Construction and installation method for large-span overweight special-shaped arch truss: Fid-Bau Portal

Construction and installation method for large-span overweight special-shaped arch truss

SU JUNCHI / ZHOU ZHONGYUAN / DAI LIJUN

The invention discloses a construction and installation method for a large-span overweight special-shaped arch truss, which comprises the following steps of: welding a special-shaped arch truss steel structure, pre-deviating the perpendicularity of steel columns in advance, hoisting the steel columns to form a frame, correcting each row of steel columns from the middle to two sides step by step by taking the middle steel column as a reference, and adjusting the perpendicularity deviation of the steel columns through gaps of high-strength bolt holes. The steel columns are gradually inclined outwards, the outward inclination value of the steel columns farther from the middle steel column is larger, deviation of the steel columns is effectively avoided in the welding sequence that the steel columns extend from the middle steel beam to the steel beams on the two sides, and when the thickness of a steel plate is 50 mm or above in the welding construction of the special-shaped arch truss steel structure, beam-column welding seams are shrunk to 1 mm, and column-column welding seams are shrunk to 2 mm. The column top perpendicularity displacement value of each section of column caused by welding is 2.5 mm, and welding deformation should be considered for edge columns except for a center column to perform pre-control on the steel column during measurement and correction.

本发明公开了一种大跨超重异形拱桁架施工安装方法，通过异形拱桁架钢结构焊接施工，将钢柱垂直度提前预偏、钢柱吊装形成框架后，每排钢柱以中间钢柱为基准，由中间开始逐步向两边校正，通过高强螺栓孔的间隙调节钢柱垂直度偏差，使钢柱逐渐向外倾斜，距中间钢柱距离越远的钢柱向外的倾斜值越大，从中部钢梁向两边钢梁延伸的焊接顺序焊接，有效避免钢柱的偏差，异形拱桁架钢结构焊接施工中钢板厚度50mm以上时，梁‑柱焊缝收缩为1mm，柱‑柱焊缝收缩为2mm，每节柱由于焊接造成的柱顶垂直度位移值为2.5mm，在测量校正时除中心柱外对边缘柱均应考虑焊接变形对钢柱进行预控。

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