1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12446:2011Chimneys Components Concrete outer wall elementsBS EN 12446:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12446:2011.
2、 Itsupersedes BS EN 12446:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/506, Chimneys.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessar
3、yprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 57697 3ICS 91.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committe
4、e on 31 August 2011.Amendments issued since publicationDate Text affectedBS EN 12446:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12446 June 2011 ICS 91.060.40 Supersedes EN 12446:2003English Version Chimneys - Components - Concrete outer wall elements Conduits de fume - Composants - Env
5、eloppes externes en bton Abgasanlagen - Bauteile - Auenschalen aus Beton This European Standard was approved by CEN on 25 May 2011. 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 stan
6、dard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in a
7、ny other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Rep
8、ublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN D
9、E NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12446:2011: EBS EN 12446:2011EN 12446:2011 (E) 2 Contents Page Foreword 41 Sco
10、pe 52 Normative references 53 Terms and definitions .54 Materials .74.1 General 74.2 Reaction to fire .75 Reinforcement for handling 76 Surface treatment 77 Form, dimensions and tolerances .87.1 Form 87.2 Dimensions .87.3 Tolerances 87.4 Squareness of ends .88 Performance .98.1 Heat stress resistanc
11、e .98.2 Heat shock resistance 108.3 Thermal resistance . 108.4 Compressive strength 108.5 Bulk density . 108.6 Freeze-thaw resistance 108.7 Flexural strength under wind loading 118.8 Gas tightness of passages used for combustion air 118.9 Resistance to fire external to external 118.10 Dangerous subs
12、tances 119 Designation . 129.1 Designations and classes 129.2 Temperature classes 129.3 Pressure class application 129.4 Soot fire resistance class 129.5 Distance to combustible materials . 129.6 Manufacturers information class . 1310 Marking 1311 Product information 1312 Evaluation of conformity 14
13、12.1 General . 1412.2 Initial type testing . 1412.3 Further type tests 1412.4 Factory production control 14Annex A (normative) Test methods 16Heat stress resistance and heat shock test . 16A.1 16Apparatus 16A.1.1 16A.1.2 Test assembly . 16BS EN 12446:2011EN 12446:2011 (E) 3 A.1.3 Test environment an
14、d conditioning 19A.1.4 Procedure . 20A.1.5 Test results 21A.2 Flexural strength under wind load . 21A.2.1 Principle 21A.2.2 Preparation of test specimen . 21A.2.3 Test procedure . 21A.3 Gas tightness test . 22A.3.1 Apparatus . 22A.3.2 Test environment and conditioning 22A.3.3 Procedure . 22A.3.4 Res
15、ult 23Annex B (normative) Requirements of sampling plan according to ISO 2859-1 at an Acceptable Quality Level (AQL) and inspection level S2 Inspection Procedure 24B.1 Acceptability determination . 24B.1.1 General . 24B.1.2 Single sampling . 24B.1.3 Double sampling 24B.2 Normal inspection . 24B.3 Re
16、duced Inspection 26B.4 Reduced to normal inspection . 26B.5 Tightened inspection 26B.6 Tightened to normal inspection . 27B.7 Discontinuation of inspection 27Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU Construction Products Directive . 28ZA.1 Scope an
17、d relevant characteristics . 28ZA.2 Procedure of attestation of conformity of concrete outer wall elements 29ZA.2.1 System of attestation of conformity 29ZA.2.2 EC Certificate and Declaration of conformity . 31ZA.3 CE Marking and labelling 31Bibliography 34BS EN 12446:2011EN 12446:2011 (E) 4 Forewor
18、d This document (EN 12446:2011) has been prepared by Technical Committee CEN/TC 166 “Chimneys”, the secretariat of which is held by ASI. 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 December 20
19、11, and conflicting national standards shall be withdrawn at the latest by March 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights.
20、 This document supersedes EN 12446:2003. The main modifications to EN 12446:2003 are: a) a revised table of heat flow values for thermal performance testing which now includes values for high pressure applications, e.g. diesel generators, b) a test method for the evaluation of Flexural strength unde
21、r wind loading (clause 8.7 and Test methods clause A.2), c) a requirement to evaluate the gas tightness of passages used for combustion air (clause 8.8 and Test methods clause A.3), d) a requirement relating to the Resistance to fire from an external source (clause 8.9), e) a requirement relating to
22、 the Release of dangerous substances (clause 8.10). This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s) 89/106/EEC, see informati
23、ve Annex ZA, which is an integral part of this document. This standard is one of a series of co-ordinated standards dealing with specification, design, testing and installation of chimneys, both single and multi wall. The co-ordinated package of standards is further divided by material of constructi
24、on and this European Standard is one of a series of specifications and execution documents dealing with design and installation of concrete chimney products and systems. The standards in this series for concrete chimney products and systems are: EN 1857, Chimneys Components Concrete flue liners EN 1
25、858, Chimneys Components Concrete flue blocks EN 12446, Chimneys Components Concrete outer wall elements According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croat
26、ia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 12446:2011EN 12446:2011
27、 (E) 5 1 Scope This European Standard specifies the material, dimensional and performance requirements for factory made precast concrete outer wall elements for chimneys including outer wall fittings. This European Standard covers elements having up to four passages designated to accommodate a combi
28、nation of flue liners and/or ventilation passages. This European Standard also relates to storey-height and reinforced outer wall elements. This European Standard does not apply to structurally independent (freestanding or self-supporting) chimneys constructed using these outer wall elements. NOTE A
