JP2000129952A - Earthquake resistant wall, and execution method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake resistant wall which is capable of shortening the execution period, reducing the construction cost, and providing the energy absorbing capacity in a wall itself, and its execution method. SOLUTION: An earthquake resistant wall 20 comprising an upper wall part which is provided between upper and lower beams 12, 14, has a recessed part 20d on an upper end, and is joined with the upper beam 12, a lower wall part 20b which has a-recessed part 20d on a lower end and is joined with the lower beam 14, and a wallcolumn part 20c which is formed between the lower wall part 20b and the upper wall part 20a and lower in strength than the wall parts is integratedly formed of precast material. Reduction in strength of the wall- column part 20c is effected by reducing the wall thickness, or splitting the beams 12, 14 in the longitudinal direction. In the earthquake resistant wall 20, a fixing member projecting at the position corresponding to the recessed part 20 in the upper and lower beams 12, 14 is fixed to the recessed parts, and joined with the upper and lower beams 12, 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be easily applied to upper and lower beams, shortening the construction period and cost, and effectively reinforcing the frame against external forces such as earthquakes. TECHNICAL FIELD The present invention relates to an earthquake-resistant wall and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, when constructing an earthquake-resistant wall on a frame surrounded by columns and beams, formwork is built on both sides of a wall bar connected to an anchor attached to the column or beam, Next, wall concrete is cast into the interior of the building, and after the wall concrete has hardened, the formwork is finally dismantled and removed.

On the other hand, Japanese Patent Application Laid-Open No. 3-69553 (I
nt.Cl.E04B 2/02) is also known. In this method, a concrete block having a hole for inserting a reinforcing bar connected to the anchor is precast-formed in advance, and this is piled up in a frame to construct an earthquake-resistant wall. Concretely, while stacking concrete blocks, reinforcing bars are installed in the holes that are connected to each other between the concrete blocks, and then grout is filled into all the holes so that they are completely filled. By doing so, the entire concrete block is integrated into a seismic wall.

[0004]

However, of the conventional methods of constructing a shear wall, the former requires a large amount of materials because it uses a formwork, and is often used for assembling, dismantling and removing the formwork. Work was required. In addition, since the entire earthquake-resistant wall is constructed of cast-in-place concrete, there is a problem of noise generated by the pump truck when the concrete is cast, restricting work on holidays and at night, and the construction period has been prolonged. Furthermore, since the entire earthquake-resistant wall is constructed of cast-in-place concrete, it takes a considerable period of time to cure the cast-in-place concrete, and from this aspect, there is a problem that the construction period is prolonged.

On the other hand, in the latter construction method, a large amount of grout is filled over the entire hole of a concrete block provided with reinforcing bars, but this grout is relatively expensive and requires high construction costs. There was a problem.

Further, the conventional earthquake-resistant wall is intended to enhance the rigidity of the building frame to improve the earthquake-resistant performance. However, conventionally, it has been considered only as a wall, and no consideration has been given to enhancing the energy absorbing ability. I didn't.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an earthquake-resistant wall capable of shortening the construction period, reducing the construction cost, and providing the wall itself with an energy absorbing ability, and a construction method thereof.

[0008]

According to a first aspect of the present invention, there is provided an earthquake-resistant wall provided between upper and lower beams, the upper end of which has a concave portion for fixing a fixing member projecting from the upper beam. An upper wall portion joined to the upper beam, a lower wall portion joined to the lower beam having a concave portion at the lower end for fixing a fixing member projecting from the lower beam, The wall pillar portion formed between the lower wall portion and the upper wall portion is integrally formed by precasting, and the strength of the wall pillar portion is set to be smaller than those of the upper wall portion and the lower wall portion. And

According to a second aspect of the present invention, the wall thickness of the wall pillar portion is formed thinner than the upper wall portion and the lower wall portion.

According to a third aspect of the present invention, the earthquake-resistant wall is characterized in that the wall column portion is formed by being divided in the longitudinal direction of the beam.

According to a fourth aspect of the present invention, there is provided a method for constructing an earthquake-resistant wall provided between upper and lower beams, wherein the upper portion has a concave portion, and the upper wall portion joined to the upper beam and the lower portion have a concave portion. A precast cast wall having a lower wall portion to be joined to the lower beam, and a wall column portion formed between the lower wall portion and the upper wall portion and having a lower strength than these wall portions. In addition to being integrally formed, a fixing member is projected from the upper and lower beams corresponding to the concave portion, and the fixing member is fixed to the concave portion so that the earthquake-resistant wall is joined to the upper and lower beams. Features.

