Main content of steel structure building inspection

1. Detection of cross-sectional thickness of steel structures

The thickness of steel structure sections is often influenced by the precision of processing and the rusting of the sections. Especially rust can cause thinning of the section and a decrease in load capacity, which has a huge impact on the safety of the entire steel structure. Therefore, measuring the cross-sectional thickness of steel structures is a very important task.

European standard H-shaped steel

Currently, a thickness gauge is commonly used to measure the thickness of the section. Using ultrasonic pulse reflection method. When ultrasonic waves propagate from one uniform medium to another, reflection occurs. When the ultrasonic waves from the probe reach the interface, they are reflected back and received by the receiving probe. Calculate the thickness of the tested object by measuring the time between the emission pulse and the reception pulse.

2. Measurement of coating thickness for steel structures

In the identification of steel structures, the quality of the coating will directly affect the firmness of the steel structure. Generally, the thickness of the coating is measured using a magnetic thickness gauge. When using a magnetic thickness gauge, it is necessary to adjust the instrument in advance so that it can work properly. First, determine the measurement range. Next, the measurement should be carried out by first removing dust and oil stains from the surface of the coating to prevent affecting accuracy. Then, the probe should be used to contact the tested coating.

Based on the actual situation, first determine whether there is a coating. Due to long-term natural environmental impact, the coating may be damaged or even disappear. Because the presence or absence of residual coatings is an important limit for the degree of structural corrosion.

European standard H-shaped steel

3. Deflection measurement of steel structures

Steel structures generally have a large span, making it difficult to measure deflection. It is necessary to use a large amount of force to tighten the steel wire, and it is also required that the steel wire has a certain strength, and completion records and reverse arch or deflection values should be kept. Because only by determining these two values can the stress deflection value of the roof truss under load be determined, a large number of steel structure deflection measurements in China have started to use level gauges and total stations: level gauges have high-quality telescope optical systems, sturdy and stable instrument structures, high-precision micrometer devices, highly sensitive tube level devices, and high-performance compensation devices. The characteristic of the total station is an automated, digital, and three-dimensional coordinate measurement system that combines automatic ranging, angle measurement, calculation, and data processing, as well as automatic recording and transmission functions.

4. Quality Inspection and Evaluation of Steel Structures

During the manufacturing of steel structures, there are the following shortcomings: dimensional deviation, nonlinearity of components, low quality of structural welding, jointing, and riveting, and poor quality of primers and coatings. Due to the existence of these defects and their mutual influence, both the overall and local parts of the structure will be subject to varying degrees of damage.

European standard H-shaped steel

5. Detection of defects and dents in steel structures

Ultrasonic and electromagnetic methods are commonly used in the detection of defects and dents in steel structures. When inspecting steel structures, checking the material of the steel structure is an important aspect. A good method is to take samples from non main stress areas of the structure for testing, in order to determine the corresponding strength indicators.

European standard H-shaped steel