JP2002188209A - Buried slab type composite beam in steel-framed flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buried slab type composite beam in a steel-framed flange in which beam depth as the composite beam is reduced by properly arranging the top face of the upper flange of a steel-framed beam and the top face of slab concrete. SOLUTION: Slab receiving jigs 4 are installed at the upper positions of the web 1c of the steel-framed beam 1. Connectors 5 such as studs are mounted on either one or both of the upper flange 1a or the web 1c. Slab concrete is placed on the slab receiving jigs so that the top face of the upper flange and the top face of slab coincide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of composite beams composed of steel beam flanges and slab concrete in a steel concrete structure, in which the upper surface of the upper flange of the steel beam is aligned with the upper surface of the slab concrete. The present invention relates to a composite beam having a steel slab embedded in a slab with a reduced beam width as a composite beam.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional steel concrete structure has a shape in which an upper flange 1a of a steel beam 1 is attached to a lower surface of a slab concrete 2 (for example, Japanese Patent Application Laid-Open No. 6-257244). (See the description of FIG. 1 and FIG. 5 in the publication).

According to FIG. 2 of JP-A-11-166292, it is recognized that the upper flange of the steel beam is swallowed at most within the thickness range (intermediate portion) of the slab concrete.

[0004]

For example, in a construction plan as shown in FIG. 5, in the case of a structure in which the column at the point A is eliminated, the steel beam B in the hatched portion necessarily has a relatively large span. There is no other choice but to use large steel beams. on the other hand,
Since the span of the steel beam C in the direction between the beams is small, a steel frame having a small beam can be used.

[0005] However, as shown in FIG. 4, for example, when the steel beams 1 and 1 'whose beams are different in size are orthogonal to each other, the ceiling 3' of the building is eventually turned on under the condition of the larger beam. The height is fixed. That is, the position of the ceiling 3 ′ is a position below the lower flange 1 b of the steel beam 1 where the beam is large. That is, in the case of the prior art, there is a problem that the size of the beam of the steel beam 1 directly determines the height of the ceiling 3 ′.

Therefore, in economically constructing a building having a high ceiling, even if an attempt is made to use a steel beam with a small beam forcibly, from the viewpoint of securing rigidity to prevent a floor vibration problem due to insufficient rigidity, At present, it is impossible to reduce the beam width of steel beams.

Therefore, an object of the present invention is to align the upper surface of the upper flange of a steel beam with a large height with the upper surface of the slab concrete, thereby subtracting the thickness of the slab concrete from the beam of the steel beam to raise the ceiling. And the construction effect of steel beams and concrete (composite beams) makes it possible to design and construct the whole beam small, and contributes to a reasonably high ceiling. An object of the present invention is to provide a composite beam embedded in a slab of a flange.

[0008]

Means for Solving the Problems As means for solving the above-mentioned problems of the prior art, a composite slab-embedded beam of steel flange according to the first aspect of the present invention comprises an upper flange of steel beam and slab concrete. In a composite beam obtained by integrating a slab receiving jig, a slab receiving jig is attached above the web of the steel beam, and a connector such as a stud is installed on one or both of the upper flange and the web. The slab concrete is cast so that the upper surface of the upper flange coincides with the upper surface of the slab.

According to a second aspect of the present invention, in the composite beam having a slab embedded steel slab according to the first aspect, the steel beam is an H-beam.

[0010]

1A and 1B show an embodiment of an embedded composite beam of a steel flange according to the first aspect of the present invention.

FIGS. 1A and 1B both show composite beams in which the upper flange 1a of the steel beam 1 and the slab concrete 2 are integrated, but FIG. 1A shows a slab support at a position above the web 1c of the steel beam 1. The jig 4 is attached, and the upper flange 1
A connector 5 such as a stud is installed vertically downward on the lower surface of the slab concrete jig 4 and the upper surface of the upper flange 1 a of the steel beam 1 is aligned with the upper surface of the slab 2 on the slab receiving jig 4. 1 shows an embodiment of an embedded composite beam of a steel flange on which is cast.

FIG. 1B shows the same composite beam,
A slab receiving jig 4 is attached to a position above the web 1c of the steel beam 1, and connectors 5 such as studs are horizontally installed on both sides of the same web 1c and slightly below the upper flange 1a. An embodiment of a composite beam formed by casting slab concrete in which the upper surface of the upper flange 1a and the upper surface of the slab 2 are aligned on the slab receiving jig 4 is shown.

