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Tunnelling shield - Wikipedia

Boulder or hard rock shield tunneling machine This is a shield machine that can crush boulders and bedrock at the face in order to make it possible to excavate ground that contains boulders or bedrock.

Tunnel boring machine - Wikipedia

TUNNEL BORING MACHINE (TBM) METHOD. There are two major shield methods around: earth pressure balanced (EPB) and slurry type shield machine. Selection of shield method depends on ground conditions, surface conditions, dimensions of the tunnel section, boring distance, tunnel alignment and construction period.

Shield tunneling machines | Products | Hitachi Zosen ...

Herrenknecht offers the broadest and deepest portfolio in mechanized tunnelling. Find the right products for your project here. This website uses cookies. ... We take care that your machine arrives at the jobsite and starts tunnelling in time. ... EPB Shield. TBM for cohesive soils with high silt or clay content and low water permeability. 3. VSM.

Tunneling and TBM Method - p3planningengineer.com

A shield tunneling machine having incorporated therein an earth removing apparatus which comprises a tubular casing having an earth inlet at one end and a closable earth outlet at the other end, and an earth transport conveyor rotatably provided within the casing and comprising a helically twisted strip.

Tunnelling Technology & Equipment - herrenknecht.com

A shield tunneling machine comprises a shield body provided with a tubular head portion and a tubular tail portion disposed behind the head portion. The head portion and tail portion are interconnected by a plurality of thrusting jacks for moving both portions to and away from each other.

US4456305A - Shield tunneling machine - Google Patents

Tunneling shield, 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 and water from seeping in and collapsing the tunnel heading.

US4655493A - Shield tunneling machine - Google Patents

Shield Tunneling Machine is a large high-tech comprehensive construction equipment for tunneling project. The shield is equipped with excavation, drainage, assembly and propulsion machinery. The construction of tunnel structure is completed by the series operation of soil excavation, ballast-soil transportation, lining assembly and shield ...

Tunneling shield | engineering | Britannica.com

Shield tunneling is the excavation method best suited to conditions in Japan, where space is short, soft alluvial deposits are widespread, and the demand for tunnels is high. Developments in shield tunneling have con-tributed greatly to urban infrastructure develop-ment in this country.