JP7520617B2 - building - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act October 10, 2019: Disclosure due to commencement of construction after issuance of the confirmation certificate May 14, 2020: Disclosure in "Nikkei Architecture, May 14, 2020 issue, items 35-37" published by Nikkei Business Publications May 14, 2020: Disclosure at https://xtech.nikkei.com/atcl/nxt/mag/na/18/00104/050700004/ March 26, 2020: Disclosure due to inspection certificate

The present invention relates to buildings.

The following Patent Document 1 shows a roof with a large span structure in an arch shape.

JP 2000-17768 A

In the building of Patent Document 1, horizontal stiffeners are placed between the arch-shaped laminated timber beams. This creates a rectangular structural surface in the area surrounded by the laminated timber beams and the horizontal stiffeners.

If the structural surface is square, when a horizontal force acts on the roof, the diagonals tend to deform in either direction, either moving away from or towards each other. When the structural surface deforms, the shape of the entire roof also deforms, and the thrust force acting on the columns supporting the roof increases. When the thrust force increases, the cross-section of the columns needs to be made larger, and a large-scale mechanism needs to be installed to resist the thrust force.

Taking the above facts into consideration, the present invention aims to provide a building that can reduce the thrust force acting from the roof to the supporting structure.

The building of claim 1 has a downwardly curved roof formed in a triangular grid truss shape with beams extending in three different directions in a plan view, and a supporting structure on which the beams are erected.

In the building of claim 1, the roof is curved downward. Therefore, a thrust force in the tensile direction acts from the roof on the supporting structure on which the roof is erected.

The roof is formed in a triangular grid truss shape with beams extending in three different directions in a plan view. The triangular grid structural surface is less likely to deform even when a force acts in the in-plane direction. Therefore, the roof has higher in-plane rigidity and is less likely to deform in the in-plane direction compared to a roof that is not formed in a triangular grid truss shape. This makes it possible to reduce the thrust force acting from the roof to the supporting structure.
The building of claim 2 is the building of claim 1, wherein the beams include a first directional beam, a second directional beam and a third directional beam, the first directional beam extending along a straight line and the second directional beam and the third directional beam extending along a curve.
A building of claim 3 is the building of claim 2, in which a thrust force acts on the roof in a direction intersecting the first direction beam, the second direction beam, and the third direction beam.
A building according to claim 4 is the building according to claim 2, wherein the first direction beam is arranged at an incline from one side in the extension direction to the other side.

The building of claim 5 is a building described in any one of claims 2 to 4 , in which the first direction beam, the second direction beam and the third direction beam are each made of wood, and at the joints between the first direction beam, the second direction beam and the third direction beam, the first direction beam is used as a through material, and the second direction beam and the third direction beam are positioned against the sides of the first direction beam and joined to the first direction beam using a through bolt that passes through the first direction beam.

In the building of claim 5 , the roof comprises a first direction beam, a second direction beam and a third direction beam made of wood. At the joints of these beams, the second direction beam and the third direction beam are arranged against the sides of the first direction beam and are connected to the first direction beam with through bolts.

In other words, these beams are arranged on the same structural plane and are connected. This increases the rigidity of the roof in the directions along the first, second and third direction beams, making it less likely to deform in the in-plane direction. This reduces the thrust force acting from the roof to the supporting structure.

The roof also curves downward. For example, if the roof is shaped like a catenary curve or a curved surface, a tensile force acts on the supporting structure as an "axial force" from at least one of the first direction beam, the second direction beam, and the third direction beam.

In this way, in this embodiment, axial force, not bending force, acts on the wooden beam. Therefore, the strength can be expected from the entire cross section of the beam. This allows the beam width to be smaller than that of a curved beam.

Furthermore, stress is transmitted between components at the joints using through bolts. This results in less cross-sectional damage to the wood compared to when components are connected with braces, etc. This makes it less likely that the axial strength will be reduced.

The building of claim 6 is the building of any one of claims 1 to 5 , wherein the supporting structure is a column erected from a foundation, and the upper end of the column and the foundation are connected by a thrust force handling mechanism that handles thrust forces acting from the roof.

