加油站双层储油罐底板施工变形控制方法研究

Research on the Deformation Control Method of the Bottom Plate Construction of the Double-layer Oil Tank of Gas Station

针对储油罐底板施工材料布局、焊接接头形式复杂,对施工质量、施工时间产生影响,提出施工变形控制研究。在双层储油罐底板焊接施工前底板预制阶段,根据罐底板材料规格,采用丁字型排版法合理排版布局施工材料尺寸;在底板焊接施工过程中,依据底板结构以及底板面积大、焊接接头形式复杂、焊缝数量多等施工变形原因,选择以CO_(2)气体保护焊打底,埋弧碎丝焊填充盖面的焊接方法,依据罐底板焊接施工原则,遵循短、中长、长焊缝的顺序依次焊接,边缘板的对接接头组对,采用不等间隙方法,有效控制底板中幅板的焊接、底板边缘板的组对及焊接、与筒体的组对及焊接、大角缝焊接等过程,实现双层储油罐底板施工变形控制。结果表明:储罐的底板整体变形值成功控制在11 mm以内,提高施工质量的同时,节省时间和经济成本。

This paper proposes the construction deformation control study for the influence of the construction material layout and construction joint form of the construction quality and construction time.In the prefabrication stage of bottom plate before welding of double oil storage tank bottom plate,the construction material size shall be reasonably distributed according to the type of tank bottom plate material specifications.In the construction process of the bottom plate welding,according to the bottom plate structure,the large bottom plate area,the complex form of welding joints,and the large number of welding joints.Select the welding method of protecting welding bottom with CO_(2) gas and buried arc broken wire welding,according to the construction principle of tank bottom plate welding,and follow the order of short,medium-long and long welds.The docking joint group of the edge plate adopts unequal gap method to effectively control the welding of the bottom plate,the bottom plate edge plate group pairing and welding,cylinder group pairing and welding,large angle joint welding,so as to realize the construction deformation control of the bottom plate of the double-layer oil storage tank is realized.The results show that the overall deformation value of the bottom plate of the tank is successfully controlled within 11 mm to save time and economic cost while improving construction quality.