JP2001207653A - Mounting structure of reinforcing wall for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely mount a reinforcing wall having easy and sufficient joint strength on an existing building. SOLUTION: When the reinforcing wall 3 is installed between upper and lower beams in the existing building, the upper and lower sections of the reinforcing wall are joined with the upper and lower beams, both upper-lower end sections of wall bars 7 in the reinforcing wall are anchored to the upper and lower beams through post-attachment anchors 8, and reinforcing steel plates 9 for ensuring the anchoring strength of the post-attachment anchors are set up onto both side faces of the beam 1 on the upper side. The lower sections of the reinforcing steel plates are fitted so as to be superposed to the upper section of the reinforcing wall, and anchoring members 11 anchored to the reinforcing wall are secured into the lower sections of the reinforcing steel plates. The reinforcing steel plates installed onto both side faces of the beam are clamped and fixed mutually by clamping bolts 10 penetrated to the beam. The reinforcing steel plates are mounted extending over the overall length of both side faces of the beam while the reinforcing steel plate is set up even onto the base of the beam and the beam is reinforced. The reinforcing wall 3 is fitted as a vertical wall 4 and a spandrel wall and a vibration control damper is secured between these walls. The reinforcing wall is mounted as a mullion wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a reinforced concrete structure (RC structure) or a steel reinforced concrete structure (SRC structure).
The present invention relates to a structure for installing reinforcing walls to improve the seismic performance of existing buildings.

[0002]

2. Description of the Related Art As a method of reinforcing existing buildings with insufficient seismic performance to improve the seismic performance,
Either by installing a high-rigidity earthquake-resistant wall or cubic wall as a seismic reinforcement element at key points to improve the strength of the entire existing building, or by installing various dampers as key elements at key points It is usual to adopt a seismic control method that absorbs seismic energy and reduces vibration. In any case, as such a construction method, it is desired that the livability, function, and usability of the existing building are not significantly reduced, and that the construction can be performed while using the existing building. .

[0003]

However, RC construction and S
It is not always easy to install an earthquake-resistant wall or cubic wall as an earthquake-resistant reinforcement element or a damper as a vibration-damping element in an existing RC building.

[0004] That is, in order to install those earthquake-resistant walls, cubic walls, and dampers in an existing building, they must be securely and firmly integrated with the existing beams (RC beams or SRC beams). In this case, the existing beam is sharply cut to expose the beam rebar, and the reinforcement of the earthquake-resistant wall or cubic wall, and the rebar for damper fixing are joined to the rebar by welding or other means, and concrete is applied to the joint. The work of setting and filling is required. In that case, reinforcement for securing the joining strength and reinforcement for the existing beam itself are required, and it is often necessary to greatly increase the beam cross section.

[0005] Therefore, such work is large-scale and costly, and requires a long construction period, so that it is almost impossible to perform the construction while using the existing building.

In view of the above circumstances, the present invention provides a rational structure that can easily and reliably install a reinforcing wall for an earthquake-resistant reinforcement or a seismic control reinforcement in an existing building with sufficient joint strength. With the goal.

[0007]

According to the first aspect of the present invention, there is provided a radio communication system comprising:
A structure for installing an RC building reinforcement wall between upper and lower beams in an existing building or an existing SRC building, wherein the upper part of the reinforcement wall to be installed is attached to the bottom of the upper beam. And the lower part of the reinforcing wall is bonded to the upper surface of the lower beam, and the upper and lower ends of the wall reinforcement in the reinforcing wall are fixed to the upper and lower beams via retrofitting anchors. Further, reinforcing steel plates for securing the anchoring strength of the retrofitting anchor to the beam are mounted on both side surfaces of the upper beam.

According to a second aspect of the present invention, in the first aspect of the present invention, a lower portion of the reinforcing steel plate is provided so as to overlap an upper portion of the reinforcing wall, and an inner side of the lower portion of the reinforcing steel plate is provided with respect to the reinforcing wall. This is provided with a fixing member to be fixed.

The invention of claim 3 is the invention of claim 1 or 2, wherein a fastening bolt is passed through the beam, and the reinforcing steel plates mounted on both sides of the beam are tightened and fixed by the fastening bolt. is there.

