JP2016204860A - Design panel, wall structure and construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a design panel, a wall structure and a construction method, which enable the design panel for use as a new exterior wall to be simply laid with high reliability on an ALC exterior wall panel.SOLUTION: A design panel for lap joint, which is lap-jointed on an exterior wall panel made of ALC, is made of autoclaved lightweight concrete. In the design panel having a predetermined design applied to a surface, its compressive strength is lower than that of the exterior wall panel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a design panel for exterior reform, a wall structure, and a construction method in which a new design panel is stretched on an existing outer wall panel.

  In recent years, panels (ALC panels) made of autoclaved lightweight aerated concrete (hereinafter referred to as ALC) have been used as exterior materials for buildings. In particular, since ALC panels are lightweight and exhibit high fire resistance and heat insulation, there are an increasing number of homes that use ALC panels to form outer walls. Even in such a house, since the coating material on the surface deteriorates with time, it is necessary to repair the deteriorated portion. Therefore, there is a case where a process for returning a deteriorated portion to a state similar to that at the time of new construction or a so-called renovation for repairing with a specification different from that at the time of new construction may be performed.

  Conventionally, in order to renovate the outer wall of a building, the surface is generally repainted by spraying and finished. However, when painting is performed by spraying, there are problems such as scattering of paint to neighboring buildings and increase of environmental load due to volatilization of organic solvent in the paint. This problem becomes more serious in densely populated areas such as urban areas. On the other hand, in recent years, attempts have been made to carry out renovation of the outer wall without repainting. In this method, the exterior is renewed by overlaying a new outer wall panel on the existing outer wall surface that has become old (see, for example, Patent Document 1).

JP-A-11-62171

However, when an ALC panel is used for the outer wall, the surface strength of the ALC outer wall panel is low and brittle. Conventionally, the surface of the ALC outer wall panel has been subjected to heavy finishing such as stone coating and mortar coating, or heavy objects have been applied to the ALC wall. Screwing has been avoided.
Since ALC has low strength and is brittle, the screw is difficult to work, and even if it is screwed, there is a problem in that the screw periphery collapses with a little overtightening and the pulling strength of the screw decreases. Even in the long term, if the surroundings of the screw collapse due to repeated drawing or shearing, it will lead to a decrease in the screw drawing strength. In addition, if a screw is driven into the non-muscle portion at the end of the ALC outer wall panel, there is a possibility that it will eventually split.
Therefore, conventionally, when attaching a heavy object to the ALC outer wall panel, it is fixed to the building frame instead of the ALC outer wall panel, or when fixed to the ALC outer wall panel, a penetrating or expanding anchor is used. It was attached. Finishing with a light molded plate has been attached to the barrel edge bolted to the thick ALC outer wall. However, these methods have poor workability.

  Due to the above circumstances, the existing ALC outer wall panel has been renovated as follows. For example, the current mainstream method is repainting, but it is a “recovery” of aesthetics and cannot be said to improve design. Other methods include bonding tiles / decorative sheets, attaching the new outer wall to the chassis, and removing the existing ALC outer wall panel and attaching the new outer wall, all of which are effective in improving design. However, there were problems such as the adhesive strength being affected by the uncertain adhesion strength of existing coatings and the construction becoming large.

  The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a design panel that becomes a new outer wall easily and reliably on an ALC outer wall panel. It is in providing a design panel, a wall structure, and a construction method.