In the building of claim 6 , the upper end of the column as the supporting structure is connected to the foundation via the thrust force handling mechanism. Therefore, the thrust force acting on the upper end of the column from the roof can be borne by the thrust force handling mechanism. This allows the cross-sectional area of the column to be reduced.

The building of claim 7 comprises a downwardly curved roof formed in a triangular grid truss shape by beams extending in three different directions in a plan view, and a supporting structure on which the beams are erected, the supporting structure being columns erected from a foundation, the upper ends of the columns and the foundation being connected by a thrust force handling mechanism that handles the thrust force acting from the roof, the thrust force handling mechanism comprising: a backstay whose upper end is joined to the upper end of the column and whose lower end is joined to a floor beam of the second floor, a tension member whose upper end is joined to the floor beam and whose lower end is joined to the foundation, and a turnbuckle provided on the tension member.

The building of claim 7 is provided with a backstay, a tension member, and a turnbuckle as a thrust force handling mechanism. The tension of the turnbuckle can be adjusted. Therefore, different thrust forces can be handled using the same components. In other words, there is no need to change components depending on the magnitude of the thrust force acting. This allows the components to be unified, improving the design of the building.

The building of claim 8 comprises a triangular grid truss-like structure made up of beams extending in three different directions in a plan view, a downwardly curved roof, and a supporting structure on which the beams are erected, with floor beams on the second floor positioned so as to overlap with the beams in a plan view, and the joints of the floor beams being supported by columns on the first floor.

In the building of claim 8 , the floor beams of the second floor are arranged in a position where they overlap with the roof beams in a plan view. Since the roof beams extend in three different directions, the floor beams also extend in three different directions. As a result, one of the floor beams is arranged at an angle to the exterior wall of the building.

Here, the joints of the floor beams on the second floor are supported by the columns on the first floor. Because these floor beams are positioned at an angle to the exterior wall of the building, the columns on the first floor are positioned at an angle and at intervals to the exterior wall of the building.

This allows long components to be placed on the first floor of a building at an angle to the exterior wall of the building. Long components can be placed that are longer than the spacing between the columns on the first floor, or longer than the spacing between the front and rear exterior walls. Even if the exterior wall of the building is parallel to the road in front, long components can be taken in and out without having to cross the road significantly.

This invention makes it possible to reduce the thrust force acting from the roof to the supporting structure.

FIG. 3 is a cross-sectional elevation view showing a building according to an embodiment of the present invention, taken along line AA in FIG. 2. FIG. 2 is a plan view showing the arrangement of beams on the roof of a building according to an embodiment of the present invention. FIG. 2 is a plan view showing a beam joint in a roof of a building according to an embodiment of the present invention. FIG. 1A is a plan view showing the structure of the upper end of a backstay in a thrust force handling mechanism for a building according to an embodiment of the present invention, FIG. 1B is a front view, and FIG. FIG. 2A is a side view showing the structure of the lower end of a backstay in a thrust force handling mechanism for a building according to an embodiment of the present invention, and FIG. 2B is a front view. FIG. 2 is a plan view of the first floor of a building according to an embodiment of the present invention.

The following describes a building according to an embodiment of the present invention with reference to the drawings. Components indicated with the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may exist in multiples. Also, explanations of configurations and reference numerals that overlap in each drawing may be omitted. Note that the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications, such as omitting configurations or replacing them with different configurations, within the scope of the purpose of the present invention.

<Building>
A building 10 according to an embodiment of the present invention is a two-story building as shown in Fig. 1. The building 10 is a wooden structure including a foundation 12, columns 14, 16, beams 20, a roof 30, and a thrust force handling mechanism 40.

Note that Figure 1 is a conceptual diagram showing the structure of the building 10, and floor finishing materials, ceiling finishing materials, exterior wall materials, roofing materials, etc. are omitted from the illustration.

The foundation 12 may be an independent foundation, a strip foundation, a slab foundation, a pile foundation, or the like, and is constructed on the ground using concrete.

Column 14 is a wooden column erected from foundation 12, and supports beam 20. Column 14 is an interior column that is located inside the outer perimeter of building 10. Column 16 is also a wooden column erected from foundation 12, and supports beam 20. Column 16 is an example of a supporting structure in the present invention, and is an outer column that is located along the outer perimeter of building 10. Column 16 is also a through column, and supports roof 30.

