Civil Engineering Reference
In-Depth Information
In general, the 'slowest' activity determines the time required for the comple-
tion process. Speeding up this activity would mean shortening the completion
time. The ultimate completion scenario was realised by optimizing the 'slow-
est' activities.
The scenario provided, amongst other things, for the early installation of the
heat-resistant cladding, the earlier fitting out of the cross connections, moving
forward in time of laying the systems in the cable gallery and the acceler-
ated installation of the other systems.
An important verification point within the scenario was formed by the point
in time in which the boring machines reached the receiving shaft. After the
arrival of the TBM, the whole railway track had to be completely removed
immediately from the tunnel so that the (more flexible) road transport could
be used for carrying out the other activities: installation of the concrete safety
barrier (step barrier), emergency posts and the systems above the road surface.
The road surface had to asphalted as late as possible so as not to obstruct
other activities. And finally, the tunnel systems had to be tested.
Extra personnel, tightening-up procedures
In view of the vital function of the logistics system, the staffing of traffic con-
trol and the maintenance team was extended, additional boring teams were
deployed and procedures were tightened up. Furthermore, the introduction
of an incentive system meant an extra motivation for the borers which was
beneficial for the progress of the boring process.
More time for systematic maintenance; extremely
important for safety
The logistical capacity was extended twice by the acquisition of extra
locomotives. As a result of this, and by deploying extra maintenance staff,
more time and capacity became available for systematic maintenance to the
Construction of
installation building on
top of the caisson
Fig. 14.12
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