TB/T 2344.1-2020Rail - Part 1: 43kg/m ~ 75kg/m rails (English PDF)
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Issued by
Ministry of Railways of the People’s Republic of China
Level / Type
National · Recommended
Issue date
February 24, 1998
Implementation date
September 1, 1998
Scope
TB/T 2344.1-2020 (Rail - Part 1: 43kg/m ~ 75kg/m rails) is available as an English-translated PDF.
TB/T 2344.1-2020 — This Standard specifies the technical requirements, inspection rules and transportation, storage of sub-ballast for ballast bed of railways (hereinafter referred to as sub-ballast).
This Standard applies to national railways; local railways and industrial enterprise railways may also refer to this Standard.
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Document preview — TB/T 2344.1-2020
National Standard of the People's Republic of China
Issued by: Ministry of Railways of the People’s Republic of China
Contents
- Foreword...3
- 1 Scope...4
- 2 References...4
- 3 Terms...4
- 4 Technical requirements...4
- 5 Inspection rules...6
- 6 Transportation, storage...8
Foreword
Sub-ballast is an important part of the ballast bed of railways and is located between
the ballast layer of the ballast bed and the surface layer of the subgrade bed. It plays
the role of transmitting and distributing the train loads, preventing mutual penetration
of top-ballast and surface layer particles of subgrade bed, water seepage transition
and antifreeze-and-insulation. In the past, China borrowed the experience of using
river sands as sub-ballast from the former Soviet Union. Since there is no material
standard, the above-mentioned functions of the sub-ballast cannot be guaranteed and
the material source of the sub-ballast is limited. On the basis of reference to the
relevant standards such as the sub-ballast material standards of the United States
Railway Engineering Association (AREA), Japan railway subgrade bed surface layer
(JISA5001 particle size transitional gravel layer) material standards, combining China's
national conditions and railway situation, this Standard is developed.
This Standard is proposed by Railway Engineering Research Institute of China
Academy of Railway Sciences.
This Standard is under the jurisdiction of Institute of Standard Metrology of National
Railway Administration of the People's Republic of China.
Railway Engineering Research Institute of China Academy of Railway Sciences is
responsible for the drafting of this Standard.
Main drafters of this Standard. Zeng Shugu, Zhang Wensheng, Xu Yongxian, Wang
Hong, Liu Zengjie.
Sub-ballast for ballast bed of railways
1 Scope
This Standard specifies the technical requirements, inspection rules and transportation,
storage of sub-ballast for ballast bed of railways (hereinafter referred to as sub-ballast).
This Standard applies to national railways; local railways and industrial enterprise
railways may also refer to this Standard.
2 References
The following standards contain provisions which, through reference in this text,
constitute provisions of this standard. At time of publication, the editions indicated were
valid. All standards are subject to revision, and parties to agreements based on this
standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below.
TB/T 2140-90 Railway ballast
TB/T 2328.1~18-92 Test method for railway ballast
3 Terms
The plasticity index Ip. the plasticity index is equal to the difference between the liquid
limit LL and the plastic limit PL.
4 Technical requirements
4.1 Sub-ballast material may be taken from natural gravel material, or may be taken
from rocks or natural pebbles, gravels by crushing, screening.
4.3 The mass percentage of particles with broken surface in coarse particles with a
particle size greater than 16 mm is not less than 30 %.
4.4 Properties of sub-ballast material
4.4.1 The Los Angeles abrasion ratio of aggregates with a particle size greater than
1.7 mm is not more than 50 %.
5 Inspection rules
Sub-ballast material shall be subjected to type inspection and production inspection.
The type inspection is a ministerial level, and the production inspection is a bureau
level.
5.1 Type inspection
5.2 Production inspection
5.2.2 According to the requirements of 4.2 to 4.4, the production organization carries
out an inspection when every 4 × 104 m3 of sub-ballast are produced. If the annual
output is less than 4 × 104 m3, the inspection shall be carried out once a year.
5.3 Test methods
5.3.1 The Los Angeles abrasion ratio test shall be in accordance with TB/T 2328.1.
5.3.2 The sodium sulfate solution soaking loss test shall be in accordance with TB/T
2328.10.
5.3.3 The liquid limit and plasticity index test shall be in accordance with TB/T 2328.8
and TB/T 2328.9.
