JP5485502B2 - Wall repair structure - Google Patents

Description

  The present invention relates to a wall surface repair structure that prevents moisture from entering from a crack portion generated in a wall surface and prevents the wall surface from peeling (floating) and falling off due to the intrusion of moisture.

Cracks occur in concrete walls, mortar walls, or wall surfaces such as tiles and bricks (hereinafter collectively referred to simply as wall surfaces). One of the causes of this crack generation is an internal stress generated inside the wall surface.
The cause of this internal stress is that the wall surface has a temperature difference between the part exposed to solar heat and the shaded part or the shaded part of the tree. Arise.
Other factors include drying shrinkage and earthquakes during wall enforcement.

For example, when rainwater permeates from the cracked portion, the wall material is deteriorated, and in the case of reinforced concrete, the reinforcing bar is corroded.
Further, when the penetrated moisture is thermally expanded by solar heat or the like, the wall surface is lifted, and the so-called wall surface is peeled off and dropped off.
Thus, there is a close relationship between the cracks on the wall surface and the float on the wall surface. Moreover, the normal wall surface has applied the finishing layer on the base layer for maintaining the beauty of the wall surface.

  Therefore, the finish layer peels off due to the organic relationship between the difference in temperature (difference in thermal expansion) between the finish layer and the undercoat layer and the difference in thermal expansion between the shaded portion and the sunlit portion of the finish layer. In other words, even if the cracks in the finished layer are not visible, the finished layer may float.

As a technical term, peeling (floating) means peeling off (lifting), but in this technology, peeling (floating) means a state where the two are not integrated, and adhesion means peeling (floating) occurs. That is.
Therefore, even when the mirror surface and the mirror surface cannot be confirmed by visual observation, they are not integrated with each other, so that peeling (floating) occurs.

Conventionally, wall surface cracking and wall surface lifting are considered to be different technical causes, and the wall surface is repaired.
That is, for the floating of the wall surface, as shown in FIG. 7, the base material 4 for applying the filler 2 to the wall surface 1 to fix the tile 3 and sticking the net 5 to the surface of the tile 3. The net 5 was pressed by the pins 7.
And the finishing layer 6 was apply | coated in order to make the head of the pin 7 invisible (refer patent document 1).
Japanese Patent No. 2796696

In addition, as a method for preventing moisture from entering from the crack, as shown in FIG. 8, a sealing material 9 is applied to the cracked portion 8, and the net 5 is stuck on the sealing material 9. There is one in which a repair composite layer in which a net 10 is embedded by applying a filler 10 is formed.
The purpose of this sealing method is as follows.
That is, the wall surface is thermally expanded and contracted by solar heat. Or it shrinks due to drying shrinkage or earthquake. As a result, the crack width of the crack portion 8 changes. Due to this change in crack width, repeated stresses of tension and compression are generated in the sealing material 9 and the repair composite layer, and cracks are also generated in the sealing material 9 and the repair composite layer itself.
Therefore, in this repair method, the occurrence of cracks in the sealing material 9 and the repair composite layer is forcibly prevented by the strength of the repair composite layer in which the net 5 is embedded.

However, this conventional repair method has the following problems to be improved.
That is, the tensile and compressive force that generates a crack by thermal expansion or contraction is larger than the tensile and compressive strength of the repair composite layer, and thus there is a problem that the crack propagates to the repair composite layer itself.
Further, in order to sufficiently increase the strength of the repair composite layer, the thickness of the repair composite layer must be increased. However, when the thickness of the repair composite layer is increased, there is a problem that the repair composite layer partially rises and the appearance of the finished surface is impaired.

As another conventional example, in FIG. 8, the cracked wall surface is U-cut or V-cut 11 along the cracked portion 8, and the sealing material 9 is filled in the cut portion. A polyester non-woven fabric (corresponding to the net 5) is stuck on this with a polymer cement mortar (corresponding to the filler 10), and a glass fiber net having a high tensile strength is stretched thereon to apply a polymer cement 10 '. Have been disclosed (Patent Document 2).
JP-A-8-28063

Similarly to the conventional example, the latter conventional example uses a repair composite layer in which a net is embedded to forcibly suppress cracks, and thus has the same problem to be improved.
Further, in the latter conventional example, the cracked wall surface is U-cut or V-cut along the crack, and thus has the following problems.
That is, when a cracked wall surface is U or V cut along the crack, there is a problem that a lot of dust is generated, noise is generated, and the working environment is bad. In many cases, the building for repairing the wall surface is in the living environment. Therefore, the generation of dust and noise has a problem of adversely affecting the living environment.
Moreover, since the process which cuts the cracked wall surface U or V along a crack is required, there exists a problem that the construction period to repair becomes long.

