PROBLEM TO BE SOLVED: To provide a construction method for improving the yield of truss bar by a simpler means.;SOLUTION: There are two possible reasons for the deformation of the bottom muscle contained in the truss bar: 1) deformation of the bottom bar due to stress due to deformation of the lattice bar, and 2) deformation of the bottom bar itself. For the former, it is conceivable to cut the welding point of the bottom and lattice bars in the vicinity of the portion where deformation is occurring or to cut the lattice bar near the welding point where deformation is occurring. For the latter, the bottom muscle is corrected by cutting a portion with a large amount of deformation of the bottom bar.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2019,JPO&INPIT
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