'tis just life

keamy

Anonymous 发表于 2012-11-16 19:19

=.= why……

Anonymous

keamy 发表于 2012-11-16 19:18
lol,,,,,,okay...... :L

What you need is a special link.

keamy

Anonymous 发表于 2012-11-16 19:20
What you need is a special link.

what link :O how do you know all this haha

keamy

The Pont du Gard is a bridge that was built to carry a water channel or specus across the river Gard, in the south of France.

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Although it now serves as a modern roadway, the Pont du Gard was originally a functioning section of a much larger aqueduct system that was designed to supply water to the Roman colony of Nemausus, modern Nimes.

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The source of the water was a series of springs located more than 50 kilometres away, near a town called Uzes, and the water was carried in underground pipes or in a channel supported by a series of low walls.

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It was only when the stream of water had to cross rivers or gorges that bridge-aqueducts like the Pont du Gard became necessary.

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Augustus' son-in-law, Marcus Agrippa, commissioned this extensive and complex engineering feat sometime between 20 and 16 BC.

淇淇5277

Anonymous 发表于 2012-11-16 20:12
x factor time to go

omg my favourite. 你看第几季?最新的?

keamy

The problem faced by Roman architects who built aqueduct systems like the one that supplied water to Nimes was that they had to construct a channel placed on an incline that was steady enough to ensure that the water flowed freely to its destination.

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Gravity was the chief power source in such structures and it worked admirably in the case of Agrippa's system:

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the incline was so steady that the level of the channel dropped by no more than 17 metres over the entire length of the aqueduct.

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The Pont du Gard is 275 metres long and 48.77 metres high.

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The water channel, which runs along the top layer of the structure, is supported by three tiers of arches based on a simple series of proportions.

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Rising from both banks of the river Gardon are five cut-stone piers which support the six massive arches that make up the base of the structure.

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These arches support the remaining tiers as well as the modern roadway.

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To allow for flooding of the normally shallow river, the foundation of each of the piers has been strengthened and the central archway has been slightly widened to 24.52 metres as opposed to 15.54 metres.

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This allows for the increased water flow.

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The wider central arch spans the river entirely so that it is not necessary for any of its support piers actually to sit in the river bed.

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This cuts down on the effects of erosion caused by running water.

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In a feature which has to do as much with aesthetics as with structural integrity, where they meet, the 11 arches in the second tier have been set directly above those in the base.

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The attention to detail is such that where the arch of the second tier spans the Gard, it too has been lengthened to match the 82 feet of the span below.

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This structural rhythm continues into the top tier, which is composed of 35 arches, each of which is 4.56 metres in length.

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There are three of these smaller arches to every one of the larger, 51-foot arches below.

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The central, 82-foot span across the Gard has four smaller arches above it, so that the vertical proportions which characterise the aqueduct are complete.

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In an effort to cut down on the wind resistance of the structure, each tier in the aqueduct is set slightly in form the one below.

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The Pont du Gard is constructed chiefly of large blocks of cut stone that have been laid together without the use of any mortar or clamps.

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The sections of rough masonry protruding from the sides of the intermediate layer were used initially to hold scaffolding during the construction of the aqueduct.

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After the Pont du Gard had been completed, they were left in position so that workmen would be able to carry out future repairs.

keamy

Pont du Gard 笔记都在了……