JP7491492B2 - Extension units and unit buildings - Google Patents

Description

The present invention relates to a projection unit and a unit building.

Patent Document 1 discloses an extension unit that is provided on the upper floors of a unit building and forms an extension. In this extension unit, the ends of the columns and beams are rigidly joined on one girder surface (structural surface) that is connected to the building unit of the building body. In addition, the ends of the columns and beams on the other girder surface that is arranged opposite the one girder surface and faces the outside of the building are pin-jointed. This increases the rigidity of the one girder surface that connects the extension unit and the building unit, and ensures the durability of the building body without increasing the cross-section of the columns and beams on the building unit side.

JP 2010-261259 A

However, in the above-mentioned prior art, the rigidity of the girder surface of the extension unit increases at the connection between the building unit and the extension unit, which may cause the center of rigidity of the entire building to move closer to the connection, increasing the eccentricity of the building. For this reason, it is desirable to provide a means for suppressing twisting of the building caused by eccentricity.

In addition, because the columns and beams of the girder surface of the above-mentioned extension unit, which are arranged facing the outer perimeter of the building, are joined using pin joints, the rigidity against vertical loads is reduced at the tip of the gable surface. This increases the stress load borne by the ceiling and floor of the extension unit, which may restrict the dimensions and specifications of the extension portion. As a result, there is a risk of reducing the degree of freedom in designing the extension portion of the building.

Taking the above facts into consideration, the present invention aims to provide an extension unit and a building that can suppress twisting of the building and increase the freedom of design of the extension part.

The projection unit according to the first aspect is a rectangular box-shaped projection unit that is connected to a building unit that constitutes the upper floor of a multi-story unit building, forms a projection that protrudes from the upper floor, and has four columns erected at the four corners. Two columns arranged on one girder surface connected to the building unit are joined to a beam connecting the two columns by pin joints, and at a pair of gable surfaces arranged on both sides of the one girder surface, two columns arranged on each of the pair of gable surfaces are joined to a beam connecting the two columns by rigid joints.

The extension unit according to the first aspect is connected to a building unit that constitutes the upper floor of the unit building, and constitutes an extension that extends from the upper floor. This extension unit is formed in a rectangular box shape, with four columns erected at the four corners. In addition, on one girder surface that is connected to the building unit, two columns and a beam that connects these columns together are joined by pin joints. This makes it possible to suppress eccentricity of the unit building compared to when one girder surface that is connected to the building unit is rigidly joined, and to suppress twisting of the building during earthquakes, etc.

Furthermore, the pair of end faces of this extension unit are rigidly joined to two columns arranged on the end faces and to a beam connecting these columns. This increases the rigidity of the end faces and reduces the load on the ceiling and floor of the extension unit. As a result, the freedom of design of the extension can be increased.

Note that a pin joint means a so-called "design pin joint," and strictly speaking, part of the moment applied to the joint is absorbed at the pin joint.

The extension unit according to the second aspect is configured as described in the first aspect, in which the beam includes a web portion that extends vertically in a longitudinal cross-sectional view and a flange portion that bends at a right angle from at least one of the upper and lower ends of the web portion and extends horizontally, the pin joint is configured by welding the web portion of the beam to the column, and the rigid joint is configured by welding the web portion and flange portion of the beam to the column.

In the extension unit according to the second aspect, the ends of the beams are welded in two different configurations to form a pin joint structure and a rigid joint structure between the pillar and the beam. Specifically, the pin joint is formed by welding only the web portion of the beam to the pillar. On the other hand, the rigid joint is formed by welding the web portion and the flange portion of the beam. In this way, no separate parts are required to form a pin joint or rigid joint between the pillar and the beam, so the number of parts can be reduced compared to when a joint is formed via a bracket or the like.

The extension unit according to the third aspect is configured as described in the first or second aspect, in which the two columns arranged on the other girder surface facing the outer periphery of the unit building are joined by pin joints to a beam connecting the two columns.

