Fremgangsmåte og innretning for innföring av en stiv understöttelse i en hylse for skjöting av elektriske kabler

摘要

An apparatus comprising two half-shells (7a, 7b) that can mutually be approached to enclose a sleeve (6) among a plurality of pressure elements (11) homogeneously distributed with respect to the outer surface of the sleeve (6) itself and elastically connected to the fixed parts of the half-shells (7a, 7b). The apparatus allows to carry out a process according to which the sleeve (6) enclosed between the half-shells (7a, 7b) is subject to radial centripetal forces homogeneously distributed on its outer surface before a rigid support (3) is inserted in said sleeve. During the insertion of the support (3), the centripetal forces are progressively increased in the zones wherein the end of the support gradually lies. Moreover opposite forces distributed along the whole length of the sleeve (6) and directed in direction opposite to the force producing the advancing of the support are applied on the outer surface of the sleeve. The combined action of the centripetal and opposite forces impedes longitudinal shrinkages of the sleeve and prevents bendings due to the buckling loads.