유연입상설치시스템에서 해저케이블 hang-off clamp의 구조적 안전성 연구

Abstract

This study analyzes the restraining force of the hang-off clamp and the safety of the wire during submarine cable installation using the Flexible Pull-in Installation System (FPIS). In particular, for permanent clamps, it is crucial to examine the potential for slip and failure due to self-weight before and during installation, as well as additional loads after fastening. To achieve this, numerical analysis was conducted to evaluate the maximum frictional resistance of the clamp and the possibility of wire damage. The analysis results indicate that the minimum frictional load generated in the temporary clamp is approximately 34.63 kN, which is about 14% higher than the target weight of 30 kN for the cable and protective equipment. Additionally, when the permanent clamp is fastened, the maximum stress observed in the clamp is 414.4 MPa, while the maximum stress in the wire reaches 881.3 MPa. Although the wire's maximum stress exceeded the material's tensile strength, this was attributed to localized stress concentration. Buckling and deformation were observed; however, the possibility of complete failure was determined to be low.