JP2003129674A - Sticking material for repairing concrete structure and repair method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient method of repairing a concrete structure using a simple masking method in place of conventional masking methods, eliminating the need for re-sticking after sticking while facilitating subsequent disposal of tape, and a sticking material for use therein. SOLUTION: The sticking material for use in the work of repairing a concrete structure with mortar involves a sheet of base material with an adhesive layer on one side, and a release sheet attached to the adhesive layer surface of the sheet of base material, and has a width of 40 to 70 cm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a concrete structure using mortar and a patch used for the method.

[Prior art]

For repairing damage or cracks in a concrete structure, a construction method by spraying mortar is usually adopted because the construction is easy and reliable and the economy is excellent. However, this method has a drawback that the portion adjacent to the repaired portion is easily contaminated by the mortar because the blasting is performed by blasting the mortar in a granular form with compressed air. Therefore, measures for avoiding this contamination are essential when the structure is restored by spraying mortar.

Countermeasures against the above-mentioned contamination in the repair work have conventionally been carried out by so-called masking in which only a commercially available adhesive tape or a polyethylene sheet or a vinyl sheet is attached to the periphery of the repair portion with an adhesive tape.

[0004] In this method, in order to prevent the chipping work of deteriorated concrete in the repair work from becoming a feather edge (a state where the boundary part looks like a bird's wing), a cut is made at the chipping end with a concrete cutter. Since it is often performed later (FIG. 1), it can be said that it is rational that the outer shape of the portion around the portion to be repaired is surrounded by straight lines that are orthogonal or parallel to each other.

However, this method has the following problems. First, when the adhesive tape alone is used, a sufficient curing width cannot be obtained for the mortar to be sprayed, and therefore tapes need to be laminated, which takes time and effort. Further, the adhesive tape attaching operation itself is not easy to handle, and thus it is difficult for one worker to perform the operation independently. In particular, it becomes more difficult in the case of a large attachment site, or in a high place or a narrow place.

In addition, when a sheet is used, in addition to the problem of the complexity of the sticking work, the entire surface of the sheet is not stuck, and only the ends of the sheet are stuck and fixed with a narrow tape. Therefore, the sheet is loosened by being blown by the wind after being attached, and the sheet is easily peeled off when air enters from the loosened portion. Due to this loosening, the sprayed mortar penetrates into the parts other than the repaired part, and the appearance of the finished product is impaired. In addition, since loosening and peeling easily occur during the repair work, the sticking work is forced to be performed again, which causes the efficiency of the repair work itself to be reduced.

Further, even after the spraying work, peeling of the sheet is likely to occur due to the weight of the scattered mortar attached. In particular, the finishing step by drying after spraying requires standing for a certain period of time, which increases the risk of the above problems occurring.

Further, the peeled sheet not only compels re-sticking, but also causes a sudden stop of the vehicle during work on a road bridge or a railway bridge, which may cause an accident.

In addition to the above, after the repair work is completed, it is necessary to remove the member used for masking and dispose of the tape. However, many tapes generate toxic gas when they are burned, so burning treatment on site is not possible. It is possible, and it is also a problem that they are forced to take it back and dispose of it.

Since the conventional masking methods have the above problems, there is a great demand for a masking method which does not have these problems.

[0011]

Therefore, an object of the present invention is to use a masking method which is an alternative to the conventional masking method and which is simple and does not require re-sticking after sticking and is easy to dispose of the tape after the sticking. To provide an efficient method for repairing a concrete structure and an adhesive material used therefor.

[0012]

Means for Solving the Problems The inventors of the present invention, as a result of repeated studies in view of the above problems, have surprisingly found that a base material having a pressure-sensitive adhesive layer on one surface instead of a vinyl tape or the like which has been conventionally used. By using the adhesive sheet having a material sheet and a release sheet attached to the pressure-sensitive adhesive layer surface of the base sheet and having a width of 40 to 70 cm, the convenience of masking work is remarkably improved, and the above-mentioned problems are solved. The inventors have found that they can be solved all at once, and completed the present invention.

That is, the present invention is a patch for use in a mortar restoration work of a concrete structure, which comprises a base sheet having a pressure-sensitive adhesive layer on one side, and a peeling adhered to the pressure-sensitive adhesive layer side of the base sheet. 40 to 7 including sheets
It relates to the above patch having a width of 0 cm.

The present invention also relates to the above-mentioned patch, wherein the material of the base sheet is paper. further,
The present invention relates to the adhesive material, wherein the release sheet has a length of 30 to 60 cm. Furthermore,
The present invention relates to the above-mentioned patch, which has a rectangular outer shape.

Then, the present invention is a method for repairing a concrete structure using mortar, wherein a base sheet having a pressure-sensitive adhesive layer on one side and a pressure-sensitive adhesive layer surface of the base sheet are attached before mortar construction. Including a release sheet,
Peeling off the release sheet of the patch having a width of 70 cm,
The present invention relates to the above-mentioned method, which comprises a step of sticking and fixing the patch so that only the repaired part is exposed around the repaired part.

The mortar used as a repair material in the method of the present invention contains only water as its liquid component. Therefore, after the restoration work, the liquid component of the mortar,
That is, even if moisture permeates the patch and reaches a site other than the repair site, the water is easily dried, so that the aesthetic appearance of the repair site is not impaired. Therefore, the patch of the present invention is preferably used when using a repair material containing a liquid component such as water that is colorless and easily dried, such as mortar.

