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 .
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.
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.
现场载荷试验及反射波法低应变动力检测试验表明，CFG桩桩身完整性很好，复合地基的承载力提高显著，证明该工程的CFG桩复合地基设计及施工是成功的。
The results of plate loading test and low strain dynamic testing show that the quality of CFG pile composite foundation is good and subgrade bearing capacity has been improved successfully.
现场载荷试验及反射波法低应变动力检测试验表明，CFG桩桩身完整性很好，复合地基的承载力提高显著，证明该工程的CFG桩复合地基设计及施工是成功的。
The results of plate loading test and low strain dynamic testing show that the quality of CFG pile composite foundation is good and subgrade bearing capacity has been improved successfully.
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