As 1576.4 Scaffolding Suspended Scaf

AS 1576.4—1991

Australian StandardR

Scaffolding Part 4: Suspended scaffolding

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This Australian Standard was prepared by Committee BD/36, Scaffolding. It was approved on behalf of the Council of Standards Australia on 20 August 1991 and published on 7 October 1991.

The following interests are represented on Committee BD/36: A.C.T. A.C.T. Administration, Office of City Management Aluminium Development Council Australian Federation of Construction Contractors Confederation of Australian Industry Department of Industrial Affairs, Qld Department of Labour and Industry, Tas. Department of Labour, S.A. Department of Labour, Vic. Department of Occupational Health Safety and Welfare, W.A. Master Builders Construction and Housing Association, Australia Metal Trades Industry Association of Australia National Association of Scaffolding and Formwork Contractors Workcover Authority, N.S.W. Work Health Authority, N.T.

 Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject to  periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is important  therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto.    1    0    0    2   p   e    S    5    0   n   o   g   n    i   r   e   e   n    i   g   n    E    h   g   u   o    l    C   y    b    d   e   s   s   e   c   c    A

Full details of all Australian Standards and related publications will be foun d in the Standar ds ds Australia Catalogue of Publications; this information is supplemented each month by the magazine ‘The Australian Standard’, which subscribing members receive, and which gives details of new publications, new editions and amendments, and of  withdrawn Standards. Suggestions for improvements to Australian Standards, addressed to the head office of Standards Australia, are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should be made without  delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued issued in draft form for comment as DR 90080.

AS 1576.4—1991

Australian StandardR

Scaffolding Part 4: Suspended scaffolding

First published as AS 1576.4–1991.    1    0    0    2   p   e    S    5    0   n   o   g   n    i   r   e   e   n    i   g   n    E    h   g   u   o    l    C   y    b    d   e   s   s   e   c   c    A

Incorporating: Amdt 1–1992

PUBLISHED BY STANDARDS AUSTRALIA (STANDARDS ASSOCIATION OF AUSTRALIA) 1 THE CRESCENT, HOMEBUSH, NSW 2140

ISBN 0 7262 7102 0

PREFACE This Standard was prepared by the Standards Australia Committee on Scaffolding. It is one of  a series of four Standards which collectively supersede and amalgamate AS 1575–1974, and AS 1576 1576–1 –197 974, 4, SAA Metal Tubes, couplers and accessories used in metal scaffolding and Scaffolding Code which will be withdrawn on 30 June 1992.

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E

Copyright Copyright — STANDARD STANDARDS S AUSTRALIA AUSTRALIA

Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information on commercial software royalties should be directed to the head office of Standards Australia. Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use exclusively in–house by purchasers of the Standard without payment of a royalty or advice to Standards Australia. Standards Australia will also permit the inclusion of its copyright material in computer software programs for no royalty payment provided such programs are used exclusively in–house by the creators of the programs. Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standard is amended or revised. The number and date of the Standard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time.

CONTENTS Page

SECTION 1 1.1 1.2 1.3

SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2 2.1 2.2 2.2 2.3 2.3 2.4 2.5

4.1 4.2 4.2 4.3 4.4 4.4 4.5 4.5 4.6 4.7 4.8 4.8 4.9 4.10 4.11 4.11 4.12 4.12 4.13 4.13

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5.1 5.2 5.3 5.4

10 10 10 10 10 10 10 10 10

GENE GENERA RAL L REQU REQUIR IREM EMEN ENTS TS

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GROU GROUPI PING NG OF LIVE LIVE LOA LOADS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WORKING ING LOAD LIMIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . STREN STRENGT GTH H OF SUPP SUPPOR ORTI TING NG STRUC STRUCTU TURE RE . . . . . . . . . . . . . . . . . . . . . LOAD LOAD–L –LIM IMIT ITIN ING G DEVIC EVICE E .................................... VERTICAL SPEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ROPE TENSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . STAB STABIL ILITY ITY OF CANT CANTIL ILEV EVER ER SUSPE SUSPENS NSIO ION N RIG RIG . . . . . . . . . . . . . . . . . CRADLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ROPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUSPEN SUSPENSIO SION N AND SECOND SECONDAR ARY Y ROPES ROPES . . . . . . . . . . . . . . . . . . . . . . . . SUSP SUSPEN ENSI SION ON RIG RIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUSP SUSPEN ENSI SION ON RIG RIG COMP COMPON ONEN ENTS TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECT SECTIO ION N5

8 8 8 8 8

MATERI TERIAL ALS S AND AND COMP COMPON ONEN ENTS TS

STEEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALUMINIUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SCAFFOLD TUBES AND COUPLERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUSPENSION AND SECONDARY ROPES . . . . . . . . . . . . . . . . . . . . . . . . SCAFFOLDING HOISTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . COUNTERWEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . STRUCTURAL PLYWOOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TROLLEYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECT SECTIO ION N4

4 4 4

DESCRIPTION OF SUSPENDED SCAFFOLDING

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SYST SYSTEM EM OF ATTAC TTACHM HMEN ENT T TO STRU STRUCT CTUR URE E .................... HORI HORIZO ZONT NTAL AL MOVE MOVEME MENT NT CAP CAPABILI ABILITY TY . . . . . . . . . . . . . . . . . . . . . . . SUSPENSION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TYPES OF CRADLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECT SECTIO ION N3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8

SCOPE AND GENERAL

11 11 11 11 11 11 11 11 12 12 12 12 12

ELECT ELECTRI RICA CAL L EQU EQUIPM IPMEN ENT T AND AND CONT CONTRO ROLS LS

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONTROL BOX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ELECTRICAL CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14 14 14 14

