1. Regular rust and anti-corrosion protection
Generally, the designed service life of steel structures is 50-70 years. During the use of steel structures, the chance of being damaged due to overload is very small. Most steel structure damage is caused by corrosion that reduces the mechanical and physical properties of the structure. The “Steel Structure Design Code” has certain requirements for the anti-corrosion of steel structures that have been used for more than 25 years. Therefore, it is required that the external coating protection of the steel structure should meet the usage requirements of the steel structure. Generally, the steel structure needs to be maintained for 3 years (dust, rust, and other dirt in the steel structure should be cleaned before painting). The type and specifications of the paint should be the same as the original paint. Otherwise, the incompatibility of the two paints will cause greater harm. Users must perform planned and regular maintenance.
Methods to prevent steel structures from rusting: In the later maintenance and upkeep process, non-metallic coating protection methods are particularly commonly used. The surface of the component is protected with paint and plastic to prevent it from coming into contact with the surrounding corrosive media, to achieve the purpose of anti-corrosion. This method is effective, low-priced, has many types of coatings, a wide range of options, and strong applicability. It is not limited by the shape and size of the component. It can form a film with any shape on the surface of the component, adheres firmly, and can change with the temperature when the temperature changes. The components are telescopic and easy to use. You can also give components a beautiful color appearance.
2. Regular fire protection treatment and protection
Steel has poor temperature resistance, and many of its properties change with temperature rise and fall. When the temperature reaches between 430-540°C, the yield point, tensile strength, and elastic modulus of steel will drop sharply, and the load-bearing capacity will be lost. Necessary maintenance of steel structures must be carried out with refractory materials. Fire retardant coatings or fire retardant paint treatments have not been used previously. The fire resistance of a building depends on the fire resistance of the building components. When a fire occurs, its load-bearing capacity should be able to last for a certain period, so that people can safely evacuate, rescue materials, and put out the fire.
Fire prevention measures are: Therefore, exposed steel components should be painted with fire-retardant coatings. The specific requirements are: the fire resistance time of steel beams is 1.5 hours, and the fire resistance time of steel columns is 2.5 hours so that they meet the requirements of building regulations.
3. Regular deformation monitoring and maintenance
The damage to components caused by rust in steel structures is not only the thinning of the effective section of the components but also the “rust pits” produced on the surface of the components. The former reduces the bearing capacity of components, leading to a decrease in the overall bearing capacity of the steel structure, which is especially serious for thin-walled steel and light steel structures. The latter causes “stress concentration” in the steel structure. When the steel structure is under impact load or alternating load, brittle fractures may occur suddenly. There are no signs of deformation when this phenomenon occurs, and it is difficult to detect and prevent in advance. For this reason, it is important to monitor stress, deformation, and cracks in steel structures and major components.
Deformation monitoring and processing: If the steel structure undergoes excessive deformation during use, it indicates that the load-bearing capacity or stability of the steel structure can no longer meet the needs of use. At this time, the owner should pay enough attention and quickly organize relevant industry insiders to analyze the cause of the deformation. Propose a treatment plan and implement it immediately to prevent greater damage to the steel structure project
4. Regular inspection and maintenance of other diseases
When carrying out daily management and maintenance of steel structure projects, in addition to checking for corrosion diseases, attention should also be paid to checking the following aspects:
(1) Whether there are cracks, looseness, breaks, etc. in welds, bolts, rivets, and other joints.
(2) Whether there is excessive local deformation of each rod, web, connecting plate, and other components, and whether there is any damage.
(3) Whether the deformation of the entire structure is abnormal and whether it exceeds the normal deformation range.
Routine management, inspection, and maintenance: To detect the above-mentioned diseases and abnormalities in time and avoid serious consequences, owners must conduct careful inspections of steel structures regularly. While grasping its development and changes, we should find out the reasons for the formation of diseases and abnormal phenomena. If necessary, through correct theoretical analysis, we can determine the extent of its impact on the strength, stiffness, and stability of the steel structure, and take reasonable measures to control it.
Post time: Oct-20-2023