本文论述了连杆螺栓联接松动的机理，并指出横向交变动载荷是使螺纹松动的主要因素。

The mechanism of self-loosening of con-rod bolts is discussed. It was found that trans-verse cyclic load is the most important factor affecting self-loosening of connecting rod bolts .

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讨论了游梁抽油机的变动载荷对电动机的电流、输入功率、效率和功率因数的影响，给出了计算公式。

The influence of variable load on a beam pumping unit on the electric current, input power, efficiency and power factor of the electric motor is discussed, and relevant calculating formulae are given.

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为了快速可靠地获得单桩的极限承载力，普遍采用高应变动测法来代替静载荷法检测基桩承载力。

High stain dynamic testing method is adopted to obtain pile's ultimate bearing capacity quickly and accurately as a substitute for static loading testing method.

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