JP2001254519A - Reinforcing construction and reinforcing method using steel plate with joint bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method having a good shear strength a reinforcing construction capable of realizing a toughness during fracture and a reinforcing work hardly generating dust and noise during reinforcing work. SOLUTION: This reinforcing construction is equipped with a joint unit 10 comprising a reinforcing bar 12 projected out to one of the surface of a steel plate 11, the steel plate is adhered to an existing column 20 and to the surface of an existing beam 21 and the reinforcing bar is embedded inside an added wall 25 in configuration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure and a reinforcing method in which an additional portion such as a wall is provided at a location surrounded by columns and beams of an existing structure.

[0002]

2. Description of the Related Art As a reinforcement structure of an existing frame including columns and beams, a reinforcement structure in which walls and braces are added to the frame is known. Such additional walls and additional braces are effective as a means of seismic reinforcement, but it is relatively difficult to secure shear strength and toughness at the joint with the existing frame, and this is one of the issues with the reinforcement structure. I have. In order to solve such a problem, a structure of a joint using a cotter in FIG. 4 or an anchor in FIG. 5 has been conventionally proposed.

FIGS. 4A and 4B are cross-sectional views of a joint using a cotter 52. In this joint, a precast concrete cotter 52 is attached to the surface of an existing beam 50 with an adhesive. Reinforcing bars 53 are erected in the area surrounded by the existing beams 50 and the columns, and concrete is cast into the cotters 52.
Is embedded in the inside to ensure the shear strength between the additional wall 51 and the existing frame.

FIG. 5 is a cross-sectional view of a joint using an anchor 55. In this joint, a joint 56 is connected to the anchor 55 driven into the existing beam 50, and the reinforcing bar 53 is connected similarly to FIG. The concrete is erected and cast, and the anchor 55 and the joint 56 are buried in the concrete to secure the shear strength and toughness.

[0005]

However, in the reinforcing structure using the cotter 52, if an excessive shear force acts on the joint, the cotter 52 itself will be sheared, and the joint will collapse without stickiness. However, there is a defect that shows a brittle fracture state. Also anchor 55
In the case of using, it is necessary to pierce the frame of the existing frame with a drill, and dust and noise are generated during the piercing operation, and it is very difficult to apply the method to a structure in use.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reinforcing structure and a reinforcing method capable of not only generating little dust and noise during the reinforcing work, and exhibiting not only good shear strength but also toughness at the time of fracture. is there.

[0007]

According to the present invention, there is provided a reinforcing structure in which an extension such as a wall is provided at a location surrounded by columns and beams of an existing structure. A steel plate attached to the surface of the existing beam, and a steel shaft member having one end fixed to the steel plate and protruding toward the extension portion, wherein the extension portion is constructed from the surface of the steel plate and There is provided a reinforcing structure characterized by having a shaft member embedded therein.

The additional portion may be formed by using a hardening material such as concrete or mortar. For example, the additional portion may include a brace, a wall, or an additional portion obtained by combining these members. What is necessary is just to be able to embed the shaft member in the curable material. Further, the steel shaft member can be constituted by, for example, a reinforcing bar or a stud.

Further, according to the present invention, there is provided a reinforcing method for providing an additional portion such as a wall at a location surrounded by columns and beams of an existing structure, wherein a reinforcing bar is protruded from one surface of a steel plate. A reinforcing method is provided in which a unit is attached to a surface of an existing column and an existing beam, and an additional portion such as a wall is constructed so as to embed a reinforcing bar of the joining unit inside.

[0010] Here, in the joining unit, a reinforcing bar is protruded only on one surface of the steel plate, while the other surface is flat so as not to impair the function as a bonding surface to the beam. Is preferred.

[0011]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1A shows a reinforcing structure according to the present invention, in which the right half is a front view, the left half is a cross-sectional view, and FIG. 1B is a cross-sectional view around a beam 21. This is applied to a frame-less frame portion composed of columns 20 and beams 21 of a structure. The reinforcement structure is
It is characterized by using a joining unit 10 as shown in the perspective view of FIG. 3, and this joining unit 10 bends a reinforcing bar 12 at a substantially right angle and makes one end 11a of a steel plate 11 a fixing end 12b. And the other end is provided as a projecting end 12a so as to project substantially perpendicularly from the steel plate 11. Here, in the joining unit 10 of FIG. 3, the fixing ends 12b are arranged so as to be linearly arranged. However, if the protruding ends 12a are protruded from the steel plate 11 at a predetermined density, the arrangement of the fixing ends 12b is particularly illustrated. It is not limited to the third embodiment.

