What if the steel bar forming size is not allowed?
When the error of each part of the formed steel bar exceeds the tolerance value of the quality standard, it shall be treated separately according to the force characteristics of the steel bar. If the position of the bending starting point of the bent-up reinforcement is slightly deviated or the bending angle is slightly inaccurate, technical appraisal shall be used to determine whether it can be used. If there is a significant impact on the structural performance, or the steel bar cannot be installed (such as the length or height of the steel bar exceeds the template size), it must be reworked: if it is necessary to re-open the bending position directly during rework, it is limited to reworking the Class I steel bar once, and the bending position should be carefully checked for excessive deformation or cracks.
1. Phenomenon: The length and bending angle of the steel bar do not meet the requirements of the drawing.
2. Hazard: It directly affects the size of the steel skeleton, and it is difficult to ensure the straightness and regularity of the skeleton; When there is bending reinforcement, the forming size is not allowed, which makes the bending position inconsistent with the design. Stirrups are difficult to cling to the stressed reinforcement, increasing the difficulty of binding or welding.
3. Cause analysis: inaccurate blanking; Wrong line drawing method or large error; When bending manually, the plate spacing is improperly selected. No guarantee measures were taken for angle control.
4. Preventive measures: strengthen the management of steel bar batching, pre-determine the adjustment value of the blanking length of various shapes of steel bars, and consider carefully when batching. The following line drawing method can be adopted: when drawing the segmented size of bending steel bars, deduct the adjustment value of the blanking length of different angles from the length on the opposite side of the bending operation direction, and draw the segmented size line; For steel bars with symmetrical shapes, the drawing line should start from the center point of the center of the drawing. In order to ensure that the bending angle meets the drawing requirements, under the condition that the equipment and tools cannot reach the accurate angle by themselves, the angle alignment or nailing can be drawn on the forming beam as marking measures.
For steel bars with complex shapes, it is advisable to release real samples first, and select appropriate operating parameters (such as drawing lines, plate spacing, etc.) in advance according to specific conditions, and then form large quantities.
5. Treatment method: When the error of each part of the formed steel bar exceeds the tolerance value of the quality standard, it should be handled separately according to the force characteristics of the steel bar. If the position of the bending starting point of the bent-up reinforcement is slightly deviated or the bending angle is slightly inaccurate, technical appraisal shall be used to determine whether it can be used. If there is a significant impact on the structural performance, or the steel bar cannot be installed (such as the length or height of the steel bar exceeds the template size), it must be reworked: if it is necessary to re-open the bending position directly during rework, it is limited to reworking the Class I steel bar once, and the bending position should be carefully checked for excessive deformation or cracks.
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