JP7703465B2 - Unit joint hardware - Google Patents

Description

The present invention relates to a metal fitting for connecting units, and in particular to a metal fitting for connecting units that is attached to the outer peripheral surface of a hexahedral building unit that forms a building, and is used to connect a pair of adjacent building units to each other.

In recent years, for the purpose of shortening construction time and improving work efficiency for buildings such as residential buildings, there has been proposed a unit building constructed by transporting and assembling box-shaped building units that are prefabricated in a factory or the like into a hexahedron that is preferably small enough to fit in the bed of a large truck to the construction site. Various building units for forming such unit buildings have been developed (see, for example, Patent Documents 1 to 3).

The building units described in Patent Documents 1 to 3 are manufactured in advance in a factory or the like, then transported to the construction site by truck or the like, where they are preferably connected and assembled in the vertical and/or horizontal directions to form a load-bearing structure when constructing a building. However, in order to stably obtain the desired structural strength from multiple building units assembled in the vertical and horizontal directions, these multiple building units need to be joined together and integrated.

JP 2008-14055 A JP 2016-205022 A JP 2020-20178 A

For this reason, in conventional construction methods for constructing buildings using building units, multiple building units are installed in a vertical and horizontal direction at the building construction site, and then these connected building units are joined and integrated using various fixing joint metals. However, the current situation is that the task of integrating these building units in a precise and stable state using fixing joint metals so as to obtain the desired structural strength requires a lot of effort. For this reason, there is a need for the development of technology that allows building units that are assembled in a vertical and horizontal direction at the building construction site to be joined and integrated accurately and smoothly without requiring a lot of effort.

In particular, a construction method for constructing new buildings using building units has been proposed in which an existing unit building formed by assembling multiple building units is dismantled into individual building units, the multiple building units obtained by dismantling are then transported to another construction site, and the multiple building units transported are reassembled at the other construction site to reconstruct a new unit building. In order to efficiently carry out this construction method of reconstructing a new unit building using the multiple building units obtained by dismantling, there is a need for the development of technology that can smoothly release the connection between multiple integrated building units, or that can smoothly reconnect and integrate building units that have been installed adjacently.

The present invention aims to provide a metal unit for joining units that can be attached to the outer peripheral surface of a hexahedral building unit, smoothly joining and integrating adjacently installed building units, and smoothly releasing the joined state of integrated building units.

The present invention relates to a unit joining hardware that is attached to the outer peripheral surface of a hexahedral building unit that is connected together to form a building, and is used to join a pair of adjacent building units to each other. The hardware is comprised of a first joining hardware having an engaging recess, a second joining hardware having an engaging protrusion, and a fixing hardware that fixes the first joining hardware and the second joining hardware in an engaged state. The first joining hardware and the second joining hardware are attached to opposing positions on the opposing joint surfaces of the pair of building units, and the first joining hardware and the second joining hardware are each provided with a fixing locking hole that is arranged parallel to each other when engaged. The fixing hardware has a pair of fixing locking rod parts that are simultaneously inserted and locked into the fixing locking holes of the first connecting hardware and the second connecting hardware, and a connecting part that connects these fixing locking rod parts as one unit. The pair of adjacent building units is positioned by engaging the engaging protrusions of the second connecting hardware with the engaging recesses of the first connecting hardware, and the pair of fixing locking rod parts are simultaneously inserted and locked detachably into the fixing locking holes of the first connecting hardware and the second connecting hardware, thereby providing a unit connecting hardware that can be fixed in a state where the engaging protrusions of the second connecting hardware are engaged with the engaging recesses of the first connecting hardware. The above-mentioned objective has been achieved by providing a unit connecting hardware.

The unit joining hardware of the present invention preferably has an engaging recess of the first joining hardware having a recess-side alignment inclined surface, and an engaging protrusion of the second joining hardware having a protrusion-side alignment inclined surface.

Furthermore, it is preferable that the unit connecting hardware of the present invention has an engaging recess of the first connecting hardware that is a recess having a cross-sectional shape that is an isosceles trapezoid, a right-angled trapezoid, or an arc shape, and that the engaging protrusion of the second connecting hardware is a protrusion that has a similar cross-sectional shape that is an isosceles trapezoid, a right-angled trapezoid, or an arc shape.

Furthermore, it is preferable that the connecting portion of the fixing hardware of the unit joining hardware of the present invention is formed to be expandable and contractible.

