Civil Engineering Reference
In-Depth Information
The control container as well as the air compressors with driers, standby
generator and the emergency compressor were mounted on the middle deck.
The grease system for the tail seal was also located here. The lower deck
housed the grout containers and grout pumps.
The platform carriages - trailer 2 and further
The platform carriages were located behind the second carriage, as already
mentioned above the platform connected at the same height as the upper
decks of the first two trailers. The platform carriages were also fitted with a
continuous track on which the crane travelled that hoisted the tunnel seg-
ments from the tunnel train to the intermediate storage. The flexible cou-
pling of the forward moving pipes supplying the bentonite (and discharging
the bentonite-soil mixture) to the fixed pipes in the tunnel was located on
the last platform carriage. Here the cable reels were also fitted with service
pipes for the high-voltage line and water supply and discharge.
2,000
(a)
1
PLATTFORM 3
PL
PLATTFORM 2
(b)
The roadbed was laid under the platform carriages with the cable gallery incor-
porated into it. An overhead travelling crane put the cable gallery elements in
position and supplied the sand-cement stabilization for the construction of the
roadbed. The narrow-gauge railway for the tunnel train was laid on the cable
gallery. The total length of the platform carriages was chosen so that a com-
plete tunnel train was always able to park under the platform carriages.
Fig. 14.10a and b
Artist's impression of
the tunnel boring
machine including the
trailers and platform
carriages
Optimizations and acceleration operation
A number of problems had occurred right from the start of the boring process,
which together gave rise to a delay of at least 8 months. This meant that the
penalty clause included in the contract (penalty of 136,000 euro for each day
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