JP5171273B2 - Moisture-proof structure of concrete outer wall - Google Patents

Description

  The present invention relates to a moisture-proof structure for an outer wall in a concrete building.

  Conventionally, concrete structures such as reinforced concrete structures (RC structures), steel reinforced concrete structures (SRC structures), etc. (in this specification and claims, these are collectively referred to as “concrete structures”). There is a building. In these concrete buildings, the outer wall is insulated by the outer heat insulation method or the inner heat insulation method.

  The outer insulation method is to install heat insulation on the outside of the outer wall and tiles on its surface, so it is difficult to construct and requires a lot of time and labor, and is often used in cold regions. However, in general concrete buildings (for example, middle- and low-rise condominiums and buildings, etc.), an internal heat insulating method in which a heat insulating material is attached to the inside is relatively easy to construct.

  FIG. 4 is a cross-sectional view showing a general conventional heat insulation structure of a concrete outer wall. As shown in the figure, an inner heat insulating structure 51 of a general concrete outer wall 52 is such that the outer surface of the concrete outer wall 52 is finished by an external finishing material 53 such as tiles, and the inner surface is a heat insulating material 54 such as blowing urethane foam. And an adhesive 55 (GL bond) provided on the inner surface of the outer wall 52 at a predetermined interval is provided with a board 56 (gypsum board, a commercially available moisture-proof board, etc., simply referred to as “board”). Many internal heat insulation methods are used. A cloth 57 is stuck on the indoor surface of the board 56 to finish the indoor side.

  In the illustrated example, a board 56 is attached by a method called GL method (zipsum lining method), GL bonds 55 are provided on the inner surface of the concrete outer wall 52 at predetermined intervals, and the board 56 is crimped to the GL bond 55. Thus, a certain amount of space 58 (air layer) is provided between the outer wall 52 and the board 56.

  As this type of conventional technology, for example, there is one in which a moisture-proof sheet obtained by laminating a resin layer having a high melting point and a resin layer having a low melting point is thermocompression-bonded to a wooden board to have moisture resistance (for example, Patent Document 1).

As another conventional technique, there is a technique in which a thin resin film is formed on the surface of a gypsum board (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 11-227112 Japanese Patent Laid-Open No. 5-98771

  However, the above-described conventional inner heat insulation method is intended to reduce the heat transmissivity by the heat insulating material 54 and to reduce the heat transfer from the room to the outside, and the outer wall due to the movement of moisture (water vapor) from the indoor side. It is not a structure that actively prevents condensation on the inner surface.

  Therefore, even if a commercially available moisture-proof board is used for the board 56, it is effective when the air layer thickness in the wall is thick as in the case of wooden or steel frame, but in the case of the concrete outer wall 52, heat insulation is provided. The boundary portion 59 between the indoor side of the material 54 and the concrete outer wall 52 tends to become low temperature due to the influence of the outdoor temperature, and the saturated water vapor pressure is low and condensation occurs.

  Therefore, in the case of the concrete outer wall 52, even if condensation does not occur on the surface of the heat insulating material 54 which is the inner surface of the outer wall 52 with the board 56 removed, the heat insulating material 54 and the concrete outer wall are visible. In many cases, moisture (water vapor) moves to the boundary 59 with 52 and condensation occurs. This dew condensation may cause mold on the inner surface of the outer wall 52, which may adversely affect the indoor air environment. If this condensation is to be prevented only by the heat insulating material 54, for example, if the concrete outer wall 52 is 150 mm thick and the heat insulating material 54 is urethane foam, a thickness of about 94 cm is required for calculation, which is unrealistic. It becomes thickness.

  As described above, the structure in the conventional inner heat insulation method corresponds to the reduction of the heat transfer rate by reducing the heat transfer rate, but the movement of moisture (water vapor) to the inner surface of the concrete outer wall 52 is effective. It cannot be suppressed. The inventions described in Patent Documents 1 and 2 do not show a structure that can effectively inhibit the movement of moisture (water vapor) to the inner surface of the concrete outer wall.

  Therefore, the present invention provides a moisture-proof structure for a concrete outer wall that prevents moisture (water vapor) from moving from the indoor side to the inner surface of the concrete outer wall and prevents condensation on the inner surface of the concrete outer wall. Objective.