As a result of continuing intensive studies, the present inventors have found that the above problems can be solved by defining the compressive strength between the ALC outer wall panel and the design panel, and have completed the present invention.
That is, the present invention is as follows.
[1]
A design panel for laying on an outer wall panel made of lightweight cellular concrete (ALC) cured by an autoclave,
Made of lightweight cellular concrete, with a given design applied to the surface,
A design panel, wherein the compressive strength is lower than the compressive strength of the outer wall panel.
[2]
The design panel. Fixed on the outer wall panel by screws,
The design panel according to [1], wherein the indentation strength when pressing the head seating surface of the screw against the design panel is smaller than the pull-out strength of the screw driven into the outer wall panel. .
[3]
The design panel according to [1] or [2], wherein the lightweight cellular concrete forming the design panel has a lower specific gravity than the ALC forming the outer wall panel.
[4]
A wall structure, wherein the design panel according to any one of [1] to [3] is screwed to an outer wall panel made of ALC.
[5]
It has a heat insulation layer provided between the said outer wall panel and the said design panel, The wall structure as described in [4] characterized by the above-mentioned.
[6]
In the surface of the outer wall panel, it has an adhesive layer provided in the vicinity of the place where the screw is driven,
The wall structure according to [4] or [5], wherein the height of the adhesive layer is equal to or higher than the uneven height of the outer wall panel surface.
[7]
[4] to [6], wherein the design panel is fixed to the outer wall panel in combination with at least one penetration type or expansion type anchor in addition to the screw. Wall structure as described in.
[8]
In the construction method in which the design panel according to any one of [1] to [3] is overlaid by screwing on the outer wall panel,
Compressive strength of the design panel and / or dimensional shape of the screw,
Screw pull-out strength in the outer wall panel> The construction method is characterized in that selection is made so that the relationship of the indentation strength of the head seating surface of the screw in the design panel is established.
[9]
The construction method according to [8], wherein the screw is driven into the design panel without performing the pilot hole processing and / or dishing processing for the screw in advance.

  According to the present invention, the compressive strength of the design panel as the new outer wall is made lower than the compressive strength of the existing ALC outer wall panel, so that it is simply and highly reliable on the ALC outer wall panel. A design panel, a wall structure, and a construction method that can be provided can be provided.

It is a disassembled perspective view which shows an example of the wall structure of this invention. It is sectional drawing which shows an example of the wall structure of this invention. It is sectional drawing which shows an example of the wall structure of this invention. It is sectional drawing which shows an example of the wall structure of this invention. It is a figure which shows the relationship between the drawing strength of a screw, and the penetration strength of a screw.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing an example of the wall structure of the present invention, FIG. 1 is an exploded perspective view, and FIG. 2 is a cross-sectional view.
The wall structure 1 of the present invention is obtained by fixing a design panel 10 made of lightweight cellular concrete to an outer wall panel (ALC outer wall panel 20) made of autoclaved lightweight aerated concrete (ALC) with screws 2 (screwing). .
In addition, the design panel 10 of the present invention is a design panel for overlaying that is overlaid on the outer wall panel 20 made of ALC, which is made of lightweight cellular concrete and has a predetermined design applied to the surface. The compressive strength is lower than the compressive strength of the outer wall panel (ALC outer wall panel 20).
In the present invention, the design panel 10 made of lightweight cellular concrete is attached to the existing ALC outer wall panel 20 (so as to cover the ALC outer wall panel 20) with screws. Thereby, the external appearance of a building is renewed and design nature improves.

In this specification, the outer wall panel 20 is made of lightweight cellular concrete (ALC) cured by autoclave (high temperature and high pressure steam), and this ALC outer wall panel 20 is a narrowly-defined ALC, that is, a panel made of ALC corresponding to JIS A5416. I will say this mainly.
Such an ALC panel includes a thick type (≧ 75 mm) and a thin type (<75 mm). In the present embodiment, a thick ALC panel is assumed as the existing ALC outer wall panel 20. The specific gravity of such an ALC panel is, for example, 0.45 to 0.55, and the compressive strength is, for example, 3 N / mm ² or more. The ALC outer wall panel 20 is, for example, a rectangular plate having a thickness of 100 mm, a width of 600 mm, and a length of 3000 mm.
Moreover, in this specification, the design panel 10 shall mean the panel in general which consists of ALC in a broad sense as lightweight cellular concrete. The specific gravity of such lightweight cellular concrete is, for example, 0.25 to 0.40, and the compressive strength is, for example, 2.5 to 3 N / mm ² .
Further, the design panel 10 is provided with irregularities, grooves and the like representing various patterns on the surface thereof.