The reinforcement structure shown in FIGS. 1 (a) and 1 (b) has a structure in which a plurality of joining units 10 are adhered to the surfaces of columns 20 and beams 21 at a predetermined interval with an adhesive 15, and a vertical member 23 of H-section steel and a horizontal member 23 are attached. A brace is constructed by fixing a member 22 to a column 20 and a beam 21, respectively, and further fixing an H-shaped steel diagonal member 24 to a vertical member 23 and a horizontal member 22. In such a reinforcing structure, as shown in FIG.
A hardening filler 22b such as mortar is injected between the flanges of the shaped steel 22a, and the reinforcing bar 1
By embedding 2 in the filler 22b, the frame of the column and beam and the brace are integrated. The reinforcing bars 12 are appropriately adjusted in diameter, the number of reinforcing bars, the length of the protruding end 12a, and the like so that the shear strength is not more than the shear strength due to the adhesion between the steel plate 11 of the joining unit 10 and the beam-column surface. Provide.

FIG. 2 shows a reinforcing structure by the additional wall 25. FIG. 2 (a) is a sectional view of the right half, a front view is the left half, and FIG. 2 (b) is a sectional view around the beam 21. here,
The reinforcing structure includes a plurality of joint units 10 that are arranged at predetermined intervals on pillars 2.
0 and the surface of the beam 21 with the adhesive 15
a and 25b are erected, concrete is cast, and an additional wall 25 is constructed. In such a reinforcement structure,
By embedding the reinforcing bar 12 of the joining unit 10 in the concrete of the additional wall 25, the column-beam frame and the additional wall 25 are integrated. In addition, the diameter, the number, the length of the protruding end, and the like of the reinforcing bars 12 of the joining unit 10 are determined in consideration of the shear strength as in the embodiment of FIG.

In the reinforcing structure shown in FIGS. 1 and 2, when an excessive shear force acts on the brace and the additional wall 25, the reinforcing bar 12 of the joining unit 10 is broken while being plastically deformed. It exhibits tough fracture characteristics and can prevent brittle destruction such as a fracture of the joint surface between the steel plate 11 of the joining unit 10 and the brace or the additional wall 25-column beam.

Next, the reinforcing method according to the present invention will be described with reference to an example in which an extension portion is formed of a wall. Multiple reinforcing bars 12
Unit 10 formed by projecting one side of steel plate 11
Are prepared in advance, and this joining unit 10
Is adhered to the surfaces of the existing columns 20 and the existing beams 21 at predetermined intervals by the adhesive 15. Next, existing pillar 20 and existing beam 2
Reinforcing bars 25a and a formwork (not shown) are erected in the area surrounded by 1 and concrete is poured. After the concrete has hardened, the mold is removed and the extension is completed.

[0016]

According to the present invention, a steel plate attached to the surface of an existing column and an existing beam, and a reinforcing bar having one end fixed to the steel plate and projecting toward an additional portion such as a wall or a brace are provided. Since the beam and beam are buried in the extension and integrated with the existing frame, if excessive shearing force acts on the extension, the reinforcing bars will plastically deform and show tough fracture characteristics .

According to the present invention, an extension unit integrated with an existing frame can be constructed only by sticking a joining unit formed by projecting a reinforcing bar on one surface of a steel plate to the surface of an existing column beam. Unlike the conventional reinforcement structure, there is no need for work that generates dust and noise, such as drilling of the body with a drill,
Reinforcement of structures where residents are located can now be done comfortably. Furthermore, since the joining unit in the present invention is lighter than a conventional cotter, good workability can be obtained.

[Brief description of the drawings]

FIG. 1 is a reinforcement structure of an additional brace of the present invention, in which (a) is a front view of a right half and a cross-sectional view of a left half,
(B) is sectional drawing around a beam.

FIG. 2 is a reinforcement structure using an additional wall according to the present invention,
In (a), the right half is a sectional view, the left half is a front view,
(B) is sectional drawing around a beam.

FIG. 3 is a perspective view of a joining unit used in the present invention.

FIGS. 4A and 4B are cross-sectional views showing a conventional example.

FIG. 5 is a sectional view showing a conventional example different from FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joining unit 11 Steel plate 12 Reinforcing bar 20 Existing column 21 Existing beam 22 Cross member (extension part) 23 Vertical member (extension part) 24 Diagonal member (extension part) 25 Extension wall (extension part)

Claims (2)

[Claims] 1. A reinforcing structure in which an additional portion such as a wall is provided at a location surrounded by columns and beams of an existing structure, wherein the reinforcing structure comprises a steel plate adhered to the surfaces of the existing columns and the existing beams. And a steel shaft member having one end fixed to the steel plate and protruding toward the additional portion, wherein the additional portion is constructed from the surface of the steel plate and the steel shaft member is embedded therein. Reinforcement structure characterized by. 2. A reinforcing method for providing an additional portion such as a wall at a location surrounded by columns and beams of an existing structure, wherein the joining unit is formed by projecting a steel shaft member on one surface of a steel plate. A reinforcing method characterized in that it is attached to the surface of an existing column and an existing beam, and an additional portion such as a wall is constructed so that a steel shaft member of the joining unit is embedded inside.