In order to achieve the above object, the present invention provides a moisture-proof structure for a concrete outer wall in a building having a concrete outer wall, and a board provided with a predetermined space with an adhesive on the indoor side of the outer wall. A moisture-proof film that is bent from the outer wall side of the board and is bent from the outer wall side in the plate thickness direction and stuck to the chamfered portion, and the moisture-proof film is bonded to a paper substrate and a film material. The paper substrate is adhered to the board so that the outer wall side of the board is covered with a film material, and a plurality of the boards are arranged side by side so that a moisture-proof film is in contact with each other. By connecting the joints from the interior side with a moisture-proof material and forming the inner surfaces of a plurality of boards in a continuous surface, condensation on the inner surface of the outer wall is prevented. The “moisture-proof film” in the specification and claims refers to a film having a function of preventing the passage of “moisture (water vapor)”. This prevents moisture (water vapor) on the indoor side from moving to the inner surface of the concrete outer wall by the moisture-proof film, and effectively suppresses the generation of dew condensation on the inner surface of the outer wall. it can.

Also, it is possible to exert a moisture-proof effect by anti-humidity fill was stuck so as to be continuous by bending in the thickness direction from the outer wall side of the board at the joint portion of the board, the inner surface of the concrete outer wall from the interior side It is possible to effectively prevent moisture from moving and effectively prevent mold from being generated on the inner surface of the concrete outer wall.

Furthermore, by sticking a paper substrate of moisture-proof film on the outer wall side of the board can be covered with the outer wall side of the board in the film material, it is possible to efficiently perform the work to have moisture resistance on the outer wall side of the board it can.

Further, it is possible to moisture from the joint portion of the plurality of boards juxtaposed is suppressed from moving to the inner surface of the concrete outer wall more effectively, further to prevent the occurrence of mold on the inner surface of the concrete outer wall.

  Furthermore, if a heat insulating material is provided on the indoor side of the outer wall, a predetermined space is provided with the heat insulating material, and the board is attached to the indoor side with an adhesive, it is often used in medium- and low-rise condominiums and buildings. In a structure in which a board is attached to the outer wall by the GL method and a heat insulating space is formed between the outer wall and the board, the indoor moisture is prevented from moving to the inner surface of the concrete outer wall, and the indoor side of the concrete outer wall It is possible to effectively prevent the generation of mold due to condensation.

  Since the present invention can suppress the movement of moisture (water vapor) from the indoor side to the inner surface of the concrete outer wall by means as described above, it prevents moisture condensation on the inner surface of the concrete outer wall and stabilizes the moisture resistance. Can be achieved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a part of a board used for the moisture-proof structure of a concrete outer wall according to the present invention, and FIG. 2 is an exploded perspective view of the board shown in FIG. FIG. 3 is a cross-sectional view showing a moisture-proof structure of a concrete outer wall according to an embodiment of the present invention. In the following embodiment, a gypsum board is used as a board, and a moisture-proof structure of an inner heat insulating method that is attached to the outer wall 12 by the GL method described above will be described as an example.

  As shown in FIGS. 1 and 2, the board 1 is cut into a predetermined size after forming a board body 3 by pouring gypsum slurry between board base papers 2 and curing the gypsum slurry. The surface except the thick plate surface 4 (cut surface) is covered with the base paper 2 for board.

  A moisture-proof film 5 is attached to the outer wall side of the board 1. The moisture-proof film 5 is configured by joining a paper base material 6 and a film material 7, and the paper base material 6 is adhered to the board base paper 2 of the board 1. As the film material 7, for example, a plastic film such as a polyethylene film or a polypropylene film, an aluminum foil film, or the like is used. A versatile plastic film such as a polyethylene film is preferable for economical efficiency and moisture movement inhibition.

  Moreover, in this embodiment, the moisture-proof film 5 is stuck so as to be bent from the outer wall side of the board 1 in the thickness direction and continuous. The moisture-proof film 5 is bent up to the corner chamfered portion 8 of the board 1. As described above, the moisture-proof film 5 is attached by forming the moisture-proof film 5 with the paper base material 6 and the film material 7 and attaching the paper base material 6 to the board base paper 2. Thereby, the moisture-proof film 5 can be stuck and stuck to the base paper 2 for boards. In FIGS. 1 and 2, the components are illustrated separately, but the board 1 is formed as a unit.