AS 1576.4—1991 1576.4—1991

4

STANDARDS AUSTRALIA Australia Australian n Standard Standard Scaffolding Part 4: Suspended scaffolding SECTION 1 SCOPE AND GENERAL 1.1 SCOPE SCOPE This This Stan Standa dard rd sets sets out out requ requir irem emen ents ts for for the the mate materi rial als, s, and and desi design gn,, of susp suspen ende ded d scaf scaffo fold ldin ing g incl includ udin ing g the the supporting supporting structure. structure. This This Stan Standa dard rd does does not not cove coverr buil buildi ding ng main mainte tena nanc ncee unit units. s. This This Stan Standa dard rd is to be rea read in conj conjun uncctio tion with with AS 1576 1576.1 .1.. The foll follow owin ing g docu docume ment ntss are are refe referr rred ed to in this this Stan Standa dard rd:: 1.2 REFERENCED REFERENCED DOCUMENTS DOCUMENTS The AS 1170 SAA Loading Code 1170 1170.1 .1 Part Part 1: Dea Dead and and liv live loa loads and and loa load combi ombina nati tion onss 1170.2 Part 2: Wind loads 1418 SAA Crane Code 1418 1418.1 .1 Part Part 1: Gene Genera rall requ requir irem emen ents ts 1418 1418.2 .2 Part Part 2: Seri Serial al hois hoists ts and and winch inches es 1444

Wrought alloy steels — Sta Standard and harde rdenability (H) series

1538

SAA SAA Cold-for formed Ste Steel Structures Code

1554

SAA Structural Steel Welding Code

1576 1576 1576.1 .1 1576 1576.2 .2 1576 1576.3 .3

Scaffolding Part Part 1: Gene Genera rall requ requir irem emen ents ts Part Part 2: Coup Couple lers rs and and acc accesso essori ries es Part Part 3: Prefa Prefabr bric icat ated ed and and tube tube-a -and nd-c -cou oupl pler er scaf scaffo fold ldin ing g

1577

Solid timber scaffold planks

1578

Lam Laminated timber scaffo ffold planks

1594

Hot-roll rolleed steel flat products

1664

SAA SAA Aluminium Structures Code

1665

SAA Aluminium Welding Code

1720 Timber structures 1720 1720.1 .1 Part Part 1: Des Design ign meth method odss

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1734

Aluminium and alum luminium alloys — Flat sheet, coiled sheet and plate

1866

Aluminium and alum luminium alloys — Extruded rod, bar, solid and hollow shapes

1867

Aluminium and alum luminium alloys — Drawn tubes

1874

Aluminium and alum luminium alloys — Ingots and casting ings

2269

Structural plywood

2317

Collared eyebolts

3190 3190

Appr Approv oval al and and test test spec specif ific icat atio ion n — Resi Residu dual al curr curren entt devi device cess (cur (curre rent nt oper operat ated ed eart earth h leak leakag agee devi device ces) s)

3569

Steel wire ropes

3678 3678

HotHot-ro roll lleed stru struct ctur ural al steel teel plat platees, floo floorp rpla late tess and sla slabs

3679 3679

HotHot-ro roll lleed stru struct ctur ural al steel teel bars bars and and secti ection onss

4100

SAA Steel Structures Code

For the the purp purpos osee of this this Sta Standar ndard, d, the the defi defin nitio ition ns given iven in AS 1576 1576.1 .1 and thos thosee belo below w appl apply. y. 1.3 DEFINITIO DEFINITIONS NS For 1.3.1 Articulated cradle — a crad cradle le of seve severa rall sect sectio ions ns hing hinged ed toge togeth ther er enab enabli ling ng work worker erss to walk walk from from one one sect sectio ion n to anot anothe herr (see (see Figu Figure re 1.2) 1.2).. 1.3.2 Bay length — the distan tance between any two longitudinally adjacent support points on a cradle measured horizontally. pecial ial purp purpos osee cra cradle dle comp compri rissing ing a seat. eat. 1.3.3 Boatswain’s chair — a spec weight ht or seri series es of weigh eights ts used used to coun counte terb rbaalanc lancee the the forc forces es on the the susp uspens ension ion rig rig agai agains nstt 1.3.4 Counterweight — a weig overturning. COPYRIGHT

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AS 1576.4—1991

1.3.5 Cradle Cradle — that that port portio ion n of the the asse assemb mbly ly inco incorp rpor orat atin ing g a susp suspen ende ded d plat platfo form rm.. method od of susp suspen endi ding ng a crad cradle le usin using g two two hois hoists ts and and two two susp suspen ensi sion on rope ropess 1.3.6 Double rope suspension system — a meth at each each supp suppor ortt poin point. t. cradle le whic which h does does not not trav traver erse se hori horizo zont ntal ally ly but but whic which h is capa capabl blee of bein being g rais raised ed and and lowe lowere red. d. 1.3.7 Fixed cradle cradle — a crad 1.3.8 Fulcrum Fulcrum point point — the point of pivoting nearest to the outside edge of the suspension rig about which the bala balanc ncin ing g mome moment ntss of the the susp suspen ensi sion on rig rig are are calc calcul ulat ated ed.. 1.3.9 Inboard Inboard portion portion of the suspensi suspension on rig — that that port portio ion n of the the susp suspen ensi sion on rig rig whic which h is on the the insi inside de of the the fulc fulcru rum m poin pointt (see (see Figu Figure re 1.1) 1.1).. 1.3.10 1.3.10 Individu Individual al cradle cradle — a cradle of one bay length (see Figure 1.3). the dist distan ance ce betw betwee een n the the fulc fulcru rum m poin pointt and and the the cent centre re of grav gravit ity y of the the susp suspen ensi sion on rig rig incl includ udin ing g 1.3.11 1.3.11 Lever Lever arm — the any counterweig counterweights. hts. NOTE NOTE:: The The proj projec ecti tion on leng length th is the the leng length th whic which h is used used in the the calc calcul ulat atio ion n of mome moment ntss for for stab stabil ilit ity. y.

