| 摘要 |
PROBLEM TO BE SOLVED: To provide a prefabricated concrete pile capable of maintaining high flexural proof stress of of an SC pile and high vertical bearing capacity by a lower inclined plane attached projection with the so-called SC pile (steel pipe coating concrete pile), contemplating an effective propagation of shear force toward the supporting ground by placing the projection in an enlarged bulb section so that vertical load and pull-out force can be further improved and easily forming the projection in an optional position of the outside of a steel pipe so that the projection can be formed in an appropriate position and the size in accordance with a ground characteristic, building required proof stress, required bearing capacity and shape, etc. of the enlarged bulb section. SOLUTION: A projection forming member 10 of a steel material is welded and fixed to the lower end section of the steel pipe 5, and a closed space 41 is formed of the outside 6 of the steel pipe 5. The projection forming member 10 has a sideways trapezoid cross section forming up and down inclined planes 12 and 13 in both up and down sides of a vertical section 11 (b). The steel pipe 5 is installed in a centrifugal molding machine for a pile forming, and the prefabricated concrete pile 15 having the structure coating the steel pipe (an outside diameter D<SB>1</SB>and thickness t<SB>0</SB>) 5 is constituted on the circumference of a concrete body section (an inside diameter D<SB>2</SB>) 1 with manufacturing procedures of the usual SC pile (a). COPYRIGHT: (C)2006,JPO&NCIPI
|
