The location of the mechanical connection

Rebar joints should be set up with a small force of staff. The same longitudinal tendon should not be established by two or more joint forces. The connecting end bar is bent by not less than 10 times the bar diameter from the starting point.
Inspection Quantity: Full inspection.
Test method: observation, steel rule inspection.
1. At the construction site, the current national standard "General Technical Regulations for Mechanical Connections" JGJ107, "Steel Welding and Acceptance Procedures" JGJ18, the mechanical connection joints of steel bars, the appearance inspection of welded joints, and the quality of the welded joints should comply with the relevant procedures.
Inspection Quantity: Full inspection.
Test method: observation.
2 When the body is set with steel joints or welded joints within the same joint, the force connections should be staggered from each other.
The length of the mechanically connected joints and welded joints of the longitudinal force reinforcement is 35 times the maximum diameter of the longitudinal force d (four sections) and not less than 500mm, where the connectors are the joints in the joint section at the midpoint of the length of the pair and belong to the same connection part. In the same connection section, the vertical force of the mechanical connection and the percentage area of the vertical joint within the section of the force of the welded joint of the steel bar are compared with the force of the cross-sectional area of all longitudinal reinforcement ratios.
For the same connection part, the longitudinal reinforcement shall meet the design requirements for the area percentage of the joint force. If there is no specific requirement in the design, it shall meet the following requirements:
1. In the tension zone should not be greater than 50%;
2. The joints should not be set in the earthquake-proof frame. The beam-column requirements end stirrup densification area, when you can't escape the right, high-quality equal-strength mechanical connection joints, it should not be greater than 50%;
3. Dynamic loads directly applied to structural members, improper use of welded joints, and body joints when used should not exceed 50%.
Check numbers: on the same inspection lot, beams, columns and independent foundation pairs, yes 10% the number of random components, not less than 3; on the wall and group discussion, it should be a representative natural room -10 %, not less than 3, for large spatial structures, the walls next to the shaft, which may diverge between 5 m so high or the side panels of the inspection can be divided into longitudinal and transverse shaft surfaces for inspection, sampling 10%, and There are at least 3 aspects.
Test method: observation, steel rule inspection.
3 The components of the same longitudinal force in adjacent whipping steel lap joints should be staggered from each other. Lap joints bound in transverse reinforcement and the diameter is not less than the spacing, not less than 25mm.
The 1.3ll length of the steel lashing lap connection section (the length of a single lap is 1.1), where 1 lap is combined at the midpoint of the length of the connected section, may belong to the same link in the lap section. In the same connection section, the percentage of the joint area of the longitudinal reinforcement for a ring joint is the ratio of the sectional area of the cross-sectional area of the longitudinal reinforcement cross-sectional area of all strengths of the inner longitudinal reinforcement to the lap joint.
In the same connection section, the percentage of longitudinal tension in the field of a circle of strengthening cooperation shall meet the design requirements, and when the design has no specific requirements, it shall meet the following requirements:
1. In beam, slab and wall structures, not more than 25%;
2. Right-column structure, no more than 50%;
3. When it is necessary to increase the joint area percentage of the project, the beam structure should not exceed 50%, and other parts can be relaxed according to the actual situation.
The minimum overlapping length of steel combined forces of the longitudinal belt circle shall be consistent with the requirements of Appendix B of this specification.
Check numbers: on the same inspection lot, beams, columns and independent foundation pairs, yes 10% the number of random components, not less than 3; on the wall and group discussion, it should be a representative natural room -10 %, not less than 3, for large space structures, walls next to the axis, may diverge between 5 m so high or check that the side panels may be divided into vertical and horizontal lines for surface inspection, sample 10%, and have at least 3 aspects.
Test method: observation, steel rule inspection.
4 In beams and columns, stirrups should be arranged for the length of longitudinal reinforcement force within the range required by overlapping design of the components of beams and columns. When the design has no specific requirements, the following requirements shall be met:
1. The diameter of the ring steel stirrup is not less than 0.25 times, and the diameter is larger;
2. The spacing of steel stirrups in the tension section of a circle should not exceed 5 times, and the diameter should be smaller than 100mm;
3. The compression ring section should not be larger than 10 times the ring steel, and the pitch stirrup with a smaller diameter should not be larger than 200mm.
4. When the longitudinal reinforcement of the column is greater than 25 mm, the larger diameter should be 100 mm away from the joint at the end of the two circles, and the two stirrups should be set up within the range, which may be an ideal range with a spacing of 50 mm.
Check numbers: on the same inspection lot, beams, columns and independent foundation pairs, yes 10% the number of random components, not less than 3; on the wall and group discussion, it should be a representative natural room -1