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Space Frame Steel Roofs: A More Cost-Effective Choice for Large-Span Buildings Than Concrete

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 When planning large-span buildings—from industrial warehouses and exhibition halls to transportation hubs—selecting the right roof system is not just a structural decision, but a financial one that impacts budgets for decades. Concrete has long been a traditional option for such projects, valued for its familiarity rather than its long-term efficiency. However, space frame steel roofs have emerged as a superior alternative, delivering cost savings that extend far beyond upfront expenses and align with the practical needs of modern large-span construction. The myth that concrete is the cheaper choice often stems from a narrow focus on material costs alone. While concrete may have a lower price per ton at first glance, this ignores the full scope of expenses that come with concrete roof installation. Space frame steel roofs, by contrast, are engineered for efficiency at every stage, starting with their lightweight and modular design. Unlike concrete roofs, which require massive, rei...
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Bolt Ball Testing Methods

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 Bolt Ball Testing Methods

bolt ball



1, bolt ball and manufacturing bolt ball nodes need materials, its varieties, specifications, performance, etc. should comply with national product standards and design requirements.
Inspection methods: check the quality of the product qualified documents, Chinese signs and inspection reports, etc.
2、Bolt ball shall not have burn, crack and crease.
Inspection method: Sample part of each specification of bolt ball, observe with 10 times magnifying glass and surface inspection.
3, bolt ball thread size and thread tolerance should be in line with the current national standard provisions.
Inspection method: check a part of each specification of the bolt ball and measure it with a standard thread gauge.
4, bolt ball diameter, roundness, adjacent two bolt hole centre line angle and other dimensions and allowable deviation should be in line with the local steel structure acceptance regulations.
5、Inspection method: Sample a portion of each specification of bolt ball and check if it conforms to the specified value with calipers and indexing head gauge.
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Classification of steel structure nodes

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