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Mt. Lebanon Tunnel

The Mt. Lebanon Tunnel is a light rail tunnel in Allegheny County, Pennsylvania, also known as the Dormont/Mt. Lebanon Transit Tunnel, part of the Pittsburgh Light Rail system.

Mt. Lebanon Tunnel
South end
Overview
Line
  Red Line – Castle Shannon
  Red Line – South Hills Village
LocationAllegheny County, Pennsylvania
Statusoperational
SystemPittsburgh Light Rail
StartDormont Junction
EndMt. Lebanon
No. of stations0
Operation
ConstructedNew Austrian Tunnelling method
OwnerPort Authority of Allegheny County
OperatorPort Authority of Allegheny County
Technical
Length3,000 feet (910 m)
No. of tracks2
Track gauge5 ft 2+12 in (1,588 mm)
Electrifiedoverhead catenary

The 3,000-foot (910 m) long tunnel connects the Dormont Junction and Mt. Lebanon stations beneath Washington Road & West Liberty Ave. from Shady Drive East to McFarland Road at a maximum depth of 100 feet (30 m), and runs beneath a cemetery.

The pre-tunnel trolley street line, which ended in 1984, ran from the long-removed Clearview Loop stop on Alfred St. (Mt. Lebanon) to the intersection of McFarland Rd. and Raleigh Ave. (Dormont).

The tunnel was constructed by a technique called the New Austrian Tunnelling method, a tunneling process developed in the early 1960s that has become the primary tunneling practice in Europe. This is the first time that this money-saving technique was used for transit construction in the United States.[1]

The difference with NATM lies in the means of support required to maintain the rock cavity and the configuration of the tunnel structure. With conventional tunneling, support of the rock cavity consists of a rib cage framework of steel beams and horizontal wooden planks. A reinforced steel concrete lining is added to create a perfectly shaped tunnel. With NATM, the rock surrounding the hole becomes the support system. This is done by lining the tunnel cavity with several thin layers of shotcrete, concrete that is blown on under air pressure.[2]

The tunnel has continuous television surveillance.[3]

References edit

  1. ^ Ozdemir, Levent (17–22 April 2004). North American tunneling: proceedings of the North American Conference Tunneling Conference 2004. CRC Press. p. 473. ISBN 9789058096692.
  2. ^ "Mt. Lebanon Tunnel: What Went Wrong". Tunnels & Tunnelling. 21 (4): 61–62. April 1989.
  3. ^ Joe Grata (10 July 2005). "Getting Around: In Pittsburgh's mini-subway, eyes are always watching". Pittsburgh Post Gazette. Retrieved 1 March 2009.

External links edit


lebanon, tunnel, confused, with, washington, transit, tunnel, another, tunnel, pittsburgh, light, rail, system, light, rail, tunnel, allegheny, county, pennsylvania, also, known, dormont, lebanon, transit, tunnel, part, pittsburgh, light, rail, system, south, . Not to be confused with Mt Washington Transit Tunnel another tunnel of the Pittsburgh Light Rail system The Mt Lebanon Tunnel is a light rail tunnel in Allegheny County Pennsylvania also known as the Dormont Mt Lebanon Transit Tunnel part of the Pittsburgh Light Rail system Mt Lebanon TunnelSouth endOverviewLine Red Line Castle Shannon Red Line South Hills VillageLocationAllegheny County PennsylvaniaStatusoperationalSystemPittsburgh Light RailStartDormont JunctionEndMt LebanonNo of stations0OperationConstructedNew Austrian Tunnelling methodOwnerPort Authority of Allegheny CountyOperatorPort Authority of Allegheny CountyTechnicalLength3 000 feet 910 m No of tracks2Track gauge5 ft 2 1 2 in 1 588 mm Electrifiedoverhead catenaryThe 3 000 foot 910 m long tunnel connects the Dormont Junction and Mt Lebanon stations beneath Washington Road amp West Liberty Ave from Shady Drive East to McFarland Road at a maximum depth of 100 feet 30 m and runs beneath a cemetery The pre tunnel trolley street line which ended in 1984 ran from the long removed Clearview Loop stop on Alfred St Mt Lebanon to the intersection of McFarland Rd and Raleigh Ave Dormont The tunnel was constructed by a technique called the New Austrian Tunnelling method a tunneling process developed in the early 1960s that has become the primary tunneling practice in Europe This is the first time that this money saving technique was used for transit construction in the United States 1 The difference with NATM lies in the means of support required to maintain the rock cavity and the configuration of the tunnel structure With conventional tunneling support of the rock cavity consists of a rib cage framework of steel beams and horizontal wooden planks A reinforced steel concrete lining is added to create a perfectly shaped tunnel With NATM the rock surrounding the hole becomes the support system This is done by lining the tunnel cavity with several thin layers of shotcrete concrete that is blown on under air pressure 2 The tunnel has continuous television surveillance 3 References edit Ozdemir Levent 17 22 April 2004 North American tunneling proceedings of the North American Conference Tunneling Conference 2004 CRC Press p 473 ISBN 9789058096692 Mt Lebanon Tunnel What Went Wrong Tunnels amp Tunnelling 21 4 61 62 April 1989 Joe Grata 10 July 2005 Getting Around In Pittsburgh s mini subway eyes are always watching Pittsburgh Post Gazette Retrieved 1 March 2009 External links edit nbsp Media related to Mt Lebanon Tunnel at Wikimedia Commons 40 22 59 N 80 02 36 W 40 38293 N 80 04322 W 40 38293 80 04322 Southern portal 40 23 25 N 80 02 29 W 40 39035 N 80 04146 W 40 39035 80 04146 Northern portal nbsp This article about transportation in Pennsylvania is a stub You can help Wikipedia by expanding it vte nbsp This United States tunnel related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Mt Lebanon Tunnel amp oldid 879723059, wikipedia, wiki, book, books, library,

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