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May 9, 2019

Crews snip connection to Seneca Street, fill Battery St. Tunnel with viaduct rubble

Photo by Benjamin Minnick [enlarge]
Crews recently cut the Seneca Street off-ramp connection to the viaduct.

Photo from WSDOT [enlarge]
Side-dumping trucks are depositing viaduct debris in the Battery Street Tunnel.

Demolition crews have been putting on a show along the Seattle waterfront, as they chew away at the Alaskan Way Viaduct while tourists and office workers capture the moment on their phones.

One crew recently severed the viaduct's connection to Seneca Street as it continues to move north on the viaduct. Kiewit and subcontractor Ferma are using excavators equipped with demolition shears to remove the viaduct in this location. They will return later to finish removing the Seneca off-ramp.

Another crew working north of Pike Place Market is cutting the viaduct into pieces and using cranes to lift them away. This operation is different due to the steep slope and proximity to the BNSF Railway tracks.

Another show, one that the tourists can't see, is going on underground inside the Battery Street Tunnel. Here, Kiewit is filling the tunnel with viaduct debris as part of the tunnel's decommissioning. Crews are depositing the baseball-sized chunks from side-dumping trucks. They also are installing sewer lines and conducting other utility work inside the tunnel.

Kiewit this week was expected to start filling the tunnel from the top, using funnels on Battery Street. Workers will compact the fill using a vibratory roller. This job will last at least three months as crews fill up to about 7 feet from the top of the tunnel. Later, low-density cellular concrete will be pumped in from above to seal up the rest of the tunnel.

Other crews are rebuilding Seventh Avenue (formerly Aurora Avenue North) between Denny Way and Harrison Street.




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