JP2009174148A - Seismic strengthening structure and seismic strengthening method for concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic strengthening structure and a seismic strengthening method for a concrete structure, which enable weight reduction while bringing about necessary reinforcing strength, when seismic strengthening is performed by sandwiching a column section of the concrete structure and a concrete wall adjacent to the column section by a reinforcing plate, and tightening a binding member passing through the reinforcing plate and the concrete wall, facing each other, so as to apply prestress. <P>SOLUTION: In this strengthening structure with a uniform thickness, the concrete wall 11 and a lightweight wall member 12 with a specific gravity lower than that of the concrete wall 11 are provided in the state of being superposed in a thickness direction between the opposed reinforcing plates 8, so as to achieve weight saving; and concurrently with that, the opposed reinforcing plates 8 are linearly elongated in the length direction of the column section 3 at an interval approximately identical in dimension to the thickness of the column section 3. Thus, the integration of the opposed reinforcing plates 8 with the wall member between the opposed reinforcing plates 8 is enhanced for an increase in strengthening effect, and the occurrence of concentration of stress is avoided in the application of a load during earthquakes. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seismic reinforcement structure and a seismic reinforcement method for a concrete structure, and more specifically, a pillar portion of a concrete structure and both sides of a concrete wall adjacent to the pillar portion are sandwiched by reinforcement plates, and the opposed reinforcement plate and concrete It is related to seismic reinforcement structure and seismic reinforcement method of concrete structure that enables weight reduction while obtaining necessary reinforcement strength when tightening the tightening member penetrating the wall and applying prestress. is there.

  Various seismic reinforcement methods for concrete structures have been proposed. For example, the three sides of the column portion are wound up by the reinforcing plate, protruded in the direction of the column portion, the reinforcing plate is placed, and the concrete wall adjacent to the column portion is sandwiched in the thickness direction. There has been proposed a seismic reinforcement method in which a fastening member is passed through a facing reinforcing plate and the fastening member is tightened (see Patent Documents 1 and 2). According to the proposed seismic reinforcement method, by tightening the fastening member, both sides of the column part and the concrete wall are compressed by the facing reinforcement plate, and prestress is applied, so the reinforcement strength is remarkably improved. Can do.

  The interval between the reinforcing plates disposed opposite to each other is substantially the same as the thickness of the column portion. Therefore, in order to obtain the necessary reinforcement strength, even if it is not necessary to increase the thickness of the concrete wall, it will be the same thickness as the pillar part, and the concrete wall will become unnecessarily thick. As a result, the added weight also increases. When applying seismic reinforcement, it is preferable to reduce the weight by reducing unnecessary added weight, but this structure is disadvantageous for reducing the weight.

Here, the thickness of the concrete wall can be set based on the necessary reinforcing strength, and a concrete wall having a thickness thinner than the thickness of the column portion can also be used. In this case, the interval between the reinforcing plates to be placed changes between the column portion and the concrete wall portion. That is, the thickness of the reinforcing structure is not uniform, for example, the reinforcing plate to be placed has a step in the middle. In this way, when the thickness of the reinforcing structure is not uniform, the construction becomes complicated, and the integrity of the pillar part and the newly installed concrete wall is impaired, and tension is introduced by the fastening member. However, there arises a new problem that the lateral restraining effect is greatly reduced.
Japanese Patent No. 3834637 JP 2006-274783 A

  It is an object of the present invention to sandwich a column portion of a concrete structure and a concrete wall adjacent to the column portion with a reinforcing plate, and tighten the opposing reinforcing plate and a fastening member penetrating the concrete wall to impart prestress and thereby provide earthquake resistance. An object of the present invention is to provide a seismic reinforcing structure and a seismic reinforcing method for a concrete structure that can be reduced in weight while obtaining necessary reinforcing strength.

  In order to achieve the above object, the seismic reinforcement structure for a concrete structure according to the present invention is wound around the three sides of the pillar portion of the concrete structure, protrudes in the direction of the pillar portion, and is approximately the same as the thickness of the pillar portion. A reinforcing plate disposed between the two reinforcing plates, a concrete wall provided between the opposed reinforcing plates, and a tightening member penetrating the concrete wall and the facing reinforcing plate, and the facing reinforcement by the tightened tightening member In a seismic reinforcement structure for a concrete structure in which both sides of the pillar portion and the concrete wall in the thickness direction are compressed by a plate and prestressed, together with the concrete wall between the facing reinforcement plates, the concrete wall A light-weight wall member having a small specific gravity is laminated in the thickness direction, and the fastening member is the light-weight wall. It is characterized in that it has a configuration to penetrate the wood.

