PROBLEM TO BE SOLVED: To provide a bent pipe stress evaluation method and a bent pipe stress evaluation device capable of evaluating axial and circumferential stress generated in the bent pipe precisely from the amount of sectional flatness in a straight pipe connected to the bent pipe even if it is not possible to directly measure the bent pipe section since other buried objects, or the like approach.;SOLUTION: A control section 7 sets appropriate amount-of-flatness measurement section 41 according to pipelines to an exposed straight pipe 35a, based on previously input pipeline information. The amount-of-flatness measurement section 41 is set at a position separated by measurement distance 47 that is 0.5 to 1.5 times larger than a pipe diameter 45 in the direction of the straight pipe 35a from a pipe connection section 43, namely a connection section of a bent pipe 37 and the straight pipe 35a. Then, the amount of flatness in the straight pipe is calculated from the amount of flatness in the straight pipe 35a at the amount-of-flatness measurement section 41. Then, the amount of flatness in the bent pipe is calculated from a flatness ratio at the position of the amount-of-flatness measurement section 41 and the measured amount of flatness in the straight pipe, thus calculating axial and circumferential stress generated in the bent pipe.;COPYRIGHT: (C)2010,JPO&INPIT
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