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A careful and thorough
preparation and scheduling is absolutely necessary in
order to manage such a big project within a certain limit of
time. The Dutch, real
experts in that field, proved their ability once again and realized the
project as planned.
The cable pulling job was
done by company Hogenboom, who designed a special type of cable drum transport and laying truck. Which means
that the loading and spooling frame is mounted on a crawling type undercarriage and
the clear loading width of this truck is adjustable in order to handle drums with
different diameters.
The cable drums, produced
by the Finnish cable factory Nokia, were delivered to
the building site by ship and then loaded onto the special
crawler truck.
In cooperation with its Dutch agency HMS in Gouda,
Bagela equipped a capstan winch type RW 20 with 1500m rope. Furthermore the
pulling force had been limited to 150kN.
The cable should be
pulled in with a pulling force limited to 95kN. The
disconnecting value in the electronic printer was also set to 95kN.
That way the pulling process would immediately be stopped if that value was reached. But
attention had to be paid to the fact that a higher pulling force would be needed in case
of a restart.
Bagela winches type RW and RKW are additionally equipped
with a hydraulic static pull system. By using this system the cable will be kept
tensioned although if the pulling process is stopped. When pulling resistance falls the
pulling process will be continued.
That means there is no problem to use cable pusher or
spooling equipment – the winch pulls constantly without any variation.
The Amsterdam project was
only one example that cables can be pulled, in not exceeding certain pulling force limits without any problem.
This was an succesful
start on the way to higher dimensions. |
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