JP3804322B2 - Seismic reinforcement structure using seismic reinforcement steel plate, installation method of seismic reinforcement steel plate, seismic reinforcement method using seismic reinforcement steel plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic reinforcing structure using a seismic reinforcing steel plate and a method for attaching the seismic reinforcing structure.
[0002]
[Prior art]
As one of the seismic reinforcement means for a reinforced concrete structure, for example, as shown in Japanese Patent Application Laid-Open No. 9-158490 and Japanese Patent Publication No. 57-12833, a technique for attaching a seismic reinforcement steel plate to an existing concrete wall surface is disclosed. FIG. 6 shows a conventional reinforcing steel plate mounting structure disclosed in these publications. In the lower part of the beam 1, the reinforcing steel plate 3 is fixed over a surface of the existing wall surface 2 via a plurality of anchors 4. ing.
[0003]
Further, in order to increase the seismic effect of the seismic strengthened steel plate 3, it is necessary to anchor the upper and lower ends thereof by post-construction. Therefore, normally, the installation position of the strengthened steel plate is within the width of the beam 1. The reinforcing steel plate 3 is arranged from the lower part of the beam 1 to the slab 6 on the beam 1 on the lower floor.
[0004]
[Problems to be solved by the invention]
However, in such a seismic reinforcement structure using the conventional seismic reinforcement steel plate, there are the following technical problems. The first problem is that the reinforcing steel plate 3 itself is a panel having a side length corresponding to at least one side length of the wall surface. That is.
[0005]
The second problem also arises when the reinforcing steel plate has to be installed on the side of the beam depending on circumstances when the wall is provided eccentric to the beam. In this case, the reinforcing steel plate 3 The lower end of the floor is a non-beam floor slab position, and the anchor supporting force after construction becomes insufficient, which may also cause a decrease in seismic performance.
[0006]
The present invention solves the above-mentioned problems, and its purpose is to provide a reinforcing steel plate and its mounting structure in a shape that can maintain sufficient rigidity, and support even when the arrangement position is out of the plane of the beam. An attachment method having high strength is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided with a plurality of rib members made up of flanges and webs such as shaped steel at predetermined intervals in the transverse direction between upper and lower beams or slabs in an existing reinforced concrete structure. , between each rib member, the earthquake-proof reinforcement steel sheet having a flange at two sides at least facing, and to level the two sides of the flange to the opposite, is fixed to the multistage, the rib both side portions of the earthquake-proof reinforcement steel It is characterized by being bonded to the material . Therefore, in the earthquake-resistant structure of the present invention, the rib material web and the flange of the earthquake-resistant reinforcing steel plate function as a lattice stiffener, thereby preventing buckling of the earthquake-resistant reinforcing structure. Moreover, since each member becomes a size and weight suitable for carrying of an operator, small conveyance is easy. Furthermore, when assembling, seismic reinforcing steel plates can be stacked between the ribs installed vertically, and the seismic reinforcing steel plates arranged in multiple stages are fixed with bolts that join the flanges. Therefore, the work becomes a small turn, and it is possible to perform construction with as much as possible hindering work and residence in the building subject to seismic reinforcement.
[0008]
In this invention, each said earthquake-proof reinforcement steel plate consists of groove steel, and it makes it the composition which mutually connected using the bolt nut which penetrates between the flanges, making the flange parts face each other and making the flange part face each other. Since the seismic reinforced steel plate is a grooved steel, the labor of welding the flange can be saved.
[0009]
Further, in the above invention, if the rib material is a T-shaped steel, the rib material is a T-shaped steel. Therefore, there is no flange at one end of the web, and there is no obstacle when installing the seismic reinforced steel plate. Easy to work.
