博文

Common connection methods for space structures

图片
  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...
发表评论
阅读全文

What precautions should be taken for waterproofing color-coated steel tiles?

图片
  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...
发表评论
阅读全文

Typical Defects and Damage in Long-Span Bolted Spherical Node Steel Space Structures

图片
 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...
发表评论
阅读全文

What are the characteristics of bolted ball grids?

图片
  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...
发表评论
阅读全文

Differences Between Space Frame Structures and Steel Trusses

图片
1. Structural Form Space Frame Structure A space frame structure is a space truss system formed by numerous members intersecting in space according to specific patterns to create multiple triangular or quadrilateral grids. These interconnected grids constitute a three-dimensional space structural system. It resembles a three-dimensional net-like structure where members crisscross in space to share loads collectively. For instance, common flat-plate space frames can be arranged in various configurations such as two-way orthogonal, two-way orthogonal skew, or three-way space frames. This structure evenly distributes loads across all members and nodes, offering superior spatial load-bearing performance.  Steel Trusses  Steel trusses are primarily planar structures. Straight members are connected at their ends through nodes to form triangular or other geometric units, which are then assembled into an integrated structure within a plane. Their shapes are relatively regular, typica...
发表评论
阅读全文

Maintenance Tips for Grid Roofs After Operation

图片
  1. Do not place heavy objects on any part of the grid roof. Because grid structures are designed based on the required loads, the specifications of the members and joints are determined based on the specified design loads. Therefore, placing heavy objects exceeding the design requirements during operation is strictly prohibited. This will cause irreversible damage to the grid structure. 2. Regularly perform corrosion protection during operation. The general design life of grid structures is 50 years. Damage from excessive loads during operation is rare. Most damage is caused by rust, which significantly reduces the cross-section of grid members and significantly reduces their mechanical and physical properties. 3.The exterior paint protection of the grid structure must meet the requirements of its operation.  Generally, maintenance is required every three years. Clean the surface of dust, rust, and other contaminants before repainting. Maintenance Methods for Grid Coatings:...
发表评论
阅读全文

Innovative application and advantages of grid structure in environmentally friendly coal shed construction

图片
In traditional coal sheds , environmental pollution problems such as coal dust and exhaust gas emissions are common, which seriously threaten the surrounding environment and people's health. In response to these problems, grid structure has emerged as an innovative solution, providing a new idea for the construction of environmentally friendly coal sheds. First, the grid structure has excellent ventilation performance. Its unique internal grid design allows air to flow smoothly, significantly reducing the accumulation of coal dust. Compared with traditional closed coal sheds, grid coal sheds perform better in ventilation, thereby effectively reducing pollution to the surrounding environment. Second, the grid structure also shows high efficiency in flue gas treatment. By equipping the coal shed with flue gas treatment equipment, such as dust collectors and desulfurization equipment, harmful substances in the exhaust gas can be efficiently captured and purified. This design not only ...
发表评论
阅读全文