Method to prevent corrosion from progressing in steel pipe structures

[Problem] The purpose of the invention is to provide a method to prevent corrosion from progressing in steel towers, the method being able to efficiently process, with simple operations, the corrosion on the inner face of steel pipes constituting a steel tower. [Solution] This method to prevent corrosion from progressing in steel pipe structures is characterized in that two or more types of liquid (150) are poured, while being mixed, into a steel pipe constituting a steel pipe structure through an opening at either end of the steel pipe, and in that the steel pipe is filled with a resin molded foam (molded foam (152)) by way of the two or more liquids undergoing foaming expansion and curing. 本发明的目的在于提供种能够以简单的作业有效地对构成铁塔的钢管的内表面的腐蚀进行处理的铁塔的腐蚀发展防止方法。本发明的钢管构造物的腐蚀发展防止方法的特征在于，将两种以上的液体(150)边混合边从构成钢管构造物的钢管的两端中的任端的开口向钢管内注入，使两种以上的液体发泡膨胀以及固化，从而将树脂发泡成形体(发泡成形体(152))填充于钢管内。