Other building operations

Pages:250-269
29. Other building operations
29.1. Erection of prefabricated parts
General provisions
29.1.1. As far as practicable the safety of prefabricated parts
should be ensured by appropriate means, such as provision and
use of:
ladders;
gangways;
fixed platforms;
platforms, buckets, boatswain's chairs, etc. suspended from
lifting appliances;
safety belts and lifelines; and
catch nets or catch platforms.
29.1.2. Prefabricated parts should be so designed and made
that they can be safely transported and erected.
29.1.3. In addition to the conditions of stability of the part
when erected, when necessary to prevent danger the design should
explicitly take into account:
the conditions and methods of attachment in the operations
of stripping, transport, storing and temporary support during
erection; and
methods for the provision of safeguards such as railings and
working platforms, and, when necessary, for mounting them
easily on prefabricated parts.
29.1.4. The hooks and other devices incorporated in prefa-
bricated parts that are required for lifting and transporting them
should be so shaped, dimensioned and positioned as:
to withstand with a sufficient margin the stresses to which
they are subjected; and
not to set up in the part stresses that could cause failures,
or stresses in the building not provided for in the plans.
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Other building operations
29.1.5. Prefabricated parts made of concrete should not be
stripped before the concrete has set and hardened sufficiently to
ensure the safety of the operation.
29.1.6. Storeplaces should be so constructed that:
there is no risk of prefabricated parts falling or overturning; and
storage conditions generally ensure stability having regard
to the method of storage and atmospheric conditions.
29.1.7. Prefabricated parts made of concrete should not be
erected before the concrete has set and hardened to the extent
provided for in the plans.
29.1.8. While they are being stored, transported, raised or
set down, prefabricated parts should not be subjected to stresses
prejudicial to their stability.
29.1.9. Every lifting appliance should:
be suitable for the operations; and
be approved by a competent person, or tested under a proof
load 20 per cent heavier than the heaviest prefabricated part.
29.1.10. Lifting hooks should be of the self-closing type or of
a safety type.
29.1.11. Lifting hooks should have the maximum permissible
load marked on them.
29.1.12. Tongs, clamps and other appliances for lifting pre-
fabricated parts should:
be of such shape and dimensions as to ensure a secure grip
without damaging the part; and
be marked with the maximum permissible load in the most
unfavourable lifting conditions.
29.1.13. Prefabricated parts should be lifted by methods or
appliances that prevent them from spinning accidentally.
29.1.14. While prefabricated parts are being lifted measures
should be taken to prevent workers from being struck by objects
falling from a height.
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