This specification applies to laboratory and on-site sound insulation measurements of airborne sound and impact sound in buildings. GBJ 75-1984 Specification for Sound Insulation Measurement of Buildings GBJ75-1984 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for Building Sound Insulation Measurement
GBJ75-84
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for Building Sound Insulation Measurement
GBJ75-84
Editor: Tong
Approval Department: State Planning Commission of the People's Republic of China Effective Date: 19
Month 1
Engineering Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of "Building Sound Insulation Measurement Code" Jibiao [1984] No. 2592
According to the requirements of the former State Construction Commission (81) Jianfa Shezi No. 546, the "Building Sound Insulation Measurement Code" compiled by Tongji University, which is organized by the National Acoustic Standardization Technical Committee, has been reviewed by the plenary meeting of the National Acoustic Standardization Technical Committee. The "Building Sound Insulation Measurement Code" GBJ75-84 is now approved as a national standard and will be implemented on June 1, 1985.
Tongji University is responsible for the specific interpretation of this code. State Planning Commission
December 17, 1984
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Preparation Instructions
This specification is based on the requirements of the former National Capital Construction Commission (81) Jianfa Shezi No. 546 document, and is organized by the National Acoustic Standardization Technical Committee, and specifically prepared by Tongji University.
In the preparation of this specification, the specification preparation team carefully summarized the experience of domestic building sound insulation testing since the promulgation of the "SC4.1 Sound Insulation Test Specification (Trial)" (1964) approved by the National Science and Technology Commission Acoustic Testing Base, and analyzed and verified the international standard ISO140I-VI "Sound Insulation Measurement of Houses and House Components" issued by the International Organization for Standardization, and proposed the first draft of the specification and sent it to relevant units across the country for comments. Finally, it was reviewed and finalized by the plenary meeting of the National Acoustic Standardization Technical Committee. This specification is divided into six chapters and seven appendices. The main contents include: general principles, laboratory measurement of airborne sound insulation of building components, on-site measurement of airborne sound insulation between two rooms in a building, on-site measurement of airborne sound insulation of exterior wall components and exterior walls, laboratory measurement of floor impact sound insulation, and on-site measurement of floor impact sound insulation. During the implementation of this specification, all units are advised to accumulate information and summarize experience. If any modification or supplement is found, please send your opinions and relevant information to our school for reference in future revisions.
Tongji University
August 1984
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Chapter 1 General
Chapter 2 Laboratory Measurement of Airborne Sound Insulation of Building ComponentsSection 1
General Provisions
Section 2 Test Quantities and Calculation Quantities
Section 3 Laboratory and Test Pieces
Section 4 Experimental Methods and Calculations
Section 5
Result Expression
Chapter 3
Field Measurement of Airborne Sound Insulation between Two Rooms in a BuildingSection 1
Section 2
Section 3
Section 4
Section 5
General ProvisionsbZxz.net
Test Quantities and Calculation Quantities
Experimental Arrangement.|| tt||Experimental methods and calculations
Expression of results
Chapter 4 On-site measurement of airborne sound insulation of exterior wall components and exterior wall surfacesSection 1
General provisions
Section 2 Traffic noise measurement sound insulation
Section 3 Loudspeaker noise measurement sound insulation
Chapter 5 Laboratory measurement of floor impact sound insulationSection 1
General provisions·
Section 2 Test quantities and calculation quantities·
Section 3 Laboratory and test pieces
Section 4 Experimental methods and calculations
Section 5 Expression of results
Chapter 6 On-site measurement of floor impact sound insulationSection 1
General provisions:
Section 2 Test quantities and calculation quantities
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Section 3． Experimental Arrangement
Section 4 Experimental Methods and Calculations
Section 5 Expression of Results·
Appendix—
Appendix 2
Appendix 3
Appendix 4
Appendix 5
Appendix 6
Glossary
Precision and Precision Requirements of Measurement Results, Measurement of Lateral Transmission of Airborne Sound
