JPH0723455Y2 - Steel pipe concrete pillar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a steel pipe concrete column in which a steel pipe is filled with concrete.

(Prior Art) A conventional rectangular steel pipe column is a rectangular steel pipe (a) as shown in FIG.
Concrete (b) is filled inside, and if necessary, reinforcing bars are arranged in the concrete.

When the square steel pipe concrete column configured as above is subjected to a high axial force or a bending force together with a high axial force, the side of the square steel pipe (a) is subjected to the pressure P due to the axial force and is indicated by the dotted line in FIG. As shown in (a '), the shape is extruded to the outside, resulting in a decrease in yield strength.

In order to improve this phenomenon as much as possible, ribs (c) are conventionally provided in the rectangular steel pipe (a) as shown in FIGS. 8 to 15.
Or installing attachment plates (d) inside and outside each side, or embedding ring reinforcement (e) in concrete (b),
The steel pipe itself is composed of a thick steel pipe (a ″), studs (f) are erected inside each side of the steel pipe (a), or the opposite sides are tightly connected with tie rods (g). Various measures were taken.

(Problems to be solved by the invention) In the conventional steel pipe concrete column, a structure is complicated because ribs and studs are provided in the steel pipe, or opposite sides are tightened with tie rods, which requires complicated processing labor. In addition, arranging an attachment plate on each side of a square steel pipe or acting a thick steel pipe increases the weight, which is disadvantageous for handling and transportation. Furthermore, it requires a troublesome bar arrangement in the square steel pipe. There was a problem such as an increase in the cross-sectional area.

The present invention has been proposed in view of the above problems of the prior art, and an object of the present invention is to provide a structurally advantageous rectangular steel pipe concrete having a smaller cross-section and a thinner steel pipe thickness than a conventional steel pipe concrete column. The point is to provide a pillar.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a steel pipe concrete column according to the present invention has inner steel pipes arranged at upper and lower ends in a longitudinal direction of a column where an outer rectangular steel pipe column and a steel beam are joined. Installed, join the inner steel pipe to the flange of each steel beam in the pair of upper and lower beam-column joints,
The outer side of the inner steel pipe is arranged at a distance from the inner side of the outer rectangular steel pipe column, and the inner steel pipe column and the outer steel pipe are filled with concrete.

(Operation) In the steel pipe concrete column according to the present invention, the inner steel pipes are arranged at the high compression region where a large bending and axial force acts, that is, at the upper and lower ends of the column where the outer rectangular steel pipe and the steel beam are joined. By connecting the inner steel pipes to the pair of upper and lower beam flanges of the column-beam joint, the upper and lower ends of the column are double steel pipes, thus preventing the outward deformation of the square steel pipe columns and concrete. Therefore, the member yield strength is increased without causing any damage.

(Embodiment) The present invention will be described below with reference to the illustrated embodiment.

1 to 3 show an embodiment in which the present invention is applied to the joining of a steel pipe concrete column and a steel frame beam, and the upper and lower flange portions (4a) of the beam (4) made of an H-shaped steel material are preliminarily provided with inner parts. The circular steel pipe (2) or the rectangular steel pipe is welded, and then the upper and lower ends of the outer rectangular steel pipe column (1) are concentrically covered with the circular steel pipe (2) or the rectangular steel pipe. ), The upper and lower flanges (4a) are joined together, and then the outer rectangular steel pipe column (1) and the inner circular steel pipe (2) or the rectangular steel pipe are filled with concrete filling the flange of the beam (4). Concrete (3) is poured from the mouth (5). In the figure, (6) is an air vent hole provided in the flange portion of the beam (4), and (4b) is a web portion of the beam (4).

Thus, according to the above-mentioned embodiment, when a high compression force is applied to the column by a large bending and axial force, as shown in FIG.
Due to the tensile force T generated along the outer peripheral surface of the inner circular steel pipe (2), the restraining force on the concrete (3) in the outer rectangular steel pipe column (1) is increased, and in the high compression portion due to bending and axial force, etc. Deformation and damage of the rectangular steel tube column (1) are prevented, and the proof stress of the steel tube concrete column is increased.

In the embodiment shown in FIG. 5, the outer rectangular steel tube column (1)
The square steel pipe (2 ') is substantially concentric inside, and the angle between the steel pipe column (1) and the axial center is on the inner side of the outer square steel pipe column (1).
The corners of the inner rectangular steel pipe (2 ') are arranged with a space in a state of being rotated by 45 degrees, and the concrete (3) is placed in each of the outer inner rectangular steel pipe columns (1) and the rectangular steel pipe (2'). ) Is filled.

In this case, when a high compressive force acts on the steel pipe concrete column due to bending and axial force, as shown in FIG. 5, the tensile force generated along the outer peripheral surface of the inner rectangular steel pipe (2 ′) is the same as in the above embodiment. The force T increases the binding force to the concrete (3) in the rectangular steel tube column (1) and prevents the deformation of the rectangular steel tube column (1). On the inner side of the steel pipe column, the corners of the inner rectangular steel pipe are arranged at intervals with the angle between the steel pipe column and the axis rotated by 45 degrees, so that the binding force to the concrete is more effective. Act on.

(Effect of the Invention) As described above, the steel pipe concrete column according to the present invention has inner steel pipes arranged at the upper and lower ends in the longitudinal direction of the column where the outer rectangular steel pipe column and the steel frame beam are joined, and a pair of upper and lower columns is provided. The inner steel pipe is joined to the flange of each steel beam in the beam joint, and the outer side of the inner steel pipe is arranged with a space at the inner side of the outer rectangular steel pipe column, and the inner steel pipe column and the outer steel pipe are made of concrete. By filling the above structure, it is possible to prevent deformation of the upper and lower end portions of the rectangular steel tube column and the central portion of the column outside the column where high compression force is exerted due to bending and axial force, and to increase the proof stress of the member.

Therefore, the steel pipe concrete column according to the present invention is a member having a smaller cross section and higher toughness than the conventional rectangular steel pipe column, and the plate thickness of each of the inner and outer steel pipes can be made thinner, and further applicable to a super high-rise building. Is.

Further, according to the present invention, by utilizing the joint between the outer rectangular steel pipe column and the steel beam, the rectangular steel pipe or the circular steel pipe is locally arranged in the rectangular steel pipe column and the steel pipe is simply filled with concrete. Since the concrete columns are constructed, the structure is simple and the production is easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of a steel pipe concrete column according to the present invention.
FIG. 3 is an arrow view of FIG. 3, FIG. 3 is an arrow view of FIG. 1, FIGS. 4 and 5 are explanatory views of the operation of the present invention, and FIG. 6 is a cross-sectional plan view showing a conventional example. FIG. 7 is an explanatory view of its action, and FIGS. 8 to 15 are cross-sectional plan views showing examples of conventional square steel pipe concrete columns, respectively. (1) ... Outer rectangular steel tube column, (2) ... Inner circular steel tube (2 ') ... Inner rectangular steel tube, (3) ... Concrete

Claims (1)

[Scope of utility model registration request] 1. An inner steel pipe is arranged at upper and lower ends of a column in which an outer rectangular steel pipe column and a steel frame beam are joined, and inner steel pipes are provided on flanges of the steel beam beams at a pair of upper and lower column beam joints. Steel pipes that are joined together, and the outer sides of the inner steel pipes are arranged at intervals on the inner sides of the outer rectangular steel pipe columns, and the inner steel pipes and the outer steel pipe columns are filled with concrete. Concrete pillars.