JP2026007733A - wooden house - Google Patents

Abstract

To provide a wooden house that does not require a bearing wall on the perimeter to separate the indoor and outdoor areas.
[Solution] The building comprises a first core 20 in which CLT panels 21 are connected in a cylindrical shape, a floor member 30 supported by the first core 20 and having a plurality of CLT panels 32 joined so as to be able to support horizontal load-bearing force, and a second core 40 supported by the floor member 30 and having CLT panels 41 connected in a cylindrical shape. The first core 20 and the second core 40 at least partially overlap on projection planes 39A and 39B, and an indoor space 80 is formed below the floor member 30.
[Selected Figure] Figure 1

Description

The present invention relates to a multi-story wooden house constructed using CLT panels.

Patent Document 1 discloses a house in which a semi-outdoor space with an exterior floor and eaves ceiling is provided on the outdoor side of the living room, and the living room space and the semi-indoor space are connected via a window.

Japanese Patent Application Laid-Open No. 2017-198024

In frame construction and wooden frame construction, the outer walls that separate the indoors and outdoors are load-bearing walls. In such wooden houses, in order to ensure the necessary strength from the outer load-bearing walls, indoor areas where openings can be reduced and walls can be increased, such as the bathroom, washroom, kitchen, storeroom, and staircase, are placed on the side opposite the sun, while indoor areas where more openings are desired, such as the living room, are placed on the side facing the sun. These restrictions on the layout of indoor areas limit the room plans available in wooden houses.

On the other hand, in steel-frame and reinforced concrete construction, rigid frame construction, which does not require load-bearing walls on the perimeter, is widespread. However, in wooden construction, it is difficult to achieve the necessary strength, rigidity, and durability, for example, at the joints between columns and beams.

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to provide a wooden house in which the outer walls that separate the indoor and outdoor areas do not need to be load-bearing walls.

(1) The wooden house according to claim 1 of the present invention comprises a first core in which CLT panels are connected in a cylindrical shape, floor members supported by the first core and to which a plurality of CLT panels are joined so as to be able to support horizontal strength, and a second core supported by the floor members and to which CLT panels are connected in a cylindrical shape. The first core and the second core at least partially overlap on a projection plane, and an interior space is formed below the floor members.

Because the first core supports the vertical load of the floor members, no bearing walls or pillars are required around the perimeter of the floor members. This allows for a wooden house with a high degree of freedom in the layout of the outer walls.

(2) Claim 2 is a wooden house according to claim 1, in which the first core and the second core have the same cylindrical shape and overlap on the projection plane.

There is no imbalance in the vertical load bearing capacity of the first and second cores.

(3) Claim 3 is a wooden house according to Claim 1 or 2, in which at least one of the first core and the second core has an opening in the CLT panel.

The internal space of the first core or second core can be accessed through the opening.

(4) Claim 4 is a wooden house according to any one of claims 1 to 3, in which the internal space of the first core and the internal space of the second core are continuous.

By placing an elevator or other lifting means in the internal space of the first and second cores, it can be used as space for people to move up and down the floor members.

(5) Claim 5 is a wooden house according to claim 4, in which stairs are provided in the internal space of the first core and the internal space of the second core.

According to the present invention, in wooden houses, the outer walls that separate the interior and exterior areas do not need to be load-bearing walls.

FIG. 1 is a perspective view of a wooden house 10 according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3A is a perspective view of a first core 20 according to the embodiment, and FIG. 3B is a perspective view of a second core 40 according to the embodiment. FIG. 4A is a perspective view of the floor member 30 according to the embodiment, and FIG. 4B is a perspective view of the rear surface of the floor member 30 according to the embodiment. Figure 5(A) is an exploded perspective view of the floor member 30 according to the embodiment, Figure 5(B) is an exploded perspective view of the back side of the floor member 30 according to the embodiment, and Figure 5(C) is a cross-sectional view of the joint between the CLT panel 33 and the CLT panel 34 according to the embodiment. Figure 6(A) is a projection view showing a projection surface 39A of the first core 20 and floor member 30 according to the embodiment, and Figure 6(B) is a projection view showing a projection surface 39B of the second core 40 and floor member 30 according to the embodiment.

