FIELD: construction; replacement of underground pipelines of different application.
SUBSTANCE: according to proposed method, new pipeline is pulled in place of cold pipeline to be replaced through flexible corrugated heat-insulated hose. Hot air is delivered between heat-insulated hose and new pipeline to heat it to temperature not higher than temperature of beginning of plastic deformation of material of new pipeline. If frozen earth is found around old pipeline, heated air is delivered into old pipeline to defrost earth completely.
EFFECT: improved efficiency of pipe laying.
1 dwg
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