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

180 Chapter Six
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2. Use adjustable bases to compensate for uneven ground.
3. Ensure that all scaffolding is plumb and level at all times.
4. Do not force braces to fit. Adjust the level of a scaffold until
the proper fit can be made easily.
5. Anchor running scaffolding at appropriate intervals in accordance
with the manufacturer’s specifications.
6. Use horizontal diagonal braces to prevent the scaffolding
from racking.
7. Either guy or interconnect with braces to other towers, any
tower whose height exceeds three times the minimum base
dimension.
8. Set all caster brakes when a rolling tower is not in motion.
9. Do not overload the casters. When a tower is supporting a
load, extend the adjustable bases to take the full load.
10. Use the legs instead of the horizontal struts to support heavy
loads.
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Appendix B provides recommended safety requirements of the
Scaffolding, Shoring, and Forming Institute (SSFI). This organization
was formed by U.S. manufacturers for the purpose of setting guidelines
for the safe use of scaffolding equipment and other related
products.
Horizontal Shores
Adjustable horizontal steel shores, consisting of two members per
unit, are frequently used to support the forms for concrete slabs,
beams, and bridge decking. The members are designed to permit one
member to telescope inside the other, thereby providing stepless
adjustments in the lengths within the overall limits for a given shore.
Horizontal flanges or prongs projecting from the ends of the shores
rest on the supporting beams, stringers, or walls. They are available
for spans varying from about 5 to 20 ft.
Horizontal shores can be used as joists directly under the plywood
sheathing, which eliminates the requirement for lumber. The
units are manufactured with adjustable built-in camber setting
devices to compensate for deflection under loading.
Among the advantages of horizontal shores are the following:
1. They are relatively light in weight.
2. The adjustable lengths, which permit a wide range of uses,
reduce the need for excessive inventory.
3. The built-in camber permits adjustment for deflection under
loading.
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