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1、BRITISH STANDARD BS 4873:1986 Specification for Aluminium alloy windows UDC 692.82:669.715 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4873:1986 This British Stand
2、ard, having been prepared under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 December 1986 BSI 03-1999 First published August 1972 First revision December 1986
3、The following BSI references relate to the work on this standard: Committee reference ECB/42 Draft for comment 85/10257 DC ISBN 0 580 15612 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Elements and Components (of Diverse Materials)
4、for Buildings Standards Committee (ECB/-) to Technical Committee ECB/42 upon which the following bodies were represented: Aluminium Federation Aluminium Window Association Association of Builders Hardware Manufacturers British Standards Society Cold Rolled Sections Association Consumer Standards Adv
5、isory Committee of BSI Department of the Environment (Property Services Agency) Department of the Environment (Building Research Establishment, Princes Risborough Laboratory) Flat Glass Manufacturers Association Glass and Glazing Federation Incorporated Association of Architects and Surveyors London
6、 Housing Consortium Royal Institute of British Architects Steel Window Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4873:1986 BSI 03-1999 i Contents Page Com
7、mittees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Window types and handing2 4Materials3 5Construction7 6Work sizes and manufacturing tolerances8 7Glazing8 8Security8 9Safety8 10Weathertightness performance9 Appendix A Advisory notes on materials and construction10 Appendix B Op
8、tional features11 Appendix C Recommendations for marking11 Figure 1 Window types and handing5 Figure 2 Illustrations of window types and handing for working drawings6 Table 1 Exposure categories9 Publications referred to12 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29 GMT+00:00 200
9、6, Uncontrolled Copy, (c) BSI BS 4873:1986 ii BSI 03-1999 Foreword This British Standard, having been prepared under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Committee, supersedes BS 4873:1972 which is withdrawn. The standard specifies the types of
10、aluminium window now in use and follows the general format of the 1972 edition. The principal new features of this standard are as follows: a) the provision of a powder organic coating as an additional choice of finish to aluminium members; b) the specification of weathertightness performance requir
11、ements by reference to BS 6375-1. Account has also been taken of the considerably increased use of multi-light windows since 1972 and reference is now included to fixed lights, louvred and tilt and turn windows. The specification of timber has been deleted from the standard. When the 1972 edition wa
12、s published some types of aluminium window were manufactured in combination with timber which formed an important structural element of the window. Such windows are no longer produced and when wood surrounds are used they are not considered to be an integral part of the window; some advisory notes a
13、re however included in Appendix A. Performance requirements for the operation and strength of windows have not been included as it is the intention that in future they will be specified in the window product standards by reference to BS 6375-21) (see also A.1.1). A related British Standard is BS 528
14、6. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document compris
15、es a front cover, an inside front cover, pages i and ii, pages 1 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. 1)In preparation. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29 GMT+00:00 2006, Uncontrolled Cop
16、y, (c) BSI BS 4873:1986 BSI 03-1999 1 1 Scope This British Standard specifies materials, construction, finishes, hardware and weathertightness performance requirements for aluminium alloy windows and double windows intended to be installed vertically, including glass and glazing. Windows that are us
17、ed for replacement purposes and those that have thermally improved frames are included but the standard excludes the following: a) windows in which any frame member is longer than 3 m; b) fixed louvres; c) secondary windows applied to convert existing windows into double or coupled windows; d) windo
18、ws with frames designed to be glazed with glass complying with BS 5051 or BS 5544; e) the thermal properties of thermally improved frames. Advisory notes on materials and construction are given in Appendix A and details of optional features to be agreed between the manufacturer and the purchaser are
