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What are the provisions of the tie-in connection?

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(A) steel banding generally used 20 ~ 22 wire, in the allowable error range banding firm.

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        (B) steel banding joints should meet the following requirements:

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        1, the joint should not be located in the maximum bending moment of the component; lap length of the end of the distance from the steel bend, not less than 10 times the diameter of the bar.

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        2, in the tension area, the end of the round bar joints should be done hook, deformation bars can not do hook.

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        3, in the compression area, the diameter of not more than 12mm of the end of the round bar joints, and the axial compression of any diameter joints in the end of the bar, do not do hook, but the lap length should not be less than the diameter of the bar 35 times.

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        4, reinforced lap joints, should be in the center and both ends with wire tie.

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        5, the length of the tensioned bar joints should be in line with the provisions of the length of the pressure bar joints should be taken to pull the length of 0.7 times the length of joints.

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        6, the strength of the tie between the bar joints should be staggered from each other. From the center of any joint to the lap length of 1.3 times within the section of the section, there is a bandage of the force of the reinforced section of the steel cross-sectional area of ​​the total cross-sectional area of ​​the proportion of reinforced, should meet the following requirements: tension zone shall not exceed 25% ; Pressure area shall not exceed 50%.

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        7, for the use of banding frame of the cast-in-place column, the column and the column at the junction, when the use of lap joints, the allowable percentage of the joint area, agreed by the design unit, may be appropriate to relax. According to engineering experience, the column side of the steel bars for 2 to 4, in a horizontal plane joints; each side 5 to 8, the two horizontal joints; each side 9 to 12, the three horizontal joints The

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        8, lap length within the stirrup should be encrypted. When the lap is used for tension, the stirrup spacing should not be greater than 5d, and should not be greater than 100mm; when the lap reinforcement for the pressure, the stirrup spacing should not be greater than 10d, and should not be greater than 200mm (d The smallest diameter in the force bar).

 

 

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