BS EN 14081-2-2005 木结构.带矩形横截面的强度分级的结构木材.第2部分机械分级.初始类型测试的附加要求.pdf
《BS EN 14081-2-2005 木结构.带矩形横截面的强度分级的结构木材.第2部分机械分级.初始类型测试的附加要求.pdf》由会员分享,可在线阅读,更多相关《BS EN 14081-2-2005 木结构.带矩形横截面的强度分级的结构木材.第2部分机械分级.初始类型测试的附加要求.pdf(34页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 14081-2:2005 Timber structures Strength graded structural timber with rectangular cross section Part 2: Machine grading; additional requirements for initial type testing The European Standard EN 14081-2:2005 has the status of a British Standard ICS 79.040 - - - - - BS EN 14081
2、-2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 February 2006 BSI 21 February 2006 ISBN 0 580 47819 X National foreword This British Standard is the official English language version of EN 14081-2:2005. This standard together with
3、BS EN 14081-1:2005 and BS EN 14081-3:2005 will supersede BS EN 518:1995 and BS EN 519:1995. EN 14081 is published in four parts of which EN 14081-1 is a candidate “harmonized” European Standard under the EU Construction Products Directive (89/106/EEC), and intended to lead to CE marking. EN 14081-1
4、is the subject of transitional arrangements agreed under the Commission mandate. BS EN 14081 Parts 1 to 3 will supersede BS EN 518:1995 and BS EN 519:1995 which will be withdrawn in June 2007. The UK participation in its preparation was entrusted to Technical Committee B/518, Structural timber, whic
5、h has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the secti
6、on entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Co
7、mpliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related
8、international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 31 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Am
9、endments issued since publication Amd. No. DateComments - - - - - e - - - - - - - - - - - - - I - - - - - - - - - - - - - - -E - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W W D - - - - - - - - - - - EN 14081-2:2005 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope.5 2 No
10、rmative references .5 3 Terms and definitions.5 4 Symbols.6 5 Requirements for strength grading machines7 6 Additional initial type testing for machine controlled systems.8 6.1 General 8 6.2 Requirements for the derivation and verification of machine settings.8 6.3 Machine installation check.12 7 Ad
11、ditional initial type testing for output controlled systems13 7.1 General 13 7.2 Requirements for the assessment of initial settings13 Annex A (normative) Calculation of elementary cost matrix values for 6.2.5.7.15 A.1 General 15 A.2 Factors for wrongly upgraded pieces .15 A.3 Factors for wrongly do
12、wngraded pieces 16 Annex B (informative) Guidance on the procedure of initial type testing for machine controlled systems .17 B.1 Introduction.17 B.2 Guidance17 Annex C (informative) Requirements for control planks.19 Annex D (informative) Control plank design concepts and materials20 D.1 General de
13、sign principles 20 D.2 Generic plank designs and materials20 D.3 Generic machine types.22 Bibliography.31 - - - - - EN 14081-2:2005 (E) 3 Foreword This European Standard (EN 14081-2:2005) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by SFS
14、. 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 May 2006, and conflicting national standards shall be withdrawn at the latest by August 2007. This European Standard has been prepared under a man
15、date given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). This European Standard supersedes EN 518:1995 and EN 519:1995. Other parts of this European Standard are: EN 14081-1 Timber structures Strength graded structu
16、ral timber with rectangular cross section Part 1: General requirements, EN 14081-3 Timber structures Strength graded structural timber with rectangular cross section Part 3: Machine grading; additional requirements for factory production control, EN 14081-4 Timber structures Strength graded structur
17、al timber with rectangular cross section Part 4: Machine grading; grading machine settings for machine controlled systems. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgiu
18、m, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. - - - - - EN 14081-2:2005 (E) 4 Introductio
19、n Machine grading is in common use in a number of countries. The countries use two basic systems, referred to as output controlled and machine controlled. Both systems require a visual override inspection to cater for strength-reducing characteristics that are not automatically sensed by the machine
20、. The output-controlled system is suitable for use where the grading machines are situated in sawmills grading limited sizes, species and grades in repeated production runs of around one working shift or more. This enables the system to be controlled by testing timber specimens from the daily output
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