1、Analyses to detect the steel structure of building material Abstract: the article briefly introduces the construction steel structure material properties and detection methods, focusing on the steel structure detection method and quality detection method in this paper, the analysis, to ensure the qu
2、ality of light steel structure, steel structure material performance into full play. Key words: steel structure inspection； Steel structural materials； Quality inspection； Quality evaluation Steel structure detection in individual ascension detection technology at the same time, pay attention to the
3、 development and implementation of integration, perfect the complete steel structure detection technology, including steel mechanical properties tests (tensile, bending, impact, hardness) fasteners, mechanical performance testing, steel structure (sliding resistance coefficient, axial force), steel
4、metallurgical testing analysis, microstructure analysis, micro-hardness testing), steel, chemical composition analysis, nondestructive testing, steel structure steel structure stress testing and monitoring, coating testing such as complete sets of testing technology. A, steel structure material From
5、 the use point of view, strength, plasticity, weldability and cold short destructive is building the basic performance of steel. Monomial index of the material does not represent all of its features, must be based on the comprehensive evaluation indicators of routine test. Assessment should also col
6、lect the following data for reference data: in the steel production of time, the supply of steel technology condition and product specifications. Must find out the steel grades, technical indicators, ultimate strength, yield strength, tensile elongation, cold, repeated bending, impact toughness, and
7、 chemical composition, etc. Material inspection including steel profiles (including welding h-beam, welded pipe), welding, bolts ball and connection fasteners testing, material, welding, bolts ball is the basic elements of steel structure engineering, its quality is directly related to the quality o
8、f the project. Profiles, it is material to grow milling width of specimen and then stretch the cold bending test, the physical properties testing； Welding ball is must be the diameter of the pipe welding according to the standard, then the tensile compressive tests are carried out； Very similar to t
9、he bolt and the welding ball, but no compression test； Connection fasteners, mainly is the high strength bolts for us. High strength bolt mainly control the quality of the project including the minimum load detection, pretension the reinspection, torque, the reinspection torque coefficient and coeff
10、icient of slip resistance test. Steel material mechanical test and chemical analysis results, should comply with the provisions of the corresponding procedures. B, steel structure detection (a) steel structure thickness of section is measured by thickness gauge Steel structure because of the influen
11、ce of the processing accuracy and section of corrosion, the steel structure of the section thickness is often some changes. Especially corrosion section thinning, bearing capacity decreased, the structure safety degree of influence is very big. Therefore, thickness of section steel structure determi
12、nation is an important task. At present, the thickness measurement is a kind of caliper, one is thickness is measured by thickness gauge. Described below using ultrasonic thickness gauge Numbers of cross section thickness measuring method. The ultrasonic pulse reflection method. Ultrasonic spread fr
13、om a homogeneous medium to another kind of homogeneous medium, boundary will occur on the surface of acoustic reflection, from the launch of the ultrasonic probe, after a delay block into the piece under test, ultrasonic wave arrived at interface, and be reflected back, be received through delay blo
14、ck and probe receives, measured between the transmitted pulse to the received pulse time, deduct the delay time, according to the relationship between sound velocity, time, distance, and the thickness of the piece being tested. That is, the thickness of the instrument display values. Such as 1.2 100
15、 instrument shows a value of 20.88 mm, 20.88 mm, the accuracy is 0.01 mm. (2) the steel structure coating thickness measurement And in identification of steel structure coating quality and coating thickness is an important parameter, therefore determination of coating thickness is an important proje
16、ct. Coating thickness measurement generally magnetic thickness tester is used to test, have the product at home and abroad. Domestic magnetic coating thickness gauge material testing in tianjin factory of the product, name is QCC - type A magnetic thickness gauge. With magnetic thickness gauge, adju
17、sted the instruments, make it has normal work performance. Must first determine the measurement range, the first leg of 0 50 microns, the second leg of 0 500 microns. When measured in the probe contact coating to be tested. Determination of first to remove the coating surface dirt and oil, in case i
18、nfluence precision. When testing coating according to the specific circumstances to determine, first, through the instrument to determine presence of coating, because coating under the action of a long-term environmental damage until disappear coating, coating or not is an important parameter of coa
19、ting. Because the presence of residual coating is an important structure corrosion level line, is also a permanent evaluation of important boundaries. (3) the steel structure roof deflection measurement General span steel roof truss is larger, such as 21, 24, 30 m), measuring the deflection of more
20、difficult, have to use a lot of force to pull the wire, and wire request has a certain tensile strength. When measuring the key to seize steel wire straightening, the measurements are accurate. At the same time, it is better to have a completed record, the original steel roof truss ever an arch or d
21、eflection value after construction. The two values was determined to determine roof stress and deflection under load values. Often due to construction installation, of course, there is the arch, arch after still have after use, the measured deflection value is negative deflection, as a result, the m
22、easured values must indicate the positive and negative value. When the deflection is measured to determine best protection, namely, general in the cross point is determined. Such as the clinometer determination of drawn steel wire in case of obstacles in the middle. Such as Angle steel, wire, etc.,
23、must be in advance expenditure point on both ends right now, in order to make steel wire straightening. Advance expenditure point, measure the deflection values must be minus the average of the two fulcrum height, is the actual deflection value. Endpoints at the same time to ensure that the span of
24、a fixed position, and both ends have the specialist master mark endpoint endpoint and fixed position and the actual roof endpoint of the distance, in order to the actual measurement of the deflection of span value. C,The quality of the steel structure inspection and evaluation Geometry size deviation, the nonlinear components, the structure is the poor quality of the welding and riveting, primer and paint quality is bad, is the main defect
