JPH0610010Y2 - Composite beam - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a composite beam in a building.

"Prior Art" A composite beam in which a reinforced concrete slab is integrated with a steel beam and the reinforced concrete slab is used as a part of the beam is already known, and as a conventional technique thereof, Figs.
There is one shown in.

A shows that a large number of shear connector stud bolts 3 are erected on the upper end flange 11 of the H-shaped steel beam 1 by welding,
Replace these stud bolts 3 with reinforced concrete slabs 2
It is embedded inside.

Further, as a modification thereof, there is one in which deformed reinforcing bars are cut to a required length in place of the stud bolts and used (Japanese Utility Model Publication No. 53-28262).

B shows a plurality of two-arm type shear connector rebars 4 which are sequentially arranged on the upper end flange 11 of the H-shaped steel beam 1 in the material length direction of the steel beam 1 and are welded together. The connector reinforcing bar 4 is embedded in the reinforced concrete slab 2.

In addition, as a modification, a series of long reinforcing bars are bent in a zigzag shape instead of the shear connector reinforcing bars, and the bent parts are further folded to weld these bent bent parts to the upper end flange of the steel beam. There is one that has been made (Japanese Utility Model Laid-Open No. 48-80305).

In C, a large number of shear connector shaped steels 5 having an appropriate length are sequentially arranged on the upper end flange 11 of the steel beam 1 of H-shaped steel in a direction orthogonal to the material length direction of the steel beam 1 and welded to each other. Shaped steel 5
Embedded in a reinforced concrete slab 2.

D is a steel frame beam 1 made of H-shaped steel, and an upper end flange 11 thereof is provided with a large number of one-arm type shear connector rebars 6 arranged in sequence in the material length direction of the steel beam 1 and welded together. It is embedded in a reinforced concrete slab 2.

By the way, recently, steel beams called striped H-shaped steel have come to be used. As shown in FIGS. 5A and 5B, the striped H-section steel is formed by integrally forming a large number of projections 7 on the upper and lower flanges 11 and 12 in the steel beam 1 of the H-section steel by roll forming by roll forming. The projection 7 of the upper end flange 11 is embedded in the reinforced concrete slab 2.

"Problems to be solved by the device" However, modified examples of FIGS. 4A to 4D and FIG.
In the case of Japanese Patent No. 8262), a large number of shear connector materials have to be prepared and welded to each other, which requires a lot of time and labor to process and attach the shear connector material, resulting in a high cost. Further, in the case of the modified example shown in FIG. 4B (Japanese Utility Model Laid-Open No. 48-80305), the bending of the reinforcing bar is extremely troublesome and there are many specific welding points, which further increases the cost.

In the case of FIGS. 5A and 5B, since the projection 7 is roll-formed at the stage of manufacturing the shaped steel in the factory, the projection 7 is also attached to the lower end flange 12 due to the roll forming, and this is completely The extra amount increases the amount of iron, which is uneconomical. In addition, because of roll forming, there are restrictions in terms of time, size, quantity, etc. in manufacturing, and there is a drawback that generality and freedom are lacking as compared with the case of using general H-section steel.

Furthermore, the above-mentioned conventional shear connector materials and projections 7
In the above, all of them are only shearing force treatments for preventing slippage in terms of stress, and axial force treatments of the flange as bending resistance cannot be expected at all.

The present invention is intended to solve these conventional problems.

[Means for Solving the Problem] In order to achieve the above object, the present invention provides, on the upper surface of the upper end flange 11 of the steel beam 1, one to several straight deformed reinforcing bars 8 aligned with the steel beam in the material length direction. Are arranged, and the one to several deformed reinforcing bars 8 and the steel beam 1 thereof are appropriately welded and integrated with each other.

[Operation] With the above configuration, the deformed bar 8 is semi-automatically or manually welded to the upper end flange 11 of the steel beam 1 continuously or intermittently and is welded to the deformed rebar 8 and carried to the construction site. Then, the deformed bar 8 is embedded in the reinforced concrete slab 2.

As a result, the deformed rebar 8 is subjected not only to the bond shearing force treatment for preventing slippage but also to the axial force treatment of the upper end flange 11 as bending resistance.
Can be effectively used as part of the beam flange, and the structural yield strength of the steel frame beam 1 can be greatly enhanced.

"Embodiment" FIGS. 1 and 2 show an embodiment of the present invention in which two deformed rebars 8, 8 are juxtaposed on an upper end flange 11 of an H-shaped steel frame beam 1 and are interrupted. It consists of welding stop 81.

FIG. 3 shows an example in which one deformed bar 8 is attached in the same manner as the previous example.

[Advantage of the Invention] According to the present invention, since one or several straight deformed reinforcing bars 8 are attached to the upper end flange 11 of the steel beam 1 so as to align the material length direction with the steel beam, many shear connector materials are provided. It is possible to construct a composite beam without using, and without complexly bending the deformed bar, and it is possible to greatly reduce the manufacturing labor.

Since the deformed bar 8 is straight and is attached in the material length direction of the steel beam 1, not only the shearing force treatment for preventing slippage as a shear connector but also the axis of the upper end flange 11 as bending resistance in the steel beam 1 Therefore, it is possible to increase the strength of the steel beam and to reduce the total amount of iron as a composite beam.

Since the protruding shape of the shear connector is not large, the work safety is high for workers walking on steel beams during construction.

Since it is a combination of general existing materials, it can be easily manufactured.

Overall, cost reduction is possible.

And so on.

[Brief description of drawings]

1 is a cutaway front view showing an embodiment of the present invention, FIG. 2 is a cutaway side view of the same example, FIG. 3 is a cutaway front view showing another embodiment, and FIGS. A cutting front view and a cutting side view showing a conventional example, and FIGS. 5A and 5B are a cutting front view and a main part enlarged plan view showing another conventional example. 1 …… Steel beam 2 …… Reinforced concrete slab 11,12 …… Flange 8 …… Deformed bar 81 …… Intermittent welding stop 3 …… Sher connector stud bolt 4 …… Sher connector rebar 5 …… Sher connector shaped steel 6 …… Shear connector rebar 7 ... Protrusion

Claims (1)

[Scope of utility model registration request] Claims: 1. On the upper surface of an upper end flange 11 of a steel beam 1, one to several straight large-diameter deformed rebars 8 having the same material length direction as the steel beam are arranged, and the deformed rebars 8 are formed. A composite beam, wherein the upper end flange 11 of the steel beam 1 is appropriately welded and integrated.