JP2001012083A - Crack repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crack repair method, by which an excellent adhesive effect in an extent that a finishing material is not peeled is obtained and workability and profitability are improved. SOLUTION: The crack repair method has a process in which a position in fixed width is scraped off along a crack to be repaired and a surface is smoothed and cleaned, a process in which the surface is coated with a primer 10, a process in which the upper section of the primer 10 is coated with a waterproof adhesive material 12, a process in which reinforcing cloth 14 is stuck onto the waterproof adhesive material 12, a process in which the upper section of reinforcing cloth 14 is coated with the waterproof adhesive material 16 and a process in which the upper section of the waterproof adhesive material 12 is coated with a material, in which water is mixed into a cement waterproof material and kneaded, by using a brush or spraying.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates generally to crack repair methods. More specifically, the present invention relates to a method for repairing a crack which is simple in operation, hardly peels off a cement-based putty material, mortar, or a coating material as a finishing material, and provides a good adhesive effect.

[0002]

A crack may occur in a concrete structure due to various causes. Leaving cracks that have occurred in the concrete structure may have adverse effects on the concrete structure, such as rainwater entering the cracks and rusting the rebar placed inside the concrete structure, causing frost damage, etc. There is a problem of exerting. Conventionally, in order to solve such a problem, a crack repairing method in which a crack is cut into a V shape and a putty material is filled is known. However, this method has a disadvantage that the filled putty material is easily peeled off. In order to solve such inconvenience, the present inventor fills the cracks with the putty material and pastes a reinforcing cloth on the putty material,
Furthermore, a crack repair method for applying a neoprene waterproofing material thereon has been developed (see Japanese Utility Model Application No. 60-125987).

[0003] However, although the above-mentioned crack repairing method has been improved in terms of reinforcing the cracks and improving the waterproof performance, it still has the following problems. First, when a neoprene rubber waterproofing material is applied to the portion after repairing a crack, the adhesive strength of the neoprene rubber waterproofing material is reduced due to a time difference or the passage of days, and a cement-based putty serving as a finishing material is obtained. Timber,
There is an inconvenience that the mortar or the coating material is peeled off from the repaired portion or sagging occurs due to the weight of the finishing material itself. Second, since the color of the concrete skeleton and the color of the repaired part are different, it is necessary to perform color matching work, which complicates the work and lowers the work efficiency. Third, due to the heterogeneous combination of the neoprene waterproofing material and the finishing material, an adhesive effect between them cannot be expected. Fourth, since the neoprene waterproofing material and the finishing material have different expansion coefficients, the finishing material is easily peeled off after repair.

[0004] On the other hand, in order to prevent the finishing material from peeling off, a method of attaching a wire net-like cloth with foot hair to a repaired portion has also been implemented. However, it is very difficult to paste the cloth so that it does not wrinkle, and since it is necessary to wait for the adhesive to dry after applying the cloth and apply the finishing material, the work is time consuming and troublesome. There was a problem that there was.

Accordingly, the present invention provides a method for repairing a crack, which can obtain a good adhesive effect such that the finishing material does not peel off while maintaining the reinforcing and waterproofing properties of the crack, and is excellent in workability and economy. It is intended to be.

[0006]

According to a first aspect of the present invention, there is provided a method for repairing a crack, comprising the steps of: removing a portion of a predetermined width along a crack to be repaired, smoothing the surface, and cleaning the surface; And a step of applying a waterproof adhesive on the primer, a step of applying a reinforcing cloth on the waterproof adhesive, and a step of applying the waterproof adhesive on the reinforcing cloth, A step of applying a mixture obtained by mixing water into a cement-based waterproofing material, using a brush or a brush, or spraying the mixture on the waterproofing adhesive material.

According to a second aspect of the present invention, there is provided the crack repairing method according to the first aspect, wherein the waterproof adhesive comprises:
It is one of a neoprene rubber waterproofing material and an epoxy resin waterproofing material.

[0008]

FIG. 1 is a sectional view showing a repaired portion of a concrete structure repaired by the method of the present invention, and FIG. 2 is a view showing a procedure of the method of the present invention.
As shown in FIG. 2A, repair of a crack extending downward from a corner of a window of a building will be described as an example. First, as shown in FIG. 2B, a portion having a width of 100 to 150 mm along a crack is cut to a depth of 1.5 to 2 mm using a sander or the like, and the cut surface is smoothed and cleaned.

