| 摘要 |
PROBLEM TO BE SOLVED: To provide a tunnel reinforcing material separation detecting method and a device for accurately measuring separation of a reinforcing material in a reinforcing place in a tunnel at a remote point. SOLUTION: When reinforcing an inner wall surface of a tunnel lining 3 by a reinforcing material 31, after confirming a position of a crack 4, an optical fiber 2 is arranged in the direction orthogonal to the crack 4 on a surface of the reinforcing material 31 after finishing reinforcement, and two points are adhered and fixed by a fixing member 5. A strain measuring instrument 6 for measuring strain of the optical fiber 2 in a separation monitoring position and an arithmetic processing unit 7 are connected to a starting end part of the optical fiber 2. The strain measuring instrument 6 inputs the strain to the arithmetic processing unit 7 by measuring the strain of the optical fiber 2 in the separation monitoring position. The arithmetic processing unit 7 stores the strain measured by the strain measuring instrument 6, and compares strain measured last time with strain measured this time always or with every specific time, and detects separation of the reinforcing material 31 by detecting a state of changing to compression strain from tensile strain. COPYRIGHT: (C)2004,JPO&NCIPI
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