Our country is known as the infrastructure madman, and a large number of building materials will be used in infrastructure construction. Only when the quality of raw materials is guaranteed, can the engineering results be safe.
So do you know what "thresholds" building materials go through to enter the construction site to be safe to use? Let's take rebar as an example:
The main process after the arrival of the rebar is as follows:
1. Check the qualification of the incoming steel bar production unit;
2. Check the number and model of entry;
3. On-site inspection of the factory qualification certificate and quality certificate of the steel bar with the vehicle;
4. Check the grade of the steel bar, check the nominal diameter of the steel bar, and check the grade mark on the roll;
5. Witness sampling for re-inspection;
6. It can only be used after the third-party laboratory conducts a re-inspection and passes;
What are the general contents of steel bar tags?
1. Name: such as hot-rolled ribbed steel bar, indicating that it is hot-rolled formed, ribbed steel bar;
2. Implementation standard: explain the standard for the implementation of the steel bar;
3. Grade: such as HRB400E, refers to ordinary hot-rolled ribbed steel bar, 400 refers to the yield strength of 400MPa, E represents seismic steel bar;
Batch number: the code of the factory manufacturer to produce the batch of steel bars;
Specifications: such as the number 12, which refers to the nominal diameter of 12 mm;
Weight and support: Indicate the total weight and number of steel bars in the bundle.
How to interpret the sign of rolling on the steel bar?
4e：It is the synonym of HRB400E, which identifies this as a hot-rolled ribbed steel bar with a yield strength of 400MPa and a seismic steel bar;
icon:Laigang Yongfeng's logo;
yf：Laigang Yongfeng in the "Yongfeng" initial letter;
The nominal diameter of the representative reinforcement is 22 mm;
Do you know it all?