  Further, the seismic reinforcement method for a concrete structure according to the present invention winds up the three sides of the column portion of the concrete structure with a reinforcing plate and protrudes in the direction of the column portion so as to be substantially the same as the thickness of the column portion. The reinforcing plate is placed opposite to the concrete wall provided between the placed reinforcing plates, and the fastening member is passed through the placed reinforcing plate, and the fastening member is tightened to fix the pillar portion and the concrete. In a seismic reinforcement method for a concrete structure in which both sides in the thickness direction of the wall are compressed and prestressed, after the reinforcing plates are placed facing each other, the concrete walls are placed between the facing reinforcing plates together with the concrete walls. Lightweight wall members with small specific gravity are stacked in the thickness direction, and the stacked concrete And a lightweight wall member, by penetrating the tie element to the reinforcing plates opposing, and is characterized in that it has to raise tightening.

  According to the present invention, the concrete wall is wound around the three sides of the column portion, protrudes in the direction of the column portion, and is placed between the reinforcement plates facing each other at substantially the same interval as the thickness of the column portion. Since light weight wall members with a specific gravity smaller than that of concrete walls are provided in layers, the weight is reduced according to the volume in which the concrete walls are replaced with light weight wall members, compared to the conventional structure in which only the concrete walls are arranged. be able to. In addition, since the facing reinforcing plates are linearly extended at substantially the same interval as the thickness of the column portion with the concrete wall and the lightweight wall member interposed therebetween, a reinforcing structure with a uniform thickness is obtained. Thereby, the integrity of the pillar portion and the concrete wall is enhanced, and the high lateral restraint effect obtained by applying prestress to the pillar portion and the concrete wall via the opposed reinforcing plates is not impaired. Therefore, it is possible to eliminate the adverse effect that the reinforcing strength is reduced as in the case of a reinforcing structure in which the thickness changes midway due to the reinforcing plate being extended with a step in the middle.

  Therefore, the concrete wall placed between the facing reinforcing plates may be set to a thickness necessary for reinforcement, and the gap between the concrete wall set to the required thickness and the facing reinforcing plate is a lightweight wall. What is necessary is just to fill with a member. Thereby, it is not necessary to make the concrete wall have the same thickness as that of the column portion, and it is possible to reduce the weight while obtaining a necessary reinforcing strength.

  Hereinafter, the earthquake-proof reinforcement structure and the earthquake-proof reinforcement method of a concrete structure of the present invention will be described based on the embodiments shown in the drawings.

  As shown in FIG. 5, a concrete structure 1 to be subjected to seismic reinforcement of the present invention has a beam portion 2 installed between a column portion 3 and a column portion 3 erected on a floor portion 4. It is the concrete structure 1 which has the flame | frame which opened the area | region enclosed by.

  The seismic reinforcement structure for a concrete structure of the present invention is similarly applied to each column portion 3 as illustrated in FIG. This seismic reinforcement structure is a sleeve wall type reinforcement structure. As illustrated in FIG. 2, the column portion 3 is formed of a reinforcing bar 5 and concrete 6. The reinforcing bar 5 is composed of a main reinforcing bar that is linearly extended in the vertical direction and a band reinforcing bar that is arranged so as to surround a plurality of main reinforcing bars. Similarly, the beam portion 2 is formed of reinforced concrete.

  A reinforcing plate channel 7 having a U-shaped cross section having a thickness of about 3 mm to 9 mm is disposed along the outer peripheral surface of the column portion 3. As a result, the reinforcing plate 8 is wound around the three directions of the column portion 3 and protrudes in the direction of the column portion 3 (left and right direction in FIG. 2) so as to face each other at substantially the same interval as the thickness of the column portion 3. It has become. The reinforcing plate channel 7 may be produced by bending a single steel plate, or may be produced by contacting a plurality of steel plates.