In the third aspect of the extension unit, two columns and a beam connecting these columns are connected by pin joints on a pair of opposing girder surfaces, i.e., one girder surface that is connected to the building unit and the other girder surface that faces the outer periphery of the unit building. This makes it possible to further suppress eccentricity of the unit building and to suppress twisting of the building during earthquakes, etc.

The extension unit according to the fourth aspect is configured as described in the first or second aspect, in which the two columns arranged on the other girder surface facing the outer periphery of the unit building are rigidly connected to a beam connecting the two columns.

In the extension unit of the fourth aspect, the two columns and the beam connecting these columns are rigidly joined on the other girder surface facing the outer periphery of the unit building. This increases the rigidity of the other girder surface facing the outer periphery of the unit building against vertical loads. As a result, the resistance of the tip side (other girder surface) of the extension unit against tip loads from the exterior wall and roof increases, allowing for greater design freedom in the extension amount and specifications of the extension unit.

The extension unit according to the fifth aspect is configured as described in any one of the first to fourth aspects, in which the girder surface of one of the girder surfaces is rotatably connected to the girder surface of the building unit arranged opposite it via a connecting part.

In the extension unit according to the fifth aspect, the extension unit and the girder surface of the building unit are rotatably connected via a connecting part. This allows only the vertical load due to the weight of the extension unit to be transmitted to the structural surface (girder surface) of the building unit, and does not transmit any moment. This ensures the rigidity of the structural surface of the building unit, which contributes to reducing the stress burden on the unit building. As a result, the durability of the unit building to which the extension unit is joined can be improved.

The unit building according to the sixth aspect comprises a multi-story building main body, a building unit constituting the upper floor of the building main body and formed in a rectangular box shape with four pillars erected at the four corners, and the projection unit according to any one of claims 1 to 5, and the projection unit is joined to the building unit by connecting the joint faces of the ceiling and floor of one girder surface to the joint faces of the ceiling and floor of the girder surface of the building unit arranged opposite each other.

In the unit building according to the sixth aspect, both the building unit and the overhang unit are formed in a rectangular box shape with four pillars erected at the four corners. The overhang unit and the building unit are arranged so that the joint faces of the ceiling and floor parts of the girder surfaces face each other. The building unit and the overhang unit are connected at the joint faces. In other words, in the unit building, the building unit and the overhang unit have the same joint surface specifications and overall structure. This allows the components of both to be standardized, resulting in excellent productivity.

As described above, the extension unit according to the first aspect has the excellent effect of suppressing twisting of the building and increasing the degree of freedom in designing the extension part.

The extension unit according to the second aspect has the excellent effect of reducing the number of components.

The extension unit according to the third aspect has the excellent effect of further suppressing the eccentricity of the unit building and suppressing the twisting of the building during an earthquake, etc.

The extension unit according to the fourth aspect has the excellent effect of increasing the degree of design freedom with regard to the extension amount and specifications of the extension unit.

The fifth aspect of the extension unit has the excellent effect of improving the durability of the unit building to which the extension unit is joined.

The sixth aspect of the unit building allows the building unit and the projection unit to use the same components, resulting in superior productivity.

FIG. 2 is a perspective view of a unit building according to the first embodiment. FIG. 2 is an enlarged perspective view of an area P shown in FIG. FIG. 2 is a side view partially showing the upper floor portion of the unit building shown in FIG. 1 . 4 is an enlarged cross-sectional view showing the state cut along line 4-4 in FIG. 3. 2 is a schematic diagram showing a bending moment acting on an end surface of the extension unit shown in FIG. 1 . FIG. FIG. 6 is a schematic diagram corresponding to FIG. 5 and illustrating a bending moment acting on an end surface of a projection unit as a comparative example. FIG. 7 is a perspective view of a unit building according to a second embodiment. FIG. 8 is a schematic diagram showing the stress state of the girder surface of the extension unit shown in FIG. 7 facing the outer periphery of the unit building. FIG. 9 is a schematic diagram corresponding to FIG. 8 and illustrating the stress state of a girder surface of a projection unit facing the outer periphery of a unit building as a comparative example.

