IS: 2750 · 1964 I rulian Standard SPECIFICATION FOR STEEL SCAFFOLDINGS (Reaffirmed 2006) Fifth Reprint JULy 1992 ( Incorporating Arnendmenll No.1 & 2 ) UDC 69.057.6:669.14 BUREAU OF INDIAN STANDARDS MANAK BHAVAN. 9 BAHADUR SHAH ZAPAR MARG NEW DEIJU IlOOO2 Gr 6 August 1964 181 2750-l96f I ndian Standard SPECIFICATION FOR STEEL SCAFFOI..,D-INGS Construction Plant and Machinery Sectional Committee, 80C 28 MAJ GZN Chairman R. A. LoOIlBA IUpr,sntti"l Engineer-in..Chief'. Branch, .Arrny Headquarters Engineer-in-Chief''s Branch. Army Headquarters MnnNr'; Baro N. S. BHAGAT Roads Wing, Ministry of Transport Jeuop &: Co. Ltd., Calcutta Centr-al Water & Power Commission (Mlniltry ot Irrigation & Po~r) Snar C. R. CaoP&j. ( Altmtct' ) . SURI R. K. DA8 GUPTA Simplex Concrete Piles ( India) Ltd .· Calcutta Saar A. D. DRI~ORA Heady & Gresham Ltd., Calcutta SUlLt N. KUMAR. ( Alfmta',) DIREOTOR ( CIVIL ENoINKXaING) Railway Board ( Mini,try of Railway. ) JOINT DIRECTOR (WORQ) (Altmsau) . BRIG N. B. GBANT .Research and Development Organization (Ministry of Defence) Saat M. A. HAJ'BKZ National Buildings Organisation 811Bl K. S. SRINIVA8~ (Altmtau) SR.I R. K.J.JODIA. Lynx Machinery Ltd., Calcutta Ms. K. G. JONES Forbes Forbes Campbell & Co. Ltd., Bombay SaRI S. B. PATBL ( AIUnt4lt ) SRBIA.K.KsANDELWAL Khandelwal Manufacturing Corporation Private Ltd., Bombay SaRI M. R. MARA-DEVAN United PJ'ovinces Commercial Corporation Private Ltd., New Delhi SIIIU L. R. M ·· W.ADI Hindustan Construction Co. Ltd., Bombay SlIat B. D. MATKua Public Worlc. Department, Govemment of Rajuthan 5BRI SB1U SRBI R. S. BHALL~ SBKI A. B. Ca.UDBUBI SaBI S. P. CaUOH LT-CoL R. N. KANwAa (Alum41l) v. R. BSATN.1GAB (AltlrnaU) MAZONDAR GUBA Tft4IC.UBTj. SHar U. r"fATHOR S. C. MarshaU. (Directions ) Private Ltd., Calcutta Gannon Dunkerley & Co. Ltd., Bombay (AlunuJu) S.RI S. K. 5uIU H. V. MI&cBANDANI Central Building Roorkee Research Institute (CSIR), SHRI B. C. SalvASTAV A. ( AI14f11aU ) SHRI B. NAOCffAUDHU.B1 C. Cornens &. SRIH K. BA!;U ( Alternat« ) Snur K. K. NAJdlHAB The Concrete SURI C V. N.t.I.l\BT\i (Al.nn41.) s Sons Ltd., Calcutta Association of India, Bombay ( ContiuUtJ Oil par« 2 ) BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DEUlI 110002 ( ~Jr- /MI' I ) MnltHrs !UJms'MlsI Snar K. NAT.uA1AX In persona! capacity ( T.I. (jI Sales LlJ., C-UIdU) SHat I. C. PAT8L Sayaji Iron and Engineering Private Ltd., Baroda SB~ M. B. M_JlTA ( AllITuu ) SR.! Y. G. PATJIL Builder'. Aaoci.tlon of India, Bombay Ssax 1U.1~ G AUT A M William Jacks & Co. Ltd., Calcutta NA.AYAK S.aJ R. S. GoDBOL. (A/lnlUlt,) SSaI G. S. Rov ·· JUt Armstrong Smith Private Ltd., Calcutta SJUU U. G. KALYANPUa (Allm,au) SSaI V. SAKKA.~ National Buildings Construction Corporation Ltd., New Delhi SB&I Z. S. 5114. Burmah-Sbell OU S torage & Distributing Co. of India Lrd., Bombay SHal M. R. MALTA (Altnuu) SHill D. S. SHli:NOY Killick Nixon ~ Co. Ltd., SBBl A. T. KOTIlA V AU. ( AIIn7tQU ) Bombay SIND4 Directorate General of 'Technical Development SuaJ P. P. SIBDUBPANDJI Miller-. Timber and Tradi ng Co. Ltd., Bombay Ma. W. A. FEaN.NDU (AltmuzU) DB. DB. SUBBAR4JU Central Road Research Instiute (CSIR), New Delhi Snnt S. K. SUPEILINTENDIlfO SURVEYOR Woau ( ELECT) ow Central Public Work. Department Ex KOUTIV. EHQJN &Ka (ELAND XOT), M&OHANIC..tL WOauBOP DIVI8ION SSllI]. A. TAB.4POBEVALA. Ma. N. H. TAYLOa SHBt T. H. PUBORI ( Alt"n4lI ) COL H. C. VIlB Balmer Lawrie &: Co. Ltd., Calcutta Da. H. C. VI.vav ABA Y A, Director, lSI ( &-(J./fieitJ M,mhtr ) Deputy Director ( Bldg) $«t"tJry (AltmuJl') Shah Construction Co. Ltd., Bombay Recondo Ltd., Bombay Smu Y. R. T4lfEJA Extra AaUtant Director ( B1dg ), lSI Panel for Metal Scaffolding) BOG 28fP-l CMwnw, SHRJ H. v. MIBCBAlfDAlfl M1m6"s K04NDWLWAL Central Building Research Institute ( CSIR ), New Delhi Khandelwal Manufacturin~ Saar A. K. Corporation Ltd., S8.1 N. Kuw.- Bombay HeatJy & Gresham Lrd., Cakutta 2 AMENDMENT NO. 3 TO JUL Y 1980 IS : 2750-1964 SPECIFICATION FOR STEEL SCAFFOLDINGS Alterations ( Page 4, clause 2.2.1 ) clause: Substitute the following for the ex ist ing rows of securely br acinz unless so '2.2.1 Independent Scaffold - The scaffolding supported on two upr ig hts, independent of the structure under construction but supported ag ai nst collapse with the help of proper strutting or and rigidly connected with the building or other structure designed to ensu re s t a bi 1i ty wi t hou t such connection.' 