JP3134722B2 - Fire-resistant steel concrete composite - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory steel concrete composite structure used as a beam or a column in the fields of construction and civil engineering.

[0002]

2. Description of the Related Art Conventionally, a steel reinforced concrete composite structural material which is often used as a beam in the field of construction is, as shown in FIG. 9 (side view) and FIG. 10 (CC sectional view of FIG. 9). The H-shaped steel 1 composed of the lower flanges 1a and 1b is used as a beam main material, and the reinforcing steel structure in which the reinforcements 5 and 6 arranged around the web 1c of the H-shaped steel 1 are surrounded by the shear reinforcement 7 is concrete. This is the structure hardened at 8. In addition, 9 is a column, 10 is a gusset plate combining the column 9 and the H-section steel 1, and 11 is a floor slab.

[0003] The steel-framed reinforced concrete composite structural material having the above-described structure can be used for the upper and lower flanges 1a and 1b of the H-shaped steel 1 of the steel-framed reinforced concrete composite beam in the event of a building fire.
However, even if the strength deteriorates and melts due to fire heat, it has a structure that does not impair the function as a beam material with a reinforced structure and concrete.

[0004] The same applies to the case where the above-mentioned steel-framed reinforced concrete composite structural material is used as a column material.

FIG. 11 (cross-sectional view of composite beam and floor structure)
In the steel reinforced concrete composite structural material shown in FIG. 1, L-shaped members 12 and 13 are attached to the middle of the web portion 1c of the H-shaped steel 1, and between the L-shaped members 12 and 13 and the upper flange 1a of the H-shaped steel 1. The floor slab 11 is inserted, and the L-shaped members 12 and 13 are inserted.
A mortar 14 is cast between the upper flange portion 1a and the beam member using the H-section steel 1 and the floor structure are integrated.

[0006]

However, in the conventional steel reinforced concrete composite structure described with reference to FIG. 10, the work of fixing the main reinforcing bars 5 and 6 to the H-section steel 1 and the arrangement of the shear reinforcing bars 7 are required. However, there is a problem that a complicated work such as a drilling operation and a penetration operation or a welding operation of the H-section steel 1 into the web portion 1c and an operation of fixing the main bar 5 to the column 9 are required.

[0007] In the conventional steel-framed reinforced concrete composite structure described with reference to FIG.
Since the mortar is cast only between the upper flange 2a and the upper flange 1a, the web 1c of the H-section steel 1 is used at the time of a building fire.
, The lower flange 1b and the L-shaped members 12, 13
There is a danger that the function as a beam may be impaired due to strength deterioration and melting damage due to fire heat, and the beam structure has poor fire resistance.

[0008]

A first means for solving the above-mentioned problems is to provide a structural material on both sides of the H-section steel web.
A refractory steel-framed concrete composite structural material formed with projections for retaining the H-shaped steel and solidified with concrete between the outermost edges of the flanges of the H-shaped steel.

A second means for solving the above-mentioned problem is that a T-section steel is fixed to both flanges of the H-section steel, and the flange of the H-section steel is formed as a projection for maintaining the strength as a structural material.
A fire-resistant steel-framed concrete composite structure made of concrete between the outermost edges of a T-shaped steel flange. Further, a third means for solving the above-mentioned problem is to use a T-shaped flange on one of the H-section steels.
Fixing the section steel, and using the H-section steel flange as structural material
And the other of the T-shaped steel and the H-shaped steel
This is a fire-resistant steel-framed concrete composite structure material in which the space between the flange and the outermost edge of the flange is solidified with concrete.

The action in the rehabilitation will be described below. H
The projections formed on the web of the shaped steel have both the function of withstanding the strength of the beam when the flange is melted by a fire, the function of bearing the tensile stress, and the function of improving the adhesion of the concrete 8.

Further, by integrating the T-shaped steel and the H-shaped steel, projections can be easily formed, the strength is further increased, and the function of strengthening the adhesion of concrete is improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same parts as those in the above-described prior art are described with the same reference numerals.

FIG. 1 is a side view when the fire-resistant steel-frame concrete composite structure according to the present invention is used as a beam.
Numeral 1 denotes an H-section steel as a beam main material, which is composed of an upper flange 1a, a lower flange 1b and a web 1c. Further, as shown in FIG.
Projections 2, 2 'are provided on both lower sides of the web 1c of the shaped steel 1. The outermost edges of the flanges 1a and 1b are hardened with concrete 8. In addition, 11 is a floor slab.

The projections 2 and 2 'serve to improve the strength of the beam as a beam when the lower flange 1b of the H-section 1 is melted in the event of a fire, the function to bear the tensile stress, and the improvement of the adhesion of the concrete 8. It has functions.

