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HJ 2.4-2021 English PDF

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US$1409.00 · In stock
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HJ 2.4-2021: Technical guidelines for noise impact assessment
Status: Valid

HJ 2.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
HJ 2.4-2021	1409	Add to Cart	8 days	Technical guidelines for noise impact assessment	Valid
HJ 2.4-2009	RFQ	ASK	7 days	Technical guidelines for noise impact assessment	Obsolete
HJ/T 2.4-1995	RFQ	ASK	6 days	Technical Guidelines for Noise Impact Assessment	Obsolete

Similar standards

GB/T 24021 HJ 630 GB/T 23384 HJ 2.3 HJ 2.2 HJ 2.1

Basic data

Standard ID: HJ 2.4-2021 (HJ2.4-2021)
Description (Translated English): Technical guidelines for noise impact assessment
Sector / Industry: Environmental Protection Industry Standard
Classification of Chinese Standard: Z00
Word Count Estimation: 62,626
Issuing agency(ies): Ministry of Ecology and Environment

HJ 2.4-2021: Technical guidelines for noise impact assessment

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Technical Guidelines for Environmental Impact Assessment Acoustic Environment) National Ecological Environment Standard of the People's Republic of China In lieu of HJ 2.4-2009 Technical Guidelines for Environmental Impact Assessment Acoustic Environment Technical guidelines for noise impact assessment This electronic version is the official standard text, which is reviewed and typeset by the Environmental Standards Institute of the Ministry of Ecology and Environment. Published on 2021-12-24 2022-07-01 Implementation Released by the Ministry of Ecology and Environment directory Foreword...ii 1 Scope...1 2 Normative references...1 3 Terms and Definitions...1 4 General...4 5 Evaluation level, evaluation scope and evaluation standard...7 6 Noise source investigation and analysis...8 7 Investigation and evaluation of the status quo of the acoustic environment...8 8 Prediction and Evaluation of Acoustic Environmental Impact...10 9 Noise prevention countermeasures...12 10 Noise Monitoring Program...13 11 Acoustic Environmental Impact Assessment Conclusions and Recommendations...13 12 Requirements for acoustic environmental impact assessment forms for construction projects... 13 13 Requirements for acoustic environmental impact assessment in planning environmental impact assessment...14 Appendix A (Normative Appendix) Attenuation of Outdoor Sound Transmission...15 Appendix B (Normative Appendix) Typical Industry Noise Prediction Model...26 Appendix C (Informative Appendix) Noise Impact Prediction of Typical Construction Projects and Countermeasures for Prevention and Control...45 Appendix D (informative appendix) Requirements for the acoustic environmental impact assessment form for construction projects...50 Appendix E (informative appendix) Self-inspection table for acoustic environmental impact assessment...59 Technical Guidelines for Environmental Impact Assessment Acoustic Environment

1 Scope of application

This standard specifies the general principles, contents, procedures, methods and requirements for acoustic environmental impact assessment. This standard applies to the acoustic environmental impact assessment of construction projects. The planned acoustic environmental impact assessment can be used for reference.

2 Normative references

This standard refers to the following documents or clauses thereof. For dated references, only the dated version applies to this standard. For undated references, the latest edition (including all amendments) applies to this standard. GB 3096 Acoustic Environment Quality Standard GB 9660 Environmental Standard for Aircraft Noise Around Airports GB 9661 Measurement method of aircraft noise around airports GB 12348 Industrial Enterprise Boundary Environmental Noise Emission Standard GB 12523 Environmental Noise Emission Standard for Construction Sites GB 12525 Railway boundary noise limit and its measurement method GB 22337 Noise Emission Standard for Social Living Environment GB/T 17247.1 Acoustic Outdoor Sound Propagation Attenuation Part 1.Calculation of Atmospheric Sound Absorption GB/T 17247.2 Acoustic Outdoor Sound Propagation Attenuation Part 2.General Calculation Method HJ/T 90 Specification for Acoustic Design and Measurement of Sound Barriers HJ 884 Technical Guidelines for Pollution Source Intensity Accounting JTG B01 Highway Engineering Technical Standard

