US Patent 7431383 Construction machine and method for manufacturing the same

A construction machine includes a lower traveling body on which an upper rotating body is rotatably disposed. The rotating body includes an upper frame provided with a bottom plate and a supporter acting as a perpendicular member. The bottom plate has an attachment hole extending substantially perpendicular to the bottom plate. The supporter is welded substantially perpendicular to the bottom plate while one end of the supporter is engaged with the attachment hole. Accordingly, the supporter can be easily fixed to the bottom plate while maintaining the perpendicularity and a proper height setting of the supporter.