JP2680707B2 - Reinforcement method for concrete structural materials - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for reinforcing a concrete structural material, and in particular, a concrete structure capable of shortening the curing period and ensuring construction in cold regions and during cold weather. Reinforcement method of timber.

《Prior art》 In recent years, in order to compensate for the strength deterioration of existing concrete structures due to aging, etc., high strength fibers such as carbon fibers have been formed on the outer surface of various concrete structural materials that make up the concrete structures. The material is attached to reinforce the structural material. In particular, in order to fully exert the reinforcing function of the fiber material, the resin material such as epoxy is impregnated into the fiber material, the fiber material impregnated with this resin material is attached to the structural material, and then the resin material is cured. I am trying to let you. Resin materials include high-temperature curing type that cures at about 100 ° C and 10 ° C.
There is a room temperature curing type that cures at room temperature up to 30 ° C. When a high temperature curing type resin material is used, it is necessary to raise the temperature to about 100 ° C to cure this resin material, so the concrete of the structural material to which the fiber material is attached deteriorates due to the high temperature. Therefore, a room temperature curing type resin is used as the resin material.

<Problems to be Solved by the Invention> By the way, the above-mentioned room temperature curable resin material has a slower curing rate and a lower temperature, the longer it takes to cure and the longer the curing period is, especially in cold regions. It was not possible to expect a sufficient hardening of the resin material in cold or cold weather, so it was difficult to secure a reliable reinforcing effect for the structural material by adopting the fiber material.

The present invention was devised in view of the above-mentioned problems, and it is possible to ensure a shortening of the curing period, and to reliably perform construction without being affected by the outside temperature even in cold regions or during cold weather. An object of the present invention is to provide a method of reinforcing a concrete structural material that can be used.

<< Means for Solving the Problem >> A reinforcing fiber material is attached to the surface of a concrete structural material via a room temperature curable resin material impregnated therein, and then the concrete structure is attached with the reinforcing fiber material. A heating means is provided so as to face the surface of the material, and the room temperature curable resin material impregnated in the reinforcing fiber material is heated by the heating means.

In addition, reinforcing fiber material on the surface of concrete structural material,
It is affixed via a room temperature curable resin material impregnated in it, then facing the surface of the concrete structural material to which the reinforcing fiber material is affixed, which is bendable and conforms to the outline of the concrete structural material. In addition, a heating means formed of a cloth-like body that can be flexibly deformed is provided, and the room temperature curable resin material impregnated in the reinforcing fiber material is heated by the heating means.

Further, a reinforcing fiber material is attached to the surface of the concrete structural material via a room temperature curable resin material impregnated therein, and then the surface of the concrete structural material to which the reinforcing fiber material is attached is opposed to the surface. A temperature-controllable plate-shaped panel heater is provided, and the plate-shaped panel heater heats the cold-setting resin material impregnated in the reinforcing fiber material.

<< Working >> The operation of the invention of claim 1 will be described. A room temperature curable resin material impregnated into the reinforcing fiber material by a heating means provided facing the surface of the concrete structural material to which the reinforcing fiber material is attached. Is heated and cured.

Further, as in the invention of claim 2, when the heating means is a cloth-like body that is bendable and can be flexibly deformed along the outer contour of the concrete structural material, this cloth-like body is Since it is possible to obtain a free shape, even if the surface of the concrete structural material is not only a flat surface but also a convex surface, it can be easily and appropriately arranged along the external shape, and if necessary. It can be freely installed on the concrete structure material by adhering it to the surface of the concrete structure material or by providing a clearance slightly apart from the surface to efficiently heat and heat the room temperature curing type resin material. Can be made.

On the other hand, if heating is performed by a plate-shaped panel heater capable of controlling temperature as in the third aspect of the invention, temperature management and temperature control such as heating a room temperature curable resin material while maintaining a constant temperature can be performed. Since it can be performed properly, it is possible to ensure high construction quality, manage the curing period, and shorten the construction period.
Furthermore, the panel heater is extremely easy to install, and when repeating the same work on structural materials of the same size,
It can be constructed reasonably and efficiently.

<< Embodiment >> Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a concrete structural material that constitutes an existing concrete structure, in the illustrated example, the outer peripheral surface 1a of the concrete pillar 1 is covered with carbon fiber or the like over the entire circumference to reinforce it. The reinforcing fiber material 2 is attached. The reinforcing fiber material 2 is a room temperature curing type resin material (not shown) such as an epoxy resin, which is hardened to increase the strength of the reinforcing fiber material 2 and enable more sufficient reinforcement of the concrete pillar 1. It is impregnated.

