Development of efficient construction, maintenance and renewal methods to reduce life cycle cost of buried pipes

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Trenchless renewal method for an old existing pipe, putting inner flexible lining without ground excavation, was mainly investigated. A series of laboratory model tests was conducted to examine effects of backfill soil condition and host pipe deterioration on the behavior of flexible liner of double-layered pipe by trenchless renewal. Mechanism of the formation and expansion of underground cavity due to the soil loss from the broken part of old deteriorated buried pipe was also studied.