【英国标准word原稿】BS EN 1313-2-1999 圆形木材和锯材.允许偏差和优选尺寸.硬木锯材.doc

豆丁网：/kmust1british standardround and sawn timber permitted deviations and preferred sizes part 2: hardwood sawn timberthe european standard en 1313-2:1998 has the status of abritish standardics 79.040| bs en1313-2:1999| incorporating| corrigendum no. 1|第 5 页 共 13 页豆丁网：/kmust1|no copying without bsi permission except as permitted by copyright lawbs en 1313-2:1999national forewordthis british standard is the english language version of en 1313-2:1998, including corrigendum august 2000. it supersedes bs 5450:1977 which is withdrawn.the uk participation in its preparation was entrusted by technical committee b/543, round and sawn timber, to subcommittee b/543/2, sawn timber, which has the responsibility to: aid enquirers to understand the text; present to the responsible european committee any enquiries on the interpretation, or proposals for change, and keep the uk interests informed; monitor related international and european developments and promulgate them in the uk.a list of organizations represented on this subcommittee can be obtained on request to its secretary.national annex na (informative) contains the recommended reduction of sawn hardwood by processing.cross-referencesthe british standards which implement international or european publications referred to in this document may be found in the bsi standards catalogue under the section entitled international standards correspondence index, or by using thefind facility of the bsi standards electronic catalogue.informative referencebs 5756:1997, specification for visual strength grading of hardwood.a british standard does not purport to include all the necessary provisions of a contract. users of british standards are responsible for their correct application.compliance with a british standard does not of itself confer immunity from legal obligations.summary of pagesthis document comprises a front cover, an inside front cover, the en title page, pages 2 to 4, an inside back cover and a back cover.the bsi copyright notice displayed in this document indicates when the document was last issued.amd. no.datetext affected10981corrigendum no. 1august 2000indicated by a sideline.this british standard, having been prepared under the direction of the sector committee for building and civilengineering, was published under the authority of the standards committee and comes into effect on 15 march 1999bsi 08-2000isbn 0 580 32079 0amendments issued since publicationeuropean standarden 1313-2norme europe enneeuropa ische normnovember 1998ics 79.040incorporating corrigendum june 1999descriptors: wood, sawlogs, sawn timber, hardwood, dimensional deviations, dimensional stability, humidity, dimensionsenglish versionround and sawn timber permitted deviations and preferred sizes part 2: hardwood sawn timberbois ronds et bois scie s ecarts admissibles et dimensions pre fe rentielles partie 2: bois scie s feuillusrund- und schnittholz zula ssige abweichungen und vorzugsmae teil 2: laubschnittholzthis european standard was approved by cen on 8 november 1998.cen members are bound to comply with the cen/cenelec internal regulations which stipulate the conditions for giving this european standard the status of a national standard without any alteration. up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the central secretariat or to any cen member.this european standard exists in three official versions (english, french, german). a version in any other language made by translation under the responsibility of a cen member into its own language and notified to the central secretariat has the same status as the official versions.cen members are the national standards bodies of austria, belgium, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.ceneuropean committee for standardization comite europe en de normalisation europa isches komitee fu r normungcentral secretariat: rue de stassart 36, b-1050 brussels1998 cen all rights of exploitation in any form and by any means reserved worldwide for cen nationalmembersref. no. en 1313-2:1998 epage en 1313-2:1998bsi 08-2000forewordthis european standard has been prepared bytechnical committee cen/tc 175, round and sawncontentspagetimber, the secretariat of which is held by afnor. this european standard shall be given the status of anational standard, either by publication of an identicaltext or by endorsement, at the latest by may 1999, and conflicting national standards shall be withdrawn atthe latest by may 1999.according to the cen/cenelec internal regulations, the national standards organizations of the following countries are bound to implement this european standard: austria, belgium, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and the united kingdomthis standard is one of two concerning permitted deviations and preferred sizes of sawn timber.the other standard is:en 1313-1, round and sawn timber permitted deviations and preferred sizes part 1: softwood sawn timber.foreword 21scope 32normative references 33definitions34moisture content35change in size due to changes in moisture content36permitted deviations37preferred sizes 3annex a (informative) complementarynational sizes 4page 3en 1313-2:19981 scopethis european standard specifies permitted deviations and preferred sizes of european hardwood sawn timber at a moisture content of 20 %.2 normative referencesthis 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 publications are listed hereafter. for dated references, subsequent amendments to or revisions of any of these publications apply to this european standard onlywhen incorporated in it by amendment or revision. for undated references, the latest edition of the publication referred to applies.en 336, structural timber coniferous and poplar sizes, permissible deviations.en 