Rehabilitation of a Failing Anchored Retaining Wall - Nicholson ...

Richards/Thome, Page 7
Figure 1 Rehabilitation Typical Design Section
Soldier piles were placed in 0.9 meter predrilled holes. To reduce risk of any slurry wall
movement some shafts were skipped and then drilled on another shift. Slurry wall panels
were monitored with a total station approximately every ten minutes during drilled shaft
installation by shooting prisms mounted to the slurry wall. Readings continued on the wall
every half an hour until the soldier piles were placed in the drilled shafts and filled with
structural concrete.
Due to the precast lagging and especially the precast wales, accurate soldier beam placement
was required. 10 meter long templates were made that would support the beams in the drilled
shafts prior to the initial set of the structural concrete.
Prior to setting the concrete waler, existing anchor locations on the slurry wall were compared
to proposed anchors through the new wall. If any of the new anchors were expected to hit an
existing anchor bearing plate, the waler would be slid to one side if clearance of the bearing
plate could be accomplished. As a last resort a portion of the bearing plate would be burned