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1、DRAFT FOR DEVELOPMENT DD ENV 14464:2002 Incorporating Corrigendum No. 1 Sawn timber Method for assessment of case-hardening ICS 79.040 ? Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ENV 14464:2002 This Dr
2、aft for Development was published under the authority of the Standards Policy and Strategy Committee on 1 May 2003 BSI 28 May 2003 ISBN 0 580 41635 6 National foreword This Draft for Development is the official English language version of ENV 14464:2002. This publication is not to be regarded as a B
3、ritish Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature because it is considered that further experience is required in its application before it is converted into a British Standard. It should be applied on this provisional basis, so th
4、at information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion to a European standard. A review of this publication
5、 will be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its 3-year life. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the rep
6、lies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the prestandard or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee B/543, Round an
7、d sawn timber, at British Standards House, 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. A list of organizations represented on this committee can be obtained on request to its secretary. Cro
8、ss-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of
9、 British Standards Online. Summary of pages This document comprises a front cover, an inside front cover, the ENV title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since pu
10、blication Amd. No. DateComments 14508 Corrigendum No. 1 28 May 2003Quality of diagrams improved Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN PRESTANDARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 1446
11、4 November 2002 ICS 79.040 English version Sawn timber - Method for assessment of case-hardening Bois scis - Mthode de mesure de la cmentationSchnittholz - Verfahren zur Ermittlung der Verschalung This European Prestandard (ENV) was approved by CEN on 23 September 2002 as a prospective standard for
12、provisional application. The period of validity of this ENV is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the ENV can be converted into a European Standard. CEN members are required to announce
13、 the existence of this ENV in the same way as for an EN and to make the ENV available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into a
14、n EN is reached. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZAT
15、ION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. ENV 14464:2002 E Licensed Copy: London South Bank University,
16、 London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 14464:2002 (E) 2 Contents Foreword3 1Scope 3 2Normative references 3 3Terms and definitions3 4Slicing test method3 4.1Apparatus .3 4.1.1Calibrated measuring device3 4.1.2Jig4 4.1.3Slicing device.4 4.2Pr
17、ocedure .4 4.3Calculation and expression of the result 6 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 14464:2002 (E) 3 Foreword This document ENV 14464:2002 has been prepared by Technical Committee CEN /
18、TC 175, “Round and sawn timber“, the secretariat of which is held by AFNOR. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this European Prestandard : Austria, Belgium, Czech Republic, Denmark, Finland, France,
19、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope This European Prestandard defines a destructive method of assessing the case-hardening of a piece of sawn timber with reference to the distortion me
20、asured in a slice taken from the piece. This European Prestandard is applicable to sawn timber and timber which has been planed or surfaced by other means. It applies to both hardwood and softwood with a thickness not greater than 100 mm. 2 Normative references This European Prestandard incorporates
21、 by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European P
22、restandard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 844 series, Round and sawn timber Terminology . 3 Terms and definitions For the purposes of this European Prestandard the term
23、s and definitions given in EN 844-1 to EN 844-12 and the following apply. 3.1 conditioning additional treatment after a drying process, during which the possible case-hardening is reduced by re-wetting the surface layers of the timber by means of elevated relative humidity and temperature 4 Slicing
24、test method 4.1 Apparatus 4.1.1 Calibrated measuring device Calibrated measuring device graduated in at least 0,1 mm steps. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 14464:2002 (E) 4 4.1.2 Jig Jig as
25、shown in Figure 1. Dimensions in millimetres Figure 1 Test jig for assessment of case-hardening 4.1.3 Slicing device Band saw or circular saw to cut a cross section from a piece of sawn timber. Sharp knife or saw to divide the test slice into two equal parts. 4.2 Procedure Saw a test slice, full cro
26、ss section with 15 mm length taken in the direction of the grain at least 300 mm from either end of the piece of timber or at mid-point of pieces less than 600 mm long, according to Figure 2. 25 100 10 75 AA A - A Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12
27、05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 14464:2002 (E) 5 Dimensions in millimetres Figure 2 Preparation of test slice The test slice shall be clean and free from features such as bark, knots, resin pockets and reaction wood. Resin wood shall be avoided. If defects exist, cut the test
28、 slice from the nearest defect free area towards the centre of the piece of timber. Divide the test slice into two equal parts parallel to the face of the piece of sawn timber from which the test slice has been taken. Mark the two parts, as shown in Figure 3, in such a way that the two parts can be
29、placed on top of each other again in its original position. Figure 3 Division and marking of test slice Place the two parts of the test slice in a plastic bag and seal it. Keep at room temperature for 24 h for softwood test slices, 48 h for hardwood test slices in order to equalise the moisture grad
30、ient. At the end of this period remove the two parts from the bag and place them centred on the test jig, as shown in Figure 4. 15 300 11a 11b Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 14464:2002 (E)
31、6 Figure 4 Evaluation of case-hardening with test jig If the width of the piece of sawn timber and of the corresponding test slice is between 75 mm and 100 mm, place the two parts centred across the test jig pins that are at 75 mm pitch. Measure the distance between the two test pieces at mid-point,
32、 with an accuracy of 0,1 mm. 4.3 Calculation and expression of the result From the measured value subtract the diameter of the test jig pins. Measured values resulting from the test jig with 75 mm pin distance shall be multiplied by a factor of 1,78. The result may be a positive or negative number.
33、A - A AA Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ENV 14464:20
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