China is a big country in steel production and a big country in the steel structure industry, with a steel…
Prefab steel structure building designed and manufactured at the factory and assembled at the construction site using bolted connections.
Prefab Steel Structure Buildings
The Prefab steel structure composed of steel materials and is one of the main types of building structures. It mainly composed of steel beam, steel column, steel truss, and other members made of section steel and steel plate. Welds, bolts, or rivets usually used to connect the components or parts. Because of its lightweight and comfortable construction, it widely used in large factories, stadiums, super high-rises, and other fields.
Prefab steel structure building is a new type of building system. It breaks down the industry boundaries between the real estate industry, construction industry, and metallurgy industry, and gathers into a modern industrial system. It is the steel structure building system generally favored by people in the industry.
Compared with traditional concrete buildings, steel structure buildings use steel plates or section steel instead of reinforced concrete, which has higher strength and better earthquake resistance. And because of the components manufactured in the factory and installed on-site, the construction period is significantly reduced. Due to the reusable steel, it can dramatically reduce construction waste and more environmentally friendly, so it is widely used by countries around the world and used in industrial buildings and civil buildings.
At present, the use of steel structure buildings in high-rise and super high-rise buildings is becoming more and more mature, and it has gradually become the mainstream construction technology, which is the development direction of future buildings.
Judging from the current architectural form, the use of steel structures in buildings is one of the arrangements with the least impact on the urban environment. Among many building structures, when using steel structures, the steel structure building system has full advantages such as lightweight and easy installation.
The standard welding method for steel structures is arc welding, including manual arc welding, automatic or semi-automatic arc welding, and gas shielded welding.
Manual arc welding
Manual arc welding is the most commonly used welding method in steel structures, with simple equipment and flexible and convenient operation. However, the labor conditions are poor, the production efficiency is lower than that of automatic or semi-automatic welding, and the variability of weld quality is large, which depends to a certain extent on the technical level of the welder.
The quality of the automatic welding seam is stable, the internal defects of the welding seam are few, the plasticity is good, the impact toughness is good, and it is suitable for welding a long direct welding seam. Due to manual operation, semi-automatic welding is ideal for welding curves or welds of any shape. Automatic and semi-automatic welding should use welding wire and flux compatible with the primary metal. The welding wire should meet the requirements of national standards, and the flux should determine according to the welding process requirements.
Gas shielded welding
Gas shielded welding is the use of inert gas (or CO2) gas as the protective medium of the arc to isolate the molten metal from the air to keep the welding process stable. Gas arc welding has concentrated arc heating, fast welding speed, and considerable penetration depth, so the weld strength is higher than that of manual welding. And good plasticity and corrosion resistance, suitable for welding thick steel plates.
Advantages of prefab steel structure building:
1.Simple and fast construction
The prefabricated steel structure manufactured in the factory and building on the project site, save workforce, and reduce labor cost, rapid installation, shorten the construction period, and the quality is easy to ensure.
2. Lightweight steel structure
Although the bulk density of the steel structure is more significant compared with other building materials, its strength is much higher. Therefore, when the load and conditions are the same, the steel structure is lighter than other building materials, easy to transport and install, and can span more Large span.
3. Good plasticity and toughness
The steel structure is generally not suddenly broken and damaged due to accidental overload or local overload. Good toughness makes the steel structure more adaptable to dynamic loads. These properties of steel provide a sufficient guarantee for the safety and reliability of the steel structure.
4. Lower comprehensive cost
The stable supply of steel makes the price fluctuations very small. Use thin-walled light-steel structured walls to maintain excellent flatness. It also means that when you nail the wall with nails, there is no rebound and shrinkage. It is because the material can be cut to the required length in advance, so the waste of resources reduced to a certain extent.