| 摘要 |
A method for installing a tubular cable-duct around a cable buried in the ground includes steps of freeing a portion of the buried cable from the ground in a forward longitudinal direction of the cable, starting from a free end of the buried cable, and advancing a foremost end of the cable-duct and subsequent portions of the cable-duct in the forward longitudinal direction of the cable over the portion of the cable freed from ground, starting from the free end of the cable. The advancing step includes the sub-steps of exerting pulling forces on the cable with a pulling device engaging the free end of the buried cable in a direction which is substantially opposed to the forward longitudinal direction of the cable, and exerting pushing forces with a pushing device engaging the cable-duct in a direction which is substantially opposed to the direction in which the pulling forces are exerted. An apparatus for installing the tubular cable-duct around a cable buried in the ground includes a winch provided with a winching wire having a coupling unit for providing a tension-proof coupling to a free end of the buried cable, a clamp which clamps an end of the cable-duct, a feed-unit which is coupleable to the end of the cable-duct for feeding a fluid to the cable-duct, and a displaceable support on which the winch, the clamp and the feed-unit are arranged in a mutually fixed position with respect to one another.
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