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JG/T 163-2013 English PDF (JGT163-2013)

JG/T 163-2013 English PDF (JGT163-2013)

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JG/T 163-2013: Couplers for rebar mechanical splicing

This Standard stipulates the terms, definitions, classification, types and marking, requirements, test methods, inspection rules, mark, packaging, transportation and storage of couplers for rebar mechanical splicing.
JG/T 163-2013
CONSTRUCTION INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 93.020
P 25
Replacing JG 163-2004, JG 171-2005
Couplers for Rebar Mechanical Splicing
ISSUED ON: APRIL 27, 2013
IMPLEMENTED ON: OCTOBER 1, 2013
Issued by: Ministry of Housing and Urban-Rural Development of the
PEOPLE Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Classification, Type and Marking ... 9
5 Requirements ... 13
6 Test Methods ... 18
7 Inspection Rules ... 21
8 Marking, Packaging, Transportation and Storage ... 26
Appendix A (normative) Table of Minimum Dimension Parameters of Parallel Threaded Couplers for Rebar Mechanical Splicing ... 29
Appendix B (normative) Test Methods of Test Piece of Splice ... 31
Appendix C (normative) Type Inspection Report of Test Piece of Splice ... 37 Appendix D (informative) Format of Product Certificate of Couplers for Rebar Mechanical Splicing ... 43
Appendix E (informative) Format of Quality Certificate of Couplers for Rebar Mechanical Splicing ... 44
Couplers for Rebar Mechanical Splicing
1 Scope
This Standard stipulates the terms, definitions, classification, types and marking, requirements, test methods, inspection rules, mark, packaging, transportation and storage of couplers for rebar mechanical splicing.
This Standard is applicable to parallel threaded coupler, taper threaded coupler and coupler for squeezing sleeve splicing of rebars for rebar mechanical splicing in concrete structure. The couplers described in this Standard are applicable to the splicing of all types of rebars with the diameter of 12 mm ~ 50 mm, which comply with the stipulations in GB 1499.2 and GB 13014. Couplers for the splicing of plain round rebars, stainless steel rebars and foreign rebars may take this Standard as a reference. 2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. 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 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 699 Quality Carbon Structural Steels
GB/T 700 Carbon Structural Steels
GB/T 702 Hot-rolled Steel Bars - Dimensions, Shape, Weight and Tolerances GB 1499.2 Steel for the Reinforcement of Concrete - Part 2: Hot Rolled Ribbed Bars GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test Pieces for Mechanical Testing
GB/T 3639 Seamless Cold-drawn or Cold-rolled Steel Tubes for Precision Applications GB/T 8162 Seamless Steel Tubes for Structural Purposes
GB/T 9174 General Specification for Transport Packages of General Cargo GB 13014 Quenching and Self-tempering Ribbed Bars for the Reinforcement of Concrete
GB/T 17395 Dimensions, Shapes, Masses and Tolerances of Seamless Steel Tubes JGJ 107 Technical Specification for Mechanical Splicing of Steel Reinforcing Bars YB/T 5222 Quality Hot Rolled and Forged Carbon Structural Steel Round Tube Blank 3 Terms and Definitions
The following term and definition are applicable to this Standard.
3.1 Rebar Mechanical Splicing
Rebar mechanical splicing refers to a splicing method which transmits force in one steel reinforcing bar to another steel rebar through the mechanical occlusion effect between the rebar and the coupler, or the load-bearing effect on the end face of the steel rebar.
3.2 Coupler
Coupler refers to steel sleeve for mechanical splicing of steel rebars; it may transmit axial tensile force or pressure of steel rebars.
3.3 Threaded Coupler
Threaded coupler refers to a coupler which may be put in threaded connection with steel rebars and has threaded inner hole.
3.4 Parallel Threaded Coupler
Parallel threaded coupler refers to threaded coupler which has parallel threaded inner hole.