1.3.12 Load-limiting device — a devi device ce tha that limi limits ts the the lift liftin ing g capa capaccity ity of a scaff caffol old d hois hoistt to a speci pecifi ficc load load belo below w the the stall tallin ing g load load of the the moto motor. r. the maxi maximu mum m forc forcee whic which h can can be impo impose sed d on the the susp suspen ensi sion on rig rig incl includ udin ing g 1.3.13 Maximum total suspended suspended load — the the the work workin ing g load load limi limitt on the the plat platfo form rm,, the the self self-w -wei eigh ghtt of the the plat platfo form rm and and the the susp suspen ensi sion on and and safe safety ty rope ropess toge togeth ther er with with any port portio ion n of the the mean meanss of sus suspens pensio ion n and and the the rope rope tens tensio ions ns,, and and any extr extraa forc forcee res resulti ulting ng from from the the oper operat atio ion n of the the equipm equipment ent and enviro environme nmenta ntall loads. loads. contin inuo uous us stru struct ctur ural al memb member er that that exte extend ndss from from the the susp suspen ensi sion on poin pointt to the the extr extrem emee inbo inboar ard d end end 1.3.14 1.3.14 Needle Needle — a cont of the the supp support ortin ing g stru struct ctur ure. e. the 1.3.15 Outboard portion portion of the the suspension rig — that portion of the suspension rig which is on the outside of the fulc fulcru rum m poin pointt (see (see Figu Figure re 1.1) 1.1).. frameed asse assemb mbly ly of one one bay bay leng length th,, inco incorp rpor orat atin ing g a walk walkin ing g surf surfac ace, e, whic which h is 1.3.16 Prefabricated platforms — a fram capable of connecting to its support structure in such a way as not to be inadvertently dislodged. One or more pref prefab abri rica cate ted d plat platfo form rm unit unitss can can be used used side side-b -byy-si side de and and endend-to to-e -end nd to form form a work workin ing g plat platfo form rm.. 1.3.17 1.3.17 Projectio Projection n length length — the the hori horizo zont ntal al dist distan ance ce betw betwee een n the the fulc fulcru rum m poin pointt and and the the susp suspen ensi sion on poin point. t. NOTE NOTE:: The The proj projec ecti tion on leng length th is the the leng length th whic which h is used used in the the calc calcul ulat atio ion n of mome moment ntss for for stab stabil ilit ity. y.

lifting ng appl applia ianc ncee manu manual ally ly oper operat ated ed or powe powerr-op oper erat ated ed thro throug ugh h whic which h the the susp suspen ensi sion on rope rope 1.3.18 Scaffolding hoist — a lifti passes. the cradle 1.3.19 1.3.19 Working Working load limit — the working load limit is the maximum live load which may be placed on the per per bay. bay. 1.3.20 1.3.20 Protecti Protective ve device device — a device which will arrest the descent and support a cradle or boatswain’s chair in the the event vent of the the fail failur uree of the the susp uspensi ensio on rope rope or the the scaf scaffo fold ldin ing g hois hoist. t. NOTE NOTE:: A prote protect ctive ive devi device ce may may also also preve prevent nt an over oversp spee eed d desce descent nt..

rope not not norm normal ally ly carr carryi ying ng the the weig weight ht of a crad cradle le and the the imp impose osed loa load, but but rigg riggeed for for use use 1.3.21 Secondary rope — rope with with a prot protec ecti tive ve devi device ce.. 1.3.22 Single-rope suspension suspension system — a meth method od of susp suspen endi ding ng a crad cradle le usin using g one one hois hoistt and and a sing single le susp suspen ensi sionrop onropee at each each supp suppor ortt poin point. t. 1.3.23 1.3.23 Stop Stop — the attachment at or near the end of a rail or track or at an intermediate point to prevent further trav traver ersi sing ng of the the crad cradle le..

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scaffo fold ldin ing g hoist oist which hich is mou mounted nted on the the suspe uspens nsio ion n rig rig or trol trolle ley y trac track k with with 1.3.24 Suspension-mounted Suspension-mounted hoist — a scaf one end of the rop rope attached to the crad radle. the asse assemb mbly ly which hich join joinss the the cradl radlee to the the suspe uspens nsio ion n rig. rig. 1.3.25 1.3.25 Suspensi Suspension on gear gear — the that poin pointt wher wheree the the suspe uspens nsio ion n rope rope is conne onneccted ted to the the suspe uspens nsio ion n rig. rig. 1.3.26 Suspension point — that 1.3.27 1.3.27 Suspensio Suspension n rig — that that port portio ion n of the the stru struccture ture (inc (inclu ludi ding ng the the trol trolle ley y trac track) k) mou mounted nted at a leve levell high higher er than than the the crad cradle le to supp suppor ortt and and posi positi tion on the the crad cradle le.. 1.3.28 Suspension ropes — rope ropess carr carryi ying ng the the weig weight ht of the the cradl radlee and and the the impo impossed loa load. cradle le capa capabl blee of bein being g move moved d hori horizo zont ntal ally ly.. 1.3.29 1.3.29 Travelling Travelling or traversin traversing g cradle cradle — a crad moving ng late latera rall lly y acro across ss the the face face of the the buil buildi ding ng in a cradl radle. e. 1.3.30 1.3.30 Traversin Traversing g — movi ropess rigg rigged ed for for the the purp purpos osee of trav traveersin rsing g the the cradl radle, e, but but not not carry arryin ing g the the weigh eightt of it. it. 1.3.31 1.3.31 Traversin Traversing g ropes ropes — rope 1.3.32 Traversing suspension rig — a suspe uspens nsio ion n rig rig moun mounte ted d on whe wheels els or casto astors rs and and suppo upport rtin ing g a crad cradle le.. 1.3.33 1.3.33 Trolley Trolley — a whee wheele led d mech mechan anis ism m inte intend nded ed to supp suppor ortt a seri serial al hois hoistt and and capa capabl blee of trav travel elli ling ng alon along g a susp suspen ende ded d track. the susp suspen ende ded d rail rail whic which h supp suppor orts ts and and guid guides es trol trolle leys ys in trav traver ersi sing ng inst instal alla lati tion ons. s. 1.3.34 1.3.34 Trolley Trolley track track — the radlee whic which h is supp suppo orte rted by a singl inglee susp uspens ension ion rope rope.. 1.3.35 Work cage — a cradl COPYRIGHT

