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Inca rope bridge
Inca rope bridges were simple suspension bridges over canyons and gorges and rivers (''pongos'') to provide access for the Inca Empire. Bridges of this type were useful since the Inca people did not use wheeled transport—traffic was limited to pedestrians and livestock. The bridges were an integral part on the Inca road system and are an example of Inca innovation in engineering. They were frequently used by Chasqui runners delivering messages throughout the Inca Empire.
==Construction and maintenance ==
The Incas used natural fibers found within the local vegetation to build bridges. These fibers were woven together creating a strong enough rope and were reinforced with wood creating a cable floor. Each side was then attached to a pair of stone anchors on each side of the canyon with massive cables of woven grass linking these two pylons together. Adding to this construction, two additional cables acted as guardrails. The cables which supported the foot-path were reinforced with plaited branches. This multi-structure system made these bridges strong enough to even carry the Spaniards while riding horses after they arrived. The design naturally sags in the middle.
Part of the bridge's strength and reliability came from the fact that each cable was replaced every year by local villagers〔(''"Each bridge is usually kept up by the municipality of the nearest village; and as it requires renewal every two or three years..."'' ), page 545 "Peru: Incidents of Travel and Exploration in the Land of the Incas", 1877, E. G. Squier〕 as part of their ''mit'a'' public service or obligation. In some instances, these local peasants had the sole task of maintaining and repairing these bridges so that the Inca highways or road systems could continue to function.
The repair of these bridges was dangerous, to the degree that those performing repairs often met death. An Inca author praised Spanish masonry bridges being built, as this made the need to repair the rope bridges moot.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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