JP7045306B2 - Building - Google Patents

Description

The present invention relates to a building in which the planar shape of the low-rise part is larger than that of the high-rise part constructed on the low-rise part.

A building (see, for example, Patent Document 1) is known in which the planar shape of the low-rise portion used for commercial purposes is larger than that of the high-rise portion used for residential purposes and the like built on it.

JP-A-2017-101516

In such a building, the weight of the low-rise portion having a relatively large planar shape is generally larger than the weight of the high-rise portion having a relatively small planar shape, and a weight difference occurs between the two. When the weight difference between the low-rise part and the high-rise part becomes large in this way, the seismic layer shear force coefficient in the high-rise part becomes large as compared with the case where the weight difference is small, so that the securing of an effective indoor space is sacrificed. Therefore, it may be necessary to increase the cross section of the column and beam in the high-rise part.

Further, in the high-rise part, the weight can be reduced to reduce the layer shear force coefficient, but since the thickness and specific gravity of the slab in the high-rise part are lowered, the heavy floor impact noise when used for residential purposes, etc. There is a risk that it will not be possible to clear the criteria of.
Further, when the weight difference between the low-rise part and the high-rise part becomes large, it becomes complicated to obtain the seismic force (layer shear force) acting in the horizontal direction on each floor, and labor is required for structural design.

In view of this situation, the main problem of the present invention is that in a building in which the planar shape of the low-rise part is larger than that of the high-rise part constructed on the low-rise part, the weight of the high-rise part is reduced while saving labor in the structural design. The point is to provide technology that can reduce the acting seismic force.

The first characteristic configuration of the present invention is a building in which the planar shape of the low-rise portion is larger than that of the high-rise portion constructed on the low-rise portion.
The surface density of the slab in the low-rise portion is set to be smaller than that in the slab in the high-rise portion, and the weight difference between the weight of each floor of the low-rise portion and the weight of each floor of the high-rise portion is reduced.

According to this configuration, the surface density of the high-rise slabs mainly used for residential purposes is maintained to a level that can meet the standards such as heavy floor impact noise, while the low-rise parts mainly used for commercial purposes. If the surface density of the slab is set smaller than that of the slab in the high-rise part, in addition to the reduction of the seismic force acting on each floor by reducing the building weight, the vibration characteristics at the boundary between the low-rise part and the high-rise part suddenly change. It is possible to suppress an increase in seismic force on the high-rise portion side due to the above, and for example, it is possible to secure an effective indoor section by making the cross-beam cross section as small as possible in the high-rise portion.
Furthermore, since the surface density (weight per unit flat area) of the slab constructed in the low-rise portion is set to be smaller than that of the slab constructed in the high-rise portion, the planar shape of the low-rise portion is constructed on it. Even if it is larger than the high-rise portion, the weight difference between the low-rise portion and the high-rise portion can be reduced. As a result, the seismic force acting in the horizontal direction on each layer can be easily obtained, and labor saving in the structural design can be achieved.
Therefore, according to the present invention, in a building in which the planar shape of the low-rise part is larger than that of the high-rise part constructed on the high-rise part, the seismic force acting without reducing the weight of the high-rise part while saving labor in the structural design. It is possible to provide a technique capable of reducing the problem.

The second characteristic configuration of the present invention is that the slab in the low-rise portion is made of lightweight concrete having a specific gravity smaller than that of the concrete constituting the slab in the high-rise portion.

According to this configuration, since the low-rise slab is made of lightweight concrete, the surface density of the low-rise slab is the same as that of the high-rise slab, while the thickness of the low-rise slab is the same as that of the high-rise slab. Can be set smaller than.

In the third characteristic configuration of the present invention, the thickness of the slab in the low-rise portion is set to be smaller than the thickness of the slab in the high-rise portion.
The arrangement pitch of the floor beams supporting the slabs in the low-rise portion is set to be narrower than that in the floor beams supporting the slabs in the high-rise portion.

According to this configuration, the arrangement pitch of the floor beams in the low-rise part is set narrower than that in the high-rise part, so there is a concern that the strength will decrease as the surface density decreases due to the thinning of the slab in the low-rise part. Even if this is the case, the floor beams arranged at a narrow arrangement pitch can support the slab in the low-rise portion to compensate for the lack of strength of the slab in the low-rise portion.

