JP2009097250A - Wall surface structure of alc panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wall surface structure of an ALC panel enabling the suppression of occurrence of cracks in the gap part between ALC panels, enabling the prevention of occurrence of cracks in the entire gap part between the ALC panels even if cracks occur in a sealing material, enabling assured sealing, and improving the aesthetic appearance of a finished wall surface. <P>SOLUTION: In this wall surface structure of an ALC panel, crack protective layers 9, 17, 12 each having an adhesive strength reduced layer are formed in the gap part 8 between ALC panels. Desirably, the adhesive strength reduced layer comprises a first net 12 and a tape or an adhesive agent for closing at least a part of the net openings of the first net. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wall surface structure of an ALC panel, and in particular, prevents moisture from entering from a gap between the ALC panels, and also corrodes the support metal fittings of the ALC panel generated due to the penetration of moisture. The present invention relates to a wall structure of an ALC panel that prevents the ALC panel from falling off.

In recent years, ALC panels (Autoclaved Lightweight Aerated Panels) have been used as new building materials.
As shown in FIG. 10, this ALC panel enforcement structure is a joint fitting comprising an ALC panel 22 manufactured to a standard size at a factory equipped with a receiving angle 23, a slide flat plate 18, an angle piece 19, and the like. It fixes to the steel frame 20 of a building via.
The gap between the ALC panels 22 is sealed with a sealing material 21.

By the way, in the wall surface using the ALC panel shown in FIG. 10, since it is being fixed to the steel frame of the building through the joint metal fitting, it behaves differently between the building and the wall surface during an earthquake. .
As a result, the sealing material 21 and the ALC panel 22 may be peeled (cracked). Moisture enters from the peeled (cracked) portion, the joint fitting is corroded, and the ALC panel 22 falls off. There is a problem in terms of durability.

On the other hand, various countermeasures have been taken against cracks and wall floats that have occurred on the walls of concrete walls, mortar walls, tiles, bricks, and the like.
Specifically, for floating the wall surface, as shown in FIG. 8, the filler 2 is applied to the wall surface 1 to fix the tile 3, and the net 5 is attached to the surface of the tile 3. The base material 4 was applied so that 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

Further, as a construction method for preventing moisture from entering from the crack, as shown in FIG. 9, 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 for wall surfaces 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. 9, the cracked wall surface is U-cut or V-cut 11 along the crack 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.

When the repair method for these wall surfaces is applied to the wall structure of the ALC panel, the same problem as in the case of the wall surfaces still arises.
Specifically, there are the following problems to be improved.
First, as a first problem, the occurrence of cracks between the ALC panel and the sealing material or in the sealing material itself occurs naturally, so it may be present at the present stage where the crack can be confirmed visually, but it will occur in the future. There are many possibilities, and repairs must be made each time, and there is a problem in terms of durability of the entire wall surface of the ALC panel.
As a second problem, the repair of the crack shown in FIG. 9 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, since the tensile and compressive forces that generate cracks due to thermal expansion or contraction are larger than the tensile and compressive strength of the sealing material, the cracks propagate to the sealing material itself, and cracks occur in the sealing material itself. There is a problem in terms of durability of the entire wall surface of the ALC panel.

Next, the ALC panel itself and the sealing member between the panels may also have a wall floating. The first problem with such a floating is that the wall floating also occurs naturally. Therefore, for example, when a float occurs including a repaired portion of a crack, the repair of the cracked portion may be damaged, and it is necessary to repair the cracked portion again to repair the float shown in FIG. is there.
This repairing of the crack portion has a problem that an extra step is required since the repair portion shown in FIG. 9 must first be removed (hanging process) 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.

The present invention suppresses the occurrence of cracks in the gap between the ALC panels, and even if a crack occurs in the sealing material, prevents the entire gap between the ALC panels from cracking, An object of the present invention is to provide a wall surface structure of an ALC panel that reliably performs sealing and further improves the appearance of the finished wall surface.
Furthermore, an object of the present invention is to provide a wall structure of an ALC panel that improves the durability of the entire wall surface of the ALC panel and the appearance of the finished surface, thereby increasing the number of steps and shortening the work period.
In addition, when forming the wall structure of the ALC panel, the object is to eliminate the U or V cut and eliminate the influence on the living environment.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that in the wall surface structure of the ALC panel, a crack protective layer having an adhesive strength decreasing layer is formed in a gap portion between the ALC panels.

