Over all, most of what is visible is continuing progress on utility relocation.
The contractor has begun prepping for excavation of the area where the west end of the bored tunnels transition to cut and cover in the VA-7 Leesburg Pike VA-123 Chain Bridge Road interchange. The contractor has also drilled wells along the bored tunnel alignment. One can assume these wells will be used to monitor changes in the water table as tunneling proceeds.
I am starting to believe that the bored tunnels will not be excavated using a TBM (Tunnel Boring Machine) but will be excavated using the NATM (New Austrian Tunnelling Method).Grading has begun in the area of the Wiehle Avenue Station.
The contractor has forms in place for one of the columns that will carry outbound track N2 over westbound lanes of VA I-66.
The location of the future Dulles Yard is being used for tools and equipment storage.
Originally published 08 03 2009N Route Silver line flyover east of West Falls Church Station:
VA-123 Dolly Madison Boulevard:
|Tyson Central 123 (Tysons Corner) station.||Tyson Central 123 (Tysons Corner) station.||Tyson Central 123 (Tysons Corner) station.|
|North side Tyson Central 123 (Tysons Center) station.|
Cut and cover tunnel trenches in VA-7 Leesburg Pike VA-123 Dolly Madison Boulevard interchange:
Wiehle Avenue station:
|Grading Wiehle Avenue Station.||Grading Wiehle Avenue Station.||Grading Wiehle Avenue Station.|
Washington Dulles International Airport:
|Autopilot Drive, Dulles Airport, Future elevated with east side of road.||Project staging area, future location of Dulles Yard.|
Pictures at picasaweb.google.com/cambronj 08-02-2009