JP2666866B2 - Steel plate concrete composite beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a steel plate-concrete composite beam composed of a composite of precast concrete and steel plate.

[Problems to be solved by the invention]

Conventional precast concrete beams are usually formed with the cross-sectional area of the entire cross-section of the concrete beam, so they are heavy and have poor workability during erection. Projecting is required. There are also problems such as many restrictions on beam penetration.

On the other hand, the steel beam requires fireproofing work after the installation, which requires time and labor for construction, and the rigidity of the flange is poor, so that there is always a problem of deformation and bending.

The present invention has been made by focusing on the respective drawbacks of the two structures, and aims at newly proposing a composite structure beam capable of solving both problems at the same time and reducing the weight and improving the rigidity. .

[Means for Solving the Problems] In this invention, the web is formed of steel plate, and the flanges on both sides are formed of precast concrete, respectively.
It reduces the weight and improves workability compared to the case of the precast concrete structure alone, and at the same time, compensates for the lack of rigidity of the steel structure structure alone and eliminates the complexity of on-site work.

The upper and lower ends of the steel plate are fixed in the flange of the precast concrete and integrated, and the composite beam has an H-shaped cross-sectional shape.

 Both sides of the steel sheet are coated with a refractory coating before construction on site.

The upper and lower main reinforcements and the stirrups that restrain them are arranged in the upper and lower flanges of the precast concrete, and the stirrups in the upper flange protrude upward from the flanges and are cast in place cast concrete to be cast later. Thus, a fixing portion is formed to be fixed on the sheet.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings showing an embodiment.

The steel plate-concrete composite beam B according to the present invention comprises a steel plate 1 forming a web and precast concretes 2 and 2 forming a flange, and as shown in FIGS. The concrete 6 is cast and constitutes a beam.

As shown in FIG. 1, the upper and lower ends of the steel sheet 1 are fixed in the precast concretes 2 and 2 and are integrated therewith, and a refractory coating material 7 is attached to both surfaces of the steel sheet 1 before construction on site, or The coating is applied by spraying.

1 and 2 from both ends of the steel plate concrete composite beam B.
As shown in the figure, the steel plate 1 for joining to the column C is exposed from the precast concretes 2 and 2 and the refractory coating material 7,
At the time of erection, as shown in FIG. 2, the exposed portion is joined by bolts 9 to a plate 8 projecting from the side surface of the column C, and is supported until the concrete 6 is completely poured.

Also, as shown in FIG. 2, the upper main bar 3 and the lower main bar 4 arranged in the precast concrete 2 and 2 of the upper and lower flanges are connected to the main bar penetrating the column C by the joint hardware 10 or the like near the joint with the column C. Connected.

After erection of the steel plate-concrete composite beam B and connection of the steel plate 1 to the column C by the upper main bar 3 and the lower main bar 4, the upper main bar 3 'is laid on the upper precast concrete 2 by passing through a stirrup 5 described later. This is connected in the same manner as the upper main reinforcement 3, and furthermore, as shown in FIG. 2, a normal stirrup 5 'is arranged around the exposed portion of the steel plate 1 and concrete 6 is cast to complete the beam.

FIGS. 3 to 5 show a concrete example of the production of the steel plate-concrete composite beam B. The upper and lower precast concretes 2 and 2 have an upper main bar 3, a lower main bar 4 and a star for restraining them. Wrap 5 is arranged.

The stirrup 5 in the upper precast concrete 2 protrudes upward from the upper surface thereof, and is fixed to the concrete 6 which is cast at the tip as shown in FIGS.
A hook-shaped fixing portion 5a is formed which engages with the upper main reinforcement 3'which is arranged later.

The stirrup 5 in the lower precast concrete 2 is arranged so as to surround the entire lower main bar 4.

In the embodiment shown in FIG. 3, the stirrups 5, 5 in the upper and lower flanges are bent and welded to the side surfaces of the steel plate 1.

In the embodiment shown in FIG. 4, the upper and lower stirrups 5 and 5 are arranged so as to penetrate the steel plate 1, and the upper and lower ends of the steel plate 1 are partially cut in the length direction, and this portion is bent to be bent. And precast concrete 2 and 2 are improved in unity.

In the embodiment shown in FIG. 5, the stirrups 5 and 5 are arranged in a manner to penetrate the steel plate 1 as in the case of FIG. The stud bolt 11 is joined to both sides of the stud.

As shown in the figure, the upper surface of the upper precast concrete 2 is provided with some unevenness in order to increase the adhesion with the concrete 6 to be poured.

〔The invention's effect〕

The present invention is as described above, since the web is made of steel plate and the flange is made of precast concrete, and is formed by taking advantage of the respective structural advantages, that is, a single sheet steel plate and a flange that become a web The joints of the precast concrete that are to be joined are tied together using the bearing strength of the concrete, and the force generated at the flange is supported by reinforced concrete.It has the advantages of both steel frames and concrete, and has a higher weight than conventional precast concrete beams. Can be reduced to approximately 60%,
The rigidity is higher than that of steel beams.

In addition, by applying a refractory coating to the steel sheet at the time of manufacturing, the on-site work can be simplified, and the rigidity of the entire beam can be increased by adjusting the size of the flange.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a production example of the present invention, FIG. 2 is an elevation view showing a state of joining to a pillar, and FIGS. 3 to 5 are axial views showing details of the present invention. It is sectional drawing. B ... Steel plate composite beam, 1 ... Steel plate, 2 ... Precast concrete, 3 ... Top main reinforcement, 3 '... Top main reinforcement, 4 ... Bottom main reinforcement, 5 ... Stirrup, 5a ...
Fixing part, 5 '... stirrup, 6 ... concrete,
7: Fireproof coating, 8: Plate, 9: Bolt, 10
…… Fittings, 11 …… Stud bolts, C …… Pillars.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshihiko Toyosawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Fumihiko Mitsuhiro 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Koichi Otsuka 1-3-11 Takinogawa, Kita-ku, Tokyo Kawada Kogyo Co., Ltd. (72) Inventor Yumi Kaneko 1-3-1-11 Takinogawa, Kita-ku, Tokyo Kawada Kogyo Co., Ltd. (56) References JP-A-63-47451 (JP, A) JP-B-51-34647 (JP, B2)

Claims (1)

(57) [Claims] 1. A steel sheet forming a web and a precast concrete forming flanges on both sides have an H-shaped cross-sectional shape, and the steel sheet has upper and lower ends fixed in the precast concrete and integrated with the precast concrete. Both sides of the steel plate are coated with a fire-resistant coating material, and a main bar and a stirrup for restraining the main bar are arranged in the flange of the precast concrete, and the stirrup in the upper flange is upward from the upper surface of the flange. A steel plate-concrete composite beam characterized by having a projecting part and a fixing part formed in cast-in-place concrete.