This specification is applicable to the radial extrusion connection of grade II and III ribbed steel bars with a diameter of 16-40mm for concrete structures of industrial and civil buildings. JGJ 108-1996 Technical Specification for Sleeve Extrusion Connection of Ribbed Steel Bars JGJ108-1996 Standard download decompression password: www.bzxz.net

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Industry Standard of the People's Republic of China
Sleeve Extrusion of Ribbed Steel Bars
Technical Specification for Connection
Specification for Pressed Sleeve Splicing of Ribbed Steel Bars
JGJ108—96
1997Beijing
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Industry Standard of the People's Republic of China
Sleeve Extrusion of Ribbed Steel Bars
Technical Specification for Connection
Specification for Pressed Sleeve Splicing of Ribbed Steel BarsJGJ108—96
Editor: China Academy of Building ResearchApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: April 1, 1997
1997Beijing
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Notice on the release of the industry standard "Technical Specifications for Sleeve Extrusion Connection of Ribbed Steel Bars"
Jianbiao [1996] No. 615
According to the requirements of the Ministry of Construction (89) Jianbiao No. 8 document, the "Technical Specifications for Sleeve Extrusion Connection of Ribbed Steel Bars" compiled by the China Academy of Building Research has been reviewed and approved as an industry standard, numbered JGJ108—96, and will be implemented from April 1, 1997. This standard is managed and interpreted by the China Academy of Building Research, the unified unit of the Ministry of Construction's construction engineering standards and technology, and published by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
December 2, 1996
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Performance Grades and Applications of Extrusion Joints
Construction of Extrusion Joints
4.1 Extrusion Equipment
4.2 Construction Operation
4.3 Safety Measures
5 Type Inspection of Extrusion Joints
Construction Site Inspection of Extrusion Joints Appendix A Uniaxial tensile test at construction site. Appendix B
Record of visual inspection of extruded joints at construction site Explanation of terms used in this code
Appendix C
Additional instructions
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1 General
This code is formulated to achieve advanced technology, safety and applicability, economic rationality and quality assurance when using ribbed steel sleeve extrusion joints (hereinafter referred to as extrusion joints) in concrete structures.
2 This code is applicable to radial extrusion connections of I and III grade ribbed steel bars with a diameter of 16 to 40 mm in concrete structures of industrial and civil buildings. 1.0.2
1.0.3 The steel bars used for extrusion connections 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. This code should be used in conjunction with the current industry standard "General Technical Code for Mechanical Connection of Steel Bars" JGJ107-96. And it should comply with the relevant provisions of the current national standards. Engineering Construction Standards Full Text Information System
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2 Performance Level and Application of Extrusion Joints
2.0.1 Extrusion joints should be divided into two performance levels, A and B, according to the static unidirectional tensile performance and the repeated tension and compression performance under high stress and large deformation conditions: 2.0.2 The performance of Class A and Class B extrusion joints shall comply with the provisions of Table 3.0.5 in the current industry standard "Technical Code for Mechanical Connection of Steel Bars - General Provisions" JGJ107. 2.0.3 The scope of application of Class A and Class B extrusion joints shall comply with the provisions of Article 4.0.1 in the current industry standard "General Technical Code for Mechanical Connection of Steel Bars" JGJ107. 2.0.4 The thickness of the concrete protective layer of the extrusion joint should meet the requirements of the minimum thickness of the protective layer of the stressed steel bars in the current national standard "Concrete Structure Design Code", and shall not be less than 15mm. The lateral clearance between the connecting sleeves should not be less than 25mm. 2.0.5 The extrusion joints set in the same structural member should be staggered. In the section from the center of any joint to a length of 35 times the diameter of the steel bar, the percentage of the cross-sectional area of ​​the stressed steel bars with joints to the total cross-sectional area of ​​the stressed steel bars should comply with the provisions of Sections 4.0.3.1 and 4.0.3.4 of the current industry standard "General Technical Code for Mechanical Connection of Steel Bars" JGJ107.
2.0.6 Ribbed steel bars of different diameters can be connected by extrusion joints. When the outer diameter and wall thickness of the two ends of the sleeve are the same, the diameter difference of the connected steel bars should not be greater than 5mm. 2.0.7 For structures directly subjected to dynamic loads, their joints should meet the fatigue resistance requirements of the design.
When there is no special requirement, its 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. 2.0.8 When the temperature of the extruded joint in the concrete structure is lower than -20℃, special tests should be carried out.
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3.0.1 The sleeve material used for the extruded joint of grade I and III ribbed steel bars should be steel suitable for rolling processing, and its actual measured mechanical properties should meet the requirements of Table 3.0.1. Mechanical properties of sleeve materials
Yield strength (N/mm2)
Tensile strength (N/mm2）
Elongation 86(%)
Hardness (HRB)
or (HB）
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225~350
375~500
102~133
When designing the connecting sleeve, the bearing capacity of the sleeve should meet The following requirements: fslykA≥1.10fAs
fsAa≥1.10fuAs
wherein fswk is the standard value of sleeve yield strength; fsk is the standard value of sleeve tensile strength;
fzhang is the standard value of steel bar yield strength;
fu is the standard value of steel bar tensile strength;
Asl is the cross-sectional area of ​​sleeve;
A is the cross-sectional area of ​​steel bar.
