JP3755115B2 - Reinforcing existing pillars - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for reinforcing an existing pillar.
[0002]
[Prior art]
It is effective to reinforce the pillars of buildings as a means to improve the earthquake resistance of existing RC structures.
As a method for that purpose, a method is adopted in which an iron plate or carbon fiber is wound around the pillar as a shear reinforcement to restrain the concrete of the pillar to enhance toughness and improve seismic performance.
[0003]
[Problems to be solved by the present invention]
The conventional methods for reinforcing existing pillars as described above have the following problems.
<A> A method of winding an iron plate is a method of assembling an iron plate that has been divided and processed into a column shape in advance and joining the same by welding.
For this reason, sparks fly around and damage the interior material, and in some cases there is a concern of fire. In addition, there are cases where the neighborhood is burnt and contaminated by the generation of smoke, and there are many problems especially in the case of buildings in use.
Also, welding requires a skilled person with a certain qualification, and the work is restricted.
<B> There is a method of fastening with a bolt regardless of welding, but this method requires a finishing work for covering the head of the bolt.
Therefore, the work man-hours increase, and at the same time, the work time increases.
<C> In the method of winding the carbon fiber, it is necessary to perform a column base treatment before the attachment, and extra work is generated.
In addition, it takes days for the base treatment, drying after attaching the carbon fiber, and subsequent finishing treatment. For this reason, there are many disadvantages in practice, such as hindering the use of buildings.
[0004]
The present invention has been made to solve the above-described conventional problems, and does not require skill or special equipment such as welding work, and can reinforce existing columns with simple work. It aims at providing the reinforcement method of a pillar.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the existing column reinforcing method of the present invention has an inner shape slightly larger than the outer shape of the column to be reinforced, and the outer shape of the column to be reinforced is divided into a plurality of shapes. By forming a reinforcing frame with the steel plate in the state and a concrete plate attached to the outer periphery of the iron plate, placing the reinforcing frame on the outer periphery of the target column, and connecting the ends of the iron plate of the reinforcing frame with bolts The method of reinforcing an existing column is to surround the lower part of the outer periphery of the column with a reinforcing cylinder, sequentially stack the reinforcing cylinder on the upper stage to surround the column, and then inject a curing agent between the column and the reinforcing cylinder. It is characterized by.
[0006]
[Embodiments of the present invention]
Hereinafter, embodiments of the reinforcing method for existing pillars of the present invention will be described in detail with reference to the drawings.
[0007]
<I> Overall configuration.
The reinforcing method of the present invention is a method in which the existing column c is surrounded by the reinforcing cylinder 2 and a curing agent is injected into the inside thereof.
The reinforcing cylinder 2 surrounding the column c is configured by combining a plurality of divided reinforcing frames 1.
[0008]
<B> Reinforcing frame 1.
The reinforcing frame 1 is constituted by an inner shear reinforcing iron plate 11 and a concrete plate 12 located outside the reinforcing steel plate 11.
The inner iron plate 11 is an iron plate for shear reinforcement, is a plate body that has an inner shape that is slightly larger than the outer shape of the column c to be reinforced, and is divided into a plurality of outer shapes of the target column c. .
A concrete plate 12 is attached to the outer periphery of the shear reinforcing iron plate 11 to form the reinforcing frame 1. In order to securely integrate the inner shear reinforcing iron plate 11 and the outer peripheral concrete plate 12, a reinforcing bar or the like is protruded from the outer side of the shear reinforcing iron plate 11 and embedded in the concrete plate 12.
[0009]
Both ends of the concrete plate 12 are formed shorter than the shear reinforcing iron plate 11. Therefore, the steel plate 11 for shear reinforcement is exposed as the protruding side 11a at both ends of the reinforcing frame 1.
Bolt holes 11b are opened in the protruding sides 11a.
Further, the height of the steel plate for shear reinforcement is formed to be lower than the height of the concrete plate so that the mortar can wrap around.