'NOTE Tall independent scaffo ld ings a re usually tied to the st r uci ur e at s utt a ble intervals or otherwise supported at suitable intervals for additional stability: (Page 6, clause 2.3.14 ) - Substitute the following for the existing clause: '2.3.14 Putlog, Ancillary or Intermediate ( or Board Blare, ) - A tube or other member spanning from ladger to the wall of a building which may have an attached coupler for the purpose of securing such tube or member to a ledger and which may have a specially formed end ( which may be detachable) for the purpose of fixing into brickwork, and used between putlogs for the purpose of supporting scaffold boar ds at positions and spacing required.' ( Page 7, clause 4.1.1) clause: Substitute the following for the existing "4.1.1 Ste el rubes for individual component types scaffolding shaJJ bp of heavy class welded or seamless tubes of 40 rom nominal bore and of grade not less than YST 22 of IS ~ J 161-1968 'Specification for Steel Tubes for Structural Purpose! ( Second Recision )'." ( Page 7, clause 4.1.2 ): a) Line 3 h) Lint 5 Substitute ( IS : 1161·1968' for cIS: 1161·19f>3'. Substitute ( IS : 806·1968 Code of Practice for Use or Steel Tube! in General Bui ld ing Construction (First Reuision ) ) (or cIS: 806-1957 Code of Practice for use of Steel Tu be! in ·General Building Construction ': ( Page 13, (faust 4.2 ) clause: Substitute the following- for the existing OrJ All fittings shall be manufactured from steel which when analysed in accordance with the relevant part of IS : 228 Methods of Chemical Analysis of Pig Iron, Cast Iron and Plain Carbon and Low Alloy Steels shall show not 'more than 0'06 percent of sulphur, and not more than 0-06 percent of phosphorous and shall also conform to steels of Schedule I I of IS : 1570·1961 'Schedules for Wrought Steels for General Engineering Purposes'." ( Page 13, clauses 4.3.1 and 4.3.2 ) existing clauses: "4.2 Steel Fittiogs - Substitute the following for the "4.3.1 Steel sections and bars shall conform to IS : 226-1975 'Specification for Structural Steel ( Standard Quality) ( Fifth Revision)'. 4.3.2 Rivet bars shall conform to IS : 1148-1975 'Specification for Hot Rolled Steel Rivet Bars ( Up to 40 rom Diameter) for Structural Purposes ( First Reoision )'." ( Page 14, clause 4.4) clause: Substitute the following for the existing "4.4 801t. and Nut. - Bolt! and nuts shall have mechanical properties not less than those specified in Table 5 (4D) of IS: 1367-1967 'Technical Supply Conditions for Threaded Fasteners ( First Revision)' and shall also conform to the requirements of IS : 1362-1962 'Dimensions for Screw Threads for General Purposes ( Diameter Range 1·6 to 39 mm) (Rtvisld)' \v here applicable." (Pages 14 and 15, clause 6.2 ) existing clause: Substitute the following for the (6.2 The manufacturer or supplier shall also produce sufficient evidence ( either calculations or test data) in fulfilment of the design criteria ( see 5.1 and 5.2). Where so required by the purchaser or U5~r) the manufacturer or supplier shall furnish and wherever possible suitably exhibit on the scaffolding, the following particulars: a) Design load which may be imposed on the scaffolding as a whole. and the distribution of this load upon which the design of trestles, tripods or unit frames is based; b) Limitations of height, width or breadth in any direction, with or without support! derived from the structure; c) Maximum distance to which the scaffolding can be extended beyond a given dimension in any direction, and tbe type of support required for the purposes; and d) Any other restr ictions on the usage or transportation of scaffoldings, fittings. prefabrlcated frames and component· .' ( Pag« IS, clause 7.3.3.1 ) accordingly: Delete and renumber subsequent clauses 2 [ Pag, 18. clause 7.3.S.1(a) and (b) ] - Substitute the following for the existing matter: a) Test for diSlorlion - The coupler. connecting two lube, at a 45° angle and suitably prevented from slipping on both tubes 3! shown in Fig. 9 shall be capable of supporting without distortion a load of l-S tonnes. b) Test for slip - The coupler, connecting two tube, at a 45° angle as shown in Fig. 10 shall be capable of sustaining a load of 1·25 tonnes applied to the vertical tube. During this test the coupler shall not rotate through an angle greater than 10° from the horizontal. LOAD TUBE NOT FIXED BUT GUIDED IN DIRECTION AND SUiTAeo' PREVENTED FROM LOAD SLIPPING THROUGH THE COUPLER rt.8E RIGiDlY SECURED FlO. 9 TE!T POR DUToaT10N OF SWIV&L CQUPUIU ( Page 18. clause 7.3.6 ) clause: Substitute the following for the existing '7.3.6 Putlog Couplers - The grip afforded by · putlog coupler shan offer adequate resistance to horizontal or asi.1 rotation. slip or accidental displacement of a putlog. A putlog coupler shall be capable of puaing the following test: Test for Slip - The coupler connecting two tubes at right anllet, as shown in Fig. II and assembled ., recommended by the manufacturer. shall be capable of sustaining load of 130 kg applied to the horizontal putlog or transom. Non - A putiOi coupler aball be capable of aatiafyinctbe test for alip and alaall be of such a anape .. to be readily diallncuiahablc from a rlCh l a",le coupler.