出口项目九成以上采用螺栓连接，剩下的一成什么时候才需要动火？90%+ of export projects are fully bolted. When does the remaining 10% actually need hot work?
出口钢构项目现场几乎全部采用螺栓连接，原因很直接：当地施工队未必有合格焊工，动火需要许可，质量也难以回检。
螺栓连接的要点在于分类：普通螺栓用于次要连接，高强螺栓（摩擦型）用于受力主节点——吊车梁接头、柱脚、刚架斜梁拼接。高强螺栓对接触面有要求，摩擦面不能油漆，这一条在工厂要专门处理并贴保护膜。
什么时候必须焊接？吊车梁上翼缘与制动板的连接等疲劳敏感部位，以及部分高层结构的节点。需要现场焊接时，我们会配套焊工培训与焊缝检验方案。
对业主而言，全部螺栓连接意味着：工期可控、无动火审批、后期可拆卸改造。这是钢构可搬迁优势的基础。
Export projects are almost entirely bolted on site, for simple reasons: local crews may lack certified welders, hot work needs permits, and welds are hard to re-inspect.
Bolting has classes: ordinary bolts for secondary connections; high-strength friction-grip bolts for primary nodes — crane girder splices, column bases, rafter joints. Friction surfaces must not be painted, so the factory masks them and applies protective film.
When is welding unavoidable? Fatigue-sensitive joints such as crane girder top flanges to brake plates, and some high-rise nodes. Where site welding is required, we provide welder training and a weld inspection plan.
For owners, all-bolted means controllable schedules, no hot-work permits, and future disassembly — the foundation of steel's relocatability.
上海雄岚钢结构 · 出口 60+ 国家 · EN 1090 CE 认证 · 24 小时内工程师回复
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