JPH04108701U - steel pipe concrete column - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a steel pipe concrete column with excellent fire resistance, earthquake resistance, and appearance. [Structure] An outer steel pipe 5 is inserted around the inner steel pipe 1 filled with concrete 2 via a fireproof coating layer such as concrete 4, and the upper end edge of the outer steel pipe 5 and the lower end edge of the beam 3 are The binding force is reduced by forming a small gap between them or by unbonding the outer steel pipe 5 with the concrete 4, which is a fireproof coating layer.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a steel pipe concrete column whose inside is filled with concrete.

0002

[Conventional technology]

In general, steel pipe concrete columns have excellent compressive strength, but local seating due to bending may occur. It is fragile and has low resistance to fire, requiring a fireproof coating around the steel pipe. .

0003 Therefore, conventional steel pipe concrete columns allow for a reduction in bearing strength and and unbond it, or put a fireproof covering such as concrete around it for fireproofing. There are many things that I did. Therefore, there are problems such as not being able to fully demonstrate the performance as a steel pipe column. there were.

0004

[Problem that the idea aims to solve]

This invention was devised to solve the above conventional problems, and its purpose is to It has excellent fire resistance and earthquake resistance, and can maintain the appearance of a steel pipe column. Our goal is to provide steel pipe concrete columns.

[0005]

[Means to solve the problem]

The steel pipe concrete column of this invention has a resistant structure around the inner steel pipe filled with concrete. extrapolating the outer steel pipe through the fire coating layer, restraining the inner steel pipe with the outer steel pipe, and It is characterized by being able to expand and contract in the vertical direction to prevent buckling.

[0006] The fireproof coating layer is characterized in that it is a concrete layer.

[0007] The buckling of the inner steel pipe due to an earthquake is prevented by restraining the outer steel pipe, and even if a fire occurs, the outer steel pipe is prevented from buckling. The side steel pipes are expandable and do not buckle, and are characterized by both earthquake resistance and fire resistance. .

[0008]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1 is an inner steel pipe with concrete 2 inside. is filled. A beam 3 is connected to the upper part of the inner steel pipe 1 and the concrete 2. It is.

[0009] The inner steel pipe 1 is covered with concrete 4 as a fireproof covering material. Ru. An outer steel pipe 5 is further inserted around the concrete 4. Not applicable The side steel pipe 5 and the concrete 4 may be in an unbonded state.

0010 Further, the outer steel pipe 5 has a predetermined gap S between the lower edge of the beam 3 and the floor. is forming.

[0011] Therefore, if the steel pipe concrete column of the above example is exposed to high temperatures due to fire, etc., The inner steel pipe 1 inside is protected by the concrete 4, and the axial strength is maintained. Furthermore, since the outer steel pipe 5 can stretch in the axial direction even when exposed to high temperatures, There is no risk of buckling.

0012 Figure 3 shows an innermost steel pipe 6 inserted inside the inner steel pipe 1, making the inside hollow. , shows another embodiment in which the weight of the pillar is reduced.

[0013]

[Effect of the idea]

A fireproof coating layer such as concrete is placed around the inner steel pipe filled with concrete. For example, the outer steel pipe can be unbonded with the refractory coating layer. By making it possible to expand and contract in the longitudinal direction of the top and bottom, we reduced the constraint, so this column Even if exposed to high temperatures such as fire, the strength of the inner steel pipe will not decrease, and the outer steel pipe will not buckle. There is no risk of this occurring, and a good appearance can be maintained.

[Brief explanation of drawings]

FIG. 1 is a side view of the steel pipe concrete column of the present invention.

FIG. 2 is a cross-sectional view taken along line E in FIG. 1;

FIG. 3 is a cross-sectional view of another embodiment.

[Explanation of symbols]

1 Inner steel pipe 2 concrete 3 Beam 4 Concrete 5 Outer steel pipe 6 Innermost steel pipe

Claims (3)

[Scope of utility model registration request] [Claim 1] An outer steel pipe is extrapolated around an inner steel pipe filled with concrete via a fireproof coating layer, and the inner steel pipe is restrained by the outer steel pipe, thereby ensuring both earthquake resistance and fire resistance. Steel pipe concrete column. 2. The steel pipe concrete column according to claim 1, wherein the fireproof coating layer is a concrete layer. 3. The steel pipe concrete according to claim 1 or 2, wherein a slit is provided in the outer steel pipe to enable it to expand and contract in the vertical and longitudinal directions, and to reduce its own restraint in order to prevent buckling. Pillar.