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1、BRITISH STANDARD BS 8233:1987 Incorporating Amendment No.1 Code of practice for Sound insulation and noise reduction for buildings (Formerly CP 3: Chapter III) UDC 699.844 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:06 GMT+00:00 2006, Uncontrolled Copy
2、, (c) BSI BS 8233:1987 This British Standard, having been prepared under the direction of the Basic Data and Performance Criteria for Civil Engineering and Building Structures Standards Committees, was published under the authority of the Board of BSI and comes into effect on 28 August 1987 BSI 02-1
3、999 First published, 1948 First revision, October 1960 Published, in metric form, March 1972 Second revision, as BS 8233, August 1987 The following BSI references relate to the work on this standard: Committee reference BDB/51 Draft for comment 78/11261 DC ISBN 0 580 15874 8 Committees responsible f
4、or this British Standard The preparation of this British Standard was entrusted by the Basic Data and Performance Criteria for Civil Engineering and Building Structures Standards Committee (BDB/-) to Technical Committee BDB/51, upon which the following bodies were represented: Aggregate Concrete Blo
5、ck Association Autoclaved Aerated Concrete Products Association British Airports Authority British Precast Concrete Federation Ltd. Calcium Silicate Brick Association Limited Concrete Society Consumer Standards Advisory Committee of BSI Department of the Environment (Building Research Establishment)
6、 Department of the Environment (Property Services Agency) Department of Transport (Transport and Road Research Laboratory) Incorporated Association of Architects and Surveyors Institute of Acoustics Institute of Physics Institution of Civil Engineers Institution of Environmental Health Officers Inst
7、itution of Structural Engineers Motor Industry Research Association Noise Abatement Society Royal Institute of British Architects Royal Institution of Chartered Surveyors Scottish Development Department Timber Research and Development Association Wood Wool Slab Manufacturers Association Amendments i
8、ssued since publication Amd. No.Date of issueComments 6470January 1991Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8233:1987 BSI 02-1999i Contents Page Committees res
9、ponsibleInside front cover Forewordiii Section 1. General 0Introduction1 1Scope1 2Definitions1 3Symbols3 Section 2. Planning and design 4Principles of assessment5 5Legislative background6 6Outside noise6 7Basic design guide10 Section 3. Specific types of building 8Dwellings12 9Educational buildings1
10、3 10Industrial buildings15 11Offices16 12Health and welfare buildings17 13Miscellaneous building types20 Section 4. Noise control 14Constructional techniques influencing noise control23 15Services noise36 16Quality control37 17Design implications of noise control38 Appendix A Special problems requir
11、ing expert advice39 Appendix B Noise calculations39 Appendix C Statute law44 Appendix D Noise surveys45 Appendix E Airborne and impact sound insulation46 Appendix F Bibliography56 Figure 1 Sound bypassing a sound-insulating partition via the void above a suspended ceiling26 Figure 2 Two methods of r
12、educing sound transmission through the void26 Figure 3 Sound reduction by means of a lobby28 Figure 4 Insulated wood-joist floor with heavy pugging29 Figure 5 Insulated wood-joist floor with light pugging30 Figure 6 Concrete floor (floating screed type)33 Figure 7 Concrete floor (floating wood raft
13、type)33 Figure 8 Edge treatments of floating floors on concrete34 Figure 9 Plan showing isolated box structure36 Figure 10 The addition of two noise levels40 Figure 11 Subtraction of noise levels41 Figure 12 Sound insulation of non-uniform partitions42 Figure 13 A-weighting curve43 Figure 14 Program
14、 to calculate A-weighted sound level from band-limited levels44 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8233:1987 ii BSI 02-1999 Page Figure 15 Transmission paths (via the structure) of noise origina
15、ting in room 1 (diagrammatic)47 Figure 16 Indirect sound leakage paths48 Figure 17 Application of caulking material to lightweight partitions49 Figure 18 Mass law curve50 Table 1 Symbols4 Table 2 Traffic noise levels7 Table 3 Recommended criteria for control of development in areas affected by aircr
16、aft noise8 Table 4 NNI and LAeq, 12 h8 Table 5 Noise from trains8 Table 6 Peak wheel/rail noise at 25 m from track9 Table 7 Noise from industrial premises9 Table 8 Maximum noise levels in unoccupied spaces14 Table 9 Minimum sound insulation14 Table 10 Maximum noise levels and speech communication17
