연속굴착형 TBM 추진잭의 신뢰성 평가를 위한 가속수명시험

초록

In continuous excavation type TBM, thrust jacks contact with the inclined surface of helical segments, where they are subjected to lateral loads. When this condition persists, buckling and fatigue stresses accumulate in the major components, compromising the structural stability and reliability of the thrust jack. In this study, the primary failure modes of hydraulic cylinders were investigated to identify the main failure factors of the thrust jacks. Based on the target durability assurance period, the required failure-free test time was calculated, and an accelerated life testing protocol was designed. A dedicated test rig for the accelerated life test was constructed, and cyclic endurance tests were performed on refurbished thrust jacks. The results showed no signs of fracture or oil leakage, confirming that the jacks satisfied the reliability requirement corresponding to 4,500 hours of operation.

키워드