The employer shall ensure of a construction site of a building or other construction work that appropriate measures are taken to prevent the foot of a derrick being lifted out of its socket or support.
69. Construction and maintenance of lifting gear The employer shall ensure at a construction site of a building or other construction work that,--
(a) every lifting gear is,-
(i) of good design and construction, sound material and adequate strength to perform the work for which it is used;
(ii) free from patent defects: and
(iii) properly maintained in good repair and working order.
(b) components of the loose gear, at the time of its use, are renewed if one of its dimensions at any point has decreased by ten per cent or more by user;
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(c) a chain is withdrawn from use when it is stretched and increased in length which exceeds five per cent of its length or when a link of such chain is deformed or is otherwise damaged or raised scarfs of defective welds is appeared on it;
(d) rings, hooks, swivels and end links attached to a chain are of the same material as that of such chain; and
(e) the voltage of electric supply to any magnetic lifting device does not fluctuate by more than plus ten per cent or minus ten per cent.
70. Test and periodical examination of lifting gears. The employer shall ensure at a construction site of a building or other construction work that,-
(a) a lifting gear is initially tested for the manufacturer by a competent person, in a manner specified in Schedule-1 to these rules before taking into use or after undergoing any substantive alterations which renders its any part liable to affect its safety and such gear altered shall subsequently be re-tested for the use of its owner at least once in every live years.
(b) a lifting gear in use is thoroughly examined once at least in every twelve months by a competent person.
(c) a chain in use is thoroughly examined once at least every month by a responsible person , for its use: and
(d) certificates of initial and periodical tests and examination of loose gears under these rules are obtained in Form VII under Schedule – XIII to these rules.
71. Ropes. The employer shall ensure at a construction site of a building or other construction work that,-
(a) no rope is used for building or other construction work unless,-
(i) it is of good quality and free from patent defects and
(ii) in the case of wire rope, it has been tested and examined by a competent person in the manner specified in Schedule-1 to these rules;
(b) every wire rope of lifting appliance or lifting gear used for building or other construction work is inspected by a responsible person for such use. once at least in every three months:
Provided that after any such wire is broken in such rope. it shall thereafter be inspected once at least in every month by the responsible person.
(c) no wire rope is used for building or other construction work if in any length of eight diameters of such wires, the total number of visible broken wires exceed ten per cent of the total number of wires in such rope, or such rope -34- shows sign of excessive wear, corrosion or other defects which in the opinion of the person who inspects it or Inspector, having jurisdiction, is unfit for use;
(d) eye splices and loops of ropes for the attachment of hooks, rings and other such parts to wire ropes are made with suitable thimble;
(e) a thimble or loop splice made in any wire rope sling conforms to the following standards, namely:-
(i) wire rope sling shall have at least three tucks with full strand of rope and two tucks with one-half of the wires cut out of each of such strand in all cases, such strands shall be tucked against the lay of the rope;
(ii) protruding ends of such strands in any splice of wire rope slings shall be covered or treated so as to leave no sharp points;
(iii) a fibre rope or a rope sling shall have at least four tucks tail of such tuck being whipped in a suitable manner; and
(iv) a synthetic fibre rope or rope sling shall have at least four tucks with full strand followed by further tuck with onehalf filaments cut out of each of such strand and final tuck with one-half of the remaining filaments cut-out from such strands. Any portion of the splices containing such tucks, with reduced number of filaments, shall be securely covered with suitable tape or other materials:
Provided that nothing contained in this sub-clause shall apply where any other form of splice, which may be shown to be as efficient as the splice with above standards, is used.
72. Heat treatment of lifting gears. The employer shall ensure at a construction site of a building or other construction work that,-
(a) all chains other than bridle chains attached to derricks and all rings, hooks, shackles and swivels used in hoisting or lowering of such derricks are effectively annealed under supervision of a competent person and at the following intervals, namely:-
(i) such chains, rings, hooks, shackles and swivels which are not more than twelve and a half millimetre of length are so annealed at least once in every six months: and
(ii) all other such chains, rings, hooks, shackles and swivels are so annealed at least once in every twelve months:
Provided that such annealing as referred to in sub-clause (i) and sub-clause (ii) shall not be required if the Inspector, having jurisdiction after, obtaining the approval of the Chief Inspector of Inspection of Building and Construction directs that such chains, rings, hooks, shackles and swivels undergo some other treatment and in such cases the treatment directed by such Inspector shall be followed:
Provided further that in case of such chains, rings, hooks, shackles and swivels used solely on such derricks and other hoisting appliance which are worked by hand, the provisions of sub-clause (i) and sub clause (ii) as the case may be shall apply as if for the -35- period of six months and twelve months the periods of twelve months and two years have respectively been substituted therein:
Provided also that in case where the Inspector, having jurisdiction, is of the opinion that owing to the size, design, material or frequency of use of any such chains, rings, hooks, shackles and swivels, the requirement of this clause for annealing is not necessary for the protection of building worker, he may after obtaining the approval of the Chief Inspector of Inspection of Building and Construction, certify in writing to such employer that subject to the conditions specified in such certification, such chains, rings, hooks, shackles and swivels are exempted from such annealing and thereafter the provision of this clause shall apply subject to such exemption:
Provided also that this clause shall not apply to,-
(i) pitched chains, working on sprocket or sprocketed wheels;
(ii) rings, hooks and swivels permanently attached to pitched chains, pulley blocks or weighing machines; and
(iii) hooks and swivels having ball bearings or other case hardened parts;
(b) a chain or a loose gear made of high tensile steel or alloy steel is plainly marked with a mark indicating that it is so made:
(c) no chain or loose gear made of high tensile steel or alloy steel is subjected to any form of heat treatment except where such treatment is necessary for the purpose of repair of such chain or loose gear and that such repair is made under the direction of the competent person;
(d) that the wrought iron gear, the past history of which is not traceable, is suspected of being heat treated at incorrect temperature, is normalised before using it on any building or other construction work.