1、July 2007DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.220!,z2y“9871586www.din
2、.deDDIN EN 74-3Couplers, spigot pins and baseplates for use in falsework andscaffolds Part 3: Plain base plates and spigot pins Requirements and test proceduresEnglish version of DIN EN 74-3:2007-07Kupplungen, Zentrierbolzen und Fuplatten fr Arbeitsgerste und Traggerste Teil 3: Ebene Fuplatten und Z
3、entrierbolzen Anforderungen und PrfverfahrenEnglische Fassung DIN EN 74-3:2007-07supersedesDIN EN 74:1988-12www.beuth.deDocument comprises 13 pages 74-1:2005-12,Together with DIN EN09.07DIN EN 74-3:2007-07 2 National foreword This standard has been prepared by CEN/TC 53 “Temporary works equipment” (
4、Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Technical Committee 11.05.00 Arbeits- und Schutzgerste und Gerstbauteile. Amendments This standard differs from DIN EN 74:1988-12
5、 as follows: a) The specifications for baseplates and spigot pins have been revised to reflect the latest state of the art. b) Couplers are now covered in DIN EN 74-1:2005-12. Previous editions DIN ISO 4054: 1981-05 DIN EN 74: 1988-12 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 74-3April 2007I
6、CS 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 -Requirements and test proceduresRaccords, goujons dassemblages et semailles pourtaiement et chafaudages de service - Partie 3: Semellespl
7、anes et goujons - Exigences de performances et mthodedessaiKupplungen, Zentrierbolzen und Fuplatten frArbeitsgerste und Traggerste - Teil 3: Ebene Fuplattenund Zentrierbolzen - Anforderungen und PrfverfahrenThis European Standard was approved by CEN on 15 March 2007.CEN members are bound to comply w
8、ith the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Ce
9、ntre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial
10、 versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia,
11、 Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national
12、Members.Ref. No. EN 74-3:2007: EEN 74-3:2007 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .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
13、 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 be recorded .10 8.6 Evaluation of test results 10 9 Designation 11 10 Marking .11 11 Test report and test certification11 12 Product manual11 EN 74-3:2
14、007 (E) 3 Foreword This document (EN 74-3:2007) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the secretariat 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 endorseme
15、nt, at the latest by October 2007, and conflicting national standards shall be withdrawn at the latest by October 2007. This document together with EN 74-1:2005 supersedes EN 74:1988. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries a
16、re bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swe
17、den, Switzerland and United Kingdom. EN 74-3:2007 (E) 4 Introduction EN 74, “Couplers, spigot pins and base plates for use 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
18、 Part 3 Plain base plates and spigot pins Requirements and test procedures EN 74-3:2007 (E) 5 1 Scope EN 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.
19、A base plate with a means of limited vertical adjustment, called a “base jack”, is dealt with in EN 12811-1. 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 th
20、e application of this document. For dated references, only the edition cited applies. For undated references, 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
21、 tubes - Requirements and test procedures EN 12811-1:2003, Temporary works equipment - Part 1: Scaffolds 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,
22、 Sampling procedures for inspection by attributes - Part 10: Introduction to the ISO 2859 series of standards 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
23、the following apply. 3.1 plain base plate (BP) stiff base flat or deformed with a centring device for locating a tube for spreading the force (see Figure 1) EN 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 t
24、ubes coaxially to transmit compressive forces (see Figure 2) Figure 2 Examples of loose spigot 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
25、 the spigot in kN; P1test force applied to the tube placed over the spigot in kN; r radius of an inscribed circle; C2identification of a corrosion protection type; Ppinitial force applied to form a reference level in kN. EN 74-3:2007 (E) 7 5 Requirements for structural properties There are no classe
26、s for either base plates or loose spigots. There is a stiffness requirement 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 require
27、ments 7.1 Materials Requirements for ferrous materials are given in EN 74-1; 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 wit
28、h EN 12811-2. Electrolytical zinc coating C2shall have an average thickness 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 devi
29、ce. They are for use as supports for tubes with an external diameter of 48,3 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
30、 tube in radial direction may not be more than 11 mm in any radial direction, 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 po
31、lygonal. The radius r of the inscribed circle shall be between 70 and 80 mm. EN 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 robust
32、ness. Flat steel plates of minimum grade S235 with a minimum 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-dis
33、placement curve equal or better than given in Figure 4 when 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 applie
34、s to all samples tested. The plate shall be placed on a circular 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. EN 74-3:2007 (E) 9
35、 7.2.3 Loose spigot (LS) A loose spigot (see 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
36、,0 mm and 47,8 mm. The body sides shall be parallel 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
37、.2.4 Manufacturers drawings In respect of each 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)
38、 dimensions and tolerances; b) mass with tolerance; 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
39、 that they comply with the manufacturers drawings. 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
40、 Test equipment shall have an accuracy of 1 %. 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 Figur
41、e 5. The displacements may be measured from the movement of the reference tube. EN 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 subje
42、cted to an increasing load P1. 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.
43、 For definition of symbols see 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 resu
44、lts Statistical evaluation is not required. EN 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
45、 a base plate conforming 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
46、mm. Fittings shall 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 ” dur
47、ing 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 carried out by a person or organization different from the o
48、riginal designing person or organization. 12 Product manual The manufacturer of a fitting shall produce a set of instructions forming the product manual. This manual shall comprise at least the following: description and a drawing from which the component can be identified; identity of the assessor; instructions for using fittings; statement regarding damaged fittings; declaration of conformity with EN 74-3 made by the manufacturer.