Then, the concrete pillar 1 to which the reinforcing fiber material 2 is attached
Around the circumference of, a heating means is arranged facing the surface 1a of the concrete pillar 1. In this embodiment, the heating means can be freely deformed, such as bent or folded, and can be a cloth-like material such as an electric blanket that can be placed so as to face the entire surface of the concrete pillar 1 while surrounding the concrete pillar 1 along its outer contour. It is composed of body 3.

Regarding the method of supporting the cloth-like body 3, a frame member surrounding the concrete pillar 1 may be constructed by a pipe material or the like so as to be hung on the frame body, or the concrete pillar 1 may be supported by plywood or a heat insulating member 4 described later. A box to be housed may be formed and hung on the box, or an anchor member or the like may be driven into the concrete column 1 so as to be hooked on these anchor members, or the concrete column 1 may be covered with the cloth-like body 3. You may make it tie directly to the concrete pillar 1 with a case or a string from the outside.

Since the cloth-like body 3 as the heating means of the present embodiment can obtain a free shape, even if the surface 1a of the concrete pillar 1 arranged to face is a flat surface or another convex surface, its outer shape Can be easily arranged along the surface of the concrete pillar 1 and can be closely attached to the surface 1a of the concrete column 1 if necessary. When they are brought into close contact with each other, the gap between the cloth 3 and the surface 1a of the concrete column 1 can be reduced due to the flexible deformation of the cloth 3, so that heat can be prevented from escaping from the gap and the efficiency can be increased directly and efficiently. It can be heated and heated well. In this way, it is preferable to install the cloth-like body 3 in close contact with the surface 1a of the concrete column 1 in terms of heating and temperature loss, and economically and shortening the curing period. However,
In a molten state where no film is formed on the surface layer of the resin material, the resin material adheres to the cloth-like body 3 that adheres the cloth-like body 3 to the surface 1a of the concrete pillar 1 or the volatile component generated from the resin material In such a state, the cloth-like body 3 should be attached to the surface of the concrete pillar 1 because it cannot be smoothly released.
It is preferable to provide a clearance slightly apart from 1a.

Furthermore, if an electric blanket or the like is used as the heating means for the cloth-like body 3, a thermostat or the like may be used, or a temperature sensor or the like may be installed separately in the vicinity of the concrete column 1 to perform temperature management and temperature control. Therefore, the resin material can be uniformly heated while maintaining a constant temperature. Therefore, it is possible to cure the resin material uniformly and ensure high quality, and it is easy to grasp the curing end time, and it is possible to eliminate the need for a margin in the curing period and to shorten the construction period. You can

On the other hand, when the concrete pillar 1 is surrounded by the cloth-like body 3, it is preferable that the concrete pillars 1 are arranged so that the ends of the cloth-like body 3 overlap each other (see FIG. 1, R). If you do this,
The resin material can be uniformly heated and cured over the entire surface of the concrete column 1 without being affected by the uneven temperature distribution between the end portion and the central portion of the cloth-like body 3. Therefore, when it is not possible to surround the entire concrete pillar 1 while securing a wrap with a single cloth-like body 3, a plurality of cloth-like bodies 3 may be used.

Next, on the outside of the cloth-like body 3, a cylindrical heat insulating member 4 is provided so as to surround the whole so as to be shielded from the outside. This heat insulating member 4 ensures economic efficiency by preventing heat dissipation and shortens the temperature rising time to secure a shortening of the curing period, and further suppresses the influence of external disturbances such as outside air temperature and wind to prevent damage to the concrete columns. The surface 1a of No. 1 can be maintained at a uniform and constant temperature. As the material of the heat insulating member 4, glass wool having high heat resistance, styrene, or the like that exhibits a sufficient heat insulating effect even when wet, is adopted.

Regarding attachment of the cloth-like body 3 described above, a cylindrical heat insulating member 4 may be used as shown in FIG. That is, for example, the end portions of the respective cloth-like bodies 3 may be sandwiched between the joint edges 4b of the four plate-like heat insulating materials 4a constituting the tubular body.

When the preparation is completed as described above, the cloth-like body 3 may be heated to heat the concrete pillar 1 and, by extension, the resin material to cure it.

FIG. 3 shows another embodiment. In this embodiment, instead of the cloth-like body 3 described above, a plate-shaped panel heater 5 which is assembled in a tubular shape and whose temperature is controllable is employed as the heating means. Sealing material 6 is attached to the joint of the panel heater 5.
Is filled to prevent heat radiation from the joint. As the material of the sealing material 6, it is preferable to use glass wool or the like having high heat resistance in consideration of the temperature rise, thermal deformation, and the like. Other configurations and operations are similar to those of the above-described embodiment. Particularly, in this embodiment, since it is sufficient to simply combine the plate-shaped panel heaters 5 with each other, the installation work is extremely easy, and the construction work can be performed efficiently when the same work is repeated on the structural material of the same size. You can

FIG. 4 shows the application to the floor slab 7 or the beam using the panel heater 5.

