جسر معلق: الفرق بين النسختين

 

{{For|الجسور حيث مسطح الجسر يتبع الركائز الحاملة| جسر بسيط معلق}}

 

The [[Tibetan people|Tibetan]] saint and bridge-builder [[Thangtong Gyalpo]] originated the use of [[wrought iron|iron]] chains in his version of early suspension bridges. In 1433, Gyalpo built eight bridges in eastern [[Bhutan]]. The last surviving chain-linked bridge of Gyalpo's was the Thangtong Gyalpo Bridge in [[Duksum]] en route to [[Trashi Yangtse]], which was finally washed away in 2004.<ref>{{cite book|title=Bhutan|publisher=Lonely Planet|url=http://books.google.com/books?id=s-L8NUlW_QgC&pg=PA131&dq=Thangtong+Gyalpo+suspension+bridge#v=onepage&q&f=false|isbn=978-1-74059-529-2|year=2007}}</ref> Gyalpo's iron chain bridges did not include a [[suspended deck bridge]] which is the standard on all modern suspension bridges today. Instead, both the railing and the walking layer of Gyalpo's bridges used wires. The [[stress (mechanics)|stress points]] that carried the screed were reinforced by the iron chains. Before the use of iron chains it is thought that Gyalpo used ropes from twisted willows or yak skins.<ref>{{cite web|title=Chakzampa Thangtong Gyalpo|publisher=Centre for Bhutan Studies|page= 61|url=http://archiv.ub.uni-heidelberg.de/savifadok/volltexte/2009/311/pdf/Chakzampa.pdf}}</ref> He may have also used tightly bound cloth.