Thus, in the past, since the repair of the crack and the float was performed separately, there are the following problems to be improved.
First, as the first problem with repairing cracks, the occurrence of cracks occurs naturally, so it can be confirmed at the present stage where the cracks can be visually confirmed, but there is a possibility that it will occur in the future. Repairs must be made, and there is a problem in terms of durability as a whole wall surface.
As a second problem, the repair of the crack shown in FIG. 8 has a problem that the repaired layer partially rises and the appearance of the finished surface is impaired.
As a third problem, there is a problem that a step of brushing is required to reduce this partial excitement as much as possible, and it takes time for repair.
As a fourth problem, the tensile and compressive forces that generate cracks due to thermal expansion or contraction are larger than the tensile and compressive strength of the repair composite layer, so that the crack propagates to the repair composite layer itself, and the repair composite layer itself cracks. Occurs, and there is a problem in terms of durability as the entire wall surface.

Next, as the first problem related to floating, the floating of the wall surface also occurs naturally, so for example, if the floating occurs including the repaired part of the crack, the repair of the cracked part may be impaired. Yes, it is necessary to repair the cracked portion again to repair the floating shown in FIG.
This re-repair of the crack portion has a problem that an extra step is required because the repair portion shown in FIG. 8 must first be removed (hanging step) and then repaired. The second problem is that since the wall surface is floating in the above-described suspension process, the floating wall surface may drop due to an impact in the suspension process. If the wall falls off, there is a problem that the repair work becomes large, the construction period becomes longer, and the economic loss increases.

It is an object of the present invention to provide a wall surface repair structure that improves the durability of the entire wall surface and the appearance of the finished surface, increases the number of steps, and shortens the work period.
Another object of the present invention is to eliminate U or V cut in repairing cracked parts and to eliminate the influence on the living environment.

In order to solve the above-mentioned problem, the invention according to claim 1 is the repair structure of the wall surface, in the crack portion of the wall surface, in the first net having the specific width W1, the tape having the specific width W2 that is narrower than the width W1 or A sealing material or filler formed on the cracked portion side of the adhesive strength-decreasing layer and an adhesive strength-decreasing layer on the side opposite to the cracked portion side through an adhesive strength-decreasing layer formed by sticking an adhesive. A crack repair layer that is not integrally fixed is formed in the region where the tape or the adhesive is formed , and the floating repair layer is formed on the crack repair layer. It is formed.

The invention according to claim 2, in the repair structure wall according to claim 1, the adhesive strength reduction layer includes a first net, said tape for closing at least a portion of the net opening of the first net or And an adhesive.

The invention according to claim 3, in the repair structure wall according to claim 2, the adhesive strength reduction layer is characterized by having the tape or ears having no adhesive on the periphery of the first net .

The invention according to claim 4, in the repair structure wall according to any one of claims 1 to 3, the filler is characterized in that a polymer cement.

The invention according to claim 5, in the repair structure wall according to any one of claims 1 to 4, to the cracked portion side of the adhesive strength reduction layer is characterized in that the sealing material is disposed.

  The invention according to claim 6 is the wall surface repair structure according to any one of claims 1 to 5, wherein the floating repair layer forms a mortar layer on the crack repair layer, and on the mortar layer. The second net is stuck and the second net is fixed with a pin.

According to the first aspect of the present invention, in the wall surface repair structure, a tape or an adhesive having a specific width W2 that is narrower than the width W1 is attached to a first net having a specific width W1 in a crack portion of the wall surface. A sealing material or filler formed on the cracked portion side of the adhesive strength-decreasing layer and a filler formed on the side opposite to the cracked portion of the adhesive strength-decreasing layer are integrated with each other through the adhesive strength-decreasing layer. In the region where the tape or the adhesive is formed , a crack repair layer that is not integrally fixed is formed, and a floating repair layer is formed on the crack repair layer. The adhesive strength lowering layer in the repair layer blocks the cracks propagating from the cracked part in the crack repair layer, so that the cracks can be prevented from floating and propagating to the repair layer. Prevent the ingress of moisture from the outside It is possible to stop.