First Embodiment
Hereinafter, a description will be given of an extension unit 18 according to a first embodiment and a unit building (hereinafter, referred to as "building 10") 10 including this extension unit 18 with reference to Figs. 1 to 6.

As shown in FIG. 1, the building 10 is constructed by assembling a building unit 14 constituting the lower floor (first floor) 12A of the building body 12 on a foundation (not shown), and assembling a building unit 16 constituting the upper floor (second floor) 12B of the building body 12 on the upper side of the building unit 14. An extension unit 18 is connected to the girder surface of the building unit 16.

In the present embodiment, the building 10 has a single building unit 14, 16 attached to the lower floor portion 12A and the upper floor portion 12B for ease of explanation, but the number of building units can be changed as appropriate.

The building units 14, 16 are formed in a rectangular box shape with four columns 20 erected at the four corners. The four columns 20 are arranged adjacent to each other along the girder surface and the end surface, and the upper ends and lower ends of each pair of columns 20 are connected by beams 22. Each column 20 is made of an iron square column. Each beam 22 is made of iron channel steel. For ease of explanation, the columns 20 and beams 22 of the building unit 14 are omitted in FIG. 1.

The extension unit 18 is joined to the girder surface (long side structural surface) of the building unit 16 constituting the upper floor portion 12B via a connecting portion 44 described later. This extension unit 18 is formed in a rectangular box shape with four columns 24 erected at the four corners, similar to the building units 14 and 16. The four columns 24 are connected by beams 26 at the upper ends and lower ends of two columns 24 arranged adjacent to each other along the girder surface and the gable surface. Each column 24 is composed of an iron square column. Each beam 26 is made of iron channel steel. More specifically, the beam 26 has a web portion 26A, an upper flange portion 26B, and a lower flange portion 26C (see FIG. 2). The web portion 26A extends vertically (in the building height direction) in a vertical cross-sectional view of the beam 26. Additionally, the upper flange portion 26B is bent at a right angle from the upper end of the web portion 26A and extends laterally (horizontally). Additionally, the lower flange portion 26C is bent at a right angle from the upper end of the web portion 26A and extends laterally (horizontally) and is disposed opposite the upper flange portion 26B.

As can be seen from the above configuration, the building units 14, 16 and the projection unit 18 have in common that the main components are steel square columns and channel steel. In addition, the building units 16 and the projection unit 18, which are joined at their girder surfaces, have the same dimensions in the extension direction of the columns 20, 24 and the long side beams 22, 26. As a result, the building units 16 and the projection unit 18 are arranged so that the joint surfaces 28 of the ceiling and floor parts face each other at the same height. In the following, the joint surface of the ceiling part provided at the upper end of the column 24 is referred to as joint surface 28C, and the joint surface of the floor part provided at the lower end of the column 24 is referred to as joint surface 28F. In addition, when there is no distinction between the joint surfaces 28C and 28F, they are simply referred to as joint surface 28 (see Figure 3).

The pair of girder faces 30 that make up the structural surface on the long side of the extension unit 18 are joined at their ends by pin joints 40, which are made up of two columns 24 and two beams 26. On the other hand, the pair of end faces 32 that make up the structural surface on the short side of the extension unit 18 are joined at their ends by rigid joints 42. In Figures 1 and 3, the pin joints 40 are shown as areas surrounded by dashed lines, and the rigid joints 42 are shown as shaded areas.

The detailed configuration of the pin joint 40 and rigid joint 42, which are essential parts of the present invention, will be described below with reference to Figure 2. In the following description, of the pair of girder surfaces 30 of the projection unit, the girder surface that is joined to the girder surface of the building unit 16 will be referred to as girder surface 30A, and the girder surface that is disposed facing the outer peripheral surface of the building body 12 will be referred to as girder surface 30B.

As shown in this figure, the pin joint 40 and the rigid joint 42 are formed by welding the ends of the beam 26 made of channel steel in two ways.

