管種及び管齢によるスクリーニング手法の提案

摘要

Sewer material and covering thickness have been pointed out to become the causes of cave-ins occurred on roads. This study statistically analyzes the large scale sewer deterioration database of 105187 spans and 2540 kilometers collected by NILIM, MLIT, Government of Japan. As the result of the analysis, it is revealed that the influence of sewer material to the deterioration speed is strong. That is expected to become one of effective factors being able to screen minor more deteriorated sewers from numerous less deteriorated ones without on-site survey. On the contrary, it is revealed that the influence of covering thickness is weak. Calculating the surviving ratio from the material, the age and the target deterioration grade and utilizing the value based on the ratio as an indicator, the screening is expected to hit efficiently.%整備済みの下水道管渠は膨大な延長となっており，その効率的なアセットマネジメントが下水道事業の喫緊の課題となっている.本研究は，効率的スクリーニングのための指標候補として管種と土被りを取り上げ，国総研データを使用し，破損等劣化への影響度を統計的に解析する.その結果，管種の残存率に与える影響は顕著であるが,土被りのそれはわずかであると考えられる.そこで，管種及び管齢によるスクリーニング手法が効率的と期待されるので，これを提案する.