Embodiments of the present invention will be described below. Note that the embodiments described below are merely examples of the present invention, and it goes without saying that the embodiments of the present invention can be modified as appropriate without departing from the spirit of the present invention. In the following description, the up-down direction 7 is defined based on the state in which the wooden house 10 is installed and ready for use (the state shown in Figure 1), the surface on which the opening 42 of the second core 40 is provided is referred to as the front, the front-to-rear direction 8 is defined as a direction perpendicular to the up-down direction 7, the surface on which the opening 43 of the second core 40 is provided is referred to as the left side, and the left-to-right direction 9 is defined as a direction perpendicular to both the up-down direction 7 and the front-to-rear direction 8.

A wooden house 10 according to this embodiment is shown in Figures 1 and 2. The wooden house 10 is a relatively low-rise building, e.g., two or three stories, constructed on a foundation 11 laid on the ground. The foundation 11 may be of any known construction, such as a reinforced concrete strip footing. The wooden house 10 primarily comprises a first core 20, second-floor floor members 30, a second core 40, first-floor exterior walls 50, first-floor floor members 60, second-floor exterior walls 70, and a roof (not shown). Note that Figure 1 omits the ceiling members 81, the roof, and the layout of the interior space 90. Figure 2 omits the roof and the layout of the interior spaces 80 and 90. Furthermore, while a wooden house may be three or more stories high, the main structure of a three-story or higher house is generally similar to that of a two-story house, and therefore, the structure up to the second floor will be described in this embodiment.

[First core 20]
2 , the first core 20 extends in the up-down direction 7 on, for example, the first floor of the wooden house 10, and supports vertical and horizontal loads transmitted from the floor members 30. The first core 20 is provided on, for example, the foundation 11.

As shown in Figure 3(A), the first core 20 is made up of four CLT panels 21 connected in a cylindrical shape with a rectangular cross section, and the cylindrical internal space 24 is divided into two internal spaces 25 and 26 in the front-to-rear direction 8 by an inner wall 27. The number of CLT panels 21 may be changed as appropriate depending on the shape of the first core 20. The first core 20 has openings at the top and bottom. CLT is an abbreviation for Cross Laminated Timber, and this applies hereinafter. Each CLT panel is a rectangular flat plate, excluding any openings or joints.

Each CLT panel 21 is used as a bearing wall. Each CLT panel 21 has the same shape, with the same thickness, width, and length in the vertical direction 7, although not all CLT panels 21 necessarily have the same shape. A CLT panel 21 is arranged on each of the four outer surfaces of the cylindrical first core 20. Of course, two or more CLT panels 21 may be arranged on each surface of the first core 20, each joined with known joining materials. Each CLT panel 21 that makes up the first core 20 is joined and fixed to the foundation 11 with joining materials such as anchor bolts. CLT panels 21 arranged in the intersecting direction are joined together with joining materials such as screws or drift pins.

As shown in FIG. 3(A), the first core 20 has openings 22 and 23. The openings 22 and 23 are formed in some of the multiple CLT panels 21 that make up the first core 20. Among the CLT panels 21, the CLT panel 21 with the opening 22 is referred to as CLT panel 21A, the CLT panel 21 with the opening 23 is referred to as CLT panel 21B, and the CLT panel 21 without an opening is referred to as CLT panel 21C. The main surface of the CLT panel 21A extends along the up-down direction 7 and the left-right direction 9 on the front surface of the first core 20. Note that the main surfaces refer to the two largest surfaces of the CLT panel 21.

The opening 22 is an entrance to the internal space 25 of the first core 20. The opening 22 connects the internal space 25 of the first core 20 to the outside in the front-to-rear direction 8. The opening 22 is located to the right of the CLT panel 21A and is open only downward. The length of the opening 22 in the left-to-right direction 9 is less than half the length of the CLT panel 21A in the left-to-right direction 9.

The main surface of the CLT panel 21B extends in the up-down direction 7 and the front-to-back direction 8 on the left side of the first core 20. The opening 23 connects the internal space 26 of the first core 20 to the outside in the left-to-right direction 9. The opening 23 is an entrance to the internal space 26 of the first core 20. The opening 23 is located at the rear of the CLT panel 21B and is open only downward, but is not limited to this. The length dimension of the opening 23 in the front-to-back direction 8 is less than half the length dimension of the CLT panel 21B in the front-to-back direction 8.