[0010] The invention of claim 4 is the invention of claim 1, 2, or 3
In the invention, reinforcing steel plates are mounted on both sides of the beam over its entire length, and reinforcing steel plates are mounted on the bottom surface of the beam in a range outside the joint position of the reinforcing wall, and the beam is reinforced by the reinforcing steel plates. It was done.

According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, the reinforcing wall is for damping and reinforcing an existing building. It consists of a suspended vertical wall and a waist wall raised from the lower beam, and a vibration damper is installed between the vertical wall and the waist wall.

According to a sixth aspect of the present invention, in the first, second, third, or fourth aspect, the reinforcing wall is provided as a cubic wall for earthquake-resistant reinforcement of an existing building.

[0013]

FIG. 1 and FIG. 2 show a first embodiment of the present invention. In the first embodiment, upper and lower beams (including those using RC beams or SRC beams, and precast members) in an existing building 1 and 2 are used to reinforce the existing building of RC or SRC.
This is applied to the case where the RC reinforcing wall 3 is installed between them. The reinforcing wall 3 according to the first embodiment includes two wall bodies in which a cubic wall is vertically divided, that is, a vertical wall 4 that is lowered from an upper beam 1 and a vertical wall 4 that is raised from a lower beam 2. A damper 6 is provided between the vertical wall 4 and the waist wall 5. As the vibration damper 6, any appropriate one can be used, and for example, a shear panel damper made of a low yield point steel material or a viscoelastic damper in which a viscoelastic body is interposed between steel plates can be suitably used. .

The vertical wall 4 is joined to and integrated with the beam 1 in the structure shown in FIG. That is, the hanging wall 4
The upper end of the inner wall bar (vertical bar) 7 is connected to the beam 1 via a retrofit anchor 8 such as an epoxy anchor or a chemical anchor.
Basically, the beam 1 and the vertical wall 4 are structurally and firmly integrated with each other by the fixing strength of the retrofitting anchor 8, but in the first embodiment, the beam 1 and the vertical wall 4 are relatively fixed. Retrofit anchor 8 to the bottom of existing narrow beam 1
Are provided in two rows, it is assumed that when excessive tensile force and shearing force act on the retrofitting anchor 8, cone breakage may occur at the anchoring portion. The reinforcing steel plates 9 are attached to both sides, and the reinforcing steel plates 9 are fastened and fixed to the beam 1 by fastening bolts 10 having the beams 1 penetrated. The deformation is restrained to reliably prevent the cone of the fixing portion of the retrofitting anchor 8 from being broken.

The lower portion of the reinforcing steel plate 9 is
While overlapping on the upper part of the vertical wall 4 with a length of about 30 cm,
A fixing member 11 to be fixed to the hanging wall 4 is provided inside the lower part of the reinforcing steel plate 9, and the fixing member 11 and the reinforcing steel plate 9 are used not only for the retrofitting anchor 8 but also for the hanging wall 4.
And the beam 1 are joined. The fixing member 11 shown in FIG. 2 is a bent rebar, the upper part of which is welded to the inner surface of the reinforcing steel plate 9.

On the other hand, although not shown in detail, the joining of the waist wall 5 to the lower beam 2 is performed by fixing the wall reinforcement 7 to the beam 2 by the retrofitting anchor 8 as in the case of the vertical wall 4. It is done in. Here, since the slab 12 is integrally provided on the upper part of the lower beam 2, the cone is hardly destroyed by itself. Therefore, the joint between the lumbar wall 5 and the beam 2 is made only by the retrofitting anchor 8. Since the bonding strength is sufficiently secured, the reinforcing steel plate 9 attached to the upper beam 1 may be omitted for the lower beam 2.