29、ny reference to the term “outer wall element“ implies both the outer wall elements and their fittings, except where otherwise indicated. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited appl
30、ies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1443:2003, Chimneys General requirements EN 1857:2010, Chimneys Components Concrete flue liners EN 1858:2008, Chimneys Components Concrete flue blocks EN 10088-2:2005, Stainless steels P
31、art 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10218-2, Steel wire and wire products General Part 2: Wire dimensions and tolerances EN 14297:2004, Chimneys Freeze-thaw resistance test method for chimney products ISO 2859-1, Sampli
32、ng procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1443:2003 and the following apply. 3.1 outer wall fitting outer wal
33、l element such as access openings, offsets 3.2 concrete material formed by mixing cement, coarse and fine aggregate and water and with or without the incorporation of admixtures, additions, glass fibres or steel fibres, which develops its properties by hydration of the cement EN 206-1:2000 BS EN 124
34、46:2011EN 12446:2011 (E) 6 3.3 outer wall element chimney component that surrounds a flue liner to form the outer wall of a chimney 3.4 hollow wall outer wall element outer wall element having vertical cavities NOTE Cavities can pass through both ends of the hollow wall outer wall element. 3.5 manuf
35、acturers declared internal transverse dimensions internal dimensions of the outer wall element measured perpendicular to the longitudinal axis 3.6 manufacturers declared height internal height of the outer wall element NOTE Examples of measurement are shown in Figure 1. Key H Internal height Figure
36、1 Internal height 3.7 manufacturers declared structural height maximum safe constructional height of the outer wall elements as declared by the manufacturer 3.8 manufacturers declared overall wall thickness dimensions at its thinnest point, between the inside face and the outside face of the outer w
37、all element, not measured at any joint feature, e.g. spigot/socket end 3.9 outer wall element with handling reinforcement outer wall element having steel reinforcement to assist handling and transportation 3.10 solid wall outer wall element outer wall element without cavities in the thickness of its
38、 walls BS EN 12446:2011EN 12446:2011 (E) 7 3.11 straight outer wall element outer wall element having the ends perpendicular to the axis of the flue 3.12 storey-height outer wall element factory made outer wall element having an overall height relating to the floor to floor height of a building 3.13
39、 precast concrete concrete that is cast in a place other than its final location of use EN 1858:2008 4 Materials 4.1 General Outer wall elements shall be made of pre-cast concrete. Materials shall be identified for factory production control purposes. NOTE Additions can include glass or steel fibres
40、. 4.2 Reaction to fire Attention is drawn to the Commission Decision 96/603/EC, as amended, in which non-combustible masonry units containing not more than 1 % by mass or volume (whichever is the more onerous) of homogeneously distributed organic materials are classified as reaction to fire class A1
41、 without testing. 5 Reinforcement for handling Where an outer wall element is reinforced for handling, the reinforcement shall have a maximum diameter of 8 mm and a minimum concrete cover of 15 mm on all sides for temperature classes up to and including T 250 and 20 mm on all sides for all other tem
42、perature classes. In outer wall elements having a bulk density of less than 2 000 kg/m3, when measured according to A.10 of EN 1857:2010, any reinforcement shall be protected against corrosion by one of the following means: a) use of stainless steel conforming to the requirements of EN 10088-2; b) b
43、y completely covering any mild steel reinforcement conforming to the requirements of EN 10218-2 with a coating (e.g. Portland cement CEM I or CEM II mixed with water to form a slurry, or epoxy resin). 6 Surface treatment Any surface treatment of the outer wall element, e.g. render, coating, shall be
44、 applied as described by the product manufacturer, prior to testing. BS EN 12446:2011EN 12446:2011 (E) 8 7 Form, dimensions and tolerances 7.1 Form Outer wall elements covered by this standard shall be manufactured in one of the following forms: a) with a single passage to accommodate a flue liner;
45、b) with up to four passages to accommodate a combination of up to four flue liners and/or duct/s used for ventilation/combustion air. 7.2 Dimensions Outer wall elements shall have a wall thickness not less than 20 mm. 7.3 Tolerances Tolerances on manufacturers declared dimensions, including taper, s
46、hall be: a) Declared internal transverse dimensions below 300 mm: 3 mm 300 mm and above: 1,5 % b) Declared height below 300 mm 5 mm 300 mm to 700 mm: 7 mm above 700 mm: 10 mm c) Declared overall wall thickness below 10 mm: 21+mm 10 mm to 40 mm : 51,5+mm above 40 mm: 125+% 7.4 Squareness of ends When
47、 tested in accordance with either procedure described in A.3 of EN 1857:2010, the permissible deviation from squareness of ends of concrete outer wall elements shall not be greater than 10 mm at G for the first procedure. With the second procedure the deviation shall not be more than 5 mm at G for e
48、lements up to 400 mm and 8 mm at G for elements greater than 400 mm in height. BS EN 12446:2011EN 12446:2011 (E) 9 8 Performance 8.1 Heat stress resistance 8.1.1 When an outer wall element, including those designated soot fire resistant, is tested as described in A.1 at the test temperature given in
49、 Table 1 appropriate to the designation, it shall also meet the requirements of 8.4. When an outer wall element has multiple passages with an equal wall thickness, the heat stress test shall be carried out on the passage with the highest temperature designation. 8.1.2 Bends or fittings, made of the same material mix and by the same method of manufacture as the tested