· 3 \.0-.0 J TUBE NOT FIXED aUT GUIDED IN DIRECTION Fro. 10 Ta5T '\ iUTLOG COUPL R \NDER TEST FOR SUP Of SWIVEL COUPLER e \UPLER . AXIAL PUll~ _ - - - - - - 610 mm ---------~ FIXED SCAFFOLD TUBE TO REPRESENT WEOGER FlO. FIXED SCAFfOLD TUBE.> TO ACT AS A GUIDE 11 RIO FOR SLIP TESTS ON PuTLOO COUPUUl.S ( Pal' 20, claw, 7.3.10.3, lin, 2 ) - Substitute' Fro. 12' for ( FlO ~ '. ( Pat' 20, Fig. 9, caption) - Substitute · FlO. 12' for · Fro. 9'. ( Pag, 21, claw, 7.4.4.1) - Subatitute the following for txirting clause; '7.4.4.1 Adjustmen; of luight of tripod - Where tripods are capable of adjustment for h~ight, the means of adjustment shall be such that when adjusted at any height, it shalt be incapable of displacement under vibration or shock during normal conditions of usage.' ( Page 21, clsuse 7."5 ) - Substitute the following for the existing clause: '7."5 The shorter of the base dimensions of a trestle shall be at least one-fourth of the height of the trestle. In case of a trestle of adjustable height, the height for the purpose of this standard shall be maximum height to which the trestle can be adjusted. 7.4.5.1 Adjustment for the height of trestle - Where trestles are capable of adjustment for the height, the means of adjustment shall be such that when adjusted at any height, it shall be incapable sof disturbance, or displacement under vibr ation or shock during normal conditions of usage.' ( Page 22, clause 7.4.7.2 ) - Substitute the following for the existing clause: "7."7.2 tYtlding - Welding shall be carried out on steel tubes in accordance with IS : 6'127-\91\ 'Code ot Practice for Use of Metal Arc Welding in Tubular Structures', and on other steel sections in accordance with IS : 816-1969 'Code of Practice for Use of Metal Arc Welding for General Construction in Mild Steel (First Rtv;Jio1l)' or IS: 1323-1966 'Code of Practice for Oxy-Acetylene Welding for Structural Work in Mild Steel ( Retnsed ( Pal~ 23, clause 9.1, lin, 1 ) - Substitute' may' for ( shall '. r.:: Addeada ( Page 6, clause 2.3.23) Add the following new clauses after 2.3.23: '2.3.24 Scaffolding - A temporary structure on which persons work, and which provides support for plant and materials used in building construction, maintenanee, repair and demolition work. 2.3.25 Slee» and to end.' Coupil' - An external fitting for connecting two tubes ( Pag« 21, clause 7.3.12.2 ) - Add the following new claule after 7.3.12.2: '7.3.1' SUIDI Coupllr - A sleeve coupler shall be selfcenrring when plain ended tubes are being joined so that an equal length of sleeve shall engage both the tubes connected by the sleeve, It shall have, in every position, a resistance to bending at least equal to that of the tube with which the sleeve coupler is intended to be used. When used in tenaion, it shall resist, without slipping, an axial load of not leu than 635 ka.· ( SOC 28) Reprography Unit, B15, New Delhi. Iodin U I 2'150 ·1964 Indian Standard SPECIFICATION FOR STEEL SCAFFOLDINGS o. FOREWORD 0.1 This Indian Standard wu adopted by the Indian Standards Institution on 27 May 1964, after the draft finalized by the Construction Plan' and Machinery Sectional Committee had been approved by the Building Division Council. 0.2 Metal scaffoldings are being increasingly used these days because of their several advantages over the conventional type of timber scaffoldings, such u ease and rapidness with which they may be erected, dismantled, stored and re-wed, rigidity of construction and more reliable assessment of their performance. Though metal scaffoldings may be constructed from steel or aluminium alloy tubes and fittings, almost all the metal scaffoldings wed in this country at present are constructed from steel tubes and fittings. This standard, covering steel.scaffoldinga suitable for use in normal building construction work, has been prepared with a view to ensuri~ their safe and satisfactory performance and it ill intended to serve as a guide to the manufacturers and wen. Tubes, fittings and prefabricated frames covered in this standard are intended only for the usa~e and loading conditions customary in normal building construction practice. ~ffoldings intended for special situations of use, where storage of materialt, housing of machinery and equipment or abnormal and heavy concentrated loads occur on the acaffoldJ, are not covered 'in this standard, although fittings referred to in thiJ standard rna y sometimes be wed in the construction of's uch scaffoldings also. 0.3 The Sectional Committee responsible for the preparation of this standard has taken into consideration the views of producers, consumers and technologists and has related the standard to the manufacturing and trade practices followed in the country in thiJ field. Due -weightage bas also been f:ven. to. the need for .international co-ordination among standards prevailing U1 different countries of the world. 