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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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Differences Between Space Frame Structures and Steel Trusses

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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...
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Maintenance Tips for Grid Roofs After Operation

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

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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 ...
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Steel Structures in Airport Terminals — Creating Safe, Spacious, and Modern Air Hubs

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 Airport terminals are among the most complex buildings in the world. They require large, open spaces, heavy passenger traffic capacity, high safety standards, and the flexibility to adapt to future aviation demands. To meet these engineering and architectural challenges, steel structures have become the preferred solution in airport construction worldwide. From long-span roofs to modern architectural forms, steel provides the ideal combination of strength, aesthetics, and efficiency , helping airports operate smoothly while maintaining an impressive visual identity. 1. Why Airport Terminals Need Steel Structures Airports serve millions of travelers every year and must maintain strict performance requirements. Terminal buildings need: Wide column-free spaces to accommodate crowds, luggage systems, and commercial areas Large-span roofs that cover long check-in halls and departure lounges Durability to withstand constant use and environmental exposure Flexibility f...
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Steel Structures in Logistic Warehouses — Maximizing Storage and Efficiency

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 In today’s globalized supply chain, logistics warehouses are more than just storage facilities — they are the backbone of modern commerce . From e-commerce fulfillment centers to cold-chain storage, the demand for large, flexible, and efficient warehouse spaces has never been greater. To meet these requirements, steel structures have become the industry standard, offering unmatched advantages in speed, durability, and cost-efficiency. 1. The Growing Importance of Logistics Warehouses The rapid expansion of online retail and global trade has transformed warehouse design. Modern facilities must handle: High storage capacity for diverse goods and materials. Efficient internal movement , including conveyors, forklifts, and automated systems. Large clear spans , eliminating interior columns to maximize usable space. Sustainability goals , reducing energy use and environmental impact. Steel structures are ideally suited to deliver on all these needs, combining engine...
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