[0010]
The reinforcing frame 1 constituting the reinforcing cylinder 2 can be reinforced by surrounding the periphery of the rectangular column c by forming its planar shape in a U shape.
If the planar shape of the reinforcing frame 1 is formed in an arc shape, the periphery of the circular column c can be surrounded and reinforced.
[0011]
<C> Arrangement of the reinforcing frame 1.
In the embodiment of the drawings, a case where the reinforcing frame 1 having a U-shaped planar shape is used for a rectangular column c will be described.
The reinforcing frame 1 having the above-described configuration is disposed on the outer periphery of the target column c.
Since the protruding side 11a of the steel plate 11 for shear reinforcement is exposed from the concrete plate 12 at the end of the reinforcing frame 1, the protruding side 11a is disposed in a state of abutting as shown in FIG.
If the attachment plate 11c is attached to both surfaces of the protruding side 11a in the butted state and fastened with bolts 11d, the two reinforcing frames 1 are easily integrated. (Fig. 8)
As a result, as shown in FIG. 2, the reinforcing cylinder 2 surrounding the column c can be configured. In the present specification, the expression “cylinder” is not limited to a circular cylinder. The term “cylinder” is used to mean a member surrounding the column c having a rectangular shape, a circular shape, a polygonal shape, an elliptical shape, or other shapes.
[0012]
<D> Stacking of the reinforcing cylinders 2
When the lower end of the outer periphery of the column c is surrounded by the reinforcing cylinder 2 by connecting the ends of the steel plate 11 for shear reinforcement of the reinforcing frame 1 with bolts, the reinforcing cylinder 2 is sequentially stacked on the upper stage to surround the column c.
In this way, the reinforcing cylinders 2 are sequentially stacked, and when the column c is surrounded to the position of the beam, the stacking is finished. (Fig. 6)
[0013]
<E> Injection of curing agent.
Some space is interposed between the inner surface of the reinforcing cylinder 2 and the outer surface of the column c.
At this interval, a curing agent such as mortar is injected. For this injection, an injection port is opened in the reinforcing frame 1 arranged in the lower stage.
The mortar is poured up to the upper end of the reinforcing cylinder 2.
As shown in FIG. 9, a method of injecting mortar or the like by applying a mold plate 11e as shown in FIG. 9 or a method of attaching a cover plate can be adopted outside the protruding side 11a.
In this case, since the height of the steel plate 11 for shear reinforcement is formed lower than the height of the concrete plate 12, the mortar filled inside wraps around to the outside at the joint portion, and the protruding side 11a is outside on the inside. Will also be filled with mortar.
The hardening agent may not be filled after the installation of the reinforcing cylinder 2 at the entire height of the column c, but may be filled each time the reinforcing cylinder 2 is completed in one stage.
[0014]
<F> Another embodiment.
In the above example, the case where the reinforcing cylinder 2 is divided into a plurality in the height direction of the column c has been described.
However, depending on the size of the column c, or depending on the weight of the reinforcing cylinder 2 and ease of handling, a configuration that does not divide in the height direction may be employed.
[0015]
In the example of the drawing, the case where the entire height of the column c is surrounded from the floor portion of the column c to the position of the beam has been described.
However, it is also possible to adopt a method of surrounding and reinforcing not the total height but the middle position of the column c.
[0016]
In the embodiment shown in the figure, the case where the entire circumference of the independent column c is surrounded has been described.
However, even when a wall or the like is continuous with a part of the column c, the same reinforcing method can be performed by surrounding the periphery without the wall portion.
[0017]
In the illustrated embodiment, the U-shaped reinforcing frame 1 obtained by dividing a rectangle into two parts has been described. However, the same reinforcing method can be implemented even if the reinforcing frame 1 divided into a plurality of pieces is used, not limited to two.
[0018]
[Effect of the present invention]
Since the method for reinforcing an existing pillar according to the present invention is as described above, the following effects can be obtained.
<A> It is a method of reinforcing the pillar by using the reinforcing frame 1 whose sectional shape is divided into a plurality of parts.
