tunneling shield

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• tunneling shield — ▪ engineering  machine for driving tunnels in soft ground, especially under rivers or in water bearing strata. The problem of tunneling under a river had defied the engineering imagination for centuries because of the difficulty of preventing mud …   Universalium

• Shield — Shield, n. [OE. sheld, scheld, AS. scield, scild, sceld, scyld; akin to OS. scild, OFries. skeld, D. & G. schild, OHG. scilt, Icel. skj[ o]ldr, Sw. sk[ o]ld, Dan. skiold, Goth. skildus; of uncertain origin. Cf. {Sheldrake}.] 1. A broad piece of… …   The Collaborative International Dictionary of English

• Shield fern — Shield Shield, n. [OE. sheld, scheld, AS. scield, scild, sceld, scyld; akin to OS. scild, OFries. skeld, D. & G. schild, OHG. scilt, Icel. skj[ o]ldr, Sw. sk[ o]ld, Dan. skiold, Goth. skildus; of uncertain origin. Cf. {Sheldrake}.] 1. A broad… …   The Collaborative International Dictionary of English

• Tunnelling shield — A tunnelling shield is a protective structure used in the excavation of tunnels through soil that is too soft or fluid to remain stable during the time it takes to line the tunnel with a support structure of concrete, cast iron or steel. In… …   Wikipedia

• Metro Tunneling Group — Delhi MRTS Info Locale Delhi, India Transit type Rapid transit Number of lines 3 Number of stations 2 …   Wikipedia

• Hotspot Shield — Hotspot Shield …   Википедия

• tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

• Greathead, James Henry — ▪ British engineer born Aug. 6, 1844, Grahamstown, S.Af. died Oct. 21, 1896, London, Eng.  British civil engineer who improved the tunneling shield, the basic tool of underwater tunneling, essentially to its modern form.       Greathead arrived… …   Universalium

• Tower Subway — The Tower Subway is a tunnel beneath the River Thames in central London, close as the name suggests to the Tower of London. Its alignment runs between Tower Hill on the north side of the river and Vine Lane (off Tooley Street) to the south. Its… …   Wikipedia

• James Henry Greathead — Infobox Engineer image size = caption = Statue of Greathead in London which was only erected in 1994 name = James Henry Greathead nationality = birth date = 6 August 1844 birth place = Grahamstown, South Africa death date = 21 October1896 death… …   Wikipedia

• Beach, Alfred Ely — ▪ American publisher and inventor born September 1, 1826, Springfield, Massachusetts, U.S. died January 1, 1896, New York, New York       American publisher and inventor whose Scientific American helped stimulate 19th century technological… …   Universalium