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一、前言 1980年是日本第四次下水道建设5年计划的最后一年,目前下水道装备总人口普及率约达到30％,与欧美各国相比显著地落后。因此,必须加快下水道事业的发展,建设省确定,1981年开始的新的第5次下水道建设5年计划到1985年度末,总人口普及率达到55％以上,预算总投资为17兆4000亿日圆。可是,另一方面下水道工程中还存在着各种问题。例如,由于各种原因使地下水浸入下水道管渠问题,这些浸入水在管渠维护管理上造成许多问题,对最终处理场及中继
I. INTRODUCTION The 1980 is the last year of the fifth-year plan for the construction of the fourth sewer system in Japan. The current population penetration rate of sewer equipment is about 30%, which is significantly behind those of Europe and the United States. Therefore, it is necessary to accelerate the development of the sewer business. The construction province has determined that the new 5th sewer construction plan started in 1981 and the end of 1985 will have a total population penetration rate of more than 55% and a total budget of 17 trillion 400 billion yen. . However, on the other hand, there are various problems in the sewer project. For example, due to a variety of reasons, groundwater is leached into the sewer pipe drainage. These immersed waters cause many problems in the maintenance and management of the canal, for the final disposal site and relays.