The reinforcing wall 3 comprising the vertical wall 4 and the waist wall 5 can be easily constructed by the following procedure. That is, a hole is formed in the bottom surface of the upper beam 1 and the upper surface of the lower beam 2 for inserting a retro anchor 8 such as an epoxy anchor or a chemical anchor, and the retro anchor 8 is inserted and fixed therein. Then, the wall reinforcement 7 is arranged, and the upper end and the lower end thereof are retrofitted with anchors 8 respectively.
Or a predetermined lap length is secured so that a lap joint can be formed. Further, a through-hole for passing a fastening bolt 10 is formed in the upper beam 1, reinforcing steel plates 9 to which a fixing member 11 is attached in advance are mounted on both side surfaces of the beam 1, and are fixed by fastening with the fastening bolt 10. Then, the vertical wall 4 and the lumbar wall 5 are formed by laying a wall form and placing concrete, and after the curing period has elapsed, the mold is removed. The gap slightly generated between the upper part of the vertical wall 4 and the beam 1 may be filled with the grout material 13, and an injection hole for the grout may be formed in the reinforcing steel plate 9 if necessary.

By installing the reinforcing wall 3 consisting of the hanging wall 4 and the waist wall 5 by the above structure, the hanging wall 4 and the waist wall 5 can be securely fixed to the upper and lower beams 1 and 2 by the fixing force of the retrofitting anchor 8. It can be firmly joined. In particular, since the upper part of the vertical wall 4 is joined to the beam 1 not only by the retrofitting anchor 8 but also by the fixing member 11 and the reinforcing steel plate 9, even if the fixing strength by the retrofitting anchor 8 is reduced, the fixing is performed. The joining strength can be ensured by the member 11 and the reinforcing steel plate 9, and since the reinforcing steel plate 9 is attached to both sides of the beam 1 by being tightened with the fastening bolts 10, the fixing portion of the retrofitting anchor 8 is fixed by the reinforcing steel plate 9. Is reliably prevented, and as described above, the strength and reliability of the joint between the vertical wall 4 and the beam 1 can be sufficiently ensured.

When the above-mentioned reinforcing wall 3 is installed, a fixing hole for a retrofitting anchor 8 is formed in the upper and lower beams 1 and 2 and a fastening bolt 10 is passed through the upper beam 1. It is not necessary to perform the large-scale construction that exposes the existing reinforcing bar by cutting the existing beam as in the conventional general method, and it is not necessary to weld the existing reinforcing bar and the new reinforcing bar just by forming the through hole of Therefore, the workability is remarkably superior to the conventional construction method, the construction range and the curing range are limited, and therefore, the construction can be performed while using the existing building.

It is sufficient that the width of the reinforcing wall 3 (vertical wall 4 and waist wall 5) is about 0.8 to 2 m. Function and usability are not greatly impaired. That is,
In the conventional reinforcement method, it is common to provide a large-scale earthquake-resistant wall or brace that covers the entire frame between the columns and beams. It is inevitable that a problem such as a broken line or a reduction in the daylighting area occurs. However, such a problem can be easily avoided by providing the reinforcing wall 3 having a width of at most about 2 m as described above. It is most suitable as a seismic control method for buildings.

The reinforcing wall 3 may be formed by precast members instead of being cast in place. Further, in the above, the reinforcing steel plates 9 on both sides are tightened and attached by the fastening bolts 10 penetrating the beam 1, whereby sufficient strength against cone destruction can be secured.
Each reinforcing steel plate 9 may be attached to the side surface of the beam 1 by a retrofitting anchor without using the fastening bolt 10.

As the fixing member 11 provided on the reinforcing steel plate 9, those shown in FIGS. 3 (a) to 3 (d) can be adopted. The fixing member 14 shown in (a) is obtained by welding a reinforcing bar bent in a substantially U-shape between both reinforcing steel plates 9, (b).
The fixing member 15 shown in FIG. 7 is formed by a through bolt passed between the two reinforcing steel plates 9, the fixing member 16 shown in (c) is obtained by welding a reinforcing bar 16 b to the inner surface of each reinforcing steel plate 9 via a plate 16 a, In the fixing member 17 shown in FIG. 4D, a plate 17a is welded between the two reinforcing steel plates 9 and a reinforcing bar 17
b are welded.
The vertical wall 4 and the beam 1 can be firmly joined to each other via the reinforcing steel plates 9 through 4 to 17.