0.4 Wherever a reference to any Indian Standard appean in this specification, it shall be taken as a reference to iut.teat vernon. 0.5 Metric system hal been adopted in India and all quantities and dimensions in this standard have been given in this system. 3 lSI 2750· 1964 0-6 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis. shall be rounded off in accordance with IS: 2-1960 Rules for Roundin~ Off Numerical Value. (R,vis,d). The number of significant places retained in the rounded off value should be the same as that of the specified value 'in this standard. 0.·7 This standard is in ten ded chiefly to cover the technical provisions relating to steel scaffoldings, and it does not include all the necessary provisions of a con tract. 1. SCOPE 1.1 This standard lays down the requirements for materials, fabrication and performance of steel scaffoldings constructed with tubes, fittings and/or prefabricated frames, suitable for use in normal building construction work. 1.2 It does not include suspended or slung scaffoldings, 1.3 Scaffoldings constructed with material! other than steel are also not covered in this standard. 2.TERMlNOLOGY 2.0 For the purpose of this standard, the following definitions shall apply. 2.1 General 2.1.1 Design Load - Total load upon a tripod, trestle) unit frame which the supplier certifies that it can sustain with safety. This load shall ordinarily conform to the provisions as given in 5. 2.1.2 Purchaser - The penon receiving the assembled scaffold or separate components of scaffolds, whether by sale or on hire. 2.1.3 Supplier - The ~rson selling or hiring the assembled scaffold or separate components of scaffold. 2.2 Type. or Scaffolding 2.2.1 Independent Scaffold - The scaffolding supported on two rows of uprights, independent of the structure under construction. It may be either C individual component type' or ' unit frame type). NOTE - For tall buildings, the independent lCaR"oJdinl it tied 10 the structure at Iuitable intervals for additional stability. IS I 2750 · 1964 2.2.2 Individual Component Type Scaffold - Independent or putlog scaffold consisting of an assembly of individual tubes and fittings, 2.2.3 Putlog &affold - The scaffolding supported by 'single row of uprights in combination with load bearing parts of the structure. It may be either' individual component type' or ' unit frame type '. 2.2.4 Unit Frame Typ« Scaffold ~ Independent or putlog scaffold consisting of an assembly of prefabricated frames suitably connected fitted and used in combination with or without individual tubes. or 2.3 Individual Component. ;' 2.3.1 Base Piau raker. A plate for distributing the load from a standard or 2.3.2 Base Plate, Adjustable - A base plate embodying means of vertical adjustment. 2.3.3 Brace - A tube incorporated diagonally in a scaffolding for stability. 2.3.4 Bridle - A horizontal tube slung between putlogs for the purpose of supporting intermediate putlogs where due to window openings and me like, it is impossible to support a putlag in the wall. 2.3.5 Castor -,A swivelling wheel attached to the lower end ora tubular column for the purpose of moving and supporting scaffolding. 2.3.6 Coupler - A fitting by which a grip is applied to the external surfaces oftw() tubes and which thereby holds them together. 2.3.7 Coupler> Double ( Right Angled) - A coupler for connecting a tube at right angle, 2.3.8 Coupler Putlog - A non-load bearing coupler used for fixing a putlog or transom to a ledger. , 2.3.9 Coupler, Swivel- A coupler for connecting two tubes at any angle other than a righ tangle. 2.3.10 Joint Pin An internal fitting for jointing two tubes end-to-end. 2.3.11 Ledger - A tube spanning horizontally and tying a scaffold longitudinally, which may act as a support for putlogs .or transoms. 2.3.12 Puncheon - A vertical tube supported otherwise than upon the ground or upon a base plate. 2.3.13 Putlog - A tube or other member spanning from a ledger to the wall of a building and which may have a specially formed end (wh):h may be detachable) for the purpose offixing into the brickwork. 5 18 : 2750 · 1964 2.3.14 Putlog, Ancillary or IntnnudiIJt, - A tube or other member spanning from ledger to the wall of a building which may have an attached coupler for the purpose of securing such tube or member to a ledger and which may have a specially formed end (which may be detachable ) for the purpose of fixing into brickwork; and used between puilogs for the purpose of supporting scaffolding at positions and spacing required. 