TB/T 3122-2019 PDF English
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Acoustic elements of railway sound barrier
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Technique requirements and measurement of acoustic elements of railway sound barrier
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TB/T 3122-2019: Acoustic elements of railway sound barrier---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/TBT3122-2019
RAILWAY INDUSTRY STANDARD
ICS 45.020
S 09
Replacing TB/T 3122-2010
Acoustic elements of railway sound barrier
Issued on. MARCH 25, 2019
Implemented on. OCTOBER 01, 2019
Issued by. National Railway Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Technical requirements... 7
5 Inspection methods... 9
6 Inspection rules... 11
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces TB/T 3122-2010 "Technique requirements and measurement of
acoustic elements of railway sound barrier". Compared with TB/T 3122-2010, the main
technical changes of this standard are as follows.
- MODIFY the requirements for acoustic performance, providing the requirements
for sound absorption and sound insulation performance of acoustic elements, by
frequency division (see 4.1; 4.1 of the 2010 edition);
- MODIFY the fireproof performance requirements and inspection methods (see 4.4
and 5.5; 4.4 and 5.5 of the 2010 edition);
- MODIFY the requirements and inspection methods for anti-corrosion performance
(see 4.5 and 5.6; 4.5 and 5.6 of the 2010 edition);
- ADD the requirements and inspection methods for waterproof performance of
acoustic elements of sound barriers (see 4.7 and 5.8);
- ADD the performance retention rate requirements and inspection methods, for
organic synthetic transparent panel acoustic elements (see 4.9 and 5.10).
This standard shall be under the jurisdiction of the Institute of Energy Conservation,
Environmental Protection, Labor and Sanitation of China Academy of Railway
Sciences Group Co., Ltd.
The drafting organizations of this standard. Energy Conservation, Environmental
Protection, Labor and Sanitation Research Institute of China Railway Research Institute
Group Co., Ltd., China Railway Economic Planning Research Institute Co., Ltd., China
Railway Design Group Co., Ltd.
The main drafters of this standard. Yin Hao, Shui Chunyu, Song Jun, Guo Huaiyong,
Ni Guangbin, Xue Linhai, Ma Aiying, Liu Shuo, Hong Wei, Lv Dongmei.
This standard replaces the standard previously issued as follows. TB/T 3122-2005,
TB/T 3122-2010.
Acoustic elements of railway sound barrier
1 Scope
This standard specifies terms and definitions, technical requirements, inspection
methods, inspection rules for acoustic elements of railway sound barriers.
This standard applies to the design, manufacture, product inspection of acoustic
elements of railway sound barriers.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 1036 Test method for coefficient of linear thermal expansion of plastics
between -30 °C and 30 °C with a vitreous silica dilatometer
GB/T 1040.1 Plastics - Determination of tensile properties - Part 1.General
principles
GB/T 1041 Plastics - Determination of compressive properties
GB/T 1633 Plastics - Thermoplastic materials - Determination of Virat softening
temperature (VST)
GB/T 2410 Determination of the luminous transmittance and haze of transparent
plastics
GB/T 3947-1996 Acoustic terminology
GB/T 5464 Non-combustibility test method for building materials
GB 8624-2012 Classification for burning behavior of building materials and
products
GB/T 8626 Test method of flammability for building materials
GB/T 9341 Plastics - Determination of flexural properties
GB/T 10299 Test method for hydrophobic nature of thermal insulation
GB/T 14153-1993 General rule of test method for impact resistance of rigid plastics
by means of falling weight
3 Terms and definitions
The terms and definitions, which are defined in GB/T 3947-1996, as well as the
following terms and definitions, apply to this document. For ease of use, some terms
and definitions in GB/T 3947-1996 are repeated below.
3.1
Railway sound barrier
A structure, which is built on both sides of a railway line, to reduce the impact of
train running noise on the acoustic environment.
3.2
Acoustic elements of sound barrier
A unit in a sound barrier, that functions as sound insulation and/or sound absorption.
3.3
Sound absorption coefficient
The ratio -- of the sum of the sound power, which is absorbed by the interface
(surface) or medium, plus the sound power, which is transmitted through the
interface (wall or partition, etc.), TO the incident sound power, at a given frequency
and condition. In general, the measurement conditions and frequencies shall be
explained. The sound absorption coefficient is equal to the sum of the loss
coefficient and the transmission coefficient.
[GB/T 3947-1996, definition 12.38]
3.4
Noise reduction coefficient
The arithmetic mean of sound absorption coefficients, which are measured at 250
Hz, 500 Hz, 1000 Hz, 2000 Hz, etc. It is calculated to two decimal places; the last
digit takes 0 or 5.
[GB/T 3947-1996, definition 12.43]
4 Technical requirements
4.1 Acoustic performance
The sound absorption performance of a sound barrier's acoustic element is characterized
by its noise reduction coefficient and sound absorption coefficient towards the sound
source side. The sound insulation performance of sound barrier's acoustic elements is
characterized by weighted sound reduction index and sound reduction index. It shall
meet the following requirements.
