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重钢五厂节能改造二期工程需对原精整厂房进行技术改造。精整厂房为单层双跨,跨度是27米,梯形钢屋架(局部屋架有天窗),3×6米大型屋面板自防水屋面。根据工艺要求,需要在6米柱距的柱列建三个柱距为18米的大跨。鉴于各种条件的限制,改18米大跨的工程需利用五厂中修施工,预定中修时间为25天时间。目前,重型屋面(钢屋面或钢筋混凝土大型屋面板屋面)的厂房柱距改造的常规方法是:把原6米柱距改为12米柱距,拔柱一根,采用顶托拟拔柱上的屋面系统,保持原
The second phase of the energy-saving transformation project of the No. 5 Heavy Steel Plant of Chongqing Iron and Steel Co., Ltd. needs to carry out technological transformation of the original finishing workshop. The finishing workshop is a single-story double span with a span of 27 meters. The trapezoidal steel truss (partial truss with skylights) and 3 x 6 meters of large roof panels are made from waterproof roofing. According to the process requirements, it is necessary to construct three large spans with a column spacing of 18 meters in columns of 6 meters. In view of the limitations of various conditions, the construction of a 18-meter long span project requires the use of a five-factory repair program, and the scheduled repair time is 25 days. At present, the conventional method for transforming the column spacing of heavy-duty roofs (steel roofs or large-scale roof slabs with reinforced concrete) is to change the original 6-meter column spacing to 12-meter column spacing, and pull out one column, using the top bracket to lift the column. Roofing system, keeping the original