Civil Engineering Reference
In-Depth Information
Figure 9-8
Cross-section with safety niches -
conventional tunnelling.
The construction of box and safety niches for shield tunnelling is shown in Figs. 9.9 and
9.10, which demands the opening of the segment lining shown in Fig. 9-9. The box niche
can be integrated into the existing structure gauge of the segment ring.
Figure 9-9
Cross-section with safety niches - shield tunnelling.
Figure 9-10
Cross-section with
box niches - shield tunnelling.
9.3.3 Additional requirements for mechanised tunnelling in the
tender documents
The following section describes the necessary geotechnical information, which should
be included in tender documents in order to enable alternative proposals for mechanised
tunnelling. The basic design concepts for mechanised tunnelling and the design of the
structure are summarised. Finally, the requirements for the tender documents and contract
are described. Fair competition between the two methods is only possible on the basis of
these criteria.
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