3.5 Parallel Threaded Coupler for Splicing Rebars with Upsetting End
Parallel threaded coupler for splicing rebars with upsetting end refers to parallel threaded coupler which may be spliced with the upsetting end of steel rebars. 3.6 Parallel Threaded Coupler for Splicing Rebars with Rib Stripped
before Rolling of Threads
Parallel threaded coupler for splicing rebars with rib stripped before rolling of threads refers to parallel threaded coupler which may be spliced with rib stripped before rolling of threads on the end of steel rebars.
3.7 Parallel Threaded Coupler for Splicing Rebars with Threads Roll on to Rebar End
Parallel threaded coupler for splicing rebars with threads roll on to rebar end refers to parallel threaded coupler which may be spliced with threads roll on to rebar end. 3.8 Taper Threaded Coupler
Taper threaded coupler refers to a threaded coupler which may be spliced with taper threads of steel rebars and has taper threaded inner hole.
3.9 Coupler for Squeezing Sleeve Splicing of Rebars
Coupler for squeezing sleeve splicing of rebars refers to a coupler which has unthreaded inner hole and is applied to the squeezed splicing of ribbed rebars. 3.10 Standard Coupler for Parallel Threaded Splicing of Rebars
Standard coupler for parallel threaded splicing of rebars refers to a coupler which manifests the same dextral parallel thread in the full length.
3.11 Standard Coupler for Taper Threaded Splicing of Rebar
Standard coupler for taper threaded splicing of rebar refers to a coupler whose both ends manifest the same dextral taper thread.
3.12 Standard Coupler for Squeezing Sleeve Splicing of Rebars
Standard coupler for squeezing sleeve splicing of rebars refers to a coupler which manifests the same inner diameter and wall thickness for the squeezing of standard splices in the full length.
3.13 Coupler with Different Inner Diameter
Coupler with different inner diameter refers to a coupler whose inner diameters on both ends are different and are applied to the splicing of steel rebars with different diameters. 3.14 Threaded Coupler with Left and Right Hand Thread
Threaded coupler with left and right hand thread refers to a threaded coupler which has the same thread specifications but the opposite rotation directions on both ends. 3.15 Threaded Coupler with One Slope at Thread End
Threaded coupler with one slope at thread end refers to a parallel threaded coupler which has an internal chamfer for the centering of steel rebars on one end and extended length than the standard coupler.
3.16 Thread Plug Gauge
with different inner diameter, used for the splicing with Grade-500 rebars with the diameter of 20 mm / 25 mm shall be expressed in: GY 5 20 / 25.
5 Requirements
5.1 Raw Materials
5.1.1 Threaded coupler
The raw materials of threaded coupler shall comply with the following requirements: a) The raw materials of coupler should adopt (designation: No. 45) round steel, seamless steel tubes for structure, whose shape and mechanical properties shall comply with the stipulations n GB/T 699, GB/T 8162 and GB/T 17395. b) When the raw materials of coupler must adopt (designation: No. 45) cold- drawn or cold-rolled precision seamless steel tubes, annealing treatment shall be conducted and comply with the relevant stipulations in GB/T 3639; the tensile strength shall not be more than 800 MPa; the elongation after break ???5 should not be less than 14%. The raw materials of cold-drawn or cold-rolled precision seamless steel tubes of No. 45 steel shall adopt tube blank steel with the designation of No. 45 and comply with the stipulations in YB/T 5222. c) In terms of coupler which is molded through various cold-machining
processes, annealing treatment should be conducted. In addition, in the design of the coupler, the increased strength through cold machining shall not be utilized to reduce the cross-sectional area of the coupler.
d) The raw materials of coupler may select other steel products which are proved to be compliant with the stipulations of splice performance in JGJ 107 through splice type inspection.
e) In terms of coupler that needs to be welded with steel products like sectional steel, its raw materials shall comply with the requirements of weldability. 5.1.2 Coupler for squeezing
The raw materials of coupler for squeezing shall select appropriate calendering steel products in accordance with the designation of steel rebars to be spliced. Quality carbon structural steels with the designation of No. 10 and No. 20, or, carbon structural steels with the designation of Q235 and Q275 should be selected. The shapes and mechanical properties shall comply with the stipulations in GB/T 700, GB/T 702 and GB/T 8162; the actually tested mechanical properties shall comply with the stipulations in Table 1.
