JP-7856525-B2 - structure pillar

Inventors

• 岡本 貴行
• 西川 裕
• 浦野 真次
• 西田 浩和

Assignees

• 清水建設株式会社

Dates

Publication Date

20260511

Application Date

20220822

Claims (4)

1. A cylindrical part, A structural column comprising: a stepped portion provided on one side of the axial direction of the cylindrical portion, and formed in a stepped manner so as to gradually taper toward the one side in the axial direction.
2. The aforementioned stepped section is formed of precast concrete, as described in claim 1.
3. The bottom portion provided at one end of the cylindrical portion in the axial direction, A structural column according to claim 1 or 2, comprising a connecting portion in which grout material is filled between the stepped portion and the bottom portion.
4. A first joining plate portion is provided on the outer surface of the cylindrical portion. A second joining plate portion is provided on the outer surface of the aforementioned stepped portion. The structural column according to claim 1 or 2, wherein the first joining plate portion and the second joining plate portion are bolted together via a splice plate.

Description

This invention relates to a structural column. Conventionally, in the construction of structural columns as shown in Patent Document 1 below, flow concrete has been used to improve the concrete filling rate at the bottom when pouring pile concrete after steel pipe erection. There is a need to manage the concrete filling rate without relying on visual inspection. Japanese Patent Publication No. 2002-54164 This is a front view showing the lower part of a structural column in one embodiment of the present invention.This is a bottom view showing the lower part of a structural column in one embodiment of the present invention.This diagram illustrates a construction method for a structural column according to one embodiment of the present invention.This diagram illustrates the effects of a structural column in one embodiment of the present invention. A structural column relating to one embodiment of the present invention will be explained using drawings. The structural column according to this embodiment is used, for example, in the top-down construction method. The top-down construction method is a construction method in which the underground and above-ground floors are constructed simultaneously. Figure 1 is a front view showing the lower part of a structural column according to one embodiment of the present invention. As shown in Figure 1, the lower part of the structural column 1 is positioned within the pile hole 11 (see Figure 4). The structural column 1 comprises a steel pipe 2, a stepped member (stepped section) 3, and a connecting section 4. In the following description, the axial direction of the steel pipe section (cylindrical section) 21 of the steel pipe 2 (indicated by the dashed line O in the figure) is oriented vertically, and the bottom plate section 22 is positioned below the steel pipe section 21. The steel pipe 2 has a steel pipe section 21 and a bottom plate section (bottom) 22. The steel pipe section 21 is formed in a rectangular tubular shape. With the lower part of the structural column 1 installed in the pile hole 11, the axial direction of the steel pipe section 21 is oriented vertically. The shape of the steel pipe section 21 may also be cylindrical. Each of the four outer surfaces 21a of the steel pipe section 21 is provided with erection pieces (first joining plate sections) 24 that protrude laterally. The erection pieces 24 project in a direction perpendicular to each outer surface 21a. The erection pieces 24 are joined to the outer surfaces 21a of the steel pipe section 21 by welding or other means. Note that the outer surfaces 21a of the steel pipe section 21 are the surfaces facing outwards, opposite to the interior of the steel pipe section 21. The base plate portion 22 is provided at the lower end (one end in the axial direction) of the steel pipe portion 21. The base plate portion 22 has a rectangular shape in plan view. The edge portion 22a of the base plate portion 22 protrudes outward from the steel pipe portion 21. The stepped member 3 is positioned below the bottom plate portion 22 of the steel pipe 2, with a gap S between them. The stepped member 3 is made of precast concrete. The lower surface of the stepped member 3 is formed in a stepped shape, gradually tapering downwards. In this embodiment, the stepped member 3 has four steps 31 to 34. The number of steps in the stepped member 3 can be set as appropriate. Figure 2 is a bottom view showing the lower part of the structural column 1. The stepped sections 31 to 34 are arranged in the order from top to bottom. The stepped sections 31 to 34 are arranged coaxially with the steel pipe section 21. The stepped sections 31 to 34 are roughly rectangular parallelepipeds. As shown in Figure 2, when viewed from below, the bottom area of the stepped section 32 is smaller than the bottom area of the stepped section 31. The bottom area of the stepped section 33 is smaller than the bottom area of the stepped section 32. The bottom area of the stepped section 34 is smaller than the bottom area of the stepped section 33. The lower surfaces 31d of step portion 31, 32d of step portion 32, 33d of step portion 33, and 34d of step portion 34 are slightly inclined relative to the horizontal plane. The angle of inclination of the lower surfaces 31d of step portion 31, 32d of step portion 32, 33d of step portion 33, and 34d of step portion 34 with respect to the horizontal plane is approximately 3° or less. However, the lower surfaces 31d of step portion 31, 32d of step portion 32, 33d of step portion 33, and 34d of step portion 34 may also be aligned with the horizontal plane. Each of the four outer surfaces 31a of the stepped portion 31 is provided with a connecting fitting 36. The connecting fitting 36 has a fixed plate portion 36a and an extended plate portion (second connecting plate portion) 36b. Note that the outer surface 31a of the stepped portion 31 is the surface facing outwards, opposite to the interior of the stepped portion 31. Th