Karst area drilling cast-in-place pile structure and construction method
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The invention relates to a karst area drilling cast-in-place pile structure which is characterized in that a cast-in-place pile, a bag grouting body and a prestress anchor cable are included; an original karst portion is backfilled with a clay and rubble mixture; the top of the cast-in-place pile is provided with a pile top expansion pile body, and a karst position is provided with the bag grouting body; a squeezing reinforcement cage is arranged in the bag grouting body; prestress anchor cable holes are formed around the cast-in-place pile, and the top of the prestress anchor cable penetrates through the pile top expansion pile body. The karst area drilling cast-in-place pile structure has the advantages of being quick in construction speed, low in cost and the like. Besides, the bearing capacity of a single pile is enhanced by changing the action mechanism of the cast-in-place pile, and the aim of solidifying a foundation is achieved. The invention further discloses a construction method of the karst area drilling cast-in-place pile structure.