  The invention according to claim 2 is the wall surface structure of the ALC panel according to claim 1, wherein the adhesive strength lowering layer is a tape for closing the first net and at least a part of the net opening of the first net. And an adhesive.

  According to a third aspect of the present invention, in the wall surface structure of the ALC panel according to the second aspect, the adhesive strength-decreasing layer has an ear portion having no tape or adhesive around the first net. .

  The invention according to claim 4 is the wall surface structure of the ALC panel according to any one of claims 1 to 3, wherein the crack protective layer includes a polymer cement.

  According to a fifth aspect of the present invention, in the wall surface structure of the ALC panel according to any one of the first to fourth aspects, a sealing material is disposed on the gap portion side of the crack protective layer.

  The invention according to claim 6 is characterized in that, in the wall surface structure of the ALC panel according to any one of claims 1 to 5, a float prevention layer is formed on the crack protection layer.

  The invention according to claim 7 is the wall surface structure of the ALC panel according to claim 6, wherein the anti-floating layer forms a mortar layer on the crack protective layer, and a second net is formed on the mortar layer. The second net is attached and fixed with a pin.

  According to the first aspect of the present invention, in the wall structure of the ALC panel, since the crack protective layer having the adhesive strength lowering layer is formed in the gap between the ALC panels, it is possible to suppress the propagation of the crack to the entire crack protective layer. It is possible to prevent moisture from entering from.

  Furthermore, since the crack protective layer was formed by interposing the adhesive strength lowering layer, even if floating occurred naturally including the repaired portion of the crack, it peeled between the crack portion and the adhesive strength lowering layer, For example, since the sealing material disposed in the gap portion of the ALC panel is protected against floating, there is no need to re-repair the cracked portion, and the conventional repaired portion is removed (hanging process), and There is no dropout of the wall accompanying this process, the repair work period is shortened, and there is no economic loss.

  According to the invention of claim 2, the adhesive strength lowering layer has the first net and the tape or pressure-sensitive adhesive for closing at least a part of the net opening of the first net. It is possible to easily block the adhesive force between the layers on both sides of the layer, and 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.

  According to the invention of claim 3, the adhesive strength lowering layer has an ear portion that does not have a tape or an adhesive around the first net, so that the adhesive strength of the ear portion is increased, and the tape portion or the adhesive is applied By constructing the part so as to pull it intensively, the tape part or the adhesive-applied part and the layers sandwiching them (the other part of the crack protective layer or the other layer in contact with the crack protective layer) are actively peeled off. Promptly. Since the force acting on the crack protective layer when cracks are generated and the followability of the crack protective layer to the cracks in the gaps between the ALC panels is improved, the cracks in the entire crack protective layer can be eliminated, and the gap It is possible to reliably seal cracks generated in the part. In addition, since the force acting on the crack protective layer when cracks are generated is reduced, the crack protective layer can be thinned, and the appearance of the wall surface of the ALC panel can be improved.

  According to the invention of claim 4, since the crack protective layer has polymer cement, the polymer cement itself has elasticity, and is applied to at least one side of the adhesive strength lowering layer, whereby the crack caused by the adhesive strength lowering layer is obtained. Combined with the effect of mitigating the force acting on the crack protective layer when it occurs, it becomes possible to improve the followability of the crack protective layer to the crack in the gap between the ALC panels. Further, it is possible to eliminate cracks in the crack protective layer, and to reliably seal cracks generated in the gaps. And since the force which acts on a crack protective layer at the time of a crack generation is eased, a crack protective layer can be made thin and the external appearance of the wall surface of an ALC panel can be improved.