844-1, round and sawn timber terminology part 1: general terms common to round timber and sawn timber.en 844-3, round and sawn timber terminology part 3: general terms relating to sawn timber.en 844-4, round and sawn timber terminology part 4: terms relating to moisture content.6 permitted deviationsfor a specified number of pieces of hardwood sawn timber of the same target thickness and/or width, the average thickness and/or width shall not be less than the target thickness and/or width.if the timber is for structural use, the permitted deviations shall be those specified in en 336.the permitted deviations, at a moisture content of 20 %, are the following.6.1 on thicknesses (t)t # 32 mm: 21 mm, +3 mm |t 32 mm: 22 mm, +4 mm |the permitted deviations of thicknesses apply to all thicknesses, not only to preferred ones.6.2 on widths (b)b # 100 mm: 22 mm, +6 mm100 mm 200 mm: 24 mm, +12 mm6.3 on lengths (l)en 844-6, round and sawn timber terminology part 6: terms relating to dimensions of sawn timber. en 1309-1, round and sawn timber method ofmeasurement of dimensions part 1: sawn timber.pren 13183-1, round and sawn timber method of measurement of moisture content part 1: method for determining moisture content of a piece of sawn timber (oven-dry method).pren 13183-2, round and sawn timber method of for unedged timber and boules: for square edged timber:7 preferred sizes0, +3 % of the target length but no more than 90 mm.0, +3 % of the target length but no more than 90 mm.measurement of moisture content part 2: method for estimating moisture content of a piece of sawn timber (electrical method).3 definitionsfor the purposes of this standard, the definitions contained in en 844-1, en 844-3, en 844-4 anden 844-6 apply.4 moisture contentthe measurement of moisture content shall be carried out according to pren 13183-1 or pren 13183-2.the reference moisture content is 20 %.5 change in size due to changes in moisture contentunless there is evidence to the contrary, it is assumed that the thickness and width of a piece of timber will increase by 0,25 % for every 1 % of moisture content higher than 20 % up to 30 %, and will decrease by 0,25 % for every 1 % of moisture content lower than 20 %. the above values are independent of the species.sizes are measured according to en 1309-1 at amoisture content of 20 %.7.1 preferred thicknesses20 mm, 27 mm, 32 mm, 40 mm, 50 mm, 60 mm,65 mm, 70 mm, 80 mm and 100 mm7.2 preferred widths10 mm intervals for widths between 50 mm and 90 mm20 mm intervals for widths of 100 mm or more7.3 preferred lengthsfor unedged timber and boules:0,10 m intervals for lengths between 2,00 m and 6,00 mfor square edged timber:0,05 m intervals where l # 1,00 m0,10 m intervals where l 1,00 mpage en 1313-2:1998bsi 08-2000annex a (informative) complementary national sizescomplementary preferred sizes in germany(de)thicknesses (in millimetres):1822 thickness of the board for all standardized pallets24 standardized thickness of the industrial packages25303545526378 thickness of the blocks for all the standardized palletswidth (in millimetres):145 width of the boards in standardized pallets, especially in euro-palletscomplementary preferred sizes in france (fr)thicknesses (in millimetres):35, 55complementary preferred sizes in the unitedkingdom (gb)thicknesses (in millimetres):19, 26, 38, 52, 63, 75complementary preferred sizes in ireland (ir)thicknesses (in millimetres):25, 38, 63, 75complementary preferred sizes in italy (it)width (in millimetres):250complementary preferred sizes in thenetherlands (nl)thicknesses (in millimetres):15, 18, 26, 34, 41, 45, 52, 54, 63, 75complementary preferred sizes in norway(no)widths (in millimetres):63, 75, 125, 150, 250bs en 1313-2:1999national annex na (informative)reduction of sawn hardwoods by processingna.1 generalprocessing of hardwoods to accurate finished sizes involves reductions in size which vary with the size, the process and the product. the figures in table na.1 have been established in the united kingdom as being economic, workable and not wasteful.na.2 reductionsthe recommended reductions appropriate to some end uses and products appear in table na.1. any finished sizes in british standards covering particular hardwood products and components will take precedence over those in table na.1. for other end uses not specifically mentioned, the same figures as those for one of the end uses listed may be adopted. intermediate figures would be unlikely to achieve any greater accuracy and would tend to confuse.if the timber is for structural use, the reduction limits specified in bs 5756 apply.na.3 permitted deviationsfor all finished sizes after processing, permitted deviations of 0,5 mm are recommended. if the timber is for structural use, the permitted deviations specified in bs en 336 apply.table na.1 recommended reductions from sawn size to finished target size by processing of two opposite facesdimensions in millimetresend use or productreduction from sawn size to finished target sizefor target sizes of width or thickness15 to 2526 to 5051 to 100101 to 150151 to 300floorings, matchings and interlocked boarding and planed all round56777trim678910joinery and cabinet wood79101214bs en|1313-2:1999bsi389 chiswick high roadlondonw4 4al| bsi british standards institution| bsi is the independent national body responsible for preparing british standards. it| presents the uk view on standards in europe and at the international level. it is| incorporated by royal charter.| revisions| british standards are updated by amendment or revision. users of british standards| should make sure that they possess the latest amendments or editions.| it is the constant aim of bsi to improve the quality of our products and services. we| would be 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