| 摘要 |
PROBLEM TO BE SOLVED: To provide a net body for a civil engineering work reinforcing a banking or the like while being able to predict the danger of the collapse of the banking or the like. SOLUTION: In the net body N in which the warps 1 and the weft 2 made of a synthetic resin are crossed alternately and each intersection section is fixed, the net body N for civil engineering works are constituted by installing an optical fiber sensor 5 to at least one warp 1a. Pulse light is projected to the optical fiber sensor 5 for the net body N for engineering works buried into the banking or the like for reinforcement, the back scattered light of brilliant scattered light is detected, and the danger of the collapse of the banking or the like can be predicted when the distortion distribution and distortion quantity of the sensor 5 are measured from the frequency shift distribution.
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