Shoring is typically installed from the top down. A typical
sequence would include installation of vertical structural
members from the existing ground surface followed by the installation
of anchors as excavation proceeds downwards.
Vertical structural members could include
drilled in soldier piles, sheet piles installed by vibration,
or soilcrete columns or panels installed by drilling and grouting.
The vertical structural members resist lateral pressures and
prevent soil raveling. Anchors, consisting of steel tendons
or high strength deformed bar, are also used to resist lateral
pressures.
Soil nail walls and reaction block
anchor walls are atypical in that they are installed as excavation
proceeds downwards without the initial installation of vertical
structural members. These shoring systems typically use shotcrete
to control the raveling of the excavation face during the
performance of the work, or precast blocks.
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