In this study, the authors focus on sheet-pile structures in port facilities, and propose maintenance/rehabilitation policies of sheet piles and a methodology for determining the priority of maintenance/rehabilitation of them, in order to reduce expected lifecycle costs under budgetary restrictions. In detail, the authors formulate a mechanical model for evaluating the structural stability of sheet-pile against seismic force and propose a hybrid simulation model for determining the priority of sheet pile maintenance/rehabilitation based on the evaluation results of structural stability and designing desirable maintenance/repair policies and prioritizing rules so as to reduce estimated lifecycle costs considering seismic risk as much as possible under budgetary restrictions. In addition, the effectiveness of the proposed methodology is discussed through an case study targeting actual sheet piles in a port facility
Sewage works facilities consist of various assets groups. And there are many kinds of financial resources. In order to optimize the maintenance plan, and to secure the stability and sustainability of sewage works management, it is necessary to carry out financial simulation based on the life-cycle cost analysis. Furthermore, it is important to develop management accounting system that is interlinked with the financial accounting system, because many sewage administration bodies have their financial accounting systems as public enterprises. In this paper, a management accounting system, which is designed to provide basic information for asset management of sewage works facilities, is presented. Also the applicability of the management accounting system presented in this paper is examined through financial simulations.
This paper highlights the issues of procurement management in construction projects, such as late delivery of purchased equipments/materials and missing instructions from customers, which cause delays of construction schedule and over-budget cost. We point that most of these problems are caused by lack of synchronization between procurement activities and process control. Therefore, we propose a managerial method which enables better synchronization between the two by applying this method to a construction company. We discuss the necessary conditions and validity of incorporating it and show the way how to establish the mechanics through the case study. Furthermore, we analyze that the feature of this method is not only addressing procurement issues but also bringing additional benefits, such as shortening project lead time and reducing project cost.
Japan Railway has opened in Oc tober 1872 between Shinbashi and Yokohama. Since then, the contract system has been adopted in order to bui ld up the railway network concurrently. Construction contracts and cost estimates in Japan has been unquestionably developed as the top runner in the railway construction. Therefore, this paper tried to el ucidate the historical changes and cost estimates of the railway construction. In conclusion, this paper enabled us to reveal the fact that is divided into three developmental stages. a)"Early period" has not been formalized of the c onstruction contracts and construction specifications. b)"Growth period" is a unified and standardized st age of the construction contracts and construction specifications. c)"Maturation period" is an established stage that th e combination estimated cons truction cost price, the method of construction cost estimates a nd the productivity per unit of work.
This paper focuses on quantification methodologies for the size of impacts and effective utilization of the analyzed results, regarding with the social impacts of waterpower plants induced by natural disasters and facility accidents. Firstly, potential disaster scenarios which may cause the social impacts are analyzed through the survey on the past disaster records of waterpower plants. Then, the quantification methodologies are introduced for estimating casualities and regional ecomoic losses brought by the overflow water from the damaged facilities, which is identified to be the most anticipated scenario to be avoided. Thorough the application of one of the methodologies to the hypothetical headrace accident scenario, priority of maintenance strategies is examined from the viewpoints of economic losses and power generation benefits.