Vertical sectional view of the building of the first embodiment Vertical sectional view of the building of the second embodiment

[First Embodiment]
A first embodiment of a building according to the present invention will be described with reference to FIG.
The building 10 of the first embodiment shown in FIG. 1 is built on a low-rise portion 10L from the first floor portion to the third floor portion mainly used for commercial purposes and the low-rise portion 10L, and is mainly an apartment house. It is configured as a reinforced concrete building having a high-rise part 10H from the 4th floor part to the 7th floor part used for the purpose. The number of floors and uses of the low-rise portion 10L, the high-rise portion 10H, and the building 10 are not particularly limited.
Further, in the following description, the slab on the boundary with the upper floor portion on each floor constituting the lower floor portion 10L is referred to as the slab 11L on the lower floor portion 10L, and is on the boundary with the upper floor portion on each floor constituting the high-rise portion 10H. The slab is called the slab 11H of the high-rise part 10H.

The building 10 is configured such that the planar shape of the low-rise portion 10L is larger than that of the high-rise portion 10H constructed on the low-rise portion 10L. In such a building 10, in general, the weight of each floor of the low-rise portion 10L having a relatively large planar shape tends to be larger than the weight of each floor of the high-rise portion 10H having a relatively small planar shape. When the weight difference between the low-rise portion 10L and the high-rise portion 10H becomes large, the seismic layer shear force coefficient in the high-rise portion 10H becomes larger than in the case where the weight difference is small. It is necessary to take measures such as increasing the size. Further, when the weight difference becomes large, it becomes complicated to obtain the seismic force (layer shear force) acting in the horizontal direction on each floor of the building 10, and labor is required for the structural design.
Further, in order to reduce the seismic force acting on the high-rise portion 10H, when the weight of the high-rise portion 10H is reduced to reduce the layer shear force coefficient, the thickness and specific gravity of the slab 11H of the high-rise portion 10H are reduced. Therefore, there is a risk that it will not be possible to meet the standards for heavy floor impact noise when used for residential purposes.

Therefore, in the building 10 of the present embodiment, the surface density of the slab 11L of the low-rise portion 10L having a relatively large planar shape is set to be smaller than that of the slab 11H of the high-rise portion 10H having a relatively small planar shape. Therefore, the weight difference between the low-rise portion 10L and the high-rise portion 10H as described above is reduced. In the present application, the surface density of the slab is a value obtained by dividing the weight of the slab by the flat area (projected area in a plan view) of the slab.
Further, regarding the magnitude of the weight difference between the low-rise portion 10L and the high-rise portion 10H, it is preferable that the weight difference is substantially eliminated and the weight of each floor of the low-rise portion 10L and the weight of each floor of the high-rise portion 10H are substantially equal to each other. However, it is preferable that the weight difference is reduced within an allowable range in terms of seismic design.

The surface density of the slab 11H of the high-rise portion 10H is maintained to the extent that the standard such as heavy floor impact sound can be cleared, and the surface density of the slab 11L of the low-rise portion 10L is the surface density of the high-rise portion 10H while maintaining that state. It is set smaller than the slab 11H. As a result, the weight of the building 10 is reduced, and the seismic force acting on each floor is reduced. In addition, an increase in seismic force on the high-rise portion 10H side due to a sudden change in vibration characteristics at the boundary portion between the low-rise portion 10L and the high-rise portion 10H is suppressed. If the increase in the seismic force in the high-rise portion 10H is suppressed in this way, for example, the column-beam cross section can be made as small as possible in the high-rise portion 10H to secure an effective indoor section.

The surface density of the slab 11L of the low-rise portion 10L is set to be smaller than that of the slab 11H of the high-rise portion 10H. Therefore, even when the planar shape of the low-rise portion 10L is larger than that of the high-rise portion 10H constructed on the low-rise portion 10L as in the building 10 of the present embodiment, the weight difference between the low-rise portion 10L and the high-rise portion 10H becomes small. Therefore, it is possible to simplify the calculation of the seismic force acting in the horizontal direction for each layer and save manpower in the structural design.

Further, in the building 10 of the present embodiment, as a specific means for setting the surface density of the slab 11L of the low-rise portion 10L to be smaller than that of the slab 11H of the high-rise portion 10H, the slab 11L of the low-rise portion 10L is the high-rise portion 10H. It is made of lightweight concrete having a smaller specific gravity than the ordinary concrete constituting the slab 11H.
With this configuration, the thickness of the slab 11L of the low-rise portion 10L is equal to the thickness of the slab 11H of the high-rise portion 10H, but the surface density of the slab 11L of the low-rise portion 10L is higher than the surface density of the slab 11H of the high-rise portion 10H. Is also set small.

