| 1521 Second Avenue - Opus Northwest
Malcolm Drilling was approached to perform this shoring
out project in the Spring of 2003. In the summer of
2006 the job was underway. The existing site conditions
left little to be desired. Within the top 15' of soil
lie the demolition debris left behind from the old Liberty
Theatre. To the north and south of the project were
older buildings, one being 3 stories with one level
of underground parking, the other being 7 stories with
varying footing types at multiple elevations. Both structures
required underpinning and the alley to the west of the
site was loaded with utilities as much as 16' below
road elevation. With this said, the site demanded a
very carefully thought out shoring plan and with the
help of it's designer MDCI delivered. 30 underpinning
piles 65' in length were utilized to hold up the existing
buildings, all of which were drilled and installed using
a water head to maintain hole stability. Underpinning
was also used in the alley to support various vaults
which were flush with the shoring limits. In addition,
strong backs were installed beyond the alley to help
reduce the huge cantilever loads. In all, the MDCI design
build system performed as expected with little movement
of the buildings or City right of way.
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