  According to the fifth aspect of the present invention, since the sealing material is disposed on the gap portion side of the crack protective layer, it becomes possible to further enhance the prevention of water intrusion in the gap portion. Moreover, even if a crack occurs in the sealing material, the crack does not propagate to the entire crack protective layer due to the crack protective layer having the adhesive strength lowering layer, and water penetration by the crack protective layer can be prevented. Due to such a configuration, the strength of the sealing material is not required, and the operation of shaping the ALC panel portion that contacts the sealing material into a U or V cut can be omitted.

According to the invention according to claim 6, since the anti-floating layer is formed on the crack protective layer, in addition to the effect of preventing water from entering by the crack protective layer, by forming the anti-floating 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 anti-floating layer, the durability of the entire wall surface of the ALC panel can be improved.

  In addition, since the anti-floating layer is formed on the crack protective layer, even if the crack protective layer partially swells, the raised part is covered by the anti-floating layer and 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.

  According to the invention of claim 7, the anti-floating layer forms a mortar layer on the crack protective layer, a second net is stuck on the mortar layer, and the second net is fixed with a pin. The anti-floating layer can be firmly constructed, and fine cracks that may occur naturally in the future can be protected by the anti-floating layer, and the durability of the entire ALC panel wall and the appearance of the finished surface are improved. This improves the man-hours and shortens the work period, eliminates the use of extra materials, and reduces economic loss.

Hereinafter, the wall structure of the ALC panel according to the present invention will be described in detail.
The present invention is characterized in that, in the wall structure of the ALC panel, a crack protective layer having an adhesive strength lowering layer is formed in a gap portion between the ALC panels.
As shown in FIG. 1, a sealing material 9 is filled in the gap 8 of the ALC panel 1, a filler 17 as a base material is provided, and a first net 12 having a function of an adhesive strength lowering layer is attached to the filler 17. To form a crack protection layer.
In FIG. 1, the second net 14 and the filler 13 forming the net fixing layer and the overcoat layer are arranged on the crack protective layer.
In addition, although the sealing material 9 is shown by FIG. 1, this sealing material 9 can also be eliminated.

  Further, as shown in FIG. 1, the crack protective layer and the layer formed thereon are preferably formed smoothly and thinly toward the end so that there is no step between the surface of the ALC panel 1. .

  Next, the wall structure of the ALC panel in which the anti-floating layer is formed on the crack protective layer having the adhesive strength lowering layer, which is another embodiment relating to the wall structure of the ALC panel of the present invention, will be described. Hereinafter, although it demonstrates centering on the case where it has a float prevention layer, the technical content explained in full detail below is also what does not have a float prevention layer like FIG. 1 which is an example of the wall surface structure of the ALC panel of this invention. Needless to say, this is true.

As shown in FIG. 2 and FIG. 3, the gap portion 8 of the ALC panel 1 is filled with a sealing material 9, a filler 17 is applied on the sealing material 9, and the filler 17 has a function of an adhesive strength lowering layer. The first net 12 is adhered to form a crack protective layer.
A filler 13 is applied on the first net 12 as a floating prevention layer 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. 4 is a construction method in which the finishing material 15 of the embodiment shown in FIG. 3 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, and the implementation period can be shortened and the material can be reduced.
Further, in the embodiment shown in FIG. 5, the filler 17 of the embodiment shown in FIGS. 3 and 4 is omitted, and the first net 12 is directly attached to the sealing material 9, thereby shortening the construction period and the material. This is intended to save the amount of money.

  In the embodiment shown in FIGS. 3 to 5, the first net 12 has a function of an adhesive strength lowering layer. Specifically, as shown in FIG. 6, the double-sided tape 16 is attached to one side of the first net 12. In the embodiment shown in FIGS. 3 and 4, 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. In the embodiment shown in FIG. 5, the first net 12 is attached 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.

