| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile column which can be connected by a simple but easy method and has high strength, high endurance and high antirust effect, in constructing a structure, e.g., on a soft ground.SOLUTION: Rotation in auger drilling disturbs the ground in a cylindrical shape slightly larger than the auger diameter. When the disturbed ground is improved by grouting an improving material such as cement milk, rotation of a quadrangular steel pipe pile column 16 agitates the cement milk or the like and the ground disturbed by corners of the quadrangle, thereby forming a uniform improver. A corrosive environment is improved by the cement milk or the like being strong alkali, and thus antirust effect increases. In addition, an auger blade 12 at the tip of the pile column and the improver being the cement milk or the like are united and solidified to realize stronger subsidence prevention. Shop fabrication of a pile column in advance by filling a quadrangular steel pipe 4 with a main reinforcement 1, concrete, several filling pipes 3 and the like allows bolting connection and anchoring of an anchor bar with shrinkage-compensating mortar or the like, allowing steel pipe pile columns 16 to be connected to each other for extension.SELECTED DRAWING: Figure 9 |
