Why are manholes round in shape ?

♠ Posted by GeekyFry in ,, at 10:11 AM

Why are manholes round in shape ?



Possible Solutions:
  • A round manhole cover cannot fall through its circular opening, whereas a square manhole cover may fall in if it were inserted diagonally in the aperture.
  • The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.
  • Round castings are much easier to machine using horizontal boring mills.
  • Circular covers do not need to be rotated to align them when covering a circular manhole.
  • Human beings have a roughly circular cross-section.
  • A round manhole cover can be more easily moved by being rolled.
  • If an automobile rolls over a dislodged manhole of another shape, the sharp corners could puncture the automobile’s tire, whereas a circle doesn’t have corners.
  • It’s easier to dig a circular hole.
  • Tradition

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