Note that a "through pillar" is a pillar that is placed from the first floor to the second floor of the building 10. The pillar 16 may be made of a single piece of wood for both the first and second floors, or it may be made of multiple pieces of wood joined together vertically.

A roof 30 is installed on the upper ends of the pillars 16. A tie beam 18 is also placed below the portion where the roof 30 is installed. The tie beam 18 connects adjacent pillars 16 to each other.

<Roof>
(Beam)
As shown in FIG. 2, the roof 30 includes a first directional beam (beam 32), a second directional beam (beam 34), and a third directional beam (beam 36), each of which is made of wood.

The extension directions of beams 32, 34, and 36 differ from each other by 60 degrees in plan view. In addition, the joint between beams 32 and 34 coincides with the joint between beams 32 and 36. As a result, roof 30 is formed into a triangular grid (equilateral triangular grid) truss shape by beams 32, 34, and 36 extending in three different directions in plan view.

The roof 30 has a water gradient along the direction indicated by the arrow M. The roof 30 is shaped to follow a straight line in the direction indicated by the arrow M. On the other hand, the roof 30 is shaped to curve downward, specifically, to follow a catenary curve, in the direction indicated by the arrow N. The arrow M is the direction along the extension direction of the beams 32, and the arrow N is the direction perpendicular to the arrow M.

In other words, the beam 32 is a straight-line member that is tilted downward from one side of the extension direction to the other.

On the other hand, beams 34, 36 are curved members. Beams 34, 36 are curved and arranged so that roof 30 has a shape that follows a catenary curve along arrow N. Note that "curved" includes a case where beams 34, 36 themselves are made of curved material. It also includes a case where straight-form beams 34, 36 are attached at an angle at the joint with beam 32.

Since the roof 30 is shaped to follow a catenary curve along the arrow N, a thrust force acts from the roof 30 to the columns 16 (see Figures 1 and 6) in the direction along the arrow N. This thrust force acts as a tensile force from at least one of the beams 32, 34, and 36 to the columns 16. The thrust force along the arrow N also acts on each of the columns 16 as a component force in the direction along the beams 32, 34, and 36.

Here, for example, the pillar 16 located in area H1, which is enclosed by a dashed line in Figure 2, receives tensile force from beams 34 and 36. The pillar 16 located in area H2 receives tensile force from beams 32 and 34. Furthermore, the pillar 16 located in area H3 receives tensile force from beam 34. In this way, the number of beams to which the pillar 16 is joined varies depending on the position where the pillar 16 is located, and the beams that receive the tensile force also vary.

In other words, the thrust force acts as a tensile force on the column 16 from "at least one" of the beams 32, 34, and 36, which indicates that the beams that act on each column 16 with a tensile force do not necessarily coincide.

(Beam joint)
3, at the joints of the beams 32, 34, and 36, the beam 32 is a through member, and the beams 34 and 36 are disposed against the side surfaces of the beam 32. The beams 34 and 36 are joined to the beam 32 by through bolts B1 that pass through the beam 32.

In the following explanation, for convenience, one of the beams 36 (beam 36 on the right side of the paper in FIG. 3) joined to the beam 32 may be referred to as beam 36R, and the other beam 36 (beam 36 on the left side of the paper in FIG. 3) may be referred to as beam 36L, as necessary.

For example, to join beam 36 to beam 32, first, beam 34 is joined to beam 32. Next, beam 36R is placed against beam 32. At this time, beam 36R is placed against the joint between beam 32 and beam 34.

In the beam 36R, an insertion hole 36A is formed along the axial direction of the beam 36R. The insertion hole 36A is a hole that opens into the end face that is abutted against the joint between the beam 32 and the beam 34. In addition, the beam 32 is formed with a through hole 32A that communicates with the insertion hole 36A when the beam 36R is abutted against it.

With beam 36R butted up against beam 32, insert bolt B1 into through hole 32A. Through bolt B1 passes through through hole 32A and is inserted into insertion hole 36A.

Next, beam 36L is placed against beam 32. Like beam 36R, beam 36L has an insertion hole 36A formed along the axial direction. Insertion hole 36A is a hole that opens into the end face that is to be abutted against the joint between beam 32 and beam 34.

