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Detailed design of temporary column supports
and shoring in connection with a project
to increase headroom clearance in the
basement of an existing shopping mall.
The project involved the design of an
extensive jacking and shoring system to
support the existing cast-in-place concrete
structure temporarily while excavations
were made below. Controlled pressure hydraulic
flat jacks were used to transfer the existing
loads to a purpose-made steel truss. When
the new foundation elements were complete
(in checkerboard fashion), the jacking
process was reversed and loads were transferred
on to the new structural elements.
Net movements of the existing structure
were limited to less than 1/16 on an inch.
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