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Haarlem old lifting bridge.
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Lifting bridges are moveable bridges which enable
boats to pass. They vary from simple wooden designs such as
many seen in the Netherlands to large steel structures which
carry heavy roads such as the bascule bridge in Docklands.
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They
rely on the principle of levers and equilibrium.
A large counterweight balances the weight of the bridge deck
to enable the bridge to pivot upwards with a minimum of effort.
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Edam
lifting bridge frame.
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Lifting
bridge pivot. |
A simple
pivot on a wooden lifting bridge. |
Edam
lifting bridge. |
This
lifting bridge in Edam in the Netherlands is so well balanced
that a single person can lift the bridge by pulling on a chain.
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Edam
lifting bridge,
road view.
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Edam
lifting bridge. |
Skinnybridge,
Amsterdam.
A double lifting bridge.
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Skinnybridge,
road view. |
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Large
’bascule’ bridge in London Dockland. This is lifted
by large electric motors moving the rack and pinion.
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Docklands
bascule bridge.
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Herengracht
bridge, Netherlands |
Docklands
Glengall bridge. |
Lifting
bridge frame,
Netherlands. |
Wood
frame lifting bridge,
Netherlands.
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