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 noise Sounds that interfere with the surrounding living environment generated in industrial production, building construction, transportation and social life (frequency between 20 Hz and 20 kHz audible range). 3.2 stationary sound source A sound source whose position does not move within the sounding time. 3.3 mobile sound source A sound source whose position moves according to a certain trajectory during the sounding time. 3.4 point sound source A sound source that radiates sound waves in the form of spherical waves, and the sound pressure amplitude of the radiated sound waves is inversely proportional to the sound wave propagation distance. sound sources of any shape, only If the wavelength of the sound wave is much larger than the geometric size of the sound source, the sound source can be regarded as a point sound source. 3.5 line sound source For a sound source that radiates sound waves in the form of cylindrical waves, the sound pressure amplitude of the radiated sound waves is inversely proportional to the square root of the sound wave propagation distance. 3.6 area sound source A sound source that radiates sound waves in the form of plane waves, and the sound pressure amplitude of the radiated sound waves does not change with the propagation distance. 3.7 noise protection target Buildings and building clusters that need to be kept quiet in accordance with laws, regulations, standard policies, etc. 3.8 equivalent continuous A-weighted sound pressure level The average energy value of the A sound level during the specified measurement time T, using Aeq,TL means, the unit is dB. By definition, the equivalent continuous A sound level is expressed as. 0.1 Aeq 10lg 10d        , TL t (1) In the formula. Aeq,TL - equivalent continuous A sound level, dB; AL -- instantaneous A sound level at time t, dB; T--specified measurement time period, s. 3.9 background noise value The sound level affected by the sound source of the construction project itself is not included in the evaluation scope. 3.10 noise contribution value The sound level produced by the construction project's own sound source at the predicted point. Noise contribution value ( eqgL) is calculated as. 0.1 eqg 10lg 10i Lt         (2) In the formula. eqgL -- noise contribution value, dB; T -- time period for forecast calculation, s; it -- the running time of the i sound source in the T period, s; AiL - The equivalent continuous A sound level produced by the i sound source at the predicted point, dB. 3.11 noise prediction value The contribution value and background value of the predicted point are calculated by the energy superposition method. Noise prediction ( eqL) is calculated as.  eqg eqb0.1 0.1eq 10lg 10 10L LL   (3) In the formula. eqL - the noise prediction value of the prediction point, dB;

