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Prefabricated pile, to be driven into the ground, has a reinforced foot end with a weaker section which bursts and expands through the pile-driving forces?keyword=Prefabricated pile, to be driven into the ground, has a reinforced foot end with a weaker section which bursts and expands through the pile-driving forces?keyword=Prefabricated pile, to be driven into the ground, has a reinforced foot end with a weaker section which bursts and expands through the pile-driving forces?keyword=Prefabricated pile, to be driven into the ground, has a reinforced foot end with a weaker section which bursts and expands through the pile-driving forces 专利,更快更准确