JP6157303B2 - Building surface repair structure and repair method - Google Patents

Description

  The present invention relates to a repair structure and a repair method for repairing a crack generated on a building surface, for example, a wall surface or a roof surface. More specifically, the present invention relates to a repair structure and a repair method for repairing a crack of a deterioration phenomenon in a paint finish of a wall surface by a concrete / mortar / board structure or the like.

  Cracking (also referred to as a crack or a crack) is one of the deterioration phenomena in the paint finishing of a wall surface of a concrete mortar board structure (hereinafter also referred to simply as a wall surface or a building surface). The cause of the occurrence of cracks includes repeated thermal expansion and contraction due to the movement of the substrate itself and the cycle of heating / cooling / drying. If moisture enters (penetrates) from the cracked part of the wall, it will lead to deterioration of concrete, mortar and board as a wall material and precipitation of efflorescence. It is important from the point of view.

  Conventionally, in order to repair a crack generated on a wall surface, when the crack width is 0.3 mm or less, a construction method (called an imprinting construction method) of painting with a base material conditioner for paint (resin mortar, etc.) has been performed. If the crack width is greater than 0.3 mm, the wall surface is cut into a U shape along the crack, and after applying a primer, a sealing material and a resin mortar are filled in the groove cut into the U shape (U or (Referred to as a V-cut seal method).

  However, these conventional methods have the following problems to be improved. For example, in the imprinting method, since the followability of the resin mortar itself used to the movement of the ground is low, there is a problem that the possibility of re-cracking due to thermal expansion or contraction of the wall surface due to solar heat or the like is high. In addition, in the case of the U or V cut seal method, there is a problem that the working environment and the living environment are deteriorated because dust and noise are generated when cutting into a U or V shape along the crack. In addition, there is a problem in terms of cost including labor costs, such as a large number of processes and a prolonged construction period due to securing curing time. Furthermore, since the sealing material in the U or V cut groove is thinned and dents are generated, it is difficult to maintain the aesthetics over time.

  Patent Document 1 discloses a method for repairing hair cracks, in which at least two wires having a thickness that can be disposed inside the hair cracks are composed of an adhesive main agent and a hardening agent composed of a main agent and a hardening agent. Either one or the other is attached to each other, and the wire material to which the main agent is attached and the wire material to which the hardener is attached are inserted and arranged along the hair crack, and the adhesive is cured by reacting the main agent and the hardener. And the crack repairing method which obstruct | occludes the opening side part of a hair crack is disclosed. In order to close the opening side portion of the crack, a step of inserting a wire along the crack is required.

JP 2011-58291 A

  There is a demand for a structure for repairing a building surface that prevents the occurrence of cracks in the paint layer again, does not generate dust or noise during repair work, and has a reduced number of processes in order to shorten the construction period.

  The present invention is a building surface repair structure for repairing cracks on the building surface (wall surface or roof surface), and has a back surface having adhesiveness to the building surface and has a stretchable tape, A tape that is attached to the building surface along the crack so as to cover the crack with a back surface facing the building surface, and the building surface so as to cover the tape attached to the building surface An elastic layer formed by applying an elastic material to a building surface repair structure is provided.

  Moreover, this invention provides the repair structure of the building surface with which the said tape is provided with the surface which has the adhesiveness with respect to the said elastic layer on the other side of the said back surface.

  Moreover, this invention provides the repair structure of the building surface whose breaking elongation of the said tape is 50% or more.

  Moreover, this invention provides the repair structure of the building surface whose thickness of the said tape is 0.05 mm or more and 0.25 mm or less.

  Moreover, this invention provides the repair structure of the building surface where the said tape uses a film as a base material and has an acrylic adhesive material in the back surface of the said tape.

  The building surface is a wall surface, the elastic material is an elastic paint or a fine elastic paint, and the elastic layer is a paint layer formed by applying the elastic paint or the fine elastic paint. Provide repair structure.

  The elastic paint or the microelastic paint is an acrylic paint and provides a repair structure for a building surface.

  In the present invention, the elastic layer may be applied to a region of the building surface covering the first elastic layer and the first elastic layer applied with a predetermined width along the tape so as to cover the tape. Provided is a building surface repair structure comprising a second elastic layer to be applied.

