An initial form slab and waterproofing mat have been installed at the south end of the Chinatown Station headhouse.
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An initial form slab and waterproofing mat have been installed at the south end of the Chinatown Station headhouse.
Inside the platform cavern just north of the entrance from the headhouse, workers have begun to install sheets of waterproofing against the exterior shotcrete shell.
Sheets of PVC waterproofing continue to be installed against the outer walls of the Union Square/Market Street's north concourse lower level, prior to installing rebar and shotcrete.
Vinyl sheeting is being installed as part of waterproofing, as seen here on the east wall of the Union Square/Market Street station box.
A welder assembles a hoist atop a waler inside the north concourse, while workers continue installing waterproofing and structural elements for internal walls below.
A team of workers inside the north concourse construct rebar cages which will become the finished interior walls.
Looking south from near the north headwall, the rebar cage of the west wall is going in, while waterproofing is being installed on the east side. Heavy duty scaffolding can also be seen to carry the weight of reinforced concrete waler forms along the west wall.
A welder cuts away unneeded portions of brackets on the east wall of the Union Square/Market Street station box, creating a waterfall of sparks being cooled off by an associate ready with a hose.
Workers along the east wall of the north concourse install a rubber gasket and vinyl sheeting as part of concourse waterproofing work, while the rebar cage of the fan level concourse floor slab comes together.
Crews are hard at work constructing the rebar cage for the invert slab of the north concourse's lower level, where it meets the edge of the station box under Stockton and Geary.
A crew installs rebar and concrete formwork along the east wall of the station box.
The invert or base slab of the north concourse has been poured under Stockton, just north of Geary.
Large concrete forms are being constructed for structural elements at the bottom of the angled exterior walls inside the Union Square/Market Street station box.
At the north end of the station box, a man flags a boom lift operator before the operator prepares to remove temporary bracing above.
Looking south from south of Geary, new equipment and materials are constantly being lowered into the station box, where work has now fully transitioned from excavation to building out the station interior.
Along the east wall of the station box, workers construct concrete forms around huge wall footings.
View looking southwest from the north headwall, concrete forms are being constructed around rebar cages extending out of the station box invert slab's outer edges.
A carpenter builds part of a concrete form in the northwest corner of the station headhouse, while others install rebar and temporary bracing elements nearby.
Teams of workers build rebar cages for vertical columns and exterior walls along the west wall of the Yerba Buena/Moscone station headhouse.
Two men on a scissor lift help to install vinyl sheets as part of waterproofing materials for the station box interior, along its west wall.