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.
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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.
A bulldozer returns to load up excavated material from inside the station cavern, before bringing it a collection area in the headhouse.
The twin subway tunnels can easily be seen extening beyond the north wall of the Chinatown Station platform cavern, as well as the opening for the north emergency egress shaft.
Looking toward the north end of the Chinatown Station platform cavern, the twin subway tunnels and north emergency egress shaft are clearly visible during the final stages of excavation there.
An excavator fitted with a shotcrete spraying machine works its way closer to the extreme north end of the Chinatown Station platform cavern's center drift invert, where excavation work is wrapping up.
Pieces of the temporary shotcrete separator walls removed from the north station platform cavern are broken down near the Chinatown station headhouse portal.
The last portions of the north platform cavern's invert area are currently being excavated, prior to removal of the shocrete side drift separator walls.
Chunks of demolished shotcrete removed from the northern portion of the Chinatown platform cavern wait to be broken down further where the platform cavern meets the cross-cut cavern entrance from the station headhouse.
The north portion of the station platform cavern has broken through into the north egress shaft, excavated previously.
Pieces of rebar are cut to length inside the top heading of the north platform cavern as part of wall and ceiling reinforcing, as a surveyor checks measurements for potential ground movement.
Crews excavating the top heading of the north platform cavern have hit the reinforced shotcrete shell of the north egress shaft, which will eventually be opened to construct an emergency exit stairwell.
As excavation work in the north platform cavern has progressed toward the north egress shaft, sections of large-diameter ventilation which were formerly used to bring fresh air into the cavern side drifts are no longer needed and removed.
A bulldozer and two excavators are among many pieces of equipment utilized during excavation of the northern portion of the Chinatown station platform cavern.
The arm of an excavator fitted with a rock grinder works away at the invert of the Chinatown Station north platform cavern's center drift.
A flagger signals at the entrance to the station cavern with a high-powered LED light around a blind corner, so workers will know to wait until large excavation equipment passes by.
A worker and surveyor take readings inside the top heading of the north platform cavern's center drift, where excavation is underway.
A heavy-duty excavator waits near the invert excavation ramp for the north platform cavern of Chinatown Station.
Looking north from just south of the Washington and Stockton intersection, workers observe operations during excavation of both the north and south platform caverns.
Looking north, workers come and go from the two top headings currently being excavated for both the north and south platform caverns.
A shotcrete-spraying machine is started up inside the top heading of the north platform cavern. Shotcrete will be sprayed against steel mesh for reinforcing, creating an initial structural barrier against the pressure of soil above.