随着我国对南海开发的不断深入，大型海工结构对深水安装能力提出了更高的要求。世界范围内配备超过400 t深水吊机的水下工程船资源非常有限且租金昂贵，如何更好地发挥现有资源的能力，使其满足深水大型结构物的安装需求成为迫在眉睫需要解决的问题。传统吊装曲线法认为最大动态吊装荷载需要小于安全工作荷载，这极大地限制了吊机能力的发挥。本研究从吊装曲线设计方法入手，明确吊机实际吊装能力，通过精确把握驳船、工程船与吊机的相对运动，驳船起吊时也可采用船内吊装曲线，可提高近30%的吊装能力。基于上述理论计算吊装荷载，并结合吊机预、报警状态定义三个UC值对吊机能力进行评估，本研究形成了一套成熟的算法，且已在实际工程中得到验证。为更好地实现理论算法向工程实践的转化，本研究进一步开发了一套高效的吊装能力评估软件，对深水大型结构物安装能力评估有重要的指导意义。

With the continuous advancement of offshore development in the South China Sea， the installation of large-scale marine structures poses increasingly higher demands on deep-water capabilities. Globally， the fleet of subsea construction vessels equipped with cranes exceeding 400 tons is extremely limited， and their charter rates are extremely high. Therefore， maximizing the utilization of existing resources to meet the installation needs of large deep-water structures has become an urgent issue that requires immediate resolution. The conventional lifting curve method， which requires the maximum dynamic load to remain below the safe working load， significantly underutilizes the crane’s capacity. This study begins with the design method of lifting curves to clarify the crane’s actual lifting capacity. By precisely capturing the relative motion among the barge， construction vessel， and crane， the inboard lifting curve can be applied during barge lifting operations， increasing the lifting capacity by nearly 30%. Based on this theoretical framework， we calculate the lifting load. Subsequently， by integrating the crane’s pre-alarm and alarm states to define three unity check （UC） values， a comprehensive assessment of the crane’s capacity is conducted. This study establishes a mature algorithm that has been validated in actual engineering projects. To better translate the theoretical algorithm into engineering practice， this study further develops an efficient software tool for lifting capacity assessment， which provides significant guidance for assessing the installation feasibility of large deep-water structures.