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The pre-bored precast concrete pile construction method is to use pre-bored pre-cast piling equipment for drilling, deep stirring and expanding the bottom, and finally implanting the pre-cast pile body. ?? ?????? ???????? ???? ?? ??? ??????? ?????? ???? ??????? ??? ?????? ???? ???????? ???????? (PHDC) ?? ??????? ???????? ??????? ?????? (PHC) ?? ????? ?????? ???? ????? ??????? ?? (PHC) ??????? ?????? ??

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