JPS585764Y2 - Concrete composite beam with I-beam with irregular flange and corrugated deck plate - Google Patents

Description

[Detailed description of the invention] The present invention uses a ■-shaped beam with irregularly shaped flanges and a corrugated deck plate to form a so-called composite beam that integrates a steel beam and a concrete floor. - Instead of supporting on the upper surface of the flange of the shaped beam, it is supported on the lower surface of the flange, and in this case, a sufficient concrete inflow space is formed between the lower surface of the beam flange and the deck plate, making it suitable for pouring floor concrete. Let enough concrete flow into this area, and then
Together with the adhesion force with the shaped beam, the concrete strength in this area is increased, and the strength of the composite beam is increased.

As for the composite beam of this I-shaped beam and corrugated deck plate, the one shown in FIG. 1 has already been proposed.

This is done by cutting off only the upper surface side of the lower surface of the concave flange b of the I-shaped beam a, and slanting the deck plate d diagonally downward toward the edge of the corrugated groove. The flanges b are placed close to each other, and the floor concrete e is placed on the deck plate d.

However, the height of the corrugated groove of the corrugated deck plate d is low at the tip of this slope C, which is approximately ÷ the height, and the top surface of this slope C is close to the bottom surface of flange b of beam body a. Therefore, even if floor concrete is poured here, it is impossible to sufficiently fill the lower surface of flange b of beam a with concrete.

In order to allow sufficient concrete to flow here, the upper surface of slope C of deck play) d and the flange b of beam body a are
If you create a sufficient gap here instead of placing them close to each other, the floor will become thicker, which would be wasteful, and this construction method is not possible.

Therefore, in a composite beam, the part affected by this stress will not be sufficiently reinforced, and even if the deck plate is not supported on the top surface of the ■-shaped beam but supported on the bottom surface of the beam, there are various advantages. However, a decisive defect arises in that the strength 6 of the lung field of this composite beam is unstable.

In order to completely eliminate such defects, the present invention bends the entire tip of the corrugated deck plate that faces the irregularly shaped flange of the I-beam, and places a bent part here.
By providing a sufficient space between the bent portion and the flange of the I-shaped beam, the above-mentioned defects are completely eliminated and a composite beam with higher strength as a whole is formed.

This will be explained with reference to the diagram.

Reference numeral 1 is a ■-shaped beam body, and its upper flange 2 is an irregularly shaped flange having a concave upper surface.

Reference numeral 3 denotes a corrugated base plate, and its tip facing the square beam 1 is bent as a whole from the main body to form a bent portion 4 here.

Reference numeral 5 designates an angle fixed to the web 6 of the square beam 1 for supporting the bent portion 4 of the pivot plate 3.

Note that it is more convenient to support the angle 5 if it is formed into an obtuse angle.

In this way, the bent portion 4 of the deck plate 3 supported by the angle 5 of the ■-shaped beam 1 and the flange 2 of the beam 1 are connected.
A space 8 is provided between the two to allow at least the aggregate of the poured concrete 7 to flow smoothly.

The aggregate gravel for poured concrete 7 usually has a diameter of 15 mm.
-20mm is common, so this space should be at least 25mm.

Reference numeral 9 denotes a shear connector welded to the upper surface of the concave flange 2 of the beam body 1, and its leading end 9' extends from the end surface of the flange 2 and reaches near the beginning of the bending part 4 of the deck plate 3. Close.

In FIG. 3, the concave flange 2 of the beam body 1 has horizontal parts 2' at both ends thereof, and a shear connector 9 is mounted on the horizontal part 2'.
This makes it easy to weld accurately.

What is shown in FIG. 5 shows a method for attaching the shear connector 9 welded to the flange 2 of the beam body 1. This shear connector 9 can be efficiently welded at the factory.
The tip 9' is bent into the plane of the flange 2, and when necessary, the tip 9' is tapped at the site so that it extends perpendicularly to the flange 2. If it is convenient for transportation or construction, It is closed.

The tip 9' extending from the flange 2 is used to supplement this part of the composite concrete floor, which is weakest against shearing force in the beam axis direction.

10 is a reinforcing bar inserted into the corrugated groove of the corrugated deck plate 3; 11 is a reinforcing bar inserted through the web 6 near the bottom surface of the flange 2 of the beam body 1; and 12 is the entire tip of the corrugated deck plate 3 bent. This is the pleat part that is created to form the new song part 4.

