GBJ 121-1988 Building Sound Insulation Evaluation Standard GBJ121-88 GBJ121-1988 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Evaluation Standard for Building Sound Insulation
GBJ121—88
1988
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Evaluation Standard for Building Sound Insulation
GBJ121—88
Editor Department:
Approval Department:
Effective Date:
Engineering Construction Standards Full Text Information System
Office of the Capital Planning and Construction Committee
State Planning Commission of the People's Republic of China December 1, 1988
Engineering Construction Standards Full Text Information System
Notice on the Release of "Building Sound Insulation Evaluation Standard" Jibiao [1988] No. 494
According to the requirements of the State Planning Commission's Jizong [1985] No. 1 document, the "Building Sound Insulation Evaluation Standard" compiled by the Beijing Architectural Design Institute and relevant units has been reviewed by relevant departments. The "Building Sound Insulation Evaluation Standard" GBJ121-88 is now approved as a national standard and will be implemented from December 1, 1988.
This standard is managed by the Office of the Capital Planning and Construction Committee. The Beijing Architectural Design Institute is responsible for the specific interpretation work. The China Planning Press is responsible for publishing and distributing it. State Planning Commission
March 31, 1988
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Preparation Instructions
This standard is organized by the National Acoustic Standardization Technical Committee in accordance with the requirements of Document No. 1 of the State Planning Commission [1985], and is specifically responsible for the Beijing Architectural Design Institute, in conjunction with relevant units.
During the preparation of this standard, the standard preparation team collected the actual sound insulation data of various design, scientific research and teaching units in my country, summarized and analyzed them, and proposed a draft standard for soliciting opinions based on the international standard ISO717/1, 2, 3-1982 "Acoustics-Sound Insulation Evaluation of Buildings and Building Components" issued by the International Organization for Standardization, and widely solicited opinions from relevant units across the country. Finally, it was reviewed and finalized at the plenary meeting of the National Acoustic Standardization Technical Committee. Www.bzxZ.net
This standard is divided into three chapters and three appendices. Its main contents include general principles, single-value evaluation quantities of airborne sound insulation and single-value evaluation quantities of impact sound insulation. During the implementation of this standard, each unit is advised to accumulate data and summarize experience. If any modification or supplement is found, please send your opinions and relevant information to Beijing Institute of Architectural Design (Nanlishi Road, Beijing) for reference during revision. Office of Capital Planning and Construction Committee
February 8, 1988
Engineering Construction Standards Full-text Information System
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Chapter 1 General
Chapter 2
Chapter 3
Appendix—
Appendix 2
Appendix 3
Single-value evaluation quantity of airborne sound insulation
Single-value evaluation quantity of impact sound insulation
Octave band measurement results Single-value evaluation quantity of the result
Evaluation method of weighted impact sound improvement of floor surface layer Explanation of terms used in this standard
Additional explanation
Engineering Construction Standard Full-text Information System
: (1)
Engineering Construction Standard Full-text Information System
Chapter 1 General
Article 1.0.1 This standard is formulated to convert the airborne sound and impact sound insulation measurement results of buildings and building components into single-value evaluation quantities to facilitate the mutual comparison of sound insulation performance and building sound insulation design.
Article 1.0.2 This standard is applicable to the single-value evaluation of airborne sound and impact sound insulation of buildings and building components.
Article 1.0.3 When evaluating the airborne sound and impact sound insulation of buildings and building components in accordance with this standard, the original data used must be the various sound insulation quantities, sound pressure level differences and impact sound pressure levels measured in accordance with the "Code for Measurement of Building Sound Insulation" GBJ75-84. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Single Value Evaluation Quantity of Airborne Sound Insulation Single value evaluation quantity of airborne sound insulation shall be determined by comparison method Article 2.0.1
Article 2.0.2
2.0.2.
