Summaries
The 'compaction' vessel
To enhance the loadbearing capacity of the
seabed under the storm-surge barrier itself and
3t the location of the edge of the bottom
evetment, the soil at these sites will have to be
;ompacted. This will be done from a vessel by
hrusting four vibrators simultaneously up till
5 meters deep ormaximallyN.A.P. - 35m into
he soil. From the deepest point onward these
nstruments will be made to vibrate each and
every meter until readings from the motor
;apacity indicate that the soil has sufficiently
ieen compacted. The 'compaction' vessel will
vork off the whole ofthesilland other areas per
section.
The sluice at Noordland
Because of the construction of the storm-surge
>arrier navigation will soon be impinged at the
mouth of the Oosterschelde; and, as after 1982
ardly any shipping traffic will be possible, a
hip lock will be installed in the Oosterschelde-
am. Taking a decision about the dimensions of
1 he ship lock the size of the large floating
construction docks for the Oosterschelde works
ad be to be taken into account. The chamber
will measure 100 x 16 meters; whereas the sill
will be at a depth of N.A.P. -7 m.
oil engineering research concerning the
s torm-surge barrier
he soil engineering research was accelerated
t uring the past year. Especially the load on the
f iers and their subsequent deplacements had to
t e firmly established. A series of tests have
t een made in a model with a scale of 110. An
extensive research into the soil conditions was
made in the centre line at the storm-surge
barrier too. Experimental research was made to
find out how much the subsoil under the barrier
could still be compacted and in what way this
could be done.
Considerations at the selection of the design
levels for the compartment dams
The compartment dams at the rear end of the
Oosterscheldebasin function as secondary
water retaining structures; at the same time
they must divide the salt water from the fresh
water and prevent a tidal movement in the
Schelde-Rhine connection.
These functions as well as the management of
the storm surge barrier made it necessary to
establish at what height the crown of the dams
should be designed. It was recommended to
accept the same height of the partially
strengthened dikes around the Oosterschelde.
A sluice with a built-in shiplift in the Oester
dam
Both ship locks in the compartment dams will
have to be provided with a fresh water/salt
water separation system. The sluices in the
Oester dam, which will be much smaller than
those in the Philips dam, can be installed with a
vertical shiplift. This lock will only allow for a
minimum amount of fresh water respectively
salt water intrusion.
The useful length will be 90 meters; in some
cases, when no use is being made of the
separation system, a ship with a length of
115 meter could enter.
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