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FIGURE 1.1 TYPICAL SUSPENSION RIGS

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FIGURE 1.2 TYPICAL ARTICULATED CRADLE

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FIGURE 1.3 1.3 TYPICAL INDIVIDUAL CRADLE

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AS 1576.4—1991 1576.4—1991

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SECT SECTIO ION N 2 DESC DESCRI RIPT PTIO ION N OF SUSP SUSPEN ENDE DED D SCAFFOLDING

Suspend pendeed scaf scaffo fold ldin ing g is desc descri ribe bed d acc accord ording ing to the the syste ystem m of attac ttachm hmen entt to the the stru struct ctur ure, e, the the 2.1 GE GENER NERAL AL Sus hori horizo zont ntal al move moveme ment nt of the the crad cradle le,, the the susp suspen ensi sion on syst system em,, and and the the type type of crad cradle le.. The sys system tem of atta attacchmen hmentt to the the struc tructu ture re may may be one one of the the 2.2 SYSTEM SYSTEM OF ATTACHM ATTACHMENT ENT TO STRUCTURE STRUCTURE The following: (a) (a) Syst Systeems which hich rely rely on coun counte terw rwei eigh ghts ts for for thei theirr stab stabil ilit ity. y. (b) (b) Syst Systeems which hich are secur ecureed to the the buil buildi ding ng or struc tructu ture re.. (c) A combination of systems specified in Items (a) and (b). The horiz horizon onta tall move moveme ment nt capa capabi bili lity ty may may be one one of the the foll follow owin ing: g: 2.3 HORIZONTAL MOVEMENT CAPABILITY The (a) Fixed. (b) (b) Trav Traver ersi sing ng crad cradle le.. (c) (c) Trav Traver ersi sing ng susp suspen ensi sion on rig. rig. The susp uspens ension ion syste ystem m may may be one one of the the foll follow owin ing: g: 2.4 SUSPENSI SUSPENSION ON SYSTE SYSTEM M The (a)  Hoist reeling — where the hoist reels the wire rope on to a drum within the hoist. (b)  Hoist climbing — where here the the hois hoistt ‘cli ‘climb mbs’ s’ upthe wire wire rope rope leav leavin ing g the the tail tail end end of the the rope rope hang hangin ing g or reel reeled ed onto nto a sepa separa rate te devi device ce belo below w the the hois hoist. t. The crad cradle less may may be one of the the foll follow owin ing g (see (see Fig Figure ure 2.1) 2.1):: 2.5 TYPES TYPES OF CRADLES CRADLES The (a)  Articulated cradle The The work workin ing g area area can can be a singl inglee dec deck or seve everal ral deck deckss bene beneat ath h eac each othe other. r. (b)  Individual cradle This This type type can can have have a sing single le deck deck or seve severa rall dec decks bene beneaath each ach othe other. r. (c)  Boatswain’s chair . (d) Work Work cage cage.

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FIGURE FIGURE 2.1 TYPES TYPES OF CRADLE

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SECT SECTIO ION N 3 MATE MATERI RIAL ALS S AND AND COMP COMPON ONEN ENTS TS 3.1 3.1 STEEL Steel Steel comp compon oneents nts shal hall be manu manuffact actured ured from rom steel teel comp omplyi lying with ith AS 1444, 44, AS 1594, 94, AS 3678 3678,, or A S 3679, as a pp ppr op opr iiaa te te. 3.2 ALUMINIUM ALUMINIUM Alumi lumin nium ium comp compo onents nts shall hall be manuf anufaactu ctured red from from alum alumiinium nium comp comply lyiing with with AS 173 1734, AS 1866, A S 1867, or A S 1874, as appropri at ate . 3.3 SCAFFOLD SCAFFOLD TUBES TUBES AND AND COUPLERS 3.3. 3.3.1 1 Tube S ttee el el a nd nd a lu lumi ni ni um um t ub ube s ha hal l comp ly ly w it ith A S 1 57 576.3 . 3.3.2 Couplers and accessories accessories Cou Couplers and and acc accesso essorries sha shall comp complly with with AS 1576 1576..2. 3.4 SUSPENSION AND SECONDARY ROPES Suspe Suspens nsio ion n and and second econdar ary y rope ropess shall shall comply omply with with AS 356 3569. Scaffol foldin ding g hoists ists shal shalll compl omply y with AS 1418 418.2. .2. 3.5 SCAFFOLDING HOISTS Scaf Counte terw rwei eight ght mater material ial shall hall be dura durabl ble, e, such uch that that the weigh weightt shall shall remain remain cons consta tant nt 3.6 COUNTERWEIGHT COUNTERWEIGHTS S Coun und er er w or or ki ki ng ng c on ond it it i on ons. Ba gs gs o f sa nd nd or s im im il ila r m at at er er iiaal s ha hal l n ot ot b e us eed d. Th e m as ass of t he he c ou oun te te rw rw ei eig ht ht, i n ki lo logra ms ms, shal l be ma rk rked o n it . Struct ctu ural ral ply plywoo wood shal shalll comp comply ly with with AS 2269. 3.7 STRUCTURAL STRUCTURAL PLYWOO PLYWOOD D Stru rolleys ys sha shall comp omply with AS 141 1418.2 and and the foll follow owiing requ equireme irement ntss: 3.8 TROLLEYS TROLLEYS Trolle (a ) Wh er ere i nt nt en ended for use wi th th a cr ad adl e, e, t he he t ro rol le le y sha ll ll be des ig ig ne ned t o inc or orpor at at e a s pa pace bar. (b) Th e w orki ng ng l oa oad li mi mit shal l be th e gr ea eat er er of — (i )

th e maxi m um r op ope t en ens io n; and

(i i )

5 k N.

