JP7576211B2 - Wooden Buildings - Google Patents

Description

Application of Article 30, paragraph 2 of the Patent Act 1. Fact of disclosure 1 The date of the invention being implemented: November 22, 2019 to June 10, 2019, implemented by: Takumido LLC, implemented at: 1699-2 Kawamichi, Nagahama City, Shiga Prefecture 2. Fact of disclosure 2 The date of the invention being implemented: January 16, 2020 to June 22, 2020, implemented by: Takumido LLC, implemented at: 298-1 Ugano, Maibara City, Shiga Prefecture 3. Fact of disclosure 3 The date of the invention being implemented: February 7, 2020 to June 13, 2020, implemented by: Takumido LLC, implemented at: 1027-5 Miyajicho, Nagahama City, Shiga Prefecture 4. Fact of disclosure 4 The date of the invention being implemented: April 28, 2020 - ongoing, implemented by: Takumido LLC, implemented at: 757 Ugano, Maibara City, Shiga Prefecture

The present invention relates to wooden buildings.

In recent years, energy conservation measures for wooden buildings, including houses, have been considered. For example, the "Guidelines for Design, Construction, and Maintenance of Houses Concerning the Rationalization of Energy Use" (2006 edition) (Ministry of Land, Infrastructure, Transport and Tourism Notification No. 378 of 2006) (hereinafter referred to as the "2006 Guidelines"), which were released in 2006, provide guidelines for the design, construction, and maintenance of houses in accordance with the provisions of the Criteria for Building Owners and Owners of Specified Buildings Concerning the Rationalization of Energy Use in Houses (Ministry of Economy, Trade and Industry and Ministry of Land, Infrastructure, Transport and Tourism Notification No. 3 of 2006). The 2006 Guidelines provide standards for the construction of airtight layers, for example, standards for the construction of airtight sheets.

Airtight sheets are applied to wooden buildings, for example, to ensure the insulation of the house, to allow proper ventilation, and to ensure the durability of the structural frame. Patent Document 1 discloses a wooden building equipped with such an airtight sheet. In said Patent Document 1, an airtight moisture-proof sheet material is provided on each of the walls and ceiling of the wooden building.

JP 2001-59285 A

The 2006 Guidelines set out standards for installing such airtight sheets. For example, the 2006 Guidelines state that "sheet-like airtight materials should overlap by 30 mm or more where there is a base material, and this area should be sandwiched between materials such as plywood, dried wood, or gypsum board." However, installing moisture-proof sheets on wooden buildings while adhering to the above standards is difficult.

For example, when installing moisture-proof sheets on the ceiling and walls and overlapping these moisture-proof sheets, in order to meet the above criteria, the layout must be adjusted so that the moisture-proof sheets on the ceiling and the moisture-proof sheets on the walls overlap by 30 mm or more. However, wooden buildings such as houses usually have many cross members such as beams and columns, so it takes skilled hands to adjust the layout while taking into account the positions of such cross members and columns. For example, as shown in Figure 16, if there is a partition column in the indoor space, the moisture-proof sheet must be cut out to avoid the partition column. Since such layout adjustments require a lot of time, a large number of man-hours are required for the construction of wooden buildings, leading to increased construction costs. Therefore, a technology that can solve such problems has been desired.

As a result of extensive research, the inventors discovered that the above problems could be solved by giving wooden buildings a specific structure, and thus arrived at the present invention.
That is, the present invention provides:
[1] A wooden building including columns, beams and ceiling panels,
The ceiling plate is provided on the upper surface of the cross member,
There is a gap between the ceiling panel and the outermost horizontal member,
a resin sheet having airtightness covering an upper surface of the ceiling board and continuously covering the plurality of columns on their inner surfaces, the resin sheet covering the upper surface of the ceiling board and the resin sheet continuously covering the plurality of columns on their inner surfaces being continuous with each other via the gap;
[2] The wooden building according to [1], wherein the cross member is an additional cross member provided under the rafter.
[3] The wooden building according to [1] or [2], wherein the gap is 20 to 30 mm.
[4] A wooden building according to any one of [1] to [3], wherein a wall material is attached to the inner surface of the column via the resin sheet, and the gap is closed by the upper side of the wall material;
[5] The wooden building according to any one of [1] to [4], wherein the wall material is a plate material made of a material having a heat insulating effect.
[6] A wooden building according to any one of [1] to [5], in which a heat insulating material is provided on the ceiling board covered with the resin sheet, and [7] A wooden building having two or more stories including a cross member, a floor board and a plurality of columns,
The floor plate is provided on the upper surface of the cross member,
There is a gap between the floorboards of floors other than the first floor and the outermost horizontal members.
a wooden building having an airtight resin sheet continuously covering the plurality of columns on their inner surfaces, the resin sheet covering the plurality of columns on one floor on their inner surfaces and the resin sheet continuously covering the plurality of columns on another floor on their inner surfaces being continuous with each other through the gap;
Regarding.