  The present invention also provides a building surface repair structure in which the tape is transparent or translucent, and both side portions of the tape are color-coded with a predetermined width from the central portion of the tape.

  The present invention is also a building surface repair method for repairing cracks on the building surface, comprising a back surface having adhesiveness to the building surface, and having a stretchable tape with the back surface facing the building surface. Affixing to the building surface along the crack so as to cover the crack, and forming an elastic layer by applying an elastic material to the building surface so as to cover the affixed tape Provide repair methods for building surfaces.

  According to the present invention, the building surface is a wall surface, the elastic material is an elastic paint or a slightly elastic paint, and the elastic layer is a paint layer formed by applying the elastic paint or the slightly elastic paint. Provide repair methods for building surfaces.

  According to the repair structure of the building surface of the present invention, the tape has a back surface having adhesiveness with respect to the building surface and stretchability, so that minute peeling from the cracked portion occurs according to the change in crack width, and the zero span tension phenomenon (After the waterproof layer or paint layer is applied to the base, the base layer is cracked and the waterproof layer or paint layer is pulled from a zero gap state) can be alleviated. At the same time, the elastic layer formed to cover the tape follows the stretched tape, so that the force acting on the elastic layer is relieved. By such an action, it is possible to prevent the occurrence of cracks in the elastic layer again, and thus, it is possible to prevent rainwater from entering the building surface. Further, it is not necessary to cut the building surface into a U shape along the crack as in the prior art, and after applying the tape, an elastic material such as an elastic paint or a microelastic paint can be applied immediately. Therefore, the construction period can be shortened.

It is a top view which shows the repair structure by embodiment of this invention, and a part of paint layers etc. are abbreviate | omitted and shown so that a structure can be understood. It is sectional drawing along the II-II line of FIG. It is a figure which shows the state which affixed the tape along the crack.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following embodiments, the same or similar components are denoted by common reference numerals, and the scale of these drawings is appropriately changed for easy understanding. In addition, it should be noted that the technical scope of the present invention is not limited to these embodiments, but extends to the invention described in the claims and equivalents thereof.

  The building surface repair structure according to this embodiment will be described. The repair structure 20 is a repair structure that repairs a crack 12 (sometimes referred to as a crack) generated on the wall surface 10 (an example of a building surface) with a composite layer of paint or the like. As shown in FIG. 1 and FIG. 2, the repair structure 20 is affixed with a primer 29 applied to the surface of the wall surface 10, a tape 22 attached to the wall surface 10 so as to cover the crack along the crack 12, and the tape 22. After that, a paint layer 24 (an example of an elastic layer) formed by applying an elastic paint or a fine elastic paint (an example of an elastic material) on the tape 22 and the wall surface 10 so as to cover the tape 22 affixed to the wall surface 10. ). The repair structure 20 may further include a finishing layer 28 comprising a top coat applied over the paint layer 24.

  In this embodiment, the tape 22 attached so as to cover the crack 12 along the crack 12 has stretchability, and the breaking elongation thereof is, for example, 50% or more and 20 degrees when the temperature is 5 degrees. 50% or more in the case, and 50% or more in the case of 60 degrees. The tape 22 includes a back surface 22a and a surface 22b on the opposite side. The back surface 22a (see FIG. 2) of the tape 22 is adhesive to the wall surface 10. The tape 22 can be attached to the wall surface 10 by pressing the back surface 22 a of the tape 22 toward the wall surface 10. Further, the surface 22b of the tape 22 has adhesiveness to a paint layer 24 formed by applying an elastic paint or a slightly elastic paint on the tape 22, and the paint applied to the surface 22b of the tape 22 is It is difficult to peel off.

  The base material of the tape 22 of this embodiment is formed of a film, and has an acrylic adhesive material on the back surface 22a. If an acrylic paint is used for the elastic paint or the fine elastic paint, the film 22 is used to increase the adhesion to the elastic paint or the fine elastic paint applied thereon, and the paint layer 24 remains after repair. It becomes difficult to peel off.

