抄録
Recently, sewer pipelines are mostly separated into pipeline for sewerage and pipeline for storm water. Pipelines for sewerage are required to have high durability, good chemical attack resistance and high strength as well as lining economical.
The reinforced concrete pipes manufactured in Japan are mainly medium sized 250-1500mm diameter centrifugal spun pipes, known here as Hume pipe. However since concrete and steel are highly effected by chemical attack pipe corrodes easily under environment of pH 4 and lower. Such acid environment is often created by action of bacteria, etc. within the pipe.
Ore laboratory has conducted studies on lining hardened concrete, lining fresh concrete, coating a thin vinyl chloride lining and other composite pipe system for corrosion protection.
