JPS6338508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a support structure for a floor slab using an earthquake-resistant wall.

[Conventional technology]

Conventionally, in buildings with a rigid frame structure in the girder row direction and a shear wall structure in the beam direction, a beam-shaped part for the girder (to function as a girder) is attached to the upper edge of the shear wall constructed between the columns. A beam-like part with thicker walls was integrally formed on the wall. Small beams are installed at intervals of several meters between the beam sections of the opposing shear walls, so that the weight of the floor slab is supported by the beam sections at the upper edge of the shear wall via the small beams. was.

[Problem that the invention seeks to solve]

However, the above conventional example has the following problems.

In other words, since the beam type part for the large beam receives a large force at the part where the small beam is attached, the beam size (vertical width) of the beam type part
Because it was necessary to make the beams quite large, and because the beams were erected at intervals of several meters, the beam width (vertical width) of the beams was also quite large. These dimensions vary depending on the span of the building, but for example, the span in the beam direction is 6 meters and the span in the beam direction is 11 meters, which is common in multi-story apartment buildings.
For example, if we take a 3-meter building, the beam width (width) x beam size (vertical width) is 450 mm x 700 mm, and the beam shape for the girder at the top edge of the shear wall is 400 mm (beam width x beam size). ×650mm, as a small beam, beam width × beam size
The most common size is approximately 300mm x 600mm. By the way, it is preferable to place the ceiling board as high as possible within the range that can secure the space necessary for the equipment piping behind the ceiling, in order to make the most of the indoor space. However, in the conventional example above, If the ceiling panels are made higher, not only the large beams but also the beam-shaped portions and small beams at the upper edge of the seismic wall will have their lower ends protruding downward from the ceiling surface, impairing the aesthetics of the room and reducing the usability of the indoor space. It also gets worse.

In view of the above-mentioned conventional drawbacks, the present invention has developed a floor slab using an earthquake-resistant wall that can provide a flat ceiling surface with no protruding beams or small beams while ensuring sufficient support strength for the floor slab. It seeks to provide a supporting structure.

[Means for solving problems]

The technical means taken by the present invention to achieve the above object are as follows. That is, the floor slab support structure using earthquake-resistant walls of the present invention has a narrow vertical width between the earthquake-resistant walls that do not have a beam-shaped part for a girder at the upper end edge, and has a concave part that serves as a space for piping on the lower surface of the end. It is characterized in that a floor slab with a large number of ribs integrally molded is installed on the back surface with gaps of about the same width as the width of the ribs.

[Effect]

According to the above configuration, the weight of the floor slab is distributed and supported throughout the shear wall by the many ribs,
Stress concentration at the joints between each rib and the shear wall does not become so large.

Therefore, sufficient support strength is ensured even though a beam-shaped part for a girder is not formed at the upper end edge of the seismic wall.

In addition, instead of small beams placed at intervals of several meters, we installed multiple ribs at small intervals (gaps about the same as the width of the ribs). It is sufficient to use a beam that is much narrower than the beam structure, and the concave part formed on the bottom surface of the end of the rib provides space for piping, so even if the ceiling board is high, equipment piping in the attic can be easily accessed. There is no problem with this, and it is possible to have a flat ceiling surface with no protruding small beams or beam-shaped parts.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1... is a column, 2... is a large beam in the beam direction, and 3, 3 is a seismic wall provided between the columns 1, 1 in the beam direction. These seismic walls 3, 3 do not have a beam-shaped part for a girder like the conventional ones on the upper edge,
The wall thickness is uniform throughout the entire length. 4
... is a floor slab 5 installed between the earthquake-resistant walls 3, 3.
It is a rib with a narrow vertical width that is integrally molded on the back side of the . As shown in the figure, a large number of these ribs 4 are provided at intervals of about the same width as the width of the ribs 4. The vertical width of rib 4 is the span of the building,
Although it varies depending on the number of ribs, etc., for example, in a building with a span of 6 meters in the column direction and 11 meters in the beam direction, as in the conventional example described at the beginning, ribs 4... When provided at small intervals, the vertical width (beam width) of rib 4 is 250
It can be about mm. In addition, each of the ribs 4...
Recessed portions 4a, 4a are formed on the lower surface of both ends to provide space for the pipes 7, 7, and even if the ceiling plate 6 is placed as high as possible, there will be no problem with the equipment piping in the attic. This is taken into consideration. Incidentally, the recessed portions 4a, 4a may be provided only on one end side of the ribs 4.

FIG. 4 shows the schematic structure of the slab formwork used to construct the floor slab 5 with ribs 4, and posts 8.
For example, a batten angle 12
... etc. are arranged parallel to each other with a small pitch,
The ribbed floor slab described above is constructed by appropriately placing reinforcements 13 and pouring concrete on-site.

Incidentally, the shear walls 3, 3 may be made of cast-in-place concrete, or may be made of precast. If the shear walls 3, 3 are made of precast,
As shown in FIGS. 5A and 5B, a steel formwork 14 in which recesses 14a for forming the ribs 4 are formed by pressing a steel plate is attached to the side surfaces of the precast shear walls 3, 3. Bolted angle material 1
5... and then supported by posts 8... and after providing required reinforcement (not shown) in the formwork 14, concrete may be cast on site.

〔Effect of the invention〕

Since the present invention has the above-described configuration, the weight of the floor slab is distributed and supported over the entire earthquake-resistant wall by a large number of ribs, thereby reducing stress concentration at the joints between each rib and the earthquake-resistant wall. is not that large either.

Therefore, sufficient support strength is ensured even though a beam-shaped part for a girder is not formed at the upper end edge of the seismic wall.

In addition, instead of small beams placed at intervals of several meters, we installed multiple ribs at small intervals (gaps about the same as the width of the ribs). It is sufficient to use a beam that is much narrower than the beam structure, and the concave part formed on the bottom surface of the end of the rib provides space for piping, so even if the ceiling board is high, equipment piping in the attic can be easily accessed. It is possible to have a flat ceiling surface without any protruding beams or beam-shaped parts, and it is possible to increase the degree of freedom in the floor plan, expand the indoor space, and improve the aesthetic appearance.

[Brief explanation of drawings]

1 to 3 show an embodiment of a floor slab support structure using a shear wall according to the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line - in FIG.
The figure is a sectional view taken along the line -- in FIG. Figure 4 is a sectional view of the main part showing an example of construction of a ribbed floor slab, Figure 5
Figures A and B are a partially cross-sectional side view and a perspective view of the main part showing another embodiment of the present invention. 3... Earthquake-resistant wall, 4... Rib, 4a... Recessed part, 5... Floor slab.

Claims (1)

[Claims] 1 Between the seismic walls that do not have a beam-shaped part for a girder on the upper edge, there is a rib with a narrow vertical width on the back side, which has a concave part that serves as a space for piping on the lower side of the end, and a gap of the same width as the width of the rib. A support structure for a floor slab using an earthquake-resistant wall, characterized in that a plurality of integrally molded floor slabs are installed with the walls separated from each other.