近年来拆除的导管架数量日益增多，导管架吊点的承载力成为决定拆除方案的重要因素之一。以一个仅在位7年、海生物附着厚度达到300mm（常规厚度的10倍）的渤海导管架为例，研究如何有效提升导管架吊点的承载能力。该导管架拆除时预估吊重是安装重量的2倍多，且吊点位处潮差带，主结构出现坑蚀，内部空间狭小不利于改造。详细论述了该导管架改造的思路和方法，在解决原结构缺陷的基础上，有效提升吊点的承载能力。为今后的拆除项目提供了设计思路。

 The number of jacket removal projects is increasing in recent years. The bearing capacity of jacket lifting point is one of the most important factors to determine the removal method. We select a seven-year in-service jacket in Bohai Bay of China as an example. The marine growth thickness of the jacket is about 300 mm， which is about 10 times of normal marine growth thickness. The removal weight of the jacket is more than twice of the install weight of the jacket， and the trunnion （the lifting point type of the jacket) has already appeared pitting corrosion because it is in the tidal zone. So the trunnion needs to be strengthened. But the modification is difficult because the internal space of the trunnion is small. The thought and method of transformation of the trunnion are discussed detailedly. The way to improve the bearing capacity， which can effectively solve the defects of the original structure， is put forward. This research provides a design train of thought for the jacket removal projects in the future.