When coupler is applied to steel rebar splice which has requirements for fatigue performance, its fatigue resistance performance shall comply with the stipulations in JGJ 107.
5.5 Manufacture of Coupler
5.5.1 Quality control
The quality control of coupler manufacture shall comply with the following requirements: a) Manufacturing enterprise of coupler shall issue an enterprise standard which includes the content of product specifications, types, dimensions and
tolerances, quality control methods, inspection items and systems, and
disqualified product processing rules; submit it to quality and technology supervision department for reference.
b) Manufacturing enterprise of coupler should obtain valid GB/T 19001 / ISO 9001 quality management system certificate and construction engineering product certificate.
5.5.2 Inspection of products being manufactured
Inspection items of couplers being manufactured shall at least include: external diameter, internal diameter, length and thread dimensions.
5.5.3 Traceability
The traceability of coupler manufacture shall comply with the following requirements: a) Coupler shall have imprinted mark on its external surface in accordance with the stipulations in 8.1;
b) The batch No. of couplers shall be consistent with records, such as: raw material inspection report, delivery or outbound voucher, product inspection record, product certificate and product quality certificate, etc.;
c) The storage of relevant records of coupler batch No. shall not be less than 3 years.
5.6 Anti-rust
Before exiting factory, couplers shall have anti-rust measures.
6 Test Methods
6.1 Raw Materials
6.1.1 Sampling
The inspection of the mechanical properties of raw materials of coupler shall comply with the following requirements:
a) Sampling shall be conducted on materials which have passed the inspection of shapes.
b) In the inspection of the mechanical properties of raw materials of coupler, raw materials of the same designation, the same specification and the same
furnace (batch) No. shall be considered as one batch for acceptance
inspection. From each batch, at least 2 samples shall be taken, and each sample shall be taken from different roots of raw materials. When the
mechanical properties of each sample comply with the requirements in 5.1.1 and 5.1.2, then, this batch of materials shall be determined as qualified; if the mechanical properties of one and more than one samples fail to comply with the requirements, then, this batch of materials shall be determined as
disqualified.
c) In the hardness test of the raw materials of coupler for squeezing, raw materials of the same designation, the same specification and the same
furnace (batch) No. shall be considered as one batch for acceptance
inspection. In accordance with 10% count of materials, conduct spot check from each batch; take 1 sample from each count. Inspect 3 points on each sample. When the tested average hardness value of each sample satisfies the hardness requirements in product design and the stipulations in Table 2, then, this batch of materials shall be determined as qualified in hardness; if the average hardness of one and more than one samples fails to comply with the requirements, then, this batch of materials shall be determined as
disqualified in hardness.
7.2 Coupler
7.2.1 Classification
There are two types of coupler inspection: exit-factory inspection and type inspection. 7.2.2 Exit-factory inspection
The exit-factory inspection of coupler shall comply with the following requirements: a) Inspection items: exit-factory inspection items of coupler shall include two types: the inspection of shapes, marks and dimensions; the inspection of tensile strength.
1) Inspection items of shapes, marks and dimensions shall comply with the stipulations in Table 8.
inspection of shapes, marks and dimensions in 1) of b) may be reduced from 10% to 5%.
7.2.3 Type inspection
The type inspection of coupler shall comply with the following requirements: a) Under the following circumstances, type inspection of coupler shall be conducted:
1) When type approval of coupler products is required.
2) When there are changes in the materials, processes and specifications of coupler.
3) When type inspection report was issued over 4 years ago.
b) Inspection items include:
1) Marks, shapes and dimensions of coupler.
2) Tension of steel rebar test pieces.
