JPS6056858B2 - composite floor slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite floor slab composed of a reinforced concrete slab and a steel girder supporting the same using deck flutes, which has improved workability and structure compared to conventional composite slabs. The purpose is to provide a synthetic deck structure with excellent mechanical properties as a member.

As a floor construction method used for steel-framed buildings, there is a method of pouring concrete using deck plates.

This construction method allows deck plates to be laid in parallel to the steel frame construction, and in addition to being effective in terms of safety management on site, since the concrete is poured on site, the steel frame can be constructed with high precision, unlike the case of precast plates. There is no need to request. Furthermore, it is a practical construction method in that it can achieve a composite effect with the steel frame and ensure the in-plane rigidity of the slab. Figures 1a to 1e show composite deck slabs made by the above construction method. 1. The upper flanges of the large steel frame a and the small steel frame are set on the same horizontal plane by means of bolts, welding, etc.

2. Deck plate c is made by placing large and small pieces of rice on the upper flange and welding them together.

The width of deck plate c in this case (245 to 1055T
Since the width (about 6 to 12 m) is smaller than the span (about 6 to 12 m), several deck plates c are laid one on top of the other in the width direction. 3 Filler g is installed in the gap between deck plate c and steel frames a and b.

2. A required number of studs d are welded onto the upper flanges of the large porcelain a and the small porcelain to integrate the concrete slab e.

It has the following characteristics.

However, this conventional method has the following problems.

1. In order to connect the reinforced concrete slab e and the steel frames a and b, it was necessary to weld the stud d onto the flange on the steel frame, and this process was a bottleneck during construction.

2 Even when striped H-shaped steel with high adhesion performance to concrete is used for steel frames a and b, the peeling force between reinforced concrete slab e and steel frames a and b is generated when external force is applied to the composite deck slab. It was necessary to take some kind of restraint measures against him.

The synthetic floor slab of the present invention was invented to solve the problems of the conventional synthetic floor slab as described above, and will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 indicates a steel beam made of H-shaped steel, and reference numeral 2 indicates a small beam, and there is a height difference between the top surface of the upper flange of the large beam 1 and the top surface of the upper flange of the small beam 2.

The deck plate 4 is placed on the upper surface of the lower flange of these, and the upper flange is buried in concrete 6 cast on the upper surface of the deck plate. (1) When the upper flange of the main beam 1 is located below the upper flange of the small beam 2.

2 to 7 show an embodiment in which the upper flange of the girder 1 is on the lower side; in this case, the upper flange of the small beam 2 is wrapped in concrete 6.

Figure 2 shows an example of a beam connection in which the upper flange of the small beam 2 is located above the upper flange of the large beam 1 by the required height D. Bolt connection is performed using steel materials such as steel plates. I am doing it.

This joining may be performed by welding or the like, and the joining means and the shape of the joint are not limited. In addition, in the example shown in the figure, the striped H
Shaped steel is used.

This striped H-section steel is used as a rigid material with high adhesion performance to concrete, and has uneven stripes on the upper surface of the flange and, in some cases, on the web surface. Furthermore, by providing striped H-shaped steel on the girder 1 and welding studs 7 as necessary, the composite deck slab can be further integrated.
Figure 4 shows how the deck plate 4 is laid.
1. Regarding the width direction of the deck plate 4, the distance between the beams shown in the floor beam profile diagram in FIG. 3 is several times larger than the width W of the deck plate 4, and several plates are laid one on top of the other in the Ls direction.

At this time, the deck plate 4 in contact with the beam 2 must be laid in close contact with the web of the beam 2 to prevent concrete from flowing out. Also, depending on the design, the height H of the deck plate becomes larger than the distance D between the upper flanges of the main beam 1 and the small beam 2, making it difficult to make the deck plate 4 tightly contact the web of the small beam 2 as described above. However, even in that case, steel plates etc. can be laid to prevent concrete from flowing out. The longitudinal installation of the two-deck plate 4 is carried out in the conventional manner by placing its ends on beams.

Note that these deck plates 4 are fixed to the steel beams by welding or the like. Figure 5 shows the completed composite deck slab. If necessary, studs 7 are welded onto the soil flanges of the girder 1, and striped H-beam steel is used for the girder 1 as well.

In addition, in the case of a floor beam profile diagram as shown in Figure 6, the central small beam 2
The deck plate 4 can be laid in the same manner as the girder 1 by aligning the upper flange surface of the girder 1 with the upper flange surface of the girder 1.

In addition, as shown in Figure 7, if the beam is aligned with other beams 2, angle steel or the like can be used as a deck plate installation material for the web of the central beam 2''.') The upper flange of the beam 1 is small. When it comes above the upper flange of beam 2.

