Steel grating has been widely used in various fields of industry, and has the strongest resistance to surface impact. It has the characteristics of light structure, beautiful appearance, high strength, and easy installation. The surface of steel grating is hot-dip galvanized, with 30 In fact, there are many factors that can cause damage to steel gratings, which are durable and paint-free maintenance. We will analyze the reasons briefly.
Severely deformed steel grating
If there is serious distortion, it may be caused by falling to the ground during transportation. The transportation of steel grating is a very important link. There are many unknown factors in the transportation process that will damage the steel grating and bring inconvenience to the installation of the steel grating. When loading and transporting, it is necessary to put the same size, type and number together, and pack it well to ensure the stability of the steel grating during transportation, and prevent problems such as falling, friction, and scratches due to unstable placement.
Precaution:
1. Steel grating bearing flat steel and edging flat steel have high strength only in the height direction of the steel grating (perpendicular to the plane direction of the steel grating), and unreasonable lateral force will cause deformation or damage.
2. It is recommended to use nylon hoisting belts for lifting and unloading. If steel wire ropes are used for hoisting, care should be taken to protect the flat steel on the edge of the steel grating to prevent permanent deformation or damage to the outside of the steel grating.
3. If the forklift is used for loading and unloading, the fork tines should be prevented from seriously impacting (impacting) the flat steel outside the steel grating.
Insufficiency and change of steel grating load
Long-term use makes the steel grating specifications change, resulting in insufficient structural bearing capacity. After installation, the welding deformation caused by heavy objects is the problem in the production process of the manufacturer, such as virtual welding, the thickness of raw materials is not up to standard, etc., including steel grating design and layout, steel grating production process, mistakes in steel grating installation, violations of regulations, etc. use and operation, etc.
The load design of the steel grating requires that if there is a cut in the steel grating, the remaining area of the steel grating should meet the design load requirements. The load requirements of the steel grating shall be proposed by the design department and the user, or the specification and model of the steel grating shall be directly selected by the design department and the user. The calculation of the relationship between steel grating load, span and deflection is carried out according to the principles of steel structure calculation. For a work platform operated by one person, the design load is usually 1.5 kN, distributed over the entire area of 200mm × 200mm. The maintenance platform is generally designed according to the uniform load of 4kN/m2. The steel grating passage for single person shall have a uniform load capacity of not less than 3.0 kN/m2. For steel grating passages with two-way traffic, the uniform load capacity shall not be less than 5.0 kN/m2. For steel grating passages where high-density people walk, the uniform load capacity shall not be less than 7.5 kN/m2.
Corrosion of foreign substances
Due to the corrosion of chemical substances and electrochemical corrosion, the section of steel grating members is weakened, so it is recommended to use hot-dip galvanized surface treatment. The weight and requirements after galvanizing shall comply with the provisions of GB/T 13912-2002. The surface of the steel grating can be hot-dip galvanized, which can improve the life of the steel grating, but there is still a certain amount of damage. To prevent the steel grating from being damaged, we need to do a good job in the daily maintenance of the steel grating.
Other reasons
Due to various accidental deformations, twists and depressions of the steel grating, the cross-section of the components is weakened, the rods are warped, and the connections are cracked.
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