Analysis of the long-term effects of maintenance strategies
نویسندگان
چکیده
Abstract Operation, maintenance and rehabilitation of sewer networks are mainly driven by the results of CCTV inspections. With the European EN 13508 code, a standard classification scheme has been issued. The inspection results of course are suitable for prioritizing the most urgent measures within the network, because of leaks exfiltrating fowl water to the aquifer or collapses causing instability, which are detected in a pipe. However, pro-active rehabilitation of the network aims at forecasting the condition of a pipe, in order to rehabilitate it before serious failures occur as in general, infrastructure networks that are bound to lines are subject to a more or less continuous aging process. Here the aging scheme can vary in dependence on line-specific characteristics or/and their combination. This particularly applies for drain and sewer systems that have historically grown and are therefore very heterogeneous regarding their age, their constructional actual condition or the pipe material of the single sections, for example. A rehabilitation planning in which this situation and the future development of the network is not realistically included must inevitably lead to a miscalculation of the need for rehabilitation and investment. In order to ensure a long-term planning security it is indispensable to extensively analyze the characteristics of the local network aging and to include them in the strategy design.
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