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JGJ 107-2016
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P JGJ 107-2016
Registration No. J 986-2016
Technical specification for mechanical splicing of
steel reinforcing bars
ISSUED ON: FEBRUARY 22, 2016
IMPLEMENTED ON: AUGUST 01, 2016
Issued by: Ministry of Housing and Urban-Rural Development of PRC
Table of Contents
Foreword ... 4 
1 General provisions ... 8 
2 Terms and symbols ... 9 
2.1 Terms ... 9 
2.2 Symbols ... 10 
3 Performance requirements of splices ... 11 
4 Splice applications ... 13 
5 Initial type testing of splices ... 15 
6 Machining and installing of splices on site ... 17 
6.1 General requirements ... 17 
6.2 Machining of splices on site ... 17 
6.3 Installing of splices on site ... 18 
7 Inspecting and accepting of splices on site ... 20 
Appendix A -- Test methods for splice samples ... 24 
Appendix B -- Test report of initial type testing of splices ... 30 
Explanation of wording in this specification ... 36 
List of quoted standards ... 37 
Descriptions of provisions ... 38 
Technical specification for mechanical splicing of
steel reinforcing bars
1 General provisions
1.0.1 In order to standardize the application of rebar mechanical connection in
reinforced concrete structural engineering, so as to be safe, applicable,
advanced in technology, economical and reasonable, to ensure quality, this
specification was formulated.
1.0.2 This specification is applicable to the design, construction and acceptance
of rebar mechanical connection in reinforced concrete structures of construction
projects.
1.0.3 The steel reinforcing bars used for mechanical connection shall comply
with the current national standards “Steel for the reinforcement of concrete -
Part 2: Hot rolled ribbed bars” GB 1499.2, “Quenching and self-tempering
ribbed bars for the reinforcement of concrete” GB 13014, “Stainless steel bars
for the reinforcement of concrete” YB/T 4362, “Steel for the reinforcement of
concrete - Part 1: Hot rolled plain bars” GB 1499.1.
1.0.4 In addition to this specification, the rebar mechanical connection shall also
comply with the relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Rebar mechanical splicing
A connection method for transmitting a force in one reinforcing bar to another
reinforcing bar through mechanical occlusion of a reinforcing bar with a
connecting member or other intervening material or pressure bearing effect on
a reinforcing bar’s end face.
2.1.2 Splice
In a complete set of devices of rebar mechanical connection, a shorted name
of rebar mechanical connections.
2.1.3 Connectors of mechanical splicing
It connects the various components for reinforcing steel bar, including sleeves
and other components.
2.1.4 Coupler or sleeve
A steel sleeve used to transmit the axial tensile or compressive force of a
reinforcing steel bar.
2.1.5 Rebar threaded sector
A threaded section at the end of a reinforcing steel bar in a splice.
2.1.6 Length of mechanical splice
The length of the splice’s connector plus the length of the segment of the
variable cross-section of the reinforcing steel bar at both ends of the connector
of mechanical splicing. The exposed threaded head and upset transition
segment of the threaded sector belong to variable cross-sectional segments.
2.1.7 Tensile strength of splice
The maximum tensile stress value of the splice sample during the tensile test.
2.1.8 Residual deformation of splice
After the splice sample is loaded and unloaded according to the specified
loading system, the deformation measured within the specified gauge distance.
2.1.9 Total elongation of splice sample at maximum tensile force
4 Splice applications
4.0.1 The selection of splice grades shall meet the following requirements:
1 In the concrete structure, where the strength of the steel reinforcing bar is
required to be fully exerted or where high ductility is required, it shall select
the grade II or grade I splices; when the area percentage of the steel splices
in the same splicing segment is 100%, it shall select grade I splice.
2 In the location of the concrete structure where the steel reinforcing bar has
high stress but has low requirements for the ductility, it may select the grade
III splices.