The design panel 10 of the present invention is a reforming panel that is overlaid on an existing outer wall panel 20 of a building such as a house. The building outer wall panel 20 refers to a wall covering the outermost periphery of a building, and refers to an ALC outer wall panel. The term “overlapping” refers to pasting on the outer wall panel 20 without removing the existing outer wall panel 20. At this time, if the existing outer wall needs to be repaired, the design panel 10 may be pasted after being repaired as appropriate.
The design panel 10 is attached by screws 2 so as to cover the existing ALC outer wall panel 20. Thereby, the external appearance of a building can be renewed without removing the existing ALC outer wall panel 20 or repainting, and workability can be improved.

As described above, conventionally, it has been avoided to screw a heavy object such as a design panel to the ALC outer wall. In the present invention, the reason why the design panel can be screwed to the outer wall of the ALC is mainly based on the following grounds.
(1) The design panel 10 can be made softer (lower compression strength) than the ALC outer wall panel 20 to prevent the screws 2 from being overtightened.
(2) By making the design panel 10 the same quality as the ALC outer wall panel 20, the linear expansion coefficient becomes substantially the same, and the temperature expansion and contraction difference between the design panel 10 and the ALC outer wall panel 20 can be eliminated. Thereby, loosening of the screw 2 due to the difference in temperature expansion and contraction can be prevented.
(3) By making the design panel 10 have substantially the same module (dimensions) as the ALC outer wall panel 20, the design panel 10 is prevented from being stretched across the existing ALC outer wall panel 20. Thereby, it can prevent that the circumference | surroundings of the screw | thread 2 collapse | crumbled by an earthquake etc., for example, and screw extraction strength falls.
(4) The use of the adhesive in addition to the screw 2 for the attachment of the design panel 10 can prevent the design panel 10 from dropping off. The main purpose of the adhesive is to absorb unevenness of the surface of the ALC outer wall panel 20.
Hereinafter, (1) to (4) will be described in detail.

(1) The material of the design panel 10 is softer than the existing ALC outer wall.
The design panel 10 of the present invention is a design panel 10 for overlaying that is overlaid on an outer wall panel 20 made of ALC, which is made of lightweight cellular concrete and has a predetermined design applied to the surface. The compression strength is lower than the compression strength of the outer wall panel.
By making the material of the design panel 10 softer than the existing ALC outer wall panel 20, the screw 2 screwed into the ALC outer wall panel 20 does not lose the penetration of the screw head into the soft design panel 10. become. As a result, overtightening and idle rotation of the screw 2 are prevented, and the screw 2 can be reliably applied to the ALC outer wall panel 20. Moreover, even if an expansion / contraction difference occurs between the outer wall panel 20 and the design panel 10, the periphery of the screw 2 in the outer wall panel 20 having a high compressive strength is not easily collapsed, and a decrease in the screw drawing strength can be suppressed.

(2) The design panel 10 is made of cellular concrete having a specific gravity lower than that of the ALC outer wall panel 20.
As described above, the ALC that forms the existing outer wall panel 20 is mainly an ALC in a narrow sense corresponding to JIS A5416, but the lightweight cellular concrete that forms the design panel 10 is an ALC in a broad sense.
By making the design panel 10 made of lightweight cellular concrete of the same quality as the existing ALC outer wall panel 20, familiarity when the design panel 10 is attached to the ALC outer wall panel 20 is improved. Since the linear expansion coefficients of the design panel 10 and the ALC outer wall panel 20 are substantially the same, and a difference in expansion and contraction due to temperature change is unlikely to occur, it is possible to suppress a reduction in screw pullout strength due to the surroundings of the screw 2 being collapsed. Moreover, high incombustibility, heat insulation, and moisture permeability are realizable by making the design panel 10 into the product made from lightweight cellular concrete.

  Furthermore, by making the design panel 10 made of lightweight cellular concrete, the specific gravity becomes low (light), and the load on the building can be suppressed. In particular, the lightweight cellular concrete that forms the design panel 10 has a lower specific gravity than the ALC that forms the existing outer wall panel 20. There is a certain correlation between the specific gravity and softness of the panel, and in general, the panel can be softened by reducing the specific gravity. That is, by making the design panel 10 have a specific gravity lower than that of the existing ALC outer wall panel 20, the design panel 10 can generally be made softer than the existing ALC outer wall panel 20. In the design panel 10, “softness” is more important than the specific gravity itself. Lowering the specific gravity is an effective means that can ensure a predetermined softness relatively easily.

