1、BS EN 74-3:2007ICS 91.220NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDCouplers, spigot pinsand baseplates foruse in falsework andscaffoldsPart 3: Plain base plates and spigotpins Requirements and testproceduresThis British Standard was published under the aut
2、hority of the Standards Policy and Strategy Committee on 30 June 2010 BSI 2010ISBN 978 0 580 56237 2Amendments/corrigenda issued since publicationDate CommentsBS EN 74-3:2007National forewordThis British Standard is the UK implementation of EN 74-3:2007.The UK participation in its preparation was en
3、trusted by Technical Committee B/514, Access and support equipment, to Subcommittee B/514/21, Access and working scaffolds and their components (props, tubes and couplers).A list of organizations represented on this committee can be obtained on request to its secretary.The EN 74 series is in three p
4、arts which together replace EN 74:1988. EN 74:1988 was implemented in the UK as BS 1139-2.1:1991, but was withdrawn on the UK implementation of EN 74-1:2005.BS EN 74 Couplers, spigot pins and baseplates for use in falsework and scaffolds consists of the following parts:Part 1 (2005) Couplers for tub
5、es - Requirements and test proceduresPart 2 (2008) Special couplers - Requirements and test proceduresPart 3 (2007) Plain base plates and spigot pins - Requirements and test proceduresThe UK Subcommittee is preparing a National Application Document (NAD) to help users in the application of the EN 74
6、 series. Any com-ments on the use of this part, or of the others in the series, or errors that are identified in the text should be notified to the B/514 Committee Secretary, BSI, 389 Chiswick High Road, London W4 4AL so that they can be taken into account in developing the NAD.Additional informatio
7、nFor other couplers used in the UK, but not included in BS EN 74-2 or BS EN 74-3, further information may be found in BS 1139-2.2:2009.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British
8、Standard cannot confer immunity from legal obligations.BS EN 74-3:2007EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 74-3April 2007ICS 91.220 Supersedes EN 74:1988 English VersionCouplers, spigot pins and baseplates for use in falsework andscaffolds - Part 3: Plain base plates and spigot pins -Re
9、quirements and test proceduresRaccords, goujons dassemblages et semailles pourtaiement et chafaudages de service - Partie 3: Semellesplanes et goujons - Exigences de performances et mthodedessaiKupplungen, Zentrierbolzen und Fuplatten frArbeitsgerste und Traggerste - Teil 3: Ebene Fuplattenund Zentr
10、ierbolzen - Anforderungen und PrfverfahrenThis European Standard was approved by CEN on 15 March 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up
11、-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunde
12、r the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hun
13、gary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: r
14、ue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 74-3:2007: EBS EN 74-3:2007EN 74-3:2007 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions
15、.5 4 Symbols 6 5 Requirements for structural properties.7 6 Reference tube.7 7 General requirements7 7.1 Materials .7 7.2 Design .7 7.3 Production 9 8 Test method and evaluation of results for a base plate 9 8.1 General9 8.2 Purpose of test.9 8.3 Arrangement of test.9 8.4 Test method10 8.5 Data to b
16、e recorded .10 8.6 Evaluation of test results 10 9 Designation 11 10 Marking .11 11 Test report and test certification11 12 Product manual11 BS EN 74-3:2007EN 74-3:2007 (E) 3 Foreword This document (EN 74-3:2007) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the sec
17、retariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2007, and conflicting national standards shall be withdrawn at the latest by October 2007. This document t
18、ogether with EN 74-1:2005 supersedes EN 74:1988. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Ge
19、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 74-3:2007EN 74-3:2007 (E) 4 Introduction EN 74, “Couplers, spigot pins and base plates for u
20、se in falsework and scaffolds”, consists of the following parts: Part 1 Couplers for tubes Requirements and test procedures Part 2 Special couplers Requirements and test procedures Part 3 Plain base plates and spigot pins Requirements and test procedures BS EN 74-3:2007EN 74-3:2007 (E) 5 1 Scope EN