The operation of the invention described in the above claim will be described. In the earthquake-resistant wall according to the present invention, it is formed by precasting, and concrete is cast into a formwork on site as in the prior art. Unlike building a shear-resistant wall, work materials for building a formwork are not required, and work such as assembling and dismantling of a formwork is not required. . Also, the curing period of the cast concrete is not required, and the construction period can be shortened. In addition, since it is made of precast, which can be produced in a factory, it is possible to eliminate the work of placing concrete on site and solve the noise problem caused by the use of pump trucks. The construction period can be shortened.

On the other hand, even when compared with the conventional construction method using a concrete block, only the recesses at the upper and lower ends of the earthquake-resistant wall are fixed portions for joining the earthquake-resistant wall to the upper and lower beams, and therefore the entire hole of the concrete block is formed. The amount of the grout material used can be reduced as compared with the case where the grout material is filled over the entire area, and the cost can be reduced.

The earthquake-resistant wall is formed integrally with an upper wall portion, a lower wall portion, and a wall pillar portion formed between the lower wall portion and the upper wall portion. Is set smaller than these upper and lower walls, and when horizontal external force such as an earthquake is applied to the frame, the shear stress is concentrated on The wall column portion yields early, and external energy acting on the frame can be absorbed by the wall column portion. In particular, when the upper beam is horizontally displaced relative to the lower beam due to the input of a horizontal external force, the upper and lower ends of the wall column portions connected to these beams via the upper wall portion and the lower wall portion. Has the same displacement, but the height of the wall column is lower than the height between the upper and lower beams, so the distortion generated in the wall column is larger than the distortion between the upper and lower beams. Thereby, the wall column portion yields earlier than the frame and absorbs the external force energy, so that damage to the frame can be reliably prevented.

According to a second aspect of the present invention, the wall thickness of the wall pillar portion is formed thinner than the upper wall portion and the lower wall portion. In addition to lowering the strength than the lower and lower wall portions, the amount of concrete forming the earthquake-resistant wall can be reduced.

According to a third aspect of the present invention, the wall column is formed by dividing the wall column in the longitudinal direction of the beam, and the proof strength of the wall column is arbitrarily and freely determined according to the number of divisions and the width at the time of division. And it is possible to form an earthquake-resistant wall provided with a wall column having a desired energy absorption performance.

According to a fourth aspect of the present invention, there is provided a method for constructing an earthquake-resistant wall, wherein fixing members are protruded from upper and lower beams corresponding to the concave portions of the precast earthquake-resistant wall, and the fixing members are fixed to the concave portions. Are joined to the upper and lower beams, so that, unlike the case of the earthquake-resistant wall of claim 1, unlike the case of constructing an earthquake-resistant wall at the site, the material for building in the formwork is not required, Eliminating the work of building and dismantling the formwork is no longer necessary, and labor savings can be achieved in building the earthquake-resistant wall. Also, the curing period of the cast concrete is not required, and the construction period can be shortened. Furthermore, since the precast earthquake-resistant wall which can be manufactured in the factory is used, the problem of noise caused by the use of the pump truck can be solved, and the work schedule is not limited, thereby shortening the construction period.

On the other hand, even when compared with the conventional method using a concrete block, only the recesses at the upper and lower ends of the earthquake-resistant wall are used for fixing the earthquake-resistant wall to the upper and lower beams, thereby reducing the amount of grout material used. Can reduce the cost of construction.

Further, even if the earthquake-resistant wall is destroyed, it is possible to replace it with a new earthquake-resistant wall by a simple operation by removing the damaged earthquake-resistant wall by pulling out the anchored portion by the grout material. The seismic function can be restored.

[0020]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the earthquake-resistant wall 20 according to the present invention is provided between a pair of columns 10, 10 provided at an interval from each other, and between the upper end and lower end of the columns 10, 10. A space is provided between the pillars 10 and 10 in a frame 18 composed of the pair of upper and lower beams 12 and 14 thus formed.
2, 14 are provided.

The earthquake-resistant wall 20 has an upper wall portion 20a and a lower wall portion 20b, which are relatively low in height, and a wall column portion formed between the lower wall portion 20b and the upper wall portion 20a. 20c, and these parts are integrally formed by precasting. This earthquake-resistant wall 2
On both sides in the width direction of 0, concave portions 20d are formed at the upper end of the upper wall portion 20a and the lower end of the lower wall portion 20b so as to open toward the lower surface of the upper beam 12 and the upper surface of the lower beam 14, respectively. In the illustrated example, two of these recesses 20d are provided in the upper wall portion 20a and the lower wall portion 20b, respectively.
These wall portions are formed as grooves penetrating in the wall thickness direction.

