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If a municipality builds a drawbridge, then many years later finds that the road
and waterway are quite a bit busier than they used to be, one might question
the
wisdom of saving costs with a short and movable bridge when a tall and
stationary bridge might make more sense. However, tearing down
an old
bridge
and rebuilding it is costly and can be politically unpopular.
Herein, I intend to present a way to handle tall maritime traffic under a short
bridge. First, the waterway under the bridge is deeply dredged. Then, a
rectangular wall is built from the floor of the river to a height well above
the highest water level that might ever be expected. The rectangular region
is enclosed by two long walls that run parallel to the ship's direction of
travel and are placed far enough apart to accommodate the widest ship
expected. Perpendicular to the ship's travel are two hydraulic locks, one
on each end. First, the tall ship enters the lock. Next, water is pumped out to
facilitate clearance. Third, the ship travels through. Fourth, the
river is allowed to flood the locks. Finally, the ship continues on its way.
Illustration A
https://encrypted-t...XoBNR9UIZuT-wyO1sCA [not_morrison_rm, Mar 23 2017]
[link]
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Baked and WKTE. Södertälje, Sweden. |
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[suggested-for-deletion] redundant, not a new idea. |
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[8th of 7], my Google is broken. Can you post a link? |
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(All of the references I've been able to find so far show the bridge
moving.) |
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Full marks to [Mr. Thenerd] |
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(Don't worry about [8th]. He only annotated because he has an umlaut fetish.) |
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// show the bridge moving // |
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That's probably the new "big" bridge at the North end of the channel. Before that, the channel "dived" under the old, fixed bridge. The whole thing was enlarged to let larger ships through. |
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Umm, if we were talking about bridges, with or without canals, with screw-jacks then that would be handy, seeing as the sea level is rising. |
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//with screw-jacks// and elastic rubber roads. |
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I was thinking more slidey big bits of steel covered in tarmac. |
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As the water level rises, they slide out to join the bridge to whatever bit of road is not underwater yet. |
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See Illustration A, linkey wotsit. |
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