METHOD FOR PREDICTING PULL-IN SITUATION OF CABLE IN CONDUIT

摘要

A method for predicting the pull-in situation of a cable in a conduit where pull-in tension and side pressure produced when a cable is pulled into a conduit can be predicted accurately. When the pull-in tension of a cable (10) being pulled into a conduit (30) is calculated, data on a radius of curvature acquired for every specified distance on the conduit (30) by previously measuring a radius of curvature at each part of the conduit is used, and the pull-in tension of the cable is calculated sequentially for every specified distance based on an actual radius of curvature and the known cable tension on the inlet side of a bend with a section at every specified distance on the conduit (30) assumed as a bend. Since the pull-in tension can be calculated with the impact of a bend of the conduit reflected appropriately over the entire conduit, an accurate prediction value of cable pull-in tension close to that at the time of an actual pull-in of the cable can be attained. Consequently, correct judgment can be made for cable pull-in, trouble can be prevented at the time of pulling in the cable, and processing results can be obtained quickly by simplifying calculation processing.