Mechanical property

1) The mechanical properties of the steel bar should comply with the following table: nominal diameter of the grade  mm σs

Processing technology

Steel bar processing generally goes through four processes: steel rust removal; Steel bar straightening; Steel bar cutting; Steel bar forming.

When the bar joint is connected with straight thread or taper thread, it is necessary to increase the upsetting and threading process of the bar end. Rebar batching and replacement Rebar replacement

(1) When replacing the steel bar specified in the design document with a steel bar of another steel number or diameter, the following provisions shall be observed:

It should be carried out according to the principle that the design value of the bearing capacity of the steel bar is equal, and the structural requirements such as the spacing of the steel bar, the anchoring length and the minimum diameter of the steel bar should be met after the replacement.

When replacing lower grade steel bars with higher grade steel bars, it is advisable to change the diameter of steel bars rather than the number of steel bars to reduce the cross-sectional area of steel bars.

(2) When a steel bar of the same diameter is used to replace a steel bar of another diameter, the diameter change range should not exceed 4mm, and the ratio of the total section area of the steel bar after the change to the section area specified in the design document should not be less than 98% or more than 103%.

(3) When the design main reinforcement is replaced with the same steel number, the spacing should be kept unchanged, and two types of reinforcement spacing configurations with diameters larger and smaller than the diameter of the design reinforcement can be replaced.