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Bridges of the Mediterranean

机译:地中海的桥梁

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摘要

The Earliest Bridges Are Gen- erally believed to have been found structures, in that they were fortuitous arrangements of stones, felled tree trunks or hanging vines that provided a more-or-less convenient way for people to cross a stream without getting their feet wet. These chance crossings naturally led to the deliberate placing of flattish stepping stones, the manipulation of straight logs, and the rearrangement and draping of vines to gain improved footing or reach at the most desirable locations. The evolution from such elementary improvements led in time to the placing of longer stones on narrower ones to produce what are known as clapper bridges; the division of logs into timbers to produce wooden bridges with flat and level decks; and the braiding and anchoring of vines to make the main drooping cables of primitive suspension bridges.
机译:一般认为,最早的桥是在建筑物中发现的,因为它们是石头,倒塌的树干或垂悬的葡萄树的偶然布置,为人们越过溪流而又不弄湿脚提供了一种或多或少的便捷方式。这些偶然的穿越自然会导致故意放置平坦的垫脚石,操纵平直的原木以及重新布置和悬垂藤蔓,以改善立足点或到达最理想的位置。这种基本改进的演变及时导致了将较长的石头放置在较窄的石头上,以生产所谓的拍板桥。将原木分为木材,以生产具有平坦和水平甲板的木桥;以及藤蔓的编织和锚固,从而形成原始悬索桥的主要下垂电缆。

著录项

  • 来源
    《American Scientist》 |2011年第1期|p.15-19|共5页
  • 作者

    Henry Petroski;

  • 作者单位

    Box 90287, Durham, NC 27708;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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