English translation: (tunnel boring machine with) shield
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20:53 Sep 7, 2006
German to English translations [PRO] Tech/Engineering - Construction / Civil Engineering
German term or phrase:Schildmaschine
Die Einhaltung der geplanten Tunnelachse durch die Schildmaschine ist im Zusammenhang mit der Einhaltung der zulässigen Setzungen eher von untergeordneter Bedeutung. Mit Hilfe des Vermessungssystems der Schildmaschine und des Einsatzes erfahrener Schildfahrer sollten jedoch extreme Richtungsänderungen infolge von Kurskorrekturen vermieden werden, da diese wiederum Setzungen verursachen können.
Tunnelvortriebsmaschinen gibt es in verschiedenen Bauweise, z.B. mit Schild (tunneling 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 or steel. In effect, the shield serves as a temporary support structure for the tunnel while it is being excavated.
A tunnel boring machine (TBM), consists of a shield (a large metal cylinder) and trailing support mechanisms.
At the front end of the shield a rotating cutting wheel is located. Behind the cutting wheel there is a chamber where, depending on the type of the TBM, the excavated soil is either mixed with slurry (so-called slurry TBM) or left as-is (earth pressure balance or EPB shield). The choice for a certain type of TBM depends on the soil conditions. Systems for removal of the soil (or the soil mixed with slurry) are also present.
Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods. A TBM has the advantages of not disturbing surrounding soil and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in built-up areas. The key disadvantage is cost.