In the wooden building of the present invention, the resin sheet applied to the ceiling is continuous with the resin sheet applied to the inner surface of the pillar. Also, in the wooden building of the present invention, the resin sheet covering the inner surface of the pillar on the first floor is continuous with the resin sheet covering the inner surface of the pillar on the other floor. Since there are no seams between these resin sheets, or if there are seams, they can be kept to a minimum, the wooden building of the present invention has very high airtightness. Also, when constructing a wooden building, the time required to adjust the layout of the resin sheets can be significantly reduced and construction can be completed in one go, which significantly reduces the amount of work required to construct a wooden building.

FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) A according to embodiment 1, which is one form of the present invention, in the state before the resin sheet is applied (cross-sectional view along the A-B direction in FIG. 14). FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) A according to embodiment 1, which is one form of the present invention, in the state before the resin sheet is applied (cross-sectional view along the CD direction in FIG. 14). FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) A according to embodiment 1, which is one form of the present invention, after a resin sheet has been applied (cross-sectional view along the A-B direction in FIG. 14). FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) A according to embodiment 1, which is one form of the present invention, after a resin sheet has been applied (cross-sectional view along the CD direction in FIG. 14). (a) is a drawing showing one method of cutting a resin sheet, and (b) is a drawing showing one method of avoiding a rafter Z by using the cut resin sheet. 1A and 1B are schematic diagrams showing a resin sheet covering the inner surface of a ceiling panel and a pillar through a gap, in which (a) a resin sheet has been repaired with tape and (b) a resin sheet has been pasted together in the middle. FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) B according to embodiment 2, which is one form of the present invention, in the state before the resin sheet is applied (cross-sectional view along the A-B direction in FIG. 14). FIG. 14 is a schematic cross-sectional view of a two-story wooden building (wooden house) B according to embodiment 2, which is one form of the present invention, showing the state before the resin sheet is applied (cross-sectional view along the CD direction in FIG. 14). FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) B according to embodiment 2, which is one form of the present invention, after a resin sheet has been applied (cross-sectional view along the A-B direction in FIG. 14). 1 is a diagram showing a schematic diagram of a wall material covering a resin sheet that covers the inner surface of a pillar. 1A is a diagram showing the case where insulation material is stacked horizontally on top of a ceiling board, and (b) is filled vertically in a row. This is a two-story wooden building (wooden house) C according to embodiment 5, which is one form of the present invention (cross-sectional view taken along the line AB in FIG. 14). FIG. 15 is a schematic cross-sectional view of a two-story wooden building (wooden house) C according to embodiment 5, which is one form of the present invention, in the state before the resin sheet is applied (cross-sectional view along the E-F direction in FIG. 14). This is a drawing showing the exterior of a typical wooden building (wooden house). FIG. 15 is a schematic cross-sectional view showing a conventional wooden building (wooden house) (cross-sectional view taken along line AB in FIG. 14). 1 is a photograph showing one embodiment of the installation of a moisture-proof sheet in a conventional wooden building (wooden house) having partition pillars.

The present invention will be described based on a specific embodiment with reference to the drawings. Note that the drawings and the following description are merely for explaining one embodiment of the present invention, and do not limit the scope of the present invention in any way. In addition, the terms "up and down," "front and back," and "left and right" in the text refer to the directions shown in each drawing.

