Quote:
Originally Posted by officedweller
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Thanks for posting OfficeDweller.
A few highlights:
"When it opens, the U-Link section of Seattle’s Light Rail Transit (LRT) program will increase Iinital Segment/Airport ridership by an estimated
70,000 travelers a day."
Source [page1]
"The University Link project extends Seattle’s light rail from downtown to University of Washington (UW). It includes 5.0 kilometers (3.15 miles) of twin-bored,
6.4 meters (21 feet) excavated diameter tunnels, and two cut-and-cover stations.
The
Capitol Hill Station (CHS) requires an excavation
170.7 meters (560 feet) long, 22.6 meters (74 feet) wide, and 22.9 meters (75 feet) deep.
The
University of Washington Station (UWS) requires an excavation of about
238.4 meters (782 feet) long, 21.3 meters (70 feet) wide, and 33.5 meters (110 feet) deep."
Source [page1]
"At I-5 the tunnels will be passing under the roadway with 4.6 meters (15 feet) of cover. In order to cross at this grade, portions of the existing cylinder pile walls adjacent to I-5 will need to be removed. These existing walls will be incorporated into four pits that will be excavated prior to the tunnels passing under I-5 and will act as lateral supports."
Source [page2]
The Canada Line never had to contend with the footings of the largest highway on the West Coast. The huge budget for the project is beginning to make more sense.
"One of the challenges of the UWS design is the hydrostatic uplift force acting on the invert slab due to the high water level. Typically, where hydrostatic forces exceed dead loads, stability can be created by adding dead load, reducing hydrostatic forces, or anchoring down the structure. Adding dead load would be a very costly solution because of the massive oversizing of the invert slab required to create enough weight."
Source [page4]
"Husky football and the University Medical Center are two very important entities for the UW. So much so that the University’s agreement with Sound Transit requires that throughout the 60-month construction duration, Medical Center access to the portions of the parking lots not impacted by construction must be maintained and Husky Stadium must remain accessible on football Game Days and four other events during the year. To meet this goal, the design includes a two-contract and three-staged site plan, which includes 2.4 hectare (6 acres) of work area for the initial 36 months, 1.6 hectares (4 acres) of work area for the months 37–57 and 0.8 hectare (2 acres) of work area for the balance of the contract."
Source [page4]
I'm sure the general contractor
loves that they will have to move their construction staging sites
three times during construction, and each time to a site half the size of the last.
Look at how tight the tunnel cross section is:
Source [page5]