Moreover, since cracks are less likely to occur due to the crack repair layer having the adhesive strength lowering layer, it is possible to reliably prevent water from entering by the crack repair layer, and by forming a floating repair layer on the crack repair layer, Further, it is possible to prevent the wall surface from floating due to water intrusion.
Furthermore, since the fine crack which may occur naturally in the future can be protected by the floating repair layer, the durability of the entire wall surface can be improved.

  In addition, since the floating repair layer is formed on the crack repair layer, even if the crack repair layer partially rises, the raised repair layer is covered with the floating repair layer, so that it can be finished to a smooth surface. The appearance of the finished surface is not impaired, and further, the step of brushing for reducing this partial bulge is no longer necessary, and the number of steps can be reduced.

  Furthermore, since the crack repair layer was formed with the adhesive strength reduced layer interposed, even if floating occurred naturally including the repair portion of the crack, it was peeled between the crack portion and the adhesive strength reduced layer, For example, since the sealing material arranged in the cracked part is protected against floating, there is no need to re-repair the cracked part, and the conventional repaired part is removed (hanging process), and in this process There is no dropout of the wall, shortening the construction period of repair work, and no economic loss.

The invention according to claim 2, the adhesive strength reduction layer, because it has a first net, and the tape or pressure-sensitive adhesive for closing at least a portion of the net opening of the first net, the adhesive strength with a simple structure The adhesive force between the layers on both sides of the lowering layer can be easily interrupted, and it is possible to prevent the crack from propagating from one side to the other side. Moreover, it becomes possible to perform the construction of the adhesive strength lowering layer very easily.

The invention according to claim 3, the adhesion strength decreases layer, for having the tape or ears having no adhesive on the periphery of the first net, the higher the adhesive strength of the ear portion, the tape portion or adhesive By configuring the application part to be pulled intensively, peeling between the tape part or adhesive application part and each layer sandwiching them (other part of the crack repair layer or other layer in contact with the crack repair layer) It is possible to actively encourage. And since the force acting on the crack repair layer at the time of crack occurrence is relaxed and the followability of the crack repair layer to the crack on the wall surface is improved, the crack of the crack repair layer can be eliminated and the crack part generated on the wall surface is sealed Can be performed reliably. In addition, since the force acting on the crack repair layer when a crack is generated is reduced, the crack repair layer can be thinned, and the appearance of the wall surface after repair can be improved.

The invention according to claim 4, fillers are the polymer cement, polymer cement itself has elasticity, on at least one side of the adhesive strength reduction layer by with paint, when a crack occurs due to the adhesive strength reduction layer Combined with the effect of relaxing the force acting on the crack repair layer, the followability of the crack repair layer to the cracks on the wall surface can be improved. Further, it is possible to eliminate cracks in the crack repair layer, and it is possible to reliably seal the cracks generated on the wall surface. And since the force which acts on a crack repair layer at the time of a crack generation is eased, a crack repair layer can be made thin and the external appearance of the wall surface after repair can be improved.

According to the fifth aspect of the present invention, since the sealing material is disposed on the crack portion side of the adhesive strength lowering layer , it is possible to further enhance the prevention of water intrusion in the crack portion. Further, even if a crack occurs in the sealing material, the crack is lifted by the crack repairing layer and does not propagate to the repairing layer, so that the infiltration of water by the floating repairing layer can be prevented. Because of such a configuration, the strength of the sealing material is not required, and the operation of shaping the cracked portion at the time of repair with a U or V cut can be omitted.

  According to the invention according to claim 6, the floating repair layer forms a mortar layer on the crack repair layer, a second net is stuck on the mortar layer, and the second net is fixed with a pin. The floating repair layer can be firmly constructed, and fine cracks that may occur in the natural phenomenon in the future can be protected by the floating repair layer, improving the durability of the entire wall surface and the appearance of the finished surface, It is possible to increase the man-hours and shorten the work period, eliminate the use of extra materials, and reduce economic loss.