The upper and lower recesses 20d, 20d, 20
An anchor 16 is inserted into each of the lower and upper beams 12 and 20d so as to reach the inside of the concave portion 20d from a position corresponding to the concave portions 20d, 20d, 20d and 20d on the lower surface of the upper beam 12 and the upper surface of the lower beam 14. Together with these anchors 1
The grout material is filled with 6 inserted. In this manner, the anchor 16 is
And the upper wall portion 20a and the lower wall portion 20b of the earthquake-resistant wall 20 are joined to the upper and lower beams 12, 14, whereby the earthquake-resistant wall 20 is constructed between the upper and lower beams.

In particular, as shown in the figure, a wall column portion 20c sandwiched between an upper wall portion 20a and a lower wall portion 20b formed with substantially equal wall thicknesses has an upper wall portion 20a formed with a stepped portion. The lower wall portion 20b has a smaller wall thickness than the upper wall portion 20a and the lower wall portion 20b, and has a lower strength than the upper and lower beams 12, 14. In the illustrated example, the wall column portion 20c is
Although the upper wall portion 20a and the lower wall portion 20b are formed at the center position in the wall thickness direction thereof, they may be formed so as to be displaced in any of the wall thickness directions.
The wall surface of 0c may be formed flush with either one of the upper wall portion 20a and the lower wall portion 20b. In this case, when the earthquake-resistant wall 20 is precast-molded,
The side to be flush can be formed in a series of formwork, and the productivity can be improved. In the illustrated example, a stepped portion is formed, but between the upper wall portion 20a and the lower wall portion 20b and the wall pillar portion 20c, the upper wall portion 20a and the lower wall portion 20b are formed.
May be formed with an inclined surface or a curved surface whose wall thickness is gradually reduced.

The construction method of the earthquake-resistant wall 20 will be described. First, the above-described earthquake-resistant wall 20 is formed by precasting in a factory or the like, and is transported to the site. On the other hand, at the site, an anchor 16 is provided on the lower surface of the upper beam 12 and the upper surface of the lower beam 14 so as to protrude into the frame 18 from the recesses 20 d, 20 d, 20 d 20 d of the earthquake-resistant wall 20.

Next, the earthquake-resistant wall 20 is carried into the frame 18, and the earthquake-resistant wall 20 is installed between the upper beam 12 and the lower beam 14 by aligning the positions of the anchor 16 and the recess 20d. Then
Although not shown, the upper wall portion 20a and the lower wall portion 2
On the front and back surfaces of 0b, a blocking plate for closing the recess 20d from both sides in the wall thickness direction is attached. Then, the recess 20d surrounded by the closing plate
Is filled with a grout material, and the anchor is fixed in the concave portion 20d by hardening of the grout material, and the earthquake-resistant wall 20 is joined to the upper beam 12 and the lower beam 14. At this time, the gap between the upper edge of the earthquake-resistant wall 20 and the lower surface of the upper beam 12 and the gap between the lower edge of the earthquake-resistant wall 20 and the upper surface of the lower beam 14 are further filled with a grout material, and It is preferable that the joints 12 and 14 be more firmly joined. When the grout hardens, the blocking plate is removed. Thereby, the installation work of the earthquake-resistant wall 20 can be completed.

As described above, in the earthquake-resistant wall of the present embodiment and the method for constructing the same, the earthquake-resistant wall 20 is formed by pre-casting. Unlike building the wall 20,
Work materials for building the formwork are not required, and work such as assembling and dismantling of the formwork is not required, so that labor for constructing the earthquake-resistant wall 20 can be saved. Also, the curing period of the cast concrete is not required, and the construction period can be shortened. Furthermore, since it is made of precast, which can be produced in a factory, it is possible to eliminate the work of placing concrete on site and solve the noise problem caused by the use of a pump truck. Can be shortened.

On the other hand, even when compared with the conventional method using a concrete block, the anchoring portions for joining the earthquake-resistant wall 20 to the upper and lower beams 12 and 14 are provided at the upper and lower recesses 2 at the upper and lower ends of the earthquake-resistant wall 20.
Since only 0d, 20d, 20d, and 20d are used, the amount of grout material used can be reduced as compared with the case where the grout material is filled over the entire hole of the concrete block, and the cost can be reduced.