  The elastic paint or the microelastic paint forming the paint layer 24 of the present embodiment is a paint having a synthetic resin emulsion type elasticity or microelasticity. Synthetic resin emulsions include vinyl acetate resin, acrylic resin, silicone resin, acrylic silicone resin, fluororesin, urethane resin, styrene resin, cross-linking resin, and those containing multiple resins, which are waterproof. What has is preferable. In this embodiment, the film which is the base material of the tape 22 and an acrylic resin-based microelastic paint having high adhesion and adhesion are used. However, this is an example, and adhesion and adhesion to the tape 22 are used. As long as it is high, other elastic paints and slightly elastic paints may be used. An acrylic film may be adopted as the base material of the tape 22. The elastic paint is, for example, a paint having an elongation of 120% or more at 20 degrees in the test item of JIS A 6909, and the slightly elastic paint is, for example, a paint having an elongation of about 50 to 100%.

  The tape 22 is formed of a transparent or translucent substrate, and the operator pastes the tape 22 along the crack 12 so as to cover the crack 12 through the tape 22 while checking the position of the crack 12. be able to.

  As shown in FIG. 3, the tape 22 of the present embodiment may have guides 23a on both sides thereof. The guide 23a is formed by color-coding the central portion 23b with a predetermined width W3. By adhering the tape 22 to the wall surface 10, even if the width of the crack 12 changes, the tape 22 expands and contracts following the change and prevents the paint layer 24 from cracking again. Therefore, a predetermined distance is secured from the crack 12 to the side of the tape 22 in the width direction of the crack (direction A or B in FIG. 3) so that the tape 22 can follow the change of the crack, It is necessary to affix the tape 22 so as to adhere to the wall surface 10. The tape 22 forms a guide 23a with a width of a distance W3 from both sides of the tape 22 so that the adhesive force of the tape 22 can be secured in the width direction of the crack from the crack 12. The operator can stick the tape 22 to the wall surface 10 along the crack 12 while confirming that the transparent or semi-transparent central portion 23b sandwiched between the guides 23a on both sides includes a crack. If the crack 12 protrudes from the central portion 23b of the tape 22, that is, if the crack 12 is included in the guide 23a, the tape 22 is cut, and the affixing direction of the tape 22 is changed as shown in FIG. When the direction in which the crack 12 extends gradually changes, the tape 22 may be bent and pasted in accordance with the direction in which the crack 12 extends. If the tape 22 is applied so that the crack 12 is included in the central portion 23b sandwiched between the guides 23a of the tape 22, the tape 22 can expand and contract following the change in the crack width.

  The width W1 of the tape 22 is about 5 cm to 10 cm according to the crack width and the size of the crack itself. The width W3 of the guide 23a is suitably about 0.5 cm to 2.0 cm, and preferably about 1 cm.

  The tape 22 is formed from a thin film of 0.05 mm or more and 0.25 mm or less. By repairing the tape 22 made of such a thin film, after applying an elastic paint or a slightly elastic paint on the tape 22, the step between the tape 22 and the surrounding area becomes small, and the position of the tape 22 Will not stand out, and the aesthetics immediately after repair will not deteriorate. The thickness of the tape 22 is merely an example, and when the paint is applied thicker, the tape 22 made of a film thicker than 0.25 mm may be used.

  When the tape 22 is formed with such a width and thickness, the tape 22 can be affixed to the wall surface 10 and, at the same time, the tape 22 appropriately follows the change in the crack width, and the paint layer 24 is cracked again. This can be prevented.

  After pasting the tape 22 along the crack 12, an elastic paint or a slightly elastic paint is applied on the tape 22 and the wall surface 10, that is, on the wall surface 10 so as to cover the pasted tape 22, thereby forming the paint layer 24.