Hereinafter, the wall surface repair structure according to the present invention will be described in detail.
The present invention is characterized in that, in the wall surface repair structure, a crack repair layer having an adhesive strength lowering layer is formed at a crack portion of the wall surface, and a floating repair layer is formed on the crack repair layer.
As shown in FIG. 1 and FIG. 2, a sealing material 9 is filled in the crack portion 8 of the wall surface 1, a filler 17 is applied on the sealing material 9, and the filler 17 has a function of an adhesive strength decreasing layer. One net 12 is stuck to form a crack repair layer.
A filler 13 is applied as a floating repair layer on the first net 12 to form a flat surface, a second net 14 is attached to the flat surface, and the second net 14 is pressed by the pins 7. To. And the finishing material 15 is apply | coated so that the head of this pin 7 may be hidden as needed.
Here, the filler is a resin-mixed mortar or polymer cement in which a resin is mixed into mortar, cement, water, aggregate (sand).

The embodiment shown in FIG. 3 is a construction method in which the finishing material 15 of the embodiment shown in FIG. 2 is omitted, and the second net 14 is embedded in the filler 13.
Thereby, the process of apply | coating the finishing material 15 can be eliminated, the repair implementation period can be shortened, and the material can be reduced.
Further, in the embodiment shown in FIG. 4, the filler 17 of the embodiment shown in FIGS. 2 and 3 is omitted, and the first net 12 is directly attached to the sealing material 9, thereby shortening the repair execution period and It is intended to save material.

  In the embodiment shown in FIGS. 2 to 4, the first net 12 has a function of an adhesive strength lowering layer. Specifically, as shown in FIG. 5, a double-sided tape 16 is attached to one side of the first net 12. In the embodiment shown in FIGS. 2 and 3, the first net 12 is stuck so that the tape 16 hits the surface of the filler 17. In this way, when the first net 12 is set and fixed with the filler 17 so that the tape 16 hits the surface of the filler 17, when the sealing material 9 and the filler 17 are solidified, the tape 16 and the filler 17 Therefore, even if the crack 8 propagates to the sealing material 9 and the filler 17, it does not propagate to the filler 13. Further, in the embodiment shown in FIG. 4, the first net 12 is stuck so that the tape 16 hits the surface of the sealing material 9. In this way, when the first net 12 is set and fixed with the filler 13 so that the tape 16 hits the surface of the sealing material 9, the tape 16 and the sealing material 9 are solidified when the sealing material 9 and the filler 13 are solidified. In this case, even if a crack occurs in the sealing material 9, it does not propagate to the filler 13.

Further, as shown in FIG. 5, the adhesive strength lowering layer is obtained by sticking a tape 16 having a width W2 to a first net 12 having a width W1. Since this width is affixed to a portion corresponding to the crack portion and exhibits an effect, a certain amount of width is required.
That is, since the cracked part which generate | occur | produced is not normally a straight line, when it is going to affix the tape 16 on this, a certain amount of width | variety is required. Accordingly, the widths W1 and W2 are determined depending on the state of the crack portion. In addition, if the width of the tape 16 is narrow, the followability of cracks is reduced. Conversely, if the width is wide, the tape 16 can be securely attached on the portion corresponding to the cracked portion. The area becomes wider, the adhesive strength of the entire adhesive strength lowering layer becomes too low, and the strength of the crack repairing layer decreases. Further, the cost increases as the widths W1 and W2 become wider. Therefore, the widths W1 and W2 are preferably set in consideration of the crack followability, the adhesive strength of the crack repair layer, the cost, and the like. As an example, the widths W1 = 10 cm and W2 = 5 cm are optimal. However, even if W1 = W2, the function as the tape 16 can be obtained. In FIG. 5, the tape 16 is attached to the first net 12 such as a non-woven fabric, but an acrylic adhesive may be applied directly to the non-woven fabric instead of the tape 16. In short, it is sufficient that the coating material such as the filler does not pass through, and the material is not limited to the tape 16 or the acrylic adhesive.