Furthermore, it is preferable that the unit joining hardware of the present invention is attached to the outer peripheral surface of the side portion of the building unit having the hexahedral shape, and is used to join the pair of adjacent building units to each other in the left-right direction.

The unit joining hardware of the present invention is attached to the outer peripheral surface of a hexahedral building unit, allowing adjacently installed building units to be smoothly joined and integrated, and also allowing the joined state of integrated building units to be smoothly released.

FIG. 1 is a perspective view of an enlarged view of part A in FIG. 3, illustrating the use of a unit connecting metal fitting according to a preferred embodiment of the present invention. 2(a) and (b) are perspective views illustrating the configuration of a unit connecting metal fitting according to a preferred embodiment of the present invention. FIG. 3 is an explanatory diagram of a joint of wooden frame building units that are assembled in a row in the left-right direction, illustrating the mounting positions of unit joint hardware. FIG. 4 is a perspective view illustrating a plurality of building units joined together using unit joining hardware. FIG. 5 is a perspective view illustrating a state in which a plurality of building units are consecutively arranged and assembled in the vertical and horizontal directions. FIG. 6 is an explanatory diagram showing construction in which the upper and lower combinations of building units are changed. 7(a) to (c) are schematic cross-sectional views illustrating other forms of the engaging recess of the first metal joint and the engaging protrusion of the second metal joint.

The unit joint hardware 10 according to a preferred embodiment of the present invention, as illustrated in Figures 1 and 2(a) and (b), is used as a joint hardware for smoothly joining and integrating building units that are connected in series in the left-right direction, particularly when joining and assembling multiple building units 16 for frame construction, as illustrated in Figure 4, as a hexahedral building unit, preferably in the left-right and up-down directions and as a whole, to form a framework structure 30 for a wooden building using frame construction, as shown in Figure 5, for example.

In this embodiment, the building unit 16 is a building unit for frame construction that can form the framework structure 30 of a wooden building by frame construction, and has a hexahedral framework structure that forms the framework, which is made of structural column members 11 and structural beam members 12, 13. The building unit 16 for frame construction has considerable structural strength due to the use of structural column members 11 and structural beam members 12, and is a unit that can form even large-scale buildings. In addition, the building unit 16 is manufactured in advance in a factory or the like, and then transported to the construction site by truck or the like and assembled there, which makes it possible to efficiently build a building, and preferably, as described below, even when forming a large-scale building, the weight of the unit itself is suppressed from increasing, reducing the effort required for transportation and installation at the construction site, and sufficient shape-retaining rigidity is ensured so that distortion and deformation do not occur when lifted.

Furthermore, in this embodiment, preferably all of the building units 16 that make up the unit building are units with unified specifications, with the four corner structural column members 11 that form the building unit 16 and each of the four upper structural beam members 12 and lower structural beam members 13 having the same shape. This makes it possible, for example as shown in Figure 6, to dismantle an existing unit building, transport the dismantled building units 16 to another construction site, and reassemble the transported building units 16 to reconstruct a new unit building.

The unit connection hardware 10 of this embodiment has a function that allows efficient construction of such construction methods, particularly when an existing unit building formed by assembling multiple building units 16 is dismantled into individual building units 16, the multiple building units 16 obtained by dismantling are transported to another construction site, and the multiple building units 16 transported are reassembled at the other construction site to reconstruct a new unit building, by smoothly releasing the connection between multiple integrated building units and smoothly reconnecting and integrating adjacently installed building units.

The unit joining hardware 10 of this embodiment is a unit joining hardware that is attached to the outer peripheral surface of a hexahedral building unit 16 that is connected and assembled to form a building, and is used to join a pair of adjacent building units 16 to each other. As shown in Figures 1 and 2(a) and (b), the unit joining hardware 10 is composed of a first joining hardware 17 having an engaging recess 17a, a second joining hardware 18 having an engaging protrusion 18a, and a fixing hardware 19 that fixes the first joining hardware 17 and the second joining hardware 18 in an engaged state, and the first joining hardware 17 and the second joining hardware 18 are attached to opposing positions on the opposing joining surfaces of the pair of building units 16 (see Figure 1). The first joining metal 17 and the second joining metal 18 have fixing locking holes 17c, 18c drilled into each of the joining metals 17, 18 which are arranged parallel to each other when engaged, and the fixing metal 19 has a pair of fixing locking rod portions 19a which are simultaneously inserted and locked into the fixing locking holes 17c, 18c of the first joining metal 17 and the second joining metal 18, and a connecting portion 19b which connects these fixing locking rod portions 19a together. The pair of adjacent building units 16 are positioned by engaging the engaging protrusions 18a of the second connecting metal 18 with the engaging recesses 17a of the first connecting metal 17, and the pair of fixing locking rods 19a are simultaneously inserted and locked into the fixing locking holes 17c, 18c of the first connecting metal 17 and the second connecting metal 18 in a detachable manner, thereby allowing the first connecting metal 17 to be fixed in a state where the engaging protrusions 18a of the second connecting metal 18 are engaged with the engaging recesses 17a of the first connecting metal 17.