Before describing the embodiments of the present invention, the structure of a conventional wooden building (wooden house) will be described based on a specific example. FIG. 14 is a drawing showing the appearance of a typical wooden building. FIG. 15 is a schematic drawing showing a conventional wooden building cut at the A-B cross section in FIG. 14. A conventional wooden house is provided with foundations 101, 101, and bases 102, 102 installed on the foundations 101, 101. A plurality of joists (not shown) are hung vertically between the bases 102, 102, and joists (not shown) are hung horizontally above the joists, and floorboards 102' are provided on the joists. A plurality of pillars 103, 103, ... are provided on the bases 102, 102. Between the upper ends of the columns 103, 103, ..., girths 104, 104 are suspended as horizontal members extending in parallel. A number of floor beams (not shown) are suspended vertically between the girths 104, 104, and a number of joists (not shown) are suspended horizontally above the floor beams, and a floorboard 104' is provided on the joists. Similarly, columns 103, 103, ... are erected on the girths 104, 104 in correspondence with the columns 103, 103, ... on the foundations 102, 102. Between the upper ends of the columns 103, 103, ... on the girths 104, 104, roof beams 105, 105 are suspended as horizontal members extending in parallel.

A roof 107 is hung via a truss (not shown) on top of the rafters 105, 105. A ceiling board 106 is attached to the underside of a cross member such as a rafter (not shown) that is connected to a hanging beam (not shown) that extends vertically downward from the rafters (not shown) that are connected to the rafters 105, 105.
The wooden building comprises the ceiling board 106, a floor on the first floor which is the lowest level, and exterior walls formed with openings such as windows, entrances, and ventilation openings, and rooms R, R... are provided in the space formed by these.

1. Embodiment 1
The wooden building of the present invention is a wooden building including columns, cross members and ceiling panels,
The ceiling plate is provided on the upper surface of the cross member,
There is a gap between the ceiling panel and the outermost horizontal member,
The wooden building has an airtight resin sheet (hereinafter, simply referred to as "resin sheet") that covers the upper surface of the ceiling board and continuously covers the multiple columns on their inner surfaces, and the resin sheet that covers the upper surface of the ceiling board and the resin sheet that continuously covers the multiple columns on their inner surfaces are continuous with each other through the gap. Note that the wooden building in this invention means a building whose main frame is made of wood. An example of such a building is a wooden house.

Figure 1 is a schematic cross-sectional view of a two-story wooden building (wooden house) A according to embodiment 1, showing the state before the resin sheet is applied (cross-sectional view in the A-B direction in Figure 14). It goes without saying that the wooden building in the present invention is not limited to a two-story building, but may be a one-story building (for example, a so-called single-story building) or a building with three or more floors. The wooden building A has foundations 1, 1 and bases 2, 2 installed on the foundations 1, 1. A plurality of joists (not shown) are hung vertically between the bases 2, 2, and a plurality of joists (not shown) are hung horizontally above the joists, and a floorboard 21 is provided on the joists. A plurality of columns 3, 3, ... are provided on the bases 2, 2. Girths 4, 4 are hung on the upper ends of the columns 3, 3, ... as cross members extending in parallel. A plurality of floor beams (not shown) are suspended vertically between the girths 4, 4, and a plurality of horizontal members 42, 42, ... are suspended horizontally between the girths 4, 4, and a floor board 41 is provided on the horizontal members 42, 42, .... Similarly, columns 3, 3, ... are erected on the girths 4, 4 in correspondence with the columns 3, 3, ... on the foundations 2, 2. A rafter X5, 5 is suspended as a horizontal member extending in parallel to the upper ends of the columns 3, 3, ... on the girths 4, 4. A roof 7 is placed on the rafter X5, 5 via a rafter (not shown). The wooden building A is provided with a ceiling board 6 described later, the floor of the first floor, which is the lowest floor, and an exterior wall with openings such as windows, entrances, and ventilation openings, and rooms R, R, ... are provided in the space formed by these.