The earthquake-resistant wall 20 is composed of an upper wall portion 20a, a lower wall portion 20b, a lower wall portion 20b and an upper wall portion 2a.
0a and the wall column portion 20c is formed integrally with the wall column portion 20c, and the strength of the wall column portion 20c is set smaller than those of the upper wall portion 20a and the lower wall portion 20b. When horizontal external force is applied,
The wall column portion 20c of the earthquake-resistant wall 20 whose strength is set small.
The wall column portion 20c can be yielded early by concentrating the shear stress on the wall column 20c, and the external force energy acting on the frame 18 can be absorbed by the wall column portion 20c. In particular, when the upper beam 12 is relatively displaced horizontally relative to the lower beam 14 due to the input of a horizontal external force, the wall column portion connected to these beams 12, 14 via the upper wall portion 20a and the lower wall portion 20b. Although a positional displacement of approximately the same amount of displacement occurs between the upper end and the lower end of 20c, as shown in FIG.
Is lower than the height h between the upper and lower beams 12, 14, for example, when h '= h / 2, when the upper beam 12 is horizontally displaced by δ, the deformation angle θ of the frame 18 becomes Almost θ = δ / h
At this time, the deformation angle θ ′ of the wall column portion 20c is θ ′
= 2δ / h, which is twice the deformation amount of the frame 18. That is, the distortion generated in the wall column portion 20c is larger than the distortion between the upper and lower beams 12 and 14, whereby the wall column portion 20c surely yields earlier than the frame 18 and absorbs external force energy. Thus, damage to the frame 18 can be reliably prevented.

On the other hand, by forming the wall thickness of the wall pillar portion 20c thinner than the upper wall portion 20a and the lower wall portion 20b, the wall pillar portion 20c can be formed with a very simple configuration.
Can be made lower in strength than the upper wall portion 20a and the lower wall portion 20b, and at this time, the amount of concrete forming the earthquake-resistant wall 20 can be reduced.

Further, according to the above construction method, even if the earthquake-resistant wall 20 is damaged or destroyed in particular, it is easy to remove the damaged earthquake-resistant wall 20 by pulling out the fixing portion by the grout material. The work can be replaced with a new earthquake-resistant wall 20, and the earthquake-resistant function can be easily restored.

By the way, in the above-described embodiment, the case where the concave portion 20d is formed by penetrating the wall portion in the wall thickness direction has been exemplified. However, the concave portion 20d may be formed as a box-shaped concave portion. Of course, beam 1
Any form may be used as long as the anchor 16 protruded from 2, 14 can be inserted and arranged.

FIGS. 3 and 4 show a modification of the above embodiment. The difference from the above-described embodiment is that slits and gaps are formed in the wall column portion 20c, which are divided in the longitudinal direction of the beams 12, 14.

By dividing the wall column portion 20c in this way, even if the wall thickness is the same as the upper wall portion 20a and the lower wall portion 20b, the proof strength can be set low. This is effective in combination with a case where it is not possible to secure a sufficiently low proof stress simply by making the wall column portion 20c thin. In particular, if the strength is reduced by dividing, the strength of the wall column portion 10c can be set arbitrarily and freely according to the number of divisions and the width at the time of division, and the wall column portion 2 having desired energy absorption performance can be set.
0c can be formed.

[0034]

As described above, according to the first aspect of the present invention, the earthquake-resistant wall is formed by precasting, and the concrete is cast in the formwork on site to construct the earthquake-resistant wall. In contrast to this, work materials for building the formwork are not required, and work such as assembling and dismantling the formwork is not required, so that labor for the construction work of the earthquake-resistant wall can be achieved. Also, the curing period of the cast concrete is not required, and the construction period can be shortened. In addition, since it is made of precast, which can be produced in a factory, it is possible to eliminate the work of placing concrete on site and solve the noise problem caused by the use of pump trucks. The construction period can be shortened.

On the other hand, even when compared with the conventional method using a concrete block, the anchoring portions for joining the earthquake-resistant wall to the upper and lower beams are only the concave portions at the upper and lower ends of the earthquake-resistant wall. The amount of the grout material used can be reduced as compared with the case where the grout material is filled over the entire area, and the cost can be reduced.