  Specifically, the specific gravity of the design panel 10 is preferably 90% or less of the specific gravity of the ALC outer wall panel 20, and preferably 80% or less. For example, when the specific gravity of the ALC outer wall panel 20 is 0.50 which is the center value of the JIS standard, the specific gravity of the design panel 10 is 0.45 at 90% of the ALC outer wall panel 20 and is 0.40 at 80%. . In addition, since cellular concrete has specific gravity distribution by foaming height, the specific gravity as used in this specification is made into the specific gravity value in the center part of foaming height. Moreover, since the specific gravity of cellular concrete also changes depending on the moisture content, the specific gravity referred to in the present specification is a specific gravity value at the time of absolutely dry.

(3) The dimension of the design panel 10 shall be substantially equal to the existing ALC outer wall panel 20.
In particular, the lengths of the short sides of the ALC outer wall panel 20 and the design panel 10 are made substantially equal. As a result, the design panel 10 can be prevented from being stretched across the existing ALC outer wall panel 20, so that the earthquake resistance of the building is not impaired. Moreover, it is suppressed that the circumference | surroundings of the screw 2 collapse | crumble and screw extraction strength falls. This is particularly effective when the existing ALC outer wall panel 20 is attached to a building by a so-called rocking construction method. By combining two or more design panels 10, it is possible to make a module substantially equal to one ALC outer wall panel 20.
The size of the ALC outer wall panel 20 is, for example, a rectangular plate shape with a thickness of 100 mm × width of 600 mm × length of 3 m, and the design panel 10 has a size of, for example, thickness 37 mm × width 600 mm × length 2 m and 1 m. The rectangular plate shape. In the present embodiment, the case where the long sides are arranged in the vertical direction will be described as an example, but the present invention is not limited to this.
Such a design panel 10 is overlaid with screws 2 on an existing ALC outer wall panel 20.

(4) The design panel 10 is stretched after partially applying an adhesive on the existing ALC outer wall panel 20.
Before attaching the design panel 10 on the existing ALC outer wall panel 20, it is preferable to apply an adhesive to the ALC outer wall to provide the adhesive layer 3. The adhesive layer 3 is provided on the surface of the ALC outer wall panel 20 at least in the vicinity of the place where it is screwed. When the screws are fixed, the design panel 10 can be prevented from dropping, and the workability and safety during work are improved.
The thickness of the adhesive layer 3 is not less than the uneven height of the surface of the ALC outer wall panel 20. The surface of the ALC outer wall panel 20 has unevenness (unevenness) due to the blowing of paint, etc. When the design panel 10 is screwed as it is (without forming an adhesive layer), the panel is bent by the unevenness. There is a risk of cracking.
Therefore, it is preferable to apply the adhesive to the surface of the ALC outer wall panel 20 and provide the adhesive layer 3 before attaching the design panel 10. The thickness of the adhesive layer 3 is preferably equal to or greater than the height of the unevenness (non-land) existing on the surface of the ALC outer wall panel 20. Thereby, the uneven | corrugated clearance gap can be filled (non-land absorption).

At this time, if the adhesive is applied to the entire surface of the ALC outer wall panel 20, the air permeability and moisture permeability of the ALC outer wall panel 20 are hindered, and the amount of the adhesive used increases, which is uneconomical. The agent is preferably applied partially.
Although partial application of the adhesive is not particularly limited, for example, as shown in FIG. 1, the adhesive layer 3 is preferably formed in three lines in the longitudinal direction of the ALC outer wall panel 20. For example, the adhesive layer 3 is provided in three linear shapes, one at the center in the width direction of the panel and one on each side at substantially equal intervals. The outer adhesive layer 3 is applied in accordance with the screw driving position in the panel width direction. Thus, by providing the adhesive layer 3 in the form of three lines in the longitudinal direction, the degree of freedom to the screw driving position in the longitudinal direction of the panel is increased.
The application position of the adhesive layer 3 is more preferably 120 to 150 mm from the long side of the ALC outer wall panel 20. Since the screw 2 enters inside the reinforcing bar position of the ALC outer wall panel 20, the reliability of the screw strength is increased.
Although it does not specifically limit as a kind of adhesive agent, The well-known adhesive agent used as an adhesive agent for ALC panels and an outer wall panel can be used.

