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  2. Manhole cover - Wikipedia

    en.wikipedia.org/wiki/Manhole_cover

    Manhole cover theft can be a serious problem in China, where missing manhole covers caused at least eight deaths in 2004. [20] According to China's Xinhua News Agency, about "240,000 manhole and street-drain covers were stolen in Beijing in 2004." [21] In China Shakes the World, James Kynge describes the phenomenon:

  3. Macadam - Wikipedia

    en.wikipedia.org/wiki/Macadam

    The importance of the 2 cm stone size was that the stones needed to be much smaller than the four-inch (10 cm) width of the iron carriage wheels that travelled on the road. [ 5 ] McAdam believed that the "proper method" of breaking stones for utility and rapidity was accomplished by people sitting down and using small hammers, breaking the ...

  4. Manhole - Wikipedia

    en.wikipedia.org/wiki/Manhole

    Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially where cover theft is of concern ...

  5. Trench drain - Wikipedia

    en.wikipedia.org/wiki/Trench_drain

    The drain is characterized by its long length and narrow width, the cross-section of the drain is a function of the maximum flow volume anticipated from the surrounding surface. Channels can range from 1 inch (2.5 cm) to 2 feet (61 cm) in width, while depths can reach up to 4 feet (120 cm).

  6. Expansion joint - Wikipedia

    en.wikipedia.org/wiki/Expansion_joint

    They stop the bridge from bending out of place in extreme conditions, and also allow enough vertical movement to permit bearing replacement [1] without the need to dismantle the bridge expansion joint. There are various types, which can accommodate movement from 30 to 1,000 millimetres (1.2 to 39.4 in), including joints for small movement ...

  7. Verstappen calls on F1 tracks to 'double-check' safety after ...

    www.aol.com/news/loose-drain-cover-stops-f1...

    Max Verstappen called for Formula 1 venues to “double-check” the safety of objects around the track after a loose drain cover interrupted preseason testing for the second day running Friday.

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