The earthquake-resistant wall is formed integrally with an upper wall portion, a lower wall portion, and a wall pillar portion formed between the lower wall portion and the upper wall portion. Is set smaller than these upper and lower walls, and when horizontal external force such as an earthquake is applied to the frame, the shear stress is concentrated on The wall column portion yields early, and external energy acting on the frame can be absorbed by the wall column portion. In particular, when the upper beam is horizontally displaced relative to the lower beam due to the input of a horizontal external force, the upper and lower ends of the wall column portions connected to these beams via the upper wall portion and the lower wall portion. Has the same displacement, but the height of the wall column is lower than the height between the upper and lower beams, so the distortion generated in the wall column is larger than the distortion between the upper and lower beams. Thereby, the wall column portion yields earlier than the frame and absorbs the external force energy, so that damage to the frame can be reliably prevented.

According to a second aspect of the present invention, the wall column has a wall thickness smaller than that of the upper wall portion and the lower wall portion. In addition to lowering the strength than the lower and lower wall portions, the amount of concrete forming the earthquake-resistant wall can be reduced.

According to a third aspect of the present invention, the wall column is formed by dividing the wall column in the longitudinal direction of the beam, and the strength of the wall column is arbitrarily and freely determined according to the number of divisions and the width at the time of division. And it is possible to form an earthquake-resistant wall provided with a wall column having a desired energy absorption performance.

According to a fourth aspect of the present invention, there is provided a method for constructing an earthquake-resistant wall, wherein fixing members are protruded from upper and lower beams corresponding to the concave portions of the precast earthquake-resistant wall, and the fixing members are fixed to the concave portions. Are joined to the upper and lower beams, so that, unlike the case of the earthquake-resistant wall of claim 1, unlike the case of constructing an earthquake-resistant wall at the site, the material for building in the formwork is not required, Eliminating the work of building and dismantling the formwork is no longer necessary, and labor savings can be achieved in building the earthquake-resistant wall. Also, the curing period of the cast concrete is not required, and the construction period can be shortened. Furthermore, since the precast earthquake-resistant wall which can be manufactured in the factory is used, the problem of noise caused by the use of the pump truck can be solved, and the work schedule is not limited, thereby shortening the construction period.

On the other hand, even when compared with the conventional method using a concrete block, only the recesses at the upper and lower ends of the earthquake-resistant wall are used for fixing the earthquake-resistant wall to the upper and lower beams, thereby reducing the amount of grout material used. Can reduce the cost of construction.

Even if the earthquake-resistant wall is destroyed, it is possible to replace it with a new earthquake-resistant wall by a simple operation by removing the damaged earthquake-resistant wall by pulling out the anchoring portion of the grout material. The seismic function can be restored.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment in which a precast earthquake-resistant reinforcing wall of the present invention is provided between upper and lower beams.

FIG. 2 is a side view showing a first embodiment in which a precast earthquake-resistant reinforcing wall of the present invention is provided between upper and lower beams.

FIG. 3 is a front view showing a second embodiment in which a precast seismic reinforcing wall of the present invention is provided between upper and lower beams.

FIG. 4 is a side view showing a second embodiment in which a precast seismic retrofitting wall of the present invention is provided between upper and lower beams.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 pillar 12,14 beam 16 anchor 18 frame 20 earthquake-resistant wall 20a upper wall part 20b lower wall part 20c wall pillar part 20d recess

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E002 EB13 FB02 FB25 JA01 JA02 JB09 MA09 MA12 3J066 AA26 BA03 BB01 BB04 BC03 BF02 BG01 BG05

Claims (4)

[Claims] 1. An earthquake-resistant wall provided between upper and lower beams, an upper wall portion having a concave portion at an upper end for fixing a fixing member protruding from the upper beam, and being joined to the upper beam,
A lower wall portion joined to the lower beam having a concave portion at the lower end for fixing a fixing member projecting from the lower beam,
The wall pillar portion formed between the lower wall portion and the upper wall portion is integrally formed by precasting, and the strength of the wall pillar portion is set to be smaller than those of the upper wall portion and the lower wall portion. The characteristic earthquake-resistant wall. 2. The earthquake-resistant wall according to claim 1, wherein a wall thickness of the wall column portion is formed to be thinner than the upper wall portion and the lower wall portion. 3. The earthquake-resistant wall according to claim 1, wherein the wall column portion is formed by being divided in a longitudinal direction of the beam. 4. A method of constructing an earthquake-resistant wall provided between upper and lower beams, comprising: an upper wall portion having a concave portion at an upper end and being joined to an upper beam;
A lower wall portion having a recess at the lower end and being joined to the lower beam,
An earthquake-resistant wall formed between the lower wall portion and the upper wall portion and composed of a wall column portion having lower strength than these wall portions is integrally formed by precasting, and the upper and lower beams are made to correspond to the concave portions. And fixing the fixing member to the recess and joining the earthquake-resistant wall to the upper and lower beams.