In addition to the above-described (1) to (4), in the present invention, when the design panel 10 is pasted on the ALC outer wall panel 20, it is preferable to construct as follows.
(5) Screwing in the vicinity of the adhesive layer 3.
When the design panel 10 is screwed to the ALC outer wall panel 20, it is preferable to drive in the vicinity of the adhesive layer 3 previously applied on the ALC outer wall panel 20.
The adhesive layer 3 absorbs micro unevenness (unevenness) on the surface of the ALC outer wall panel 20, so that the panel can be screwed without being bent (without bending stress) due to the unevenness. The crack of the design panel 10 to be performed can be prevented. Further, by driving the screw 2 in the vicinity of the adhesive layer 3, it is possible to prevent the screw 2 from dropping off.

The position where the adhesive layer 3 is formed and the position where the screw 2 is driven are preferably 120 to 150 mm from the long side of the panel. For example, there is a possibility that the panel cracks when the screw 2 is driven into the endless part of the panel. However, by driving the screw 2 into the above position, the screw 2 is driven to avoid the endless part. It is possible to avoid cracking of the panel and to stably obtain the screw pullout strength. In addition, when the ALC outer wall panel 20 is attached to the chassis by the insertion muscle construction method which has been the mainstream in the past, there is a possibility that the attachment strength is impaired when the screws 2 are driven in the vicinity of the panel attachment portions at the four corners. By driving the screw 2 into the position, the screw 2 can be driven avoiding the panel mounting portion, and the mounting strength is not impaired.
In FIG. 1, an example of the driving position of the screw 2 is indicated by +. In this example, the case of 8-point hitting is shown, one at the top and bottom at the center in the panel width direction and three at both sides in the width direction, but the present invention is limited to this. It is not a thing.

(6) A screw 2 is hit on the design panel 10 without previously preparing a pilot hole for the screw 2 and / or dishing.
Conventionally, it has been avoided to screw the design panel 10 to the ALC outer wall panel 20 for reasons such as strength reduction due to overtightening of the screws 2. The overtightening of the screw 2 mostly occurs when the head of the screw 2 is seated. Therefore, if a recess (dish pan) for housing the head of the screw 2 is perforated by the head of the screw 2 itself and intruded, it tends to be overtightened.
However, in the present invention, the design panel 10 is softened so that the screw head can be easily penetrated. Therefore, it is possible to prevent overtightening of the screw 2 without carrying out the pilot hole processing and / or dishing processing for the screw 2. it can. This improves the workability.

(7) The design panel 10 is attached to the ALC outer wall panel 20 via the heat insulating plate 30.
As shown in FIG. 3, when attaching the design panel 10 to the ALC outer wall panel 20, it is preferable to arrange a heat insulating plate 30 between the ALC outer wall panel 20 and the design panel 10. Thereby, heat insulation improves.
The heat insulating plate 30 is not particularly limited as long as it is normally used as a heat insulating plate for a building outer wall, and a heat insulating plate made of plastic foam, an inorganic heat insulating plate, or the like can be used. More preferably, the heat insulating plate 30 has flame retardancy or nonflammability. Further, the heat insulating plate 30 also has an effect of absorbing unevenness (unevenness) existing on the surface of the ALC outer wall panel 20.
When such a heat insulating plate 30 is integrated with the design panel 10 in advance, workability and workability are improved, which is preferable.

(8) At least one place is used in combination with a penetrating or expanding anchor.
As shown in FIG. 4, it is preferable to fix the design panel 10 to the ALC outer wall panel 20 using a penetrating or expanding anchor in addition to the screw 2. FIG. 4 shows an example using the penetrating anchor 4. By using the penetration type or expansion type anchor, it is possible to reliably prevent the design panel 10 from falling off, and safety can be further improved.

