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1、BRITISH STANDARD BS 8290-3:1991 Suspended ceilings Part 3: Code of practice for installation and maintenance Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:41:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8290-3:1991 This British Standard, having been pre
2、pared under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 January 1992 BSI 02-1999 The following BSI references relate to the work on this standard: Co
3、mmittee reference ECB 11 Draft for comment 90 14883 DC ISBN 0 580 20212 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Elements and Components (of Diverse Materials) for Buildings Standards Policy Committee (ECB/-) to Technical Commit
4、tee ECB/11, upon which the following bodies were represented: Association of Structural Fire Protection Contractors and Manufacturers Cold Rolled Sections Association Construction Fixings Association Department of Health Department of the Environment (Property Services Agency) Fibre Cement Manufactu
5、rers Association Ltd. Gypsum Products Development Association Local Authority Organizations Loss Prevention Council Royal Institute of British Architects Suspended Ceilings Association Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South
6、Bank University, Fri Dec 08 05:41:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8290-3:1991 BSI 02-1999i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Provision of information 2 4Site conditions 2 5 Installation 2 6 Electrical earth continuity of
7、installed ceiling suspension system 5 7 Protection of installed ceiling 5 8 Inspection of finished ceiling5 9Maintenance 5 Appendix A Guidance on methods of fixing to common materials 6 Publication(s) referred to Inside front cover Licensed Copy: London South Bank University, London South Bank Unive
8、rsity, Fri Dec 08 05:41:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8290-3:1991 ii BSI 02-1999 Foreword This Part of BS 8290, prepared under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Policy Committee, deals with the installation and maintenance
9、of suspended ceilings of dry construction with suspension systems of lightweight corrosion-resistant steel or aluminium alloy sections. BS 8290 supersedes CP 290:1973 which is withdrawn. BS 8290 is published in separate Parts, the other Parts being as follows: Part 1: Code of practice for design; Pa
10、rt 2: Specification for performance of components and assemblies. A suspended ceiling is a membrane suspended below a structural floor or roof to provide a finished soffit. Suspended ceilings have a variety of functions in forming the internal environment of buildings. They can provide concealment o
11、f services, protection of structure against fire, decorative finishes, thermal insulation and illumination. They can also provide heating and ventilation, and contribute to acoustic absorption, sound insulation and the reduction of condensation. Suspended ceilings are constructed from pre-fabricated
12、 components which together form an integrated system. For this reason they are usually installed by specialist ceiling contractors. 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. Com
13、pliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may h
14、ave had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:41:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8290-3:1991 BSI 02-19991 1 Scope This Part of BS 8290
15、 gives recommendations for the installation, earth continuity testing and maintenance of suspended ceilings complying with BS 8290-2. NOTEThe titles of the publications referred to in this Part of BS 8290 are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS 8290 the
16、 definitions given in BS 6100 apply, together with the following. Terms from BS 6100 that are particularly relevant, are reproduced below. 2.1 suspended ceiling ceiling hung at a distance from the floor or roof above 2.2 open ceiling suspended ceiling formed of louvres, open cells or similar ceiling
17、 components 2.3 luminous ceiling ceiling of translucent material or open ceiling with lamps in the ceiling void to light the space below 2.4 ceiling suspension system assembly of ceiling components for a suspended ceiling 2.5 exposed system ceiling suspension system with inverted T (tee) sections in
18、 which the infill units, open cells or similar components usually rest on the visible table of the system 2.6 concealed system ceiling suspension system with sections onto which infill units are slotted or mechanically fixed 2.7 main runner ceiling component suspended from the ceiling hangers in an
19、exposed system or mechanically fixed 2.8 primary channel ceiling component suspended from the ceiling hangers in a concealed system or open ceiling 2.9 ceiling hanger ceiling component that is used to connect a main runner or primary channel to the supporting structure above 2.10 tile section ceilin
20、g component that is fixed to the primary channel to support ceiling tiles 2.11 cross member ceiling component that spans between the main runners 2.12 noggin ceiling component that spans between tile sections 2.13 spline strip inserted into preformed grooves of adjacent ceiling infill units to form
21、a concealed mechanical joint for the purpose of restricting air movement through the tile joints 2.14 perimeter trim section fixed at the perimeter of a ceiling to support the outer components of the ceiling surface 2.15 ceiling linear strip ceiling component that consists of a profiled section and
22、provides part of the ceiling surface 2.16 metal tray metal ceiling component with formed edges that provides part of a ceiling surface 2.17 spring tee ceiling component that is fixed to the primary channels to support metal trays 2.18 open cell ceiling component that is formed as a grille and that p
23、rovides part of a ceiling surface 2.19 tile nfill unit with maximum dimensions of 600 mm 600 mm 2.20 panel infill unit with dimensions in excess of 600 mm 600 mm Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:41:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
24、BS 8290-3:1991 2 BSI 02-1999 2.21 plank infill unit with length in excess of 600 mm and a length at least three times the width 2.22 board dry lining unit mechanically fixed to a concealed grid 2.23 kerf preformed groove in the edge of a ceiling infill unit to accommodate the tile section in a conce
25、aled grid system 2.24 top fixing means or device by which ceiling hangers are secured to the building structure 3 Provision of information In addition to the design information recommended in clause 4 of BS 8290-1:1991, installers should be informed of the following items when invited to tender. a)
26、Installation programme. Phasing and sequence work should be stated so that it is known whether hangers, grids and infill units are to be fixed in one operation. b) Site location. Site address, location of rooms within the building and limitations regarding access and deliveries. c) Site facilities.