Figure 2 is a cross-sectional view of the wooden building A of embodiment 1 in the C-D direction in Figure 14, before the resin sheet 10 is applied. The roof beams X5, 5 are connected to the roof beams Y8, 8 as cross members. A number of roof beams Z9, 9, ... are suspended between the roof beams Y8, 8 in a direction parallel to the roof beams X5, 5. A ceiling board 6 is provided on the upper surface of the roof beams Z9, 9, .... A gap G is provided between the ceiling board 6 and the roof beams X5, 5 and roof beams Y8, 8, which are the outermost cross members. Here, the "outermost cross member" in this invention means the cross member located at the outermost position when the wooden building is viewed from the planar direction, such as the roof beam X5 and roof beam Y8 in Figure 2. The width L1 of the gap G is not particularly limited, provided that it is wide enough to pass the resin sheet 10 described later. A specific example of the width is, for example, 20 to 30 mm, preferably 20 to 25 mm. By setting the width of the gap G within the above range, when the resin sheet 10 is applied as described later, the resin sheet 10 can be easily pushed through the gap by a finger, and the gap G can be more easily blocked by the upper end surface of the wall material attached to the inner surface of the pillar described later. The width of the gap G may be the same width in the front, back, left and right, or may be different widths. The material of the ceiling board 6 may be any material that has been used for ceiling boards in the past. The thickness of the ceiling board 6 is not particularly limited. For example, by setting the thickness of the ceiling board 6 to a thickness of 20 to 35 mm, a worker can stand on the ceiling board 6 to apply the resin sheet 10, thereby further improving work efficiency. In addition, as described in the fourth embodiment described later, when an insulating material is applied on the ceiling board 6, by setting the thickness of the ceiling board to the above numerical value, the ceiling board can withstand the mass of the insulating material applied on the ceiling board 6, so that more insulating material can be applied.

Figure 3 is a schematic cross-sectional view of a two-story wooden building (wooden house) A according to embodiment 1 after the resin sheet 10 has been applied (cross-sectional view A-B in Figure 14). The resin sheet 10 can be used by changing the area as appropriate depending on the overall size of the wooden building A. In addition, the material and thickness of the resin sheet 10 are not particularly limited, provided that it has airtightness that can block moisture. For example, a polyethylene film with a thickness of about 0.05 to 0.2 mm, an aluminum-deposited polyethylene film, or a film made of aluminum foil backed with craft paper can be used as the resin sheet 10. In addition, in Figure 3, the resin sheet 10 covers only the inner surfaces of the columns 3, 3, ... on the second floor, but by providing a gap between the floor board 41 and the outermost horizontal member as described later, the resin sheet 10 may be continuously covered not only on the second floor but also on the inner surfaces of the columns 3, 3, ... on the first floor.

The resin sheet 10 covers the upper surface of the ceiling board 6 and continuously covers the inner surfaces of the columns 3, 3, ..., and the resin sheet 10 covering the ceiling board 6 and the resin sheet 10 covering the columns 3, 3, ... are continuous through the gap G. Note that "the inner surface of the column" means, for example, the surface facing the inside of the room in the case of a rectangular column. Also, "continuously covering the multiple columns with its inner surface" means that the inner surfaces of the multiple columns 3, 3, ... are continuously covered without gaps (even if there are gaps, they are stuck together) (i.e., the resin sheet 10 is stretched between one column 3 and another column 3 located next to it). The resin sheet 10 may be a single large resin sheet. Also, if it is difficult to cover the entire inner surfaces of the ceiling board 6 and the columns 3, 3, ... with just one resin sheet, a resin sheet 10 made by sticking together multiple resin sheets may be used. In the wooden building A of the present invention, multiple resin sheets can be bonded together to form the resin sheet 10 before the resin sheet 10 is applied to the wooden building A, which greatly reduces the effort required to adjust the bonding position while adjusting the layout at the construction site.

Figure 4 is a schematic diagram showing the state of a two-story wooden building (wooden house) A according to embodiment 1 after the resin sheet 10 has been applied (cross-sectional view C-D in Figure 14). The resin sheet 10 covers the entire upper surface of the ceiling board 6 and continues to the inner surfaces of the columns 3, 3, ... through the gap G. In some places, the gap G is blocked by the rafters Z9, 9, ... that support the ceiling board 6. In such places, as shown in Figure 5 (a), a cut C is made in a part of the resin sheet 10, and a triangular cut is made, for example, in the part of the resin sheet 10 that contacts the rafter Z9, so that the resin sheet 10 can continuously cover the upper surface of the ceiling board 6 and the inner surfaces of the columns 3, 3, ... while avoiding the rafters Z9, as shown in Figure 5 (b). The resin sheet 10 does not necessarily need to be fixed to the ceiling board 6, but when it is fixed, it can be fixed by any method that has been used to fix a resin sheet to a ceiling. For example, it may be fixed by a tacker.