Therefore, since the weight and dimension of one reinforcing frame 1 can be freely set, a special device is not required for operations such as transportation and assembly, and the operation can be easily performed.
<B> When the reinforcing cylinder 2 is configured, it can be performed by bolt joining.
Therefore, it does not require special skills and equipment as in the case of welding, and is simple. Since fire and heat are not used at the same time, it does not affect surrounding interior materials.
<C> Since the reinforcing frames divided into a plurality of parts are assembled, the steel plates for shear reinforcement are joined at the same level. Therefore, the joining operation is extremely easy as compared with the case of continuous operation.
<D> The height of the steel plate for shear reinforcement is shorter than the height of the concrete plate. For this reason, the inner and outer mortars are continuously integrated at the joint. Therefore, generation of cracks or peeling of the mortar surface outside the joint is unlikely to occur. Furthermore, the electrical wiring etc. which are embed | buried under the existing pillar can be performed using the space | interval of the upper and lower sides of a junction part.
<E> The steel plate for shear reinforcement is formed integrally with the concrete plate, and is further integrated with the filling mortar at the joint. Accordingly, the finished thickness can be reduced as compared with the case where only the shear reinforcing steel plate is fastened with bolts, and the work process can be shortened since there is no need to attach the board to the outside.
<F> Filling the mortar does not require reinforcement such as a column clamp because the reinforcing frame has higher rigidity than the case of using only the reinforcing iron plate.
<G> Compared with the method of winding and reinforcing the carbon fiber, the work process and the required number of days can be greatly shortened, and the economic effect is great.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of a reinforcing frame used in the reinforcing method of an existing column according to the present invention. FIG. 2 is an explanatory diagram of a reinforcing cylinder combined with the reinforcing frame. FIG. 4 is an explanatory diagram of the construction sequence of the reinforcement method. FIG. 5 is an explanatory diagram of the construction sequence of the reinforcement method. FIG. 6 is an explanatory diagram of the construction sequence of the reinforcement method. [Explanation of the joint part of the reinforcing frame] [FIG.

Claims (5)

An iron plate for shear reinforcement having an inner shape that is slightly larger than the outer shape of the column to be reinforced, and the outer shape of the column to be reinforced is divided into a plurality of shapes;
A reinforcement frame is formed with a concrete plate attached to the outer periphery of the steel plate for shear reinforcement,
Place this reinforcement frame on the outer periphery of the target column,
By connecting the ends of the steel plate for shear reinforcement of the reinforcing frame with bolts, the lower part of the outer periphery of the column is surrounded by a reinforcing cylinder,
Sequentially pile up reinforcing cylinders on the top to surround the pillar,
After that, a curing agent is injected between the column and the reinforcing cylinder,
Reinforcing existing pillars It has a slightly larger inner shape than the outer shape of the pillar to be reinforced, and the outer shape of the pillar to be reinforced is divided into a plurality of parts,
Furthermore, the steel plate for shear reinforcement in a state divided into a plurality in the height direction,
A reinforcement frame is formed with a concrete plate attached to the outer periphery of the steel plate for shear reinforcement,
Place this reinforcement frame on the outer periphery of the target column,
By connecting the ends of the steel plate for shear reinforcement of the reinforcing frame with bolts, the lower part of the outer periphery of the column is surrounded by a reinforcing cylinder,
Sequentially pile up reinforcing cylinders on the upper stage to surround the pillar to the position of the beam,
After that, a curing agent is injected between the column and the reinforcing cylinder,
Reinforcing existing pillars Reinforcing frame that constitutes the reinforcing cylinder by combining,
Formed in a U-shape,
The reinforcing method of the existing pillar of Claim 1, 2 Reinforcing frame that constitutes the reinforcing cylinder by combining,
It is formed in an arc shape,
The reinforcing method of the existing pillar of Claim 1, 2 The height of the steel plate for shear reinforcement of the reinforcement frame is
Formed below the height of the concrete board,
The reinforcing method of the existing pillar of Claim 1, 2

Images