When placing the beam 36L against the beam 32, the through bolt B1 protruding from the through hole 32A toward the beam 36L is inserted into the insertion hole 36A of the beam 36L. The beam 36 is joined to the beam 32 by screwing nuts into both ends of the bolt B1.

Beams 36R and 36L each have a countersunk hole 36B that intersects with insertion hole 36A. Countersunk hole 36B is a hole that is drilled from one side surface of beams 36R and 36L toward the opposing side surface. A nut can be screwed into bolt B1 inserted into insertion hole 36A through countersunk hole 36B.

The method of joining beam 34 to beam 32 is similar to the method of joining beam 36 to beam 32, and a detailed explanation will be omitted. Beam 34 is formed with an insertion hole 34B that opens into the end face that is butted against the joint with beam 32. Beam 34 is also formed with a countersunk hole 34C that intersects with insertion hole 34B. Furthermore, beam 32 is formed with a through hole 32B that communicates with insertion hole 34B when beam 34 is butted against it.

When constructing the roof 30, the beams 32, 34, and 36 are placed in their designated positions and supported by shoring. The beams 32, 34, and 36 are then joined in sequence from the center of the roof 30 (the part with the lowest height from the ground surface) toward the outer periphery. This ensures that the stress state of the through bolts B1 placed at the joints of the beams 32, 34, and 36 is always the same as the stress state when the roof 30 is assembled.

Beams 32, 34, and 36 are members with approximately the same cross-sectional area and height. Beams 32, 34, and 36 are arranged on the same structural plane, and at their joints, their upper and lower surfaces are arranged at approximately the same height. This "structural plane" is a structural plane that follows a catenary curve in the direction indicated by arrow N in Figure 2, and is a curved surface.

Note that "substantially equal cross-sectional area," "substantially equal height," and "substantially the same height" include cases in which these values are completely equal, as well as cases in which the difference is within approximately 25% of the cross-sectional area and height of beam 32. Specifically, for example, the beam 32 may be formed to have a large beam width, and beams 34 and 36, which have a smaller beam width than beam 32, may be joined to beam 32.

The beam 32 is a through member at the joints of the beams 32, 34, and 36, but can be divided in other parts. In this case, the joints can be formed by any method. For example, Figure 3 shows an example in which the joint of the beam 32 is formed by a chase large plug joint.

<Thrust force processing mechanism>
The thrust force handling mechanism 40 is a structure that connects the upper ends of the columns 16 and the foundation 12, and handles the thrust force acting from the roof 30. As shown in Fig. 1, the thrust force handling mechanism 40 is formed with a backstay 42, a steel rod 44 as a tensile member, and a turnbuckle 46 (see Fig. 5). Note that the steel rod 44 may be a wire or the like as long as it is capable of resisting tensile force.

(Backstay)
As shown in Figures 4(A) to 4(C) and 5, the upper end of the backstay 42 is joined to the upper end of the column 16, and the lower end is joined to the beam 20 which is the floor beam of the second floor. Note that Figure 4(A) is a partial enlarged view of the area H1 enclosed by the dashed line in Figure 2.

The backstay 42 is made of wood, but the embodiment of the present invention is not limited to this, and any material capable of bearing tensile forces may be used. For example, the backstay 42 can be made of various steel materials such as angle iron, channel iron, H-shaped steel, and flat bars.

The structure of the upper end of the backstay 42 will be described. As shown in FIG. 4(B), a joint plate 16A is fixed to the upper end surface of the column 16. The joint plate 16A is a metal (e.g., steel) plate that protrudes upward from the upper end surface of the column 16. A base plate 16B is welded to the lower end of the joint plate 16A. This base plate 16B is fixed to the upper end surface of the column 16 with anchor bolts. In other words, the joint plate 16A is joined to the upper end surface of the column 16 via the base plate 16B.

As shown in FIG. 4(A), the ends of the beams 34 and 36 are disposed on both sides of the joint plate 16A. In other words, the joint plate 16A is sandwiched between the ends of the beams 34 and 36. Furthermore, the upper ends of a pair of backstays 42 are disposed on both sides of the joint plate 16A, the beams 34 and the beams 36. In other words, the joint plate 16A, the beams 34 and the beams 36 are sandwiched between the upper ends of the pair of backstays 42.

