JP2021014735A - Earthquake-resistant building structure - Google Patents

Abstract

To provide an earthquake-resistant building structure capable of preventing intrusion of rainwater caused by damage of a frame member caused by rolling of an adjacent concrete block.SOLUTION: In an earthquake-resistant building structure 5, an earthquake-resistant slit member 7 is interposed between adjacent concrete masses 1,3; the earthquake-resistant slit member has a frame member 13 which is fitted to and inserted into each side part on both sides in the width direction of the earthquake-resistant slit member and holds the earthquake-resistant slit member when placing concrete; among the frame members, the frame member that is placed at least on the external side of the concrete building is provided with a waterproof member 25 to fill the space between the external surface of the side part in the width direction of the earthquake-resistant slit member and the internal surface of the frame member facing the external surface.SELECTED DRAWING: Figure 2

Description

The present invention relates to seismic building structures that prevent damage to concrete buildings due to rolling vibrations such as earthquakes.

In a concrete building, a seismic slit member (for example, polystyrene) formed of a highly flexible member between adjacent concrete blocks such as columns and walls in order to prevent damage to the concrete building due to rolling vibration such as an earthquake. A seismic building structure that can absorb the displacement and deformation (shake) of the walls and columns caused by rolling during an earthquake will be provided through the foam.

The seismic slit members used in such seismic building structures are interposed between columns and walls by utilizing the process of placing concrete in concrete buildings.
In many cases, during the concrete placing process, a frame member made of synthetic resin is fitted between both sides of the seismic slit member in the width direction and the ridges provided on the inner surface of the concrete casting formwork. After holding the seismic slit member at a predetermined position in the formwork, concrete is placed so that the seismic slit member is interposed between the pillar portion and the wall portion composed of the concrete block (see Patent Document 1). ).

Patent No. 3921122

Recently, it is not uncommon for earthquakes to occur on a scale and frequency that exceeds expectations.
By the way, depending on the scale of the earthquake, there is a risk that the rolling vibration of the earthquake may cause rolling (swing) of the wall portion and the pillar portion that exceeds the assumption of the seismic slit member.
In such a case, the frame member holding the side portion of the seismic slit member may not be able to withstand the stress caused by rolling and may be damaged.

In particular, when the frame member placed on the outside of the concrete building is damaged, rainwater from the outside (outside air) of the concrete building invades the inside through the damaged part of the frame material and affects the concrete block. There is a concern that it may be given or rainwater may enter the concrete building (rain leakage).
Therefore, an object of the present invention is to provide an earthquake-resistant building structure capable of preventing rainwater from entering due to damage to a frame member caused by rolling of an adjacent concrete block.

The aspect of the seismic building structure according to the present invention is a seismic building structure in which a seismic slit member is interposed between adjacent concrete blocks in a concrete building, and the seismic slit member is the width of the seismic slit member. It has a frame member that is fitted and inserted into each side of both sides of the direction and holds the seismic slit member when placing concrete, and among the frame members, at least the frame member arranged on the outer side of the concrete building has a seismic slit. A waterproof member is provided between the outer surface of the widthwise side portion of the member and the inner surface of the frame member facing the outer surface so as to fill the space (claim 1).

Preferably, the waterproof member is composed of a waterproof sheet and is interposed between the end surface of the side portion of the seismic slit member and the inner surface of the holding frame facing the same end surface. As a result, a simple structure is sufficient (claim 2).
Preferably, the bar member extends through the seismic slit member and each end is connected to the concrete lumps on both sides of the seismic slit member, and the concrete lump is halfway inserted into one end of the bar member. Applies to seismic building structures with sack members embedded in concrete. As a result, the seismic performance is further improved (claim 3).

According to the present invention, when the seismic slit member between adjacent concrete blocks is greatly deformed due to the rolling vibration of the earthquake and the frame member on the side of the seismic slit member is damaged, rainwater from the outside of the concrete building Invades the inside of the concrete block through the damaged part of the frame member. At this time, since a waterproof member is provided between the outer surface of the side portion of the seismic slit member and the inner surface of the frame member facing the outer surface, it is possible to prevent rainwater from entering from the damaged portion of the frame member.