As shown in Figure 3(A), a staircase 28 is provided in the interior space 25. Also, although not shown in the figure, an elevator 29 is provided in the interior space 26. Note that the interior wall 27 may or may not be made of CLT panels.

[Floor member 30]
As shown in Figures 1 and 2, the floor member 30 extends in the front-to-back direction 8 and the left-to-right direction 9 on the second floor of a wooden house 10, for example, and supports vertical loads from people, furniture, etc., and transmits horizontal loads to the first core. In this embodiment, the floor member 30 is rectangular in plan view, but it does not necessarily have to be formed in a rectangular shape. Note that Figures 1 and 2 omit illustration of the structure in which multiple CLT panels 32 are joined in the floor member 30, and the floor member 30 is shown as a single flat plate.

As shown in Figure 2, the floor member 30 has an opening 31 at its center in the front-to-rear direction 8 and the left-to-right direction 9. The shape and size of the opening 31 are the same as those of the inner surface of the first core 20 when viewed from above. Therefore, the floor member 30 is supported by the first core 20 when placed on the first core 20 so that the inner surface of the first core 20 matches the edge of the opening 31. In other words, the vertical load applied to the floor member 30 is transmitted from the floor member 30 to the first core 20.

The floor member 30 and the first core 20 are joined by joining members such as bolts. The floor member 30 is supported by the first core 20.

As shown in Figures 4(A) and 4(B), the floor member 30 is formed by joining, for example, eight CLT panels 32. The number of CLT panels 32 may be changed as appropriate depending on the dimensions and shape of the floor member 30. The CLT panels 32 include four CLT panels 33 that form the periphery of the opening 31 and contact the CLT panels 21 of the first core 20, and four CLT panels 34 that are arranged at the four corners of the floor member 30.

Each CLT panel 33 is positioned around the periphery of the opening 31, with its back surface joined to the top surface of the CLT panel 21. As shown in Figures 5(A), 5(B), and 5(C), the CLT panel 33 has a buckled portion 37 at its end. The buckled portion 37 is formed by a protrusion 37A and a recess 37B. A recess 37C is formed on the back side of the buckled portion 37. A joining plate 35 is fitted into the recess 37C.

The CLT panel 34 is joined to the CLT panel 33. One corner of the CLT panel 34 is cut out to match the shape of the opening 31. The CLT panel 34 has a mating portion 38 at its end. The mating portion 38 is formed by a protrusion 38A and a recess 38B. A recess 38C is also formed on the back side of the mating portion 38. The recess 38C, together with the recess 37C, defines a space into which the joining plate 35 is fitted.

The joining plate 35 is fitted into the space defined by the recesses 37C and 38C to join the CLT panels 33 and 34. The joining plate 35 is a rectangular flat plate. One corner of the joining plate 35 is an abutment portion 35A that is notched at an angle. The abutment portion 35A abuts against the abutment portion 35A of another adjacent joining plate 35.

The convex portion 38A of the CLT panel 34 and the convex portion 37A of the CLT panel 33 overlap vertically and fit into the concave portions 37B and 38B, so that the CLT panels 33 and 34 fit together in a clasp-like manner. The concave portions 37C and 38C define a single continuous space, and the joining plate 35 is housed in this single space.

The multiple wood screws 36 are screwed from bottom to top into the joining plate 35 fitted into the recesses 37C and 38C. Some of the multiple wood screws 36 pass through the joining plate 35 and the protrusion 37A and are screwed into the protrusion 38A. The other wood screws 36 pass through the joining plate 35 and are screwed into the CLT panel 33 or CLT panel 34.

The floor member 30 is constructed by joining the CLT panels 33 and 34 in this way. The interconnected CLT panels 33 and 34 transmit vertical loads to each other. The vertical load applied to the floor member 30 is then transmitted to the first core 20. Note that the joining structure between the CLT panels 33 and 34 is an example, and other known joining structures may also be used.

[Second core 40]
As shown in Fig. 1, the second core 40 supports the vertical load of a ceiling member 81 (see Fig. 2) or a roof (not shown), for example, on the second floor of a wooden house 10. The second core 40 is provided, for example, on the periphery of the opening 31 in the floor member 30, directly above the first core 20. That is, as shown in Figs. 6A and 6B, a projection surface 39A of the first core 20 and a projection surface 39B of the second core 40 completely overlap each other.

