JG/T 398-2019 (JG/T 398-2012) PDF English
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JG
CONSTRUCTION INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.060
Q 70/79
The grouting coupler for rebars splicing
Issued on: OCTOBER 29, 2012
Implemented on: JANUARY 1, 2013
Issued by. Ministry of Housing and Urban-Rural Development of the
People’s Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification and types... 6
5 Requirements... 9
6 Test method... 11
7 Inspection rules... 13
8 Marking, packaging, transportation and storage... 14
Annex A (Informative) The grouting coupler – Product quality certificate... 17
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by the Institute of Standards and Quotas of the Ministry
of Housing and Urban-Rural Development of the People’s Republic of China.
This Standard shall be under the jurisdiction of the Standardization Technical
Committee on Construction Structure of the Ministry of Housing and Urban-Rural
Development.
The drafting organizations of this Standard. China Academy of Building Research,
Guangxi Construction Group Second Construction Engineering Co., Ltd., Beijing
Yugou Co., Ltd., Langfang CABR Construction Machinery Technology Co., Ltd.,
Central Research Institute of Building and Construction Co., Ltd., CABR Technology
Co., Ltd., Zhongtai Construction Group Co., Ltd., Beijing Building Construction
Research Institute Co., Ltd., Peifeng Construction Engineering (Shanghai) Co. Ltd.,
Zhejiang Construction Engineering Co., Ltd. and Baoye Group Zhejiang Construction
Industry Institute Co., Ltd..
The main drafters of this Standard. Liu Zijin, Ye Tong, Jiang Qinjian, Zhao Hongxue,
Qian Guanlong, Chang Weihua, Zhang Mingli, Li Daning, Zhang Xinzhong, Cai
Cangkui, Jin Rui, Yu Yachao and Liang Hao.
The grouting coupler for rebars splicing
1 Scope
This Standard specifies the terms and definitions, classification and types,
requirements, test method, inspection rules and marking, packaging, transportation
and storage of the grouting coupler for rebars splicing (hereinafter referred to as the
grouting coupler).
This Standard applies to the coupler for grouting and splicing hot-rolled ribbed or
remained heat treatment rebars of the diameter 12 mm to 40 mm in reinforced concrete.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced document (including any
amendments) applies to this Standard.
GB/T 197 General Purpose Metric Screw Threads – Tolerances
GB/T 228.1 Metallic materials – Tensile testing – Part 1.Method of test at room
temperature
GB/T 231.1 Metallic materials – Brinell hardness test – Part 1.Test method
GB/T 699 Quality carbon structural steels
GB/T 1348 Spheroidal graphite iron castings
GB/T 1499.2 Steel for the reinforcement of concrete – Part 2.Hot rolled ribbed
bars
GB/T 1591 High strength low alloy structural steels
GB/T 2975 Steel and steel products – Location and preparation of test pieces for
mechanical testing
GB/T 3077 Alloy structure steels
GB/T 8162 Seamless steel tubes for structural purposes
GB/T 9174 General specification for transport packages of general cargo
GB/T 9441 Metallographic test for spheroidal graphite cast iron
GB/T 13014 Remained heat treatment ribbed steel bars for the reinforcement of
concrete
GB/T 13298 Inspection methods of microstructure for metals
JGJ 107 Technical specification for mechanical splicing of steel reinforcing bars
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
the grouting coupler
the metal coupler for splicing of rebars through the force transferring impact of cement-
based grouting material, which is usually made by the casting process or mechanical
process
3.2
the whole grouting coupler
the grouting coupler which splices rebars by grouting at both ends of the splice
3.3
the grouting coupler with half thread end
the grouting coupler with one end of the splice spliced by grouting and the other end
spliced by non-grouting; the other end is usually spliced by thread
3.4
the grouting coupler with directly rolling thread end
the grouting coupler with half thread end with the non-grouting splicing end of the splice
splicing rebars by directly rolling thread end
3.5
the grouting coupler with rolling thread end after stripping rib
the grouting coupler with half thread end with the non-grouting splicing end of the splice
by rib-stripped rolling straight thread
3.6
the grouting coupler with thread end after upsetting
b) the first type change of the grouting coupler with rolling thread end after stripping
rib, which is made by mechanical processing and splices rebars of standard yield
strength 500 MPa and diameter 36 for the grouting end or 32 mm for the non-
grouting end, is expressed as. GTJB5 36/32A.
