1、- STD-BSI BS EN L3Lb-3-ENGL 1998 Lb24bb9 Ob88757 Ob7 H BRITISH STANDARD Hardwood round timber - Qualitative classification Part 3. Ash and maples and sycamore The European Standard EN 13163 : 1997 has the status of a British Standard ICs 79.040 BS EN 1316-3 : 1998 NO COPYING WITHOUT BSI PERMISSION E
2、XCEPT AS PERMITTED BY COPYRIGHT LAW _ STD=BSI BS EN 13Lb-3-ENGL 1798 D lb24bb7 Ob88758 TT3 AmdNo. BS EN 13163 : 1998 Date nxt affected This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was pubiished under the authority of the Stan
3、dards Board and comes into effect on 16 March 1998 Q BSI 1998 National foreword This British Standard is the English anguage version of EN 131M : 1997. No existing British standard is supersedea The UK participation in its preparation was entrusted by Technical Committee BH3, Round and sawn timber,
4、to Subcommittee B/ - monitor related international and European developments and promulgate themintheuK. A list of organizalions represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications re
5、ferred to in this document may be found in the BSI Standards Catalogue under the section entitied International Standards Correspondence Index, or by using the Fnd facility of the BSI Standards Electronic Catalogue. Additional information In clause 2 the reference to prEN 1309 : 1994 should read prE
6、N 13092 Round and sawn timber - Method of measurement of dimensions - Part 2: Round timber and the footnote should read 1) Under preparation. In 4.3 the references to prEN 1309 : 1994 should read prEN 13042. Compliance with a British Standard does not of itself confer immunity from legal obligations
7、. Summary of pages This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 6, an inside back cover and a back cover. Amendments issued since publication ISBN O 580 28994 X STD-BSI BS EN 13Lb-3-ENGL 1778 = 1b24bb7 Ob88757 73T EUROPEAN STANDARD NORNE EUROPENNE EUROP
8、inizatons of the following countries are bound to implement this European Stan- Austria, Belgium, Czech Republic, Denmark, Finland, France, -, Greece, Iceland, Ireland, I*, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom co donal standards shall be withdr
9、awn at Contents Foreword 1 2 3 4 4.1 4.2 4.3 4.4 Scope Normative references Definitions Qualitative classification Grading principles Designation of grades Characteristics to be taken into account for the classification Tables of rules for grading page 2 3 3 3 3 3 3 3 4 O BSI 1998 1 Scope This stand
10、ard specifies a gualitative classification and grade designations for felled bees of ash (Fmxinus excelswr) and maples presented in the form of long poles or logs. The classifications describe quality classes of round timbers for which the intended use is not known. The maples classification is appl
11、ied for the foliowing species: Acer pseudoplatanus, Acer platanoides, Acer campestris. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publ
12、ications are listed hereafter. For dated references subsequent amendments to or revisions of any of these publications apply to this European Standaxd, only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 844-1 E
13、N 844-2 EN 44- prEN 1309 1994 EN 1310 EN 1311 Round and sawn timber- Part 1: General terms common to round timber and sawn timber Round and sawn timber- Part2: General terms relating to round timber Round and sawn timber- TinolOgy - Pari 8: Terms relating to features of round timber Round and sawn t
14、imber- Method of measurement of dimenswnsl Round and sawn timber- Method of measurmt of features Round and sawn timber- Mewd of measurement of Biological degrade Teminology - TemZinOlOgy - 3 Definitions For the purposes of this standard, the definitions in the standards EN 844-1, EN 844-2 and EN 844
15、-8 apply Page 3 EN 13163 : 1997 4 Qualitative classification 4.1 Grading principles Each long pole, log or portion of a round timber individualized by a theoretical crosscut point, is qualified according to its dimensions and to the presence, size and distribution of specific characteristics. 4.2 De
16、signation of grades Standardized designation of classes includes three characters, the latest one separated by a dash - the rst and second characters are the genus initia and first letter in Latin; - the third character indicates the qua - Fr-C is a less valuable quality class, - Fr-D is a quality c
17、lass which includes long pole, log or portion of long poles not permitted in the other quality classes. For al characteristics in cass Fr-D, more than 40 % of the volume of the wood shall be useable. 4.2.2 Maples (Ac) The classification of maples is divided into four quality classes: - Ac-A is an ex
18、ceptional quality class; - Ac-B is a normal quality class; - Ac-C is a less valuable quality class; - Ac-D is a quality class which includes long pole, log or portion of long pole not permitted in the other quality classes. For ail characteristics in class Ac-D, more than 40 % of the volume of the w
19、ood shall be useable. 4.3 Characteristics to be taken into account for the classification Tables 1 and 2 give the characteristics taken into account and these shall be measured according to prEN 1309 : 1994, EN 1310 and EN 1311. Limits of permitted characteristics of each class are given in tables 1
20、 and 2. A long pole, log or portion of round timber shall be downgraded by its failure to meet the requirement of amy single characteristic. Length and diameter shall be measured using the method stated in prEN 1309 : 1994l) 1 prEN 1309 : 1994 has been divided into two Parts; Part 2, in preparation,
21、 will be applicable to round timber. O BSI 1998 STDDBSI BS EN 23Lb-3-ENGL 1778 Lb24bbS Ob887b2 424 Page 4 EN 13163 : 1997 4.4 Tables of rules for grading nble 1. Grading rules for ash Characteristics) Class Fr-A Fr-B Fr-D Minimum for dimensions Minimum length in m Minimum middiameter under bark in c
22、m 32) 352) 22) 202) witsiout limit WlthOUt limit Uncovered sound knots Not allowed Not allowed C max. I 150mm/3mand diameter e mm Not allowed cmax 5 1501nmEm Allowed Allowed Uncovered rot knots Covered knots (buckles) Not allowed Not aowed Max. 1 buckle. Fax: 0181 996 7001. In response to orders for
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