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| Re: Second Ave Alignment Change (639810) | |||
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Re: Second Ave Alignment Change |
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Posted by Sand Box John on Wed Jun 25 22:38:53 2008, in response to Re: Second Ave Alignment Change, posted by JournalSquare-K-Car on Wed Jun 25 20:12:35 2008. I think if they use good steel to make a good El with well designed rail brackets, it should be quiet enough.There are two things that make an elevated quite. Acoustical deflecting parapets and direct fixation rail fasteners. Both have been around for years. The method of construction makes no difference (poured in place concrete deck on steel beams, poured in place concrete deck on steel box beams, poured in place concrete deck on post tension concrete beams, segmented post tension concrete bridge spans, monolithic poured in place bridge spans) as long as direct fixation rail fasteners and acoustical deflecting parapets are present. John in the sand box of Maryland's eastern shore. |
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