19、 given in Appendix B. Recommendations for marking are given in Appendix C. NOTEThe titles of the publications referred to in this standard are listed on page 12. 2 Definitions For the purposes of this British Standard the definitions given in BS 6100-1.0, BS 6100-1.5.1 and BS 6100-1.6 apply together
20、 with the following. NOTEThe definition given in 2.3 is a modification of that given in BS 6100-1.0. 2.1 aluminium alloy window a window incorporating aluminium alloy structural elements and glazing rebates 2.2 bearing device a wheel, roller, skid or other device fitted at the head or sill of a hori
21、zontally sliding window to support the weight of the sash and facilitate movement 2.3 casement a window, or part of a window, that opens on hinges, pivots, or variable geometry stays 2.4 coupled window one glazed frame with another glazed frame hinged or fastened to it, so that both open together fo
22、r ventilation and can be separated for cleaning purposes 2.5 design wind pressure the wind pressure that can be expected on a surface of a building having taken into account the S1, S2 and S3 factors and the shape of the building by applying pressure coefficients to the dynamic pressure of the wind
23、NOTESee CP 3:Chapter V-2. 2.6 double window two separate glazed frames superimposed in the same wall opening 2.7 fixing any item that is used to secure separate members of a window assembly to each other, to secure an item of hardware to a window member, or to secure a completed window assembly into
24、 the structure of a building 2.8 glazing gasket plastics or synthetic rubber members, used between the glass and the frame and/or the glass and the bead Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4873:1986 2 BSI 03-1999 2.9 hardware
25、fittings attached to the window that are used to operate and/or secure it 2.10 insulating glass unit two or more panes spaced apart and hermetically sealed in a factory 2.11 multi-light window a window incorporating opening and/or fixed lights within one perimeter frame 2.12 sash a movable frame of
26、a horizontally or vertically sliding window 2.13 secondary window a window either fitted into the same wall opening as an existing window, or applied to an existing window, to provide improved thermal and/or sound insulation 2.14 thermally improved frame a frame of an aluminium alloy window (2.1) th
27、at incorporates an insulating material to improve the thermal performance NOTEIt may be of the thermal barrier type, where the inner and outer faces are separated by the insulating material, or of the thermal clad type, where the insulating material is applied to the face or faces of the frame. 2.15
28、 weathertightness performance in respect of air permeability, watertightness and wind resistance 2.16 weatherstripping material around opening lights to reduce air and/or water penetration 3 Window types and handing NOTEWindow types and examples of handing are shown in Figure 1 and Figure 2. 3.1 Win
29、dow types The requirements of this British Standard shall apply to the following window types: a) hinged: side hung (open in or out), top hung (open out), bottom hung (open in), and tilt and turn; b) projecting: side hung (open in or open out) and top hung (open out or reversible); c) pivoted: horiz
30、ontal and vertical (hung centrally or off-centre including reversible); d) sliding: horizontal and vertical (including tilting sash to vertical); e) fixed lights; f) louvred: adjustable. NOTEWindows can be in multi-light form. 3.2 Handing In specifying the handing it shall be stated whether the wind
31、ow is viewed from the outside or inside. The handing of a multi-light or a horizontally sliding window is related to the position of the largest opening light. The arrangement of the multi-light shall be shown on a diagram. The handing of side hung and tilt and turn casements is related to the posit
32、ion of the hinges. The handing of a vertically pivoted window is described by the position of the pivots in relation to the opening out portion and the proportion opening outwards shall be stated. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29 GMT+00:00 2006, Uncontrolled Copy, (c)
33、BSI BS 4873:1986 BSI 03-1999 3 4 Materials2) 4.1 Aluminium Extruded aluminium members shall be fabricated from designated treated alloy 6063TF, 6063TE or 6063TB complying with BS 1474. When ancillary members such as sills, couplings and the like are formed from sheet materials, they shall be fabrica
34、ted from designated alloys 1200, 3103 or 5251 complying with BS 1470 or alloy 5005 complying with BS 4300/7 in a temper suitable for the particular type of application and degree of forming to be adopted. NOTEWhere integral colour anodized finishes are required, special aluminium alloys that are not