Figure 6 is a drawing explaining the state in which the resin sheet 10 is attached to the inner surface of the columns 3, 3, ... through the gap G from the ceiling board 6. The resin sheet 10 covering the upper surface of the ceiling board 6 passes through the gap G as described above and is attached to the inner surface of the columns 3, 3, .... Here, as described above, the parts where the cuts are made to avoid the rafters Z9, 9, ... may be attached with tape 11 or the like as shown in Figure 6 (a). When fixing the resin sheet 10 to the columns 3, 3, ..., it can be fixed by any method that has been used to fix a resin sheet to a column. For example, it may be fixed by a tacker. In addition, if there is an opening such as a window on the wall, the resin sheet 10 may be cut out to match the shape of the opening. In the wooden building A of the present invention, the resin sheet 10 continuously covers the inner surfaces of the columns 3, 3, .... Therefore, during construction, the resin sheet 10 can be installed without worrying about the layout of the columns, so that the labor hours can be significantly reduced. In addition, as shown in FIG. 6(b), if the vertical width of the roof beam Y8 is greater than the vertical width of the roof beam Z9, the resin sheet 10 with cuts can be cut midway (for example, in the length direction (horizontal direction) of the roof beam Y8 at the location of the roof beam Y8) to avoid the roof beams Z9, 9, ..., and an uncut resin sheet 10 can be attached to the cut-out area. In this way, the effort of repairing the cuts in the resin sheet 10 can be eliminated.

The wooden building A of the present invention can cover the entire inside of the building continuously with the resin sheet 10. Therefore, the inside of the wooden building A of the present invention is very airtight, and temperature control by the air conditioning equipment is very efficient.

After the resin sheet 10 has been applied, decorative material or the like may be applied to the underside of the roof beams Z9, 9, ... to cover them so that they cannot be seen from inside the room.

2. Embodiment 2
In addition, as another embodiment of the wooden building of the present invention, the cross member may be an additional cross member provided under the roof beam. Fig. 7 is a schematic cross-sectional view of a two-story wooden building (wooden house) B according to this embodiment, showing the state before the resin sheet 10 is applied (A-B cross-sectional view in Fig. 14). The wooden building B has foundations 1, 1 and bases 2, 2 installed on the foundations 1, 1. A plurality of joists (not shown) are hung vertically between the bases 2, 2, and a plurality of joists (not shown) are hung horizontally above the joists, and a floorboard 21 is provided on the joists. A plurality of columns 3, 3, ... are provided on the bases 2, 2. Girths 4, 4 are hung on the upper ends of the columns 3, 3, ... as cross members extending in parallel. A plurality of floor beams (not shown) are suspended vertically between the girths 4, 4, and a plurality of cross members 42, 42, ... are suspended horizontally between the floor beams and the girths 4, 4, and a floor plate 41 is provided on the cross members 42, 42, .... Similarly, columns 3, 3, ... are erected on the girths 4, 4 in correspondence with the columns 3, 3, ... on the foundations 2, 2.

Additional girders 12, 12 are suspended as cross members extending in parallel to the upper ends of the columns 3, 3, ... on the girths 4, 4. The columns 3, 3, ... are erected on the additional girders 12, 12 in correspondence with the columns 3, 3, ... on the girths 4, 4. The roof beams X5, 5 are suspended as cross members extending in parallel to the upper ends of the columns 3, 3, .... The roof 7 is hung on the roof beams X5, 5 via a roof truss (not shown). The wooden building B differs from the wooden building A in FIG. 1 in that an additional cross member is provided between the girths 4, 4 and the roof beams X5, 5 (in other words, below the roof beams X5, 5).
The wooden building B comprises a ceiling panel 6 described below, a floor on the first floor which is the lowest level, and exterior walls having openings such as windows, entrances, and ventilation openings, and rooms R, R... are provided in the space formed by these.

