Timber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine grading; additional requirements for factory production control

This European Standard specifies requirements additional to those given in EN 14081-1 for factory production control of machine graded structural timber with rectangular cross-sections shaped by sawing, planing or other methods, and having deviations from the target sizes corresponding to EN 336.

Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 3: Maschinelle Sortierung, zusätzliche Anforderungen an die werkseigene Produktionskontrolle

Structures en bois - Bois de structure à section rectangulaire classé pour sa résistance - Partie 3 : Classement mécanique ; exigences complémentaires relatives au contrôle de la production en usine

La présente Norme européenne fixe des exigences qui viennent s'ajouter à celles de l’EN 14081-1 sur le contrôle de production en usine des bois de structure de section rectangulaire classés par machine et profilé par sciage, rabotage ou d’autres méthodes, et dont les écarts admissibles de dimensions respectent les tolérances indiquées dans l'EN 336.

Lesene konstrukcije - Razvrščanje konstrukcijskega lesa pravokotnega prečnega prereza po trdnosti - 3. del: Strojno razvrščanje - Dodatne zahteve za kontrolo proizvodnje v obratu

Ta evropski standard določa dodatne zahteve poleg zahtev iz standarda EN 14081-1 za kontrolo proizvodnje v obratu strojno razvrščenega konstrukcijskega lesa s pravokotnim prečnim prerezom, oblikovanim z žaganjem, struženjem ali z drugimi metodami, in z odstopanji od ciljnih velikosti v skladu s standardom EN 336.

General Information

Status
Withdrawn
Publication Date
21-Nov-2018
Withdrawal Date
12-Jun-2022
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
13-Jun-2022
Due Date
06-Jul-2022
Completion Date
13-Jun-2022

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 3: Maschinelle Sortierung, zusätzliche Anforderungen an die werkseigene ProduktionskontrolleStructures en bois - Bois de structure à section rectangulaire classé pour sa résistance - Partie 3 : Classement mécanique ; exigences complémentaires relatives au contrôle de la production en usineTimber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine grading; additional requirements for factory production control91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-3:2012+A1:2018SIST EN 14081-3:2012+A1:2018en,fr,de01-december-2018SIST EN 14081-3:2012+A1:2018SLOVENSKI

STANDARDSIST EN 14081-3:20121DGRPHãþD
SIST EN 14081-3:2012+A1:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-3:2012+A1
October
t r s z ICS
y {ä r v r Supersedes EN
s v r z sæ uã t r s tEnglish Version

Timber structures æ Strength graded structural timber with rectangular cross section æ Part

uã Machine gradingâ additional requirements for factory production control Structures en bois æ Bois de structure à section rectangulaire classé pour sa résistance æ Partie

u ã Classement mécanique â exigences complémentaires relatives au contrôle de la production en usine

Holzbauwerke æ Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt æ Teil

uã Maschinelle Sortierungá zusätzliche Anforderungen an die werkseigene Produktionskontrolle This European Standard was approved by CEN on

s x December
t r s s and includes Amendment
s approved by CEN on
s w October
t r s yä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s v r z sæ uã t r s t ªA sã t r s z ESIST EN 14081-3:2012+A1:2018

EN 14081-3:2012+A1:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 3 Introduction .................................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 5 4 Requirements for the operation, calibration and maintenance of a grading machine ......... 5 5 Additional requirements for factory production control for machine controlled systems ............................................................................................................................................................... 6 5.1 General ................................................................................................................................................................ 6 5.2 Requirements for bending strength classes with a characteristic bending strength level above 30 N/mm2 and for tension strength classes with a characteristic tension strength level above 21 N/mm2 ................................................................................................................ 6 6 Additional factory production control requirements for output controlled systems ........... 6 6.1 General ................................................................................................................................................................ 6 6.2 Grading ................................................................................................................................................................ 6 6.3 Sampling ............................................................................................................................................................. 7 6.4 Destructive testing and calculation of characteristic values........................................................... 7 6.5 Batch verification ............................................................................................................................................ 7 6.6 Recording ........................................................................................................................................................... 7 Annex A (normative)

Requirements for using control planks ....................................................................... 9 A.1 General ................................................................................................................................................................ 9 A.2 Requirements for selecting the control planks .................................................................................... 9 A.3 Requirements for the use of control planks for internal factory production control ............ 9 A.4 Requirements for the use of control planks for third party factory production control .............................................................................................................................................................. 11 Bibliography ................................................................................................................................................................. 14 SIST EN 14081-3:2012+A1:2018

EN 14081-3:2012+A1:2018 (E) 3 European foreword This document (EN 14081-3:2012+A1:2018) has been prepared by Technical Committee CEN/TC124 “Timber structures “, the secretariat of which is held by AFNOR. 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 April 2019, and conflicting national standards shall be withdrawn at the latest by April 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes !EN 14081-3:2012". This document includes Amendment 1 approved by CEN on 2017-10-15. The start and finish of text introduced or altered by amendment is indicated in the text by tags !". This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. Other parts of the series of EN 14081 are: — EN 14081-1, Part

wã General requirements; — EN 14081-2, TimPart

xã Machine gradingâ additional requirements for initial type testing; — EN 14081-4, Part . Compared to EN 14081-3:2005 the following modifications have been made in EN 14081:2012: — the additional factory production control requirements for output controlled systems are transferred in Annex B (informative); — in Annex A, the requirements for using control planks are updated. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14081-3:2012+A1:2018

EN 14081-3:2012+A1:2018 (E) 4 Introduction 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. 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. These tests together with statistical procedures are used to monitor and adjust the machine settings to maintain the required strength properties for each strength class. With this system it is permissible for machine approval requirements to be less demanding and for machines of the same type to have non-identical performance. The machine controlled system was developed in Europe. Because of the large number of sizes, species and grades used it was not possible to carry out quality-control tests on timber specimens drawn from production. The system relies therefore on the machines being strictly assessed and controlled, and on considerable research effort to derive the machines settings, which remain constant for all machines of the same type. The acceptability of grading machines and the derivation of settings rely on statistical procedures and the results will therefore depend on the method used. For this reason, this European Standard gives appropriate statistical procedures. The requirements in this European Standard are based on machines in current use and on future types of machines as far as these can be foreseen. It is recognised that additional clauses or standards may be required if unforeseen developments take place. SIST EN 14081-3:2012+A1:2018

EN 14081-3:2012+A1:2018 (E) 5 1 Scope This European Standard specifies requirements additional to those given in EN 14081-1 for factory production control of machine graded structural timber with rectangular cross-sections shaped by sawing, planing or other methods, and having deviations from the target sizes corresponding to EN 336. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. !EN 384, Structural timber — Determination of characteristic values of mechanical properties and density" EN 408, Timber structures — Structural timber and glued laminated timber — Determination of some physical and mechanical properties EN 14081-1, Timber structures — Strength graded structural timber with rectangular cross section — Part

wã General requirements !EN 14081-2:2018, Timber structures — Strength graded structural timber with rectangular cross section — Part

xã Machine gradingâ additional requirements for type testing" 3 Terms and definitions For the purpose of this document, the terms and definitions given in EN 14081-1 and the following apply. !

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