Observing a construction schedule, which had already been drawn up at the estimation stage, and carrying out sound preparation lead to a linear construction site largely characterised by the lean allocation and eco-nominal use of resources. Despite the simultaneous excavat on work and construction of inner lining, only 50 men were employed in the tunnel.rnThis parallel operation was only made possible by the bridge that was constructed so that it could be used as formwork and equipment bearer and as a concrete dis-distribution beam at the same time.rnConstruction conditions were, of course, also appropriate and the inner lining could be constructed without obstruction from ventilation ducts, as the pilot tunnel was used for ventilation.rnLast but not least, the constructive interaction between clients, designer, site supervision and Joint Venture produced the successful conclusion to construction that had been hoped for.
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