Overview
The bolt ball grid structure is a prefabricated space frame system composed of spherical nodes (bolt balls) interconnected by steel pipes using high-strength bolts. Developed in the mid-20th century, it revolutionized large-span architecture by enabling column-free designs with high strength-to-weight ratios. Common in stadiums and industrial buildings, its modular nature allows rapid assembly and adaptability to complex geometries. The system meets international standards like GB/T 16939-2016 (China) and ISO 10721 for structural steelwork.
Structure and Working Principle
Each bolt ball, typically 100–300 mm in diameter, serves as a nodal point with threaded holes to connect steel pipes (Φ48–Φ219 mm). The pipes transmit axial forces, while the bolts ensure rigid joints. Finite element analysis (FEA) optimizes load distribution. The structure’s stability relies on triangulated configurations, which minimize bending moments. Advanced designs incorporate seismic resistance by using ductile materials and flexible joints. On-site assembly follows strict torque specifications (e.g., 400–600 N·m for M20 bolts) to prevent loosening.
Key Features
1. **High Load Capacity**: Supports up to 500 kg/m² snow loads and 150 km/h wind speeds due to uniform stress distribution. 2. **Corrosion Resistance**: Hot-dip galvanizing (≥80 μm coating) or epoxy painting extends service life to 50+ years. 3. **Design Flexibility**: Adapts to curved or free-form surfaces, enabling architecturally innovative projects like the Beijing Olympic Stadium. Compared to welded grids, bolt ball systems allow easier disassembly and reuse, reducing lifecycle costs. Their lightweight nature (20–40% lighter than concrete alternatives) also lowers foundation requirements.
Application Areas
1. **Sports Venues**: Ideal for stadium roofs (e.g., Shanghai Stadium) due to clear spans exceeding 200 m. 2. **Transport Hubs**: Used in airport terminals (e.g., Beijing Daxing Airport) for vibration resistance and aesthetic appeal. 3. **Industrial Plants**: Facilitates crane runway integration and heavy equipment support. Emerging applications include solar panel mounting structures and temporary event pavilions, where quick deployment is critical. The system’s scalability makes it suitable for projects ranging from 500 m² to 50,000 m².
Maintenance and Precautions
Routine inspections should check for bolt corrosion, deformation, or loosening, especially in coastal or high-humidity environments. Ultrasonic testing detects cracks in critical nodes. Avoid welding modifications post-installation, as heat affects bolt preload. For seismic zones, use energy-dissipating devices like viscous dampers. Cleaning debris from ball sockets prevents premature wear. Maintenance cycles vary but typically include biennial torque checks.
B2B Procurement Guide
1. **Supplier Qualifications**: Prioritize manufacturers with Class I steel structure certification (China GB standard) or EN 1090-1 (EU). 2. **Customization**: Provide CAD drawings early; lead times average 4–8 weeks for 1,000-ton projects. 3. **Logistics**: Modular packaging (bundles ≤3.5 tons) optimizes shipping; confirm on-site handling equipment availability. Cost-saving strategies include bulk purchasing (5+ projects) and opting for Q235B steel where permissible. Always request mill test reports (MTRs) for material traceability.
Related Manufacturers
- 主营：钢结构网架、球形网架、网架加工、加油站9网架
- 主营：加油站网架罩棚、网架加工、煤棚网架、加油站网架、SF双层储罐、膜结构工程
- 主营：管桁架、大跨度煤棚、管桁架加工、煤棚网架、储煤棚网架、屋面网架、屋顶网架、球形网架、螺栓球网架、加油站网架、焊接球网架、大跨度网架、干煤棚网架、风雨操场网架、网架加工、球形网架加工、厂房网架、体育馆网架、煤棚网架加工、加气站网架罩棚、电厂煤棚网架、收费站网架、钢结构厂房、管桁架结构
- 主营：通风系统、篮球馆网、高铁站房、钢网架、球形网架、网架制作、网架工程、钢屋顶网架、螺栓球网架、体育馆网架、干煤棚网架、煤棚网架配件、钢结构网、空间结构、钢筋笼吊具、球形干煤棚
- 主营：螺栓球网架、不锈钢网架、干煤棚网架、体育馆网架、网架配件、钢结构设计
- 主营：网架加工、螺栓球网架、煤棚网架、风雨操场网架、机场网架、加油站网架、球形网架、焊接球网架、收费站网架、储煤棚网架、干煤棚网架、料场网架、屋面网架、电厂网架、厂房网架、球形网架加工
- 主营：网架加工、煤棚网架、干煤棚网架、储煤棚网架、大跨度网架、球形网架、焊接球网架、螺栓球网架、加油站网架、加油站网架罩棚、收费站网架、风雨操场网架、球形网架加工、料棚网架、电厂网架、螺栓球网架加工、焊接球网架加工、煤棚网架加工、体育馆网架、钢网架、钢网架加工、异形网架、异形网架加工、屋面网架、大跨度煤棚
- 主营：异形网架、厂房网架、机库网架、屋面网架、篮球馆网架、高铁站网架、体育场网架、螺栓球网架、采光顶网架、加气站网架、游泳馆网架、加油站网架、飞机场网架、储煤棚网架、风雨操场网架、会展中心网架、煤棚网架、公路收费站网架、网架加工、网架设计、储料棚网架、充电站网架
- 主营：屋面网架、煤棚网架、加油站网架、大跨度网架、体育馆网架
- 主营：网架、网架加工厂、网架加工、大跨度网架、球形网架、螺栓球网架、厂房网架、煤棚网架、体育馆网架、高铁站网架、户外网架、管桁架
- 主营：网架屋面、球形网架、网架生产、网架安装工程、钢结构网架、网架顶棚、干煤棚网架、体育馆网架、游泳馆网架、车站网架、各类场馆网架、车间网架顶棚
- 主营：网架工程、网架制作、钢结构、管桁架
- 主营：煤棚网架、加油站网架、螺栓球网架、网架
- 主营：干煤棚、数控钢板、体育场馆、螺栓球、球网架、棚网架、球形网架、钢管网架、网架制造、网架图纸、安装网架、精选网架、网架制作、机场网架、华凯网架、网架定制、网架配件、网架加油站、不锈钢网架、钢结构网架、钢板下料、安装定制、定制加油站
- 主营：网架加工、球形网架、体育馆网架、加油站网架、煤棚网架、螺栓球网架、焊接球网架、收费站网架、干煤棚网架、储煤棚网架、厂房网架
- 主营：集装箱、活动房、集装箱房、拱形钢结构网架、活动箱房、钢结构、移动箱定制、住人集装箱、创意集装箱房、移动厕所、集装箱厂家、集装箱活动房、活动板房、集成房屋、网红箱、网红集装箱、网红商业街、网红商铺
- 主营：网架封板、网架安装、工程网架、网架锥头、螺栓球网架、储煤棚网架、干煤棚网架、健身馆网架、工业厂房网架、封闭料场网架、原料厂大棚网架、八方钢构、管桁架结构
- 主营：金属拉网机、红夹克潜油泵、阻隔防爆材料、网架、网架安装、双层油罐、sf油罐、FF油罐、防爆阻隔网、加油站建设、加油站雨棚、双层复合管道、潜油泵、国产潜油泵、潜油泵控制柜、三金加油机、英高加油机、正星加油机、加油机税控、加油车改造、防爆油罐、防爆网、氧舱、微压氧舱、加油站改造
- 主营：网架加工、螺栓球网架、球形网架、煤棚网架、大跨度网架、管桁架加工