4.0.2 The thickness of the concrete protective layer of the connector of
mechanical splicing should comply with the provisions of the current national
standard “Code for design of concrete structures” GB 50010, meanwhile it shall
not be less than 0.75 times the minimum protective layer thickness of steel
reinforcing bars and 15 mm, whichever is larger. If necessary, it may take anti-
rust measures for the connector of mechanical splicing.
4.0.3 The splices of longitudinally stressed steel reinforcing bars in structural
members should be staggered from each other. The length of the connecting
segment of the rebar mechanical splicing shall be calculated as 35d. When the
steel reinforcing bars with different diameters are connected, it should be
calculated based on the steel reinforcing bar of smaller diameter. The area
percentages of the rebar mechanical splicing located in the same connection
segment shall meet the following requirements:
1 The splice should be set at the place where the stress of the structural
member's tensile steel reinforcing bar is relatively small. When the splice is
set at the high stress part, the percentage of the splice area of the grade III
splice in the same connection segment shall not be greater than 25%; the
area percentage of the grade II splices shall be not more than 50%. Except
for the conditions as listed in item 2 and item 4 in this clause, the splice area
percentage of the grade I splices may be not limited otherwise.
2 Splices should avoid the beam-end and column-end stirrup-densified areas
of the frame which has seismic fortification requirements; when it cannot be
avoided, it shall use the grade II splices and grade I splices. Meanwhile the
splice area percentage shall be not greater than 50%.
3 The percentage of splice area can be unrestricted for areas with small tensile
stress of tensioned steel reinforcing bars or longitudinally compressed steel
reinforcing bars.
4 For structural members that are directly subjected to repeated loads, the
5 Initial type testing of splices
5.0.1 Type testing shall be performed in the following cases:
1 When determining the splice’s performance grade;
2 When the sleeve’s material, specifications and splice processing technology
are changed;
3 When the type testing report is over 4 years.
5.0.2 Splice’s type testing samples shall meet the following requirements:
1 For each type, grade, specification, material, and process of rebar mechanical
splicing, the number of samples for type testing shall not be less than 12; of
which, the number of samples for tensile strength test of the base metal shall
be not less than 3; the number of samples for unidirectional tensile test shall
be not less than 3; the number of samples for high-stress repeated tension-
compression shall be not less than 3; the number of samples for large-
deformation repeated tension-compression shall be not less than 3;
2 The steel reinforcing bars of all samples shall be cut from the same steel
reinforcing bar;
3 The splice sample shall be installed in accordance with the requirements of
clause 6.3 of this specification;
4 The samples for type testing shall not use the pre-drawn samples.
5.0.3 The type testing of the splices shall be carried out in accordance with the
provisions of Appendix A of this specification. When the test results meet the
following requirements, they shall be assessed as qualified:
1 Strength testing: The actual measured value of the strength of each splice
sample shall meet the strength requirements of the corresponding splice
grade in Table 3.0.5 of this specification;
2 Deformation testing: The average value of the measured values of the total
deformation of the three samples under the residual deformation and the
maximum force shall meet the requirements of Table 3.0.7 of this
specification.
5.0.4 Type testing shall record the parameters of the connectors of mechanical
splicing and splices in detail. It should issue a testing report and assessment
conclusion according to the format of Appendix B of this specification.
5.0.5 When the splice is used for components that are directly subjected to
6 Machining and installing of splices on site
6.1 General requirements
6.1.1 On-site processing of rebar threaded sector and installation of splices
shall be performed according to the processing and installation technical
requirements of the providers for splice technology. The operators shall go to
work after passing the professional training. The staff shall be stable.
6.1.2 Processing of rebar threaded sector and installation of splices shall be
carried out only after passing the technical testing.
