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| Re: New details on East Side Access construction; photos (425297) | |||
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Re: New details on East Side Access construction; photos |
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Posted by Sand Box John on Fri May 4 09:30:19 2007, in response to Re: New details on East Side Access construction; photos, posted by JRice on Fri May 4 08:23:56 2007. The 21' diameter boring machine that was used on the A route Red line had no crusher on it. It ground the rock from the tunnel face in the exact fashion you described. The spoil was conveyed from the cutting head to a narrow gauge muck train and was dumped from the cars at a rotary dump in Rock Creek Park. A front loader was used to load the muck in dump trucks for removal from the site. Out on the Maryland end (Bethesda to the north portal) the muck was lifted out at various vent shafts and the north portal for loading in to dump trucks for removal.The same boring machine was used for both tunnels from Rock Creek Park to Pooks Hill Road. The lease on the boring machine was transferred from one contractor to the next as the tunnels progressed north to Pooks Hill Road. John in the sand box of Maryland's eastern shore. |
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