FIELD: manufacturing technology.
SUBSTANCE: invention relates to shell for protection of encased pipes from external action, which is made in form of pipe by spiral coiling of steel tape. Rolling lock connecting longitudinal sides of adjacent coils of wound steel tape is made with compensation gaps between edges of steel tape and inner surface of bending of rolling lock.
EFFECT: invention eliminates the possibility of rupturing of a rolling-in lock connecting coils of a spiral sheath.
6 cl, 3 dwg
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