Here, the crack followability means that the wall surface expands and contracts due to solar heat, the gap of the crack portion changes, and the tensile compression stress generated in the repair portion such as the crack repair layer and the floating repair layer is alleviated.
Adhesive strength (adhesion strength) refers to cohesive failure of materials, interfacial delamination, interfacial book layer delamination, and the like, for example, an adhesive strength decreasing layer (including 12) and a base material as shown in FIG. It is the strength at the time of interfacial peeling between the filler 17 or the adhesive strength lowering layer (including 12) and the filler 13 and the interfacial book layer peeling. And a crack followability is achieved by the interface peeling or interface book layer peeling of the tape which comprises an adhesive strength fall layer.

  As shown in FIG. 5, the tape 16 (or adhesive) is attached around the first net by applying the tape 16 having the width W2 (W2 <W1) to the first net 12 having the width W1 (or applying an adhesive). Ear part without agent is formed. That is, by embedding the ear portion in the filler 17 as the base material, the adhesive strength of the tape 16 can be attached to the base material in a weakened state. That is, in a state where the base material is not solidified, the base material passes through the mesh of the ear part. Thereby, the ear | edge part will be in the state embed | buried under the base material. On the other hand, the portion where the tape 16 is adhered does not transmit the base material. Accordingly, the adhesive strength of the tape 16 is weaker than the adhesive strength of the ear portion, and the tape 16 is attached to the filler 17 which is a base material. As shown in FIG. 2, the mounting range of the tape 16 may be a range that covers a portion corresponding to the crack portion 8. In the embodiment of FIG. 2, it is a part of the sealing material 9. As the material of the tape 16, it is preferable to use a material that does not transmit the coating material.

  In the above embodiment, the filler 17 as the base material is applied on the sealing material 9 and then the tape on which the ears are formed is interposed thereon, but the ears are formed on the sealing material 9. The first net may be covered, and a filler as a base material may be applied thereon. As a result, the base material passes through the ear portion, and the tape is fixed to the wall surface in a state where the ear portion is embedded. And since the base material does not permeate the tape part, the adhesive strength between the tape and the sealing material and between the base material and the tape is weak, and the adhesive strength between the base material and the ear is strong. In this state, the tape can be interposed in the portion corresponding to the crack portion. When the sealing material is not applied, the filler, which is the base material, is directly applied to the cleaned wall surface, and the tape on which the ear portion is formed is put on the filler. Even in this case, the tape should be interposed in the portion corresponding to the cracked part with the adhesive strength between the base material and the tape being weak and the adhesive strength between the base material and the ear being increased. Can do.

  In the above embodiment, the tape is interposed with the tape disposed on the upper surface of the first net 12, but the tape is interposed with the tape positioned on the back surface of the first net 12. You may do it. Also by this, the filler as the base material transmits the ear part and does not transmit the tape part, so the adhesive strength between the base material and the tape is weak and the base material and the ear part are not. The tape can be interposed in the portion corresponding to the crack portion 8 in a state where the adhesive strength is increased.

Next, the floating repair layer will be described.
The coating thickness of the filler 13 is set to a thickness that does not allow the crack repair layer to rise, and is finished to be a smooth surface. In the embodiment shown in FIG. 2, the second net 14 is stuck on the smooth surface of the filler 13, and the second net 14 is fixed with the pins 7. And the finishing material 15 is apply | coated until the head of this pin 7 is hidden.
Moreover, in the Example shown in FIG.3 and FIG.4, after apply | coating the thickness of the filler 13 to the thickness which cannot see the swelling of a crack repair layer, the net | network 14 is stuck before the filler 13 hardens | cures, The pin 7 is driven in and applied so that the head of the pin 7 cannot be seen. This pin 7 is driven firmly to the wall surface 1. The filler 13, the net 14, and the pin 7 are collectively referred to as a floating repair layer. In addition, the driving interval of the pins 7 is not constant depending on the configuration of the wall surface. However, for example, it is about four per square meter.

As the coating material used in the crack repair layer and the floating repair layer, a filler such as mortar is used, and particularly preferably, a material excellent in elasticity, for example, a polymer cement-based coating waterproofing polymer polymer (system) material. Use wood. Usually, an emulsion resin and an aggregate containing cement (Portland, Alumina, etc.) are mixed and applied to use as a base material or a waterproof coating. Depending on the type and amount of emulsion resin and the type and amount of cement and aggregate, properties with a fairly wide range of properties (elasticity) can be obtained.
In the crack repair layer, in particular, polymer cement is preferably used in order to improve crack followability. Furthermore, the coating material used in the crack repair layer or the like is more preferably a polymer cement-based coating material in which the amount of emulsion resin relative to the powder material is 10 to 100%.