Specifically, the pin joint 40 is formed by welding only the web portion 26A of the beam 26 to the joint surface 28 of the column 24.

On the other hand, the rigid joint 42 is formed by welding the web portion 26A, the upper flange portion 26B, and the lower flange portion 26C of the beam 26 to the joint surface 28 of the column 24.

Next, the joining structure between the building unit 16 and the extension unit 18 will be explained using Figures 3 and 4. Note that Figure 3 shows the connecting portion 44 between the building unit 16 and the extension unit 18 from the side. Also, Figure 4 shows a planar cross section of the connecting portion 44.

As shown in these figures, the building unit 16 and the extension unit 18 are rotatably connected at their opposing girder surfaces via multiple connecting parts 44. More specifically, the multiple connecting parts 44 connect the joint faces 28C, 28F of the two columns 24 arranged on the girder surface 30A of the extension unit 18 to the joint faces 28C, 28F of the two columns 20 on the girder surface of the building unit 16 arranged opposite the girder surface 30A. In other words, the building unit 16 and the extension unit 18 are connected at a total of four points.

As shown in FIG. 4, each connecting portion 44 includes a pair of connecting brackets 46 fixed to the joint surface 28 on the building unit 16 side and the joint surface 28 on the projection unit 18 side, and a pin member 56 that rotatably connects the pair of connecting brackets 46.

Each connecting bracket 46 is composed of a pair of L-shaped members 48 formed with an L-shaped cross section. The L-shaped members 48 have a rotating portion 48A that forms one side of the L shape, and a fixed portion 48B that forms the other side of the L shape. The pair of L-shaped members 48 are arranged such that the rotating portions 48A overlap each other, and the fixed portions 48B extend in directions away from each other along the girder direction of the projection unit 18. Each fixed portion 48B is fixed to the corresponding joint surface 28 using a fastening member 50 such as a high-strength bolt. The joint surface 28 is reinforced by welding a metal reinforcing plate 52 to the inside surface.

With the above configuration, when the connecting brackets 46 are fixed to the joint faces 28 of the building unit 16 and the projection unit 18, the rotating parts 48A of the opposing connecting brackets 46 are positioned so that they overlap in the girder direction. In this state, the through holes 54 formed in the center of each rotating part 48A are arranged coaxially. A pin member 56 with its axial direction aligned with the girder direction is then inserted through the through hole 54. As a result, the projection unit 18 is rotatably connected to the building unit 16 using the pair of connecting brackets 46.

The notable feature of the present embodiment described above is that, first, in the projection unit 18, the ends of the columns 24 and beams 26 of the girder surface 30A that join with the building unit 16 are joined with pin joints 40, suppressing eccentricity of the building 10. In other words, when the ends of the columns 24 and beams 26 of the girder surface 30A are joined with pin joints 40, the rigidity of the girder surface 30A that is connected to the building unit 16 is prevented from being increased more than necessary, compared to a configuration in which the ends of the columns 24 and beams 26 are rigidly joined.

However, if the rigidity of the girder surface 30A of the projection unit 18 is increased more than necessary, it is expected that the center of rigidity of the building 10 will be biased toward the projection unit 18. In such a case, the eccentricity of the building 10 will increase by the amount that the rigidity of the girder surface 30A increases.

In the above embodiment, the above configuration is configured to prevent the rigidity of the girder surface 30A from being unnecessarily increased and to suppress eccentricity of the building 10. This makes it possible to suppress twisting of the building 10 during earthquakes, etc.

Moreover, it is worth noting that the rigidity of the end face 32 of the extension unit 18 against vertical loads is increased by joining the ends of the columns 24 and beams 26 of the end face 32 of the extension unit 18 with rigid joints 42. This will be explained using the schematic diagrams of Figures 5 and 6. Figure 5 is a side view that shows the end face 32 of the extension unit 18 of this embodiment. Meanwhile, Figure 6 is a side view corresponding to Figure 5, showing an extension unit 100 as a comparative example.

