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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