The operation and effect of the wall surface repair structure of the present invention will be described.
The crack 8 generates an internal stress on the wall surface 1 due to a temperature difference between the shaded part and the sunlit part due to solar heat or the like, and the internal stress causes a crack. Further, the crack 8 is generated at a portion where the internal stress is concentrated. Once the crack 8 is generated, the internal stress of the wall surface 1 is absorbed and reduced by the crack 8, and the internal stress of the entire wall surface 1 is made uniform. . Therefore, unless the surrounding environment of the building changes, the temperature difference between the shaded part and the sunlit part does not change, and it is considered that no major cracks will occur in other parts in the future. The same applies to drying shrinkage. That is, after a certain period of time, the crack 8 does not occur any more and becomes stable.

  Therefore, first, the sealing material 9 is filled in the visible crack 8. In the state where the generation of the crack 8 is stable, it is considered that no crack is generated other than the crack 8 that can be visually confirmed. In addition, even if cracks occur in other parts, they are extremely minute, and these minute cracks are in close contact with the wall surface 1 via the net 14 and the pin 7, so that the floating repair layer It is possible to protect, and it is possible to prevent moisture from entering from the microcracks.

  FIG. 6 is a diagram schematically showing an analysis of internal stress in the embodiment shown in FIGS. In the figure, the internal stress A in the deep part of the crack 8 is small, and the internal stress B near the surface of the wall surface 1 is large. The internal stress B is propagated to the seal member 9 as the internal stress C. Further, in a state where the internal stress is stable, the internal stress C transmitted to the sealing material 9 is almost zero. Even if the sealing material 9 contracts and propagates to the filler 17 due to the propagation of the internal stress B, the tape 16 attached to the filler 17 and the net 12 is not integrally bonded due to the nature of different materials. And the shrinkage of the filler 17 is not propagated to the filler 13. Therefore, the filler 13 is free from cracks due to the internal stress C of the sealing material 9. The embodiment shown in FIG. 4 has similar operations and effects.

  On the other hand, the crack repair layer is reinforced with the floating repair layer in which the filler 13 is firmly pressed against the wall surface 1 with the second net 14 and the pin 7 against the floating force D. The above function of the crack repair layer can be maintained. Even if a crack occurs in the finishing material 15 (FIG. 2) or the filler 13, moisture does not enter the crack 8. Further, when a non-permeable tape is used for the tape 16, there is no water intrusion into the crack 8. Further, even if floating occurs in the portion including the crack 8, the crack repair layer is protected by the floating repair layer, and the above function of the crack repair layer is maintained, so that water does not enter the crack 8.

In the repair work of the wall surface, the crack repair layer is covered with the filler 13, so there is no need for a brushing process for reducing the rise of the sealing material 9, reducing the number of repair steps, and shortening the work period. be able to. In addition, since the floating repair layer is superimposed on the crack repair layer, the floating repair layer is not dropped as in the conventional case, and the number of man-hours can be reduced.
And, since the crack of the sealing material 9 can be allowed by interposing the tape 16, unlike the conventional case, the crack of the sealing material 9 is prevented by the strength of the crack repairing layer. Therefore, no U or V cut is required, noise and dust are eliminated, and the influence on the living environment can be eliminated.
Furthermore, since the propagation of stress is eased by the tape, the sealing material, the base material, the tape fixing part, the top coating, and the finish coating that constitute the crack repair layer and the floating repair layer do not require the conventional strength. These layers can be made thin, the rise of the repaired portion is lowered, and the appearance of the wall surface after the repair is not impaired. Further, when the base material, the tape fixing portion, the top coating, and the end of the finish coating are configured so as to eliminate the step between the wall surface, the appearance of the repaired wall surface is not impaired.
In particular, since the so-called double net structure in which the first net and the second net having the ears are embedded and the tensile strength of the repaired portion is increased, the occurrence of cracks after repair is prevented and the appearance of the wall surface after repair is impaired. There is nothing.