The joint plate 16A, the beams 34 and 36 are sandwiched between the upper ends of the pair of backstays 42, and these joint plates 16A, the beams 34 and 36 and the pair of backstays 42 are connected by through bolts B2. As a result, the axial force acting on the beams 34 and 36 is transmitted to the column 16 and the backstays 42 as a tensile force toward the inside of the roof 30.

In the following description, the axial forces acting on beams 34 and 36 may be referred to as "tensile force T1" using the same reference symbol. However, the magnitudes of the axial forces acting on beams 34 and 36 may be different from each other.

In this embodiment, the tip of the insertion bolt B3 is welded to the joining plate 16A. The axial direction of the insertion bolt B3 is aligned along the extension direction of the beams 34, 36, and the insertion bolt B3 is inserted into the insertion holes 34D, 36D formed in the end faces of the beams 34, 36. A nut is screwed onto the insertion bolt B3 through a countersunk hole formed in the side of the beams 34, 36.

As a result, the tensile force T1 is transmitted to the joining plate 16A. The tensile force T1 is also transmitted from the joining plate 16A to the backstay 42 via the insertion bolt B3.

Next, the structure of the lower end of the backstay 42 will be described. As shown in Figures 5(A) and (B), the lower end of the backstay 42 is joined to the beam 20. Specifically, as shown in Figure 5(B), the lower ends of a pair of backstays 42 are arranged on both sides of the beam 20. In other words, the beam 20 is sandwiched between the lower ends of the pair of backstays 42.

In addition, with the beam 20 sandwiched between the lower ends of the pair of backstays 42, the beam 20 and the pair of backstays 42 are connected by through bolts B4. This allows the axial force (tensile force T2) acting on the backstays 42 to be transmitted to the beam 20.

As shown in FIG. 1, the beam 20 is a floor beam for the second floor supported by the column 14. The beam 20 is a cantilever beam at the portion that protrudes from the column 16 to the outside. The tip of the beam 20 is connected by a connecting beam 22 as shown in FIG. 5 (A).

(steel bars, turnbuckles)
The steel rod 44 is a tensile member having an upper end joined to the beam 20 and a lower end joined to the foundation 12. The steel rod 44 is inserted into a through hole 20A that passes vertically through the beam 20, and a nut is screwed into the upper end. The lower end of the steel rod 44 is fixed to a connecting member 12A fixed to the foundation 12 of the building 10. Furthermore, a turnbuckle 46 is provided in the middle of the steel rod 44.

As a result, the axial force (tensile force T2) acting on the backstay 42 is transmitted to the steel rod 44 via the beam 20. In addition, the axial force (tensile force T3) acting on the steel rod 44 is transmitted to the foundation 12.

<Building floor plan>
6 is a schematic plan view of the first floor of the building 10. In this figure, dashed lines 20L1, 20L2, and 20L3 indicate the center line of the beam 20 (see FIG. 1), which is a floor beam on the second floor. The beam 20 is disposed at a position overlapping the beams 32, 34, and 36 shown in FIG. 2 in a plan view.

Specifically, the beam 20 along the dashed line 20L1 is arranged at a position where it overlaps with the beam 32 in a plan view. The beam 20 along the dashed line 20L2 is arranged at a position where it overlaps with the beam 34 in a plan view. The beam 20 along the dashed line 20L3 is arranged at a position where it overlaps with the beam 36 in a plan view.

The columns 14 support the beams 20 from below at the intersections (joints) of the beams 20 that extend in three directions.

In FIG. 6, the two-dot chain line E indicates the boundary between the site on which the building 10 is constructed and the other land. The site boundary line on the upper side of the page in FIG. 6 faces road R. An opening W is provided in the wall facing road R on the first floor of the building 10. The opening W is an opening through which pedestrians can enter and exit.

<Action and Effects>
In the building 10 according to the embodiment of the present invention, the roof 30 is curved downward as shown in Fig. 1. Therefore, a thrust force acts from the roof 30 on the columns 16, which are the supporting structure on which the roof 30 is erected, in a tensile direction (the direction in which the opposing columns 16 are installed in Fig. 1).