  As shown in FIGS. 1 and 2, the paint layer 24 includes a first paint layer 25 applied at a predetermined width W2 along the tape 22 so as to cover the tape 22, and at least the first paint layer 25. It is comprised from the area | region of the wall surface 10 to cover, or the 2nd coating material layer 26 apply | coated to the whole wall surface 10. FIG. The first paint layer 25 is formed by thickly applying an elastic paint or a slightly elastic paint with a predetermined width W2 wider than the width W1 of the tape 22 by using a wool roller, for example. The predetermined width W2 is, for example, about 1 cm wider than the width W1 of the tape 22. The second paint layer 26 is formed by thinly applying an elastic paint or a fine elastic paint to the wall surface by using, for example, a mastic roller or a sand aggregate roller. By forming the coating layer 24 by applying the elastic coating or the microelastic coating in this way, the elastic coating or the microelastic coating can be applied thickly around the tape 22. The coating layer 24 cooperates with the tape 22 and can follow the change in the crack width to prevent the cracks from recurring. In the figure, the paint layer 24 composed of two paint layers composed of the first paint layer 25 and the second paint layer 26 is shown, but the paint layer 24 is not limited to this, and the paint layer is not limited thereto. 24 may be composed of one paint layer. Further, it may be composed of three or more paint layers having different coating widths.

  A finish layer 28 may be formed on the paint layer 24 by further applying a top coat (top coat material). The paint layer 24 is protected and colored by the finishing layer 28. When an acrylic elastic paint or a slightly elastic paint is applied as the paint layer 24, an acrylic silicon resin paint may be used as the top coat.

  The repair method for realizing the repair structure of the building surface according to this embodiment will be described below.

  The primer 29 is applied by removing dust on the wall surface 10 where the crack 12 to be repaired has occurred. When the crack width of the crack 12 is a predetermined value, for example, 0.3 mm or more, a sealing material may be injected into the crack 12.

  Next, the tape 22 is attached to the wall surface 10 so as to cover the crack 12 along the crack 12 while confirming the position of the crack 12 with the back surface 22 a of the tape 22 facing the wall surface 10.

  Next, an elastic paint or a slightly elastic paint is applied along the tape 22 so as to cover the tape 22 by using a wool roller to form the first paint layer 25. Then, an elastic paint or a slightly elastic paint is applied to the wall surface 10 so as to cover the first paint layer 25 using a mastic roller to form a second paint layer 26. By forming the second paint layer 26 further on the first paint layer 25, the paint layer around the crack is formed thicker than the portion where only the second paint layer 26 is formed. .

  Then, if necessary, a top coat is applied on the second paint layer 26 to form a finish layer 28, and the repair of the wall surface is completed.

  In other words, the building surface repair method according to the present embodiment includes a step of applying the primer 29 to the peripheral portion of the crack 12 wider than the width of the tape 22, and a stretchable and thermoplastic material having adhesive on one side along the crack. A step of covering the cracks by applying the tape 22 and a step of painting and repairing the wall surface including the crack reinforcing portions (22, 29) formed by the step of applying the primer and the step of covering the cracks with the tape. Is the method.

  About the part repaired with the repair method of this embodiment, the foundation crack follow-up test was done on the conditions shown in Table 1. For comparison, the same base crack follow-up test is also performed on the parts repaired by the conventional imprinting method and the U-cut method. Table 1 also shows the specifications of the test specimens for each method and the test results for each specimen. As a test body of each construction method, a specimen having a length of 150 mm and a width of 200 mm and having a crack or a U-cut formed along the length direction in the center of the test body was prepared. And the tape whose width W1 is 50 mm is affixed on the test body repaired with the repair method of this embodiment along the crack.

  The test conditions for the ground crack follow-up test were as follows: Universal testing machine (AG2000-IS) manufactured by Shimadzu Corporation was used as the test equipment, the tensile speed was 1 mm / min, and the test temperature was 5 degrees. In addition, as a test method, the initial state of the crack width was set to 0.0 mm, and then the state in which the crack width was 0.3 mm and 2.0 mm was repeatedly performed, and the state of each test specimen after 100 cycles was observed. .

  As shown in Table 1, it was confirmed that cracks occurred again in the paint layer in the test body repaired by the conventional imprinting method. In addition, cracks occurred in the paint layer in the test specimen repaired by the U-cut method. On the other hand, it was confirmed that the test body repaired by the repair method of this embodiment had no cracks in the tape and the paint layer.

The adhesion test of the repaired part by the repairing method according to the present embodiment was performed. As the structure of the test body, a primer was applied to the wall surface of the test body, a tape was applied, a fine elastic paint (0.8 kg / m ² ) was applied thereon, and an acrylic silicon resin paint (0. 3 kg / m ² ) was applied.