Therefore, it is possible to prevent rainwater from entering due to damage to the frame member caused by rolling of the adjacent concrete block (claim 1).
Moreover, if a waterproof sheet is used as the waterproof member and the structure is interposed between the side end surface of the seismic slit member and the inner surface of the frame member, the waterproof construction is performed on the side portion of the seismic slit member and the inner surface of the frame member. It is only necessary to insert a waterproof sheet between the two, and the construction is easy (claim 2).

In addition, the seismic slit member, the bar member extending through the seismic slit member and each end being connected to the concrete lumps on both sides of the seismic slit member, and one end of the bar member are halfway inserted. By combining a structure having a sack member embedded in a concrete block and a waterproof structure using a waterproof member, seismic performance can be further improved (claim 3).

The perspective view explaining the seismic building structure which becomes the aspect which concerns on 1st Embodiment of this invention. (A) is a plan sectional view of the seismic slit member and the frame member in FIG. 1 (a) along the line AA, and (b) is an enlarged plan sectional view of a main part. An exploded perspective view of each part of the seismic slit member, frame member, and waterproof member (waterproof sheet). A plan sectional view illustrating the lateral vibration absorption caused by the seismic slit member. The plan sectional view explaining the seismic building structure which becomes the main part of the aspect which concerns on 2nd Embodiment of this invention. A plan sectional view illustrating the roll absorption caused by the bar member and the sack member.

Hereinafter, the present invention will be described based on the first embodiment shown in FIGS. 1 to 4.
FIG. 1A shows a part of a concrete building, for example, a concrete pillar portion 1 (corresponding to the concrete block of the present application) which is an outer wall of the concrete building, and a concrete wall portion 3 connected to the pillar portion 1. (Part: Corresponds to the concrete block of the present application)).
A seismic building structure 5 is used for the outer wall of this concrete building. The seismic building structure 5 is formed by interposing a seismic slit member 7 called a vertical slit between the pillar 1 and the wall 3 in the height direction of the pillar 1 and the wall 3, for example. .. Incidentally, as the seismic slit member 7, a member having high flexibility, for example, a member formed of polystyrene foam in a strip shape or the like is used.

The seismic slit member 7 is interposed between the pillar portion 1 and the wall portion 3 by utilizing the process of placing concrete. Therefore, a pair of frame members 13 for supporting the seismic slit member 7 on the inner surface of the form 11 (consisting of the outer frame 11a and the inner frame 11b) are provided on the side portions of the seismic slit member 7 on both sides in the width direction.
Each of the frame members 13 is made of a hard synthetic resin material as shown in FIGS. 2 (a) and 2 (b) and FIG. 3, for example. Specifically, the frame member 13 is formed on the inner frame portion 13a having a U-shaped cross section that can be fitted into the side portion of the seismic slit member 7, and on the inner surface of the outer frame 11a and the inner frame 11b (both are the formwork 11). It is composed of a long member in which the back portions of the ridge portion 11c and the back portions of the U-shaped outer frame portion 13b having an insertable cross section are integrally butted against each other.

Here, the method of interposing the seismic slit member 7 will be described. For example, when concrete is placed as shown in FIG. 2B, the outer frame portion 13b of each frame member 13 and the ridge portion of the outer frame 11a 11c and the ridge portion 11c of the inner frame 11b are fitted and inserted, and each frame member 13 is supported by the outer frame 11a and the inner frame 11b. Then, the inner frame portion 13a of each frame member 13 and each side portion (both sides in the width direction) of the seismic slit member 7 are fitted and inserted to position (hold) the seismic slit member 7 at a predetermined position in the form 11. ..

After that, by placing concrete into the formwork 11 partitioned by the seismic slit member 7, the seismic slit member 7 forms a concrete block forming the pillar portion 1 and a concrete forming the wall portion 3 at predetermined positions. It is sandwiched between the mass. After placing the concrete, the outer frame 11a and the inner frame 11b are removed, and the recesses (recesses) of the traces of the ridges 11c are covered with a backup material 19a, a sealing material 19b, or the like.

