor Taizu of Song had a large pontoon bridge built across the Yangtze River in 974 in order to secure supply lines during the Song Dynasty's conquest of the Southern Tang.

Emperor Caligula is said to have ridden a horse across a pontoon bridge stretching two miles between Baiae and Puteoli while wearing the armour of Alexander the Great to mock a soothsayer who had claimed he had "no more chance of becoming emperor than of riding a horse across the Bay of Baiae".

The Carolingian army of Charlemagne constructed a portable pontoon bridge of anchored boats bound together and used it to cross the Danube during campaigns against the Avar Khaganate in the 790s.

Bohemian troops under the command of Frederick I, Holy Roman Emperor crossed the Adige in 1157 on a pontoon bridge built in advance by the people of Verona on orders of the German Emperor.

However, as the Pontoon bridge broke apart it all ended in a sound defeat of the Spanish by local Mapuche-Huilliche forces.

In 1872 at a military review before Queen Victoria, a pontoon bridge was thrown across the River Thames at Windsor, Berkshire, where the river was 250 feet wide.

British Blanshard Pontoon bridge stayed in British use until the late 1870s, when it was replaced by the "Blood Pontoon bridge".

The Blood Pontoon bridge returned to the open boat system, which enabled use as boats when not needed as pontoons.

Treadway bridge was a multi-section, prefabricated floating steel bridge supported by pontoons carrying two metal tracks forming a roadway.

An M2 treadway Pontoon bridge was designed to carry artillery, heavy duty trucks, and medium tanks up to 40 short tons .

Donald Bailey invented the Bailey Pontoon bridge, which was made up of modular, pre-fabricated steel trusses capable of carrying up to 40 short tons over spans up to 180 feet .

The M4 bridge featured a lightweight aluminum balk deck supported by rigid aluminum hull pontoons.

The M4T6 bridge used the same aluminum balk deck of the M4, but supported instead by inflatable rubber pontoons.

The Class 60 bridge consisted of a more robust steel girder and grid deck supported by inflatable rubber pontoons.

All three pontoon bridge types were cumbersome to transport and deploy, and slow to assemble, encouraging the development of an easier to transport, deploy and assemble floating bridge.

The 185-meter Pontoon bridge was built to support retrograde operations because of the heavy-armor traffic crossing a partially destroyed adjacent highway span.

In 1979, the longest floating Pontoon bridge crossing salt water, the Hood Canal Bridge, was subjected to winds of 80 miles per hour, gusting up to 120 miles per hour .

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