JP2000213176A - Method for reinforcing surface of existing concrete material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for protecting a concrete material which can be executed simply and enables complete prevention of penetration of rainwater or the like. SOLUTION: A form material 3 is provided at a prescribed distance from a reinforcement object surface 2 of an existing concrete material 1 and a reinforcing filler of curing properties is cast into a gap formed between the existing concrete material 1 and the form material. After the reinforcing filler is cured, the form material is removed and thereby a reinforcing layer 4 is laminated on the reinforcement object surface 2. In this method for reinforcing the surface of the existing concrete material 1, a reinforcing layer 4 is formed on the surface of the form material opposite to the reinforcement object surface 2 by providing thereon a reinforcing material constituted of reinforcing fibers and a resin adhesive and, after the reinforcing filler is cast in, the form material 3 is removed. Thereby a reinforcing layer 8 covered with the reinforcing layer 4 is laminated on the reinforcement object surface 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reinforcing and repairing the surface of an existing concrete material of a building, a structure or the like.

[0002]

2. Description of the Related Art In order to respond to aging and demands for increased strength, it is necessary to repair or reinforce existing concrete materials afterwards. Various technologies have been proposed and actually used to meet such a need. One of them is the following technology.

[0003] This is because a mold material is installed at a predetermined distance from a surface to be reinforced of an existing concrete material, and a hardening reinforcing material is poured into a gap formed between the existing concrete material and the mold material, and the reinforcing material is filled. This is a technique in which the surface of an existing concrete material is reinforced by stacking a reinforcing layer on the surface to be reinforced by removing the mold after the material is cured. This technique is a general technique because it is relatively easy to reinforce an existing concrete material and it is possible to make the surface finish beautiful to some extent.

By the way, in this technique, cement mortar is mainly used as a filler, and the above technique is, in short, limited to increasing the thickness of the existing concrete surface. However, the thickness of the reinforcing layer formed on the surface to be reinforced is not always uniform over the entire surface, and the occurrence of cracks is observed on the surface of the reinforcing surface after removing the mold material due to the uneven thickness. There is. The occurrence of such cracks is a cause that the intended reinforcement strength cannot be obtained, and the penetration of rainwater or air from these cracks does not sufficiently prevent the corrosion of the reinforcing steel inside the existing concrete material. Therefore, it can be said that the above technique still has points to be improved. In order to reinforce existing concrete materials, the method of once shaving the surface to be reinforced with a certain thickness and using the newly appearing surface as the surface to be reinforced and implementing the above-mentioned reinforcing technology has also been adopted. In particular, when the method is adopted, it is often not possible to secure a sufficient thickness of the existing concrete material that covers the internal reinforcing steel. The possibility that cracks will occur in the corresponding reinforcing layer is increased, and the above-mentioned problems are more likely to appear.

[0005] In order to solve such a problem in the prior art, a mold material in which a water-impermeable sheet is previously adhered to its inner surface is used, and a gap between the mold material and the concrete material to be reinforced is filled. A technique has been attempted in which a material is poured and a reinforcing layer whose surface is covered with a water-impermeable sheet and which is integrated with the sheet is laminated on the surface to be reinforced. According to this technique, it is possible to reduce the possibility of cracks occurring in the reinforcing layer, and even if cracks occur, it is possible to prevent rainwater or the like from penetrating into the reinforcing layer due to the presence of the impermeable sheet. Therefore, certain effects can be obtained. However, in this technique, it is troublesome to prepare the above-described mold material in advance, and there is an inconvenience that it is difficult to flexibly cope with a case where the shape of the mold material is to be changed on site. In this technology, it is important to integrate the mold material and the sheet material. However, there is a difference in the material between the sheet material and the concrete material. It is even possible that peeling occurs. Furthermore, in the above-mentioned technique, since the reinforcing layer is slightly exposed at the joint portion where the mold members come into contact with each other, it is difficult to say that the internal concrete material can be completely protected.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned disadvantages in the prior art, and has been developed in consideration of a concrete material which can be easily implemented and which can completely prevent penetration of rainwater and the like. It does not provide a method of protection.