The reference curve characteristics for evaluating airborne sound insulation shall comply with the reference curve characteristics table of airborne sound insulation
Reference value
Reference value
It is usually advisable to draw the reference curve on transparent coordinate paper (Figure 2.0.2) for easy comparison. The comparison method used for the single-value evaluation of airborne sound insulation shall comply with the following provisions of Article 2.0.3: 1. Arrange the measured sound insulation values ​​(R, Rt, Re, Re switch, R') and sound pressure level difference (D, Dnr, Dn,t) of each 1/3 octave band to a value accurate to 0.5 dB and draw a curve on the coordinate paper. 2. Cover the transparent paper with the same coordinate ratio and the reference curve on the coordinate paper with the above curve, so that the horizontal axes overlap and align with each other. 3. Move the reference curve towards the measured curve until the total number of unfavorable deviations (the number of decibels that the measured curve on a certain frequency band is smaller than the reference curve) is as large as possible, but not exceeding 32.0dB, or the total number of unfavorable deviations has not yet reached 32.0dB, but the unfavorable deviation in a certain frequency band has reached 8.0dB. When calculating, the favorable deviation (the number of decibels that the measured curve on a frequency band is larger than the reference curve) shall not offset the unfavorable deviation. 4. At this time, the whole decibel number of the ordinate on the coordinate paper where the measured curve is drawn, corresponding to the OdB line on the reference curve, is the airborne sound insulation evaluation value of the measured object. When the OdB line does not correspond to a whole decibel number, the whole decibel number corresponding to the +0.5dB line shall be used as the airborne sound insulation evaluation value of the measured object. Article 2.0.4 For the airborne sound insulation evaluation value obtained by the comparison method specified in this standard, its name shall be preceded by the word "weighted" in front of the name of its corresponding sound insulation value or sound pressure level difference. The symbols shall be followed by a subscript w (Rw, Rtr.wRe,w, Reswitch,w, Rw, Dw, DnT,w, DaTtr,w). The units shall all be decibels.
Article 2.0.5 The evaluation of airborne sound insulation may also adopt other measures equivalent to the comparison method specified in this standard.
Article 2.0.6 The measurement results shall be given in the form of a chart in accordance with the provisions of Chapters 2, 3 and 4 of the Code for Measurement of Building Sound Insulation. The last shifted position of the reference curve shall also be plotted on this chart. The name and value of the airborne sound insulation evaluation quantity shall be given in a prominent position.
Note: When there are only octave band airborne sound insulation measurement values, the evaluation method may be carried out in accordance with Appendix 1 of this standard.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 3 Single Value Evaluation Quantity of Impact Sound Insulation Article 3.0.1 Single value evaluation quantity of impact sound insulation shall be determined by comparison method.
The reference curve characteristics for evaluating impact sound insulation shall comply with the provisions of Table 30.2
3.0.2.
Reference Curve Characteristics Table of Impact Sound Insulation
Reference Value
Reference Value
It is usually advisable to draw the reference curve on transparent coordinate paper (Figure 3.0.2) for easy comparison.
Article 3.0.3 The comparison method used for the single-value evaluation of impact sound insulation shall comply with the following provisions:
, organize the measured impact sound pressure level values ​​(Lpm, L\pmr) of each 1/3 octave band into values ​​accurate to 0.5dB, and draw a curve on the coordinate paper. 2. Cover the transparent paper with the same coordinate ratio and the reference curve on the coordinate paper with the above curve, so that the horizontal coordinates overlap and align with each other. B
OdB/0ct
Figure 3.0.2 Characteristic curve of reference curve of impact sound insulation 2000
3. Move the reference curve towards the measured curve until the total amount of adverse deviation (the decibel number of the measured curve in a certain frequency band greater than the reference curve) is as large as possible, but not exceeding 32.0dB, or the total amount of adverse deviation has not yet reached 32.0dB, but the adverse deviation in a certain frequency band has reached 8.00dB. The favorable deviation (the decibel number of the curve measured on a certain frequency band that is smaller than the reference curve) shall not offset the unfavorable deviation during calculation. 4. At this time, the whole decibel number of the ordinate on the coordinate paper where the measured curve is drawn, corresponding to the OdB line on the reference curve, is the impact sound insulation evaluation value of the measured object. When the OdB line does not correspond to a whole decibel number, the whole decibel number corresponding to the 0.5dB line shall be used as the impact sound insulation evaluation value of the measured object. Article 3.0.4 For any impact sound insulation evaluation value obtained by the comparison method specified in this standard, its name shall be preceded by the word "weighted" before the name of its corresponding impact sound pressure level. Its symbol shall be followed by a subscript w (LpnW, LpnTw) after its corresponding symbol. Its unit shall be decibel.
Article 3.0.5 The evaluation of impact sound insulation may also adopt other measures equivalent to the comparison method specified in this standard.
Article 3.0.6 The measurement results shall be given in the form of charts in accordance with the provisions of Chapters 5 and 6 of the (Code for Measurement of Building Sound Insulation). The final position of the reference curve shall also be drawn on this chart. The name and value of the impact sound insulation evaluation quantity shall be given in a prominent position.
Note: ① When only the impact sound pressure level measurement value of the octave band is available, the evaluation method may be carried out in accordance with Appendix 1 of this standard. ② The evaluation of the improvement of the floor surface impact sound shall be carried out in accordance with the provisions of Appendix 2 of this standard. Engineering Construction Standard Full-text Information System
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