• no banana@lemmy.world
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    29 days ago

    I have never thought about the fact that manhole covers need to hold up to weight. Of course they do and it’s perfectly normal and sensible. It’s just not a thought I’ve ever had.

    • 9point6@lemmy.world
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      29 days ago

      Technically it’s the manhole covers that need to support the weight.

      Manholes themselves are expected to do the opposite of holding weight

      • grue@lemmy.world
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        29 days ago

        Technically, the walls of the manholes, in turn, support the weight of the cover and whatever load is on top of it. The entire manhole is a weight-bearing structure.

    • Whelks_chance@lemmy.world
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      29 days ago

      For formula one races they weld them down to stop the cars incredible downforce from sucking them up into the air. Even then they sometimes get torn up and thrown around.

      Very important to take them seriously.

    • x00z@lemmy.world
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      29 days ago

      Manhole covers are also a common exercise for engineering students. Like designing one that can hold x amount of weight with a specific set of limitations and/or requirements.

  • Red_October@lemmy.world
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    29 days ago

    Obviously in the dystopia of Night City, lighter weight manhole covers were approved for road use purely to cut costs, and any deformed or destroyed covers have the cost offloaded to the poor rube who last ran them over.

  • jaybone@lemmy.world
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    29 days ago

    These numbers don’t align though. 4271 is not a Bxxx or Dxxx and also isn’t on that diagram on the left. I’m so confused rn.