In the comparative example shown in FIG. 6, two columns 140 are arranged on the gable face 120, and the upper and lower ends of the two columns 140 are connected by beams 150. Also, in the comparative example, the ends of the columns 140 and beams 150 of the girder face 130A that is joined to the building unit 16 are joined by rigid joints 42, and the ends of the columns 140 and beams 150 of the girder face 130B that is arranged facing the outer periphery of the building 10 are joined by pin joints 40.

As shown in FIG. 6, when a vertical load F1 is input to the tip of the extension unit 100 of the above configuration, the bending moment M100 acting on the column 140 of the girder surface 130A acts with the middle part 140N in the extension direction (vertical direction of the building) as the neutral axis. The bending moment M100 gradually increases from the middle part 140N to the upper end and lower end of the column 140. Therefore, in the column 140, the stress is maximum at the upper end and lower end in the extension direction. On the other hand, the bending moment M200 acting on the beam 150 constituting the upper and lower parts of the gable surface 120 gradually increases from the tip to the base end of the beam 150. Therefore, in the beam 150, the stress is maximum at the base end joined to the girder surface 130A. In this way, in the extension unit 100 of the comparative example, stress is concentrated on the girder surface 130A side.

On the other hand, in the projection unit 18 of this embodiment shown in FIG. 5, the ends of the column 24 and the beam 26 on the gable surface 32 are joined together by a rigid joint 42, so that a bending moment M1 acts on both of the two columns 24 arranged on the gable surface 32. The bending moment M1 acts on the middle part 24N in the extension direction of the column 24 as a neutral axis, as in the comparative example, and gradually increases from the middle part 24N toward the upper end and lower end of the column 24. However, since the bending moment M1 acts on both of the two columns 24, the stress can be distributed to both columns 24. On the other hand, the bending moment M2 acting on the beam 26 constituting the upper and lower parts of the gable surface 32 acts on the middle part 26N in the extension direction (gable direction) as a neutral axis. Then, it gradually increases from the middle part 26N toward the tip and base end. As a result, the stress of the beam 26 is maximum at both ends in the extension direction. In other words, the stress of the beam 26 is distributed to both ends in the extension direction. In this way, in this embodiment, when a vertical load F1 is applied to the gable face 32, the stress is prevented from concentrating on the girder face 30A, and the stress is dispersed to improve the rigidity of the gable face.

(Action and Effects)
Next, the operation and effects of this embodiment will be described.

As described above, in this embodiment, the extension unit 18 is connected to the building unit 16 that constitutes the upper floor portion 12B of the building main body 12, and forms an extension that extends from the upper floor portion 12B. This extension unit 18 is formed in a rectangular box shape, with four columns 24 erected at the four corners. In one girder surface 30A that is joined to the building unit 16, the two columns 24 and the beam 26 that connects these columns 24 together are joined by pin joints 40. This makes it possible to suppress eccentricity of the building 10 compared to a case in which the columns and beams of one girder surface 30A that is connected to the building unit 16 are rigidly joined, and to suppress twisting of the building 10 due to earthquakes and strong winds.

Furthermore, the pair of end faces 32 of this extension unit 18 are joined by rigid joints 42 between the two columns 24 arranged on the end faces 32 and the beams 26 connecting these columns 24 together. This increases the rigidity of the end faces 32 and reduces the load on the ceiling and floor of the extension unit 18. As a result, the degree of freedom in designing the extension of the building 10 can be increased.

In addition, in this embodiment, the end of the beam 26 is welded in two configurations to form a pin joint structure and a rigid joint structure between the column 24 and the beam 26. Specifically, the pin joint 40 is formed by welding only the web portion 26A of the beam 26 to the column. On the other hand, the rigid joint 42 is formed by welding the web portion 26A, upper flange portion 26B, and lower flange portion 26C of the beam 26. In this way, since no separate parts are required to form the pin joint 40 or rigid joint 42 between the column 24 and the beam 26, the number of parts can be reduced compared to a configuration in which a joint is formed via a bracket or the like.