As shown in Figure 2, the roof 30 is formed in a triangular grid truss shape by beams 32, 34, and 36 extending in three different directions in a plan view. The triangular grid structural surface is less likely to deform even when a force acts in the in-plane direction. Therefore, compared to a case where the roof 30 is not formed in a triangular grid truss shape (for example, a case where the roof is formed in a square lattice grid), the roof 30 has high in-plane rigidity and is less likely to deform in the in-plane direction. This makes it possible to reduce the thrust force acting from the roof 30 to the columns 16 (see Figure 1), which are the supporting structure.

In addition, in the building 10 according to the embodiment of the present invention, as shown in FIG. 3, the roof 30 has wooden beams 32, 34, and 36. At the joints between these beams 32, 34, and 36, the beams 34 and 36 are positioned against the side of the beam 32 and are joined to the first direction beam with through bolts B1.

In other words, these beams 32, 34, and 36 are arranged and connected to the same structural plane (structural plane along the catenary curve). This increases the rigidity of the roof 30 in the direction along the beams 32, 34, and 36, making it difficult for the roof 30 to deform in the in-plane direction. This reduces the thrust force acting from the roof 30 to the columns 16.

In addition, in the building 10, the roof 30 curves downward and is shaped to follow a catenary curve. Therefore, a tensile force acts on the column 16 as an "axial force" from at least one of the beams 32, 34, and 36.

In this way, in this embodiment, an "axial force" acts on the wooden beams 32, 34, and 36, rather than a "bending force." Therefore, the overall strength of the cross section of the beams 32, 34, and 36 can be expected. This allows the beam width to be smaller than that of a bending beam. In addition, creep deformation is less likely to occur in the beams 32, 34, and 36.

Furthermore, as shown in Figure 3, at the joints of beams 32, 34, and 36, stress between the members is transmitted by through bolts B1. This results in less cross-sectional loss of the wood compared to when the members are connected by braces or other means. This makes it difficult for the axial strength to decrease.

In addition, in the building 10 according to the embodiment of the present invention, as shown in FIG. 1, the upper end of the column 16 serving as the supporting structure is connected to the foundation 12 via a thrust force handling mechanism 40. This allows the thrust force acting on the upper end of the column 16 from the roof 30 to be borne by the thrust force handling mechanism 40. This allows the cross-sectional area of the column 16 to be reduced.

As shown in Figures 4(A)-(C) and 5(A) and (B), the thrust force handling mechanism 40 includes a backstay 42, a steel rod 44 as a tension member, and a turnbuckle 46. The tension of the turnbuckle 46 can be adjusted. This means that the same member can be used to handle different thrust forces. In other words, there is no need to change members depending on the magnitude of the thrust force acting. This makes it possible to standardize the members and improve the design of the building.

The lower end of the steel rod 44 is fixed to the foundation 12. The weight of the building 10 acts on the foundation 12 via the columns 16 and 14. This allows the building 10 to handle thrust forces by utilizing its own weight.

In addition, in the building 10 according to the embodiment of the present invention, as shown by dashed lines 20L1, 20L2, and 20L3 in FIG. 6, beam 20, which is a floor beam on the second floor, is positioned so as to overlap beams 32, 34, and 36 (see FIG. 2) of roof 30 in a plan view. Since beams 32, 34, and 36 of roof 30 extend in three different directions, beam 20, which is a floor beam, also extends in three different directions. As a result, of beams 20, beams 20 that run along beams 32 and 34 are positioned at an angle to the exterior wall of the building (exterior wall R1 facing road R).

Here, the joints of the beams 20 are supported by the columns 14 on the first floor. These beams 20 (beams 20 along dashed lines 20L1 and 20L2) are arranged at an angle to the exterior wall R1 of the building. Therefore, the columns 14 on the first floor are arranged at an angle with a gap from the exterior wall R1 of the building.

This allows long members to be placed on the first floor of the building 10 at an angle to the exterior wall R1 of the building. As long members, members longer than the spacing between the columns on the first floor (e.g., long member K1) or members longer than the spacing between the front exterior wall (exterior wall R1) and the rear exterior wall (exterior wall R2) (e.g., long member K2) can be placed. In addition, as shown by the arrow EX, long members K2 and the like can be taken in and out without crossing the road R significantly. One example of a long member is a racing boat (canoe).