3.0.3 The dimensional deviation of sleeve should meet the requirements of Table 3.0.3. Engineering Construction Standard Full Text Information System
(3.0.2-1)
(3.0.2-2)
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Permissible deviation of sleeve size (mm)
Sleeve outer diameter D
Permissible deviation of outer diameter
Permissible deviation of wall thickness (t)
Permissible deviation of length
4 Sleeves should have factory certificates. Sleeves should be neatly stacked according to different specifications during transportation and storage, and must not be stacked in the open air to prevent rust and contamination. Engineering Construction Standard Full Text Information System
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4 Construction of Extrusion Joints
4.1 Extrusion Equipment
4.1.1 The extrusion pressure of the extruder shall be calibrated in any of the following cases: (1) Before the new extrusion equipment is used;
(2) After the old extrusion equipment is overhauled;
(3) After the oil pressure gauge is damaged or vibrated strongly; (4) When the sleeve indentation is abnormal and no other reasons can be found; (5) The extrusion equipment has been used for more than one year;
(6) The number of extruded joints exceeds 5,000. 4.1.2 The die, sleeve and steel bar shall be used in conjunction with each other, and the die shall have corresponding connecting steel bar specification markings.
4.1.3 The high-pressure pump shall use hydraulic oil. The oil shall be filtered and kept clean, and the oil tank shall be sealed to prevent rainwater and dust from mixing into the oil tank.
4.2 Construction operation
4.2.1 Operators must be certified.
4.2.2 The extrusion pressure, die width, indentation diameter or the fluctuation range of sleeve length after extrusion and the number of extrusion passes used in the extrusion operation shall all meet the technical parameter requirements determined by type inspection.
4.2.3 The following preparations should be made before extrusion
4.2.3.1 The rust, sand, oil and other debris on the ends of the steel bars should be cleaned; 4.2.3.2 The appearance and size of the sleeve should be checked; 4.2.3.3. The steel bars and sleeves should be tried out. If the steel bars have horseshoes, bends or the longitudinal ribs are too large, they should be corrected in advance or ground with a grinding wheel. Sleeves for steel bars of different diameters shall not be used interchangeably.
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4.2.3.4 Obvious positioning marks should be marked on the connecting ends of the steel bars to ensure that the length of the steel bars extending into the sleeve can be checked according to the positioning marks during and after extrusion. 4.2.3.5 Check the condition of the extrusion equipment and conduct a pressure test. Operation can only be carried out after it meets the requirements. 4.2.4 The extrusion operation shall meet the following requirements: 4.2.4.1 The depth of the steel bar inserted into the sleeve shall be checked according to the mark, and the end of the steel bar should not be more than 10mm away from the midpoint of the sleeve length;
4.2.4.2 The extruder and the axis of the steel bar should be kept vertical during extrusion; 4.2.4.3 The extrusion should start from the center of the sleeve and extruded to both ends in turn; 4.2.4.4 It is advisable to first extrude one end of the sleeve, and then extrude the other end of the sleeve after inserting the steel bar to be connected in the construction area.
4.3 Safety measures
4.3.1 When performing extrusion operations at high altitudes, the provisions of the current national standard "Technical Specifications for Safety of High-altitude Operations in Construction" JGJ80 must be observed. 4.3.2 High-pressure hoses should be prevented from being dragged under load, bent, and scratched by sharp objects. 4.3.3 The application of oil pumps and extruders should be carried out strictly in accordance with the operating procedures. 4.3.4 The use of electricity at the construction site must comply with the provisions of the current national standard "Technical Specifications for Temporary Electricity Safety at Construction Sites" JGJ46.
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Type Inspection of Extrusion Joints
1 The type inspection of extrusion joints shall comply with the provisions of Chapter 5 of the current industry standard "5.0.1
General Technical Regulations for Mechanical Connection of Steel Bars". Engineering Construction Standards Full-text Information System
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6 Construction Site Inspection and Acceptance of Extrusion Joints 6.0.1 When ribbed steel bar sleeve extrusion joints are used in the project, the technology provider shall submit a valid type inspection report.
6.0.2 Before the start of the steel bar connection project and during the construction process, each batch of incoming steel bars shall be subjected to an extrusion connection process inspection, and the process inspection shall meet the following requirements: 6.0.2.1 There shall be no less than three joint test pieces of each specification of steel bars; 6.0.2.2 The steel bar parent material of the joint test piece shall be subjected to a tensile strength test; 6.0.2.3 The tensile strength of the three joint test pieces shall meet the strength requirements in Table 3.0.5 of the current industry standard "General Technical Regulations for Mechanical Connection of Steel Bars" JGJ107; for Class A joints, the tensile strength of the test piece shall be greater than or equal to 0.9 times the actual tensile strength of the steel bar parent material. When calculating the actual tensile strength, the actual cross-sectional area of ​​the steel bar shall be used. 6.0.3 On-site inspection: The appearance quality inspection and unidirectional tensile test shall be carried out on the extrusion joint. For structures with special requirements for extrusion joints, the corresponding inspection items shall be separately indicated in the design drawings.
6.0.4 On-site inspection of extrusion joints shall be carried out according to the acceptance batch. For joints of the same grade, type and specification made of the same batch of materials under the same construction conditions, 500 joints shall be inspected and accepted as one acceptance batch. If the number is less than 500, it shall also be regarded as one acceptance batch. 6.0.5 For each acceptance batch, three specimens shall be randomly selected from the project for unidirectional tensile test according to the joint performance level required by the design. Record in the format of Appendix A and make an assessment.
When the inspection results of the three specimens meet the strength requirements in Table 3.0.5 of the current industry standard "General Technical Code for Mechanical Connection of Rebars" JGJ107, the acceptance batch is qualified. If the tensile strength of one specimen does not meet the requirements, another 6 specimens shall be taken for re-inspection. If there is still one specimen that does not meet the requirements during the re-inspection, the acceptance batch shall be removed. Engineering Construction Standard Full-text Information System
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