FIG. 4 shows a second embodiment of the present invention. In the second embodiment, the beam 1 is reinforced over the entire length of the beam 1 based on the first embodiment. That is, in the second embodiment, the reinforcing steel plate 20 is attached not only to the joining position of the hanging wall 4 on both side surfaces of the beam 1 but also to the entire length of the beam 1, and the joining position of the hanging wall 4 is deviated. The reinforcing steel plate 21 is also mounted on the bottom surface of the beam 1 that is present. Similar to the reinforcing steel plate 9 in the first embodiment, the reinforcing steel plate 20 is fastened by fastening bolts 10 penetrating the beam 1 and attached to both sides of the beam 1, and the reinforcing steel plate 21 is attached to a bottom surface of the beam 1 by a retrofitting anchor 22. The grout material 13 is also filled in the gap between the reinforcing steel plate 21 and the bottom surface of the beam 1.

According to the second embodiment, similar to the first embodiment, in addition to obtaining excellent joining strength with respect to the vertical wall 4, a reinforcing effect on the beam 1 itself is obtained by the reinforcing steel plates 20, 21. Therefore, in the related art, even in the case where reinforcement such as enlarging the cross section by piling up the beam 1 is required, the same or more reinforcing effect can be obtained without piling up the beam 1.

FIG. 5 shows a third embodiment. The reinforcing wall 30 in the third embodiment is different from the vertical wall 4 in the first embodiment.
The present invention is applied to a case where the reinforcing wall 30 is provided as an earthquake-resistant reinforcing element in an existing building, and the other configuration is the first embodiment. It is exactly the same as the form. Also in the third embodiment, the upper and lower portions of the cubic wall as the reinforcing wall 30 are attached to the upper and lower beams 1 and 2 respectively by the retrofitting anchors 8.
(Refer to FIG. 2 and not shown in FIG. 5). The reinforcing steel plate 9 is attached to both side surfaces of the upper beam 1 so that the cone breakage of the fixing portion of the retrofitting anchor 8 is reliably prevented. Excellent seismic reinforcement effect can be obtained. Of course, since the reinforcing wall 30 is installed as a cubic wall, it is easy to avoid troubles such as the opening part being closed and the flow line being cut off as in the case of providing a normal earthquake-resistant wall, and the lighting area being reduced, It is the best method for retrofitting existing buildings. In addition, the various modified examples and application examples described in the first embodiment, and the reinforced steel plate 2 described in the second embodiment.
Needless to say, the reinforcement of the beam 1 by 0 and 21 can be adopted in the third embodiment as well.

[0026]

According to the first aspect of the present invention, the RC structure or the SR structure is used.
A structure for installing an RC reinforcing wall between upper and lower beams in an existing C building, wherein upper and lower portions of the reinforcing wall to be installed are respectively joined to the upper and lower beams, and the reinforcing wall is provided. The upper and lower ends of the inner wall are fixed to the upper and lower beams via retrofitting anchors, and reinforcing steel plates are attached to both sides of the upper beam to secure the anchoring strength of the retrofitting anchors to the beams. Because
The reinforcing wall can be securely and firmly joined to the upper and lower beams by the anchoring force of the retrofitting anchor, and the reinforcing steel plate reliably prevents the cone breakage at the anchoring portion of the retrofitting anchor and joins the reinforcing wall and the beam The strength and reliability of the part can be sufficiently ensured, the construction is easy, and the construction can be performed while using the existing building.

According to the second aspect of the present invention, the lower portion of the reinforcing steel plate is provided so as to overlap the upper portion of the reinforcing wall, and the fixing member fixed to the reinforcing wall is provided inside the lower portion of the reinforcing steel plate. The upper part and the beam are joined not only by the retrofitting anchor but also by the fixing member and the reinforcing steel plate, so that the bonding strength can be further increased, and even if the fixing strength by the retrofitting anchor decreases, the fixing member and the reinforcing steel plate Thereby, the bonding strength can be compensated.

According to the third aspect of the present invention, the reinforcing steel plates mounted on both sides of the beam are fastened and fixed to each other by the fastening bolts penetrating the beam. Thus, the strength and reliability of the joint can be sufficiently ensured.

