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Issues to be noted in the grid welding process

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Spatial structures are widely used in large-span buildings due to their advantages such as reasonable spatial force, light weight and high rigidity. 1. Pre-welding preparation should be meticulous (1) Material quality control The quality of materials such as steel, welding rods, welding wires and flux is the basis. The quality certification documents must be strictly reviewed to ensure that their varieties, specifications and performance are consistent with the design and relevant standards. For example, the Q235 and Q355 steels commonly used in grids must ensure that their mechanical properties such as yield strength and tensile strength meet the standards. The type of welding rod must match the parent material. For example, when welding Q235 steel, E43 series welding rods can be used. At the same time, the material should be inspected for appearance. There should be no defects such as cracks and interlayers on the surface of the steel, and the welding rods and welding wires should n...
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What Factors Affect Snow Loads？

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  1. Definition of Snow Load Snow load refers to the calculated snow pressure acting on the roof surfaces of buildings or structures, typically representing a spontaneous meteorological load formed by accumulated snow. The magnitude of snow load primarily depends on regional snowfall amounts derived from meteorological data, roof configurations, building geometric dimensions, and normal building usage conditions. In short, snow load is a critical factor in architectural design to ensure structural safety and stability under snow accumulation conditions. 2. Factors Affecting Snow Load Snow load significantly impacts building design across different regions, primarily through the following aspects: (1) Geographic Location and Climate Conditions: Snow load levels vary by region, requiring design parameters to be determined based on local climate and topography. For instance, high-altitude areas and mountainous regions typically experience heavier snow loads, while low-altitude areas a...
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Points of Attention for the Installation of Space Structures by the Aerial Bulk Method

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  In the installation process of space structures , the aerial bulk method plays an important role in all kinds of construction projects due to its unique adaptability. However, this method requires very high control of the construction process, and many details need extra attention. 1. Pre-construction preparation (1) Accurate measurement and positioning: before installation, the measurement of the foundation must be accurate. The axis, elevation and positional deviation of the pre-buried parts of the foundation may affect the precision of the net frame installation. It is necessary to use high-precision measuring instruments to carry out comprehensive testing of the foundation to ensure that the indicators meet the design requirements. For example, the elevation deviation of the pre-embedded parts should be controlled within a very small range, otherwise it will lead to poor connection of the net frame rods and affect the overall structural stability. (2) Material and equipment ...
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Common connection methods for space structures

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  1. Weld connection The weld connection in space structures mainly adopts arc welding, that is, at the connection of components, the high temperature generated by the arc will melt the welding rod or wire metal placed at the weld position, so that the components are connected together. Arc welding is divided into manual welding, automatic welding and semi-automatic welding. Automatic welding and semi-automatic welding can adopt submerged arc welding or gas shielded welding. 2. Ordinary bolt connection The connecting parts of ordinary bolt connection include bolt rod, nut and washer. Ordinary bolts are made of ordinary carbon structural steel or low alloy structural steel; they are divided into rough bolts and refined bolts. Rough bolts are made of unprocessed round rods, and the bolt hole diameter is 1.0 to 1.5 mm larger than the bolt rod diameter. They are simple to make and easy to install, but the performance is poor when sheared. They are only used for the connection of second...
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What precautions should be taken for waterproofing color-coated steel tiles?

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  Color-coated steel tiles are a common building material widely used for roofing. However, waterproofing is critical, especially in regions with heavy rainfall. 1. Selection of waterproofing materials Choose waterproofing coatings suitable for color-coated steel tiles to effectively prevent moisture penetration. The product employs a proprietary 12-step production process, including six grinding steps, ensuring that the fine aggregate reaches a mesh size of over 800; The emulsion uses a special blend of pure acrylic and silicone-acrylic emulsions with particle sizes less than 50 microns. During production, no more than 10% pure water is added for additive dilution (approaching 0% water addition). Before packaging, two filtration steps and one vacuum treatment are performed to ensure the finished product is free of impurities and has low bubble content. The product has a service life of over 20 years. 2. Waterproofing Construction Steps (1) Clean the base layer: Before performing...
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Typical Defects and Damage in Long-Span Bolted Spherical Node Steel Space Structures

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 1. Bolted Spherical Node Defects Threaded Hole Machining Accuracy Issues The threaded holes in bolted spherical nodes are critical components where machining precision is paramount. In actual production, issues such as positional deviations and uneven pitch frequently occur. For instance, excessive positional deviation can result in loose connections between bolts and spheres, preventing effective load transfer and degrading structural performance. Uneven pitch impedes bolt insertion and tightening, leading to insufficient preload. In large-span space frames, this may cause node loosening and compromise overall structural stability. Bolt Sphere-Member Connection Issues Bolt spheres typically connect to members via bolted joints. In practice, bolt length, diameter, and tightening torque all affect connection quality. Insufficient bolt length compromises the connection's integrity, increasing the risk of disengagement under external forces. Excessive or insufficient tightening torq...
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What are the characteristics of bolted ball grids?

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  In the current rapid development of social construction, bolt ball grids are used in many large-scale engineering construction processes. Steel structure buildings are used in many large shopping malls, office buildings, and cold storage warehouses. The steel structure of the factory is divided into light steel structure factory and heavy steel structure factory. Bolt ball grid plays an important role. So, what are the advantages of bolt ball grid? In the construction process of many large office buildings, the bolt ball grid is light in weight, has strong plasticity, uses high-strength steel, has a large span of manufacturing plant, and can be made into a structure with a large span. The bolt ball node of the grid is realized by connecting the rod and the ball through high-strength bolts. It is easy to install on site, which can greatly shorten the construction period and improve construction efficiency. In addition, the advantage of the bolt ball node of the grid is that it ha...
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