(9) After at least a part of the design panel 10 is screwed, a penetration type or expansion type anchor is applied.
When using a penetration type or an expansion type anchor, it is more preferable to drive in a penetration type or an expansion type anchor after screwing at least one or more places of the design panel 10 to the ALC outer wall panel 20. Since the screw 2 fulfills the temporary fixing function of the design panel 10, operations such as drilling a pilot hole and inserting an anchor are facilitated, and workability is improved.

(10) As shown in FIG. 5, in the construction method in which the design panel 10 is overlaid with screws on the existing ALC outer wall panel 20, the compressive strength of the design panel 10 and / or the dimensions of the screws 2 are
(Pulling strength of the screw 2 in the existing ALC outer wall panel 20)> (Deeping strength of the head seating surface of the screw 2 in the design panel 10)
It is preferable to select the design panel 10 and / or the screw 2 so that the above relationship is established.
If the indentation strength of the head seat surface of the screw 2 in the design panel 10 is greater than the pull-out strength of the screw 2 in the existing ALC outer wall panel 20, the screw 2 will continue to be screwed in after the head of the screw 2 is seated. Two heads do not dig into the design panel 10, and as a result, the tip of the screw 2 is idle in the ALC panel. Then, the ALC panel around the screw 2 collapses, and the pull-out strength of the screw 2 decreases.
By selecting the design panel 10 and the screw 2 so that the pullout strength of the screw 2 in the ALC outer wall panel 20 and the indentation strength of the head seating surface of the screw 2 in the design panel 10 have the above relationship, Even after the head is seated on the surface of the design panel 10, screwing is not hindered, so that the screw 2 can be used effectively.
According to the method as described above, the design panel as the new outer wall can be screwed on the ALC outer wall panel simply and with high reliability, and the aesthetics of the building can be renewed.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the invention.

  By using the construction method according to the present invention, a design panel that becomes a new outer wall can be easily and reliably applied on an existing ALC outer wall panel, and is widely used as a construction method for exterior renovation. be able to.

1: Wall structure 2: Screw 3: Adhesive layer 4: Penetrating anchor 10: Design panel 20: ALC outer wall panel 30: Insulation plate

Claims (9)

A design panel for laying on an outer wall panel made of lightweight cellular concrete (ALC) cured by an autoclave,
Made of lightweight cellular concrete, with a given design applied to the surface,
A design panel, wherein the compressive strength is lower than the compressive strength of the outer wall panel. The design panel. Fixed on the outer wall panel by screws,
2. The design panel according to claim 1, wherein the indentation strength when the head seating surface of the screw is pressed against the design panel is smaller than the pull-out strength of the screw driven into the outer wall panel. .   3. The design panel according to claim 1, wherein the lightweight cellular concrete forming the design panel has a lower specific gravity than the ALC forming the outer wall panel.   A wall structure, wherein the design panel according to any one of claims 1 to 3 is screwed to an outer wall panel made of ALC.   The wall structure according to claim 4, further comprising a heat insulating layer provided between the outer wall panel and the design panel. In the surface of the outer wall panel, it has an adhesive layer provided in the vicinity of the place where the screw is driven,
The wall structure according to claim 4 or 5, wherein the height of the adhesive layer is equal to or higher than the uneven height of the surface of the outer wall panel.   7. The design panel according to claim 4, wherein the design panel is fixed to the outer wall panel in combination with at least one penetration type or expansion type anchor in addition to the screw. 8. Wall structure. In the construction method in which the design panel according to any one of claims 1 to 3 is overlaid on the outer wall panel by screwing,
Compressive strength of the design panel and / or dimensional shape of the screw,
Screw pull-out strength in the outer wall panel> The construction method is characterized in that selection is made so that the relationship of the indentation strength of the head seating surface of the screw in the design panel is established.   The construction method according to claim 8, wherein the screw is driven into the design panel without performing the pilot hole processing and / or dishing processing for the screw in advance.

Images