On Wednesday, Sound Transit gave a brief media tour of the active construction site where the future Capitol Hill Link station will be. So far, construction crews have excavated roughly 90,000 cubic yards of dirt, creating an enormous hole or “station box” which requires a conveyor belt for the removal of all the fill. According to Rick Capka, ST construction manager, roughly 10,000 more cubic yards, or ten feet in depth, have to be excavated before crews will put in a ten-foot thick concrete invert slab at the bottom of the box. The box will eventually be 80 feet deep, 80 feet wide, and 540 feet long.
The concrete slab will help the transition into the next phase of construction in mid-2011 when a TBM (tunnel-boring machine) will begin boring its way south to the Pine Street Stub Tunnel, roughly 3,800 feet. Two more TBMs will also be tunneling toward Capitol Hill simultaneously from the University Station site. According to Capka, crews haven’t encountered any significant delays apart from a few recent weather-related issues.
Thanks to Oran, we have a video of the tour above for your viewing pleasure. You can also view pictures in our Flickr pool.