[0007]

Means for Solving the Problems According to the invention of the present application made to achieve the above object, the present invention relates to a method of installing a shape member at a predetermined distance from a surface to be reinforced of an existing concrete material, and The method is based on the method of reinforcing the surface of an existing concrete material by laminating a reinforcing layer on the surface to be reinforced by pouring a hardening reinforcing filler into the gap formed between them and removing the mold after the reinforcing filler has hardened. And Then, on the surface of the mold material opposite to the surface to be reinforced, a reinforcement layer is formed by applying a reinforcement material composed of a reinforcing fiber and a resin adhesive, and then, after removing the mold material by pouring the reinforcing filler, A reinforcing layer covered with a reinforcing layer is laminated on a surface to be reinforced.

A feature of this method is that a reinforcing material made of a reinforcing fiber and a resin adhesive is applied to the surface of the mold member facing the surface to be reinforced. In other words, in this method of reinforcing the surface of the existing concrete material, the reinforcing material after drying and curing becomes an impermeable layer covering the surface of the reinforcing layer, thereby preventing rainwater and the like from entering the reinforcing layer and the existing concrete material. Become. Here, since the formation of the reinforcing layer is sufficient if performed in the field, according to the method of the present invention, the surface can be covered with the water-impermeable layer without preparing the sheet material to which the sheet is attached in advance. It is possible to easily obtain a reinforced reinforcing layer. Further, in this method, since the reinforcing layer is formed by applying the reinforcing material to the surface of the mold material opposite to the surface to be reinforced, it is very easy to cope with the shape change of the mold material even if it is changed. . Further, in this method of reinforcing the surface of the existing concrete material, a portion of the surface of the reinforcing layer at the seam portion of the mold material where the reinforcing layer is not provided is provided with the reinforcing material after removing the mold material, thereby providing a series of seamless reinforcement. A layer can be formed. Therefore,
Since the finally obtained reinforcing layer can be uniformly covered with a seamless reinforcing layer over the entire surface, the waterproofing effect and the aesthetic appearance are excellent.

Here, the reinforcing material contains the reinforcing fiber and the resin adhesive as described above. Originally, the reinforcing layer can be formed by using only the resin adhesive alone. However, the strength of the finally formed reinforcing layer can be further increased by adding reinforcing fibers to the reinforcing layer. The reinforcing fiber is not particularly limited as long as it has strength for reinforcement, and for example, glass fiber, carbon fiber, aramid fiber, vinylon fiber, metal fiber, or the like can be used. As the adhesive, any adhesive may be used as long as it has good adhesiveness with the filler. For example, a two-pack type resin such as an epoxy resin, a polyester resin, or a urethane resin, an acrylic resin, and a solvent-based resin may be used. One-part resin such as resin,
Alternatively, pommer cement or the like can be used.

In this technique, as described above, the reinforcing layer is formed of a reinforcing material comprising a reinforcing fiber and a resin adhesive. Specifically, the reinforcing layer can be formed by the following method. That is, the reinforcing layer formed by kneading the chopped reinforcing fibers and the resin adhesive is applied to the surface of the mold member facing the surface to be reinforced, whereby the reinforcing layer can be formed. In this method, since the reinforcing layer can be formed by applying the reinforcing material in the form of a paste, even if the shape of the mold material is changed, it can be very flexibly dealt with without any difficulty. On the other hand, it is also possible to form a reinforcing layer by attaching a reinforcing material obtained by impregnating reinforcing fibers woven in a mesh shape into a resin adhesive to a surface of a mold member facing a surface to be reinforced. This method is slightly inferior to the deformation of the mold material as compared with the case where chopped reinforcing fibers are used, but is superior in that a reinforcing layer having high tensile strength can be obtained.