Next, in order to improve the adhesive force, a primer 10 is applied to the above surface, and a waterproof adhesive 1
2 is applied. Examples of the waterproof adhesive 12 include a neoprene rubber waterproof material and an epoxy resin waterproof material. Then
A mesh-like reinforcing cloth 14 is stuck on the waterproof adhesive 12. The reinforcing cloth is preferably formed of nylon, polyester, aramid fiber, or the like. Note that the reinforcing cloth is preferably stuck so that the upper reinforcing cloth is superimposed on the lower reinforcing cloth. Further, the overlap margin of the upper and lower reinforcing cloths is preferably set to 100 mm in accordance with JIS A6021.

Next, a waterproof adhesive 16 is applied on the reinforcing cloth 14. After that, a cement-based waterproofing material (sometimes referred to as a silicate-based coated waterproofing material) mixed with water and kneaded is then removed with a brush, brush, spray, or the like.
It is applied on the waterproof adhesive 16. Then, a finishing material 2 such as a cement-based putty material, mortar, or a coating material is placed thereon.
0 is applied.

The amount of the cement-based waterproofing material 18 mixed with water and kneaded is 0.6 to 0.7 kg per square cm.
The degree is appropriate.

By applying a kneaded mixture of water to a cement-based waterproofing material, the repaired portion becomes substantially the same color as the surrounding concrete body, and a laborious color matching operation becomes unnecessary. In addition, by applying a liquid kneaded by mixing water with a cement-based waterproofing material using a brush or a brush or by spraying, fine irregularities are formed on the surface, and the bonding area increases, and the liquid is applied thereon. The bonding effect of the finished material is improved.

[0013] Since the cement-based waterproofing material is a waterproofing material, even if the cement-based waterproofing material is mixed with water and applied with a kneaded liquid, and then a finishing material such as mortar is applied, the cement-based waterproofing material is not treated as a finishing material. It does not absorb the water necessary for the hydration reaction of the compound, thus preventing the so-called dry-out phenomenon that causes the contact to peel off.

[0014] When a finishing material such as mortar is applied after applying a liquid kneaded by mixing water with the cement type waterproof material, the active ingredient contained in the cement type waterproof material penetrates into the capillary structure of the mortar. Then, it reacts with the calcium hydroxide in the mortar to form crystals to improve durability and adhesion.

[0015] Next, a test was performed to verify the adhesive effect.
The experiment is explained. With foot hair on concrete base material
The wire mesh cloth was glued with epoxy resin waterproof material
The mortar applied on it and the concrete
Water was mixed with cement-based waterproofing material on the base material and kneaded.
Specimen with liquid applied directly and mortar applied on top
Was prepared. JIS A 69 for both specimens
16 (1995) performed an adhesion test.
The adhesion strength after 28 days was 7.
7kgf / cm^TwoWhereas the latter specimen is 1
7.5kgf / cm ^TwoMet. This allows cement
Good adhesion effect of liquid kneaded by mixing water with water-based waterproofing material
Proven.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims. It goes without saying that it is included in.

[0017]

According to the present invention, by applying a kneaded liquid by mixing water into a cement-based waterproofing material, a good adhesive effect to a finishing material can be obtained, and excellent workability and economic efficiency can be obtained. A repair method is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a repaired portion of a concrete structure repaired by a method of the present invention.

FIG. 2 is a diagram showing the procedure of the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Primer 12 Waterproof adhesive 14 Reinforcement cloth 16 Waterproof adhesive 18 Liquid mixed with water in cement-based waterproofing material 20 Finishing material

Claims (2)

[Claims] 1. A method for repairing a crack, comprising the steps of: shaving off a portion of a predetermined width along a crack to be repaired, smoothing and cleaning the surface; applying a primer to the surface; Applying a waterproof adhesive on the waterproof adhesive, applying a reinforcing cloth on the waterproof adhesive, applying the waterproof adhesive on the reinforcing cloth, and then mixing the cement-based waterproofing material with water. Applying a brush or brush on the waterproof adhesive, or by spraying. 2. The method according to claim 1, wherein the waterproof adhesive is one of a neoprene rubber waterproof material and an epoxy resin waterproof material.