5 Requirements
5.1 General provisions
5.1.1 The production of the grouting coupler shall meet the requirements of product
design.
5.1.2 The design of yield bearing capacity and tensile bearing capacity, after
reckoning in the maximum negative tolerances at the positions of the middle of the
whole grouting coupler and the discharging hole of the grouting coupler with half
threaded end, is specified in JGJ 107.
5.1.3 The length of the grouting coupler shall be decided by tests and the length of
the grouting splicing end is preferably not less than 8 times of the diameter of rebars;
the length of installation and adjustment of rebars shall be reserved on both sides of
the middle axial anchor point, not less than 10 mm for the prefabricated end and not
less than 20 mm for the on-site assembly end.
5.1.4 The number of shear slots shall meet the specifications of Table 1; the axial
thickness of the boss on both sides of shear slots shall not be less than 2 mm.
Table 1 Numbers of shear slots
Diameter of rebars spliced/mm 12 to 20 22 to 32 36 to 40
Number of shear slots/nos ≥ 3 ≥ 4 ≥ 5
5.1.5 The wall thickness of the grouting coupler mechanically processed shall not be
less than 3 mm; the wall thickness of the grouting coupler cast shall not be less than 4
mm.
5.1.6 The diameter of the through-hole at the splice of the threaded end and the
grouting end of the grouting coupler with half threaded end is preferably not too large;
the difference between the minor diameter of thread and the diameter of through-hole
shall not be less than 2 mm; the length of through-hole shall not be less than 3 mm.
5.2 Material properties
5.2.1 The grouting coupler cast is preferably made of spheroidal graphite cast iron;
the grouting coupler mechanically processed is preferably made of quality carbon
structural steel, high strength low alloy structural steel, alloy structural steel or other
steels which are verified by the splice type test and conform to the requirements.
5.2.2 For the grouting coupler made of spheroidal graphite cast iron, its material shall
the anchorage section and nominal
diameter of rebars/mm
7 Accuracy of straight thread - Grade H in GB/T 197
5.4 Appearance
5.4.1 The inner and outer surfaces of the grouting coupler shall be free from quality
defects which are adverse to its usability, such as slag inclusions, cold shuts, sand
holes, shrinkage holes and cracks.
5.4.2 The surface of the grouting coupler mechanically processed shall be free from
cracks or other defects adverse to the properties of the splice; the edges of the end
surfaces and outer surfaces shall be free from sharp corners and burrs.
5.4.3 The outer surface of the grouting coupler shall be marked legibly.
5.4.4 The surface of the grouting coupler shall be free from rust.
5.5 Mechanical properties
The grouting coupler shall be used in conjunction with the grouting material; the tensile
strength of the rebars splice spliced with the grouting coupler shall meet the
specifications of the splice of grade I in JGJ 107.
6 Test method
6.1 Material properties
6.1.1 Mechanical properties
The yield strength, tensile strength and percentage elongation after fracture of the main
testing materials.
6.1.1.1 For the material properties of the grouting coupler cast, use the separately
cast test block method for sampling; for the material properties of the grouting coupler
mechanically processed, use the raw materials for sampling.
6.1.1.2 Preparation of test pieces
For the test pieces of casting materials, use the separately cast test blocks; the
preparation of test pieces is specified in GB/T 1348.The sampling and sample
preparation for round steel or steel are specified in GB/T 2975.
6.1.1.3 Test method
It is specified in GB/T 228.1.
6.1.2 Rate of spheroidization
...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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