GB 12142-2007 PDF in English
GB 12142-2007 (GB12142-2007) PDF English
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB 12142-2007 | English | 115 |
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Safety requirements for portable metal ladders
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| GB 12142-1989 | English | 359 |
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Safety standard for light-metal extension ladders
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Standards related to (historical): GB 12142-2007
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GB 12142-2007: PDF in English GB 12142-2007
ICS 13.100
C 68
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB 12142-1989 and GB 7059.3-1986
Safety Requirements for Portable Metal
Ladders
ISSUED ON. JUNE 26, 2007
IMPLEMENTED ON. FEBRUARY 1, 2008
Jointly issued by. The General Administration of Quality Supervision,
Inspection and Quarantine (AQSIQ) and The
Standardization Administration Committee (SAC) of the
People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 General ... 6
5 Structural Requirements for Extension Ladder and Single Ladder ... 7
6 Structural Requirements for Stepladder ... 9
7 Structural Requirements for Combination Ladder ... 10
8 Operating Requirements ... 11
9 Test Requirements for Extension Ladder and Single Ladder ... 15
10 Test Requirements for Stepladder ... 28
11 Test Requirements for Combination Ladder ... 39
12 Marking ... 40
References and Original Chinese Documents ... 42
Foreword
The provisions of all chapters, except chapters 1, 2 and 3, shall be compulsory in
this Standard.
This Standard is the combination of revision to GB 12142-1989 "Safety Standard for
Light-metal Extension Ladders" and GB 7059.3-1986 "Safety Standard for Light Metals
Portable Stepladder".
This Standard replaces GB 12142-1989 "Safety Standard for Light-metal Extension
Ladders" and GB 7059.3-1986 "Safety Standard for Light Metals Portable Stepladder".
Compared with GB 12142-1989 "Safety Standard for Light-metal Extension Ladders"
and GB 7059.3-1986 "Safety Standard for Light Metals Portable Stepladder", this Standard
has the major technical differences as follows.
-Extend the application scope of the Standard, cover the safety requirements for
two-section extension ladder, stepladder, as well as three-section extension ladder, single
ladder and combination ladder;
-Add the normal load grading for ladders and the structure performance requirements
corresponding to normal load;
-Add metal fitting load test requirements, rung torsion test requirements, stile cantilever
bending test requirements and stile cantilever drop test requirements for extension ladder and
single ladder;
-Add the following test requirements for stepladder. stile bending test requirement, step
(or rung) and stile shear strength test requirements, torsional stability test requirements,
transverse pull test requirements, front and back stile cantilever bending test requirements,
front and back stile cantilever drop test requirements and stile torsion and spreader test
requirements;
-Cancel the horizontal bending test requirement for stepladder;
-Make full revision to other contents on structural requirement, operating requirement
and test requirement.
This Standard is proposed by the State Administration of Work Safety.
This Standard is under the jurisdiction of the National Technical Committee 288 on
Safety Production of Standardization Administration of China (SAC/TC 288).
Drafting organizations. Jilin Academy of Safety Science and Technology, ChangChun
University of Technology and Suzhou Baofu Light Industry Product Co., Ltd.
Chief drafting staffs. Xiao Jianmin, Zheng Fanying, Qu Sheng, Han Lianying and Lu
Xiongying
All previously replaced editions hereof are as.
-GB 12142-1989;
-GB 7059.3-1986.
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Safety Requirements for Portable Metal Ladders
1 Scope
This Standard specifies design/manufacturing safety requirements, test requirements, safe
operation requirements and others for portable metal ladders.
This Standard is applicable to portable metal extension ladder (two-section or
three-section extension ladders), portable metal single ladder, portable metal stepladder and
portable metal combination ladder used on production activities.
2 Normative References
The provisions of following documents, through reference of this Standard, constitute
provisions of this Standard. For those documents which are dated, neither their subsequent
amendment (excluding correction) nor their revision applies to this Standard. However, the
parties who enter into agreement according to these specifications are encouraged to research
whether the latest edition of the document is applicable. For those documents which are
undated, the latest edition of the normative document is applicable.
GB/T 17889.1 Ladder - Part 1. Terms, Types and Function Dimensions
3 Terms and Definitions
For the purposes of this Standard, the following terms and definitions and the ones given
in GB/T 17889.1 apply.
3.1
Portable metal extension ladder
Portable leaning ladder formed by two or three sections, whose length is adjustable and
primary components (stile and step/rung) are made by metallic material
3.2
Portable metal single ladder (straight ladder)
Portable leaning ladder formed by only a section, whose length is non-adjustable and
primary components (stile and step/rung) are made by metallic material
3.3
Portable metal stepladder
Working length
The length measured (along the stile) from the ladder bottom supporting point to the top
supporting point when the ladder is in the predetermined operation state
3.15
Maximum working length (maximum extension length)
The working length of an extension ladder when its extensible sections are extended to
the maximum place (keeping the required minimal lap)
3.16
Highest standing level
The vertical distance from the supporting plane (ladder bottom) to the highest step (or
rung) that the user is allowable to ascend to in the predetermined state
3.17
Inside clear width
The distance measured (parallel to the step / rung) between flanges on two stile of a
ladder
3.18
Normal load
The maximum load (including weights of ascender, and carried materials and tools) that a
ladder can bear in the predetermined operation condition
3.19
Test failure
Visible failure to ladder structure or component(s) due to test(s), including corrugation,
distortion, shearing, tearing or breakdown
3.20
Ultimate failure
Severe failure to ladder structure or component(s) due to test, which causes that the
ladder structure or component(s) due cannot work properly
3.21
Visible damage
Failure that can be distinguished and identified clearly by visual check
4 General
4.1 Normal Load
Portable metal ladders shall be able to bear a normal load not less than 90kg and
identified by the normal load. By load bearing capacity, normal loads of ladders may be
classified as four classes. 90kg, 100kg, 110kg and 135kg.
4.2 Corrosion Resistance
Ladders shall be made of corrosion-resistant material as much as possible; otherwise,
they shall be applied with anti-corrosion treatment.
4.3 Exposed Metal Surface
Exposed metal surface of a ladder shall be free of sharp edge, burr and other structural
defect.
rung shall be larger than 20mm.
6.4 Stepladder Inclination Angle
6.4.1 When a stepladder (front ladder section) separates to the working position, the
inclination angle of the font section shall not be larger than 73° and the one of the back
section shall not be larger than 80°.
6.4.2 When trestle ladder or accommodation ladder separates to the working position, the
inclination angle of the stile shall not be larger than 77°.
6.5 Step (or Rung) Connection
When the stepladder is in working position, the steps (or rung) shall be kept horizontal
and parallel with each other (allowable tolerance < = 3mm). When step (or rung) and stile are
connected by fasteners, at least one fastener shall penetrate out of the front of each side stile,
and at least one fastener shall penetrate out of the back of each side stile. Step (or rung) on
bottom side shall be used with bracing reinforcer or equivalent reinforcing piece.
6.6 Ladder Tip
At least fasteners penetrate through each side of front stile so that the ladder tip is fixed
up. The mode of fastening the back ladder foot to the tip shall enable the hinge rotate flexibly.
6.7 Gantry
The fixing of a gantry as a part of stepladder shall enable gantry to fold upward when the
stepladder is folded up. When the ladder is 2.4m or shorter, the gantry structure shall enable it
to be folded up before the ladder is folded, or to be folded with the ladder simultaneously; the
gantry shall extend to the stile facing towards the user when ladder folding.
6.8 Stepladder Back
The back transv...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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