5.3.4 The granular soil and other impurities content test shall be in accordance with
TB/T 2328.17.
6 Transportation, storage
6.1 In the stockpile site, it shall prevent the infiltration of clay, debris and dust, and
ensure that the sub-ballasts are clean. When shoveling, it shall prevent the shoveling
of soil.
TB/T 2897-1998
TB
PROFESSIONAL STANDARD OF
THE PEOPLE'S REPUBLIC OF CHINA
Sub-ballast for ballast bed of railways
Issued on. FEBRUARY 24, 1998
Implemented on. SEPTEMBER 1, 1998
Issued by. Ministry of Railways of the People's Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 References... 4
3 Terms... 4
4 Technical requirements... 4
5 Inspection rules... 6
6 Transportation, storage... 8
Foreword
Sub-ballast is an important part of the ballast bed of railways and is located between
the ballast layer of the ballast bed and the surface layer of the subgrade bed. It plays
the role of transmitting and distributing the train loads, preventing mutual penetration
of top-ballast and surface layer particles of subgrade bed, water seepage transition
and antifreeze-and-insulation. In the past, China borrowed the experience of using
river sands as sub-ballast from the former Soviet Union. Since there is no material
standard, the above-mentioned functions of the sub-ballast cannot be guaranteed and
the material source of the sub-ballast is limited. On the basis of reference to the
relevant standards such as the sub-ballast material standards of the United States
Railway Engineering Association (AREA), Japan railway subgrade bed surface layer
(JISA5001 particle size transitional gravel layer) material standards, combining China's
national conditions and railway situation, this Standard is developed.
This Standard is proposed by Railway Engineering Research Institute of China
Academy of Railway Sciences.
This Standard is under the jurisdiction of Institute of Standard Metrology of National
Railway Administration of the People's Republic of China.
Railway Engineering Research Institute of China Academy of Railway Sciences is
responsible for the drafting of this Standard.
Main drafters of this Standard. Zeng Shugu, Zhang Wensheng, Xu Yongxian, Wang
Hong, Liu Zengjie.
Sub-ballast for ballast bed of railways
1 Scope
This Standard specifies the technical requirements, inspection rules and transportation,
storage of sub-ballast for ballast bed of railways (hereinafter referred to as sub-ballast).
This Standard applies to national railways; local railways and industrial enterprise
railways may also refer to this Standard.
2 References
The following standards contain provisions which, through reference in this text,
constitute provisions of this standard. At time of publication, the editions indicated were
valid. All standards are subject to revision, and parties to agreements based on this
standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below.
TB/T 2140-90 Railway ballast
TB/T 2328.1~18-92 Test method for railway ballast
3 Terms
The plasticity index Ip. the plasticity index is equal to the difference between the liquid
limit LL and the plastic limit PL.
4 Technical requirements
4.1 Sub-ballast material may be taken from natural gravel material, or may be taken
from rocks or natural pebbles, gravels by crushing, screening.
4.3 The mass percentage of particles with broken surface in coarse particles with a
particle size greater than 16 mm is not less than 30 %.
4.4 Properties of sub-ballast material
4.4.1 The Los Angeles abrasion ratio of aggregates with a particle size greater than
1.7 mm is not more than 50 %.
5 Inspection rules
Sub-ballast material shall be subjected to type inspection and production inspection.
The type inspection is a ministerial level, and the production inspection is a bureau
level.
5.1 Type inspection
5.2 Production inspection
5.2.2 According to the requirements of 4.2 to 4.4, the production organization carries
out an inspection when every 4 × 104 m3 of sub-ballast are produced. If the annual
output is less than 4 × 104 m3, the inspection shall be carried out once a year.
5.3 Test methods
5.3.1 The Los Angeles abrasion ratio test shall be in accordance with TB/T 2328.1.
5.3.2 The sodium sulfate solution soaking loss test shall be in accordance with TB/T
2328.10.
5.3.3 The liquid limit and plasticity index test shall be in accordance with TB/T 2328.8
and TB/T 2328.9.
5.3.4 The granular soil and other impurities content test shall be in accordance with
TB/T 2328.17.
6 Transportation, storage
6.1 In the stockpile site, it shall prevent the infiltration of clay, debris and dust, and
ensure that the sub-ballasts are clean. When shoveling, it shall prevent the shoveling
of soil.
......
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.
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