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| Re: New details on East Side Access construction; photos (425264) | |||
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Re: New details on East Side Access construction; photos |
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Posted by JRice on Fri May 4 08:23:56 2007, in response to Re: New details on East Side Access construction; photos, posted by Sand Box John on Thu May 3 09:10:47 2007. On very hard rock the cutter wheels of a TBM are pressed against the rock and turned chipping the rock in a manner similar to pressure flaking as neolithic man did to create arrow heads. This results in random size pieces popping off and a lot of dust ground off the face. Depending on site conditions, access restraints, contractor preference, etc. a rock crusher may be the first or last step in the muck haul (either by the narrow gauge trains or conveyor.Still makes excellent drainage material for fill and therfore excellent for highway jobs and fill on track areas below the ballast and subballast. |
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