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SECTION ECTION 4 GENE GENERA RAL L REQUI REQUIRE REME MEN NTS 4.1 GENERAL The The des design ign of struct tructura urall memb member erss and comp compon onen ents ts shall shall comp comply ly with with the rele releva vant nt requir requirem emen ents ts of t he he fo ll llo wi wi ng ng St an and ar ar ds ds: AS 1 17 170 .1 .1, A S 117 0. 0. 2, 2, A S 1 41 418, A S 153 8, 8, AS 1554, AS 1 66 664, AS 166 5, 5, A S 1720. 1 an d A S 410 0. 0. Th e d es esi gn gn s ha hal l t ak ake a cc cco un unt of : (a ) Wi nd nd s aaiil c on ond it it io io ns ns c re re at ate d b y a we at at he her c ov over, s aaff et ety s ccrre en eni ng ng, or ot he her s he hee ti ti ng ng m at ate ri ri al al at ta tac he hed to a scaffold. (b ) Th e n ee eed fo r o ve ver he hea d a nd nd s id id e p ro ro te tect io io n fo r t he he occ up upa nt nt s. s. The desi esign of all parts rts of the the instal nstallat latio ion n shall hall take ake acco accou unt of the the pos possible sible 4.2 GROUPING OF LIVE LOADS LOADS The groupi ng ng of t he he li ve ve l oa oads at one end of t he he cradle . he w or or ki kin g lo ad ad l im im it it s ha hal l b e n ot ot l es es s t ha han l i gh ght d ut ut y l oa oadi ng ng in ac co cor da dan ce ce 4.3 WORKING LOAD LIMIT LIMIT T he wi th th A S 1576.1. T he he worki ng ng l oa oad l im im i t, t, in kil og ogr am ams , shall be mar ke ked on t he he cr a dl e in each bay, in a pl ace whe re re i t i s cl ea ear lly y v is isi bl ble . 4.4 STRENGTH OF OF SUPPORTING STRUCTURE The The stru struct cture ure supp suppor ortin ting g the the suspe suspend ndeed scaff scaffold old syste system m sh al all b e abl e t o s us ust ai ai n t he he ma xi xim um um t ot ot al al su sp sp en ens io ion l oa oad. F or or mo bi bil e s ys yst em em s, s, th is is r eq equi rreem en ent a pp ppl ie ies t o a ll ll positio sition ns of its trav travel el.. Wh er ere s pr pre ad aders or p ad ads a re re u se se d to d is is tr tri bu but e a l oa oad on a r oo oof or par ap ap et et, t he he m at ate ri ria l s ha hal l be s uc uch t ha hat a pr op ope r di st str i bu buti on on of t he he l oa oad is a ch chi ev eved, a nd nd t ha hat t he he spr ea ea de der o r pad w il il l n ot ot a dv dve rs rs eell y d et et er eri or or at ate in t he he w or ork in ing environment. 4.5 LOAD-LIMITING DEVICE Electr Electric icall ally y powe powered red scaffo scaffold lding ing hoist hoistss shal shalll have have a devi device ce to limit limit the the liftin lifting g capaci ty ty of t he he hoi st st t o a ma xi xi mu mum 1.25 t im imes th e r at at in ing of s uc uch hoi st st . he v er ert ic ic al al s pe pee d o f a ny ny s us uspe nd nded sc af aff ol ol d s ha hal l n ot ot excee d 1 2 m /m /m in i n. 4.6 VERTICAL VERTICAL SPEED T he pe te ns nsi on on f or or el ec ect rriic al al ly ly p ow owe re red s ccaaf fo fo ld ldi ng ng h oi ois ts ts i s th e sum ma ma ti tio n o f th e l oa oad 4.7 ROPE TENSION TENSION Ro pe whic hich is limit limited ed by the the loadload-lim limiti iting ng device vice in Clause lause 4.5 4.5, the the grav ravitati itation onaal loa load of the the susp uspens ension ion rope rope and and any tensio tensionin ning g weight weight.. Ro pe pe t en ens io io n f or or o th ther th an an e le le ct ctr iicc al all y p ow ow er ere d s ccaaff ol old in ing hoi st st s shal l b e th e s um umm at at io ion o f — (a ) th e self w ei eig ht ht of t he he s us uspensi on on r op ope and any t en ensioni ng ng w ei eig ht ht ; (b ) th e se lf lf w ei eig ht ht o f t he he s ccaaff ol old in ing hoi st st a nd nd any s eecc on ond ar ar y ro pe pe dev ic ic e; e; (c ) th at at por ti ti on on of t he he sel f w ei eig ht ht of t he he cr ad adl e act in ing on th e r op ope ( or or t he he s el elf w ei ei gh ght of th e boat sw swain ’s ’s chai r) r) ; and (d) th e ra t ed ed li ve ve loa d f or or t he he cr ad adl e ta king i nt nto account grouping of l iv ive l oa oads or t he he rat ed ed li ve ve lo ad of th e boatswa boatswain’s in’s chair. chair. 4.8 STABILITY OF CANTILEVER SUSPENSION SUSPENSION RIG RIG 4.8. 4.8.1 1 Genera Generall anchorage.

