Bending steel bar refers to the steel bar bent at the bearing to resist the bending moment of the bearing. The advantage of this method is to save the amount of steel bars and the project cost. However, with the increase of labor cost, this method has little effect on saving engineering cost. At present, it is generally a junction box, and now the only place where bending steel bars are generally arranged is a cantilever structural member.
production requirement
Stirrups made of round steel should have hooks (semicircle, right angle or oblique hook) at their ends. The bending inner diameter of the hook should be greater than the diameter of the steel bar and not less than 2.5 times the diameter of the stirrup. For general structure, the bending angle of stirrup hook should not be less than 90, and the length of straight part of hook should not be less than 5 times of stirrup diameter.
For structural members with seismic fortification requirements, the joints of circular stirrups must be welded, and the welding length should not be less than 10 times the diameter of stirrups; At the end of rectangular stirrups, there should be a hook of 135, and the length of the straight part of the hook extending into the core concrete should not be less than 20cm.