PC STEEL STRANDED WIRE WITH OPTICAL FIBER, STRAIN MEASURING DEVICE, AND METHOD OF MANUFACTURING PC STEEL STRANDED WITH OPTICAL FIBER

• Main Authors: OKUBO KAZUMASA, OSHIMA KATSUTO, IMAI MICHIO, UEDA NOBORU, MATSUBARA YOSHIYUKI, NAKAGAMI SHINJI, NAKAI YOJI, NISHINO MOTOYASU, SOGABE NAOKI, YAMAMOTO TORU, YAMANOBE SHINICHI, OIKAWA MASASHI
• Format: Patent
• Language: English; Japanese
• Published: 03.03.2023
• Subjects: BUILDING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE; BUILDING MATERIALS; FIXED CONSTRUCTIONS; FORMS; HANDLING BUILDING MATERIALS ON THE SITE; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS; SCAFFOLDING; SHUTTERING; STRUCTURAL ELEMENTS; TESTING

To provide a PC steel stranded wire with an optical fiber capable of precisely measuring strain.SOLUTION: A PC steel stranded wire with an optical fiber includes: a PC steel stranded wire made by twisting a plurality of PC steel wires; and an optical fiber. The optical fiber is fixed, with a resin, to a twist groove which is a groove between two adjacent PC steel wires arranged on the outer surface side of the PC steel stranded wire. A variation coefficient of the distance between a common tangent line of the two adjacent PC steel wires constituting the twist groove and the center of the optical fiber, which is measured in ten cross sections perpendicular to a longitudinal direction of the PC steel stranded wire, is equal to or less than 0.5.SELECTED DRAWING: Figure 2 【課題】ひずみの精密測定が可能な光ファイバー付きＰＣ鋼撚り線を提供する。【解決手段】複数本のＰＣ鋼線が撚り合わされたＰＣ鋼撚り線と、光ファイバーと、を有し、前記ＰＣ鋼撚り線の外表面側に配置された隣接する２本の前記ＰＣ鋼線の間の溝である撚り溝に、前記光ファイバーは樹脂により固定されており、前記ＰＣ鋼撚り線の長手方向と垂直な１０個の断面において測定した、前記撚り溝を構成する隣接する２本の前記ＰＣ鋼線の共通接線と、前記光ファイバーの中心との間の距離の変動係数が０．５以下である光ファイバー付きＰＣ鋼撚り線。【選択図】 図２