S ta tabi li li ty ty of a canti le lever suspensi on on r ig ig a ga gai ns nst over tu tur ni ni ng ng shal l be by count er er we wei gh ght s or

4.8.2 4.8.2 Determinati Determination on of stability Fact Factor orss in the dete etermin rminaation tion of stab stabiility lity shall hall inc includ lude the fol followi lowin ng: (a ) Th re ree t im im es es th e r op ope t en ensi on on fr om om C la la us use 4. 7. 7. (b ) Th e g ro roup in in g o f s us uspens io io n r op opes re la la ti tiv e t o a tt tt ac achmen t poin ts ts.    1    0    0    2   p   e    S    5    0   n   o   g   n    i   r   e   e   n    i   g   n    E    h   g   u   o    l    C   y    b    d   e   s   s   e   c   c    A

(c ) Th e o ut utb oa oar d p or ort io io n o f t he he s us usp en ens io io n r iig g a nd nd any at ta tac he hed t rraa ve ver ssiin g t rraac k. k. (d ) Th e i nb nboa rd rd por ttii on on o f t he he s us usp en ensio n r iig g in cl cl ud udi ng ng cou nt nt er erw ei ei gh ght s i f used. 4.8.3 4.8.3 Lateral Lateral stability stability T he he suspe ns nsi on on r i g and c an an ti til ev evers , and t rraa ve ver ssiin g t rraa ck ck i f u se se d, d, sh al al l h av av e adequ at at e latera aterall stren strengt gth h or be ade adequa quately tely bra braced ced agai agains nstt later lateral al sway sway in the the lon longitud gitudin inal al dire direct ctiion. on. NOTE NOTE:: The The forces forces prod produc ucin ing g late latera rall sway sway incl includ udee wind wind force forces, s, surge surge from from brak brakiing, and and the the appl applie ied d force force from from trave travers rsin ing g lines lines..

Fo r a wi rree r op ope br ac aced su sp spen si si on on ri g, g, t he he r es es tr tra in ini ng ng w ir ire ro pe pes s ha hal l be so ang le le d i n p la la n, n, o r sup pl pl em eme nt nt ed ed b y addi dditiona tionall angl angleed wire wire rope ropess or other ther mean meanss that hat late laterral stab stabili ility ty in bot both direct irection ionss is achie chiev ved. ed. 4.8.4 4.8.4 Counterweig Counterweights hts C ou ounte rw rweig ht hts s ha hall be f ix ix ed ed t o the s us uspensi on on r ig ig i n suc h a way as to pre ve vent th ei eir disl islodg odgemen ementt und under all all exp expecte ected d con conditio ditions ns of oper operaation tion of the the equ equipme ipmen nt. uspens io io n anchor ag age poi nt nt s s ha hal l t ak ake i nt nt o acc ou ount the natu re re of th e 4.8.5 Suspension anchorage points S us mate aterial rial into nto whic hich the the anc anchor hor is fasten fastened ed.. Dr il ill ed ed-in anchor s, s, w he het he her expandi ng ng or chem ic ic al al t yp ype, s ha hal l not be used in an anchorage syst em em t o r es esi st st a tensile tensile (pull-o (pull-out) ut) force. force. Bo lt lts u se sed i n an a nc ncho ra ra ge ge s ys yst em em s ha hal l b e fi tt tt ed ed w it it h lo ck ckn ut ut s. s.

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4.9 4.9 CRADLE CRADLE he wi dt dt h of t he he pl atf or orm s hal l be not l es ess t ha han 450 mm. 4.9. 4.9.1 1 Width Width T he 4.9.2 4.9.2 End extension extensionss En d e xtens io ns t o th e cr adl e shal l be l im im it ed ed i n l en engt h t o t ha hat a ll ow owed by t he he c r ad adle design. 4.9.3 4.9.3 Decking Decking T he he d ec ecki ng ng of t he he pl at atf or orm shal l h av ave a su rf rfa ce ce th at at d oe oes not b ec eco me me s li lip pe per y under expec te te d work orking ing cond condiitions tions.. It sha shall be fixe fixed d so that that it cann annot be acci cciden dentally tally disp isplac laced. ed. Exce Excep pt to the exte exten nt nece necess ssaary for dra draina inage, ge, the deck ecking ing shal hall be clos closel ely y boa boarded rded,, plank lankeed, or plat lated. ed. A prefa refab bricat ricateed plat latform form shal hall comp comply ly with with the the perf perfor orm manc ance requ require ireme ment ntss of AS 1576 1576.3 .3.. Sc af aff ol old pla nk nks if used f or or decki ng ng s ha hal l compl y w it it h A S 1577 or A S 1578. Guardrai rails, ls, midra midrails ils and and toebo toeboar ards ds shall hall be desi designe gned d in acco accord rdan ance ce 4.9.4 Guardrails, midrail, and toeboards Guard wi th th A S 1576. 1 a nd nd fi t te te d to t he he per iim m et ete r o f t he he p la lat ffo or m. m. Wh er ere t he he cr ad adle i s t ie ied t o th e bui ld ldi ng ng and t he he bui ld ldi ng ng f or orm s a barr ie ier at t ha hat l ev evel, th e i nn nner guar dr dra il ils m ay ay be r em emov ed ed p ro rovi de ded t he hey a re re n ot ot an i nt nte gr gra l c om ompo ne nent o f th e c ra radl e desi gn gn. 4.9.5 4.9.5 Suspension Suspension link T he he desi gn gn of t he he li nk nk us ed ed t o at ta ta ch ch t he he hoi st st t o th e cr ad adl e s ha hal l ta ke ke in to to account any fo rc rce s re su sul ti ti ng ng fr om om o ut ut of le ve vel o f t he he cr ad adl e i n a ny ny d ir ir ec ect io io n. n. 4.9.6 4.9.6 Buffers Buffers W he her e f ac ace w al al l r ol ol le ler s or buff er er s a re re used, t he hey shall be a tt tt ac ached to the c ra radle , and vi si si bl ble t o the oper operato ator. r. rt i cu cula te ted c ra radl es es s ha hal l be d es es ig igned t o ta ke ke in to to acc ou ount t he he c on onf iig g ur ura ti ti on ons and 4.9.7 4.9.7 Articulated Articulated cradles cradles A rt resulti resulting ng loads. loads. Th e h in inge d a re rea s ha hal l b e des ig ig ne ned t o m in in im imi ze ze g ap aps in t he he d ec ecki ng ng, g ua uard ra rai ls ls a nd nd to eb eboa rd rd s. s. Variouss shap shaped ed crad cradle less may may be used used,, and and such such confi configu gura ratio tion ns shall shall be spec specif ifica ically lly des designed igned 4.9.8 Other shapes Variou and spec speciial atten attenti tion on paid to the the requ equired ired susp suspeensio nsion n rig. 4.9.9 Boatswain’s Boatswain’s chair The The scaf scafffoldin olding g hois oist fitte fitted d to a boatsw atswain ain’s ’s cha chair sha shall be capa apable ble of bei being manu anually lly ope ra rat ed ed by t he he user, i n a saf e m an anner , i n an emer ge gency or powe r fail ur ure. 4.10 4.10 ROPE ROPE Fi br bre ropes shal l n ot be used f or or the l if if ttii ng ng or s uspensi on on of scaf f ol ol din g, but m ay be used for traversing. St ee eel w ir ire r op ope of a con st st rru u ct cti on on o th ther th an an th at at re co comm en ended b y t he he sc af aff ol old in in g h oi ois t man uf uf ac act ur ur er er s ha hal l not be used w it it h such a hoi st st . NOTE NOTE:: Galv Galvan aniz izin ing g of steel teel wire wire rope rope is recom recomme mend nded ed..