In addition, in this embodiment, the engaging recess 17a of the first connecting metal 17 preferably has a recess side alignment inclined surface 17b, and the engaging protrusion 18 of the second connecting metal preferably has a protrusion side alignment inclined surface 18b.

In this embodiment, the unit joining hardware 10 can be attached to predetermined positions of the upper structural beam member 12 and lower structural beam member 13 of the building unit 16, preferably in advance at a factory or the like, when the building unit 16 for frame construction is manufactured, thereby making it possible to more smoothly, efficiently, and easily join and integrate the adjacent building units 16 that are transported to the building construction site, particularly when assembling them in the left-right direction.

In this embodiment, as shown in Figs. 1 and 3, at least one of the upper structural beam members 12 and the lower structural beam members 13 that constitute the building unit 16 for the framework construction method, preferably on the outer peripheral side of the upper structural beam member 12, one of the first joint metal members 17 and the second joint metal members 18 of the unit joint metal members 10 is attached at four locations, preferably near the corners of the hexahedron shape of the pair of long side upper beam members 12a, as predetermined positions corresponding to the positions of the other joint metal members 17, 18 attached to the building unit 16 installed adjacent to the left and right.

Here, in this embodiment, the building unit 16 for the framework construction method is composed of four corner structural column members 11 arranged upright at each of the four corners of the hexahedron shape, four upper structural beam members 12 and lower structural beam members 13 arranged to connect these corner structural column members 11, a flat portion strength surface member 14 attached to close the upper surface of the hexahedron shape, and a side portion strength surface member 15 attached by joining the upper edge and the lower edge to the upper structural beam member 12 and the lower structural beam member 13, respectively, as shown in FIG. 4. The building unit 16 is formed to have a hexahedral frame shape that can be stacked on the bed of a truck, for example, and has a size equivalent to the height of one story of a building, for example, a length of about 600 to 700 cm, a width of about 180 to 250 cm, and a height of about 150 to 320 cm.

The corner structural column members 11 are made of wooden square timbers with a rectangular cross-sectional shape, including a square, measuring, for example, 105 to 180 mm in length and width, and have sufficient structural strength as frame members that form the framework of a building constructed using the post and beam method. The corner structural column members 11 are arranged vertically and parallel to each other at the four corners of the hexahedral building unit 16. The upper ends of these four corner structural column members 11 are connected to each other via four upper structural beam members 12, and the lower ends are connected to each other via four lower structural beam members 13, so that the corner structural column members 11, together with the four upper structural beam members 12 and the four lower structural beam members 13, form a strong hexahedral framework structure. Reinforcing or auxiliary studs 11' can also be attached as appropriate between each pair of adjacent corner structural column members 11. The studs 11' do not have to constitute structural column members.

The upper structural beam member 12 is made of a wooden square timber with a rectangular cross-sectional shape, for example, about 105 to 300 mm in length and width, and has sufficient structural strength as a framework member that forms the framework of a building using the post-and-beam construction method, together with the lower structural beam member 13, which is joined via the vertical joint metal 20 described later. The upper structural beam member 12 is made of a pair of long side upper beam members 12a arranged on the long side portion along the length direction of the hexahedron shape, and a pair of short side upper beam members 12b arranged on the short side portion along the width direction. A reinforcing or auxiliary intermediate beam 12b' can be appropriately attached between the pair of short side upper beam members 12b, preferably arranged parallel to the short side upper beam member 12b. The intermediate beam 12b' does not have to be a structural beam member. In this embodiment, the peripheral portion is joined to the side surface of the intermediate beam 12b' and the upper structural beam member 12, so that the planar load-bearing surface material 14 is attached in a divided state, closing off the upper surface of the hexahedral shape.