8 to 14 show an embodiment in which the upper flange of the girder 1 is placed on the upper side, and in this case, the upper flange of the girder 1 is wrapped in concrete 6.

Figure 8 shows an example of joining the main beam 1 and the small beam 2.
Figure a shows a case where angle steel is welded to the web of the main beam 1 and bolted to the small beam 2, figure b shows a case where an H-shaped steel is welded to the web of the main beam 1 and bolted together through a steel plate, and figure c shows a case where the angle steel is welded to the web of the main beam 1 and bolted to the small beam 2. In the case where the section steel is welded to the girder 1 and bolted through the steel plate,
The upper flange of the large beam 1 is connected to the upper flange of the small beam 2 at a position higher than the upper flange by a required height D''.

In this case as well, the joining means and the shape of the joint do not matter. Next, install the deck plate 4 on the short side Ls of the minimum rectangle made by the main beam 1 and the small beam 2 in the floor beam configuration diagram in Figure 9.
The direction will be explained in the length direction of the deck plate.

Several deck plates 4 are laid one on top of the other in the width direction, and as shown in FIG. 10, the deck plates 4 that are in contact with the girder 1 are brought into close contact with the web of the girder 1 to prevent the concrete 6 from flowing out.

In addition, if the height H of the deck plate 4 is larger than the distance D'' between the upper flanges of the main beam 1 and the small beam 2, the space between the deck plate 4 and the web of the main beam 1 is closed with a steel plate, etc., as shown in Fig. 12. .

2. Regarding the length direction of the deck plate, as shown in FIGS. 11 and 13, a steel material for installing the deck plate is attached to the girder 1, and the end of the deck plate 4 is placed on it.

FIG. 14 shows the state of completion, and studs 7 are installed and reinforcing bars are arranged as necessary. This invention has the above-mentioned configuration, and a difference in height is provided between the upper flange of the large steel beam and the upper flange of the small steel beam, and the concrete of the floor slab is wrapped in the concrete slab so that the upper flange of the steel beam located on the upper side is wrapped in the concrete slab. Because it is poured, it is possible to transfer stress between the steel beam and the concrete slab in this area, providing a structure with excellent composite effects. As a result, the stud welding process on the flange on the steel beam, which has traditionally been a bottleneck in construction, can be reduced or eliminated.
In addition, in conventional structures, even when striped H-beams with high adhesion properties were used for steel beams, it was necessary to take some kind of measure to prevent peeling between the reinforced concrete slab and the steel beams, but in this invention, special peeling prevention measures have been taken. becomes unnecessary.

[Brief explanation of the drawing]

Figure 1 shows a conventional composite beam; Figure 1a is a floor beam profile, Figure 1b is a plan view, Figure 1c is a cross-sectional view in the length direction of the deck plate, and Figure 1d is a cross-sectional view in the width direction. , Figure 2(e) is a perspective view of the beam flange part, Figures 2 to 7 show an example in which the upper flange of the small beam is on the upper side, and Figures 2(a) and 2(b) are longitudinal sections of the beam joint. Fig. 3 is a plan view of the deck, Fig. 3 is a plan view of the floor beam, Figs. Fig. 6 is a longitudinal cross-sectional view of the composite deck slab, Fig. 6 is a cross-sectional view of the floor beam, Fig. 7 is a longitudinal cross-sectional view of another example, and Figs. 8 to 14 are the implementation when the girder top flange is on the upper side. An example is shown in Figure 8 a-
c is a vertical cross-sectional view of the beam joint, d is its plan view, Fig. 9 a and b are floor beam profile views, Fig. 10 a1, Fig. 11 a1, 1st
Figure 2 a1 and Figure 13 a are longitudinal sectional views showing how the deck plate is laid, Figure 10 b1 Figure 11 b1 12
Figure b1 and Figure 13 b are Figure 10 a1 and 11, respectively.
Figure a1 is a plan view of Figures 12a and 13a, and Figure 14 is a sectional view of the completed composite deck. 1...Large beam, 2,2''...Small beam, 3.
...Column, 4...Deck plate, 5...
・Reinforced steel, 6... Concrete, 7...
Stat.

Claims (1)

[Claims] 1. Beams are joined by creating a height difference between the horizontal plane formed by the upper flange of the steel frame main beam and the horizontal plane formed by the upper flange of the steel frame small beam, and in this joined large beam and small beam, the upper flange forming the lower horizontal plane is A composite floor slab characterized by a deck plate being laid on the flange, the upper flange forming the upper horizontal surface being wrapped in a concrete slab, and concrete being poured.