2.3.15 Putlog End - The specially formed end of a putlog. or a fitting for attaching to a tube, for locacing the member in a JOInt of a wall. 2.3.16 Raker - An inclined tube having a bearing on the ground or an adjacent structure. 2.3.17 Reveal Pin - A fitting used for tightening a reveal tie between two opposing surfaces. 2.3.18 Reveal Til - A tube which is jacked (wedged) between two opposing surfaces, for example, window reveal (opening) to tie a scaffold to a building. 2.3.19 Spigot - An alternative term for a joint pin [abo a part of a joint pin (set also 2.3.10) ]. 2.3.20 Ti,- A tube used to connect a scaffold to a reveal tie or other rigid anchorage. 2.3.21 Transom - A tube spanning aero" ledgers to tie a scaffold transversely and which may abo support a working platform. 2.3.22 Tub, - Tubing complying with the requirement of this standard. 2.3.23 Upright - A tube used as a vertical support or column in the construction of a scaffold and transmitting a load to the ground or a base plate. 2.4 ScafFolclJDsa Coaatructed with SuppordDI Members 2.4.0 In addition to the following-definitions, all definitions given in 2.3 shall also apply in the case of scaffoldings constructed widl supporting members excert that the word' tube' shall be substituted by 'tubular or steelstructura member '. 2,.4.1 Base Dimensions - Dimensions of the smallest rectangle enclosing the base of a tripod or trestle. "2.4.2 Beam A horizontal member supporting a vertical load. 2.4.3 Diagonal- A bracing member. 2.4:.4: Structural Sua Member - Structural steel section complying with the requirements of this standard. 6 IS J 2750 · 1964 2.4.5 Trestle - A self-supporting metal stand incorporating one or more horizontal beams on which a working platform may be laid. 2.4.6 Tripod - A self-supporting metal stand for suppcrting one end of a horizontal beam on which a working platform may be laid. 2.4.7 Unit Frame - A metal stand, not self-supporting, incorporating or supporting a platform or one or more horizontal beams on which a working platform may be laid. 3. TYPES 3.1 The various types of scaffolding shall be-as follows (see 2.2): a) Individual Component Type Putlog Scaffold, b) Unit Frame Type Putlog ,Scaffold, c) Individual Component Type Independent Scaffold, and d) Unit Frame Type Independent Scaffold, 3.1.1 Typical details of scaffoldings erected with fittings are shown in Fig. 1, 2 and 5 and typical erected with unit frames are shown in Fig. 3 and diagrammatic and are not intended to represent construction. individual tubes and details of scaffoldings 4. These figures arc standard methods of 4. MATERIALS 4.1 Steel Tube. 4.1.1 Steel tubes for individual component type scaffolding shall be heavy class welded or seamless tubes of 40 mm nominal bore conforming to -IS :1161-1963 Specification for Steel' Tubes for Structural Purposes ( Revised ). f.l.l.1 The following values for the'l'roperties of scaffolding tubes of 40 rom nominal bore are given below for Information: Cross-sectional area Moment of inertia Section modulus Radius of gyration A:2 5·57- em l I .. 13-77 Z IIC:I 5-70 em' K =- I-57 em K' -= 2·47 em' CID'} ( about a diametrafaxis ) 4.1.2 For other types of scaffoldings, the individual tube 01' tubes funning part of the unit frame shall conform to the requirements of IS : 1161-1963~ The sizes of such tubes shall be Cflverned by the design requirements stated in 5 and the minimum thickness .of metal for such tubes shall conform to 6.3 of*IS :8Q6.1957 Code of Practice for Use 'of Steel Tubes in General Building Construction. ·Since revised. 1 Q.U.tJlO 1l4lL ... ~ ... IHEIlIoECUoT[ CIt 4HCt. LAllY TllAHSOM COUI'tED 10 L.EOOERS WITH PuTLOG COU'lE1!S T~COUPl.ED '0 LEDGERS WIT11 POflOG couPlE IlS LEDGER COUP\.£O TO uPlliOHTS WITH POIIBLE COLPLEIl5 LONGITUDiNAl 0I460NAL AND CAOSS 8R4CES COVPlED TO UPlllGHTS WIT'"! $WWEL COUPlERS FlO" J TYPICAL SItr:TOH 0 ' I~DErENDE~T SCAFFOLD (I:-:Dl\"IDI'AL COIIIPOSEST Tv ss ) GIJARD Roll\. tNTE'lMEOIATE OR ANCillARY PUfLOG CouPLED TO LEDGEIl WITH PUTLOG CouPlER TIIo4BER SEATI/>fG , 'fLOG COUf'LED 10 LEOGER WITH PuTLOI) CouPlER LEDGfR COLFI.EQ TO UPRIGHTS WITH DOUBlE COUPLERS"~-----7~~--- LONGITUDINAl DIAGONAL eRACE CONNECTED TO uPRIGHTS WITH SWivEL COUPLERS eASE PLATE 1"1;. 