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JGJ107-2016: Technical specification for mechanical splicing of steel reinforcing bars Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid JGJ107: Historical versions
Similar standardsJGJ 107-2016: Technical specification for mechanical splicing of steel reinforcing bars---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JGJ107-2016INDUSTRY 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 INDUSTRY STANDARD OF THE PEOPLE��S REPUBLIC OF CHINA Technical specification for mechanical splicing of steel reinforcing bars Approved by. Ministry of Housing and Urban-Rural Development of PRC Date of implementation. August 1, 2016 2016 Beijing Announcement of Ministry of Housing and Urban- Rural Development of PRC No.1049 Table of ContentsForeword... 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 bars1 General provisions1.0.1 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 symbols2.1 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. 2.2 Symbols Asgt - Total elongation of splice sample under maximum force; d - Nominal diameter of the steel reinforcing bar; fyk - Standard value of the yield strength of the steel reinforcing bar; fstk - Standard value of ultimate tensile strength of steel reinforcing bars; - The measured ultimate tensile strength of the splice sample; P - The pitch of thread; u0 - Residual deformation of the splice sample within the specified gauge after loading it to 0.6fyk and then unloading it;3 Performance requirements of splices3.0.1 The splice design shall meet the requirements of strength and deformation performance. 3.0.2 The sleeve for connection of steel reinforcing bar shall comply with the relevant specifications of the current industry standard ��Couplers for rebar mechanical splicing�� JG/T 163; when the sleeve��s raw material is a No.45 cold- drawn or cold-rolling precision seamless steel tube, the steel tube shall be annealed and meet the requirements of the requirements current industry standard ��Couplers for rebar mechanical splicing�� JG/T 163 for the strength limit and elongation at break of steel tubes. The raw material of the stainless steel rebar sleeve should use the bar or seamless steel tube of the same materials as the base material of steel reinforcing bar; its appearance and mechanical properties shall comply with the provisions of the current national standard ��Stainless steel bars�� GB/T 1220, ��Seamless stainless steel tubes for structure�� GB/T 14975. 3.0.3 Splice performance shall include unidirectional tensile, high-stress repeated tension-compression, large-deformation repeated tension- compression, fatigue performance. It shall, based on the performance grade and application of the splice, choose the corresponding inspection items. 3.0.4 Splices shall be divided into three grades. I, II, III, based on ultimate tensile strength, residual deformation, total elongation at maximum force, repeated tension-compression under high-stress and large-deformation conditions. The performances shall comply with the provisions of clauses 3.0.5 ~ 3.0.7 of this specification, respectively.4 Splice applications4.0.1 The selection of splice grades shall meet the following requirements. 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. 4.0.4 For structures that are directly subjected to repeated loads, the splices shall be selected from certified products that contain type testing reports for fatigue performance.5 Initial type testing of splices5.0.1 Type testing shall be performed in the following cases. 5.0.2 Splice��s type testing samples shall meet the following requirements. 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. 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.6 Machining and installing of splices on site6.1 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. 6.2 Machining of splices on site 6.2.1 The processing of straight threaded rebar threaded sector shall meet the following requirements. 6.2.2 The processing of the conical threaded rebar threaded sector shall meet the following requirements. 6.3 Installing of splices on site7 Inspecting and accepting of splices on site7.0.1 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. 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. 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. 7.0.5 On-site spot check items for splices shall include ultimate tensile strength test, processing and installation quality inspection. The spot check shall be carried out in acceptance batches. 7.0.6 The splice��s installation inspection shall meet the following requirements. 7.0.5 of this specification. When the number of unacceptable tightening torque values exceeds 5% of the number of verified splices, it shall tighten all splices again, until all splices are qualified. 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. 7.0.8 For closed ring rebar splices, rebar cage splices, buried sleeve splices for underground diaphragm walls, stainless steel rebar splices, rebar splices between prefabricated structural members, the splices with fatigue performance requirements, it may perform witnessed sampling. From the processed and qualified finished products of rebar threaded sectors, randomly cut rebar samples; 7.0.9 For the on-site inspection of the same splice type, same model, same grade, same specification, if the one-time qualification rate of the tensile strength tests of the samples from 10 consecutive acceptance batches is 100%, the number of splices in the acceptance batch can be expanded to 1000. 7.0.10 For validly certified splice products, the number of acceptance batches can be expanded to 1000; if the one-time qualification rate of the ultimate tensile strength tests of the samples from 10 consecutive acceptance batches is 100%, the number of splices in the acceptance batch can be expanded to 1500.When the evaluation results of the ultimate tensile strength of the sample in the expanded acceptance batches appear unqualified items, the number of subsequent acceptance batches shall be restored to 500, meanwhile the number of acceptance batches shall not be expanded again. 7.0.11 For the project wherein the design requires site inspection for the fatigue performance requirements, it may, based on the stress amplitude and maximum stress of the steel reinforcing bar as provided by design, or otherwise according to the similar group of stress in Table 5.0.5 of this specification, carry out the verification test of the fatigue performance; meanwhile it shall select the steel reinforcing bars of large, medium, small diameters from the project to respectively assemble 3 splice samples for the fatigue test. 7.0.12 After cutting the sample at site, the steel reinforcing bar at the original splice position may use the steel reinforcing bar of the same specification for binding overlap splicing, welding, mechanical splicing method, etc., for connection. 7.0.13 For acceptance batch of unqualified splices for random inspection, the relevant parties of the project shall study and propose a treatment plan. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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