21、74-3 specifies for plain and profiled base plates and loose spigots to be used with 48,3 mm diameter tubes in scaffolds and falsework: materials; design requirements; test procedure; assessment. A base plate with a means of limited vertical adjustment, called a “base jack”, is dealt with in EN 12811
22、-1. NOTE In the text of this standard, the term “loose spigot” is used instead of the “spigot pin” in the title. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated referen
23、ces, the latest edition of the referenced document (including any amendments) applies. EN 74-1:2005, Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures EN 12811-1:2003, Temporary works equipment - Part 1: Scaffolds
24、Performance requirements and general design EN 12811-2:2004, Temporary works equipment - Part 2: Information on materials EN 12811-3, Temporary works equipment - Part 3: Load testing ISO 2859-10, Sampling procedures for inspection by attributes - Part 10: Introduction to the ISO 2859 series of stand
25、ards for sampling for inspection by attributes 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 74-1:2005, in EN 12811-1:2003, EN 12811-2:2004 and the following apply. 3.1 plain base plate (BP) stiff base flat or deformed with a centring device for loc
26、ating a tube for spreading the force (see Figure 1) BS EN 74-3:2007EN 74-3:2007 (E) 6 Figure 1 Typical example of a base plate with a flat plate 3.2 loose spigot (LS) fitting using internally for locating two tubes coaxially to transmit compressive forces (see Figure 2) Figure 2 Examples of loose sp
27、igot 4 Symbols For the purposes of this document, the following symbols apply: f displacement blow the periphery of the tube which applies the force in mm (see Figure 5); P force applied to the tube placed over the spigot in kN; P1test force applied to the tube placed over the spigot in kN; r radius
28、 of an inscribed circle; C2identification of a corrosion protection type; Ppinitial force applied to form a reference level in kN. BS EN 74-3:2007EN 74-3:2007 (E) 7 5 Requirements for structural properties There are no classes for either base plates or loose spigots. There is a stiffness requirement
29、 for base plates but there are no structural requirements for loose spigots. 6 Reference tube The reference tube used in testing shall meet the requirements for type RTS2specified in Table 7 of EN 74-1:2005. 7 General requirements 7.1 Materials Requirements for ferrous materials are given in EN 74-1
30、; in addition, aluminium alloys may be used; EN 12811- 2 gives information on a number of frequently used materials. Base plates and loose spigots shall be protected against atmospheric corrosion, in general in accordance with EN 12811-2. Electrolytical zinc coating C2shall have an average thickness
31、 of 15 m. 7.2 Design 7.2.1 General This standard does not specify any structural requirements for loose spigots. 7.2.2 Base plate (BP) 7.2.2.1 Plain base plates Base plates consist of two elements, a plate and a centring device. They are for use as supports for tubes with an external diameter of 48,
32、3 mm. 7.2.2.2 Geometrical requirements Each base plate shall have a circular or polygonal base. The centring device shall have a minimum length of 50 mm. For a reference tube placed on the base plate, the free movement of the tube in radial direction may not be more than 11 mm in any radial directio
33、n, whereby the nominal dimensions may be taken as the basis and the reference tube has a diameter of 48,3 mm and a thickness of 2,7 mm (see Figure 3). The plate shall be at least doubly symmetrical and shall be circular or polygonal. The radius r of the inscribed circle shall be between 70 and 80 mm
34、. BS EN 74-3:2007EN 74-3:2007 (E) 8 Dimensions in millimetres Key 1 reference tube Figure 3 Maximum play between the reference tube and the centring device 7.2.2.3 Structural requirements The plate shall have sufficient stiffness and robustness. Flat steel plates of minimum grade S235 with a minimum
35、 thickness of 5 mm and aluminium alloy plates with a proof stress of 195 N/mm2with a minimum thickness of 7 mm are deemed to satisfy this requirement. Figure 4 Force-displacement curve of a plate Other profiled plates shall have a force-displacement curve equal or better than given in Figure 4 when