The lower structural beam member 13 is made of a wooden block having a rectangular cross section, including a square, with a length and width of, for example, about 90 to 120 mm. Together with the upper structural beam member 12 and the foundation (not shown), which are joined via the vertical joint metal fittings 20 described later, it has sufficient structural strength as a framework member that forms the framework of a building constructed using the post and beam method. The lower structural beam member 13 is made up of a pair of long side lower beam members 13a arranged on the long side portions along the length direction of the hexahedron shape, and a pair of short side lower beam members 13b arranged on the short side portions along the width direction. A reinforcing or auxiliary intermediate beam 13b' can be appropriately attached between the pair of short side lower beam members 13b, preferably arranged parallel to the short side lower beam members 13b. The intermediate beam 13b' does not have to be a structural beam member.

In this embodiment, the flat bearing surface material 14, which is attached to close the top surface of the hexahedral frame structure made up of the corner structural column members 11, the upper structural beam members 12, and the lower structural beam members 13, is provided in a divided state by joining the peripheral parts to the surrounding upper structural beam members 12 and intermediate beams 12b' as described above. The flat bearing surface material 14 is preferably made of cross-laminated timber (CLT) having a thickness of about 90 to 150 mm, for example. By making the flat bearing surface material 14 out of cross-laminated timber, it is possible to suppress deformation of the structural frame in the event of an earthquake, improve the aesthetic appearance as a ceiling finishing material, and suppress the spread of fire to the upper part in the event of a fire.

In this embodiment, the side surface strength panel 15 attached to at least one of the four sides of the hexahedral frame structure made of the corner structural column members 11, the upper structural beam members 12, and the lower structural beam members 13 is attached partially at one or two appropriate positions on the hexahedral side surface, preferably in an area surrounded by the upper structural beam members 12, the lower structural beam members 13, the corner structural column members 11, and the partition 11', with the upper and lower edges joined to the upper structural beam members 12 and the lower structural beam members 13, respectively, and preferably with the left and right side edges joined to the corner structural column members 11 and the partition 11', as shown in Figure 1. For the same reasons as the flat structural beam members 14, the side surface strength panel 15 is preferably made of orthogonal laminated boards. The flat surface strength panel 14 and the side surface strength panel 15 can be made from orthogonal laminated timber or other known strength panels such as structural plywood.

The building unit 16 for the frame construction method having the above-mentioned configuration is manufactured in advance in a factory or the like, and then transported to a construction site by a truck or the like, and assembled preferably in the vertical and horizontal directions at the construction site to form a framework structure 30 for forming a wooden building by the frame construction method, for example, as shown in FIG. 2. That is, the building unit 16 is lifted, for example, by a heavy lifting machine at the factory or the like and loaded onto a truck, and at the construction site to which it is transported, it is similarly lifted from the truck by a heavy lifting machine or the like and installed at a predetermined installation position. In this embodiment, the building unit 16 is a load-bearing structure using frame members, such as the corner structural column member 11, the upper structural beam member 12, and the lower structural beam member 13. Therefore, compared to the conventional building unit having a load-bearing structure using a load-bearing wall panel, it is possible to effectively suppress the increase in the weight of the unit itself, which would be caused by the need to increase the wall thickness of the panel, even when forming a large-scale building. This makes it possible to effectively reduce the effort required during transportation and installation at the construction site. In addition, by providing a flat surface strength member 14 and a side surface strength member 15 on part of the hexahedral shape, it is possible to ensure sufficient shape retention rigidity so that no distortion or deformation occurs when the structure is lifted.

Therefore, even when using such building units 16 to construct large-scale unit buildings using the post-and-beam construction method, it is possible to construct them stably and efficiently, and it is possible to ensure that the building units 16 have sufficient shape-retaining rigidity so that they do not warp or deform when hoisted during transportation or installation at the construction site.

In addition, in this embodiment, the building units 16 are integrated, particularly in a state where multiple units are connected together in the left-right direction, using unit connecting hardware 10, as described below, which makes it possible to more efficiently and easily form unit buildings, preferably using a frame construction method, or buildings that include such unit buildings in part.

Furthermore, in this embodiment, all of the building units 16 constituting a unit building using a frame construction method are preferably standardized in specifications so that the four corner structural column members 11 and the four upper structural beam members 12 and lower structural beam members 13 constituting the building units 16 have the same shape. As a result, as shown in FIG. 6, when the unit building is preferably dismantled and the multiple building units 16 are transported to another construction site and reassembled to reconstruct a new unit building, it becomes possible to easily construct a new unit building with a different arrangement of the building units 16, for example by swapping the building units 16 on the upper and lower floors, because the specifications of the building units 16 are standardized.