  As a result, the reinforcing plate 8 facing the reinforcing plate channel 7 sandwiches the column portion 3 in the thickness direction and protrudes in the direction of the column portion 3 so as to face each other at substantially the same interval as the thickness of the column portion 3. ing. The three surfaces of the column part 3 and the reinforcing plate channel 7 (reinforcing plate 8) are separated by about 10 mm. The grout (high-strength paste material) filled in the gaps makes the three directions of the column part 3 The surface and the reinforcing plate are fixed integrally.

  The reinforcing plate channel 7 (reinforcing plate 8) has, for example, a height from a position of about 20 mm to 30 mm upward from the surface of the floor portion 4 to a position of about 20 mm to 30 mm downward from the lower end of the beam portion 2. Yes. The reinforcing plate channel 7 can also be provided from the surface of the floor portion 4 to the lower end of the beam portion 2. Further, the reinforcing plate 8 may be separated from the reinforcing plate channel 7.

  A concrete wall 11 and a lightweight wall member 12 are laminated in the thickness direction between the opposed reinforcing plates 8 and 8. In this embodiment, a concrete wall 11 is disposed at the center in the thickness direction, and lightweight wall members 12 having the same thickness are disposed on both sides of the concrete wall 11. The lightweight wall member 12 has a specific gravity smaller than that of the concrete wall 11 and can be exemplified by a hard foam (a variety of hard resin foams such as hard foam urethane and hard foam polystyrene). The concrete wall 11 can be formed of concrete cast on site, and a precast concrete wall or a concrete block wall can also be used.

  A PC steel rod 9 penetrates through the concrete wall 11, the lightweight wall member 12, and the opposing reinforcing plate 8 in the thickness direction. The PC steel rod 9 is fixed by fixing nuts 10 screwed together with washers at both ends. The PC steel rod 9 is tightened by retightening the fixing nut 9. In the case where the reinforcing plate channel 7 is manufactured by contacting a plurality of steel plates, it is preferable to have a structure in which the PC steel rod 9 is penetrated in the connecting margin (overlap margin).

  By this tightened PC steel rod 9, both sides in the thickness direction of the column portion 3 are compressed via the opposing reinforcing plates 8 and prestressed. Moreover, both the thickness direction both surfaces of the concrete wall 11 are compressed through the opposing reinforcement plate 8 and the lightweight wall member 12, and the prestress is provided. Thus, the PC steel bar 9 functions as a fastening member that presses the reinforcing plate 8 disposed opposite to the reinforcing plate 8 therebetween.

  In this embodiment, since the PC steel bar 9 is used as the fastening member, prestress can be applied to the column portion 3 and the concrete wall 11. As the binding member, other metal rods or the like can be used.

  The lightweight wall member 12 has a specific gravity smaller than that of the concrete wall 11 and has a rigidity that does not cause plastic deformation due to an external force generated when the PC steel rod 9 is tightened. Examples of the lightweight wall member 12 include wood and the like in addition to hard foam. Rigid foams have the advantage that specific gravity can be easily reduced and can be easily processed to an arbitrary thickness.

  Since the specific gravity of the concrete wall 11 is about 2.0 to 2.2, the specific gravity of the lightweight wall member 12 is preferably less than 2.0, for example, about 0.01 to 1.0. This is because if the specific gravity of the lightweight wall member 12 exceeds 1.0, a sufficient lightening effect cannot be obtained, and if it is less than 0.01, it is difficult to ensure sufficient reinforcing strength. The reinforcing plate 8, the lightweight wall member 12, and the concrete wall 11 are in an unfixed state with each other, and are bonded to each other by tightening the PC steel rod 9.

  This seismic reinforcement structure is constructed by the following procedure.

  First, the reinforcing plate channel 7 is installed along the outer peripheral surface of the column part 3 from the outside so as to enclose the column part 3. As a result, the reinforcing plate 8 of the reinforcing plate channel 7 is wound around the three sides of the column part, protrudes in the direction of the column part 3 and faces the column part at substantially the same interval. The gap between the three-way surface of the column part 3 and the reinforcing plate channel 7 (reinforcing plate 8) is filled with grout to fix the three-side surface of the column part 3 and the reinforcing plate channel 7 integrally.

  A concrete wall 11 and a lightweight wall member 12 are laminated in the thickness direction between the reinforcing plates 8 facing each other at substantially the same interval as the thickness of the column portion 3. The concrete wall 11 is set to a thickness necessary for reinforcement without being restricted by the thickness of the column portion 3. A lightweight wall member 12 having a thickness obtained by subtracting the set thickness of the concrete wall 11 from the interval between the reinforcing plates 8 is arranged between the opposing reinforcing plates 8.