6.2 Machining of splices on site
6.2.1 The processing of straight threaded rebar threaded sector shall meet the
following requirements:
1 The end of the steel reinforcing bar shall be leveled by a band saw, grinding
wheel saw or a special steel reinforcing bar cutting machine with a circular
blade;
2 The upsetting head shall not have a transverse crack perpendicular to the
axis of the steel reinforcing bar;
3 The length of the rebar threaded sector shall meet the product design
requirements; the limit deviation shall be 0 ~ 2.0p;
4 The rebar threaded sector should meet the grade 6f accuracy requirements.
It shall use a special straight thread gauge for inspection. The go-gauge shall
be able to screw in smoothly and reach the required screw-in length. The
screw-in of no-go-gauge must not exceed 3p. The number of self-tests for
each specification shall not be less than 10%; the inspection pass rate shall
not be less than 95%.
6.2.2 The processing of the conical threaded rebar threaded sector shall meet
the following requirements:
1 There must be no local bending at the end of the steel reinforcing bar that
affects thread processing;
2 The length of the rebar threaded sector shall meet the product design
requirements; the rebar threaded sectors after tightening must not contact
each other; the limit deviation of the processing length of the threaded sector
shall be -0.5p ~ -1.5p;
7 Inspecting and accepting of splices on site
7.0.1 When splices are used in engineering, the relevant technical data of
splices submitted by the splice technology provider shall be reviewed and
accepted, which shall include the following:
1 The valid type testing report of splices used in the project;
2 Relevant technical documents for product design of splices, processing and
installation of splices;
3 Certificate of qualification of splice products and quality certificate of raw
materials for connectors of mechanical splicing.
7.0.2 The splice process testing shall be carried out for the steel reinforcing
bars of different production plants. When the steel reinforcing bar plant or splice
technology provider is replaced during construction, it shall make additional
process testing, which shall meet the following requirements:
1 All types and models of splices shall be subject to process testing, which
includes unidirectional tensile ultimate tensile strength and residual
deformation;
2 There shall be not less than 3 samples of each type of steel splices;
3 After measuring the residual deformation of the splice sample, the ultimate
tensile strength test can be continued; meanwhile it should carry out the test
according to the unidirectional tensile loading system in Table A.1.3 of this
specification;
4 The ultimate tensile strength of each sample and the average value of the
residual deformation of the 3 splice samples shall meet the requirements of
Table 3.0.5 and Table 3.0.7 of this specification;
5 When the process testing fails, it shall adjust the process parameters. After
passing the test, it can use the finally determined process parameters the
splices can be processed in batches according to the final confirmed process
parameters.
7.0.3 The rebar threaded sector’s processing shall be subject to self-inspection
in accordance with the requirements of clause 6.2 of this specification. When
the supervision or quality inspection department disagrees with the processing
quality of rebar threaded sector on-site, it may randomly take 3 splice samples
for the testing of the ultimate tensile strength and unidirectional tensile residual
deformation. If the ultimate tensile strength of one sample or the average value
of the residual deformation values of three samples is unsatisfactory, it shall
2 For the sleeve extruded splices, it shall take 10% splices according to the
acceptance batch. The diameter of the indentation or the length of the sleeve
after extrusion shall meet the requirements of item 3 of clause 6.3.3 of this
specification; the depth of the steel reinforcing bar inserted into the sleeve
shall meet the product design requirements. When the number of unqualified
inspections exceeds 10%, it may take 3 samples from the unqualified splices
in appearance inspection in this batch to carry out the ultimate tensile
strength test; it is evaluated in accordance with clause 7.0.7 of this
specification.
7.0.7 For each acceptance batch of splices, it shall randomly cut 3 splice
samples from the engineering structure for ultimate tensile strength test. It is
evaluated according to the splice grade required by the design. When the
ultimate tensile strength of the three splice samples meets the strength
requirements of the corresponding grades in Table 3.0.5 of this specification,
the acceptance batch shall be evaluated as qualified. When the ultimate tensile
strength of only 1 sample does not meet the requirements, it shall take another
6 samples for re-inspection. In the re-inspection, if the ultimate tensile strength
of one...