Next, the test example about the crack followability by the crack repair layer containing the adhesive strength fall layer which is the characteristics of the repair structure of the wall surface of this invention is shown. The following test examples are also disclosed in a previous application (Patent Document 3) by the present inventors.
The test body used for the test is shown in FIGS. The test body shown in FIG. 9 has a sealing material applied thereto, and the test body in FIG. 10 has no sealing material applied thereto. The test body shown in FIG. 9 is a slate plate having a thickness of 3 mm, but a sealing material is applied to the butt portion, a base material on the sealing material, a tape with an ear that becomes an adhesive strength lowering layer, a net fixing layer, a net, It has been coated. The test body shown in FIG. 10 is the same as the test body shown in FIG. 9 except that the sealing material is not applied.
Japanese Patent Application No. 2006-135529 (Application Date: May 15, 2006)

(Explanation of terms in the table)
One-component polyurethane sealant is used for the sealant, and the base material, net fixing layer, and top coat are emulsion liquid material (53% ethylene vinyl acetate resin), cement aggregate (alumina cement, silica sand, etc.) and water Two types of coating materials with different blending ratios were used. In the table, the blending ratio is shown by blending [1] with a coating material of 14: 9: 1.5 of emulsion liquid material: cement aggregate: water and blending coating material of 21: 9: 3.0. [2]

In the table, the treated cloth composite net is a tape having an ear shown in FIG. 5, that is, a so-called tape with an ear.
The net [5] is a net having a mesh size of 5 mm × 5 mm, and a tape is attached to the net. Similarly, the net [3] is a net having a mesh size of 3 mm × 3 mm, and a tape is attached to the net.

(Crack following test)
Two specimens shown in FIG. 9 (with a sealing material applied) and FIG. 10 (without a sealing material applied) were prepared as follows. First, the test body shown in FIG. 9 attaches two slate plates, and affixes a cloth tape on the back surface to fix the two slate plates. Next, urethane (sealing material) having a thickness of 2 mm and a width of 20 mm is applied to the butt portion of the slate plate. Next, after the sealing material is cured, a coating material is applied thereon. Adhere the tape with ears and apply the coating material. Then, after leaving to dry, a coating material was further applied. There are two types of coating materials, [1] and [2]. Therefore, the test body which apply | coated this sealing material produced two types from which a coating material differs.

  On the other hand, the test body shown in FIG. 10 attaches two slate plates, and affixes a cloth tape on the back surface to fix the two slate plates. Next, a coating material is applied to the butt portion of the slate. Adhere the tape with ears and apply the coating material. Then, after leaving to dry, a coating material was further applied. There are two types of coating materials, [1] and [2]. Therefore, the test body which does not apply | coat this sealing material produced two types from which a coating material differs. The curing curing of the specimens shown in FIG. 9 and FIG. 10 was allowed to cure for 14 days in a constant temperature room (20 ° C., 65% RH).

  The crack followability was measured by mounting the test specimen on a tensile tester. The attachment was carried out by the chuck of the tensile tester so that the butt portion of the slate plate was at the center. The chuck interval was 24 cm. And it pulled at the speed | rate of 5 mm / min, and the opening dimension of the butt | matching part of a slate board when the crack produced in the surface of the coating material was measured.

(Adhesion strength test)
The latency of the surface of the concrete board (300 × 300 × 30 mm) is removed with sandpaper to obtain a clean surface. A line assuming cracks is drawn on it. A primer of a sealing material is applied to an eye wider than 2 cm in width around this line, and a -component polyurethane sealing material is processed and cured to a thickness of 2 to 3 mm and a width of about 2 cm. Also, prepare a concrete board that does not treat the sealing material. Apply the mixed [1] or mixed [2] coating material to the concrete plate treated with the sealing material and the untreated concrete plate to a width of about 10 cm, centering on the wire, and leave the uncured tape from above Paste directly. The mixed [1] or mixed [2] coating material is applied onto the ear tape and allowed to stand for a while to dry and cure. Furthermore, the same coating material is applied thereon to form a test specimen. The curing curing was carried out for 14 days by leaving it in a constant temperature room (20 ° C., 65% RH).