35、 covered by the above standards can be used, provided that they meet the required physical properties of the above standards. The aluminium profiles used in the construction of the frames excluding glazing beads, nibs, interlocks and similar features shall be, at minimum tolerance, not less than 1.2
36、 mm thick. The aluminium shall be finished by one of the following: a) anodizing complying with BS 3987; b) a liquid organic coating complying with BS 4842; c) a powder coating complying with BS 6496. 4.2 Frame joint sealing materials Materials shall be of a type suitable to form a seal against air
37、and water penetration and to withstand stresses during assembly, transportation, installation and operation of the window. Their suitability shall be assessed by carrying out the performance tests in clause 10. NOTEIt is the intention to add performance requirements for the operation and strength of
38、 windows to this standard when they have been published in BS 6375-2 (see foreword); the performance tests contained therein will then also assist in the assessment of suitability. 4.3 Bearing devices and hardware Bearing devices and hardware including metal components of hinges shall be manufacture
39、d from one of the following. a) Aluminium, of an alloy having mechanical strength properties at least equal to that of the frame, anodized either to grade AA15 of BS 1615 or in compliance with BS 3987 in the case of components that are permanently exposed externally. b) Aluminium, of an alloy having
40、 mechanical strength properties at least equal to that of the frame, protectively treated with a surface finish whose corrosion resistance is such that, when subjected to 72 h exposure in a neutral salt spray test as defined in BS 5466-1, there shall be no corrosion of the aluminium visible to the u
41、naided eye exceeding one spot per 600 mm2 of significant surface, and individual spots shall not be nearer to each other than 25 mm. No spot shall be larger than 1.6 mm in diameter. NOTEExamples of such treatment are liquid organic coatings, powder coatings and certain lacquers. c) Austenitic or fer
42、ritic steel complying with Table 4 of BS 1449-2:1983. NOTEFerritic steels may not be suitable in coastal or certain industrial environments. d) Zinc diecasting alloy A complying with BS 1004, nickel chromium plated in accordance with service condition No. 3 of BS 1224. e) Zinc diecasting alloy A com
43、plying with BS 1004, protectively treated with a surface finish whose corrosion resistance is such that when subjected to the test in 4.3 b) there shall be no corrosion of the zinc visible to the unaided eye exceeding one spot per 600 mm2 of significant surface, and individual spots shall be not nea
44、rer to each other than 25 mm. No spot shall be larger than 1.6 mm in diameter. f) Steel finished to classification No. Zn3 or Zn10 of BS 1706 and chromate passivation in accordance with class 2C or 2D of BS 6338. 2)See also Appendix A. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:08:29
45、GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4873:1986 4 BSI 03-1999 NOTEClassification No. Zn10 is strongly preferred, especially for parts which are frequently wetted by condensation or for service in marine or polluted industrial environments. Threaded fastenings such as nuts and bolts are outsi
46、de the scope of BS 1706. BS 3382-2 specifies zinc plating thicknesses for threaded components which are less than that in BS 1706 for classification Zn3 owing to limitations of the mating thread tolerances. There are, however, alternative proprietary zinc/zinc chromate non-electrolytic coatings avai
47、lable which provide improved corrosion protection and can meet the requirements of 4.3 g) by ensuring a minimum salt spray performance of at least 240 h. These coatings are permitted by BS 3382-7. g) Steel protectively treated with a surface finish whose corrosion resistance is such that, when subje
48、cted to the test in 4.3 b), there shall be no corrosion of the steel visible to the unaided eye exceeding one spot per 600 mm2 of significant surface, and individual spots shall not be nearer to each other than 25 mm. No spot shall be larger than 1.6 mm in diameter. To minimize corrosion arising fro
49、m electrolyte reaction, metals that are in contact with each other shall only be used in combinations that have ratings 0 or 1 for atmospheric environments given in PD 6484 or are otherwise protected to prevent electrolytic reaction. 4.4 Adjustable louvre blade holders Adjustable louvre blade holders shall be manufactured from either aluminium alloys and finishes as specified in 4.1 or moulded polypropylene which, when tested in accordance with BS 2782:Method 452B, contains 2 % carbon black. 4.5 Weatherstripping Weatherstripping shall be one of the following:
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