2 T\'PIC~l. ShI:T' II '." Pt;11.'1(j SCAFfOI.D (l"OI\IDl'AJ. CO~II'l)):I"T Tv r'r: ) GuARD RAIL 7 ;:n=======~===~ l::=====~~==:::jl::::=:::l i · lEOOR SEClREO TO UNIT CROSS BAR LONGIT UOHIIAL DIAGONAL BRACE. UNIT TYP£ UNIT VERTICALS fIG. 3 TYPfCAL SKETCH 0 ' I~DEPgSDENT SCAFFOLD ( L!SIT FRAlolY. TYPE) GUAAO RAl TOE BOAIlO INTERMEOlATf OR ANCIlLAFrf PUTLOG ~ "\ ~r-::: '~~ "'- ~ ··;·:·~I SCAFFOLD BOARDS I FlO. 4 TYPICAL SKItTeR Or PUTLOO SCUroLD (UKIT FBAMJ: TnB) i f I) I ! PlAN THROUGH WINOOW PLAN THROUGH WINDOW TIE C::-' ',1"1" . ; ""'-.TlMtIER Y"""l:=::!::===:}II SECTION VV 5B $U~ ,--, P... ST \VINDOW - ~~_ "-.onAL SECTION XX l"lN SA SA and SB Methods of Tying in Window Opening TYING IN ... NO BxIOLING FlO. 5 TYPIC... L Dz-r ... ILS or ContJ zr---- 1512750 -1964 ~---'-~~~ '.:----'~- "e - - ... ---", BRIOLE COUPLED TO OUTER PUTLOGS WITH DOUBLE bcJ==::(l~t==:(]Jc-- £", -II'\..... .... -==::0 1Jl0=~ COUPL~RS 0.' d ; PLAN THROUGH WINDOW, ~AOO1TIONAl PUTLOG COUPLED TO ~RIOlE WITH PUTLOG COUPLER ,\PUTLOG SECTION ZZ PUTLOG SCAFFOLD 5C FlO. 5 Bridling to Pass Window Opening TYPICAL DJl:TAILB or TYING 11'1 AND BaIDLING PAST WINDOW 4.2 St~1 Fittin~s - All fittings shall be manufactured from steel which when analyzed III accordance,with*IS:228-1959 Methods of Chemical Analysis of Pig Iron, Cast Iron and Plain Carbon and Low-Alloy Steels ( Revised) shall show not more than 0'06 percent of sulphur and no; more than 0'06 percent of phosphorus, and shall also conform to grade CIS or C20 of IS: 1570-1961 Schedules for Wrought Steels for General Engineering Purposes. 4.3 Steel Sections, Bars and Rivets 4.3.1 Steel sectio~s and bars shall conform tot lS: 226-1962 Speci.i.ation for Structural Steel ( Standard Quality) ( Third Revision). Ban for Structural Purposes. 4,3.2 Rivet bars shall conform to~I&' 148-1957 Specification fOI Rivet f Fiflh revision in J97.~ i%lnce reviled and .plli"into pam lSccond revision in 1973 13 III 2750 · 1964 4.4 Boh. aDd ~lIt. - Hexagonal, square and round head bolts and nuts shall be of mild steel and shall conform to the requirements t 3621962 Dimension! for Screw Threads for General Purposes (Diameter Range 1·6 to 39 rom) (&viJtd), atldtli 1367-1961 Technical Supply Conditions for Threaded Fasteners; and other relevant Indian Standards. ons: 5. DESIGN CRITERIA 5.1 General 5.1.1 All types of scaffoldings shall be capable of carrying and transmitring to the ground, all resultant loads by themselves or jointly with load carrying parts of the building, which have achieved adequate strength for this purpose. The loadings on die scaffoldings shall comply with the appropriate requirements of relevant Indian Standards regarding loading on temporary structures and scaffoldings. All scaffoldings shall be adequately stiffened, both longitudinal ly and transversely to take up horizontal loading due to wind pressure on the scaffolding or tensioning ropes, if any, or both; and the forces resulting from inclined supports or support derived from the parts of a structurally stable building, lifung tackle, etc. The scaffolding! shall be adequately rigid at all stages of erection and dismantling. 5.1.2 Where the supports cannot be fixed vertically due to any reason, the eccentricity of the loading so carried should also be taken into account. The braces should be designed to carry, in addition to any applied horizontal loads, and the horizontal loads induced by the non-vertical supports, an additional horizontal load equal to 1/100 of the vertical loads carried by each platform and applied on its upper surface, and ~/lOO of vertical loads carried by the ground applied at the base of scaffolding. 5.2 The permissible stresses and other design considerations shall comply with the appropriate requirements of relevant Indian Standards on structural design" of tubular steel scaffolding. 6. S1J'?PLIER'S CERTIFICATE 6.1 The supplier shall, when required, furnish the purchaser a certificate that the tubes, fittings and prefabricated frames com~ly in all respects with the requirements of this standard. If used tubes, fittings and prefabricated frames are supplied, the supplier shall, if required) furnish the purchaser a certificate that these component! are in satisfactory condition and were originally manufactured as per requirements of this standard. 6.2 The manufacturer or supplier shall also produce sufficient evidence (eitht.r calculations or test data) in f~,lfilment of the design criteria ( see 5.1 and 5.2). In all cases) the manuracturer. or supplier shall furnish .~In~e withdrawn. t~ince r~vi~. 14 IS I 2750 · 1964 and wherever possible suitably exhibit on the components of the scaffolding the following particulars: a) Design load which may be imposed on the scaffolding as a whole, and the distribution of this load upon which the design of trestles, tripods or unit frames is based; b) Limitations of height, width or breadth in any direction, with or without supports derived from the structure; c) Maximum distance to which the 'scaffolding can be extended beyond a given dimension in any direction, and the type of support required for the purpose; and d) Any other restrictions on. the usage or transportation of scaffoldings, fittings, prefabricated frames and components. 7. COMPONENTS OF SCAFFOLDING 7.1 Various components for independent as well as putlog scaffolds shall be so designed and manufactured that the scaffolding erected with them gives satisfactory performance and fulfils the requirements laid down in 5. 