17、Table 11 Mean sound insulation of partitions with doors (7 % of area)27 Table 12 Sound insulation of windows27 Table 13 Effect of window size on the sound insulation of walls27 Table 14 Sound insulation of sheet materials51 Table 15 Airborne sound insulation of walls and partitions53 Table 16 Airbor
18、ne and impact sound insulation of floor constructions55 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8233:1987 BSI 02-1999iii Foreword This British Standard has b
19、een prepared under the direction of the Basic Data and Performance Criteria for Civil Engineering and Building Structures Standards Committee. It supersedes CP 3:Chapter III:1972 which is withdrawn. The code is intended for use by designers and constructors of buildings and those concerned with cent
20、ral and local government building control, planning and environmental health. This revision incorporates the results of research and experience gained over the last two decades and provides up-to-date information on the rating of noise and the rating of the sound insulation of building elements. Cha
21、nges in the subjective significances of different kinds of noise are reflected in the revisions to the code. The present availability of good textbooks and numerous government publications makes much of the explanatory material in CP 3:Chapter III unnecessary for the present code. The information in
22、 this code follows, as far as is reasonable, the usual sequence of activities in building design. For planning and design of new buildings clauses 4 to 7 give a general background and clauses 15 to 17 give more specific information. For a particular type of building, the appropriate clause of clause
23、s 8 to 13 will apply. Clause 14 gives information for the particular combination of building elements being designed. Where change of use of, or improvements to, an existing building are being considered, the above sequence applies except for clause 6 (outside noise) if it is clear that no new noise
24、 will be emitted from or transmitted to the building. It has been assumed in the drafting of this code of practice that the execution of its provisions is entrusted to appropriately qualified and experienced people. A British Standard does not purport to include all the necessary provisions of a con
25、tract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular, attention is drawn to the Town and Country Planning Act 1971, the Building Regulations 1985, the Building Regu
26、lations (Northern Ireland) 1977 and the Building Standards (Scotland) Regulations 1981. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 62, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have
27、 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 05:33:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI vi blank Licensed Copy: London South Bank University, Londo
28、n South Bank University, Fri Dec 08 05:33:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8233:1987 BSI 02-19991 Section 1. General 0 Introduction Noise control in and around buildings is treated in this code of pratice on an objective and quantifiable basis as far as is presently possible. It shou
29、ld be borne in mind, however, that people vary very widely in their sensitivity to, and tolerance of, noise. Moreover, there is no such thing as a meter to measure the pleasantness of sounds, so it is difficult to ascribe numerically the difference between “pleasant” sounds like gentle wind in the t
30、rees and “unpleasant” sounds like a child crying. Important though these factors may be, it is not practicable to take them into account in this code. Attention is drawn to the need to comply with fire, health and safety requirements which should be taken into account in all sound insulation conside
31、rations. 1 Scope This British Standard gives recommendations for the control of noise in and around buildings. Except where it produces sound, vibration in buildings is outside the scope of this code. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover
32、. See also the Bibliography in Appendix F, references to which are identified in the text by numbers in square brackets. 2 Definitions For the purposes of this British Standard, the definitions given in BS 4727-3:Group 08, BS 5775-7 and BS 5821 apply together with the following. NOTE 1Where applicab
33、le, the definitions are consistent with those given in ISO 1996/1-1982. NOTE 2The term “noise level” is sometimes used in place of “sound level”. 2.1 a-weighted sound pressure the root mean square sound pressure (measured in pascals) determined by use of frequency-weighting network “A” NOTE 1See als
34、o BS 5969. NOTE 2The A-weighting network modifies the electrical response of a sound level meter so that the sensitivity of the meter varies with frequency approximately in the same way that the sensitivity of the human hearing system varies with frequency. 2.2 a-weighted sound pressure level ten ti
