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                                            一般文献所给出的四点吊桩的吊点布设是以吊索等长为前提的。实际工程中各吊索间长度总是存在偏差 ,因此会给吊索的吊力和桩身弯矩带来不容忽视的影响。本文通过具体工程实例做了初步研究 ,得出一些初步的结论性意见
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                                            The arrangement of four lift points to hoisting a pile,as given in general technical literature,is on the premise of slings with equal length.However,erroneous length of the slings is always found in practical works,causing non-ignorable effect on the lift force of the slings and the bending moment of the piles.preliminary research has been made in practical works and some tentative conclusive comments are proposed.
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