As shown in Figure 3 (B), the second core 40 has four CLT panels 41 connected in a cylindrical shape with a rectangular cross section, and the cylindrical internal space 44 is divided into two internal spaces 45, 46 in the front-to-rear direction 8 by an internal wall 47. As with the first core 20, the number of CLT panels 41 may be changed as appropriate depending on the shape of the second core 40. The second core 40 is open at the top and bottom. The internal space 44 of the second core 40 is continuous with the internal space 24 of the first core 20.

Each CLT panel 41 is used as a bearing wall. Each CLT panel 41 has the same shape, with the same thickness, width, and length in the vertical direction 7, although not all CLT panels 41 necessarily have the same shape. A CLT panel 41 is arranged on each of the four outer surfaces of the cylindrical second core 40. Of course, two or more CLT panels 41 may be arranged on each surface of the second core 40, each joined with known joining materials. Each CLT panel 41 that makes up the second core 40 is joined and fixed to the floor material 30 with joining materials such as bolts. Note that CLT panels 41 arranged in the cross direction are preferably joined together in the same way as CLT panels 21, and are joined with joining materials such as screws or drift pins.

As shown in Figure 3(B), the second core 40 has openings 42 and 43. The openings 42 and 43 are formed in some of the multiple CLT panels 41 that make up the second core 40. Among the CLT panels 41, the CLT panel 41 with the opening 42 is referred to as CLT panel 41A, the CLT panel 41 with the opening 43 is referred to as CLT panel 41B, and the CLT panel 41 without an opening is referred to as CLT panel 41C. The CLT panel 41A extends in the up-down direction 7 and the left-right direction 9 on the front surface of the second core 40.

The opening 42 is an entrance to the internal space 45 of the second core 40. The opening 42 connects the internal space 45 of the second core 40 to the outside in the front-to-rear direction 8. The opening 42 is located to the left of the CLT panel 41A and is open only downward. The opening 42 is positioned so that it does not overlap vertically with the opening 22. The length dimension of the opening 42 in the left-to-right direction 9 is less than half the length dimension of the CLT panel 41A in the left-to-right direction 9.

The main surface of the CLT panel 41B extends in the up-down direction 7 and the front-to-back direction 8 on the left side of the second core 40. The opening 43 connects the internal space 46 of the second core 40 to the outside in the left-to-right direction 9. The opening 43 is an entrance to the internal space 46 of the second core 40. The opening 43 is located behind the CLT panel 41B and is open only downward, but this is not limited to this. The length dimension of the opening 43 in the front-to-back direction 8 is less than half the length dimension of the CLT panel 41B in the front-to-back direction 8. The opening 43 is positioned so as to overlap the opening 22 in the vertical direction. It is preferable that each dimension of the opening 43 be the same as each dimension of the opening 22.

An elevator 29 is provided in the interior space 46. The interior wall 47 may or may not be made of CLT panels. It is preferable that the interior wall 47 be connected to the interior wall 27, and in this embodiment, a wooden block is sandwiched between them.

The CLT panels 41 that make up the second core 40 and the CLT panels 33 that make up the floor members 30 are each joined with joining members such as bolts. The second core 40 is supported by the floor members 30.

[Stairs 28]
3A, the stairs 28 are so-called folded stairs that extend across the internal space 25 of the first core 20 and the internal space 45 of the second core 40. The stairs 28 can be accessed through the opening 22 of the first core 20 and the opening 42 of the second core 40. The stairs 28 have a partition wall 48 (see FIG. 1) between the step on the opening 22 side and the step on the opening 42 side.

[External wall 50]
As shown in FIG. 1 , the exterior walls 50 separate the indoor and outdoor areas of the first floor. The exterior walls 50 are provided along the outer periphery of the floor members 30. The exterior walls 50 are composed of, for example, sashes 51 and posts 52 that support the sashes 51. In this embodiment, the posts 52 are arranged at the corners of the exterior walls 50 and at the center of each face in the front-to-back direction 8 or the left-to-right direction 9. In this embodiment, all of the exterior walls 50 are provided with sashes 51, but exterior walls, openings, etc. may be provided instead of the sashes 51. The exterior walls 50 do not need to be load-bearing walls, and can be configured as desired by the client.

