IMPROVEMENT OF DISASTER PREDICTION SCREENING METHOD OF TELECOMMUNICATION CONDUIT FOCUSING ON MANHOLES

Abstract

 The importance of ensuring telecommunication even in the event of a large-scale earthquake that occurred in recent years has increased, and earthquake countermeasures for communication conduits have become an issue. On the other hand, damaged conduits are limited, and it is not efficient to implement measures for all. Therefore, it is necessary to identify conduits that are more likely to suffer disasters and implement countermeasure. Screening methods have been proposed to classify groups by using lengths, types, micro topography classifications and PGV, and to extract groups suspected of being vulnerable in past studies. In this paper, we focused on the types, sizes and shapes of manholes connected to both ends of a conduit, which we have not focused on, aiming at sophistication of this screening method. Based on the results of this tabulation, we will consider three points, as candidates for new features of pipeline which are easily affected by damage, those with relatively large numbers, those made of resin concrete, those with branched shapes.