4.2 Wind pressure resistance
The wind pressure resistance performance of the acoustic elements of the sound barrier
shall be evaluated, based on the requirements that it shall not occur functional
impairment, residual deformation or damage; that the maximum elastic deflection shall
not exceed LA/100 (wherein LA is the maximum free length of the acoustic element of
sound barrier, the same below); that the residual deformation shall not exceed LA/500.
4.4 Fireproof performance
The acoustic elements of organic synthetic transparent panels shall meet the
requirements of grade B2 and above in GB 8624-2012.
4.5 Corrosion resistance
The anti-corrosion performance of metal materials in acoustic elements of sound
barriers is represented by salt spray resistance or coating adhesion. Salt spray resistance
and coating adhesion shall meet the requirements in GB/T 17748-2016.The salt spray
resistance grade is less than or equal to grade 1; the coating adhesion is grade 0.
4.6 Fatigue resistance
Anti-fatigue tests shall be carried out, on the acoustic elements of sound barriers, on
railway lines where the train's design running speed is over 200 km/h. After the anti-
fatigue test is carried out, according to the test method of 5.7, there shall be no internal
and external structural damage, such as. cracks, panel damage, bonding failure,
hardware loosening and other functional disturbances.
5 Inspection methods
5.1 Sound absorption
The test device, test method, specimen preparation for the sound absorption of acoustic
elements of sound barrier shall comply with the relevant provisions in GB/T 20247.
5.2 Sound reduction
The test device, test method, specimen preparation for the sound reduction of acoustic
elements of sound barrier shall comply with the relevant provisions in GB/T 19889.3.
5.4 Impact resistance
5.5 Fireproof performance
Test according to the corresponding test methods, in GB/T 8626, GB/T 20284, GB/T
14402, GB/T 5464.
5.6 Corrosion resistance
Test according to the test method in GB/T 17748-2016.
5.7 Fatigue resistance
Calculate the fatigue load, according to different materials, operating flow, operating
speed; use a fatigue testing machine to perform 4 x 106 fatigue cycle tests, under
sinusoidal cyclic load and vibration frequency of 4 Hz.
5.8 Waterproof performance
Test according to the test method of GB/T 10299.
5.9 Appearance
Visual inspection is carried out, under bright light conditions or under 40 W fluorescent
lamps.
5.10 Properties of organic synthetic transparent plates
6 Inspection rules
6.1 Exit-factory inspection
The product shall be inspected before leaving the factory, AND accompanied with an
exit-factory inspection certificate. The exit-factory inspection only checks the
appearance.
6.2 Type inspection
The items and methods of type inspection are as shown in Table 3.Type inspection of
the product shall be carried out, in the following cases.
TB/T 3122-2019
RAILWAY INDUSTRY STANDARD
ICS 45.020
S 09
Replacing TB/T 3122-2010
Acoustic elements of railway sound barrier
Issued on. MARCH 25, 2019
Implemented on. OCTOBER 01, 2019
Issued by. National Railway Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Technical requirements... 7
5 Inspection methods... 9
6 Inspection rules... 11
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces TB/T 3122-2010 "Technique requirements and measurement of
acoustic elements of railway sound barrier". Compared with TB/T 3122-2010, the main
technical changes of this standard are as follows.
- MODIFY the requirements for acoustic performance, providing the requirements
for sound absorption and sound insulation performance of acoustic elements, by
frequency division (see 4.1; 4.1 of the 2010 edition);
- MODIFY the fireproof performance requirements and inspection methods (see 4.4
and 5.5; 4.4 and 5.5 of the 2010 edition);
- MODIFY the requirements and inspection methods for anti-corrosion performance
(see 4.5 and 5.6; 4.5 and 5.6 of the 2010 edition);
- ADD the requirements and inspection methods for waterproof performance of
acoustic elements of sound barriers (see 4.7 and 5.8);
- ADD the performance retention rate requirements and inspection methods, for
organic synthetic transparent panel acoustic elements (see 4.9 and 5.10).
This standard shall be under the jurisdiction of the Institute of Energy Conservation,
Environmental Protection, Labor and Sanitation of China Academy of Railway
Sciences Group Co., Ltd.
The drafting organizations of this standard. Energy Conservation, Environmental
Protection, Labor and Sanitation Research Institute of China Railway Research Institute
Group Co., Ltd., China Railway Economic Planning Research Institute Co., Ltd., China
Railway Design Group Co., Ltd.
The main drafters of this standard. Yin Hao, Shui Chunyu, Song Jun, Guo Huaiyong,
Ni Guangbin, Xue Linhai, Ma Aiying, Liu Shuo, Hong Wei, Lv Dongmei.
This standard replaces the standard previously issued as follows. TB/T 3122-2005,
TB/T 3122-2010.
Acoustic elements of railway sound barrier
1 Scope
This standard specifies terms and definitions, technical requirements, inspection
methods, inspection rules for acoustic elements of railway sound barriers.