4 General

4.1 Basic tasks Evaluate the changes in acoustic environment quality caused by the implementation of construction projects; propose reasonable and feasible prevention and control measures to reduce noise impact; Evaluate the feasibility of construction project implementation from the perspective of acoustic environmental impact; optimize site selection, route selection, rational layout and land space for construction projects The plan provides a scientific basis. 4.2 Evaluation Category 4.2.1 According to the type of sound source, it can be divided into the environmental impact assessment of fixed sound source and mobile sound source. 4.2.2 If the construction project includes both fixed sound sources and mobile sound sources, the sound environmental impact assessment shall be carried out separately; When affected by fixed sound sources and moving sound sources (excluding aircraft noise at airports), the evaluation shall be carried out after superimposing the environmental impact. 4.3 Evaluation volume 4.3.1 Sound source intensity The evaluation quantity of sound source intensity is. A-weighted sound power level (LAw) or octave band sound power level (Lw), if necessary, the sound source direction should be included A-weighted sound pressure level [LA(r)] or octave band sound pressure level [Lp(r)] at a distance r from the sound source, including a sound source directivity description if necessary; Effective perceived noise level (LEPN). 4.3.2 Sound environment quality According to GB 3096, the sound environment quality evaluation measures are the equivalent A sound level (Ld) during the daytime, the equivalent A sound level (Ln) at night, and the sudden noise level at night. Sound is evaluated as the maximum A sound level (LAmax). According to GB 9660 and GB 9661, the area around the airport is affected by the noise of aircraft passing (take-off, landing, low-altitude fly-over) The quantity is the Weighted Equivalent Continuous Perceived Noise Level (LWECPN). 4.3.3 Factory boundary, field boundary and boundary noise According to GB 12348, the boundary noise evaluation quantities of industrial enterprises are the equivalent A sound level (Ld) during the daytime, the equivalent A sound level (Ln) at night, and the The evaluation quantity of intermittent and occasional noise is the maximum A sound level (LAmax). According to GB 12523, the noise evaluation quantities at the construction site are daytime equivalent A sound level (Ld), nighttime equivalent A sound level (Ln), and nighttime equivalent sound level A (Ln). The maximum A sound level (LAmax) in between. According to GB 12525, the railway boundary noise evaluation quantity is daytime equivalent A sound level (Ld), nighttime equivalent A sound level (Ln). According to GB 22337, the boundary noise evaluation quantities of social life noise emission sources are the equivalent A sound level (Ld) in the daytime and the equivalent A sound level at night. (Ln), the evaluation quantity of non-stationary noise is the maximum A sound level (LAmax). 4.3.4 Train passing noise, aircraft passing noise The noise impact assessment of a single train of railway and urban rail transit is the equivalent continuous A sound level ( pAeq T L,), single frame The noise impact assessment measure for aircraft passing through is the maximum A sound level (LAmax). 4.4 Working procedure The working procedure of acoustic environmental impact assessment is shown in Figure 1. 5 Evaluation Grade, Evaluation Scope and Evaluation Criteria 5.1 Evaluation level 5.1.1 The sound environmental impact assessment work level is generally divided into three levels, the first level is a detailed evaluation, the second level is a general evaluation, and the third level is a brief evaluation. price. 5.1.2 Within the scope of evaluation, there are functional areas applicable to Class 0 acoustic environment specified in GB 3096, or within the scope of the evaluation before and after construction of the project. When the target noise level increment for environmental protection is more than 5 dB(A) (excluding 5 dB(A)), or the number of affected population increases significantly, it shall be evaluated according to Level 1. price. 5.1.3 The acoustic environment functional area where the construction project is located is the Class 1 and Class 2 areas specified in GB 3096, or the pre- and post-construction evaluation range of the construction project. The target noise level increment for environmental protection in the surrounding area reaches 3 dB(A) to 5 dB(A), or when the number of people affected by noise increases a lot, it shall be rated as Class II. price. 5.1.4 The acoustic environment functional area where the construction project is located is the Class 3 and Class 4 areas specified in GB 3096, or the pre- and post-construction evaluation range. When the target noise level increment for environmental protection in the surrounding area is below 3 dB(A) (excluding 3 dB(A)), and the number of affected population does not change much, press Three-level evaluation. 5.1.5 When determining the evaluation level, if the construction project conforms to the division principle of two levels, it shall be evaluated according to the higher level. 5.1.6 The aircraft noise impact assessment level for airport construction projects is Level 1. 5.2 Scope of evaluation 5.2.1 For construction projects with fixed sound sources (such as factories, docks, stations, etc.). a) To meet the requirements of the first-level evaluation, generally the evaluation scope is.200 m outward from the boundary of the construction project; b) The scope of the second-level and third-level evaluation can be based on the category of the acoustic environment functional area and the purpose of acoustic environmental protection in the area where the construction project is located and adjacent areas. The actual situation such as the bid is appropriately reduced; c) If the contribution value calculated based on the sound source of the construction project reaches.200 m and still cannot meet the standard value of the corresponding functional area, the assessment should be The valence range is expanded to meet the distance of the standard value. 5.2.2 For construction projects mainly based on mobile sound sources (such as highways, urban roads, railways, urban rail transit and other ground transportation). a) To meet the requirements of the first-level evaluation, the evaluation scope is generally within.200 m on both sides of the line centerline; b) The scope of the second-level and third-level evaluation can be based on the category of the acoustic environment functional area and the purpose of acoustic environmental protection in the area where the construction project is located and adjacent areas. The actual situation such as the bid is appropriately reduced; c) If the contribution value calculated based on the sound source of the construction project reaches.200 m and still cannot meet the standard value of the corresponding functional area, the assessment should be The valence range is expanded to meet the distance of the standard value. 5.2.3 The scope of noise assessment for airport projects is determined as follows. a) The airport project is divided into the evaluation scope according to the flight volume undertaken by each runway. for a single runway project, the overall throughput of the airport is used. and take-off and landing sorties to determine the scope of airport noise assessment. For multi-runway airports, each runway is subject to different flight volumes. Self-define the scope of airport noise assessment and take a collection. 1) For a single-runway airport, the airport noise assessment scope should be a rectangular area formed by a certain distance at both ends of the airport runway and on both sides; 2) For multi-runway airports in which all runways are in parallel configuration, the scope of airport noise assessment should be the extension of each runway by a certain distance. The rectangular range formed by the farthest range after; 3) For multi-runway airports with intersecting configuration, the scope of airport noise assessment should be the combination of parallel runways (groups) and intersecting runways. set range. b) For adding runway items or changing runway location items (for example, an existing runway becomes a taxiway or a new runway is built), in the current state In airport noise impact assessment and expansion airport noise impact assessment, the scope of airport noise assessment can be delineated respectively; c) The scope of airport noise assessment shall not be less than the 70 dB contour line range of the weighted equivalent continuous perceived noise level; d) See Table 2 for the recommended noise assessment ranges for airports with different flight volumes. 5.3 Evaluation Criteria The acoustic environment impact assessment criteria should be determined according to the type of sound source and the type of acoustic environment functional area where the project is located. No division of sound environment function The area of the district shall adopt the standards determined by the local competent department of ecological environment.