  Thereafter, the concrete wall 11 having a set thickness is formed by placing concrete in the remaining gap. When a precast concrete wall or a concrete block wall is adopted as the concrete wall 11, the construction becomes easy and the construction period can be shortened.

  A PC steel rod 9 is passed through the concrete wall 11, the lightweight wall member 12, and the opposing reinforcing plate 8. The PC steel bar 9 penetrated is fixed by screwing a fixing nut 10 with washers interposed at both ends.

  When concrete is cast and the concrete wall 11 is formed, the PC steel rod 9 is preferably passed through the reinforcing plate 8 and the lightweight wall member 12 facing each other before placing the concrete. When placing concrete, the reinforcing plate channel 7 (reinforcing plate 8) functions as a formwork.

  Then, the PC steel rod 9 is tightened by tightening the fixing nut 10 and both the thickness direction both sides of the column portion 3 and the concrete wall 11 are compressed through the opposing reinforcing plates 8 to apply prestress. The strength of the prestress to be applied is adjusted by adjusting the strength of the tightening tightening of the fixing nut 10. For example, a tension strain of about 0.1% is applied, and the opposing reinforcing plate 8 is placed between the reinforcing plates 8. It is made to crimp | bond to the pinched member, and when it receives a shear force, it does not produce a shift | offset | difference.

  When the concrete wall 11 is arranged in the center in the thickness direction between the reinforcing plates 8 facing each other and the lightweight wall members 12 are arranged on both sides of the concrete wall 11 as in this embodiment, more stable reinforcement without unevenness. Can be applied. As illustrated in FIG. 3, one concrete wall 11 and one light-weight wall member 12 are sequentially laminated in the thickness direction between the reinforcing plates 8 disposed opposite to each other, and the concrete wall 11 is eccentric from the center in the thickness direction. It can also be arranged. Further, as illustrated in FIG. 4, a concrete block wall 13 is arranged in the center in the thickness direction, and another concrete wall (concrete wall formed by on-site placement) 11 and a lightweight wall member sandwiching the concrete block wall 13. 12 can also be arranged.

  In the present invention, as described above, the column portion 3 is compressed with the concrete wall 11 adjacent to the column portion 3 through the opposed reinforcing plate 8 and prestressed, so that the passive lateral restraint effect is provided. Not only can the toughness of the concrete structure 1 be increased and the horizontal proof stress increased by the (restraint reaction force generated only when concrete expands), but also the active lateral restraint effect (initially independent of concrete expansion) Can also be obtained. That is, a large horizontal shearing force and high toughness can be ensured while avoiding the protruding, peeling, and peeling of concrete during an earthquake, and the reinforcing strength can be significantly increased. Further, since the three directions of the column portion 3 are wound around the reinforcing plate channel 7 (reinforcing plate 8), the strength and toughness of the column portion 3 are improved.

  Here, compared with the conventional structure in which only the concrete wall 11 is arranged between the opposed reinforcing plates 8, a part of the concrete wall 11 is replaced with the lightweight wall member 12, so that the lightweight wall member 12 is replaced. The weight can be reduced according to the volume.

  Further, the reinforcing plate 8 disposed in a facing manner has a uniform thickness reinforcing structure extending linearly at substantially the same interval as the thickness of the column portion 3 with the concrete wall 11 and the lightweight wall member 12 interposed therebetween. . Since the shape has no step or the like in this way, the construction is simple, and the integrity of the pillar portion 3 and the newly installed concrete wall 11 and lightweight wall member 12 is not impaired.

  Moreover, since the reinforcing plate 8 is pressure-bonded to the concrete wall 11 including the light-weight wall member 12 by introducing the tension force by the PC steel bar 9 and used as a lateral reinforcing material, a shear reinforcing effect and a lateral restraining effect are expected more and more. be able to. The reinforcing plate 8 (reinforcing plate channel 7) can prevent the concrete from jumping even when the concrete inside is crushed. Further, since there is no step or the like on the reinforcing plate 8, it is possible to avoid the phenomenon that stress concentration is unlikely to occur during a load such as an earthquake and the reinforcing strength is reduced. Thus, the high reinforcement strength described above is not impaired.