Since the patch of the present invention has a wider width than the conventional tape and moreover the entire surface is adhered, masking can be performed only with the patch. Therefore, in order to make the pasting work much easier than before,
Allows one worker to do it alone. The patch can also be used for fixing a water resistant sheet.

Since the entire surface of the patch of the present invention is bonded as described above, a gap is unlikely to form between the patch and the object to be adhered. In addition, even if a gap should occur, the adhesive material has a wide width, and therefore the effect of reducing the adhesive force is extremely small as compared with the conventional method. Therefore, the effect of wind or the like is much smaller than that of the conventional one, and masking that is extremely hard to peel off can be performed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, but for the purpose of explaining the present invention more clearly and limiting the scope of the present invention. is not.

The method for repairing a concrete structure according to the present invention includes a) a step of peeling a release sheet from a patch, b) a masking step around the repaired portion, c) a repairing step, and d) a masking member peeling step. . These will be described in detail below.

The patch of the present invention comprises a base material sheet coated with an adhesive layer and a release sheet. Therefore, before the repair work, it is necessary to first peel off the release sheet from the base material sheet, but the peeling can be performed very easily.

The width of the patch can be appropriately selected, but if it is less than 40 cm, the adhesiveness may be insufficient, and if it exceeds 70 cm, it becomes difficult to handle. Therefore, the width may be 40 to 70 cm, preferably 50 to 60 cm.

The material of the base sheet of the patch is not particularly limited as long as it can be stuck to the concrete by the adhesive layer, but considering the ease of disposal after the work, it is toxic at the time of burning. Those that do not generate substances are preferable, and those made of paper are particularly preferable. Also, in order to prevent it from being damaged by moisture when spraying mortar,
Those having water resistance are preferable.

Examples of the base sheet made of such a material include cellulose, calcium carbonate, and / or P.
Examples include ET (polyethylene terephthalene). As such an example, those made of NEW Special Rable 65 (trade name: manufactured by Special Paper Manufacturing Co., Ltd.) and Crisper (trade name: manufactured by Toyobo Co., Ltd.) can be mentioned.

Among these, the NEW special rave 65 is a component which is made of cellulose, calcium carbonate, kaolin, titanium oxide, and SBR resin and which imparts water resistance to the patch. Crisper is a synthetic paper using PET and is suitable from the viewpoint of resource recycling.

The pressure-sensitive adhesive is also preferably one which does not generate a toxic substance upon combustion, and examples thereof include those containing an acrylic copolymer-based pressure-sensitive adhesive. An example of this is Cybinol AT-D ₃₇ L (trade name: manufactured by Saiden Chemical Co., Ltd.).

In the case of railway-related structures and the like (for example, viaducts), the surface of the structure may be coated, but this does not hinder the adhesion of the patch. However, when it is wet due to rain or the like, it is necessary to perform work after drying or to select and use a patch having both adhesiveness and wet resistance.

[0028] The protective sheet has 1
It may be covered with a single sheet, but if it is protected by two or more protective sheets, it is possible to prevent the entanglement of the patch itself and to perform the sticking work efficiently by peeling them off one by one. It is preferable because it is possible. In the patch according to the present invention, since the protective sheet also does not generate a harmful substance when burning, it is suitable from the viewpoint of environmental protection.

As for the external shape of the patch, if the peripheral edge is a straight one, for example, a rectangular one, the work to be performed after cutting the chisel edge with a concrete cutter and shaping the outer circumference into a straight line It is suitable because it is easy to deal with.

Next, an adhesive material is attached and fixed around the repaired portion to perform masking. The masking may be performed in parallel while peeling the release sheet. By the masking, it is possible to prevent the peripheral portion from being contaminated in the subsequent coating operation with mortar spraying or trowel.

Masking is performed using only the patch or a sheet fixed by the patch so that only the repaired portion is exposed. In order to more firmly fix the application site, the application of the application material needs to be performed so that air does not enter between the application material and the adherend as much as possible.

After masking, repair with repair material is performed. The repair work is mainly by spraying mortar, but coating with a trowel can also be suitably performed.

After the repair work, confirm that the mortar is dry,
When the patch is used, the sheet is peeled off to complete the repair work. As described above, if the patch is made of paper, it is suitable because it can be incinerated at the site of the patch.

[0034]

According to the present invention, the repair of a concrete structure can be performed more efficiently and easily than ever before.

[Brief description of drawings]

FIG. 1 is a diagram showing a shaping process of a repaired portion by chipping work.

[Explanation of symbols]

1 rebar 2 restoration department 3 feather edges 4 Cutting with a cutter

Claims (5)

[Claims] 1. A patch for use in mortar restoration work of a concrete structure, comprising a base sheet having a pressure-sensitive adhesive layer on one side, and a release sheet attached to the pressure-sensitive adhesive layer side of the base sheet. The adhesive material having a width of 40 to 70 cm. 2. The patch according to claim 1, wherein the material of the base sheet is paper. 3. The patch according to claim 1, wherein the release sheet has a length of 30 to 60 cm. 4. The patch according to any one of claims 1 to 3, which has a rectangular outer shape. 5. A method for repairing a concrete structure using mortar, comprising a base sheet having a pressure-sensitive adhesive layer on one side and a release sheet attached to the pressure-sensitive adhesive layer side of the base sheet before mortar construction. And a step of peeling off the release sheet of the patch having a width of 40 to 70 cm, and fixing and fixing the patch so that only the repaired part is exposed around the repaired part. .