As described above, in the present invention, the reinforcing layer is formed in advance on the mold material, thereby obtaining various advantages. By pouring a reinforcing filler (preferably adhesive) into the layer, it is possible to obtain an advantage that the bonding between the reinforcing layers can be further strengthened. However, the problem of the strength of the bond between the reinforcing layer and the reinforcing layer is largely due to the compatibility between the reinforcing filler and the reinforcing material. If the reinforcing filler is poured before the reinforcing material is dried, the bonding may be lost. Although it is certain that the reinforcing material becomes stronger, it is a matter of course that a sufficiently strong bond may be obtained even when the reinforcing filler is poured after the reinforcing material is dried. The bonding between the reinforcing layer and the reinforcing layer obtained according to the present invention becomes stronger due to the above-mentioned circumstances, but a stronger bonding can be obtained by employing the following method. That is, the reinforcement layer is formed on the surface of the mold member opposite to the surface to be reinforced, and the anchor body is held on the reinforcement layer by arranging the anchor body on the surface of the reinforcement layer before the reinforcement layer is dried. The filler is poured. This prevents the anchor body bonded to the reinforcing layer from falling off from the reinforcing layer after drying, so that the bonding between the reinforcing layer and the reinforcing layer can be further strengthened. Here, it is sufficient that the anchor body has a shape that does not fall out of the reinforcing layer after drying, and there is no particular restriction on the shape. As the anchor body, for example, a linear body formed in a spiral shape can be used. Specifically, a wire made of an inorganic material such as a metal having a thickness of 0.3 to 6.0 mm or an organic material such as a polymer is pitched at a pitch of 10 mm.
Anchor body having a diameter of about 50 to 50 mm, a diameter of about 10 to 50 mm, and a length of at least three times the pitch can be used as an anchor body. Can be sufficient. Even such a simple structure can sufficiently contribute to strengthening the bond between the reinforcing layer and the reinforcing layer.

Further, in the present invention, it is preferable to apply a release agent to the surface of the mold member facing the existing concrete material before applying the reinforcing material. By so doing, when the mold material is removed, the reinforcing layer easily separates from the mold material, so that the removal of the mold material does not damage the surface of the reinforcing layer. The release agent is not particularly limited, and a silicone-based release agent or an oil-based release agent can be used.

In the present invention, it is preferable to mix a rust preventive into the reinforcing filler. In particular, by using a reinforcing filler containing a vaporizable rust inhibitor, the rust inhibitor can be sent to the existing concrete material through the reinforcing layer, and the corrosion of reinforcing steel in the existing concrete material can be reduced. Will be prevented.

The method for reinforcing the surface of an existing concrete material according to the present invention can be used even when the surface of the existing concrete material is increased in thickness as it is. It can also be used when the surface that appears later is used as a surface to be reinforced, for example, when the thickness is increased by making up for the cut-out portion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for reinforcing the surface of an existing concrete material according to the present invention will be described below with reference to the accompanying drawings.

In order to carry out the method for reinforcing the surface of an existing concrete material according to this embodiment, first, the surface of the existing concrete material 1 whose surface is to be reinforced is scraped with a predetermined thickness, particularly for a portion that has deteriorated over time. The surface of the existing concrete material 1 that has appeared after shaving becomes the reinforcement target surface 2.