Figure 8 is a cross-sectional view of the wooden building B of embodiment 2 cut in the direction C-D in Figure 14 before the resin sheet 10 is applied. Additional girders 13, 13 are connected to the additional girders 12, 12 as cross members. A number of additional small girders 14, 14, ... are hung between the additional girders 13, 13. A ceiling board 6 is provided on the upper surface of the additional small girders 14, 14, .... A gap G is provided between the ceiling board 6 and the additional girders 12, 12 and additional girders 13, 13, which are the outermost cross members. Here, the "outermost cross member" in this invention means the cross member located at the outermost position when the wooden building is viewed from the planar direction, such as the additional girders 12 and the additional girders 13 in Figure 8. The width L1 of the gap G is the same as in embodiment 1.

In the wooden building B of embodiment 3, the resin sheet 10 continuously covers the upper side of the ceiling board 6 and the inner surfaces of the columns 3, 3, ... through the gap G. Figure 9 is a schematic cross-sectional view of a two-story wooden building (wooden house) B according to embodiment 2 after the resin sheet 10 has been installed (cross-sectional view A-B in Figure 14). The types of resin sheet 10 that can be used, the method in which the resin sheet 10 covers the inner surfaces of the ceiling board 6 and the columns 3, 3, ..., and the fixing method are the same as those in embodiment 1.

In the wooden building B of the second embodiment, a relatively large space S can be secured above the ceiling board 6. Therefore, such a space S can be used as a storage space, etc., or as a space for filling with insulation material, as described below.

3. Embodiment 3
Furthermore, in the wooden building of the present invention, a wall material 15 may be attached to the inner surface of the columns 3, 3, ... via the resin sheet 10, and the gap G may be blocked by the upper side of the wall material 15. If the gap G is left open, when the temperature of the room is raised or lowered by the air conditioning equipment, heat may escape or be supplied through the gap G, which may reduce the efficiency of air conditioning. As described above, such a risk can be reduced by blocking the gap G using the wall material 15. Figure 10 is a drawing explaining an embodiment in which the gap G is blocked by the upper end surface of the wall material 15. The gap G between the ceiling board 6 and the outermost horizontal member (the rafter X5 in Figure 10) is blocked by the upper end surface of the wall material 15 attached to the surface of the columns 3, 3, .... In Figure 10, the width L2 of the wall material 15 is larger than the width L1 of the gap G, and the gap G is blocked by the upper end surface of the wall material 15. However, for example, the thickness L2 of the wall material 15 and the width L1 of the gap G may be made substantially the same, and the upper side of the wall material 15 may be inserted into the gap G to close it.

The wall material 15 can be any building material that has been used in the interior of wooden buildings. The wall material 15 can also be a plate made of a material with a heat insulating effect. The method of fixing the wall material 15 to the columns 3, 3, ... can be any conventional fixing method without any particular restrictions. If no treatment is applied to the columns 3, 3, ..., the cold air from the outside may reach the inside of the wooden building through the columns when the outside temperature is low, and the hot air from the outside may reach the inside of the wooden building through the columns when the outside temperature is high. On the other hand, by using a plate made of a material with a heat insulating effect as the wall material 15, the surface of the columns 3, 3, ... is covered with the heat insulating material, so that it is possible to make it difficult for such cold air or hot air from the outside to reach the inside of the wooden building through the columns 3, 3, .... An example of such a wall material with a heat insulating effect is extruded polystyrene foam.

4. Embodiment 4
In addition, in the wooden buildings A and B of the present invention, a heat insulating material 16 may be provided on the ceiling board 6 covered with the resin sheet 10. By providing the heat insulating material 16 on the ceiling board 6 in this way, the temperature control by the air conditioning equipment inside the wooden building can be more efficiently promoted. In particular, the wooden building B of the present invention can have a relatively large space (space S in FIG. 7) on the ceiling board 6 by providing the additional girders 12 and the additional girders 13. In addition, the ceiling board 6 has no cross members on its upper surface, and even if there are columns, there are only a few columns of the rafters, and it has an extremely flat surface. Therefore, as shown in FIG. 11(a), the plate-shaped heat insulating material 16 can be piled up in a high volume in multiple planar directions, and as shown in FIG. 11(b), multiple upright plate-shaped heat insulating materials 16 can be arranged without gaps. In the wooden building of the present invention, the ceiling board 6 is attached to the upper side of the cross member. In other words, since the upper side of the ceiling board 6 is in a flat state without any obstacles, the heat insulating material 16 can be arranged without gaps. As shown in FIG. 11(b), by arranging the upright plate-shaped insulation material 16 without any gaps, the thickness of the insulation layer above the ceiling board 6 can be made as thick as possible, thereby further improving the air conditioning efficiency inside the wooden building.

