Before steel binding, be familiar with the drawings carefully, check whether the ingredient list is different from the drawings and design, and carefully check whether the size and heart of the finished product are consistent with the blanking list, and binding can be carried out only after it is verified. ?
When the steel bar diameter of the beam is equal to or greater than 22㎜, welded joints should be adopted, and when it is less than 22㎜, binding joints can be adopted, and the lap length should comply with the regulations. The distance between the end of the lap length and the bend of the steel bar should not be less than 10 times the diameter of the steel bar.
The binding joint should not be located at the maximum bending moment of the component, and the reinforcement should be fastened with iron wire at the center and both ends.
Extended data
Reinforcement binding of cast-in-place reinforced concrete structures is usually carried out on site. In general, there are certain rules for steel bar binding. For example, to tie the steel frame, first put the long steel bars in place, then put on stirrups, initially tie them into a skeleton, and finally complete the binding points.
Steel binding directly determines the internal structure of concrete, and the matters needing attention are as follows:
1, determine the spacing and position of main reinforcement and distribution reinforcement, put the stressed main reinforcement first, and then put the distribution reinforcement.
2. When there is a plate beam in the cast-in-place slab, the steel bar of the plate beam should be bound first, and then the steel bar should be placed.
3. If it is a double-deck slab, horse stool reinforcement should be added between the two layers of reinforcement to ensure the uniformity of reinforcement in the thick concrete slab.
4. Reinforcing bar shall be padded with mortar pad with the spacing of 1.5m, and the thickness of pad is equal to the thickness of protective layer.
5. The arrangement of steel bars adopts the principle of "fine bars are dense", and the practice of small diameter but dense arrangement can be adopted, which is beneficial to stress.
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