  The adhesion test was performed by a cross-cut method. In the cross-cut method, the coating film applied on the substrate is made into a grid by cutting vertically and horizontally (interval = 2 mm) perpendicular to each other, the adhesive tape is attached to the grid of the coating film, and the number of paints peeled off when pulled apart This is a method for evaluating adhesiveness by counting.

  At the same time, in order to confirm water resistance, the above-mentioned test specimen was immersed in water, and the number of peeled paints in the initial state, one week later, two weeks later, and eight weeks later was counted. In order to check the heat resistance, the specimen is left in a place maintained at a temperature of 80 ° C., and the number of paints peeled off in the initial state, 1 week, 2 weeks, and 8 weeks is counted. did. The test results are shown in Table 2.

  In any case, the peeling of the paint is not confirmed, and it can be seen that the adhesive force between the slightly elastic paint at the repaired portion and the tape is high.

  That is, the portion repaired by the repair method according to the present embodiment is less likely to crack compared to the conventional method, and the paint does not peel off over time.

  The repair structure and repair method according to this embodiment have been described above with reference to the drawings. According to the repair structure according to the present embodiment, it is possible to prevent a crack from occurring again in the paint layer even after the repair. Further, since the wall surface is not cut into a U-shape unlike the conventional method, dust and noise are not generated during the repair work. In addition, since the paint can be applied immediately after the tape is applied, the construction period can be shortened. Moreover, since a thin tape is affixed, a repair part does not stand out and the aesthetics of a wall surface do not fall immediately after construction.

  In the present embodiment, the case where the building surface is a wall surface and the elastic layer is made of an elastic paint or a slightly elastic paint that is an elastic material has been described. The elastic layer may be formed by applying a waterproof material.

10 Wall surface (building surface)
12 Crack 20 Repair structure 22 Tape 23a Guide 23b Central portion 24 Paint layer (elastic layer)
25 First paint layer (first elastic layer)
26 Second paint layer (second elastic layer)
28 Finishing layer 29 Primer

Claims (11)

A building surface repair structure for repairing cracks on the building surface,
A tape having a back surface having adhesiveness to the building surface and having elasticity, so that the back surface faces the building surface and is attached to the building surface along the crack so as to cover the crack. And tape
A building surface repair structure comprising: an elastic layer formed by applying an elastic material to the building surface so as to cover the tape affixed to the building surface.   The building surface repair structure according to claim 1, wherein the tape has a surface having adhesion to the elastic layer on a side opposite to the back surface.   The repair structure for a building surface according to claim 1 or 2, wherein the tape has a breaking elongation of 50% or more.   The building surface repair structure according to any one of claims 1 to 3, wherein the tape has a thickness of 0.05 mm or more and 0.25 mm or less.   The building surface repair structure according to any one of claims 1 to 4, wherein the tape has a film as a base material and has an acrylic adhesive on the back surface of the tape.   The building surface is a wall surface, the elastic material is an elastic paint or a slightly elastic paint, and the elastic layer is a paint layer formed by applying the elastic paint or the slightly elastic paint. The repair structure of the building surface as described in any one of these.   The building surface repair structure according to claim 6, wherein the elastic paint or the slightly elastic paint is an acrylic paint.   The elastic layer is applied to a region of the building surface covering the first elastic layer and a first elastic layer applied to the tape with a predetermined width so as to cover the tape. The building surface repair structure according to any one of claims 1 to 7, comprising an elastic layer.   The building surface repair structure according to any one of claims 1 to 8, wherein the tape is transparent or translucent, and both side portions of the tape are color-coded with a central portion of the tape with a predetermined width. . A repair method for building surfaces that repairs cracks on the building surface,
A tape having a back surface having adhesiveness to the building surface and having a stretch property is applied to the building surface along the crack so as to cover the crack, with the back surface facing the building surface;
Applying an elastic material to the building surface to form an elastic layer so as to cover the affixed tape, and repairing the building surface.   The building surface is a wall surface, the elastic material is an elastic paint or a fine elastic paint, and the elastic layer is a paint layer formed by applying the elastic paint or the fine elastic paint. The building surface repair method.

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