Substantial schedule advantages can be made on projects if cross passage construction can occur at the same time as TBM operation with little or no impact on TBM logistics. However, this approach can prove difficult to achieve with many of the more cost-effective means of supporting the segmental lining during cross passage break-out. This paper discusses the constraints and shortcomings of conventional approaches, and describes how a cost effective solution involving a shotcrete shell and opening constructed inside the segmental was designed and constructed to deliver cost and time savings on Seattle University Link contract U220.
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