Code of Practice for Safe Use and Operation of Suspended Working ...

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5.2.2 Working platforms should be capable of withstanding a distributed loadof one of the following declared ratings:(a) light duty working platforms : 1.5 kN/m 2 ;(b) medium duty working platforms : 2.0 kN/m 2 ;(c) heavy duty working platforms : 2.5 kN/m 2 ; or(d)three persons with hand tools and materials each weighing a total of115 kg, and all congregated at any point on the working platform togive the worst combination of loads.5.2.3 The suspended working platform in its operating position should bedesigned to withstand the sustained wind speed up to 14 metres persecond and gust up to 31 metres per second.5.3 Anchorage and Support5.3.1 A suspended working platform should be adequately and securelysupported, and the arrangement for its fixing and anchoring should beadequate to secure its safety. Furthermore, every structure supporting orfor anchoring a suspended working platform should be of goodconstruction and free from patent defect (regulation 5(1) of the SWPR).5.3.2 The details of anchorage and support of a suspended working platformthat may affect the structural integrity of the building should be submittedto the Building Authority or relevant authority for approval. The maximumtotal suspended load and the maximum rope tension of a permanentsuspended working platform should be calculated and the detailssubmitted to the architect or professional engineer in charge of the buildingor structure for approval. The building or structure should be strong enoughto resist these loads without sustaining damage or permanent deformation.5.3.3 Any holding-down bolts joining the roof rig or the track to the buildingshould be of an appropriate grade of austennitic stainless steel, and shouldbe designed in accordance with the Code of Practice of the StructuralUse of Steel 1987. The design criteria, appointment of registered generalbuilding contractor, installation requirements and supervision arrangementcorresponding to the relevant approving authority should be strictlycomplied with.19
5.3.4 Where bolts are used for anchoring rails to the roof, they should have aminimum diameter of 16 mm. These bolts may, for additional security, belocked beneath some of the reinforcement of the roof slab. Whereappropriate all nuts securing fixings should be kept in place by lockingdevice. Nuts should be tightened to, but not beyond, the torquerecommended by the manufacturer.5.3.5 Any metal components used to interconnect between the trolley rails,ancillary equipment and the roof should be of steel suitably protectedagainst corrosion, including electrolytic reaction.5.3.6 The deflections of the rail under load should not exceed 1/250 of thespan between the rail supports. The rails should be capable of safelywithstanding the forces resulting from the maximum total suspended load,the weights of the various parts of the roof rig, the self-weight of the rails,any counterweights or beams attached thereto, the longitudinal surgesresulting from traversing the roof rig and from the wind effects.5.3.7 Roof fixing5.3.7.1 When roof fixings of a permanent suspended working platform are reliedon to ensure stability, the factor of safety against overturning should beat least 3. The roof and fixings should then be designed according to thedesign stresses appropriate to the materials. The design and constructionof the roof fixing should be approved by a professional engineer.5.3.7.2 When roof fixings of a temporary suspended working platform are reliedupon as the sole means of achieving stability, they should be capable ofproviding a factor of safety of at least 3 against uplift. Where a roof isinsufficiently strong to provide this factor of safety, counterweights shouldbe added to provide an overall factor of safety against overturning of atleast 3. The roof fixing should be approved by a professional engineer.20
Page 1 and 2: Code of Practice forSafe Use and Op
Page 3: This Code of Practice is prepared b
Page 9 and 10: Competent personA competent person,
Page 11 and 12: Registered professional engineerA r
Page 13 and 14: 3. DESCRIPTION3.1 This Code specifi
Page 15 and 16: 4. MANAGEMENT OF SAFE OPERATION OFT
Page 17 and 18: (e)(f)(g)(h)(i)(j)(k)the suspended
Page 19 and 20: 4.2.3 Responsibility of working per
Page 24 and 25: 5.3.7.3 In the case of davit arm co
Page 26 and 27: 5.3.7.5 Where parapet wall clamps a
Page 29 and 30: 5.4 Stability Against Overturning5.
Page 31 and 32: 5.5 Counterweight5.5.1 Where counte
Page 33 and 34: 5.6.8 Adequate arrangements (e.g. t
Page 35 and 36: 5.8.3 If the rope is to be wound on
Page 37 and 38: 5.10.4 The secondary brake should b
Page 39 and 40: 5.13.5 The place where persons acce
Page 41 and 42: 6. SAFE AND PROPER USE6.1 Erection,
Page 43: 6.3 Safety Belt and Lifeline6.3.1 E
Page 46 and 47: 6.5 Marking of Safe Working Load an
Page 48 and 49: 6.7.1.3 The working platforms shoul
Page 50 and 51: 7.2 Wire Ropes7.2.1 All ropes shoul
Page 52 and 53: 8.1.5 During the inspection, functi
Page 54 and 55: 8.2.13 Functional tests of the foll
Page 56 and 57: 8.4 Display and Keeping of Certific
Page 58 and 59: (c)(d)(e)(f)(g)in case of a tempora
Page 60 and 61: 14. Guidance note on classification
Page 62: Occupational Safety and Health Bran

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