In addition, as shown in FIG. 6, the adhesive strength lowering layer is obtained by attaching 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 gap between the ALC panels and exhibits an effect, a certain amount of width is required.
Therefore, the widths W1 and W2 are determined according to the state of the gap. In addition, if the width of the tape 16 is narrow, the crack followability is lowered. Conversely, if the width is wide, the tape 16 can be reliably attached on the portion corresponding to the gap portion. The area becomes wider, the adhesive strength of the entire adhesive strength lowering layer becomes too low, and the strength of the crack protective layer decreases. Further, the cost increases as the widths W1 and W2 become wider. Accordingly, the widths W1 and W2 are preferably set in consideration of the crack following ability, the adhesive strength of the crack protective 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. Although FIG. 6 shows the tape 16 attached to the first net 12 such as a nonwoven fabric, an acrylic adhesive may be applied directly to the nonwoven 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 ALC panel expands and contracts due to solar heat, the gap of the gap changes, and the tensile compression stress generated in the construction part such as the crack protective layer and the anti-floating layer is alleviated. .
Adhesive strength (adhesion strength) refers to cohesive failure of materials, interfacial delamination, interfacial book layer delamination, and the like, for example, as shown in FIGS. 1 to 3, an adhesive strength decreasing layer (including 12) and a base material. 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. 6, the tape 16 (or adhesive) is attached around the first net by sticking (or applying adhesive) the tape 16 having the width W2 (W2 <W1) to the first net 12 having the width W1. 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. The mounting range of the tape 16 may be a range that covers a portion corresponding to the gap 8 as shown in FIG. In the embodiment of FIG. 3, 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 a portion corresponding to the gap 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 is interposed in the portion corresponding to the gap portion in a state where the adhesive strength between the base material and the tape is weak and the adhesive strength between the base material and the ear portion is 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 a portion corresponding to the gap portion 8 in a state where the adhesive strength is increased.

Next, the anti-floating layer will be described.
The coating thickness of the filler 13 is set so as not to allow the crack protection layer to rise, and is finished so as to be a smooth surface. In the embodiment shown in FIG. 3, 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.4 and FIG.5, after apply | coating the thickness of the filler 13 to the thickness which cannot see the rise of a crack repairing 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 ALC panel 1. The filler 13, the net 14, and the pin 7 are collectively referred to as a floating prevention layer. Moreover, although the driving interval of the pins 7 is not constant depending on the configuration of the ALC panel, for example, it is about four per square meter.

As the coating material used in the crack protective layer and the anti-floating 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 protective layer, a polymer cement is particularly preferably used in order to improve crack followability. Furthermore, it is more preferable that the coating material used in the crack protective layer or the like is a polymer cement coating material in which the resin amount of the emulsion with respect to the powder material is 10 to 100%.

The operation and effect of the wall surface structure of the ALC panel of the present invention will be described.
In the gap portion 8 of the ALC panel, an internal stress is generated in the ALC panel 1 due to a temperature difference between the shaded portion and the sunlit portion due to solar heat or the like, and the interval between the gap portions changes due to the internal stress. In addition, the change of the gap 8 occurs remarkably in the portion where the internal stress is concentrated, and once the crack is generated in the sealing material 9 or other filler in the gap due to the change of the gap, the ALC panel The internal stress of 1 is absorbed and reduced by the crack, and the internal stress of the entire ALC panel 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, cracks do not occur any more and become stable.

First, the sealing material 9 is filled in the gap 8 of the ALC panel.
Basically, when a visible crack occurs in a place other than the gap portion 8, the crack is assumed to be a gap portion, and similarly, a crack protective layer and a float prevention layer can be provided. Also, even if cracks occur in other parts, if they are extremely small, the filler 13 is in close contact with the wall surface 1 via the net 14 and the pin 7, so that it is protected with a floating prevention layer. It is possible to prevent moisture from entering from the minute cracks.

  FIG. 7 is a diagram schematically showing an analysis of internal stress in the embodiment shown in FIGS. 3 and 4. In the figure, the internal stress A in the deep part of the gap 8 is small, and the internal stress B near the surface of the ALC panel 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. 5 has the same operation and effect.

