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Based on the job site condition of shaft lining sinking by means of floatation, model experiment equipments of drilling shaft lining and experimental process were designed, then the sinking by means of floatation experiment was finished. The results show that the deflection cure of cylinder shaft lining is roughly sine cure when uplouted prevention second balance weight water is filled after lowering it to bottom of a shaft hole. At the same time, the opposite force in shaft top facing bars would be increasing as the increase of shaft wall inner force. The experiment results indicate that the slipping of a shaft pan is caused by adding second weight water.
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