As shown in FIG. 4, a concrete structural material that constitutes an existing concrete structure, in the illustrated example, a floor slab 7
A reinforcing fiber material 2 such as carbon fiber is attached to the lower surface 7a of the entire surface to reinforce the lower surface 7a. The reinforcing fiber material 2 is impregnated with a room temperature curable resin material similar to that described above. Next, the lower surface of the floor slab 7 to which the reinforcing fiber material 2 is attached
A panel heater 5 is arranged below 7a so as to face the lower surface 7a of the floor slab 7. Finally, if the panel heater 5 is heated to heat the floor slab 7, and thus the resin material, to cure it, a reinforcing effect can be obtained by the same action as described above.

<< Effects of the Invention >> In short, according to the present invention, the following excellent effects are exhibited.

In the invention of claim 1, the temperature around the fiber material is relatively increased by the heating means provided so as to face the surface of the concrete structural material to which the reinforcing fiber material is attached, thereby promoting the curing of the room temperature curable resin material. Therefore, it is possible to shorten the curing period and secure construction in cold regions or during cold weather. Further, since the heating means is simply installed, it is economical and the construction is easy.

Further, according to the invention of claim 2, since the heating means is a cloth-like body which is bendable and can be flexibly deformed along the outer contour of the concrete structural material, the cloth-like body is free to be heated. Even if the shape can be obtained and the surface of the concrete structural material is not only a flat surface but also a convex surface, etc., it can be easily and appropriately arranged along the outer shape, and when necessary. Can be freely installed on the concrete structural material by adhering to the surface of the concrete structural material or by providing a clearance slightly apart from the surface, and efficiently heating and raising the temperature of the room temperature curable resin material. You can

On the other hand, in the invention of claim 3, since the plate-shaped panel heater capable of temperature control is used for heating, temperature management and temperature control are appropriately performed, for example, by heating the room temperature curable resin material while maintaining a constant temperature. It is possible to do this, it is possible to ensure high construction quality, and it is possible to manage the curing period to shorten the construction period. Furthermore, the panel heater is extremely easy to install,
When the same work is repeated on structural materials of the same size, it can be installed reasonably and efficiently.

In any of the above-mentioned inventions, a room temperature curable resin material, which may be cured at an air temperature, may require time for curing, or may not be able to guarantee sufficient curing. As a target, reliable curing can be guaranteed in the short time.

[Brief description of the drawings]

1 is a plan sectional view showing a preferred embodiment of the present invention, FIG. 2 is a partial plan sectional view showing another embodiment of the present invention, and FIG.
FIG. 4 is a plan sectional view showing still another embodiment of the present invention, and FIG. 4 is a side sectional view showing another application example of the present invention. 1,7 …… Concrete structural materials (concrete columns, floor slabs) 2 …… Reinforcing fiber materials 3,5 …… Heating means (cloths, panel heaters)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 63-14945 (JP, A) JP 62-55372 (JP, A) JP 63-128689 (JP, U)

Claims (3)

(57) [Claims] A reinforcing fiber material is attached to the surface of a concrete structural material via a room temperature curable resin material impregnated therein, and then the surface of the concrete structural material to which the reinforcing fiber material is attached. A method for reinforcing a concrete structural material, characterized in that heating means are provided so as to face each other, and the room temperature curable resin material impregnated in the reinforcing fiber material is heated by the heating means. 2. A reinforcing fiber material is attached to the surface of a concrete structural material via a room temperature curable resin material impregnated therein, and then to the surface of the concrete structural material to which the reinforcing fiber material is attached. The heating means is provided so as to be opposed to each other, and is made of a cloth-like body that can be bent and can be flexibly deformed along the outer contour of the concrete structural material, and the normal temperature impregnated into the reinforcing fiber material by the heating means. A method for reinforcing a concrete structural material, characterized in that a curable resin material is heated. 3. A reinforcing fiber material is attached to the surface of a concrete structural material via a room temperature curable resin material impregnated therein, and then to the surface of the concrete structural material to which the reinforcing fiber material is attached. A concrete structural material, characterized in that plate-shaped panel heaters capable of temperature control are provided so as to face each other, and the room-temperature curable resin material impregnated in the reinforcing fiber material is heated by the plate-shaped panel heater. Reinforcement method.