The work has been repeatedly delayed, most recently because workers had trouble taking apart a rusty steel-and-concrete counterweight, weighing four million pounds, that allowed the 188-foot movable span to swing up like a drawbridge over a moat.
36 post-tensioned straddle bents span 60-ft under the elevated span to form a pocket for the movable span to rest while the bridge is open.
Retraction of the movable span is accomplished by two hydraulic winches located on the control pier on the southeast side of the bridge.
Mr. Ettore said that the bridge was originally a fixed span, not a movable bridge, and that nearly every bolt and beam of the bridge had been replaced since it was built.
Tower Bridge, movable bridge of the double-leaf bascule (drawbridge) type that spans the River Thames between the Greater London boroughs of Tower Hamlets and Southwark.
Or we might build two spans: a low bridge from Brooklyn to Governors Island and then a second, movable bridge — there are many options, from a typical drawbridge to an elegant tilt bridge — onto Manhattan.
Its broad 175-page saysy says the state should consider storm barriers with movable gates that would span the Narrows, at a cost of tens of billions of dollars, and endorses a variety of "soft infrastructure" investments like building dunes and wetlands and oyster reefs, which were more prevalent along New York's coastline in the 1800s.
This article presents a study of an alternative casting process for concrete bridge decks executed span-by-span through self-supporting launching falsework or Movable Scaffolding System, focusing on a reduction of the critical path of construction.
The bridge was designed with a movable floating pontoon.
In this paper the non-linear closed-form static computational model of the pre-stressed suspended biconvex and biconcave cable trusses with unmovable, movable, or elastic yielding supports subjected to vertical distributed load applied over the entire span and over a part (over the half) of the span is presented.