The device shown in FIG. 6 is a buckling prevention device for a floor concrete plate 30, in which a buckling prevention fitting 13 formed in a substantially U-shape is attached to the groove 3' of the corrugated floor concrete plate 3. and achieve that purpose.

The same metal fitting 13' shown in Figure C has a U shape on both the upper and lower surfaces.
It is formed into a letter shape.

Fig. 7 shows examples of the ■-shaped beam body 1 with an irregularly shaped flange in which the upper flange 2 is formed in a concave shape, and ``A'' in ``A'' and ``H'' indicate each form of the concave shape, and ``A'' in b is a commercially available product. Concave flanges can be formed more easily than conventional products.

In the present invention, a shear connector 9 and reinforcing bars 11 are provided on the beam body 1, and an angle 5 is fixed to the web 6 of the beam body 2, and the tip of the bent portion 4 of the deck plate 3 is supported on this angle 5. Then, floor concrete 7 is poured over these.

The poured floor concrete 7 is placed between the lower surface of the flange 2 of the beam body 1 and the bent portion 4 of the base plate 3.
Through the space 8 formed between the flange 2 and the flange 2, the flange 2 can be sufficiently poured onto the lower surface of the flange 2.

In practice, during this pouring, a felt tape or the like is attached to the web 6 of the beam 1 facing the tip of the bent portion 4 to prevent the concrete from flowing out during this time.

Furthermore, in the case of a small-sized keystone plate or keystone plate, this problem can be prevented simply by using a long angle 5.

In the present invention, since the deck plate 3 is arranged at the lower part of the upper flange 2 of the beam body 1, the floor surface can be lowered accordingly, and the overall height of the multi-story building can be lowered. Overall, the material can be saved.

Further, since the deck plate 3 is not installed on the upper surface of the beam body 1, it is possible to use the upper surface of the beam body as a passage during work, and the work efficiency is good.

In particular, since the tip of the stick plate 3 is entirely bent to provide a bent portion 4, this bent portion 4 and the beam body 1
A sufficient space can be formed between the flange 2 and the flange 2 without affecting the floor thickness etc. Therefore, this area can be filled with sufficient concrete to create the highest stress as a composite concrete floor. It is possible to reinforce this part and form a strong composite beam as a whole.

In addition, since the flange 2 of the beam body 1 is formed in a concave shape, concrete adheres well at the obtuse angle portion formed between the concave back slope and the vertical web 6, and furthermore, the back surface of the flange 2 By matching the inclination with the inclination of the bent portion 4 of the deck plate 3, sufficient concrete 7 is poured into this mechanically most important part together with the space 8, and the concrete is well poured in this part. It is possible to grasp the bottom shape of a strong composite beam.

Furthermore, even if the floor thicknesses on the left and right sides of the beam body 1 are different, this can be dealt with simply by changing the mounting position of the angle 5.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a composite concrete floor that has already been proposed, Figure 2 is a vertical side view of a composite beam according to the present invention, Figure 3 is a vertical side view of another embodiment, and Figure 4 is a side view of a composite beam according to the present invention. Figure 5 shows the deck plate, A is its perspective view, the opening is a general cross-sectional view, C is a side view of the bent part, Figure 5A is a perspective view showing how to install and use the shear connector on the flange of the beam, and the opening of the same figure is the other one. FIG. 6A is a vertical cross-sectional side view showing a buckling prevention fitting attached to a corrugated deck plate; FIG. 6C is a perspective view of the same fitting; FIG. The figure shows a number of embodiments of flanges having a concave upper surface, and numerals 99 and 2 in the figure a indicate each concave form, and 99 b and iii in the same figure show various aspects of the respective embodiments. 1... Beam body, 2... Flange, 3...
...Corrugated deck plate, 4...Bend portion, 5...Angle, 6...Web, 7
...Concrete, 8...Space section.

Claims (2)

[Scope of utility model registration request] (1) An angle 5 is fixed to the web 6 of the I-shaped beam 1 having a concave upper flank 2' at an appropriate distance from the upper flange 2', and one end is bent from the main body. The end of the bent portion 4 of the corrugated deck plate 3 having the bent portion 4 is supported by the angle 5 to create a space between the bent portion 4 and the upper flange 2 of the beam body 1. 8 and concrete 7 is poured over these I-shaped beams with irregular flanges and corrugated concrete composite beams. (2) A concrete composite beam made of a irregularly shaped flange ■-shaped beam and a corrugated deck plate as set forth in claim 1 of the utility model registration claim in which the angle 5 is formed at an obtuse angle.