5. Embodiment 5
As a further embodiment of the present invention, there is provided a two or more story wooden building including a cross member, a floor plate, and a plurality of columns,
The floor plate is provided on the upper surface of the cross member,
There is a gap between the floorboards of floors other than the first floor and the outermost horizontal members.
An example of a wooden building is one having an airtight resin sheet that continuously covers the multiple columns on their inner surfaces, and the resin sheet covering the multiple columns on one floor on their inner surfaces and the resin sheet covering the multiple columns on another floor on their inner surfaces are continuous via the gap.
The wooden building of the fifth embodiment will be described below with reference to the drawings.

Figure 12 is a schematic cross-sectional view of a two-story wooden building (wooden house) C according to embodiment 5, showing the state before the resin sheet is applied (cross-sectional view along the A-B direction in Figure 14). It goes without saying that the wooden building in embodiment 5 is not limited to two stories. The wooden building C in Figure 12 is similar to the wooden building A in Figure 1, except that there is no gap between the ceiling board 6 and the rafters X5 and Y8, and there is a gap G between the floor board 41 and the girder 4, 4 and the floor beams 17, 17 described later, and the resin sheet 10 continuously covers the inner surfaces of the columns 3, 3, ... on the second floor and the inner surfaces of the columns 3, 3, ... on the first floor through the gap.

Figure 13 is a schematic diagram of a two-story wooden building (wooden house) C according to embodiment 5, showing the state before the resin sheet 10 is applied (sectional view E-F in Figure 14). A gap G is provided between the floor board 41 and the girths 4, 4 and floor beams 17, 17, which are the outermost horizontal members. The resin sheet 10 covering the inner surface of the second floor column and the resin sheet 10 covering the inner surface of the first floor column are continuous through the gap G. The type of resin sheet 10 that can be used, the method of covering the inner surfaces of the columns 3, 3, ..., and the fixing method are the same as in embodiment 1. Also, the gap G in the floor board 41 may be blocked by the upper surface of the wall material 15, as in embodiment 3. Of course, it goes without saying that the gap in the floor board 41 may be blocked by the lower surface of the wall material 15. Furthermore, as mentioned above, embodiment 1 and embodiment 5 may be combined to continuously cover the area from the top surface of the ceiling board 6 to the inner surfaces of the columns 3, 3, ... on the first floor.

The wooden building of the present invention has high airtightness and excellent heat retention. Therefore, it is possible to provide a wooden building that is extremely energy efficient when controlling the internal temperature.

1: Foundation, 2: Base, 21: 1st floor floor board, 3: Pillar, 4: Girth, 41: 2nd floor floor board, 42: Cross member, 5: X-beam, 6: Ceiling board, 7: Roof, 8: Y-beam, 9: Z-beam, 10: Plastic sheet, 11: Tape, 12: Additional girder, 13: Additional main girder, 14: Additional small beam, 15: Wall material, 16: Insulation material, 17: Floor beam

Claims (5)

A wooden building including a cross member, a ceiling board, and a plurality of columns,
The ceiling plate is provided on the upper surface of the cross member,
There is a gap of 20 to 30 mm between the ceiling panel and the outermost horizontal member,
A wooden building has an airtight resin sheet that covers the upper surface of the ceiling board and continuously covers the multiple columns on their inner surfaces, and the resin sheet covering the upper surface of the ceiling board and the resin sheet continuously covering the multiple columns on their inner surfaces are continuous via the gap. The wooden building according to claim 1, wherein the cross member is an additional cross member provided below the rafter. 3. The wooden building according to claim 1 or 2 , wherein a wall material is attached to the inner surface of the pillar via the resin sheet, and the gap is closed by an upper side of the wall material. 4. The wooden building according to claim 3 , wherein the wall material is a board made of a material having a heat insulating effect. The wooden building according to any one of claims 1 to 4 , wherein a heat insulating material is provided on the ceiling board covered with the resin sheet.

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