Project - SR 99 - Tunnel Project. Drivers on SR 99 in Seattle will soon see a noise-blocking wall rise out of the ground near the spot where crews will dig a pit to reach and repair Bertha, the SR 99 tunneling machine. The double-plywood wall, which will be as tall as the lower deck of the Alaskan Way Viaduct, is designed to shield neighbors from construction noise associated with the repairs. It will stretch along the west side of the viaduct between South Jackson and South Main streets.
Construction of the wall should take about two weeks. Our contractor for the tunnel project, Seattle Tunnel Partners (STP), is still finalizing their repair plan for the machine. What we know so far is that crews will dig a 120-foot-deep pit in front of the machine, which is located about 60 feet below the surface between Jackson and Main. The machine will then tunnel forward into the pit so crews can partially disassemble it and make repairs to the seal system and main bearing.
These conceptual drawings illustrate the basic idea. Project - SR 99 - S. Holgate Street to S. King Street Viaduct Replacement. Drivers on SR 99 in Seattle will soon see a noise-blocking wall rise out of the ground near the spot where crews will dig a pit to reach and repair Bertha, the SR 99 tunneling machine. The double-plywood wall, which will be as tall as the lower deck of the Alaskan Way Viaduct, is designed to shield neighbors from construction noise associated with the repairs.
It will stretch along the west side of the viaduct between South Jackson and South Main streets. Construction of the wall should take about two weeks. Our contractor for the tunnel project, Seattle Tunnel Partners (STP), is still finalizing their repair plan for the machine. What we know so far is that crews will dig a 120-foot-deep pit in front of the machine, which is located about 60 feet below the surface between Jackson and Main.
Because this is a design-build contract, STP is responsible for developing and implementing the plan to fix the machine and resume tunneling. Previous updates. Project - SR 99 - Alaskan Way Viaduct Replacement. SR 99 Tunnel Project - Safety features. Street Smarts - roads and traffic blog | HeraldNet.com - Everett and Snohomish County, Washington.