  The adhesion strength was measured by conducting an adhesion test using a Kenken tensile tester and confirming the following adhesion strength. The locations where the adhesion test was carried out were (1) where only the coating material was applied, (2) where the coating material and net were combined, and (3) where the coating material, net and nonwoven fabric were combined. (4) Locations where tapes are applied to coating materials, nets and nonwoven fabrics, (5) Locations where tapes are applied to coating materials and nonwoven fabrics, and sealing materials are combined.

  Next, I will explain the results of the test. Tables 1 to 3 show the relationship between the presence / absence of the sealing material and the temperature and the crack followability when the tape with ears which is the adhesive strength lowering layer is used. Test No. in Tables 1 to 3 When 1 and 2 are viewed, the crack followability is almost the same, indicating good followability to each temperature. Further, the followability is better when the sealant is not treated at each temperature. In Tables 1 to 3, Test No. When comparing 1, 2 and 3, 4, it can be seen that the blend [1] has better followability than the blend [2], and the blend of the coating material has an influence on the follow-up.

  Next, looking at Table 4, in the processing cross column, “A” (A) indicates that the adhesion strength is extremely weak regardless of the coating material. In this table | surface, (A) shows what stuck the tape to the nonwoven fabric, and (B) shows what has not stuck the tape only on the nonwoven fabric.

(Comprehensive evaluation)
In Tables 1 to 3, the presence or absence of the sealing material and the composition of the coating material have some influence, but by using the ear-attached tape that is the adhesive strength lowering layer, the crack followability is about 4 mm regardless of the temperature. A large value is shown, and the effect of the ear tape can be confirmed. And in order to support this, in Table 4, the adhesion strength can be made extremely low by using the ear tape. That is, what can be said from Tables 1 to 3 and Table 4 can be said that the crack followability is improved by partially reducing the adhesion strength at the tape portion.
Moreover, from the results of Tables 1 to 4, the crack followability is better in the absence of the sealing material than in the case where the sealing material is applied, and the same actions and effects can be expected.

As described above, according to the present invention, it is possible to provide a wall surface repair structure that improves the durability of the entire wall surface and the appearance of the finished surface, increases the number of steps, and shortens the work period.
Further, in repairing cracks, it is possible to provide a wall surface repair structure that eliminates U or V cuts and has no influence on the living environment.

It is a perspective view which shows one Example of this invention. It is a longitudinal cross-sectional view of FIG. It is a longitudinal cross-sectional view which shows another Example. It is a longitudinal cross-sectional view which shows another Example. It is a top view of a net with a tape. It is the schematic diagram which analyzed the internal stress in a crack part. It is a longitudinal cross-sectional view of a prior art example. It is a longitudinal cross-sectional view of another conventional example. It is a figure which shows a test body (with sealing process). It is a figure which shows a test body (no sealing process).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wall surface 2 Filler 3 Tile 4 Base material 5 Net 6 Finishing material 7 Pin 8 Crack 9 Sealing material 10 Filler 11 V cut part 12 Net 13 Filler 14 Net 15 Finishing material

Claims (6)

In the wall repair structure,
The cracked portion of the wall, through the tape or formed by adhering the adhesive bonding strength reduction layer of a specific width W2 is narrower than the width W1 in the first net specific width W1, the adhesive strength reduction layer The sealing material or filler formed on the cracked portion side of the adhesive and the filler formed on the side opposite to the cracked portion side of the adhesive strength reducing layer are integrally fixed, and the tape or adhesive is formed. the area to form a crack repair layer that is not the integral fixation,
A wall surface repair structure, wherein a floating repair layer is formed on the crack repair layer. In the repair structure wall according to claim 1, the adhesive strength reduction layer, comprising: the first network, and the tape or pressure-sensitive adhesive for closing at least a portion of the net opening of the first net The wall repair structure. In the repair structure wall according to claim 2, the adhesive strength reduction layer repair structure wall which comprises said tape or ears having no adhesive on the periphery of the first net. In the repair structure wall according to any one of claims 1 to 3, the filler is repaired structure wall, characterized in that a polymer cement. In the repair structure wall according to any one of claims 1 to 4, repair structure wall to the cracking portion of the adhesive strength reduction layer, characterized in that the sealing material is disposed.   The wall surface repair structure according to any one of claims 1 to 5, wherein the floating repair layer forms a mortar layer on the crack repair layer, and a second net is stuck on the mortar layer, A wall surface repair structure characterized in that the second net is fixed with a pin.

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