EN 14081-4:2005
(Main)Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine Grading -Grading machine settings for machine controlled systems
Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine Grading -Grading machine settings for machine controlled systems
This European Standard gives settings, derived according to the requirements given in EN 14081-2, for various combinations of strength classes or grades, grading machines and species from particular sources of growth. These settings are only applicable to timber from the sources indicated in the tables.
Settings for other grades, species or grading machines shall be added when the relevant information is sent to, and assessed by, CEN/TC 124.
Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte Systeme
Diese Europäische Norm enthält Einstellungen in Übereinstimmung mit den in EN 14081-2 festgelegten Anforderungen für verschiedene Kombinationen von Festigkeitsklassen oder Sortierklassen, für verschiedene Sortiermaschinen und verschiedene Holzarten unterschiedlicher Herkunft. Diese Einstellungen beziehen sich nur auf Bauholz der in den Tabellen angegebenen Herkunftsländer.
Structures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machine
La présente Norme européenne donne les réglages, obtenus conformément aux exigences de l’EN 14081-2, relatifs aux différentes combinaisons de classes ou catégories de résistance, aux machines de classement et aux essences issues de différentes sources. Ces réglages ne sont applicables qu'aux bois provenant des sources indiquées dans les tableaux.
Lesene konstrukcije - Razvrščanje konstrukcijskega lesa s fazonskimi kosi po trdnosti - 4. del: Strojno razvrščanje - Razvrščanje nastavitev strojev za strojno kontrolirane sisteme
General Information
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Standards Content (Sample)
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 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte SystemeStructures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systemes de contrôle par machineTimber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine Grading -Grading machine settings for machine controlled systems91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-4:2005SIST EN 14081-4:2006en01-maj-2006SIST EN 14081-4:2006SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14081-4November 2005ICS 79.040; 79.120.10 English VersionTimber structures - Strength graded structural timber withrectangular cross section - Part 4: Machine Grading -Gradingmachine settings for machine controlled systemsStructures en bois - Bois de structure de sectionrectangulaire classé selon le résistance - Partie 4:Classement par machine - Réglages pour les systèmes decontrôle par machineHolzbauwerke - Nach Festigkeit sortiertes Bauholz fürtragende Zwecke mit rechteckigem Querschnitt - Teil 4:Maschinelle Sortierung - Einstellungen vonSortiermaschinen für maschinenkontrollierte SystemeThis 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 14081-4:2005: ESIST EN 14081-4:2006
2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Symbols.4 5 Settings for timber strength grading machines.5
3Foreword This European Standard (EN 14081-4:2005) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by SFS. 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. Other parts of this European Standard are EN 14081-1, Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements EN 14081-2, Timber structures - Strength graded structural timber with rectangular cross section - Part 2: Machine Grading - Additional requirements for initial type testing EN 14081-3, Timber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine Grading - Additional requirements for factory production control According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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. SIST EN 14081-4:2006
4 1 Scope This European Standard gives settings, derived according to the requirements given in EN 14081-2, for various combinations of strength classes or grades, grading machines and species from particular sources of growth. These settings are only applicable to timber from the sources indicated in the tables. 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 336, Structural timber –Sizes, permitted deviations EN 14081-1:2005, Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements EN 14081-2:2005, Timber structures - Strength graded structural timber with rectangular cross section - Part 2: Machine Grading - Additional requirements for initial type testing 3 Terms and definitions For the purpose of this European Standard the terms and definitions in EN 14081-1:2005 and EN 14081-2:2005 and the following apply. 3.1
Speed range maximum and minimum throughput speeds appropriate to the critical speed for the derived settings (see 6.2.2 of EN 14081-2:2005). 4 Symbols a deflection (in mm) b width of timber cross section (in mm)
F force (units as stated) I indicating property (units as stated) P pressure (units as stated) t thickness of timber cross section (in mm) Et,mean characteristic mean tensile modulus of elasticity parallel to grain (in N/mm2)
ft,k characteristic tensile strength (in N/mm2)
ρk characteristic value of density (in kg/m3)
subscripts
n for setting being calculated a actual size measured as the average dimension of a batch 5 Settings for timber strength grading machines Tables 1 to 6 give settings for certain grades, timber species and types of grading machine. Settings for other grades, species or grading machines shall be added when the relevant information is sent to, and assessed by, CEN/TC 124. SIST EN 14081-4:2006
Species Permitted timber sizesb) (mm) Gradec)
or grade Combination Model value
Feed speed Range (m/min) Comments and additional requirements C24
C16 F = 2,68 F = 2,27 150 max Spruce Picea abies Picea sitchensis 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C16 F = 1,24 150 max C24 C16 F = 2,79 F = 1,90 150 max UK Ireland GB IE Pine
Pinus nigra Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C16 F = 1,34 150 max C27 C16 F = 2,48 F = 1,64 150 max Chile CL Radiata pine
Pinus radiata 44 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C24 C16 F = 2,35 F = 1,92 150 max Minimum temperature of timber at time of grading shall be –10 oC. The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm).
an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 ()735729,413n1.701nnn+=ttFbF
(kN) a)
See 7.3 of EN 14081-1:2005. b)
Timber sizes shall be to EN 336.
c) Grades prefixed by C are strength classes given in EN 338.
Species Permitted timber sizesb) (mm) Grade c)
or grade Combina-tion Model value
Feed speed Range (m/min) Comments and additional requirements C18 fmod= 20,8 C24 fmod= 20,8 C27 fmod= 21,8 C30 fmod= 28,5 C24 C35 fmod= 20,0 fmod= 46,5 Estonia Finland Latvia Norway Russiad) Sweden EE FI LV NO RU SE
Spruce Picea abies Pine Pinus
Sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C18 C30 C40 fmod= 23,8 fmod= 30,6 fmod= 54,5 150 max
Air temperature to be +10 oC min. +35 oC max. Minimum timber temperature to be –10 oC. Maximum relative humidity to be 85 %. Timber mean moisture content to be > 10 %. The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm).
Fn
= (5,5I n n bntn3)10-9
(N)
an = 830,7 tn-1,299
I n = 79.0mod24,022,0f8422nnbt
a) See 7.3 of EN 14081-1:2005. b) Timber sizes shall be to EN 336. c) Grades prefixed by C are strength classes given in EN 338. d) Settings apply only to timber grown west of the Ural mountain range in Russia.
Settings for Cook Bolinder (Tecmach) machine types SG-AR, SG-AF and SG-TF (continued) Source country or countries Source marka)
Species Permitted timber sizesb) (mm) Gradec) or grade combina-tion Model value
Feed speed Range (m/min) Comments and additional requirements Spain ES Scots pine Pinus Sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C27
C16 F = 2,84
F = 1,71
100 max Minimum temperature of timber at time of grading shall be -10 oC. The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 ()735729,413n1.701nnn+=ttFbF
(kN) Spain ES Corsican pine Pinus nigra 40 ≤ tn ≤ 70
100≤bn ≤ 200 C30
C18 Not relevant as all settings shall be calculated using equations in comments column 100 max Minimum temperature of timber at time of grading shall be
-10 oC. The following equations shall be used to calculate settings for the target size bn x tn.
(Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 FnC30 = (96,2979 – 0,489321tn)anbntn3 / (1,3189433.109 ) FnC18 = (54,4979 – 0,489321tn)anbntn3 / (1,3189433
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