In this embodiment, the unit joining hardware 10 includes a first joining hardware 17, a second joining hardware 18, and a fixing hardware 19, as shown in Figures 2(a) and (b). The first joining hardware 17 is a thick metal plate member having a rectangular front shape measuring, for example, about 50 to 100 mm in length and width, and an engaging recess 17a, preferably having a horizontally elongated isosceles trapezoidal cross-sectional shape, is formed on the surface of the first joining hardware 17 facing the second joining hardware 18, so as to span a pair of long sides. Since the engaging recess 17a has a horizontally elongated isosceles trapezoidal cross-sectional shape, it is provided with recess-side alignment inclined surfaces 17b on both sides in the long side direction. A pair of fixing locking holes 17c for inserting and locking the fixing locking rod portion 19a of the fixing metal 19 are drilled and formed so as to penetrate between the pair of long side portions on the side end surface of the long side portion of the first joint metal 17, and are provided extending in parallel. The fixing locking holes 17c preferably have a circular hollow cross-sectional shape. In addition, the first joint metal 17 has a plurality of fixing screw holes (not shown) formed at appropriate positions, penetrating the front and back of the front portion. By driving fixing screws into these screw holes toward the outer peripheral side surface of the upper structural beam member 12, it is possible to firmly attach the first joint metal 17 to a predetermined position on the outer peripheral side surface of the upper structural beam member 12.

In this embodiment, the second joint metal 18 is also a thick metal plate member having a rectangular front shape with a length and width of about 50 to 100 mm, for example. On the surface of the second joint metal 18 facing the first joint metal 17, an engagement protrusion 18a, preferably having a horizontally elongated isosceles trapezoidal cross section, is formed across a pair of long side portions. Since the engagement protrusion 18a has a horizontally elongated isosceles trapezoidal cross section, it is provided with a protrusion side alignment inclined surface 18b on both sides in the long side direction. A pair of fixed locking holes 18c for inserting and locking the fixed locking rod portion 19a of the fixed metal 19 are drilled and formed so as to penetrate between the pair of long side portions and extend in parallel. The fixed locking holes 18c preferably have a circular hollow cross section. In addition, the second joint metal 18 has multiple screw holes (not shown) for fixing formed at appropriate positions that penetrate the front and back of the front part. By driving fixing screws into these screw holes toward the outer peripheral side surface of the upper structural beam member 12, it becomes possible to firmly attach the second joint metal 18 to a predetermined position on the outer peripheral side surface of the upper structural beam member 12.

In this embodiment, the fixing hardware 19 that fixes the first connecting hardware 17 and the second connecting hardware 18 in an engaged state is made of a metallic material and is composed of a pair of fixing locking rod portions 19a that are simultaneously inserted and locked into both the fixing locking hole 17c of the first connecting hardware 17 and the fixing locking hole 18c of the second connecting hardware 18, and a connecting portion 19b that connects one end of the pair of fixing locking rod portions 19a together. The pair of fixed locking rods 19a are preferably inserted and locked into the pair of fixed locking holes 17c, 18c of the first connecting metal 17, 18 attached to the upper structural beam member 12 of one adjacent building unit 16, preferably with the engaging protrusion 18a fitted into the engaging recess 17a, so that the first connecting metal 17 attached to the upper structural beam member 12 of the other building unit 16 is overlapped, preferably in close contact with the second connecting metal 18 attached to the upper structural beam member 12 of the other building unit 16, and the fixing metal 19 can fix the first connecting metal 17 and the second connecting metal 18 in an engaged state. This allows the fixing metal 19 to firmly maintain the overlapping state of the first connecting metal 17 and the second connecting metal 18 via the connecting portion 19b, and also allows the adjacent building units 16 to which the connecting metals 17, 18 are attached to be easily connected as a whole.

In addition, according to this embodiment, the engaging recess 17a of the first connecting metal 17 has recess-side alignment inclined surfaces 17b on both sides of the horizontally elongated isosceles trapezoidal cross-sectional shape, and the engaging protrusion 18a of the second connecting metal 18 has protrusion-side alignment inclined surfaces 18b on both sides of the horizontally elongated isosceles trapezoidal cross-sectional shape. By rubbing these alignment inclined surfaces 18b together, when installing one building unit 16 adjacent to the side of the other adjacent building unit 16, it becomes possible to easily position the other building unit 16.

