Acquista:
During the last decades, the application range of Slurry Microtunnelling has been considerably extended and more demanding projects have been executed for underground utilities, pipeline and cable installations. In small-diameter rock tunnelling, the continuous further development of technologies plays a key role to overcome the limitations in drive length and to improve performance. Nevertheless, the ground conditions still play a key role and determine the limits for alignment design and the possible use of the different trenchless construction methods. Technological features, like adapted cutting wheel design, bentonite lubrication or anti-roll solutions help to overcome these limitations. In hard rock conditions, the applicability of Slurry Microtunnelling has been especially limited in the non-accessible diameter range in the past. With the new AVN 800 HR for hard rock, Herrenknecht has developed a machine concept, enabling drives of up to 200 meters without interventions, as proven in internationally referenced projects.
Keywords: pipe jacking, slurry microtunnelling, hard rock.
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