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| Re: 2 photos of the Park St (Ave) el in Brooklyn (1442801) | |||
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Re: 2 photos of the Park St (Ave) el in Brooklyn |
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Posted by Stephen Bauman on Wed Jul 12 07:26:24 2017, in response to Re: 2 photos of the Park St (Ave) el in Brooklyn, posted by JOE @ NYCMTS - NYCTMG on Wed Jul 12 07:01:53 2017. BTW -- The bridge engineers / contractors carefully removed, unbolted it completely in sections at a time, the outermost inside truss steel open web wall (the one between each single EL track and side-adjacent trolley track lane) and re-installed these removed trusses, removed in sectional increments, on top of the lower outer 8' high truss along the outer roadways of the Bridge. These inner trusses were carefully UNBOLTED from the bridge main structures where they were installed back in 1880-1883 and are now the actual re-purposed outer high truss girders along the outer roadway lanes since 1953-54 !!. THAT laborious process is what took so (3 years) long, including installing the countless rows of new long cross beams across the now 3 E/B and 3 W/B roadways to form a wide open rectangular box structure over the each !The Bridge is balanced between the two side spans (from tower to anchorage) and the center span. It was necessary to maintain that balance throughout the conversion. Those "cross beams across the now 3 [lane roadways]" are actually struts. They do not support any weight. Their purpose is to prevent the outer and inner trusses from bending towards one another at the top under load. The current bridge architecture with two trusses on each roadway and struts on the top, was one that Washington Roebling objected to on aesthetic grounds. |
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