Steel structure industry has been widely used in various fields, the most powerful resistance on the surface of the impact of structural light, beautiful appearance, high strength characteristics, easy to install, steel structure after hot-dip galvanizing (zinc), with 30 years of corrosion-resistant durable paint free maintenance, narrow, in reality, there are many factors that will lead to damage to the steel mesh, we simply analyze and reason.
1. Serious deformation
If there is serious deformation, it may be caused by falling to the ground during transportation. The reinforcing mesh is a kind of reinforcing mesh which arranges the longitudinal reinforcement and the transverse reinforcement into a right angle according to a certain distance and all welding points are welded together. It is of great significance to improve construction efficiency, structural quality, safety and reliability, and to change the traditional construction methods. The transportation of steel fabric is a very important link. In the process of transportation, there are many unknown factors (factors) that will damage the steel fabric and bring inconvenience to the installation of the steel fabric. For automobile transportation, the same size and type of codes shall be put together when loading, and good packaging shall ensure stable steel mesh transportation tools to prevent falling and other problems, friction and scratches due to unstable positions.
1. The bearing flat steel and clad flat steel of the steel mesh only have the height of the steel mesh in the direction of high strength (perpendicular to the plane direction of the steel mesh).
2. It is recommended to use nylon lifting belt for lifting. If the steel wire rope is used for hoisting, pay attention to protect the flat steel of the steel bar (steel bar) mesh edge to prevent the permanent deformation or damage of the steel bar mesh edge.
3. If the forklift is used for loading and unloading, the fork teeth shall be prevented from seriously impacting (hitting) the flat steel outside the steel mesh.
II. Under load and change
The long-term use makes the steel mesh specification change, resulting in the insufficient bearing capacity of the structure. The weight open welding deformation after installation is a problem in the production link of the manufacturer. The faulty welding and the thickness of raw materials are not up to the standard, including the design and layout of the steel mesh, the production process of the steel mesh, the installation error of the steel mesh, illegal use and operation, etc.
鋼筋網的荷載設計要求，如果鋼筋網中有缺口，則鋼筋網的剩余面積應能滿足設計荷載的要求。鋼筋網的承載要求由設計部門和用戶提出，或由設計部門和用戶直接選擇鋼筋網的規格型號。根據鋼結構(工程結構)的計算原理，對鋼網的荷載、跨度和撓度之間的關系進行了計算。對于單個操作平臺，設計負載通常為1。5kn，分布在整個面積200mm×200mm。維修平臺一般按4kN/m2的荷載分布進行設計。單人通過鋼筋網通道，其均勻分布的承載能力不小于3。0 kN / m2。雙向鋼筋網通道的承載能力不小于5。0 kN / m2。高密度步行鋼網通道的承載能力不小于7。5 kN / m2。
If there is a gap in the reinforcement net, the remaining area of the reinforcement net shall meet the requirements of the design load. The bearing requirements of the reinforcing mesh shall be proposed by the design department and the user, or the design department and the user shall directly select the specifications and models of the reinforcing mesh. According to the calculation principle of steel structure, the relationship among load, span and deflection of steel network is calculated. For a single operating platform, the design load is usually 1. 5kn, distributed in the whole area of 200mm × 200mm. The maintenance platform is generally designed according to the load distribution of 4kn / m2. The bearing capacity of single person passing through the reinforced mesh channel shall be no less than 3. 0 kN / m2. The bearing capacity of two-way reinforced mesh channel shall not be less than 5. 0 kN / m2. The bearing capacity of high-density pedestrian steel mesh channel shall not be less than 7. 5 kN / m2.
Corrosion of external materials
Due to the corrosion of chemical substances (Interpretation: decay, disappearance, corrosion, etc.) and the weakening of steel mesh section caused by electrochemical corrosion, it is recommended to adopt hot-dip galvanizing surface treatment. The weight and requirements after galvanizing shall conform to GB / T 13912-2002. The surface of the steel mesh can be hot-dip galvanized, which can improve the service life of the steel mesh, but there are still some damages. In order to prevent the damage of the steel mesh, we need to carry out daily maintenance of the steel mesh.