SHAFT BODY AND STRAIN MEASUREMENT METHOD FOR THE SAME

To provide a method for measuring strain generated in a shaft body.SOLUTION: Provided is a measurement method of strain in a shaft body comprising a shaft member and a plurality of length and identification indicators formed on the shaft member. In a pre-construction measurement step S1, a pre-construction length, which is a length in the axial direction between a first length indicator and a second length indicator of the plurality of length indicators, is measured for the shaft body, and the pre-construction length is recorded in association with the identification indicators. In a post-construction measurement step S7, after the shaft body is constructed, a post-construction length, which is a length in the axial direction between the first length indicator and the second length indicator of the shaft body, is measured. In a calculation step S9, the pre-construction length associated with the identification indicator of the shaft body measured in the post-construction measurement step is found among the identification indicators of the shaft body recorded in the pre-construction measurement step, and the strain ε of the axial body is obtained by the equation (1): ε=(L-L)/L...(1) where L(m) is the pre-construction length and L(m) is the post-construction length.SELECTED DRAWING: Figure 3 【課題】軸状体に生じたひずみを測定する軸状体のひずみ測定方法を提供する。【解決手段】軸状部材と、軸状部材に形成された複数の長さ指標及び識別指標と、を備える軸状体のひずみ測定方法であって、軸状体において、複数の長さ指標のうちの第１長さ指標と第２長さ指標との軸方向の長さである施工前長さを測定し、施工前長さを識別指標と関連付けて記録する施工前測定工程Ｓ１と、軸状体を施工した後で、軸状体の第１長さ指標と第２長さ指標との軸方向の長さである施工後長さを測定する施工後測定工程Ｓ７と、施工前測定工程で記録された軸状体の識別指標のうち、施工後測定工程で測定された軸状体の識別指標に一致するものに関連付けられた施工前長さを求め、施工前長さをＬ１（ｍ）、施工後長さをＬ２（ｍ）としたときに、式（１）から軸状体のひずみεを求める算出工程Ｓ９と、を行う。ε＝（Ｌ２−Ｌ１）／Ｌ１・・（１）【選択図】図３