Special features of scheduling tunnel works - Tunnel Engineering: Basics and Additional Services for Design and Construction - page 291

years and five months and handed over for opening. The tunnel provides a winter connec-
tion between the Austrian states of Tyrol and Vorarlberg.
The individual alignment proposals and variants, the cross-sectional sizes, ramps, start-
ing tunnel, ventilation concept and further aspects will not be described at this point. This
can be found in the relevant literature, for example the construction documentation of the
Arlberg Straßentunnel AG [7]. What will be described is the interaction of the scheduling
of the project and the construction of the works in the phases of
- tendering,
- bid and award,
- construction.
Progress according to tender. The concept of construction progress shown in Fig. 7-11 is
based on the advance rates to be achieved in continuous operation. The following advance
rates were demanded from the bidders:
- Starting tunnel 130 m/month
- Main Tunnel East 135 m/month
- Main Tunnel West 105 m/month
For the two shafts, advance rates of 50 m/month were intended.
Figure 7-11 Construction
schedule. Arlberg Tunnel
tender [10].