如果还留有某些间隙，就稍微拧松调整螺母(对于起重臂缩回)。

If there's still some clearance, slightly loosen the adjusting nut (for retraction of the boom).

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通过试验和理论分析厚、扁螺母在紧固过程中的受力情况，并从试验结果得到一个较合理的厚螺母拧紧力矩，既能保证塔式起重机的安全运行，又能延长螺栓的使用寿命。

Changing the positions of thin and thick nuts and using the right thick nut tightening torque ensure safe operation of the crane and longer lives of the screws.

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