Jet Grouting on Pine Street

Late next year, the first Tunnel Boring Machine (TBM) will arrive at Pine Street from Capitol Hill. When it arrives the machine will be disassembled and trucked back to Capitol Hill to dig the second tunnel. Sound Transit’s contractor is about to begin the preparations for the arrival of the machine. One of the first major activities is jet grouting – a ground improvement technique that utilizes a strong, cementitious material to stabilize the ground and prepare the area for the launch and extraction of the tunnel boring machine.

Beginning in early August 2010, and lasting for approximately 2 months, Sound Transit’s contractor, JCM U-Link Joint Venture, will be conducting jet grouting activities in the Pine Street area east of the Paramount Theatre. Work will take place in a fenced-off lot adjacent to the Paramount Theatre as well as in the eastbound lane and south sidewalk of Pine Street between 9th and Boren avenues.

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