Bored cast-in-place pile is very important as the foundation of structure. Recently researches that aim to widen its diameter, to lengthen, to multiply its kinds and to extend its purpose of usage are put into practice according to the restrictions of construction site and the enlarging of structures, then, there arose some new problems adding to usual ones. First, as the problem of design, the vertical and lateral bearing capacity, the bearing capacity of different type piles, the deformation capability of piles and the fixed end condition of pile head are mentioned. As the problem of pile body, the proportioning of concrete, the increasing of concrete strength and the heat caused by cement hydration are referred. As the problem of installation, the way of construction management, labor saving and the consideration for environment are counted. In this report, problems mentioned above are taken up and they are explained respectively.
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