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通过对起重机工作特点及场所的说明,找出主梁下挠的原因及主梁下挠对起重机的危害,提出体外预应力张拉修复技术的原理及修复方案,解决了主梁下挠的问题。
Through the characteristics and place of the crane work to find out the reasons for the main girder under the deflection and the main girder under the crane on the harm of harm, put forward the principle of prestressed external tension and repair of the repair program to solve the problem of the main girder under the deflection .