集装箱装卸桥（以下简称桥吊）是集装箱专用码头的主要装卸工具 ,它的好坏直接影响到集装箱码头的正常运转。当一台新桥吊投产十多年以后 ,其老化现象将十分严重 ,虽可经过多次技术改造 ,但频繁作业仍使其故障率很高且时有掉箱事故发生。本文利用ＫｅｎｎｔｈＪ.Ｇｒａｈａｍ和 Container loading and unloading bridge (hereinafter referred to as bridge crane) is the main container loading and unloading special wharf, its quality has a direct impact on the normal operation of the container terminal. When a Xinqiao crane put into operation more than 10 years later, the aging phenomenon will be very serious, though after many technological transformations, but still make it a high rate of failure is high and sometimes a drop box accident. This article uses Kennth J. Graham and