This paper introduces the large-area cracking of steel structure of large and middle balance beams of the ship unloader,establishes the track and management measures before crack repair,analyzes causes and prepares the crack repair plan to design and calculate the jacking before crack repair of balance beam and reinforcement scheme after repair.%介绍了卸船机大平衡梁和中平衡梁钢结构大面积开裂的情况，制定了裂纹修复前的跟踪管理措施，分析了开裂成因并制定了裂纹修复方案，对平衡梁裂纹修复前的顶升和修复后的加固方案进行设计和计算。
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