独木桥
独木桥是由单根树干或木板制作成的简易木制梁桥[1]，是人类最早发明的桥梁，主要用来让步行者或牲畜跨越较窄的河流和峡谷[2]，通常在能就地获得木料但难以进行土木工程作业的偏远山地和丛林地区十分常见。
独木桥因其长度和宽度限制，通行能力十分有限，而且因为木料会受到风化和生物（真菌和木食性动物，如白蚁等昆虫）的侵蚀，通常使用寿命也较短[3]。如果使用经过化学加工处理的木料，并在两端接触地面的支柱位置采用排水较好的增高地基，则可以显著延长其使用寿命[4]。
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斯洛伐克天堂国家公园里装有踏板的独木桥 -
参考
[编辑]- ^ National Parks Conference, Department of the Interior. Proceedings of the National parks conference held at Berkeley, California March 11, 12, and 13, 1915. Washington: Government Printing Office. 1915: 60 [March 14, 2010].
(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.
- ^ Bennett, David. The history and development of bridges. Ryall, M. J.; Parke, G.A.R.; Harding, J.E. (编). The manual of bridge engineering (Google books). London: Thomas Telford. 2000: 1 [March 14, 2010]. ISBN 978-0-7277-2774-9.
- ^ National Parks Conference 1915, p. 59. "The chief objection to a log bridge ... is the shortness of its life."
- ^ National Parks Conference 1915, p. 59. "If we can design the abutment so that no moisture can collect under the logs the life of the bridge is materially increased."
