To provide the female forma goby

摘要

PROBLEM TO BE SOLVED: To newly provide a reinforced seam structure of a knockdown duct for preventing a hanging bend of a female seam, and for increasing efficiency in knockdown and suspending work.;SOLUTION: This reinforced seam structure of the knockdown duct is characterized in that a recessed inclined belt-like reinforcing surface is arranged in the upper and lower part lengthwise direction of duct assembling left and right side plates, the female seam is arranged in the shape of embedding a recessed inclination outside upper and lower end parts continuing with the belt-like reinforcing surface, a male seam fitted in and fixed to the female seam is arranged on duct assembling upper and lower plates, and clearance is arranged between the left and right side plates and the respective female seams for fitting a support plate or a support roller and the lower end of a suspending metal fitting for a duct pipe for supporting the duct from below at duct assembling time.;COPYRIGHT: (C)2003,JPO