TB/T 3122-2019 English PDF (TBT3122-2019)

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TB/T 3122-2019: Acoustic elements of railway sound barrier
TB/T 3122-2019
RAILWAY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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 
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
GB/T 14402 Reaction to fire tests for building materials and products -
Determination of the heat of combustion
GB/T 15227 Test method of air permeability, watertightness, wind load resistance
performance for curtain walls
GB/T 16422.1 Plastics - Methods of exposure to laboratory light sources - Part 1:
General guidance
GB/T 16422.2 Plastics - Methods of exposure to laboratory light sources - Part 2:
Xenon-arc sources
GB/T 17748-2016 Aluminium-plastic composite panel for curtain wall
GB/T 19889.3 Acoustics - Measurement of sound insulation in buildings and of
building elements - Part 3: Laboratory measurements of airborne sound insulation
of building elements
GB/T 20247 Acoustics - Measurement of sound absorption in a reverberation room
GB/T 20284 Single burning item test for building materials and products
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
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.
4.3 Impact resistance
The acoustic elements of the sound barrier shall be able to withstand the impact of 30 J
± 1 J energy. After testing according to 5.4, it shall meet the following requirements:
a) The damage is limited to the surface portion of the structure; the internal
components do not cause damage or translational faults;
b) The impact steel ball shall not penetrate the outer wall of the cavity member; but
it allows a local damage in crack shape, which has a length of less than 50 mm;
c) On the surface of brittle materials, crater-like local damage may present, but the
depth of the crater shall be less than 20 mm. When the thickness of the outer wall
is less than 20 mm, the depth of the crater shall be less than the thickness of the
outer wall.
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.
4.7 Waterproof performance
The waterproof performance of the acoustic elements of the sound barrier is expressed
by the hydrophobicity rate of the sound absorbing material; the limited value standard
hydrophobicity rate is greater than or equal to 98%.
4.8 Appearance
actual situation.
5.4 Impact resistance
5.4.1 Carry out the impact resistance test of acoustic elements of sound barrier,
according to method A in GB/T 14153-1993.
5.4.2 The test device and test method for the impact resistance of the acoustic elements
of the sound barrier shall comply with the relevant provisions in GB/T 14153-1993.
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
5.10.1 The transmittance shall be tested, according to the test method of GB/T 2410.
5.10.2 The performance retention rate shall be tested, according to the test methods of
GB/T 16422.1 and GB/T 16422.2.
5.10.3 The tensile strength and elongation at break shall be tested, according to the test
method of GB/T 1040.1.
5.10.4 The bending strength shall be tested, according to the test method of GB/T 9341.
5.10.5 The elastic modulus shall be tested, according to the test method of GB/T 1041.
5.10.6 The coefficient of linear thermal expansion shall be tested, according to the test