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For other uses, see Manhole (disambiguation).
PMG manholes in a city street, Perth, Western Australia.
Manhole in Belo Horizonte, Brazil.
This is a sewer manhole, exposed during construction. Typically, only the top ring and manhole cover (not pictured) would be visible.
Manhole cover of precast concrete in Germany

A manhole (alternatively utility hole, cable chamber, maintenance hole, inspection chamber, access chamber or confined space) is the top opening to an underground utility 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.

Usage[edit]

Manhole closings are protected by a manhole cover (also known as a "biscuit"[citation needed]), a flat plug designed to prevent accidental or unauthorized access to the manhole. Those plugs are traditionally made of metal, but may be constructed from precast concrete, glass reinforced plastic or other composite material (especially in Europe, or where cover theft is of concern).

Manholes are usually outfitted with metal, polypropylene, or fiberglass steps installed in the inner side of the wall to allow easy descent into the utility space. Because of legislation restricting acceptable manual handling weights, Europe has seen a move toward lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and electrical insulating properties.

The access openings are usually circular in shape to prevent accidental fall of the cover into the hole.

Manholes are generally found in urban areas, in streets and occasionally under sidewalks. In rural and undeveloped areas, services such as telephone and electricity are usually carried on utility poles or even pylons rather than underground.

Composite manholes[edit]

Composite (fiberglass) manholes are commonly used in applications where infiltration, exfiltration, or corrosion by hydrogen sulfide (from sewer gas) are a concern, or where structures need to be factory integrated into a manhole before placement.

Structures commonly integrated into composite manholes include:

  • Flow inverts[1]
  • Flumes[2]
  • Drop structures from higher elevation flows to lower elevation discharge pipes

Occasionally, composite manholes will integrate:

  • Weirs[3]
  • Storm water screening structures[4]
  • Sewage grinders[5]
  • Energy absorbing structures to dissipate undesirable flow stream turbulence or velocity[6]

Hazards caused by stray voltage in manholes[edit]

In urban areas, stray voltage issues have become a significant concern for utilities. In 2004, Jodie S. Lane was electrocuted after stepping on a metal manhole cover, while walking her dog in New York City.[7] One solution is the Electrified Cover Safeguard invention, which is an on-site, real-time stray voltage warning system which is being used in the street lights in New York City and is also being tested by ConEd and other utilities and municipalities in England, Europe, and Japan.[citation needed]

See also[edit]

Notes[edit]

References[edit]

  • Isles, Paul (2010). "Dover Engineering Works". Dover Life Magazine

Further reading[edit]

  • Ascher, Kate ; researched by Wendy Marech (2007). The works : anatomy of a city (Reprint. ed.). New York: Penguin Press. ISBN 978-0143112709. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Manhole — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
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5836 news items

fox13now.com

fox13now.com
Mon, 28 Jul 2014 18:42:25 -0700

SALT LAKE CITY — Two man hole covers dislodged after an underground electrical vault blew Monday night, according to fire officials. At approximately 6:40 p.m., Salt Lake City Fire responded to the scene and discovered smoke dissipating from the holes ...
 
Wilkes Barre Times-Leader
Tue, 29 Jul 2014 09:58:43 -0700

The state Department of Environmental Protection regional office in Wilkes-Barre and Dickson City police initiated the investigation based on a complaint that a tanker truck was dumping sewage in a manhole behind a shopping center on Cold Springs Road ...

The Herald | HeraldOnline.com

The State
Tue, 29 Jul 2014 15:18:45 -0700

ROCK HILL --- Gallons of raw sewage spewed from a manhole in the woods behind a Rock Hill apartment complex Tuesday afternoon, spilling into a nearby creek and muddying parts of the landscape. When officials first arrived on the scene, the sewage flow ...

News 12 Bronx (registration)

News 12 Bronx (registration)
Tue, 29 Jul 2014 11:11:09 -0700

THE BRONX - A smoking manhole knocked out power to part of the South Bronx, temporarily bringing some subway trains to a standstill. The MTA says service has been restored to the No. 2 and 5 trains in both directions. The outage occurred near the 149th ...

News 12 Bronx (registration)

News 12 Bronx (registration)
Tue, 29 Jul 2014 10:37:30 -0700

THE BRONX - A manhole explosion knocked out power to part of the South Bronx, temporarily bringing some subway trains to a standstill. The MTA says limited service has been restored to the 2 and 5 trains in both directions between 149th Street-Grand ...

CBS Local

WDIV Detroit
Thu, 24 Jul 2014 01:49:57 -0700

AT 6:44, WE'LL GIVE YOU A UPDATE ON CONSTRUCTION. Evrod: WE'RE FOLLOWING BREAKING NEWS OUT OF DETROIT'S WEST SIDE THIS MORNING. THAT'S WHERE A MAN'S BODY HAS BEEN FOUND INSIDE A MANHOLE ON THE I-96 ...

Irish Times

Irish Times
Fri, 25 Jul 2014 04:11:20 -0700

An Eircom manhole cover exploded this morning on Baggot Street in Dublin city centre, after emitting thick green smoke for about an hour. No one was hurt in the explosion, which occurred at the corner of Merrion and Baggot Streets in front of Lolly and ...

stv.tv

stv.tv
Tue, 29 Jul 2014 07:50:13 -0700

Firefighters have rescued a workman who plunged 26ft down a manhole at an Aberdeenshire school. The man fell down the one metre-wide hole at a building site at the new Drumoak Primary School. Two fire engines from Banchory and a specialist team ...
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