1. Control of bolt installation quality.
In membrane structure engineering, bolted connections generally use strength bolts and ordinary bolts. When connecting with ordinary bolts, the number of gaskets for each bolt should not exceed 2. Bolt holes cannot be reamed through gas cutting. After tightening the bolts, the exposed threads shall not be less than 2 sections;
Before using bolts, the bolt certificate and retest form should be checked. During installation, the contact surface of the stack should be flat, the contact surface should be greater than 75%, and the edge gap should not exceed 0.8mm. The bolts should be able to penetrate freely without knocking or reaming. These bolts cannot be used as temporary installation bolts. The bolts should be tightened in one direction, and the bolts installed on the same day should be tightened last, and checked one by one after the last tightening.
2. Quality control of the painting process.
During the construction of membrane structure car sheds, the surface of the painted components before the steel structure coating should be free of foreign objects such as welding slag, oil stains, water, burrs, etc. The number of times and thickness of painting should comply with relevant design requirements.
3. Welding quality control.
Before welding the steel structure, the welding rod certificate should be checked, the welding rod should be selected according to the design requirements, and the welding rod should be used according to the manual and operating procedures. The surface of the weld seam shall be free from cracks and weld nodules. The primary and secondary welds shall not have pores, slag inclusions, or arc crater cracks. The primary weld seam shall not have undercuts or incomplete penetration. Other defects shall be subject to non-destructive testing for secondary welds according to regulations, and the welder's steel seal shall be inspected at the specified weld seam and position. Unqualified welds shall not be processed without authorization. Welds in the same part should be treated after modifying the process, and the number of repairs should not exceed two.
4. Quality control of installation of profiled steel plates.
After entering the site, the appearance and certificate of conformity should be checked, and the installation accuracy of steel components related to the construction and installation of profiled steel plates should be rechecked; When installing purlins, the coating and splashes on the welds should be cleaned, and anti-corrosion treatment should be carried out with a anti-corrosion layer. When installing color panels, they should be arranged according to the wall surface, clamped at one end, and then waterproof treated with screws at the joints of the wall panels.
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