27、To prevent misunderstanding it should be made clear whether the following will be provided and by whom. 1) Unloading of ceiling materials and plant and distribution to the work locations. 2) Safe and secure storage in a dry covered area, in accordance with manufacturers instructions. 3) Boarded work
28、ing scaffolding to a level approximately 1 800 mm from the soffit of finished work and in suitable lifts to accommodate the varying levels, with facilities for fixing to the structural soffit. Alternatively mobile scaffold towers to an area adequate for the completion of the required programme. 4) E
29、lectrical power supply, in accordance with current safety regulations, to within 20 m of working areas. 5) Temporary lighting with an adequate level of illumination to enable a satisfactory ceiling finish to be obtained. 6) Removal of debris, packaging, etc. from agreed collecting points. 4 Site con
30、ditions The manufacturers recommended site conditions for the installation of their materials should be followed. Suspended ceilings are essentially a finishing trade and therefore the building should be in a suitable condition with regard to cleanliness, temperature and relative humidity before ins
31、tallation begins. The building should be fully enclosed, and all wet work should be completed and dried out unless the manufacturers recommendations allow otherwise. Where the use of mobile working platforms has been agreed, adequate and safe working spaces should be provided which are clean and cle
32、ar of materials and equipment. All work above the suspended ceiling should be completed before the suspended ceiling is installed with the exception of connections and balancing adjustments to services. 5 Installation 5.1 Setting out and levelling Sufficient information should be clearly indicated o
33、n the working drawings to enable the ceiling module and setting out points in each ceiling area applicable to all relevant trades to be established early. All trades should work to the same setting out points and data. The ceiling height in each area should be marked in relation to the elevation ben
34、ch marks and then transferred by means of water level, or rotating laser or other device. Setting out lines should be in both directions and squared accurately at the outset. NOTEBuilding tolerances are such that it may be difficult in large ceiling areas to maintain a strict alignment with modular
35、elements such as structural columns or window mullions. 5.2 Top fixings Before top fixings are installed, the suitability of the building structure from which the ceiling is to be suspended should be verified. Preferably all top fixings should be installed at the same time as the suspended ceiling t
36、o ensure accurate spacing. Top fixings should be installed strictly in accordance with the fixing device manufacturers instructions. Guidance on methods of fixing to common materials is given in Appendix A. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:41:3
37、2 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8290-3:1991 BSI 02-19993 5.3 Hangers Hangers should be spaced in accordance with the recommendations of the manufacturer of the ceiling system. Extra hangers may be required where additional loads such as luminaires are superimposed on the ceiling. Riv
38、ets should not be used to secure top or bottom of angle or strap hangers. Where hangers cannot be fixed at the recommended spacing due to the presence of services equipment or other obstructions, a sub-grid of appropriate span performance should be used. It should be securely supported to prevent la
39、teral movement. Hangers should be vertical or nearly vertical and should not press against insulation covering ducts or pipes. If hangers have to be fixed diagonally to avoid obstructions the horizontal force should be offset by bracing. Wire hangers should be carefully straightened and tensioned be
40、fore use. If the ceiling is likely to be subjected to upward movement, e.g. wind pressure, cleaning procedures etc., the hangers should be galvanized mild steel angle or some other rigid section. 5.4 Exposed grids 5.4.1 Main runners The main runners should be installed so that they are level. Levell
41、ing should be done with the supporting hangers taut to prevent any subsequent downward movement when the ceiling loads are applied. Kinks or bends should not be made in hanger wire or straps as a means of levelling the main runners. Where hanger wires pass through main runners the loops should be sh
42、arply bent and tightly wrapped to prevent vertical movement of the runner within the loop. Spliced joints of main runners should be staggered. There should be no visually apparent angular displacement of the longitudinal axis of one runner in relation to the next runner in line with it. 5.4.2 Cross
43、members Cross members that are supported by either main runners or other cross members should be installed so that they form a right angle with the intersecting runner. Cross tees should be flat and in plane with the flange of the main runners after insertion of the panels. Cross tees over 600 mm lo
44、ng which are cut and rest on the perimeter trim should be supported by an additional hanger. 5.4.3 Perimeter trim Perimeter trim should be neatly jointed at all external and internal angles. Straight run joints should be neat and adjacent lengths truly in line. All trim should be firmly fixed at the
45、 specified centres to the perimeter wall or other structure. 5.4.4 Holding down clips Where holding down clips are used to retain the infill units in the grid they should be located according to the manufacturers recommendations. When a ceiling is required to provide structural fire protection, fire
46、 resistance or both, only holding down clips which have been used in the appropriate fire test or assessment should be used. 5.4.5 Infill units Infill units should be handled with care to prevent soiling. Ceiling units should be so arranged that units less than one-half width do not occur unless oth
47、erwise directed. Infill units cut at perimeters should be trimmed to the full space between the last grid member and the perimeter trim to prevent subsequent movement. To minimize apparent texture and colour variations in deeply textured infill units three or four cartons should be worked together a
48、nd the selection should be random from carton to carton. 5.5 Concealed grids 5.5.1 Primary support channels The primary support channels should be installed so that they are level. Levelling should be done with the supporting hangers taut to prevent any subsequent downward movement when the ceiling
49、loads are applied. Kinks or bends should not be made in hanger wire or straps as a means of levelling. Where hanger wires are wrapped around primary channels the wire should be wrapped around twice and the loops should be tightly formed to prevent any vertical movement or rotation of the channel within the loop. 5.5.2 Perimeter trim Perimeter trim should be neatly jointed at all external and internal angles. Straight run joints should be neat and adjacent lengths truly in line. All trim should be firmly fixed at the specified centres to the perimeter wall or partiti
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