Next, a mold member 3 capable of covering the entire surface to be reinforced 2 is prepared. The shape member 3 is divided into a plurality of parts from the viewpoint of easy handling and the like, and is combined so as to cover the entire surface to be reinforced 2.
First, as a preparation for the mold 3, a release agent (not shown) is applied to the inner surface of the mold 3 (the surface facing the reinforcement target surface 2 when the mold 3 is installed). In this embodiment, a silicone-based release agent is used. Next, the reinforcing layer 4 is formed by applying a reinforcing material to the inner surface of the mold material 3 to which the release agent has been applied. The reinforcing material contains glass fiber and an epoxy resin adhesive. Glass fiber has a diameter of 20
A monofilament or a convergent fiber having a length of 1 to 1000 μm is cut into a length of 1 to 100 mm. On the other hand, KW202 manufactured by Kawai Chemical Co., Ltd. is used as the epoxy resin adhesive. Then, before the reinforcing material is dried, the anchor body 5 is pressed against the surface of the reinforcing layer 4 and is dried and hardened to hold the anchor body 5 on the reinforcing layer 4. Here, the anchor body 5 is
A metal wire having a thickness of 1.2 mm is spirally wound with a pitch of about 30 mm, a diameter of about 20 mm, and a length of about 200 mm, and is arranged on the reinforcing layer 4 at intervals of about 20 cm. FIG. 1 shows a state in which the reinforcing layer 4 is provided on the inner side surface of the mold 3.

After the reinforcing layer 4 is provided on the inner surface of the mold 3, the mold 3 is placed facing the surface 2 to be reinforced. The distance between the shape member 3 and the surface 2 to be reinforced is determined as appropriate depending on the finally required strength and the like. In the present embodiment, the distance is about 8 cm. This state is shown in FIG.
In this embodiment, for the sake of simplicity of the operation, the reinforcing layer 4 is formed and the anchor body 5 is attached before the mold member 3 is opposed to the reinforcement target surface. Needless to say, the reinforcement layer 4 and the anchor body 5 can be attached after the installation of the anchor 3 is performed first.

Next, the end portion of the mold 3 is sealed. Specifically, as shown in FIG. 3, the end portion of the mold 3 is sealed with a putty-like adhesive 6. When performing the sealing process, a pipe 7 is inserted so as to penetrate the putty-like adhesive 6. This pipe 7 will later serve as an inlet for the filler for reinforcement, but in order to form a hole for venting air to smoothly inject the filler for reinforcement, another pipe is inserted into another part. You can leave it.

Next, cement mortar as a reinforcing filler is passed through the pipe 7 and the reinforcing layer 4 and the surface 2 to be reinforced.
The reinforcing layer 8 is formed by pouring into the gap between. MCI (trademark: manufactured by Co-Tech Co., Ltd.) as a rust preventive is added to the reinforcing filler. This rust preventive is vaporizable and water-soluble, diffuses from the reinforcing layer 8 into the existing concrete material, and is absorbed on the surface of a reinforcing bar or the like, thereby producing a rust preventive effect. This prevents further corrosion of the internal rebar. The pouring of the reinforcing filler is preferably performed before the reinforcing layer 4 is completely dried and hardened.
When 02 is used as the reinforcing material, the bonding between the reinforcing layer 8 and the reinforcing layer 4 becomes considerably strong even when the reinforcing filler is poured after the reinforcing layer 4 is completely dried and hardened. . In an experiment conducted by the applicant, the bonding strength when the reinforcing filler was poured after the reinforcing layer 4 was completely dried and hardened was 12.5 kg / cm ² . This state is shown in FIG.

Next, after the reinforcing layer 8 has been cured until it is completely cured, the mold 3 is removed and removed. This state is shown in FIG.
(C) of FIG. The removal of the mold 3 can be performed very easily by the effect of the release agent. Finally, there is a portion where the mold members 3 are in contact with each other and there is no jointed reinforcing layer 4, or a reinforcing layer 4 at a position corresponding to the bolt hole used to attach the mold member 3. The same reinforcing material as that described above is applied again to the portions not to be polished, and finished so that the portions where the reinforcing layer 8 is exposed are eliminated, and the surface reinforcing method of the existing concrete material is completed.