  As shown in FIG. 3, the board 1 is used for an inner heat insulating method on the indoor side of the concrete outer wall 12, and a heat insulating material 14 such as urethane foam and a predetermined space 18 (air layer) provided on the inner surface of the outer wall 12. In a state in which is opened, it is attached to the inner surface of the outer wall 12 by an adhesive 15 (GL bond) provided at a predetermined interval. A cloth 17 is pasted on the indoor surface of the board 1 to finish the indoor side. Thereby, it becomes the moisture-proof structure 11 by which the board 1 was arrange | positioned so that the moisture-proof film 5 may be located in the outer wall 12 side.

  Further, in this embodiment, a plurality of boards 1 are arranged side by side, and each board 1 is arranged so that a moisture-proof film 5 bent and stuck in the thickness direction from the outer wall side of the board 1 is in contact therewith. Yes. In this manner, the moisture-proof film 5 is in contact with the joint portion 20, thereby achieving moisture prevention at the joint portion 20. In addition, in this embodiment, the joint portion 20 of the board 1 is joined from the indoor side by the moisture-proof material 21, and the inner surfaces of the plurality of boards 1 are formed in a continuous smooth surface. As this moisture-proof material 21, putty or the like is used. As described above, since the corner chamfered portion 8 is provided at the end portion of the board 1, a stable moisture-proof effect can be obtained by filling the corner chamfered portion 8 with the moisture-proof material 21 from the indoor side. By joining the joint portion 20 with such a moisture-proof material 21, the moisture is also removed from the outer wall 12 at the joint portion as well as the moisture-proof effect of the moisture-proof film 5 that is bent and stuck in the thickness direction of the board 1 as described above. The movement to the inner surface 19 (the boundary with the heat insulating material 14) is suppressed to further improve the moisture-proof effect.

  As described above, according to the moisture-proof structure 11, moisture (water vapor) can be effectively prevented from moving from the indoor side to the outer wall 12 side by the moisture-proof film 5 provided on the board 1. For example, the water vapor pressure in the space 18 between the board 1 and the concrete outer wall 12 can be reduced to 45% to 50%, and the occurrence of condensation can be prevented by making it lower than the saturated water vapor pressure in the space 18. it can. Therefore, it becomes possible to provide the moisture-proof structure 11 of the concrete outer wall by suppressing the generation of mold due to the occurrence of condensation on the inner surface 19 of the outer wall 12 so that the indoor air environment is not deteriorated.

  In addition, in the said embodiment, although the internal heat insulation construction method using the gypsum board for the board 1 was demonstrated to the example, the same effect will be acquired if this invention is applied also to the same internal heat insulation construction method using another board. Can do.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The moisture-proof structure of the concrete outer wall according to the present invention can be used for a structure that is desired to prevent condensation on the inner surface of the concrete outer wall.

It is a cross-sectional view which shows a part of board used for the moisture-proof structure of the concrete outer wall of this invention. It is a disassembled perspective view of the board shown in FIG. It is a cross-sectional view which shows the moisture-proof structure of the concrete outer wall based on one embodiment of this invention. It is a cross-sectional view which shows the heat insulation structure of the conventional concrete outer wall.

Explanation of symbols

1 ... Board
2 ... Board base paper
4 ... Thick surface
5 ... Moisture-proof film
6 ... Paper substrate
7 ... Film material
DESCRIPTION OF SYMBOLS 8 ... Corner chamfer 11 ... Dampproof structure 12 ... Concrete outer wall 14 ... Heat insulating material 15 ... Adhesive material 18 ... Space 19 ... Inner surface 20 ... Joint part 21 ... Dampproof material

Claims (2)

A moisture-proof structure of a concrete outer wall in a building having a concrete outer wall,
Moisture-proof attached to a board that is provided with a predetermined space with an adhesive on the indoor side of the outer wall so that it is continuous from the outer wall side of the board and the outer wall side to the corner chamfered portion by bending in the thickness direction. Have a film ,
The moisture-proof film is constituted by joining a paper base material and a film material, and the paper base material is adhered to the board so that the outer wall side of the board is covered with the film material,
A plurality of the boards are arranged side by side so that the moisture-proof film is in contact,
A moisture-proof structure for a concrete outer wall characterized in that condensation on the inner surface of the outer wall is prevented by joining joints in the corner chamfered portion of the board from the indoor side with a moisture-proof material to form the inner surfaces of a plurality of boards in a continuous surface. . The moisture-proof structure of a concrete outer wall according to claim 1, wherein a heat insulating material is provided on the indoor side of the outer wall, a predetermined space is provided with the heat insulating material, and the board is attached to the indoor side with an adhesive.

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