[Second Embodiment]
A second embodiment of the building according to the present invention will be described with reference to FIG.
The description of the same configuration as that of the first embodiment may be omitted.
The building 20 of the second embodiment shown in FIG. 2 is a reinforced concrete building having a low-rise portion 20L having a relatively large planar shape and a high-rise portion 20H having a relatively small planar shape, similarly to the first embodiment. Further, the surface density of the slab 21L of the low-rise portion 20L is set to be smaller than that of the slab 21H of the high-rise portion 20H, and the weight difference between the low-rise portion 20L and the high-rise portion 20H is reduced.

Further, in the building 20 of the present embodiment, as a specific means for setting the surface density of the slab 21L of the low-rise portion 20L to be smaller than that of the slab 21H of the high-rise portion 20H, the thickness of the slab 21L of the low-rise portion 20L is increased. , It is set smaller than the thickness of the slab 21H of the high-rise portion 20H.
Further, in order to avoid insufficient strength due to the thinning of the slab 21L of the low-rise portion 20L, the arrangement pitch of the floor beam 22L supporting the slab 21L of the low-rise portion 20L is such that the floor beam 22H supporting the slab 21H of the high-rise portion 20H is provided. It is set narrower than the placement pitch of. Specifically, in FIG. 2 showing the present embodiment, in the low-rise portion 20L, two floor beams 22L are distributed and arranged in one span between columns at a relatively narrow arrangement pitch, while in the high-rise portion 20H. One floor beam 22H is arranged in one span between columns at a relatively wide arrangement pitch.
Regarding the number and arrangement pitch of the floor beams 22L in the low-rise portion 20L and the arrangement number and arrangement pitch of the beam beams 22H in the high-rise portion 20H, the arrangement pitch of the floor beams 22L in the low-rise portion 20L. Can be appropriately changed under the condition that is narrower than the arrangement pitch of the beam beam 22H in the high-rise portion 20H, and for example, the beam beam 22H in the high-rise portion 20H can be omitted. Further, even if the arrangement pitch of the floor beam 22L of the low-rise portion 20L is set to the same as the arrangement pitch of the floor beam 22H of the high-rise portion 20H within the range where there is no problem in the strength of the slab 21L of the low-rise portion 20L. I do not care.

[Another Embodiment]
Other embodiments of the present invention will be described. It should be noted that the configurations of the respective embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, in the buildings 10 and 20, the low-rise parts 10L and 20L and the high-rise parts 10H and 20H are made of reinforced concrete, but the present invention is not limited to the structure. For example, the low-rise parts 10L and 20L may be made of steel-framed reinforced concrete and the high-rise parts 10H and 20H may be made of reinforced concrete, and the low-rise parts 10L and 20L and the high-rise parts 10H and 20H may have different structures.

(2) As a specific means for setting the surface density of the slab 21L of the low-rise portion 20L to be smaller than that of the slab 21H of the high-rise portion 20H, in the first embodiment, the ordinary concrete constituting the slab 11H of the high-rise portion 10H. In the second embodiment, the thickness of the slab 21L of the low-rise portion 20L is larger than the thickness of the slab 21H of the high-rise portion 20H. However, the present invention is not limited to the configuration thereof, and for example, a configuration in which these means are combined may be adopted.

10 Building 10H High-rise 10L Low-rise 11H Slab 11L Slab 20 Building 20H High-rise 20L Low-rise 21H Slab 21L Slab 22L Floor beam

Claims (3)

The plan shape of the low-rise part is larger than that of the high-rise part built on it.
A building in which the surface density of the slab in the low-rise portion is set to be smaller than that in the slab in the high-rise portion, and the weight difference between the weight of each floor in the low-rise portion and the weight of each floor in the high-rise portion is reduced. The building according to claim 1, wherein the low-rise slab is made of lightweight concrete having a specific gravity smaller than that of the concrete constituting the high-rise slab. The thickness of the slab in the low-rise portion is set to be smaller than the thickness of the slab in the high-rise portion.
The building according to claim 1 or 2, wherein the arrangement pitch of the floor beams supporting the slabs in the low-rise portion is set to be narrower than that in the floor beams supporting the slabs in the high-rise portion.

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