7.2 Steel Tubes in 4.1 7.3 Steel Fittings The tubes shall conform to the requirements given 7.3.1 All fittings shall be free from flaws or other defects. They shall be so designed that when fixed in the normal manner for service as a part of scaffold) they cannot be loosened or rendered unsafe under normal use by a casual or accidental blow, or by movement of traffic upon the scaffold. 7.3.2 All fittings shall be so designed that, when assembled, but before being tightened, no part of the scaffold can become detached by accident. 7.3.3 In addition to the requirements specified in 7.3.1 and 7.3.2, the fittings shall comply with the tests and other requirements for individual fittings as specified in 7.3.4 to 7.3.12. 7.3.3.1 If the fittings are supplied as being suitable for particular type of tubes (,welded or seamless), they shall be tested on tubes of that particular type. 7.3.3.2 For the purpose of the tests, the fittings shall be such as can be fixed without undue effort. by means of the tool normally supplied for the particular type of fitting. 7.3.3.3 The fittings shall be capable of passing the necessary tests without damage which would render the fittings, or the tube or tubes, \vith which they are tested, unserviceable for further use in scaffolding. 15 ]8 · 2750 -I"" 1.3.· lOglal-.A.ngltd Couplers 7.3··· 1 A right-angled coupler shall be so designed and constructed that it will pass the test (a) for distortion and either rotation test (b) or slip test (c) whichever is selected by the manufacturer. a) Distortion test - The coupler, connecting two tubes at right angle and suitably prevented from slipping on the vertical tube (It, Fig. 6) shall be capable of supporting without distortion, a load of 3 tonnes applied to the horizontal tube. TUBE RIGIDLY SECURED AT THIS POINT TEST LOAD __ ...1.-.fF~. --_.- ~ ---SUPPORT TO COUPLER TUBE RIGIDLY SECURED AT THIS POINT FIG. 6 TnT J'Oa DI8TOaTIOH or COUPL'Ia b) Rotation test - The coupler, fitted to a ledger which is rigidly restrained from axial rotation shall have a tube fitted horizontally as a cantilever at right angle to the ledger and ofa length suitable to obtain leverage of approximately 1'2 m (see Fig. 7). A load applied to the cantilever shall be increased in increment until the turning moment exerted exceeds 3 220 kgem. Alternatively, a fixed load may be used increasing the turning moment by moving the load along the cantilever. Throughout the test the deflection 16 IS I 2750 · 1964 of the end of the tube from the horizontal shall not exceed onequarter of the length of the lever arm. r APPROX 1200 0_ mm 1 - - ] -=.- ~ ~ __---_:- .. - J -----+-r ~ TEST LOAD TUBE RESTRAINED FROM ROTATION FlO. 7 TEAT roa ROTATION O~ ColJPLJ:B c) Slip lesl- The coupler, connecting two tubes at right angles (see Fig. ~) shall be capable of supporting, without vertical slip and without distortion, a load of 1'25 tonnes applied to the horizontal tube. During this test the coupler shall not rotate through an angle exceeding 10° from the horizontal. TEST LOAD FlO. 8 TaT:I'O. SLU 01' COtrPLlCB 7.3.4.2 In canying out the tests stipulated in 7.3.4.1, th; coupler shall be tested with each gripping surface in tum subjected to distortion, rotation and slip respectively, and with the test load applied successively in reverse directions for each coupler position. 7.3.5 Swivel Coupler 7.3.5.1 The swivel- coupler shall be designed and constructed so that the swivel faces are smooth and in sufficiently close contact to prevent the connecting pin being subjected to bending stresses. This requirement, 17 IS: 2750 - 1964 however, shall not prohibit a washer of adequate bearing area heing interposed between the faces of the coupler, provided it is an exact fit on the pin and the coupler is not rendered less efficient by the use of the washer. The pin connecting the t\VO parts of a swivel coupler shall be of steel and not less than 16 mm in diameter. The swivel coupler shall be capable of passing the folowing tests: a) Distortion lest ~ The coupler, connecting two tubes at right angles and suitably prevented from slipping on the vertical tubes, ( see Fig. 6 ) shall be capable of supporting without distortion a load of 1'5 tonnes, b) Slip test - The coupler, connecting two tubes at right angles ( see Fig. 8 ) shall be capable of supporting, without vertical slip and without distortion, a load of 1'25 tonnes applied to the horizontal tube. During this test the coupler shall no" rotate through an angle greater than 10° from the horizontal. 