35、mes the common logarithm of the ratio of the square of the A-weighted sound pressure to the square of the reference sound pressure the A-weighted sound pressure level LpA (in dB) is given by the equation: LpA = 10 log (pA/po)2 where NOTEMeasurements of A-weighted sound pressure level are usually mad
36、e to assist in judging the effects of noise on people. 2.3 sound pressure level ten times the common logarithm of the ratio of the square of the sound pressure to the square of the reference sound pressure The sound pressure level Lp (in dB) is given by the equation: Lp = 10 log (p/po)2 where NOTETh
37、e range of sound pressures for ordinary sounds is very wide. The use of decibels gives a smaller, more convenient, range of numbers. For example, sound pressure levels ranging from 40 dB to 90 dB correspond to sound pressures ranging from 0.002 Pa to 0.63 Pa. 2.4 percentile level the A-weighted soun
38、d pressure level obtained by using time-weighting “F” that is exceeded by N % of the time interval considered NOTE 1Example: LA95, 1 h is the A-weighted level exceeded for 95 % of 1h. NOTE 2See also BS 5969. NOTE 3Percentile levels as determined over a certain time interval cannot generally be extra
39、polated to other time intervals. 2.5 equivalent continuous A-weighted sound pressure level value of the A-weighted sound pressure level of a continuous, steady sound that, within a specified time interval T starting at t1 and ending at t2 and measured in decibels, has the same mean square sound pres
40、sure as the sound under consideration whose level varies with time. The equivalent continuous A-weighted sound pressure level LAeq, T (in dB) is given by the equation: pAis the A-weighted sound pressure (in Pa); pois the reference sound pressure (i.e. 20 4Pa). p is the root mean square sound pressur
41、e (in Pa); pois the reference sound pressure (i.e. 20 4Pa). LAeq T, 10 1 t2t1 - - pAt ( )2 2 po - -td t1 t2 log= Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8233:1987 2 BSI 02-1999 where NOTE 1Equivalent
42、 continuous A-weighted sound pressure during time interval T is also called time interval average sound level, LA, T, (in dB), with the averaging time interval usually indicated in the format, for example, one hour average sound level, LA, 1 h. NOTE 2Equivalent continuous A-weighted sound pressure l
43、evel is also used for assessment of occupational noise exposure (see ISO 1999). 2.6 sound exposure level the sound exposure level LAE (in dB) of a discrete noise event is given by the equation: where NOTELAE is given in BS 5727 as LAX (single-event noise exposure level). 2.7 measurement time interva
44、l that time interval over which the squared A-weighted sound pressure is integrated and averaged 2.8 reference time interval the time interval to which an equivalent continuous A-weighted sound pressure level can be referred NOTE It may be specified in national or international standards or by local
45、 authorities to cover typical human activities and variations in the operation of sound sources. 2.9 long term time interval a specified time interval for which the results of the noise measurement are representative NOTEThe long term time interval consists of a series of reference time intervals an
46、d is determined for the purpose of describing the environmental noise and is generally designated by competent authorities. 2.10 long term average sound level the average over the long term time interval of the equivalent continuous A-weighted sound pressure levels for a series of reference time int
47、ervals comprised within the long term time interval NOTEAveraging should be carried out as described in ISO 1996/21). 2.11 rating level the equivalent continuous A-weighted sound pressure level during a specified time interval, plus specified adjustments for tonal character and impulsiveness of the
48、sound 2.12 long term average rating level the average over the long term time interval of the rating levels for a series of reference time intervals NOTEAveraging should be carried out as described in ISO 1996/21). 2.13 noise rating (NR) curves graphical representation of noise rating as defined in
49、ISO 1996-1 2.14 sound reduction index a measure of the sound-insulating properties of a material or building element NOTESound reduction index is further defined in BS 2750-3. 2.15 weighted sound reduction index single-number quantity of airborne sound-insulating properties of a material or interior building element NOTEWeighted sound reduction index is further defined in BS 5821-1. 2.16 standardized level difference sound level difference between rooms adjusted as define
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