FIG. 3 shows the case where the steel beams 1 and 1 ′ whose beams differ greatly in size are orthogonal to each other as indicated by III in FIG.
An embodiment of a beam-column joint in which the height of the ceiling 3 is realized with reference to the steel beam 1 'having a smaller beam by applying the composite beam of the present invention to the steel beam 1 having a larger beam is shown. ing.

That is, the characteristic point in FIG. 3 is that in FIG. 5, a composite beam is formed by integrating an upper flange 1a of a steel beam 1 having a large span in the B direction and a large beam and a slab concrete 2 in the same direction. In FIG. 5, a steel beam 1 ′ having a small beam error in the C direction means that the lower flanges 1 b have the same height. in this way,
When the composite beam of the present invention is applied, the embodiment shown in FIG. 3 can be easily performed. That is, the substantial beam is reduced, and the height of the ceiling 3 is the same as before (for example, the conventional example in FIG. 4).
Is higher by the h dimension than the height of the ceiling 3 '.

In summary, the composite beam of the present invention is formed by casting slab concrete in which the upper surface of the upper flange 1a of the steel beam 1 and the upper surface of the slab 2 are aligned with each other. By subtracting the thickness T of 2, the entire beam can be reduced. By adopting the H-shaped steel for the steel beam 1, it is easy to secure the rigidity, it is possible to bear the load at the time of construction as an independent structural member, and it is easy to join with other members. .

Next, FIGS. 2A and 2B show an embodiment of the fireproof coating of the composite beam of the present invention described above.

In the composite beam, since the upper part of the steel beam 1 is buried and hidden in the slab concrete, the cost can be reduced as much as the fireproof coating of the same portion is not required. That is, FIG. 2A shows the upper surface of the upper flange 1 a of the steel beam 1, the web 1 c of the steel beam 1 exposed below the slab concrete 2, the slab receiving jig 4 attached above and the lower flange 1 b. An embodiment in which a refractory coating 7 is applied to all surfaces is shown.

FIG. 2B shows the upper flange 1 a of the steel beam 1 in consideration of the heat capacity of the slab concrete 2.
2 shows an embodiment in which the refractory coating on the upper surface of the first embodiment is omitted. In this case, there is an advantage that the upper surface of the slab can be formed smoothly.

[0019]

According to the first and second aspects of the present invention, in the composite beam with embedded steel flanges, steel beams having different beam sizes due to structural necessity are used or the beam size is small. In the case where the steel beam and the beam-column joint are perpendicular to each other, by applying to a steel beam having a large beam, it is possible to easily realize a ceiling height with a small beam. Even in that case, the proof strength and rigidity of the beam can be ensured high due to the combined effect.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing different embodiments of an embedded composite beam of a steel flange according to the present invention.

FIGS. 2A and 2B are cross-sectional views of an embodiment in which the composite beam is provided with a fireproof coating.

FIG. 3 is an elevational view of a beam-column joint at a portion where steel beams having different beam sizes are orthogonal to each other, designated as III in FIG. 5;

FIG. 4 is an elevational view showing a beam-column joint at a portion where conventional steel beams of different sizes differ from each other at right angles.

FIG. 5 is a plan view showing an example of a building structure.

[Explanation of symbols]

 Reference Signs List 1 steel beam 1a upper flange 2 slab concrete 1c web 4 slab receiving jig 5 connector

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiaki Ito 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Michikazu Kobayashi 8-21 Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Corporation Tokyo Main Store (72) Inventor Akio Kodaira 1-5-1, Otsuka, Inzai City, Chiba Pref.

Claims (2)

[Claims] In a composite beam in which an upper flange of a steel beam and slab concrete are integrated, a slab receiving jig is attached to a position above a web of the steel beam, and one or both of the upper flange and the web are provided. A connector such as a stud is installed, and slab concrete is cast on the slab receiving jig so that the upper surface of the upper flange of the steel beam coincides with the upper surface of the slab. Slab embedded composite beam. 2. The steel beam is an H-beam,
A composite beam embedded in a slab of a steel flange according to claim 1.