EN 14081-3:2005

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 de section rectangulaire classé selon la 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 14081-3:2005SIST EN 14081-3:2006en01-maj-2006SIST EN 14081-3:2006SLOVENSKI
STANDARDSIST EN 519:1996SIST EN 518:19961DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14081-3November 2005ICS 79.040Supersedes EN 518:1995, EN 519:1995
English VersionTimber structures - Strength graded structural timber withrectangular cross section - Part 3: Machine grading; additionalrequirements for factory production controlStructures en bois - Bois de structure à sectionrectangulaire classé pour sa résistance - Partie 3:Classement mécanique; exigences supplémentaires enconcernant le contrôle de la production en usineHolzbauwerke - Nach Festigkeit sortiertes Bauholz fürtragende Zwecke mit rechteckigem Querschnitt - Teil 3:Maschinelle Sortierung; zusätzliche Anforderungen diewerkseigene ProduktionskontrolleThis European Standard was approved by CEN on 26 August 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14081-3:2005: ESIST EN 14081-3:2006

Example of cusum control charts.11 Annex B (normative)
Requirements for using control planks.15 B.1 General.15 B.2 Production control.15 B.3 The procedure for the use of a control plank.16 B.4 The non-continuous indicating property.16 B.5 Recorded usage of a control plank.17 B.6 Care of a control plank when not in use.17 B.7 Discarded control planks.17
cusum control parameter
B
cusum control parameter
Ba
cusum parameter associated with acceptable quality level
Br
cusum parameter associated with rejectable quality level Ep
actual modulus of elasticity measured in a proof load test (in N/mm2)
E0,mean
characteristic mean modulus of elasticity parallel to grain (in N/mm2)
Fp
proof load (in N)
K
cusum control parameter
La
run length in acceptable region for cusum control
Lr
run length in rejectable region for cusum control
N
cusum control parameter
Y
cusum control parameter
Z
cusum control parameter 5 Requirements for the operation, calibration and maintenance of a grading machine 5.1 No modifications shall be made to the machine that are in conflict with the machine manufacturer’s specification. 5.2 Access to all machine adjustments shall be limited to personnel authorised to operate or set up the machine. 5.3 The strength grading machine shall be regularly calibrated in accordance with the manufacturer's specification (see 5.2 in EN 14081-2:2005). 5.4 A strength grading machine shall only be fitted with spare parts equivalent to, or improving upon, the performance of those fitted at the time the machine was assessed by initial type testing. If spare parts are fitted that are not identical to those fitted at the time the machine was assessed by initial type testing, they shall be reassessed to establish their effect on grading accuracy. 5.5 The results of routine service and maintenance to the strength-grading machine and ancillary equipment shall be recorded together with the results of calibration checks. SIST EN 14081-3:2006

18 times the piece depth and using third-point loading with the tension edge selected at random and the estimated weakest cross section positioned where possible within the centre third of the span. b) Determine the actual modulus of elasticity Ep in accordance with 7.2.1 c) of EN 14081-2:2005. The rate of applied stress shall be 110 N/mm2/min. The number of specimens that fail below the proof load and the values of Ep shall be recorded on the cusum control charts. NOTE For an example see Annex A. SIST EN 14081-3:2006

(1) where
E0,mean
is the equal to the mean modulus of elasticity for the strength class. A constant ‘A’ shall be calculated from the equation A = 7 381/E0,mean and used in Figure 1 to determine two values of B expressed as Ba when La = 150 and Br when Lr = 5. The remaining control constants Y and Z are then calculated from: Y = 0,046 7E0, mean Ba
(2) N = 0,046 7E0, mean Br
(3) Z = Y + N
(4) 7.2.4 All results from the tests on quality-control specimens from production shall be entered on the control
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