3) Unidirectional tension of test piece of splice.
4) Repeated tension and compression of test piece of splice through high stress.
5) Repeated tension and compression of test piece of splice through large deformation.
c) Steel rebars used for type inspection shall comply with the stipulations of relevant standards on steel rebar.
d) Inspection rules include:
1) In terms of each type, grade, specification, material and process of rebar mechanical splice, standard splice shall be selected for type inspection; the number of test pieces of splice shall not be less than 9. Among them, the number of unidirectional tension test pieces shall not be less than 3; the number of repeated tension and compression test pieces through
high stress shall not be less than 3; the number of repeated tension and compression test pieces through large deformation shall not be less than 3. Meanwhile, take another 3 rebar test pieces to conduct the tensile
strength test. All the test pieces should be taken from the same steel rebar. 2) Test pieces of threaded splice used for type inspection shall be delivered to the inspection organization in bulk items. The type inspection
value of 3 test pieces shall comply with the stipulations in Table 7.
f) Type inspection shall be conducted by an inspection institution approved by national or provincial competent department. In accordance with the format in Appendix C, an inspection report and evaluation conclusion shall be issued. 8 Marking, Packaging, Transportation and Storage
8.1 Marking
8.1.1 Composition
On the surface of coupler, distinct and durable marking shall be imprinted. The marking shall include marks, code of manufacturer and manufacture batch No. that allows traceability to the performance of raw materials that comply with the stipulations in 4.3. The code of manufacturer may be characters or patterns. Manufacture batch No. may be figures, or a combination of figures and symbols.
8.1.2 Arrangement
Marking on the surface of coupler may be arranged in a single row or in two rows. When it is arranged in two rows, name code, character code and main parameter code shall be arranged in one row.
8.1.3 Examples of marking
Example 1:
Parallel threaded coupler for splicing rebars with rib stripped before rolling of threads, with left and right hand thread, used for the splicing with HRB500 steel rebar coupler with the diameter of 25 mm, code of manufacturer: ????????????, manufacture batch No.: 11211, shall be expressed in: BZ 5 25 ???????????? 11211.
Example 2:
Taper threaded, standard type, used for the splicing with HRB400 steel rebar coupler with the diameter of 14 mm, code of manufacturer: ????????????, manufacture batch No.: 11211, shall be expressed in: ZB 4 25 ???????????? 11211.
Example 3:
Parallel threaded coupler for splicing rebars with threads roll on to rebar end, with different inner diameter, used for the splicing with HRB400 steel rebar coupler with the diameter of 20 mm / 25 mm, code of manufacturer: ????????????, manufacture batch No.: 11211, shall be expressed in: GY 4 22/25 ???????????? 11211.
8.2 Packaging
8.2.1 Packaging materials and surface marks
Couplers exiting factory shall adopt cardboard boxes, woven bags or other reliable bags. On the surface of the packaging materials, indicate the name of product, type of coupler, quantity, applicable rebar specifications, date of manufacture, manufacture batch No., and name, address and contact information of manufacturer, etc. 8.2.2 Requirements
The packaging of coupler shall comply with the stipulations in GB/T 9174. 8.2.3 Product certificate and quality certificate
When couplers exit factory, a product certificate shall be attached inside the packaging. Meanwhile, a product quality certificate shall be submitted to the users. a) Product certificate shall include the following content:
-- Name of manufacturer;
-- Name and type of product;
-- Applicable steel rebar designations, splice performance grades;
-- Manufacture batch No., date of manufacture;
-- Signature of quality inspector.
b) Product quality certificate shall include the following content:
-- Type;
-- Type and specification;
-- Applicable rebar strength grades;
-- Manufacture batch No.;
-- Implemented standard;
-- Dimensional inspection items and parameters, inspection conclusion;
-- Quality inspection seal;
-- Name, address and contact information of manufacturer.
Please refer to Appendix D and Appendix E for the formats of product certificate and product quality certificate.
8.3 Transportation and Storage

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