This code is applicable to the connection of grade II and III steel bars with a steel bar diameter of 16-40mm in the concrete structure of industrial and civil buildings. JGJ 109-1996 Technical Code for Taper Threaded Joints of Steel Bars JGJ109-1996 Standard download decompression password: www.bzxz.net

Engineering Construction Standards Full-text Information System
Industry Standards of the People's Republic of China
Technical Specification for Taper
Threaded Splicing of Rebars
109-96
1997BeijingbzxZ.net
Engineering Construction Standards Full-text Information System
.Engineering Construction Standards Full-text Information System
Industry Standards of the People's Republic of China
Technical Specification for Taper
Threaded Splicing of Rebars Rebars
JGJ109—96
Editing unit: Beijing Institute of Architectural EngineeringApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: April 1, 1997
1997 Beijing
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Engineering Construction Standard Full-text Information System
Notice on the Release of the Industry Standard "Technical Specification for Cone Threaded Joints of Rebars"
Construction Standard [1996] No. 615
According to the requirements of the Ministry of Construction's Construction Standard [1993] No. 699, the "Technical Specification for Cone Threaded Joints of Rebars" edited by Beijing Institute of Architectural Engineering has been reviewed and approved as an industry standard, numbered IGJ109-96, and will be implemented from April 1, 1997. This standard is interpreted by Beijing Institute of Architectural Engineering, the technical management unit of construction engineering standards of the Ministry of Construction, and published by the Standard and Norms Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
December 2, 1996
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Engineering Construction Standards Full Text Information System
Joint performance level
Joint application
Construction regulations
Construction preparation
Rebar taper thread processing
Rebar connection
Joint type inspection
Joint construction site inspection and acceptance
Appendix A
Appendix B
Appendix C
Processing quality inspection method
Belt joint connection method
Construction record
Tensile test of steel bar taper thread joints·
C.0.2 Inspection of steel bar taper thread processing
Quality inspection of steel bar taper thread joints
Appendix
Terms used in this code
Additional instructions
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1.0.1 In order to use steel bar taper thread joints (referred to as joints) in concrete structures to achieve economic rationality and ensure quality, this code is formulated. 1.0.2 This code is applicable to the connection of Grade I and III steel bars with a steel bar diameter of 16 to 40 mm in concrete structures of industrial and civil buildings. 1.0.3 The steel bars connected by the steel tapered thread joint shall comply with the requirements of the current national standards "Hot-rolled ribbed steel bars for reinforced concrete" GB1499 and "Residual heat treated steel bars for reinforced concrete" GB13014. When implementing this code, it shall also comply with the relevant provisions of the current national standards.
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2 Terms
2.0.1 Steel tapered thread joint (Taperthreadedsplicesofrebar): The connecting end of the steel screen is processed into a tapered thread (referred to as a thread head), and two steel bars with thread heads are connected into an integrated steel bar joint according to the specified torque value through a tapered thread connection sleeve. 2.o.2 Torque wrench (Forquewrench): A torque wrench for connecting and checking the tightness of steel bar joints. 2.0.3 Complete thread (Onecompletescrewthread): A standard tooth shape with one continuous circle.
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Engineering Construction Standard Full Text Information System
3 Joint Performance Grade
3.0.1 The material of the tapered thread connection sleeve should be No. 45 high-quality carbon structural steel or other steel materials that have been tested and confirmed to meet the requirements. The tensile bearing capacity of the tapered thread connection sleeve should not be less than 1.10 times the standard value of the tensile bearing capacity of the connected steel bar. 3.0.2 The joints should be divided into two performance grades, A and B, based on the differences in static unidirectional tensile properties and repeated tension and compression properties under high stress and large deformation conditions. 3.0.3 The performance of grade A and B joints shall comply with the provisions of Table 3.0.5 of the current industry standard "General Technical Code for Mechanical Connection of Steel Bars" JGJ107. 3.0.4 For structures that directly bear dynamic loads, their joints shall meet the fatigue resistance requirements of the design. When there are no special requirements, their fatigue performance shall comply with the provisions of Article 3.0.6 of the current industry standard "General Technical Code for Mechanical Connection of Steel Bars" JGJ107. Engineering Construction Standard Full Text Information System
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4 Joint Application
4.0.1 The selection of performance grade of steel bar taper thread joints shall comply with the following provisions: 4.01.1 In the concrete structure, the parts that require full use of steel bar strength or have high joint ductility requirements shall adopt Class A joints.
4.0.1.2 In the concrete structure, the parts where the steel bar is subjected to less force and the joint ductility requirements are not high can adopt Class B joints.
4.0.2 The joint positions of the same cross-section stress-bearing steel bars in the same component shall be staggered. In the section from the center of any joint to the length of 35 times the diameter of the steel bar, the percentage of the cross-sectional area of ​​the stress-bearing steel bars with joints to the total cross-sectional area of ​​the stress-bearing steel bars shall comply with the following provisions:
4.0.21 The percentage of stress-bearing steel bar joints in the tension zone should not exceed 50%. 4.0.22 In the parts where the steel bar is subjected to less force in the tension zone, the percentage of Class A joints is not limited.
A joint shall avoid the reinforcement of the frame end and column end with seismic fortification requirements 4.0.2.3
densified area; when it is impossible to avoid, the joint shall be A-class joint, and the joint percentage shall not exceed 50%.
4.0.2.4 In the compression zone and the part with less stress on the steel bars in the prefabricated components, the percentage of A-class and B-class joints may not be restricted.
