| 摘要 |
PROBLEM TO BE SOLVED: To easily measure strain of a pile after having been driven into a ground in a wide range by integrally disposing an optical fiber pulling at least one end from an upper part. SOLUTION: A cage-like reinforcing bar attaching an optical fiber 2 is set on a form for centrifugally molding a concrete pile 1, and the end of the optical fiber 2 is pulled out of the form. Next, concrete is supplied to be centrifugally molded, the concrete pile 1 is manufactured in the form of burying the optical fiber 2 in a cross section, and damage of the optical fiber 2 is prevented during transportation or in burying. Next, the strain of the optical fiber 2 is measured along an attaching position on strain measuring of the concrete pile 1 and measurement is performed over the range of the length direction of the concrete pile 1. Furthermore, precise strain measuring is performed even in the circumferential direction by spirally attaching the optical fiber 2. Thus the condition and the like of the load of the concrete pile 1 in the ground after building construction can be known.
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