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  Mechanized solutions for cross passage construction

  With the growing world population and the rising transport volume, intelligent underground tunnel solutions become a necessity. At the same time, safety is becoming an increasingly important aspect in planning of these infrastructures. One of the measures in discussion is the construction of cross passages, mostly between parallel tunnels. In general, these tunnels are very short but their construction can be highly demanding especially in poor ground conditions and can have a big impact on the overall program. Various concepts have been worked out in relation to tunnel size, geology and hydrology. Cross passages in water bearing ground with high water pressure are a special challenge. In the past, this could often only be realized with the help of ground freezing methods or with extensive grouting and consolidation measures. Mechanized approaches have been completed successfully in the past driven by the new increased demand, TBMs for cross passages are now discussed more often as a real alternative to save time and cost.

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