Page 67 - Safety and health in construction
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10. Cofferdams and caissons and work in compressed air
10.1. General provisions
10.1.1. Every cofferdam and caisson should be:
(a) of good construction and suitable and sound material and of adequate strength;
(b) provided with adequate means for workers to reach safety in the event of an inrush
of water or material;
(c) provided with safe means of access to every place where workers are employed.
10.1.2. The construction, positioning, modification or dismantling of a cofferdam
or caisson should take place only under the immediate supervision of a competent
person.
10.1.3. Every cofferdam and caisson should be inspected by a competent person
at intervals prescribed by national laws or regulations.
10.1.4. A person should only be allowed to work in a cofferdam or caisson if it
has been inspected and found safe by a competent person within such preceding period
as is prescribed by national laws or regulations and the results thereof recorded in a
prescribed form or register.
10.1.5. Work in compressed air should be carried out only in accordance with
measures prescribed by national laws or regulations.
10.1.6. Work in compressed air should be carried out only by workers who are 18
years old or more and who have been medically examined and found fit for such
employment.
10.1.7. Work in compressed air should be carried out only when a competent
person is present to supervise the conduct of operations.
10.1.8. National laws or regulations should lay down conditions in which the
work is to be carried out and the plant and equipment are to be used and provide for
health surveillance of workers and the duration of work in compressed air.
10.1.9. No person should be employed in compressed air unless he is under the
constant supervision of an experienced person and properly instructed and supplied
with a leaflet containing advice as to the precautions to be taken in connection with
such work.
10.1.10. No person should be subjected to a pressure exceeding 2.5 bar except in
emergencies.
10.1.11. For every shift a record should be kept showing the time every worker
spends in the working chamber and the time taken for decompression.
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