Measurement of Lateral Transmission of Impact Sound
On-site Measurement of Airborne Sound Insulation of External Wall Components by the “Open-Close” Method
Location of Loudspeakers when Measuring Airborne Sound Insulation of External Walls 4l
Explanation of Terms Used in This Code·
Appendix 7
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Engineering Construction Standards Full-text Information System
Main Symbols
Dar tr
Sound pressure level difference
Standard sound pressure level difference
Standard sound pressure level difference when measuring exterior wall sound insulation with traffic noiseEquivalent sound pressure level
Impact sound pressure level
Normalized impact sound pressure level
Normalized impact sound pressure level without ground treatmentStandardized impact sound pressure level
Improvement of impact sound insulation
Average sound pressure level in the room
Average surface velocity level on the test piece
Effective (root mean square) sound pressure||tt ||Reference sound pressure
Sound insulation, sound transmission loss
Apparent sound insulation, apparent sound transmission loss
Sound insulation when sound waves are incident on the test piece from 6 anglesExternal wall sound insulation measured with traffic noise
Effective (root mean square) value of normal surface velocity at a certain position of the test pieceReference velocity
Spatial average value of the square of the normal surface velocitySound power (steady-state value)
Sound power radiated by component K
Sound absorption of the receiving room
A. Benchmark sound absorption of receiving room
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Full-text information system of engineering construction standards
Test piece area
Reverberation time of receiving room
Benchmark reverberation time
Integration time
Volume of receiving room
Sound speed in air
Number of measuring points
Repetition rate
Positive square root of variance
Standard deviation
Air density
Characteristic impedance of air
Radiation efficiency
Loss factor
Angle of incidence of sound wave
Degree of freedom (=n-1)
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Chapter 1 General Provisions
Article 1.0.1 This specification is formulated to unify the measurement methods and conditions of airborne sound and impact sound insulation in laboratories and on-site, so that the sound insulation performance of the same component measured is as close as possible, with a unified basis for mutual comparison, and to facilitate the design of building sound insulation.
Article 1.0.2 This specification is applicable to laboratory and on-site sound insulation measurements of airborne sound and impact sound in buildings.
Article 1.0.3 In addition to implementing this specification, building sound insulation measurements shall also comply with relevant national standards and specifications in force.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Laboratory Measurement of Airborne Sound Insulation of Building Components Section 1 General Provisions
Article 2.1.1 This chapter applies to laboratory measurements of airborne sound insulation of walls, floors, doors and windows of buildings.
Article 2.1.2 Laboratory measurements of airborne sound insulation of building components shall achieve the following objectives:
1. It shall be able to provide comparable and repeatable experimental data for the sound insulation design of building components;
2. It shall be able to classify building components according to their sound insulation characteristics. Section 2 Test Quantity and Calculation Quantity
Article 2.2.1 The average sound pressure level in the room shall be calculated as follows: 1 yuan
10g100
L,——average sound pressure level in the room (dB), (reference sound pressure P. Take 20 micropascals);
Ln—sound pressure level at the i-th measuring point in the room (dB); n
number of measuring points.
Article 2.2.2 The sound insulation shall be calculated as follows: W
R=101gw,
W1 is the sound power incident on the test piece (watts); W2 is the sound power transmitted through the test piece (watts). Note: Wi and W2 should be steady-state values.
(2.2.2—1)
If the sound field is diffuse and the sound is transmitted only through the test piece, the sound insulation of random incidence should be calculated as follows:
R=Lp1-Lp2+101g
Wherein R——sound insulation (dB);
Lp1——average sound pressure level in the sound source room (dB); Lp2——average sound pressure level in the receiving room (dB); (2.2.2—2)
S——test piece area (m2), generally equal to the test piece hole area; S——sound absorption of the receiving room (m2).
Note: If the sound field is not completely diffuse, the calculated value of the formula should be an approximate result. Article 2.2.3
The apparent sound insulation shall be calculated as follows:
R' =101g w.
