Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

170 Chapter Six
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The Symons timber brace nailer plate allows rapid attachment of
bracing when required by the U.S. Occupational Safety and Health
Administration. These single-post shores are fully compatible with
Symons heavy-duty shoring.
Site Preparation for Shoring
The proposed shoring area should be cleared of all obstructions
before erection of shores. Special care should be given to determining
the capacity of the soil for every shoring job, to ensure adequate
bearing support for shores. Weather conditions can arise that can
create a poor ground condition, which may cause a hazardous situation.
If fill is required in shored areas, a qualified engineer should
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be consulted to determine remedial measures that should be taken
to ensure safety. A solid concrete foundation pad on grade or a mud
sill should be installed to distribute the shoring load over a suitable
ground area.
Selecting the Size and Spacing of Shores
This example illustrates a method of determining the spacing of shores.
Consider a concrete slab 5 in. thick, supported by concrete beams
spaced at 20 ft center to center, as illustrated in Figure 6-4. The beam
FIGURE 6-4 Formwork for slab and beam.
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