Research Towards a Long-Term Restoration Plan for Sewage Pipe

Since the continuing rapid deterioration of sewage pipes in each city in Japan is now a real concern for the future, the implementation of a restoration and renewal project has become a pressing requirement. Towards that end, a long-term restoration plan must be formulated which is efficient and also takes into account the cost and risks involved.In this research, in addition to video camera surveys, an impact elastic-wave inspection method survey was implemented to compute a prediction formula for the soundness rate with an improved accuracy.As a result, it was possible to set a target durable life of 66 years exceeding the Japanese standard service life of 50 years. From this, we were able to formulate a long-term restoration and renewal plan by setting a target durable life.