According to a fourth aspect of the present invention, a reinforcing steel plate is mounted on both sides of the beam over its entire length, and a reinforcing steel plate is mounted on the bottom surface of the beam in a range outside the joint position of the reinforcing wall, and the reinforcing steel plate is used by the reinforcing steel plate. The reinforcement effect on the beam itself is obtained by the reinforcing steel plate, and therefore, even if the strength of the beam of the existing building is not sufficient, it is necessary to reinforce the beam to expand the cross section. The same or higher reinforcement effect can be obtained without performing.

According to a fifth aspect of the present invention, the reinforcing wall is provided for the purpose of damping and reinforcing the existing building.
The reinforcement wall was composed of a vertical wall lowered from the upper beam and a waist wall raised from the lower beam, and a vibration damper was installed between the vertical wall and the waist wall. So
Not only can the damping damper provide an excellent damping reinforcement effect, but the damping damper does not greatly impair the livability, function, or usability. Best to do.

According to the invention of claim 6, since the reinforcing wall is provided as a cubic wall for seismic reinforcement of an existing building, not only an excellent effect of seismic reinforcement is obtained, but also the opening portion as in the case of providing a seismic wall. It is easy to avoid problems such as blockage of traffic flow and cut off of the lighting area, and it is the most suitable as a seismic retrofitting method for existing buildings.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the same.

FIG. 3 is a diagram showing an example of a fixing member in the reinforcing steel sheet.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1, 2 beams 3 reinforcing wall 4 vertical wall 5 waist wall 6 vibration damper 7 wall reinforcement 8 retrofitting anchor 9 reinforcing steel plate 10 fastening bolt 11 anchoring member 14-17 anchoring member 20, 21 reinforcing steel plate 30 reinforcing wall

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) E04H 9/02 321 E04H 9/02 321A 351 351

Claims (6)

[Claims] 1. A structure for installing an RC reinforcing wall between upper and lower beams in an existing RC or SRC existing building, wherein an upper part of the reinforcing wall to be installed is provided. The lower wall of the reinforcing wall is bonded to the upper surface of the lower beam, and the upper and lower ends of the wall in the reinforcing wall are attached to the upper and lower beams, respectively. An installation structure of a reinforcing wall for an existing building, wherein a reinforcing steel plate is attached to both sides of the upper beam to secure the anchoring strength of the retrofitted anchor to the beam, and the reinforcing steel plate is attached to both sides of the upper beam. . 2. The installation structure of a reinforcing wall for an existing building according to claim 1, wherein a lower portion of the reinforcing steel plate is provided so as to overlap an upper portion of the reinforcing wall, and the lower inner side of the reinforcing steel plate includes An installation structure of a reinforcing wall for an existing building, wherein a fixing member fixed to the reinforcing wall is provided. 3. The installation structure of a reinforcing wall for an existing building according to claim 1 or 2, wherein a fastening bolt is passed through the beam, and the reinforcing steel plates mounted on both side surfaces of the beam by the fastening bolt. An installation structure for reinforcing walls for existing buildings, which is fastened and fixed. 4. The installation structure of a reinforcing wall for an existing building according to claim 1, 2 or 3, wherein a reinforcing steel plate is attached to both sides of the beam over its entire length, and the reinforcing member is provided on a bottom surface of the beam. A reinforcing wall installation structure for an existing building, wherein a reinforcing steel plate is mounted in a range outside a joint position of a wall, and the beam is reinforced by the reinforcing steel plate. 5. The installation structure of a reinforcing wall for an existing building according to claim 1, 2, 3, or 4, wherein the reinforcing wall is for damping and reinforcing the existing building. It is composed of a vertical wall lowered from the upper beam and a waist wall raised from the lower beam, and a vibration damper is installed between the vertical wall and the waist wall. Installation structure of reinforcing walls for existing buildings. 6. The installation structure of a reinforcing wall for an existing building according to claim 1, 2, 3, or 4, wherein the reinforcing wall is a cubic wall for seismic reinforcement of the existing building. Installation structure of reinforcing walls for buildings.