The distance between the end of the joint and the bending point of the steel bar shall not be less than 10 times the diameter of the steel bar. When connecting steel bars of different diameters, the diameter specification of the steel bars connected at one time shall not exceed two 4.0.5 The concrete protective layer thickness of the steel bar connection sleeve should meet the requirements of the minimum thickness of the concrete protective layer of the stress-bearing steel bars in the current national standard "Concrete Structure Design Code", and shall not be less than 15mm. The horizontal clearance between the connection sleeves should not be less than 25mm. Engineering Construction Standard Full Text Information System
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5 Construction Regulations
5.1 Construction Preparation
All operators, technical management and quality management personnel involved in joint construction shall participate in technical regulations training; operators shall be certified after passing the assessment. 5.1.2 The steel bars shall be straightened before cutting. The cut end face shall be perpendicular to the axis of the steel bar and shall not be horseshoe-shaped or deflected. Gas cutting shall not be used for cutting. 5.1.3 The tapered thread connection sleeve shall be provided with a product certificate; the tapered holes at both ends shall have sealing covers; and the sleeve surface shall have specification markings. When entering the site, the construction unit shall conduct a re-inspection. 5.2 The taper, tooth shape, pitch, etc. of the steel bar taper thread head processed by the king
must be consistent with the taper, tooth shape, and pitch of the connection sleeve, and shall be qualified after the matching gauge inspection. 5.2.2 When adding steel bar taper thread, water-soluble cutting lubricant should be used. When the temperature is below 0℃, 15% to 20% sodium nitrite should be added. Engine oil shall not be used as lubricant or threading shall not be done without lubricant.
5.2.3 Operators shall check the appearance quality of steel bar thread heads one by one according to the requirements of Appendix A.
For steel bar thread heads that have passed self-inspection, 10% of each specification processing batch shall be randomly inspected according to the requirements of Appendix A, and no less than 10 pieces shall be inspected, and the steel bar taper thread processing inspection record shall be filled in according to Appendix C Table C.0.2. If one thread head fails to pass the inspection, the entire processing batch shall be inspected, and the unqualified thread head shall be reprocessed and re-inspected before use. 5.2.5 Thread heads that have passed the inspection shall be protected. The thread head at one end of the steel bar shall be protected with a protective cap, and the other end can be tightened with the connecting sleeve according to the torque value specified in Table 5.3.5, and the threads shall be neatly stacked according to the specifications for use.
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5.3 Steel Bar Connection
5.3.1 When connecting steel bars, the specifications of the steel bars and the connecting sleeves should be consistent, and ensure that the threads of the steel bars and the connecting sleeves are clean and intact. 5.3.2 When using embedded joints, the position, specifications and quantity of the connecting sleeves should meet the design requirements. The steel bars with connecting sleeves should be firmly fixed, and the exposed ends of the connecting sleeves should have sealing covers. 5.3.3 The joints must be tightened with a torque wrench
5.3.4 The accuracy of the torque wrench is ±5%, and it is required to be calibrated with a torque meter every six months. 5.$.5 When connecting steel bars, the steel bars should be screwed into the connecting sleeves along the axis, and then tightened with a torque wrench. The tightening value of the joint should meet the torque value specified in Table 5.3.5 and must not be over-tightened. The tightened joints should be marked.
Joint tightening torque value
Rebar diameter (mm)
Tightening force short (Nm)
Torque wrenches used for quality inspection and construction installation should be used separately and must not be mixed. Engineering Construction Standard Full Text Information System
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6 Joint type inspection
6.0.1 The type inspection of steel bar tapered thread joints shall comply with the spare items in Chapter 5 of the current industry standard "General Technical Code for Mechanical Connection of Steel Bars" IGI107. Engineering Construction Standard Full Text Information System
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7 Joint construction site inspection and acceptance
7.0.1 When using steel bar tapered thread joints in the project, the technology provider shall provide a valid type inspection report
7.0.2 When connecting steel bars, the factory certificate of the connecting sleeve and the steel bar tapered thread processing inspection record shall be checked.
7.0.3Before the start of the steel bar connection project and during the construction process, each batch of incoming steel bars and joints shall be subject to process inspection:
1.Tensile strength test of each specification of steel bar parent material; 2.The number of test pieces of each specification of steel bar joints shall not be less than three; 3.The joint test pieces shall meet the strength requirements of the corresponding grade in Table 3.0.5 of the current industry standard "General Technical Regulations for Mechanical Connection of Steel Bars" JG107. When calculating the actual tensile strength of the steel bar, the actual cross-sectional area of ​​the steel bar shall be used for calculation. 7.0.4
Randomly select 10% of the number of joints of the same specification for appearance inspection. The specifications of the steel bar and the connection sleeve shall be consistent, and the joint threads shall not be completely exposed. 7.0.5Use the torque wrench for quality inspection to spot check the connection quality of the joints according to the joint tightening value specified in Table 5.3.5. Number of random inspections: 15% of the number of joints for beam and column components, and the number of joints for each component shall not be less than one joint. For foundation, wall and slab components, according to their respective number of joints, every 100 joints shall be considered as an acceptance batch, and those less than 100 shall also be considered as an acceptance batch. Three joints shall be randomly inspected in each batch. All the joints sampled shall be qualified. If one joint is unqualified, the joints in the acceptance batch shall be checked one by one, and the unqualified joints found shall be reinforced, and the joint quality inspection record shall be filled in according to Appendix C Table C.0.3. 7.0.6 The on-site inspection of joints shall be carried out in acceptance batches. The same grade and specification joints of the same batch of materials under the same construction conditions shall be inspected and accepted in an acceptance batch of 500, and those less than 500 shall also be considered as an acceptance batch. 7. β.7 For each acceptance batch of joints, 3 specimens shall be randomly intercepted from the engineering structure for unidirectional tensile test, and the joint performance level shall be inspected and evaluated according to the design requirements, and the engineering construction standard full text information system
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