4.11 4.11 SUSPENSION SUSPENSION AND AND SECONDARY SECONDARY ROPES Susp Suspen enssion ion and and secon econd dary ary rope ropess each each sha shall be termi termina natted at t he he r iig g end wi th th a th im im bl ble e ye ye s pl pl ic ice , or f er er ru ru le le se cu cur ed ed e ye ye te rm rmi na nat io io n or o th th er er r op ope c ou oupl in ing devi ce ce w hi hic h doe s not damage th e ro pe pe a nd nd gi ve ves a str en ength of not le ss ss t ha han 80% of t he he bre ak aki ng ng l oa oad of th e rope. Th e r op ope sha ll hang f re re ely fr om om th e s uspens io n r iig g by an eye w hi hic h compl ie ie s wi th th AS 2317 and s hal l not be reev eeved thro throu ugh the eye. ye. Rope ope bulle bullett end end termin erminaation tion sha shall be suit uitable able for for its purp purpos osees and and fini finish shed ed to prev preveent ove overlayi rlaying ng.. Wher here app appropr ropriiate, ate, the tail ail end end of the the rop rope shal hall be fitt fitted ed with a sui suitable table rope ope clamp clampin ing g devi evice to preve preven nt the rop rope pass assing ing throu through gh the the hoist. Th e r op ope s hal l be l on ong enough s o t ha hat th e syst em em does not run out of ro pe. A se co condar y r op ope s ha hal l h av ave a st rree ng ngt h o f n ot ot le ss ss t ha han t he he r el ele va vant s us usp en ensi on on r op ope .    1    0    0    2   p   e    S    5    0   n   o   g   n    i   r   e   e   n    i   g   n    E    h   g   u   o    l    C   y    b    d   e   s   s   e   c   c    A

The fulcru ulcrum m poi point for for stat tatic sus suspens pensio ion n rig is show hown in Figu Figure 1.1. .1. The fulc fulcrrum point 4.12 4.12 SUSPENSIO SUSPENSION N RIG The fo r a mo bi bil e su sp spens io ion r i g is th e c en ent rree -l -li ne ne o f t he he fr on ont w he hee l. l. Ade qu qua te te means s ha hal l b e p ro rovi de ded t o ens ur ur e th at at th e s us uspen si si on on s ys yst em em s ha hal l not sl i p o ff ff t he he e nd nd of t he he nee dl dl e. e. 4.13 4.13 SUSPENSION SUSPENSION RIG RIG COMPONENTS COMPONENTS 4.13.1 4.13.1 Trolley track track Susp Suspen enssion ion from rom a scaf scafffold coup oupler ler des designe igned d for joi joining ning tub tubes is not perm ermitted itted.. St op ops s ha hall be at ta ta ch ched to t he he t rro ol le le y tr ac ac k usin g a posi ti tiv e me th th od od (e .g .g. n ut ut a nd nd bolt ) . F ri ri ct cti on on s to to ps ps sha ll ll n ot ot be use used. ara pe pet c la la mp mps s ha hal l b e used o nl nly wh er ere th e para pe pet h as as a de dequ at at e s tr tre ng ngt h. h. 4.13.2 4.13.2 Parapet Parapet clamps clamps P ar NO TE TE : P ar ar ap ap et et c la la mp mp s s ho ho ul ul d no t be u se sed o n b ri ri ck ck pa ra ra pe pe ts ts .

her e a wi re re rope pass es es over pul le leys or ar ou ound dr um ums ot he her th an an i n w in inches and cl im im bi bing 4.13.3 4.13.3 Pulleys W he devi evices ces, such uch pull pulley eyss or drum drumss shal shalll have have pit pitch circle ircle diam diamet eteers in acco ccorda rdance nce with with AS 141 1418.1. 8.1. Gui de de pul le le ys ys ext er ernal to t he he w in inc h or cl im im bi bing devi ce ce shall have pi tc tc h ci rc rcle dia me met er ers i n accordance wi th th AS 1418 1418.1 .1..