[0010]
Mounting how to earthquake-proof steel sheet of the present invention, when constructing a seismic reinforcement structure using the above-described seismic reinforcing steel, the upper part of the earthquake-proof reinforcement steel with anchor to the side of the lower portion of the beam, located at the lower end of the steel plate The floor slab is drilled, and the lower end of the steel plate and the reinforcing steel material anchored to the upper side surface of the beam on the lower floor are bolted by bolts passed through the hole. According to the method of the present invention, the area of the seismic reinforcing steel plate can be reduced by keeping the upper end of the seismic reinforcing steel plate at the height to the lower side surface of the beam. It is.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same location as the past, and it demonstrates newly, or it demonstrates using a new code | symbol only for a new part.
[0012]
In the figure, the existing concrete wall surface 2 is formed on the same surface with respect to the beam 1 and the column 7, and the reinforcing steel plates 10 are arranged in multiple stages on the same surface side. Prior to the attachment of the reinforcing steel plate 10, a rib member 12 made of a CT (cut tee) material having a T-shaped cross section is attached to the wall surface 2 in a vertically installed state at a predetermined interval in the lateral direction by, for example, a chemical anchor 14. Both sides of the reinforcing steel plate 10 are fixed to the flange 12a of the rib member 12 in multiple stages by welding.
[0013]
Each reinforcing steel plate 10 is made of channel steel, and is vertically arranged in a state where the upper and lower flanges 10 a are abutted with each other, and is connected to each other by passing through both flanges 10 a and connecting with bolts and nuts 16.
[0014]
A long bolt 18 is inserted into the flange 10a of the lowermost reinforcing steel plate 10 installed on the slab 6, and the long bolt 18 penetrates the slab 6 and is fixed to the wall surface of the lower floor. 20. The receiving member 20 is made of channel steel that is slightly narrower than the reinforcing steel plate 10, and is fixed to the uppermost position of the wall surface 2 via a plurality of chemical anchors 14 and extends through the upper flange 20a. It connects with the front-end | tip of the shank bolt 18 via a nut.
[0015]
Therefore, in the attached state of each reinforcing steel plate 10, the rib 12a web 12b and the flange 10a of each reinforcing steel plate 10 are assembled into a three-dimensional shape instead of a flat plate shape, and rigidity is imparted by the web 12b and the flange 10a. For this reason, the buckling strength is improved and greater earthquake resistance can be obtained. Further, since the lowermost reinforcing steel plate is connected to the receiving member 20 fixed under the slab, a sufficient supporting force can be obtained even if the beam is not located under the floor slab that receives the reinforcing steel plate. .
[0016]
FIG. 2 shows a second embodiment of the present invention. In this embodiment, each reinforcing steel plate 10 is arranged over the entire surface from the upper part to the lower part of the wall surface 2 of the floor, and the lowermost reinforcing steel sheet 10 on the floor and the uppermost reinforcing steel sheet 10 on the lower floor are slabs. The first embodiment is the same as the first embodiment except that it is connected by a long bolt that penetrates through 6.
[0017]
In this embodiment, since the reinforcing steel plate is attached to the entire wall surface 2, the earthquake resistance is further increased. Moreover, since each reinforcement steel plate is mutually connected also through each floor, it becomes a thing with high support strength.
[0018]
4 and 5 show a third embodiment of the present invention (note that the top view of FIG. 4 shows a case where reinforcing steel plates are provided on both sides, and a side view shows a case where reinforcing steel plates are provided only on one side. Show). In this embodiment, the case where a seismic wall is constructed | assembled using many seismic reinforcement steel plates 30 in the part without an existing reinforced concrete wall is shown. First, the rib members 12 are vertically arranged along the beam 1 at predetermined intervals in the horizontal direction. The rib member 12 is arranged by passing through the slabs 6 on each floor.
[0019]
Thereafter, the reinforcing steel plate 30 is disposed between the flanges 12 a of the rib member 12. The reinforcing steel plate 30 is wider than the above embodiment, and is formed with flanges 30 not only on the upper and lower sides but also on the left and right sides, and is connected to the rib member 12 by the bolt nuts 16 through the bolt holes 30b opened on the left and right sides. To do. The upper and lower flanges 30a are similarly connected to the upper and lower reinforcing steel plates 30 through bolts and nuts 16. Further, the upper and lower floors sandwiching the slab 6 are connected by a long bolt 18.