  Therefore, the concrete wall 11 disposed between the reinforcing plates 8 placed on the opposite side is not limited by the thickness of the column part 3 and may be set to a minimum thickness necessary for reinforcement, and the thickness is set. What is necessary is just to fill the gap between the concrete wall 11 and the facing reinforcing plate 8 with the lightweight wall member 12. Thereby, it is not necessary to wastefully make the thickness of the concrete wall 11 the same as that of the column part 3, and it is possible to reduce the weight while obtaining a necessary reinforcing strength. In the present invention, when applying seismic reinforcement, a wasteful additional weight can be reduced, so that the structure is extremely advantageous as a seismic reinforcement structure.

  6 and 7 illustrate another embodiment of the seismic reinforcement structure. This seismic reinforcement structure is a non-opening wall type reinforcing structure in which the opening of the piloty frame is closed. The basic structure is the same as that of the previous embodiment, and can be the various specifications described above. Therefore, differences from the previous embodiment will be described below.

  In this embodiment, reinforcing plate 8a, 8b, 8c separate from the U-shaped reinforcing plate channel 7 is provided. Reinforcing plate channels 7 disposed along the outer peripheral surface of the column portion 3 are provided with reinforcing plates 8a, 8b, and 8c that face each other in order from the bottom. Unlike the previous embodiment, the opposed reinforcing plates are divided into a plurality in the height direction.

  A lower portion of the concrete wall 11 is fixed to the floor portion 4 by an anchor member 14. Further, the uppermost facing reinforcing plate 8c is fixed to the beam portion 2 by a PC steel rod 9 passing through the facing reinforcing plate 8c and the beam portion 2 and a fixing nut 10 with a washer interposed. In the reinforcing structure illustrated in FIG. 1, the lower portion of the concrete wall 11 can be fixed to the floor portion 4 by the anchor member 14.

  This seismic reinforcement structure is constructed by the following procedure.

  First, as illustrated in FIG. 8, the reinforcing plate channel 7 is disposed along the outer peripheral surface of each column portion 3. An anchor member 14 is embedded halfway in the floor portion 4.

  Next, as illustrated in FIG. 9, the lowermost reinforcing plate 8 a is disposed so as to be installed in each column portion 3 and is opposed to each other. At this time, the PC steel rod 9 is passed through the opposing reinforcing plate 8a, and is temporarily fixed by the fixing nut 10 with a washer interposed. The spacing between the opposing reinforcing plates 8a is substantially the same as the thickness of the column portion 3.

  A lightweight wall member 12 having a predetermined thickness is disposed between the opposing reinforcing plates 8a. Thereafter, concrete is cast into the remaining gaps to form the concrete wall 11. As a result, the protruding anchor member 14 is embedded in the concrete wall 11. After the step of laminating the concrete wall 11 and the lightweight wall member 12 in the thickness direction between the opposing reinforcing plates 8 at the lowest level, the same process is performed at the second level. In this way, the above-described steps are sequentially performed from the bottom to the top. The reinforcing plate 8c facing the uppermost stage is fixed to the lower reinforcing plate 8b and the beam portion 2 by a fixing nut 10 with a PC steel rod 9 and a washer interposed therebetween.

  Next, the PC nut 9 is tightened by tightening the fixing nut 10, and both the thickness direction both sides of the column part 3, the concrete wall 11 and the beam part 2 are compressed through the opposed reinforcing plates 8 a, 8 b, 8 c. And give prestress.

  According to this embodiment, the same effect as that of the embodiment of FIG. 1 can be obtained. Furthermore, since it is made into the reinforcement structure fixed to the floor part 4 and the beam part 2, the range wider than embodiment of FIG. 1 can be reinforced. Therefore, it is suitable for the case of seismic reinforcement over a relatively wide range.

  In the above-described embodiment, the case where the concrete structure 1 having a frame is reinforced by earthquake resistance is illustrated. However, the present invention is applied to the case where a concrete structure having a piloty frame and various other structures are reinforced by earthquake resistance. Can also be applied. For example, it is suitable for a concrete structure having a structure in which the horizontal rigidity and strength are unbalanced in the vertical direction, or a concrete structure having a rigid frame structure having insufficient horizontal strength.

  The present invention can be applied not only to the existing concrete structure 1 but also to a new construction of the concrete structure 1.