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protect ective ive devic devicee shall shall be provide rovided d for each each scaf scaffol foldi ding ng hoist hoist.. The The prot protect ective ive devi device ce 4.13.4 4.13.4 Protective Protective device A prot shal hall oper operate ate on the susp uspens ension ion rope rope abo above the scaf caffold foldiing hois hoistt or on a seco econdary ary rop rope. A prote protect ctiive dev device ice shal shalll compl omply y with with the follow following ing requ require ireme ment ntss: (a ) Th e d ev evi ce ce s ha hal l b e desi gn gned t o w it it hs hst an an d t he he g re re at ate st st of t he he f ol oll ow owi ng ng: (i )

Th e c om ombi ne ned l oa oadin g of th e w or orkin g lo ad ad l im imi t and m as ass of t he he e qu qui pm pment i n mot io ion .

(i i) i)

Th e in er er ti tia ll-e ff ff ec ect lo ad adi ng ng of the combin ed ed l oa oadin g of maxi mu mum w or ork in ing l oa oad l im imi t a nd nd m as ass of th e equ ip ip me ment i n mo ti ti on on r es es ul ul ti tin g f ro rom th e o pe per at at io ion of t he he p ro ro te tec ti tiv e d ev evi ce ce u nd nde r f re re ee- fa fal l st op oppin g cond conditi ition onss for for the rate rate of dece decele lerat ration ion dete determi rmined ned by rati rationa onall analy analysis sis,, witho without ut stress tressing ing any any comp compon onen entt in excess of 75% of i ts ts yi el eld s tr tr es ess.

(iii) iii)

The iner inerttial-e ial-effe ffect ct loa loadin ding of the the combi ombin ned load loadin ing g of the the work workiing load load limitan limitand d mass ass of the the equ equipm ipment ent in motio motion n due due to the the oper operaation tion of the pro protect tectiive devi device ce unde underr ove overspe rspeeed stop stopp ping ing cond conditi ition onss for for the the rat rate of dece decele lera rati tion on det determin ermined ed by ration ational al anal analy ysis sis witho ithou ut stress tressiing any any comp compo onent nent in exce excess ss of 75% 75% of  its yiel ield stress tress..

(b ) Mea ns ns s ha hall b e pr ov ovi de ded t o dea ct ct iv ivate t he he d ev evi ce ce. (c ) Th e d ev evi ce ce s ha hal l be mou nt nt ed ed i n s uc uch a w ay ay th at at t he he st ab ab il ili t y of t he he cr ad adl e is not a dv dver sseel y af fe fe ct cte d w he hen th e devi device ce is acti activat vated. ed. secon ndary dary rope ope, wher here fitte fitted, d, sha shall be inde indep pend endently ently attach ttached ed to the the susp suspen enssion ion rig. 4.13.5 4.13.5 Secondary Secondary rope rope A seco

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AS 1576.4—1991 1576.4—1991

14

SECTION ECTION 5 ELEC ELECTR TRIICAL EQUIP EQUIPME MENT NT AND CONT CONTROL ROLS S le ct ctr iicc al al e qu qui pm pme nt nt and c on ont rro o ls ls sha ll ll c om om pl ply w it ith AS 1 41 418. 2 and th e re qu qui rreem en ent s of t hi his 5.1 GENERAL GENERAL E le Section. Wheree a cent entral con control trol box box is fitt fitted ed,, the the main main sup supply cabl able sha shall be plug plugged ged into the box. ox. 5.2 CONTROL BOX Wher Fr om om t hi his box s eep par at at e y ok oke s sha ll ll le ad ad t o t he he wi nc nche s. s. The cen central tral cont ontrol rol box box, if fitt fitted ed,, shal hall incl nclude ude the follo followi win ng feat feature ures: s: (a) Sock ocket-o et-ou utlets tlets for winc winch hes. (b ) An e me mer ge gen cy cy s to to p but to to n. n. (c ) A pow er -o n li gh ght . (d) A Ty pe pe I or T yp ype II r es esi du dual c ur urr en ent devic e com pl pl yi yi ng ng w it it h A S 3190. The The cont control rol box box shal shalll be fully fully encl enclose osed, d, lock lockable able,, shatte hatterpr rproo ooff and and weathe weatherp rproo roof. f. It shal shalll be remov removaable ble for for safet safety y an d s eecc ur uri ty ty b ut ut a t t he he sa me me t i me me s ha hal l b e se cu cur el el y a tt tt ac ached t o t he he gua rd rd ra rai ls ls o f th e c ra ra dl dl e o n t he he s id id e a wa wa y f ro ro m th e buil di din g fa ce ce wh en en i n u se se. he h oi oi st sts s ha hal l b e oper at ate d at t he he h oi ois t, t, f ro ro m a c en ent ra ra l c on ont rro o l b ox ox, o r by t he he us e o f p en en da dant 5.3 CONTROLS CONTROLS T he cont ontrols rols withi within n the crad cradlle in acc accorda ordan nce with with AS 141 1418.1. 8.1. All operat erating ing buttons tons and lever leverss shal shalll be of the the sprin spring g-loade loaded d ‘dea ‘deadd-m man’ an’ type ype. Th e e le le ct ct rriic al al c on ont rro ol sys te te m s ha hal l be des ig ig ne ned so t ha hat any e le le ct ctr i ca cal fa il ilu re re or m al alf un unc ti ti on on wo ul ul d ca us use t he he syst ystem to fail fail to safe afety. ty. Prote Protecction tion shal hall also also be provi rovid ded agai gainst nst pha phase reve reverrsal sal in 3-ph -phase ase syst systeems. ms. Electri rica call cabl cables es sha shall comp comply ly with with the follo followi wing ng requ require ireme ment nts: s: 5.4 ELECTRICA ELECTRICAL L CABLES CABLES Elect (a) Electri lectrica call cable abless shall hall be purpos rposee desi esigne gned. (b ) Ca bl ble s s ha hall only be su sp spen de ded f ro ro m a dev ic ic e t ha hat d oe oes n ot ot d am am ag age t he he c or or e w ir ire s. s. A b ui uil t -i -i n t hi him bl bl e i s one fo rm rm o f s uc uch dev ic ic e. e.

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