Reinforcing measures for steel structures

When the steel structure is damaged, we need to find and solve the problem immediately. The main factors for the damage to the steel structure are: 1) Insufficient bearing capacity of the structure caused by load changes, extended service, and changes in codes and regulations; 2) The components are deformed, twisted, disabled, dented, etc. due to various accidents, resulting in weakened sections of components, warped rods, and cracked connections; 3) Deformation, cracking and warping of components or connections caused by temperature difference; 4) The cross-section of steel structural members is weakened due to corrosion caused by chemical corrosion and electrochemical corrosion; 5) Others include mistakes in design, production, construction, and illegal use and operation during the service period. There are mainly three types of reinforcement technical measures for steel structures: 1) Cross-section reinforcement method: Reinforce with steel in part or along the whole length of the member, and connect them into a whole to make them bear common force; 2) Change the calculation diagram: add additional supports, adjust the load distribution, reduce the level of internal force, force the displacement of the statically indeterminate structural supports, and reduce the stress peak; 3) Prestressed cable method: use high-strength cables to reinforce weak links in the structure or improve the overall bearing capacity, stiffness and stability of the structure.

10

2022

/

06

Introduction of welding rod

The electrode (covered electrode) is to apply the coating (coating) evenly and centripetally on the welding core outside the metal welding core. The welding core is the metal core of the electrode. In order to ensure the quality and performance of the weld, there are strict regulations on the content of each metal element in the welding core, especially the content of harmful impurities (such as sulfur, phosphorus, etc.), which should be strictly The limit is better than that of the base metal. The electrode is composed of two parts: the welding core and the coating. Different types have different solder cores. The composition of the weld core directly affects the composition and properties of the weld metal, so the harmful elements in the weld core should be as few as possible. For the welding core of carbon steel and low alloy steel, low carbon steel is generally used as the welding core, and manganese, silicon, chromium, nickel and other components are added (see the national standard for welding wire G1300-77 for details). The reason for using low carbon is that, on the one hand, when the carbon content is low, the plasticity of the steel wire is good, and the wire drawing is easier; Good for overhead welding. The addition of other alloying elements is mainly to ensure the comprehensive mechanical properties of the weld, and also has a certain effect on the welding process performance and removal of impurities. For high alloy steel and other metal materials such as aluminum, copper and cast iron, in addition to the requirements of the welding core composition to be similar to that of the metal to be welded, the content of impurities should also be controlled, and some specific alloying elements are often added according to process requirements. The electrode is a melting electrode coated with a coating for electrode arc welding. It is composed of a coating and a welding core. The coating at the front end of the electrode has a chamfer of about 45°, which is to facilitate arc striking. There is a section of bare welding core at the tail, which accounts for about 1/16 of the total length of the electrode, which is convenient for the welding tongs to hold and conduct electricity. The diameter of the electrode actually refers to the diameter of the welding core) is usually 2, 2.5, 3.2 or 3, 4, 5 or 6mm and other specifications, the most commonly used are small 3.2, small 4, small 5, its length "L" "Generally between 200 and 550 mm.

10

2022

/

06

< 12 >
图片名称

Messages

If you are interested in our products and want to know more details, please leave a message here, we will reply you as soon as possible.

submit