7.3.5.2 In carrying out the tests stipulated in 7.3-.5.1) the coupler shall be tested with each gripping surface turn subjected to distortion and slip respectively, and with the test load applied successively in reverse directions for each coupler position. in 7.3.6 Putlog Couplers - The grip afforded by a single coupler which may be attached to intermediate or ancillary putlogs shall offer adequate resistance to horizontal or axial rotation, slip or accidental displacement of a putlog. NOT. - A putlog coupler, not capable of 5atisfyin~ the test requirement for rightangled coupler. shall be of such a shape as to be readily distinguishable from a right. angled coupler. 7.3.7 Joint Pin.r 7.3.7.1 The joint pin shall be self-centring so that in both the tubes which it connects, an equal length of pin shall engage with each of the tubes. This requirement shall ~ achieved by means of an annular projection e ncircling the joint pin at the mid-point. This projection shall provide an even bearing surface for the end of any tube which has been cut cleanly and squarely and which otherwise complies 'with this standard. The bearing surface shall not, under normal loading, tend to bulge or-otherwise distort the end of any tube with which it 15 in contact. 7.3.7.2 Each spigot of the joint pin shall extend not less than 75 rom on the internal surface of any tube which conforms to this standard and shall provide an effective bearing area. Each spigot shall be capable of being expanded within a tube with which it is engaged so as to provide an adequate gnp between the tube ~nd the joint pin unless, the joint pin is so designed that, when fully engaged t9 connect two tubes, it Is not possible to disconnect either tube from the joint pin without one complete axial rotation of the tube relative so the joint pin. 18 18 : 2750 - 1964 1.3.7.3 The net cross-sectional area of the joint pin shall not be Iess than 80 percent of that of a steel tube conforming to this standard. Non - Join t pins are not intended for we in position where they will be subject to the bending stresses or ax.ial tension. 7.3.8 Reveal Pin 7.3.8.1 The end of the reveal pin remote from the tube shall provide a bearing surface perpendicular to and concentric with its axis and, having a minimum width of 48 mm, 7.3.8.2 The means for varying the distance between the surface bearing against the end of a tube and the end of the reveal pin shall enable adjustments of this distance to be made readily, smoothly and with infinite variation within the limits of adjustment of the reveal pin. 7.3.8.3 The design of the adjustable portion of the reveal pin shall be such that, when under load, the adjustment cannot ~ altered by the action of load or by vibration. 7.3.8.4 The reveal pin shall be capable of passing the following test: A tube of 2 m length conforming to the requirements of this standard and fitted with the reveal pin shall be placed horizontally, so that it is supported solely by the frictional grip exerted upon the smooth, parallel and vertical faces of two abutments by the bearing surface of the reveal pin and the end of the tube respectively. Timber or other suitable packing material may be used agai~t the faces of the abutments.· A load of 250 kg shall be applied to the tube midway between the abutments and central deflection measured, The deflections under load with the reveal pin extended to within 2-5 em of its full working length shall not exceed twice the deflection under the same load with the reveal pin closed to within 2·5 ern of its minimum length. During the test no slip shall occur between the tube or reveal pin and the abutment faces. No permanent set, distortion or other damage shall occur which will render the tube or reveal pin unserviceable for further we in scaffolding. 7.3.9 Putlogs - The putlogs shall either be constructed from tube conforming to the requirements given in 3.1.1 or be so designed and constructed as to provide at least equivalent resistance to bending. shear and deflection, A fitting other than a putlog coupler provided for connecting a putlog to a tube shall comply with the requirements of 7.3.6 for putlog couplers. 7.3.10 Putlog Ends 7.3.10.1 A putlog end shall have an even bearing surface at least 7·5 em long and at least 5 em wide, measured from the end of the tube. ' .. 3 .10.2 Putlog end! shall be considered' to be subject to bending, bearing or shear stresses only and Jhall Dot be required to transmit axial 19 IS: 2750·1964 pulls or thrusts. Detachable putlog ends shall be I?rovided with means of securing them to the putlog without risk of'being accidentally disconnected. 7.3.10.3 A putlog end, when attached to or forming part of a putlog and supported only within 38 rom of its extremity (su Fig. 9) shall be capable of supporting without permanent set or other distortion, a maximum distributed load of 455 kg over a 'Fan of 120 em. 38 mm 38mm -.....----1200 mm-----kl.." FlO. 9 TEST 1'0. B&NDING PI.1TWG Er