Influences of Damage Levels of Outer Aging Pipes on Mechanical Behavior of Rehabilitated Pipes

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  • 既設老朽管の損傷レベルが更生管力学挙動に与える影響
  • キセツ ロウキュウカン ノ ソンショウ レベル ガ コウセイカン リキガク キョドウ ニ アタエル エイキョウ

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Abstract

Recently, trenchless rehabilitation methods for aging irrigation pipes are often used. In this method, a new pipe is inserted into an aging pipe. Therefore, the rehabilitated pipeline consists of the outer aging pipe and the inner rehabilitated pipe. However, the mechanical influences of the damaged outer pipes on the inner rehabilitated pipes are not clear. In the present study, in order to reveal the influences, model experiments were conducted under the different damage levels of the aging pipe and loading positions. Experimental results indicate that the deflection of the rehabilitated pipe increases according to the damage level of the aging pipe. In addition, the strain concentration occurs at the top and the bottom of the rehabilitated pipe due to the point contact of the edge of the aging pipe. It is also found that the deflection and the strain distribution of the rehabilitated pipe under the eccentric load are significantly affected by the damage level of the aging pipe.

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