FIG. 3 is a sectional view of a beam according to another embodiment of the present invention.
The protrusions 2a and 2b are added, and the structure is further improved in strength and adhesion of the concrete 8.

The above-mentioned projections 2, 2 ', 2a, 2b are formed by rolling the H-section steel 1 or by welding the projection bars to the web 1 by welding.
c.

FIGS. 4 (side view) and 5 (sectional view taken along the line BB in FIG. 4) show another embodiment relating to the formation of the above-mentioned projection.
This will be described below.

4 and 5, the projections 2c, 2c
d is fixed to the web 1c of the H-section steel 1 by bolts 12.

In FIG. 6 (sectional view), projections 2e, 2e
f is additionally attached above the web 1c.

The sectional views of FIGS. 7 and 8 relate to another embodiment of the projection of the H-beam 1 as the main beam.

FIG. 7 shows that a T-shaped steel 3 composed of a web 3a and a flange 3b is fixed to a lower portion of a lower flange 1b of an H-shaped steel 1 by welding or the like. It has the function of projections and reinforcing ribs.

FIG. 8 shows another modification of the embodiment shown in FIG. 7, in which T-shaped steel members 3 and 4 are fixed to the upper and lower sides of an H-shaped steel member 1 by welding or the like. , 1b
Is a refractory steel-framed concrete composite structural material in which the adhesion function of the projections and the concrete 8 is further improved.

[0023]

According to the present invention having the above construction, a projection is provided on the web of the H-section steel, or a flange of the H-section steel is formed by adding a T-section steel. Since the pulling side bears the stress on the pulling side instead of the conventional reinforcing bar, the reinforcing bar becomes unnecessary, and the work of arranging the reinforcing bar becomes unnecessary.

[0024] Further, since the reinforcing bar is not required, welding work for fixing the shear reinforcing bar to the web of the H-section steel and fixing the main reinforcing bar to the column material is unnecessary.

Further, even if the flange of the H-section steel is melted and damaged in the event of a fire, the projections maintain the strength as a structural material such as a beam or a column.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a fire-resistant steel-frame concrete composite structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of another embodiment according to the fire-resistant steel concrete composite structure of the present invention.

FIG. 4 is a side view of another embodiment of the fire-resistant steel concrete composite structure of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a sectional view of another embodiment according to the fire-resistant steel concrete composite structure of the present invention.

FIG. 7 is a sectional view of another embodiment according to the fire-resistant steel concrete composite structure of the present invention.

FIG. 8 is a sectional view of another embodiment according to the fire-resistant steel concrete composite structure of the present invention.

FIG. 9 is a side view of a conventional refractory steel concrete composite structure.

FIG. 10 is a sectional view taken along line CC of FIG. 9;

FIG. 11 is a cross-sectional view of another conventional refractory steel concrete composite structure.

[Explanation of symbols]

 Reference Signs List 1 H-section steel 1a Upper flange of H-section steel 1b Lower flange of H-section steel 1c Web of H-section steel 2 Projection 3 T-section steel 4 T-section steel

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeki Ito 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Kazuma Konno 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside Kokan Co., Ltd. (72) Inventor Toshiji Inosa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Kokan Co., Ltd. (72) Inventor Yoshiyuki Fujiwara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo In-company (56) References JP-A-1-290857 (JP, A) JP-A-63-308131 (JP, A) JP-A-64-10852 (JP, A) JP-A-8-49350 (JP, A) ) Japanese Utility Model 1986-201402 (JP, U) Japanese Utility Model 6-1-62006 (JP, U) Japanese Utility Model 4-27011 (JP, U) Japanese Utility Model 4-53363 (JP, Y2) Japanese Utility Model 5- 12415 (JP, Y2) Shogun 51 −4497 (JP, Y1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04C 3/293 E04B 1/16 E04B 1/94 E04B 1/30

Claims (3)

(57) [Claims] 1. Strength of structural steel on both sides of web of H-section steel
A refractory steel-framed concrete composite structural material formed with projections for retaining the H-shaped steel and solidified with concrete between the outermost edges of the flanges of the H-shaped steel. 2. A T-section steel is fixed to both flanges of an H-section steel.
A fire-resistant steel-frame concrete composite structure material in which a flange of a section steel is formed as a projection for maintaining the strength as a structural material, and a space between outermost edges of the flange of the T-shaped steel is solidified with concrete. 3. A fixed T-shaped steel on one of the flanges of the H-shaped steel, and <br/> projections for holding the strength of the flange of the H-shaped steel as a structural material, wherein the flange of the T-section steel H-shaped The other of steel
A fire-resistant steel-framed concrete composite structure made of concrete between the outer edges of the flange and the concrete.