In this embodiment, for example, in order to ensure waterproofness on the outside side of the concrete building, only the outside side of the seismic slit member 7 is sealed. Further, in order to improve the fire resistance on the inner side of the concrete building, a fire resistant member 21 is provided between the inner side portion of the seismic slit member 7 and the inner frame portion 13a.
Among the frame members 13, the frame member 13 arranged on the outer side of the concrete building is provided with a waterproof member, for example, a waterproof sheet 25, which helps when the frame member 13 is damaged.

Specifically, the waterproof sheet 25 is composed of, for example, a strip-shaped sheet made of rubber or synthetic resin having a thickness of about 1 mm as shown in FIG. As shown in FIG. 2B, the waterproof sheet 25 has an outer surface of a side portion arranged on the outer side of the concrete building, for example, an end surface 7a and an inner frame portion 13a (frame member 13) facing the same end surface 7a. ) Is sandwiched between the bottom surface 13c and the bottom surface 13c so as to fill the space.

That is, the waterproof sheet 25 is interposed between the outer surface of the side portion of the seismic slit member 7 and the inner surface of the frame member 13 facing the side portion.
Of course, the waterproof sheet 25 includes the end face 7a of the seismic slit member 7 and the side surfaces 7b on both sides thereof, the bottom surface 13c of the inner frame portion 13a (frame member 13) facing the end faces 7a and the side surface 7b, and the inner side surfaces 13d on both sides thereof. It may be intervened between the two.

With this waterproof sheet 25, even if the bottom surface 13c of the frame member 13 on the outer side of the seismic slit member 7 is damaged by the rolling motion of the wall portion 3 (rolling vibration of an earthquake), the waterproof sheet 25 can be used from the damaged portion. It has a structure that prevents the intrusion of rainwater. That is, the waterproof sheet 25 cuts off the intrusion route of rainwater and prevents rainwater from invading from the outside to the inside of the concrete building.
Next, the operation of the seismic building structure 5 will be described with reference to FIGS. 2 and 4.

For example, suppose an earthquake occurs and the rolling vibration of the earthquake is transmitted to the outer wall of a concrete building. Then, for example, the adjacent pillar portion 1 and the wall portion 3 roll sideways. At this time, the pillar portion 1 and the wall portion 3 swing in the direction of approaching or separating (displacement, deformation) due to the applied stress.
At this time, when the pillar portion 1 and the wall portion 3 are separated from each other, the seismic slit member 7 is deformed in the extending direction to absorb rolling (not shown). On the other hand, when the column portion 1 and the wall portion 3 approach each other, the seismic slit member 7 deforms in the compression direction as shown in FIGS. 4A and 4B, and absorbs the rolling motion received by the concrete building. To do. The frame member 13 is also displaced and deformed in accordance with the lateral vibration.

Here, for example, it is assumed that the rolling vibration of an earthquake of a scale exceeding an assumption is transmitted to the outer wall of a concrete building. At this time, the seismic slit member 7 is forced to be excessively displaced or deformed due to the stress caused by the rolling of the outer wall.
The frame member 13 may be damaged by the excessive rolling of the outer wall at this time.
For example, when damage occurs on the bottom surface 13c of the outer frame portion 13b as indicated by the “α” point in FIGS. 2A and 2B, rainwater flows inward from the outer wall of the concrete building through the damaged portion. invade. This invading rainwater affects the outer wall and causes rain leaks.

Here, a waterproof sheet 25 is interposed between the side portion of the seismic slit member 7 and the frame member 13 into which the side portion fits. That is, even if the bottom surface 13c of the frame member 13 is damaged by the prior measures of installing the waterproof sheet 25, the damaged portion is closed by the waterproof sheet 25, so that the rainwater intrusion route is cut off.
Therefore, by interposing the waterproof sheet 25 between the side portion of the seismic slit member 7 and the frame member 13, the influence of the concrete lump and the intrusion of rainwater due to the damage of the frame member 13 caused by the rolling can be prevented. be able to.