In addition, brackets for hanging items can be installed on the pillars 14. By installing brackets on the pillars 14, multiple long members can be stored in the vertical direction.

In this embodiment, the lower end of the backstay 42 is joined to the beam 20, and the beam 20 and the foundation 12 are connected by the steel rod 44, but the embodiment of the present invention is not limited to this. For example, the lower end of the backstay 42 may be fixed to the foundation 12. In this case, it is preferable to provide a counterweight that can resist thrust forces.

If the lower end of the backstay 42 is fixed to the foundation 12, the building 10 may be one story. Also, regardless of where the backstay 42 is fixed, the building 10 may be three or more stories.

In addition, in this embodiment, a thrust force handling mechanism 40 is provided, but the embodiment of the present invention is not limited to this. For example, the thrust force handling mechanism 40 does not necessarily have to be provided. Even if the thrust force handling mechanism 40 is not provided, the effect of reducing the thrust force can be obtained by forming the roof 30 in a triangular grid truss shape.

In addition, in this embodiment, the supporting structure on which the beams 32, 34, and 46 are erected is the column 16, but the embodiment of the present invention is not limited to this. For example, instead of the column 16, a wall having the strength to resist thrust forces may be used. This wall may be made of wood or concrete. In addition, the wall may be formed, for example, in a circular shape when viewed from above, and may be designed to resist inward tensile forces.

In addition, in this embodiment, the extension directions of the beams 32, 34, and 36 are different from each other by 60 degrees, and the roof 30 is formed in a truss shape of an equilateral triangular grid, but the embodiment of the present invention is not limited to this. As long as the beams 32, 34, and 36 form a triangular grid, the angles of the extension directions of these beams 32, 34, and 36 are arbitrary.

10 Building 12 Foundation 14 Pillar (1st floor pillar)
16 Pillar (support structure)
20 Beam (floor beam)
30 Roof 32 Beam (first direction beam)
34 Beam (second direction beam)
36 Beam (third direction beam)
B1 through bolt 40 thrust force handling mechanism 42 back stay 44 steel bar (tensile material)
46 Turnbuckle

Claims (8)

The roof is curved downwards and is formed into a triangular grid truss shape by beams extending in three different directions in plan view.
A supporting structure on which the beam is erected;
A building equipped with. The beam comprises a first directional beam, a second directional beam and a third directional beam;
The first directional beam is along a straight line, and the second directional beam and the third directional beam are along a curved line.
The building according to claim 1. A thrust force acts on the roof in a direction intersecting the first direction beam, the second direction beam, and the third direction beam.
The building according to claim 2 . The first directional beam is disposed so as to be inclined from one side to the other side in the extension direction.
The building according to claim 2. The first direction beam, the second direction beam, and the third direction beam are each made of wood,
At a joint portion of the first direction beam, the second direction beam, and the third direction beam,
The first direction beam is a through member,
The second direction beam and the third direction beam are arranged against the side surfaces of the first direction beam and are joined to the first direction beam using a through bolt passing through the first direction beam.
A building according to any one of claims 2 to 4 . The supporting structure is a column erected from a foundation,
The building according to any one of claims 1 to 5 , wherein the upper ends of the columns and the foundations are connected by a thrust force handling mechanism that handles thrust forces acting from the roof. The roof is curved downwards and is formed into a triangular grid truss shape by beams extending in three different directions in plan view.
A supporting structure on which the beam is erected;
Equipped with
The supporting structure is a column erected from a foundation,
The upper end of the column and the foundation are connected by a thrust force handling mechanism that handles the thrust force acting from the roof,
The thrust force handling mechanism includes:
A backstay having an upper end connected to the upper end of the column and a lower end connected to a floor beam of the second floor;
A tension member having an upper end connected to the floor beam and a lower end connected to the foundation;
A turnbuckle provided on the tension member;
A building equipped with: The roof is curved downwards and is formed into a triangular grid truss shape by beams extending in three different directions in plan view.
A supporting structure on which the beam is erected;
Equipped with
The floor beams of the second floor are arranged in a position overlapping with the beams in a plan view,
The joints of the floor beams are supported by columns on the first floor.
building.