FACTOID # 115: American planes take-off a staggering 8.5 million times per year - almost half the number of take-offs worldwide.
 
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Encyclopedia > Manholes

A manhole or maintenance hole is the top opening to an underground vault used to house an access point for making connections or performing maintenance on underground and buried public utility and other services including sewers, telephone, electricity, storm drains and gas. It is protected by a manhole cover, a (usually metal) plug designed to prevent accidental or unauthorised access to the manhole.


Manholes are generally found in urban areas, in streets and occasionally under sidewalks.


In rural and undeveloped areas, services such as telephone and electric are carried on pylons.


  Results from FactBites:
 
Manhole Cover - Background, History, Raw Materials, Design, The Manufacturing (2161 words)
Manhole covers are the round iron plates sunk into streets and sidewalks that keep passers-by from falling into manholes.
Manhole covers must be a minimum of 22 in (56 cm) in diameter, but can be as much as 60 in (1.5 m) in diameter.
Manhole lids are heavy because of the material they are made from and because it makes them difficult to remove, not to prevent gas from escaping.
Manhole Covers (1026 words)
Bobbi Mastrangelo, The “Grate Artist”, is internationally known for her unique creations based on the theme of manhole covers.
Manhole covers were designed to provide access to underground utilities such as power, sewerage, gas, telephone etc. Beneath them lies a surface tunnel, with labyrinthine corridors connected.
By doing that she lifted the heavy manhole and was courageous enough to go back down into the labyrinthine corridors.
  More results at FactBites »


 

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