報告書番号

U03032

タイトル（和文）

信頼性重視保全（RCM）を用いた保全合理化支援システムの検討 --ダム洪水吐ゲートへの適用--

タイトル（英文）

Study on a maintenance management system based on Reliability Centered Maintenance (RCM)-Application to a spillway radial gate-

概要 （図表や脚注は「報告書全文」に掲載しております）

本論は，主に水力土木構造物を対象とする保全方式を合理化するために，信頼性重視保全（RCM）を応用した保全合理化支援システムを構築することを目的とする．RCMは，実践的なメンテナンス戦略のフレームワークを提供する近年特に注目されている手法である．提案システムは，RCMの考え方を取り入れた定性分析と，保全作業の履歴データを用いた定量分析とを組み合わせ，実践的に保全方式の合理化を支援することを可能とする．本手法を実際の洪水吐きラジアルゲートに適用し，事例検討を行った．ラジアルゲートは，３３のサブシステムにブロック化され，サブシステムごとに1957年から1997年までの補修・更新・塗装履歴データベースを構築した．これらのデータベースに基づく定性および定量的な分析作業により，合理的な点検周期などを明らかにした．最終的に，経営的な判断から設定された削減目標を満たすように適切な合理化案が決定される．

概要 （英文）

This paper describes a maintenance management system for hydropower civil engineering structures represented by spillway radial gates based on Reliability Centered Maintenance (RCM). RCM provides a framework for the practical maintenance strategy, which includes a qualitative systematic analysis. The proposed system is divided into two analysis parts: i.e., qualitative and quantitative. In the qualitative analysis, the failure modes of the target system are identified and their maintenance priorities are determined on the basis of the RCM framework. In order to reduce the maintenance cost effectively, the maintenance rationalization alternatives are also discussed from the following points of view: (1) Change in maintenance policy, (2) Rationalization of the inspection work, and (3) Change in repair, renewal and painting criteria.On the other hand, the quantitative analysis is performed in order to evaluate the reliability and cost effectiveness of the maintenance rationalization alternatives determined by the qualitative analysis. Its basic framework is defined by Equation ①. E(Ctotal(P,R,D)) ⇒min ① s.t E(A)≧Aaccpt，E(MCtotal)≧MCtarget E(Ctotal(P,R,D)) indicates a cost function. E(Ctotal(P,R,D)) has the following parameters: maintenance policy (P), inspection work（R），repair, renewal and reprinting criteria (D). E(A) indicates the expected availability defined as the probability of the normal condition. A accept indicates the acceptable availability level. E(MCtotal) indicates the expected maintenance cost．MCtarget is the target maintenance cost. Equation ① shows the basic formulation to minimize the total cost with the above maintenance conditions when availability(reliability) and budgetary restrictions are required. In Japan, since hydropower facilities are maintained by the preventive maintenance policy, the failure records are very low. Therefore, this paper presents a methodology, which evaluates E(Ctotal(P,R,D)) using past records of repair, renewal and repainting rates instead of failure rates. The proposed system is applied to an existing spillway radial gate. The spillway radial gate is divided into 4 systems and 33 subsystems for the analysis. The records of repair, renewal and repainting from 1957 to 1997 for every subsystem are collected and its database is constructed. As an example, the optimum inspection interval is qualitatively and quantitatively discussed on the basis of the developed database. As a result, reasonable maintenance tasks including an appropriate inspection interval are determined.

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