W—the apparent sound insulation (dB);
W—the sound power incident on the test piece (W); W: the total sound power transmitted to the receiving room (W) (2.2.3-1)
Note: The total sound power Ws transmitted to the receiving room is usually composed of the following parts of sound power: ①The sound power directly transmitted to the partition wall and radiated directly from the partition wall (Wna); ②The sound power directly transmitted to the partition wall but radiated by the lateral structure (WD); The sound power transmitted to the lateral structure but radiated directly from the partition wall (Wra); ④The sound power transmitted to the lateral structure and radiated from the lateral structure (Wpr); ③The sound power transmitted through loopholes, ventilation pipes, etc. (as air sound) (W). If the sound fields in the two rooms are diffuse, the apparent sound insulation should be calculated according to the following formula: R' =Lp1-Lp2+101g %
Section 3 Laboratory and Test Specimens
(2.2.3-2)
Article 2.3.1 The laboratory should consist of two connected reverberation chambers; there should be a hole between the two reverberation chambers for installing the test specimen. The rooms in the laboratory should meet the following requirements:
1. The volume of the test room should not be less than 50m3, the volume and shape of the two rooms should not be exactly the same, and the difference in volume should not be less than 10%; Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2. The ratio of room size should be reasonably selected, and no two of the sizes should be equal, nor should they be in an integer ratio;
3. When necessary, diffusers should be installed in both test rooms: 4. The ambient noise in the receiving room should be low enough, and the output power of the sound source room and the sound insulation of the test piece to be installed in the laboratory should be estimated; 5. In the experimental device for measuring sound insulation, any indirect sound transmission can be ignored compared with the sound transmission through the test piece. However, effective vibration isolation measures should be taken for the structure between the sound source room and the receiving room, and a lining wall that reduces sound radiation should be covered on the entire surface of the two rooms;
6. The low-frequency reverberation time of the receiving room should be controlled at about 2 seconds. Article 2.3.2 The opening of the test piece shall meet the following requirements: 1. The area of ​​the test piece wall shall be 10 square meters, and the area of ​​the test piece floor shall be 10 to 20 square meters. The short side length of the wall and the floor shall not be less than 2.3 meters; Note: When the wavelength of the free bending wave of the lowest frequency considered is less than half of the minimum size of the test piece, the test piece may be of a smaller size.
2. Windows, doors and similar components may be of a smaller size. The opening of the test piece for the door shall be the same as the conditions in the actual building, and its lower position shall be close to the floor of the laboratory.
3. The layout of the test piece opening shall make the normal connection and sealing condition of the test piece between its periphery and the wall panel as similar as possible to the actual structural form. Its installation conditions shall be stated in the test report.
Article 2.3.3 The partition wall specimens shall meet the following requirements: 1. The specimen size shall be determined according to the specimen opening size specified in Article 2.3.2 of this Code,
2. The location of the specimen installed in the opening between the sound source room and the receiving room shall be stated,
3. In a laboratory with suppressed lateral structural sound radiation, the sound transmission of any non-direct path can be ignored compared with the sound transmission through the specimen. Note: ① For the laboratory itself, the maximum apparent sound insulation value should be measured. The specific method is to install two high sound insulation structures in the specimen opening and measure their apparent sound insulation value. If the sound insulation characteristics of this structure are further improved, the apparent sound insulation engineering construction standard full-text information system
W.bzsoso.coI2. The size of the test piece opening is determined according to the provisions of Article 2.
2. The location of the test piece installed in the opening between the sound source room and the receiving room should be explained.
3. In a laboratory with a structure that suppresses lateral structural sound radiation, the sound transmission of any non-direct path can be ignored compared with the sound transmission through the test piece. Note: ① For the laboratory itself, the maximum value of its apparent sound insulation should be measured. The specific method is to install two high sound insulation structures in the test piece opening and measure its apparent sound insulation. If the sound insulation characteristics of this structure are further improved, the apparent sound insulation engineering construction standard full text information system
W.bzsoso.coI2. The size of the test piece opening is determined according to the provisions of Article 2.
2. The location of the test piece installed in the opening between the sound source room and the receiving room should be explained.
3. In a laboratory with a structure that suppresses lateral structural sound radiation, the sound transmission of any non-direct path can be ignored compared with the sound transmission through the test piece. Note: ① For the laboratory itself, the maximum value of its apparent sound insulation should be measured. The specific method is to install two high sound insulation structures in the test piece opening and measure its apparent sound insulation. If the sound insulation characteristics of this structure are further improved, the apparent sound insulation engineering construction standard full text information system
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