6 Noise source investigation and analysis

6.1 Survey and Analysis Objects 6.1.1 The noise source investigation includes the main fixed sound sources and moving sound sources of the proposed project. give the number, location, and intensity of the main sound sources, and Identify the specific location of the fixed sound source or the route, runway, etc. of the moving sound source on the map of the standard specification. 6.1.2 The investigation content and working depth of noise sources shall meet the requirements of the environmental impact prediction model for noise source parameters. 6.1.3 The primary, secondary and tertiary assessments shall investigate and analyze the main noise sources of the proposed project. 6.2 Source Intensity Obtaining Method 6.2.1 The calculation of noise source intensity shall be carried out in accordance with the requirements of HJ 884, and those with industrial pollution source intensity accounting technical guidelines shall first follow the guidelines If there is no technical guideline for source intensity accounting of industrial pollution sources, but there are provisions for source intensity accounting methods in the industry guideline, priority shall be given to the method specified in Follow the methods specified in the industry guidelines. 6.2.2 For the noise source intensity of the proposed project, when the required data is lacking, the sound source analogy can be used to measure or cite effective data and research results. fruit to determine. The analogy conditions should be given when using the sound source analogy measurement. 6.2.3 The parameters, data format and precision to be obtained from the noise source shall meet the input requirements of the environmental impact prediction model.

7 Investigation and evaluation of the status quo of the acoustic environment

7.1 Primary and secondary evaluation 7.1.1 Name, geographical location, administrative division, functional area of acoustic environment, different acoustic environment targets within the scope of investigation and evaluation The population distribution in the environmental function area, the spatial relationship with the construction project, the construction situation, etc. 7.1.2 The status quo of the acoustic environment quality of the representative acoustic environmental protection targets within the assessment scope requires on-site monitoring, and the remaining acoustic environmental protection The current status of the target acoustic environment quality can be calculated by analogy or on-site monitoring combined with the model. 7.1.3 Name, type, quantity, location, source intensity, etc. of the current sound sources with obvious influence within the scope of investigation and evaluation. Current situation within the scope of the evaluation The sound source intensity investigation shall be determined by on-site monitoring method or data collection method. Analyze the composition and influence of current sound sources, and make suggestions on the results of the current survey Do an evaluation. 7.2 Level 3 Evaluation 7.2.1 Name, geographical location, administrative division, functional area of acoustic environment, different acoustic environment targets within the scope of investigation and evaluation The population distribution in the environmental function area, the spatial relationship with the construction project, the construction situation, etc. 7.2.2 Investigate the status quo of the acoustic environment quality of the representative acoustic environmental protection targets within the assessment scope, and use the existing monitoring data. If there is no monitoring data, representative acoustic environmental protection targets can be selected for on-site monitoring, and the composition of the current sound sources can be analyzed. 7.3 Investigation method of the status quo......

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Question 5: Should I purchase the latest version HJ 2.4-2021?

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