Quote:
Originally Posted by OhioGuy
I thought it had been talked about before here on SSP about the possibility of constructing the line under 10th Ave? (or was it 8th Ave?) That way the cheaper cut & cover approach could be used without severly disrupting the businesses on Broadway? Is that being considered?
|
After the Cambie Big Dig surprise, City Council passed a resolution that the rapid transit project along Broadway corridor would NOT be cut & cover.
With the rejection of elevated on Broadway as well, Council has essentially mandated that it will be built using TBM tunneling equipment - similar to what was used to build the Canada Line from 2nd Ave, north under False Creek, west under Davie St, curve to north under Granville to Hastings.
The 'cut and cover' that was done downtown was the only way the Vancouver Centre Station could be built - dig up the block of Granville between Georgia and Robson to get to the tunnels made by the TBM.
Photo credit to "Tafyrn & Seamora" at canadalinephotos.blogspot.com
(thanks too for not being afraid of heights)
Digging out the Vancouver Centre Station to reveal the first finished TBM tube (outbound to YVR / Richmond)
Chipping out the rings that make up the TBM tube (outbound to YVR / Richmond)
With the tunnel rings removed, level out the bottom of the station, and start building it's foundations
Although this block of Granville was a construction mess, the rest of Granville south of Robson was 'business as usual' even while the TBM was working under the street. The local businesses were hurting because the normal bus traffic was moved over to Howe or Seymour during construction, but this was because of the need to use the full width of Granville to dig out the pit for building the stations; the rest of Granville Street and Davie Street were not dug up to build the tunnels -as was done using 'Cut and Cover' for the full length of Cambie from 2nd Ave to 74th Ave.
Using a TBM under 10th Ave could be done the same way. ie: at City Hall, only the block of 10th Ave between Cambie and Yukon would have to be dug up to get down to the subway tubes and build the new station. The nearby blocks east of Yukon & west of Cambie may be inconvenienced with the station construction and the detour around this one block, but those nearby streets are still usable for bikes, pedestrians and vehicles.
Using 10th Ave as the route also means minimal inconvenience on Broadway itself during construction.