Three connection methods of steel structure building

The connection methods of steel structure buildings include welding, ordinary bolt connection and high-strength bolt connection.

1. Welding

Steel rulers, welding materials, welding methods, etc. used by the construction unit shall be evaluated for welding procedures. Welders should pass the examination and obtain a qualification certificate, and should perform welding operations within the approved range, and it is strictly forbidden to work without a certificate.

Welding: Welding defects of steel structures are usually divided into cracks, voids, solid inclusions, lack of fusion, incomplete penetration, shape defects and other defects other than the above. The main treatment method is: produce the weld metal at the defect, and carry out repair welding.

2. Ordinary bolt connection

Drilling, punching, hole washing, reaming, etc. can be used for hole making, and gas cutting can also be used for larger diameter or elongated holes. Gas cutting and reaming are strictly prohibited. Drilling and punching are one-time hole making (among them, the thickness of the punched hole should be ≤ 12mm), milling, reaming, etc. are secondary hole making, that is, secondary processing of holes is performed on the basis of one-time hole making. The method of gas cutting hole making is used. In actual processing, the circular hole with a diameter of more than 80mm is generally used. When drilling cannot be realized, gas cutting can be used to make holes. In addition, for long round holes or special-shaped holes, it is generally possible to drill first and then use gas cutting to make holes. method.

3. High-strength bolt connection

High-strength bolts are usually divided into friction connection, tension connection and pressure connection according to the connection form. Among them, the basic steel structure connection method is widely used in the friction connection. The treatment methods for the friction surface of high-strength bolt joints usually include sandblasting, pickling, grinding wheel grinding and wire brushing for manual rust removal. The treatment process can be selected according to the requirements of the design anti-slip coefficient, and the anti-slip coefficient must meet the design requirements.