[Floor member 60]
As shown in Figure 2, floor members 60 are members that make up the floor of the first floor. The floor members 60 may be any known material, such as wooden panel materials such as CLT or LVL. The floor members 60 are supported by, for example, the foundation 11 and beams (not shown). LVL is an abbreviation for Laminated Veneer Lumber.

[Indoor space 80]
As shown in Figure 2, in a wooden house 10, an indoor space 80 is defined by a first core 20, floor members 30, an exterior wall 50, and a floor member 60. The indoor space 80 is a living space around the first core 20, in which a bathroom, washroom, kitchen, storeroom, living room, etc. can be freely arranged, and sashes 51 and openings can be designed as needed without considering the arrangement of load-bearing walls in the exterior wall 50.

[External wall 70]
As shown in Fig. 1 , the exterior wall 70 separates the outdoor and indoor areas of the second floor. The exterior wall 70 is provided along the outer periphery of the floor member 30. The exterior wall 70 is, for example, a sash 71 and a support column 72 that supports the sash 71. In this embodiment, the sash 71 and the support column 72 are arranged in the same manner as the sash 51 and the support column 52 of the exterior wall 50. Note that, like the exterior wall 50, the exterior wall 70 may also be provided with an exterior wall, an opening, or the like, instead of the sash 71.

[Ceiling member 81]
As shown in FIG. 2 , the ceiling member 81 is a member that constitutes the ceiling of the second floor. The ceiling member 81 supports a roof (not shown). Like the floor member 30, the ceiling member 81 is formed by joining multiple CLT panels. The underside of the ceiling member 81 is joined to the upper surface of the CLT panel 41 of the second core 40. The ceiling member 81 is supported by the second core 40. Therefore, vertical loads applied to the ceiling member 81 in the attic space are transmitted to the second core 40. Note that, for example, if the ceiling member 81 is only required to have the strength to support the roof, other wooden panel materials may be joined to support the roof.

[Indoor space 90]
2, in the wooden house 10, an indoor space 90 is defined by the floor members 30, the second core 40, the ceiling members 81, and the exterior walls 70. The indoor space 90 is the living space around the second core 40, and like the indoor space 80, the bathroom, washroom, kitchen, storeroom, living room, etc. can be freely arranged, and the sashes 51 and openings can be freely designed without considering the arrangement of the load-bearing walls in the exterior walls 70.

[Effects of the embodiment]
Because the first core 20 supports the vertical load of the floor members 30, no bearing walls or pillars are required around the periphery of the floor members 30, i.e., on the exterior walls 50. This allows for greater freedom in the layout of the exterior walls 50, 70, realizing a wooden house 10 in which sashes and openings can be placed in any position. Furthermore, the high degree of freedom in the layout of the exterior walls 50, 70 also allows for greater freedom in the layout of the indoor spaces 80, 90.

The first core 20 and second core 40 have the same cylindrical shape and completely overlap on the projection plane 39 (39A, 39B), so there is no imbalance in the vertical load support capacity of the first core 20 and second core 40.

The first core 20 and second core 40 have openings 22, 23, 42, 43 in the CLT panels 21, 41, allowing the internal spaces 24, 44 of the first core 20 and second core 40 to be used.

The horizontal length of the openings 22, 23, 42, and 43 provided in the first core 20 and second core 40 is less than half the horizontal length of the surface on which each opening 22, 23, 42, and 43 is provided, thereby ensuring the required strength of each CLT panel 21 and 41.

Because the internal space 24 of the first core 20 and the internal space 44 of the second core 40 are continuous, elevators or other lifting means can be placed in the internal spaces 24, 44 of the first core 20 and the second core 40.

[Modification]
In the above embodiment, the first core 20 and the second core 40 are cylindrical with a rectangular cross section, but instead, they may be cylindrical with a triangular, pentagonal, or other polygonal cross section.

In addition, in the above embodiment, the first core 20 and the second core 40 have the same cylindrical shape and completely overlap on the projection plane 39 (39A, 39B). However, the first core 20 and the second core 40 may have different cylindrical shapes and only partially overlap on the projection plane 39. In addition, the first core 20 and the second core 40 may have the same cylindrical shape but only partially overlap on the projection plane 39.

