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Bridge that uses logs that fall naturally or are intentionally felled or placed across streams
A log bridge is a timber bridge that uses logs[1] that fall naturally or are intentionally felled or placed across streams. The first man-made bridges with significant span were probably intentionally felled trees.[2]
The use of emplaced logs is now sometimes used in temporary bridges used for logging roads, where a forest tract is to be harvested and the road then abandoned. Such log bridges have a severely limited lifetime[3] due to soil contact and subsequent rot and wood-eating insect infestation.
Longer lasting log bridges may be constructed by using treated logs and/or by providing well drained footings[4] of stone or concrete combined with regular maintenance to prevent soil infiltration. This care in construction can be seen in the French bridge illustrated below, which has well locked dry set stone abutments and a footpath leveled with boards.
Various log bridge designs[edit]Log bridge over a river in
Papua New GuineaLog bridge in
Zaire, made of multiple parallel logs
Log bridge over the
Nisqually River, United States, made of one large log with handrail
Log bridge in
Switzerlandwith flattened top and handrail
Log bridge in
Slovakiawith additional boards on top
Log bridge in Slovakia with additional logs laid crosswise (a
beam bridge)
Log bridge in
Francewith dry set stone abutments and a footpath leveled with boards
Complex
Tibetanlog bridge made of multiple logs (a
cantilever bridge)
Media related to Log bridges at Wikimedia Commons
(A log bridge) is a bridge composed of log beams, the logs being in natural condition or hewn, which are thrown across two abutments, and over which traffic may pass.
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