In addition, in this embodiment, in a pair of girder surfaces 30A, 30B arranged opposite each other, i.e., one girder surface 30A joined to the building unit 16 and the other girder surface 30B facing the outer periphery of the building 10, two columns 24 and a beam 26 connecting these columns 24 are each joined by a pin joint 40. This makes it possible to further suppress eccentricity of the building 10 and suppress twisting of the building 10 during an earthquake, etc.

In addition, in this embodiment, the girder surface 30A of the extension unit 18 and the girder surface of the building unit 16 are rotatably connected via a connecting portion 44. This allows only the vertical load due to the weight of the extension unit 18 to be transmitted to the structural surface (girder surface) of the building unit 16, and does not transmit any moment. This ensures the rigidity of the structural surface of the building unit 16, contributing to reducing the stress burden on the building 10. As a result, the durability of the building 10 can be improved.

In this embodiment, both the building unit 16 and the overhang unit 18 are formed in a rectangular box shape with four pillars 20, 24 erected at the four corners. The overhang unit 18 and the building unit 16 are arranged so that the joint surface 28C of the ceiling part and the joint surface 28F of the floor part of the girder surface of each other face each other. The building unit 16 and the overhang unit 18 are connected at the joint surfaces 28C and 28F. In other words, in the building 10 of this embodiment, the building unit 16 and the overhang unit 18 have the same specifications for the joint surface 28 and the same overall structure. This allows the components of both to be standardized, resulting in excellent productivity.

Second Embodiment
The extension unit 60 according to the second embodiment will be described below with reference to Figures 7 to 9. Note that the same components as those in the first embodiment described above are given the same reference numbers and the description thereof will be omitted.

As shown in FIG. 7, the extension unit 60 according to the second embodiment is characterized in that, on the girder surface 30B facing the outer periphery of the building 10, the ends of two columns 24 arranged on the girder surface 30B and the beam 26 connecting these columns 24 are joined together by means of rigid joints 42. The rest of the configuration is the same as in the first embodiment.

What is noteworthy about this embodiment is that the ends of the columns 24 and beams 26 that make up the girder surface 30B are joined together with rigid joints 42, thereby ensuring the rigidity of the girder surface 30B and improving the resistance of the extension unit 60 to vertical loads.

The above effects will be explained using the schematic diagrams of Figures 8 and 9. Figure 8 is a side view that shows a schematic diagram of the girder surface 30B of the extension unit 60 of this embodiment. Meanwhile, Figure 9 is a side view corresponding to Figure 8, showing an extension unit 200 as a comparative example.

In the comparative example shown in FIG. 9, the ends of two columns 220 arranged on a girder surface 210B facing the outer periphery of the building and a beam 230 connecting these columns 220 are joined by a pin joint 40. As shown in this figure, when a vertical load F2 is input to the girder surface 210B, a bending moment M300 acts on the beam 230 that constitutes the upper and lower parts of the girder surface 210B. In this case, since the beam 230 is a pin beam at both ends, the curve representing the bending moment M300 forms an arc that spans both ends of the beam 230 and gradually increases from both ends of the beam 230 to the middle part 230N. As a result, the stress is maximum at the middle part 230N of the beam 230.

On the other hand, in the projection unit 60 of this embodiment shown in FIG. 8, the ends of the columns 24 and beams 26 of the girder surface 30B are joined by the rigid joints 42, so that the bending moment M3 acts on the beams 26 that constitute the upper and lower parts of the girder surface 30B. In this case, since the beams 26 are fixed at both ends, there are two neutral axes 26N on the inside of both ends of the beams 26. The bending moment M3 gradually increases from the neutral axis 26N shown in FIG. 8 toward both ends and the middle part of the beam 26. Furthermore, the bending moment M4 also acts on the two columns 24 of the girder surface 30B. This bending moment M4 acts on the middle part 24N in the extension direction of each column 24 as a neutral axis, and gradually increases from the middle part 24N toward the upper end and lower end of the column 24. In this way, the stress of the girder surface 30B caused by the vertical load F2 is distributed to the columns 24 and beams 26. As a result, the amount of deflection of the beam 26 due to the vertical load F2 can be reduced, and the rigidity of the girder surface 30B against the vertical load can be ensured.