Furthermore, the first core 20 does not have to have openings 22, 23, and the internal space 24 of the first core 20 does not have to be used as living space. Similarly, the second core 40 does not have to have openings 42, 43, and the internal space 44 of the second core 40 does not have to be living space.

Furthermore, the first core 20 and the second core 40 may have openings on the surfaces not provided with the openings 22, 23, 42, and 43, with a length dimension of less than half the length dimension of the CLT panel 21 along the front-to-back direction 8 or left-to-right direction 9.

Also, while openings 22, 23, 42, and 43 were shown open only downward, they may also be open both upward and downward.

Furthermore, in the above embodiment, openings 22 and 42 were provided on the front surface of the first core 20 or second core 40, but they may also be provided on the rear surface, left side surface, or right side surface. Furthermore, in the above embodiment, openings 23 and 43 were provided on the left side surface of the first core 20 or second core 40, but they may also be provided on the front surface, rear surface, or right side surface.

In addition, in the above embodiment, the opening 43 was provided on the same side as the opening 23, but it may also be provided on the side opposite the opening 23.

Furthermore, in the above embodiment, the internal spaces 24, 44 of the first core 20 and the second core 40 are defined by the inner walls 27, 47, but they may each be a single space without the inner walls 27, 47.

Furthermore, the internal spaces 24, 44 of the first core 20 and the second core 40 may not be provided with elevators such as stairs 28 or elevators 29, and may instead be used as toilets, storage rooms, etc.

Floor member 30 may also have no opening 31 and separate the internal spaces 24, 44 of the first core 20 and second core 40. In this case, it is preferable that floor member 30 have CLT panels between four CLT panels 33, but this is not limited to this and other wood panel materials may also be used.

In the above embodiment, the opening 31 in the floor member 30 is located at the center of the floor member 30 in the front-to-rear direction 8 and the left-to-right direction 9, but it does not have to be located at the center, as long as it is located inside the outer periphery.

In the above embodiment, the exterior wall 50 was provided along the outer periphery of the floor member 30, but it may also be provided inside the periphery and outside the first core 20. Furthermore, the exterior wall 50 does not have to be continuous in an annular shape, and both ends may be connected to the CLT panel 21. In this case, the top surfaces of the CLT panel 21 and the floor member 30 are partially exposed to the outside. Furthermore, like the exterior wall 50, the exterior wall 70 may also be provided inside the outer periphery of the floor member 30.

[Appendix 1]
a first core in which CLT panels are connected in a cylindrical shape;
a floor member supported by the first core and having a plurality of CLT panels joined together so as to be able to support a horizontal load-bearing force;
A second core is supported on the floor member and has CLT panels connected thereto in a cylindrical shape.
the first core and the second core at least partially overlap on a projection plane,
A wooden house in which an indoor space is formed below the floor members.

[Appendix 2]
The wooden house described in Appendix 11, wherein the first core and the second core have the same cylindrical shape and overlap on the projection plane.

[Appendix 3]
The wooden house according to claim 1 or 2, wherein at least one of the first core and the second core has an opening in the CLT panel.

[Appendix 4]
A wooden house according to claim 1, wherein the internal space of the first core and the internal space of the second core are continuous.

[Appendix 5]
A wooden house according to Appendix 4, wherein stairs are provided in the internal space of the first core and the internal space of the second core.

10... Wooden house 20... First core 21... CLT panels 22, 23... Opening 24... Internal space 28... Stairs 30... Floor member 32... CLT panel 39... Projection surface 40... Second core 42, 43... Opening 44... Internal space 41... CLT panel 80... Indoor space

Claims (5)

a first core in which CLT panels are connected in a cylindrical shape;
a floor member supported by the first core and having a plurality of CLT panels joined together so as to be able to support a horizontal load-bearing force;
A second core is supported on the floor member and has CLT panels connected thereto in a cylindrical shape.
the first core and the second core at least partially overlap on a projection plane,
A wooden house in which an indoor space is formed below the floor members. The wooden house described in claim 1, wherein the first core and the second core have the same cylindrical shape and overlap in the projection plane. The wooden house described in claim 1 or 2, wherein at least one of the first core and the second core has an opening in the CLT panel. The wooden house described in claim 1, wherein the internal space of the first core and the internal space of the second core are continuous. The wooden house described in claim 4, wherein stairs are provided in the interior spaces of the first core and the second core.