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span drive [1 record]

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Record 1 2001-01-08

English

Subject field(s)
  • Tunnels, Overpasses and Bridges
CONT

The vertical-lift bridge has a span similar to that of a fixed bridge, and is lifted by steel ropes running over large sheaves at the tops of its towers to the counterweights, which fall as the lift span rises and rise as it falls. If the bridge is operated by machinery on each tower, it is known as a tower drive. If it is driven by machinery located on the lift span, it is known as a span drive.

CONT

210' 9" J.A.L. Waddell span drive vertical lift bridge.

French

Domaine(s)
  • Tunnels, viaducs et ponts

Spanish

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