[0020]
The reinforcing steel plate 30 may be connected only to the front side of the rib member 12 as shown in the side view of FIG. 4, but on the back side of the rib member 12 as shown in the plan view of FIG. 4. In addition, joining the reinforced steel plate 30 further increases the earthquake resistance. In addition, gaps can be filled by grout injection at the joining position of the reinforcing steel plate 30 with the upper and lower slabs 6 and at the contact position between the back surface of the rib member 12 and the beam 1 so that the respective parts can be integrated.
[0021]
Therefore, this embodiment is suitable when a seismic reinforcement wall is newly constructed in a place where there is no existing reinforced concrete wall.
[0022]
【The invention's effect】
As is clear from the above description, according to the seismic reinforcing structure using the seismic reinforcing steel sheet according to the present invention, the reinforcing steel sheet and its mounting structure can be shaped to maintain sufficient rigidity, and a higher seismic effect is obtained. In addition, it is possible to perform construction with as much as possible prevention of work and residence in the building subject to seismic reinforcement. Further, according to the method of the present invention, the support strength can be increased even if the position of the seismic reinforcing steel plate is out of the plane of the beam.
[Brief description of the drawings]
FIG. 1 is a top view, a front view, and a side view according to a first embodiment of the present invention.
FIG. 2 is an enlarged perspective view showing the same part.
FIG. 3 is a top view, a front view, and a side view according to a second embodiment of the present invention.
FIG. 4 is a top view, a front view, and a side view according to a third embodiment of the present invention.
FIG. 5 is an enlarged perspective view showing the same part.
FIG. 6 is a side view showing a conventional mounting structure for earthquake-resistant steel plates.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Beam 2 Wall surface 6 Slab 10, 30 Seismic reinforcement steel plate 10a, 30a Flange 12 Rib material 12a Flange 12b Web 20 Receiving member 16 Bolt nut 18 Long bolt

Claims (5)

A plurality of rib members composed of flanges and webs, such as shaped steel, are vertically arranged between the upper and lower beams or slabs in the existing reinforced concrete structure at predetermined intervals in the transverse direction, and at least two opposite members are provided between the rib members. A seismic reinforcing steel plate having flanges on its sides, the two opposing flanges being horizontal and fixed in multiple stages, and both sides of the seismic reinforcing steel plate are joined to the rib material Seismic reinforcement structure using   The seismic reinforced steel plates are made of groove steel, the seismic reinforced steel plates face each other with their flange portions facing each other, and are connected to each other using bolts and nuts penetrating between the flanges. Seismic reinforcement structure using the described earthquake-resistant steel sheet.   The seismic reinforcing structure using the seismic reinforcing steel plate according to claim 1 or 2, wherein the rib member is a T-shaped steel. A method for mounting the seismic reinforcement steel plate in constructing a seismic reinforcement structure using the seismic reinforcement steel plate according to any one of claims 1 to 3,
With anchoring to the side of lower portion of the upper beams of the earthquake-proof reinforcement steel sheet, perforated floor slab located at the lower end of the steel sheet, by bolts through these holes, and the lower end of the steel plate, the side surface of the upper part of the lower floor beam A method for attaching an earthquake-resistant reinforced steel plate, comprising bolting a reinforcing steel material anchored to a steel plate. A plurality of rib members composed of flanges and webs, such as shaped steel, are vertically arranged between the upper and lower beams or slabs in the existing reinforced concrete structure at predetermined intervals in the transverse direction, and at least two opposite members are provided between the rib members. Seismic strengthening steel plate having flanges on its sides, the two opposing flanges are stacked horizontally and fixed in multiple stages, and both sides of the seismic strengthening steel plate are joined to the rib material Seismic reinforcement method using steel plate.

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