(Action and Effects)
The building 10 and the extension unit 60 configured as described above basically follow the configuration of the extension unit according to the first embodiment, and therefore can obtain the same functions and effects.

In addition, in the projection unit 60 of this embodiment, the two columns 24 and the beam 26 connecting these columns 24 are joined by rigid joints 42 on the other girder surface 30B facing the outer periphery of the building 10. This increases the rigidity of the other girder surface 30B facing the outer periphery of the building 10 against vertical loads. This increases the resistance of the girder surface 30B of the projection unit 60 against tip loads on the exterior wall (not shown) and roof of the projection unit 60, reducing the amount of deflection of the ceiling and floor. As a result, the degree of design freedom can be increased for the projection amount and specifications of the projection unit 60.

[supplementary explanation]
In the above-described embodiments, the pin joint 40 and the rigid joint 42 are formed only by welding, but the present invention is not limited to this. The pin joint and the rigid joint may be formed by fixing the web or flange of the beam to the joint surface of the column through a gusset.

In addition, in each of the above embodiments, the beam 26 is made of channel steel, but the present invention is not limited to this. For example, the beam of the extension unit may be made of L-shaped steel or H-shaped steel. In other words, it is sufficient that the beam has a web portion that extends vertically in a vertical cross-sectional view, and a flange portion that extends horizontally from at least one of the upper and lower ends of the web portion.

10. Building (unit building)
12 Building body 12B Upper floor portion 14 Building unit 18 Extension unit 20 Column 26 Beam 26A Web portion 26B Upper flange portion (flange portion)
26C Lower flange part (flange part)
28C Ceiling joint surface (joint surface)
28F Floor joint surface (joint surface)
30A Digit face (one side)
30B Digit surface (other digit surface)
32 Gable surface 40 Pin joint (pin joint)
42 Rigid joint (rigid joint)
44 Connection portion 60 Extension unit

Claims (3)

A rectangular box-shaped extension unit is connected to a building unit constituting an upper floor portion of a multi-story unit building, forms a protruding portion protruding from the upper floor portion, and has four columns erected at the four corners,
Two columns that are connected to the building unit and arranged on one girder surface that constitutes the structural surface on the long side are connected to a beam that connects the two columns by pin joints,
In a pair of gable faces arranged on both sides of the one girder face and constituting the structural face on the short side , two columns arranged on each of the pair of gable faces are rigidly connected to a beam connecting the two columns,
The protruding unit is arranged so that the girder surface of one of the girder surfaces faces the girder surface constituting the structural surface on the long side of the building unit, and the joint surfaces of the ceiling and floor of the one of the girder surfaces are connected to the joint surfaces of the ceiling and floor of the building unit arranged opposite each other via a plurality of connecting parts;
In the plurality of connecting portions, the one girder surface of the extension unit is configured to be rotatable around an axis in a girder direction of the extension unit relative to the girder surface of the building unit ,
On the other girder surface facing the outer periphery of the unit building, two columns arranged on the other girder surface and a beam connecting the two columns are rigidly connected.
Extension unit. The beam includes a web portion extending in a vertical direction in a vertical cross-sectional view, and a flange portion bent at a right angle from at least one of an upper end portion and a lower end portion of the web portion and extending in a horizontal direction,
the pin joint is formed by welding the web portion of the beam to the column;
The rigid connection is formed by welding the web portion and the flange portion of the beam to the column.
The extension unit according to claim 1 . A modular building having a multi-story building body,
A building unit that constitutes an upper floor portion of the building body and is formed in a rectangular box shape with four columns erected at the four corners;
The extension unit according to claim 1 or 2 ,
Unit building.