Next, different embodiments of the method for reinforcing the surface of an existing concrete material according to the present invention will be described. The method in this embodiment is basically the same as the surface reinforcing method in the above embodiment. However, in the surface reinforcing method in the above-described embodiment, the reinforcing layer 4 is formed by applying a reinforcing material obtained by kneading a chopped glass fiber and an epoxy resin adhesive to the inner surface of the mold 3.
In the present embodiment, a reinforcing material made by impregnating glass fibers woven in a mesh shape into an epoxy resin adhesive is used as a reinforcing material, and the reinforcing layer 4 is formed by attaching the reinforcing material to the inner surface of the mold 3. I have. Thereby, the reinforcing layer 8 covered with the reinforcing layer 4 having high tensile strength can be obtained.

[0023]

As described above, in the method for reinforcing an existing concrete material according to the present application, since a water-impermeable reinforcing layer is formed by applying a reinforcing material, it is necessary to prepare a mold material in advance. Therefore, it is possible to flexibly respond to a change in the shape of the mold material, and it is possible to extremely easily prevent the reinforcing layer from being exposed. Further, according to the present invention, the connection between the reinforcing layer and the reinforcing layer can be strengthened, and particularly when an anchor body is used, the bonding between the two layers is further strengthened.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a reinforcing layer is formed on a shape member and an anchor body is attached by a method for reinforcing an existing concrete agent according to an embodiment of the present invention.

FIG. 2 is a side view for explaining a method of reinforcing an existing concrete agent in one embodiment of the present invention.

FIG. 3 is a side view showing an end processing state of a shape member for pouring a reinforcing filler in the method of reinforcing an existing concrete agent shown in FIG. 2;

[Explanation of symbols]

 1 Existing Concrete Material 2 Reinforcement Surface 3 Mold 4 Reinforcement Layer 5 Anchor Body 6 Putty Adhesive 7 Pipe 8 Reinforcement Layer

Claims (8)

[Claims] 1. A molding material is installed at a predetermined distance from a surface to be reinforced of an existing concrete material, and a hardening reinforcing material is poured into a gap formed between the existing concrete material and the molding material, and the reinforcing material is filled. In a method for reinforcing a surface of an existing concrete material, in which a reinforcing layer is laminated on a surface to be reinforced by removing the mold after curing of the material, the reinforcing material and a resin adhesive are provided on a surface facing the surface to be reinforced of the mold. By forming the reinforcing layer in advance by applying the reinforcing material, and then removing the mold material after pouring the reinforcing filler, the reinforcing layer covered with the reinforcing layer is laminated on the surface to be reinforced. Characteristic method of surface reinforcement of existing concrete materials. 2. A reinforcing layer is formed by applying a reinforcing material obtained by kneading a chopped reinforcing fiber and a resin adhesive to a surface of a mold member facing a surface to be reinforced.
The method for reinforcing a surface of an existing concrete material described in the above. 3. The reinforcing layer is formed by attaching a reinforcing material obtained by impregnating a reinforcing fiber woven into a mesh shape into a resin adhesive to a surface of a mold member facing a surface to be reinforced. The method for reinforcing a surface of an existing concrete material described in the above. 4. The method according to claim 1, wherein before the drying of the reinforcing layer, the anchor is held on the reinforcing layer by disposing an anchor on the surface of the reinforcing layer, and then the reinforcing filler is poured. 4. The method for reinforcing a surface of an existing concrete material according to any one of the above items 3. 5. The method for reinforcing a surface of an existing concrete material according to claim 4, wherein the anchor body is a spirally formed linear body. 6. The method for reinforcing a surface of an existing concrete material according to claim 1, wherein a reinforcing agent is formed after applying a release agent to a surface of the mold material facing the existing concrete material. . 7. The reinforcing filler contains a rust inhibitor.
The method for reinforcing a surface of an existing concrete material according to any one of claims 1 to 6. 8. The existing concrete material according to any one of claims 1 to 7, wherein the surface of the existing concrete material is shaved to a predetermined thickness, and a surface that appears after the shaving is used as a surface to be reinforced. Surface reinforcement method.