This standard applies to the design, manufacture, product inspection of acoustic
elements of railway sound barriers.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 1036 Test method for coefficient of linear thermal expansion of plastics
between -30 °C and 30 °C with a vitreous silica dilatometer
GB/T 1040.1 Plastics - Determination of tensile properties - Part 1.General
principles
GB/T 1041 Plastics - Determination of compressive properties
GB/T 1633 Plastics - Thermoplastic materials - Determination of Virat softening
temperature (VST)
GB/T 2410 Determination of the luminous transmittance and haze of transparent
plastics
GB/T 3947-1996 Acoustic terminology
GB/T 5464 Non-combustibility test method for building materials
GB 8624-2012 Classification for burning behavior of building materials and
products
GB/T 8626 Test method of flammability for building materials
GB/T 9341 Plastics - Determination of flexural properties
GB/T 10299 Test method for hydrophobic nature of thermal insulation
GB/T 14153-1993 General rule of test method for impact resistance of rigid plastics
by means of falling weight
3 Terms and definitions
The terms and definitions, which are defined in GB/T 3947-1996, as well as the
following terms and definitions, apply to this document. For ease of use, some terms
and definitions in GB/T 3947-1996 are repeated below.
3.1
Railway sound barrier
A structure, which is built on both sides of a railway line, to reduce the impact of
train running noise on the acoustic environment.
3.2
Acoustic elements of sound barrier
A unit in a sound barrier, that functions as sound insulation and/or sound absorption.
3.3
Sound absorption coefficient
The ratio -- of the sum of the sound power, which is absorbed by the interface
(surface) or medium, plus the sound power, which is transmitted through the
interface (wall or partition, etc.), TO the incident sound power, at a given frequency
and condition. In general, the measurement conditions and frequencies shall be
explained. The sound absorption coefficient is equal to the sum of the loss
coefficient and the transmission coefficient.
[GB/T 3947-1996, definition 12.38]
3.4
Noise reduction coefficient
The arithmetic mean of sound absorption coefficients, which are measured at 250
Hz, 500 Hz, 1000 Hz, 2000 Hz, etc. It is calculated to two decimal places; the last
digit takes 0 or 5.
[GB/T 3947-1996, definition 12.43]
4 Technical requirements
4.1 Acoustic performance
The sound absorption performance of a sound barrier's acoustic element is characterized
by its noise reduction coefficient and sound absorption coefficient towards the sound
source side. The sound insulation performance of sound barrier's acoustic elements is
characterized by weighted sound reduction index and sound reduction index. It shall
meet the following requirements.
4.2 Wind pressure resistance
The wind pressure resistance performance of the acoustic elements of the sound barrier
shall be evaluated, based on the requirements that it shall not occur functional
impairment, residual deformation or damage; that the maximum elastic deflection shall
not exceed LA/100 (wherein LA is the maximum free length of the acoustic element of
sound barrier, the same below); that the residual deformation shall not exceed LA/500.
4.4 Fireproof performance
The acoustic elements of organic synthetic transparent panels shall meet the
requirements of grade B2 and above in GB 8624-2012.
4.5 Corrosion resistance
The anti-corrosion performance of metal materials in acoustic elements of sound
barriers is represented by salt spray resistance or coating adhesion. Salt spray resistance
and coating adhesion shall meet the requirements in GB/T 17748-2016.The salt spray
resistance grade is less than or equal to grade 1; the coating adhesion is grade 0.
4.6 Fatigue resistance
Anti-fatigue tests shall be carried out, on the acoustic elements of sound barriers, on
railway lines where the train's design running speed is over 200 km/h. After the anti-
fatigue test is carried out, according to the test method of 5.7, there shall be no internal
and external structural damage, such as. cracks, panel damage, bonding failure,
hardware loosening and other functional disturbances.
5 Inspection methods
5.1 Sound absorption
The test device, test method, specimen preparation for the sound absorption of acoustic
elements of sound barrier shall comply with the relevant provisions in GB/T 20247.
5.2 Sound reduction
The test device, test method, specimen preparation for the sound reduction of acoustic
elements of sound barrier shall comply with the relevant provisions in GB/T 19889.3.
5.4 Impact resistance
5.5 Fireproof performance
Test according to the corresponding test methods, in GB/T 8626, GB/T 20284, GB/T
14402, GB/T 5464.
5.6 Corrosion resistance
Test according to the test method in GB/T 17748-2016.
5.7 Fatigue resistance
Calculate the fatigue load, according to different materials, operating flow, operating
speed; use a fatigue testing machine to perform 4 x 106 fatigue cycle tests, under
sinusoidal cyclic load and vibration frequency of 4 Hz.
5.8 Waterproof performance
Test according to the test method of GB/T 10299.
5.9 Appearance
Visual inspection is carried out, under bright light conditions or under 40 W fluorescent
lamps.
5.10 Properties of organic synthetic transparent plates
6 Inspection rules
6.1 Exit-factory inspection
The product shall be inspected before leaving the factory, AND accompanied with an
exit-factory inspection certificate. The exit-factory inspection only checks the
appearance.
6.2 Type inspection
The items and methods of type inspection are as shown in Table 3.Type inspection of
the product shall be carried out, in the following cases.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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