Civil Engineering Reference
In-Depth Information
Fig. 2.9
Alternative of
bored tunnel with a
single tube (distances/
dimensions in
millimetres)
13,500
12,600
450
450
150
10 0
150
3,500
2,750
Escape
corridor
Cable
gallery
Fig. 2.10
Bored tunnel with twin
tubes with a small
diameter
(distances/dimensions
in millimetres)
11,000
10,100
∼
12,000
11,000
10,100
450
450
450
450
150
100
3,500
150
3,500
Cross connection - 500 m
(250 m)
Cable gallery
Private financing halts, government decides:
1995-1996
The alternative of the smaller twin-tubed tunnel meant a substantial cost
reduction in respect of the original design and was further elaborated upon.
Yet the project threatened to come to a halt again: the private financiers
set - in view of the possible risks such as a lesser number of vehicle passes
than expected, or lower toll tariffs than desired - high demands on the yield
insofar as they were prepared to take over risks.
The government therefore had to make a choice regarding the initiative to
construct, either to take it on themselves or to continue contributing towards
the operation of the ferries. Continuation including replacement of the fer-
ries would cost the government about 24 million euro per annum for years
to come, and that is not even counting the maintenance costs of the ferry
harbours and the replacement of the ferries. On the other hand there was
the prospect that the construction costs of the tunnel would have been
paid back after 30 years through an income from toll charges, and then only
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