36、calculated or tested in accordance with the arrangement of Figure 5. When loaded until a load of P = 30 kN in accordance with Clause 8, no central deflection f shall exceed that in the force-displacement curve given in Figure 4. This applies to all samples tested. The plate shall be placed on a circ
37、ular support. The force shall be applied centrally on the tube. The displacement of the tube may be taken as the required displacement. NOTE The arrangements provided in Figure 5 are only provided for comparison purposes. BS EN 74-3:2007EN 74-3:2007 (E) 9 7.2.3 Loose spigot (LS) A loose spigot (see
38、3.2) shall have a central collar and end projections so that it can extend at least 75 mm into the tubes on both sides of the collar. A collar shall have a flat contact surface with the end of each tube. The outside diameter of collars shall be between 47,0 mm and 47,8 mm. The body sides shall be pa
39、rallel and of outside diameter not greater than 37,5 mm and not less than 35,0 mm, with the exception of cruciform shaped loose spigots which may have a maximum width of 38,7 mm. The collar and spigot axes shall be concentric with a tolerance of 1,0 mm. 7.2.4 Manufacturers drawings In respect of eac
40、h component design, the manufacturer shall make available drawings containing sufficient information to enable identification and inspection to be carried out. These shall be kept available for this purpose. The following information shall be included: a) dimensions and tolerances; b) mass with tole
41、rance; c) material specification for each element; d) type of corrosion protection of each element. 7.3 Production An appropriate method of control during a production programme shall ensure that components conform to the requirements of this standard and that they comply with the manufacturers draw
42、ings. 8 Test method and evaluation of results for a base plate 8.1 General 8.1.1 At least three tests shall be carried. 8.1.2 The samples required for testing shall be randomly selected (see ISO 2859-10) from out of a batch of at least 500 fittings. 8.1.3 Test equipment shall have an accuracy of 1 %
43、. 8.2 Purpose of test The test establishes the force-displacement curve of a base plate. 8.3 Arrangement of test The plate shall be placed on a circular support. The force, P1, shall be applied centrally to the tube. The test arrangement is shown in Figure 5. The displacements may be measured from t
44、he movement of the reference tube. BS EN 74-3:2007EN 74-3:2007 (E) 10 Dimensions in millimetres Figure 5 Test arrangement for a base plate 8.4 Test method Apply a preload PPof 0,3 kN to establish the zero for displacement measurements. The base plate shall then be subjected to an increasing load P1.
45、 The test load Pishall be increased uniformly at a rate not exceeding 0,1 kN per second and the rate of displacement shall not exceed 1,0 mm per minute. Increase the load until either: the load, P1, reaches 30 kN; or the displacement f (central deflection) reaches 5 mm. For definition of symbols see
46、 clause 4. 8.5 Data to be recorded Force-displacement curves for Piand f shall be plotted similar to Figure 4. The plotted force-displacement curves shall include at least one displacement measuring point for every 1,0 kN increase in load P1. 8.6 Evaluation of test results Statistical evaluation is
47、not required. BS EN 74-3:2007EN 74-3:2007 (E) 11 9 Designation For each fitting, a designation shall be established as follows: Type of fitting: BP or LS Method of corrosion protection in accordance with 7.1. Example of designation: EN 74-3 BP C2The example shown is the designation of a base plate c
48、onforming to EN 74-3 with corrosion protection type C2. 10 Marking The marking shall be impressed or embossed on the fitting and shall be legible after the protective coating has been applied. The height of the characters shall be at least 4,0 mm and their depth shall be at least 0,2 mm. Fittings sh
49、all be marked in one or two lines with the following information, in the sequence given: EN 74-3; name or trademark of the manufacturer; year of manufacture (last two digits only). Example of marking EN 74 XX 06 This example is for a base plate or a loose spigot produced by “ XX ” during 2006. 11 Test report and test certification 11.1 The test report and test certification, if required, shall comply with the requirements specified in EN 12811-3. 11.2 For evaluation of test results see 8.6. 11.3 The assessment shall be carrie
