...ead envision a ring of underater bumpers to ithstand ship collisions. Build in the open ocean.hen determining the exact site of the bridge, designers had to choose beteen a shallo area that spanned 20 miles, hich ould have meant many piers in a busy shipping zone, and a narro portion thats 2,700 feet deep.But the Gibraltar Bridge designers lucked out. A closer inspection of the narro portion revealed an underater mountain in the center that could hold the center piers, dividing the bridge into to spans of 4 12 miles each. Gibraltar Bridge if stretched over NYC Span 9 MilesThe longer the span, the heavier the bridge. At the length required to span the Strait of Gibraltar, a suspension bridge that supports the eight of the roaday ith cables spanning from toer to toer ould sag and ultimately collapse. A cable-stay bridge that attaches cables directly to the roaday, ould require unorkably high toers to support the length of the roaday. Gibraltar Bridges designers say hy not use both techniques The Gibraltar Bridge design supports 3 miles of each 4 12 mile span ith suspension cables, and the remaining 1 12 miles ith a cable-stay technique attaching cables to diagonal struts on either side of each toer. Keep the traffic floing and safelyFive lanes of traffic in either direction ill flo over a roadbed made of spun glass. Traffic on Gibraltar BridgeThe Gibraltar Bridges traffic ill flo over a roadbed made of spun glass. Designers say five lanes in either direction should be enough to handle the volume of vehicles.Fiberglass materials of this sort are rated at five times stronger than concrete, and any cracks or other damage could be isolated due to its eb-like internal structureEngineers say fiberglass bridge materials can last up to 100 years. Theyre also easier to install. A concrete roaday on Gibraltar Bridge ould take 3 months to pour as opposed to a fe days or eeks ith fiberglass..9LMNo-3tbczOH !hiyqq5OJaQJaaj4fBCJ UaJ mHphsHOJaQJa5OJaQJamHsH!BCJOJaQJaaJmHphsH5BOJaQJat
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