Title:
REINFORCING CORE MATERIAL FOR SMALL-DIAMETER CAST-IN-PLACE PILE, AND FORMING METHOD OF ROLLING SCREW
Document Type and Number:
Japanese Patent JP2023082384
Kind Code:
A
Abstract:
To provide a joint structure of a reinforcing core material for a small-diameter cast-in-place pile and a forming method of a rolling screw which enables screw processing to a base material of a reinforcing core material which is thin and has a low roundness.SOLUTION: In a reinforcing core material 30 for a small-diameter cast-in-place pile made of a steel pipe in which a plurality of depressions 32 is formed in a pipe circumferential direction and a pipe axial direction on an outer peripheral surface of a pipe body 31, the pipe body 31 has a rolling screw portion 33 on the outer peripheral surface of both ends of a steel pipe with a recessed portion having a diameter of 48.6 mm and a thickness of 6 mm. Shapes of a peak portion 34 and a valley portion 35 of the rolling screw portion 33 have a combination different from each other. A curvature of an inwardly curved flank surface 34a of the peak portion 34 and a curvature of an inwardly recessed curved surface 35a of the valley portion 35 are different from each other, and a curvature of one of the peak portion 34 and the valley portion 35 is set to 1 mm, and a curvature of the other of the peak portion 34 and the valley portion 35 is set to 2 mm.SELECTED DRAWING: Figure 3
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Inventors:
HIKITA NOBUHARU
Application Number:
JP2021196118A
Publication Date:
June 14, 2023
Filing Date:
December 02, 2021
Export Citation:
Assignee:
HIROSE HOKYOSHI CO LTD
International Classes:
E02D5/54
Attorney, Agent or Firm:
Sakuo Yamaguchi
Nobuyuki Ohshima
Shinjiro Yamaguchi
Tadahiro Matsumoto
Nobuyuki Ohshima
Shinjiro Yamaguchi
Tadahiro Matsumoto