It is a front view which illustrates the earthquake-proof reinforcement structure of the concrete structure of this invention. It is AA sectional drawing of FIG. It is AA sectional drawing which shows the modification of the seismic reinforcement structure of FIG. It is AA sectional drawing which shows another modification of the seismic reinforcement structure of FIG. It is a front view which illustrates the concrete structure before carrying out earthquake-proof reinforcement. It is a front view which shows another example of the earthquake-proof reinforcement structure of the concrete structure of this invention. It is BB sectional drawing of FIG. It is a front view which illustrates the procedure which builds the earthquake-proof reinforcement structure of FIG. FIG. 9 is a front view illustrating the next procedure of FIG. 8. FIG. 10 is a front view illustrating the next procedure of FIG. 9.

Explanation of symbols

1 Concrete Structure 2 Beam Part 3 Column Part 4 Floor Part 5 Reinforcing Bar
6 Concrete 7 Reinforcement plate channel 8 8a, 8b, 8c Reinforcement plate 9 PC steel bar (tightening member)
DESCRIPTION OF SYMBOLS 10 Fixing nut 11 Concrete wall 12 Lightweight wall member 13 Concrete block wall 14 Anchor member

Claims (10)

  Reinforcement plates that are wound around the three sides of the pillar part of the concrete structure, project in the direction of the pillar part, and face each other at approximately the same distance as the thickness of the pillar part, and the concrete provided between the opposite reinforcement plates A wall and a fastening member penetrating the concrete wall and the facing reinforcing plate, and the reinforcing plate placed by the tightened fastening member compresses both sides of the column portion and the concrete wall in the thickness direction. In the seismic reinforcement structure of a concrete structure to which stress is applied, a lightweight wall member having a specific gravity smaller than that of the concrete wall is laminated in the thickness direction with the concrete wall between the facing reinforcement plates. A seismic reinforcement structure for a concrete structure in which the binding member penetrates the lightweight wall member.   The seismic reinforcement structure for a concrete structure according to claim 1, wherein the lightweight wall member is a hard foam.   The seismic reinforcement structure for a concrete structure according to claim 1 or 2, wherein the lightweight wall member has a specific gravity of 0.01 to 1.0.   The seismic reinforcement structure for a concrete structure according to claim 1, wherein the lightweight wall member is laminated on both sides of the concrete wall with the concrete wall interposed therebetween.   The seismic reinforcement structure for a concrete structure according to any one of claims 1 to 4, wherein the concrete wall is a precast concrete wall or a concrete block wall.   The concrete wall is a concrete wall formed by concrete placed on site, the lower part of the concrete wall is fixed to the floor part by an anchor member, and the upper part of the facing reinforcing plate is constructed to the pillar part. The seismic reinforcement structure for a concrete structure according to any one of claims 1 to 4, which is fixed to a beam portion.   The three sides of the pillar part of the concrete structure are rolled up by the reinforcing plate, protruded in the direction of the pillar part, and the reinforcing plate is placed at approximately the same interval as the thickness of the pillar part. A tightening member is passed through the provided concrete wall and the facing reinforcing plate, and the tightening member is tightened and the facing reinforcing plate compresses both sides of the column part and the thickness direction of the concrete wall to give prestress. In the seismic reinforcement method for a concrete structure, after the reinforcing plates are placed, a lightweight wall member having a specific gravity smaller than that of the concrete walls is laminated between the reinforcing plates placed in the thickness direction. Placed on the laminated concrete wall and lightweight wall member, and the opposed reinforcing plate The binding member by penetrating, seismic reinforcement method of the concrete structure which is adapted raise tightening.   The method for seismic reinforcement of a concrete structure according to claim 7, wherein a hard foam is used for the lightweight wall member.   The method for seismic reinforcement of a concrete structure according to claim 7 or 8, wherein a precast concrete wall or a concrete block wall is used as the concrete wall.   The step of laminating the facing reinforcing plates into a plurality of portions in the height direction, and laminating a concrete wall and a lightweight wall member in the thickness direction between the facing reinforcing plates one by one from the bottom step The concrete wall of each step is formed by concrete placed between the reinforcing plates facing each other, and the concrete wall formed at the bottom is fixed to the floor portion by an anchor member. The method for seismic reinforcement of a concrete structure according to claim 7 or 8, wherein the reinforcing plate placed in step (a) is fixed to a beam portion installed on the column portion.

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