Main body quality control of steel structures. Building steel components are subject to strict quality control during installation. In the construction of columns and beams, it should be ensured that the horn under the column bottom plate is solid and flat, with good flatness, vertical and displacement of the pillars, vertical, straight, lateral bending of the beam, tightening of the bolts and friction surface cleaning. After the acceptance is passed, the lifting operation is carried out. When the installation of the steel structure constitutes a fixed part of the space and the acceptance process is completed, the construction unit shall carry out the second pouring of the space of the pillar bottom and the foundation top surface with the expanded concrete to ensure its compactness. In the installation of bolts, steel structures usually use high-strength bolts and ordinary bolts. For ordinary bolts, one end of the bolt shall not exceed 2 shims when connecting. The bolt holes shall avoid the use of gas cutting and reaming. After the bolt is tightened, the exposed thread must be less than 2 pitches; the high-strength bolt must check the product certificate before installation and For the re-examination, the contact surface of the stack must be flat when the installation is completed, and the contact surface must not be lower than 75%. In addition, high-strength bolts cannot be installed by tapping and reaming. In the construction of steel structure, it is necessary to ensure that the foreign matter such as welding slag, oil stain, water and burrs on the surface of the component before painting is completely clear, and the number and thickness of the brushing must comply with the relevant design specifications. We focused on international export product development, production and sales. We have improved quality control processes of Crystal Roller Shutter Door to ensure each export qualified product. Commercial Rolling Up Door,Roller Shutter Door for Shop,Crystal Roller Shutter Door,Commercial Roller Shutter Doors Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hffastdoor.com
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