Moreover, since the waterproof sheet 25 is interposed between the end surface of the side portion of the seismic slit member 7 and the bottom surface 13c of the frame member 13 to prevent rainwater from entering, waterproofing is easy.
5 and 6 show a second embodiment of the present invention.
In this embodiment, in addition to the seismic slit member 7, a bar member 31 is used to prevent the wall portion 3 of the concrete building from swaying, and a sack member 33 that releases the restriction by the bar member 31 is used in combination. Is combined with the waterproof sheet 25 (waterproof member) according to the first embodiment of the present invention.

That is, in the concrete building, as shown in FIG. 5, the concrete building extends through the seismic slit member 7 so that the rolling motion of the earthquake can be absorbed, and each end of the pillars 1 on both sides sandwiching the seismic slit member 7. And the bar member 31 (consisting of, for example, reinforcing bars) connected to the wall portion 3 (both corresponding to the concrete block of the present application) and the end portion on the wall portion 3 side which is one end of the bar member 31 are fitted halfway. There is a seismic building structure 35 using a sack member 33 that has been inserted and embedded in the wall portion 3. The sack member 33 is made of, for example, a synthetic resin member, and is slidably covered with the bar member 31.

In the seismic building structure 35, not only the runout of the wall portion 3 is suppressed by the bar member 31, but also when the wall portion 3 and the pillar portion 1 are close to each other as shown in FIGS. 6A and 6B. Is that the bar member 31 is inserted into the sack member 33 with resistance, so that the stress of the runout of the outer wall is suppressed.
By combining this bar member 31, the seismic slit member 7, and the waterproof sheet 25, the seismic building structure 35 can absorb a large amount of stress while suppressing damage to the concrete building, so that the seismic performance is further improved. Can be improved. It's quite effective.

However, in FIGS. 5 and 6, the same parts as those in the first embodiment described above are designated by the same reference numerals, and the description thereof is omitted.
The present invention is not limited to the above-described embodiment, and various variations may be made within a range that does not deviate from the gist of the present invention. For example, in the above-described embodiment, the waterproof sheet (waterproof member) is applied to only one side of the seismic slit member, but the present invention is not limited to this, and the waterproof sheet (waterproof member) is applied to both sides of the seismic slit member. You may.

Further, in the above-described embodiment, an example in which a seismic slit member is provided between the column portion and the wall portion has been given, but the present invention is not limited to this, and for example, a seismic building structure in which a seismic slit member is provided between the beam member and the wall portion. The present invention may be applied as long as it can be applied to a body and has a structure in which seismic slit members are provided between adjacent concrete blocks.

1, 3 Pillars, walls (concrete block)
5, 35 Seismic building structure 7 Seismic slit member 13 Frame member 13a Inner frame 13b Outer frame 25 Tarpaulin (waterproof member)
31 Bar member 33 Sack member

Claims (3)

It is a seismic building structure in which seismic slit members are interposed between adjacent concrete blocks in a concrete building.
The seismic slit member has a frame member that is fitted and inserted into each side portion of the seismic slit member on both sides in the width direction and holds the seismic slit member when concrete is placed.
Among the frame members, at least the frame member arranged on the outer side of the concrete building has the same space between the outer surface of the widthwise side portion of the seismic slit member and the inner surface of the frame member facing the outer surface. An earthquake-resistant building structure characterized by the provision of waterproof members to fill the gaps. The waterproof member is characterized by having a waterproof sheet interposed between an end surface of one side of the seismic slit member in the width direction and an inner surface of a holding frame facing the same end surface. The seismic building structure according to claim 1. The concrete building extends through the seismic slit member and is halfway inserted into a bar member whose ends are connected to concrete lumps on both sides of the seismic slit member and one end of the bar member. The seismic building structure according to claim 1, further comprising a sack member embedded in a concrete block.

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