  On the other hand, the crack protective layer is in a state reinforced by the anti-floating layer in which the filler 13 is firmly bonded to the ALC panel 1 by the second net 14 and the pin 7 against the floating force D. The function of the crack protective layer can be maintained. Even if the finishing material 15 (FIG. 3) or the filler 13 is cracked, no moisture enters the gap 8. Further, when a non-water-permeable tape 16 is used, there is no moisture intrusion into the gap 8. In addition, even if floating occurs in the portion including the gap portion 8, the crack protection layer is protected by the floating prevention layer, and the above function of the crack protection layer is maintained. Absent.

In ALC panel wall construction, the crack protection layer is covered with filler 13, so there is no need for a brushing process to reduce the swelling of the sealing material 9, reducing the number of construction steps and shortening the construction period. can do. In addition, since the anti-floating layer is applied on the crack protective layer, the anti-floating layer does not fall off as in the prior art, and the number of man-hours can be reduced.
Then, since the crack of the sealing material 9 can be allowed by interposing the tape 16, unlike the conventional case, which prevents the sealing material 9 from being cracked by the strength of the crack protective layer, as in the conventional case. This eliminates the need for U- or V-cutting and shaping an ALC panel, eliminates the generation of noise and dust, and eliminates the influence on the living environment.
Furthermore, since the propagation of stress is eased by the tape, the sealing material, base material, tape fixing part, top coating and finish coating, etc. that constitute the crack protection layer and the anti-floating layer, etc. 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 gap portion is increased, the occurrence of cracks after construction is prevented and the appearance of the wall surface after construction is impaired. There is nothing.

Next, the test example about the crack followability by the crack protective layer containing the adhesive strength fall layer which is the characteristic of the wall surface structure of the ALC panel 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. 11 has a sealing material applied thereto, and the test body in FIG. 12 has no sealing material applied thereto. The test body shown in FIG. 11 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, an ear-attached tape that becomes an adhesive strength lowering layer, a net fixing layer, a net, It has been coated. The test body shown in FIG. 12 is the same as the test body shown in FIG. 11 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. 6, 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 test specimens shown in FIG. 11 (with a sealing material applied) and FIG. 12 (without a sealing material applied) were prepared as follows. First, the test body shown in FIG. 11 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. 12 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 FIGS. 11 and 12 was allowed to stand 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 affects 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 suppress the occurrence of cracks in the gaps between the ALC panels, and even if cracks occur in the sealing material, the entire gaps between the ALC panels are cracked. It is possible to provide a wall surface structure of an ALC panel that prevents occurrence, reliably seals, and further improves the appearance of the finished wall surface.
Furthermore, according to the present invention, it is possible to provide a wall surface structure of an ALC panel that improves the durability of the entire wall surface of the ALC panel and the appearance of the finished surface, increases the number of steps, and shortens the work period. In addition, when forming the wall surface structure of the ALC panel, it is possible to eliminate the U or V cut and eliminate the influence on the living environment.

It is sectional drawing which shows the 1st Example of this invention. It is a perspective view which shows the 2nd 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 gap | interval 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 the schematic explaining the wall surface structure of an ALC panel. 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

1 ALC panel (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 (7)

In the wall structure of the ALC panel,
A wall surface structure of an ALC panel, wherein a crack protective layer having an adhesive strength lowering layer is formed in a gap between the ALC panels.   2. The wall structure of an ALC panel according to claim 1, wherein the adhesive strength lowering layer has a first net and a tape or an adhesive for closing at least a part of the net opening of the first net. The wall structure of the ALC panel.   The wall structure of an ALC panel according to claim 2, wherein the adhesive strength lowering layer has an ear portion having no tape or adhesive around the first net.   The wall surface structure of an ALC panel according to any one of claims 1 to 3, wherein the crack protective layer includes a polymer cement.   5. A wall surface structure of an ALC panel according to claim 1, wherein a sealing material is disposed on the gap portion side of the crack protective layer. In the wall surface structure of the ALC panel according to any one of claims 1 to 5,
A wall surface structure of an ALC panel, wherein an anti-floating layer is formed on the crack protective layer.   The wall structure of an ALC panel according to claim 6, wherein the anti-floating layer forms a mortar layer on the crack protective layer, and a second net is stuck on the mortar layer, A wall surface structure of an ALC panel, characterized in that it is fixed with a pin.

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