One kind of bored piles in karst area structure and construction method

The present invention relates to a karst area bored structure, characterized in that the structure includes pile, pocket grouting, prestressed anchor; the original cave at the clay tablets of stone backfill mixture; bored with Top expanding pile pile, cave location setting pouch grouting; grouting pouch body set squeezed reinforcement cage; bored holes set around the prestressed anchor, prestressed anchor through the top of the pile pile expand. The present invention not only has the speed of construction and low cost, but also by changing the mechanism of bored piles, pile increase the carrying capacity to achieve the purpose of strengthening the foundation. The present invention also discloses a construction method of the karst region Bored structure.