Furthermore, in this embodiment, the fixing hardware 19 of the unit connecting hardware 10 can be preferably formed to be expandable by configuring the connecting portion 19b with, for example, a cap nut integrally joined to one end of one fixed locking rod 19a and a male threaded bolt integrally joined to one end of the other fixed locking rod 19a, and screwing the male threaded bolt into the cap nut. As a result, when positioning one adjacent building unit 16 on the other building unit 16 by overlapping the second connecting hardware 18 on the first connecting hardware 17, even if there is an error in the building units 16 and the connecting hardware 17, 18 cannot be overlapped with precision and the positions of the fixing locking holes 17c, 18c are misaligned relative to each other, these errors can be absorbed by expanding and contracting, making it possible to insert and lock the pair of fixing locking rod portions 19a into the respective fixing locking holes 17c, 18c, and the pair of adjacent building units 16 can be joined together in a stable state by the fixing hardware 19.

The unit joining hardware 10 of this embodiment, which has the above-mentioned configuration, is attached to the outer peripheral surface of the hexahedral building unit 16, making it possible to smoothly join and integrate the adjacently installed building units 16, and also to smoothly release the joined state of the integrated building units 16.

That is, the unit joining hardware 10 of this embodiment is configured to include a first joining hardware 17 having an engaging recess 17a, a second joining hardware 18 having an engaging protrusion 18a, and a fixing hardware 19 that fixes the first joining hardware 17 and the second joining hardware 18 in an engaged state, and the first joining hardware 17 and the second joining hardware 18 are used by being attached to opposing positions on the opposing joining surfaces of a pair of building units 16, so that the engaging recess 17a of the first joining hardware 17 is preferably fixed to the fixing hardware 19 of the second joining hardware 18. After positioning a pair of adjacent building units 16 by engaging the engaging protrusions 18a, the pair of fixing locking rods 19a are simultaneously inserted and locked into the fixing locking holes 17c, 18c of the first connecting metal 17 and the second connecting metal 18, respectively. This makes it possible to easily fix the first connecting metal 17 in a state where the engaging protrusions 18a of the second connecting metal 18 are engaged with the engaging recesses 17a of the first connecting metal 17, thereby making it possible to smoothly join and integrate the adjacently installed building units 16.

The pair of fixing locking rod portions 19a of the fixing hardware 19 are simultaneously inserted and locked in the fixing locking holes 17c, 18c of the first connecting hardware 17 and the second connecting hardware 18 in a detachable manner. For example, by pulling out the inserted fixing locking rod portions 19a from the fixing locking holes 17c, 18c, the locking state by the fixing hardware 19 can be easily released, and the first connecting hardware 17 and the second connecting hardware 18 can be released, so that the connection state of the building unit 16 that has been positioned and integrated can be smoothly released.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, the building unit to which the unit connecting hardware of the present invention is attached and joined does not necessarily have to be a building unit for a framework construction method using framework members made of structural column members or structural beam members, and may be a building unit made of a wall panel using a planar structural panel member made of orthogonal laminated timber, etc. It may also be a building unit having a hexahedral shape other than that made of wood. The outer peripheral surface portion of the building unit to which the unit connecting hardware is attached does not necessarily have to be the outer peripheral surface portion of the side portion of the building unit having a hexahedral shape, and it can be attached to the outer peripheral surface portion of the upper surface or lower surface and used as a connecting hardware for joining a pair of building units that are stacked and assembled to each other in the vertical direction.

In addition, the engaging recess of the first connecting metal and the engaging protrusion of the second connecting metal do not necessarily have to have an isosceles trapezoidal cross-sectional shape, and may have a right-angled trapezoidal or arc-shaped cross-sectional shape, for example, as shown in Figures 7(a) and (b). The recess-side alignment inclined surface and the protrusion-side alignment inclined surface may be curved inclined surfaces. For example, as shown in Figure 7(c), the engaging recess and engaging protrusion may have a rectangular cross-sectional shape without an alignment inclined surface.

10 Unit joint metal fitting 11 Structural column member 11' Partition 12 Upper structural beam member 12a Long side upper beam member 12b Short side upper beam member 12b' Intermediate beam 13 Lower structural beam member 13a Long side lower beam member 13b Short side lower beam member 13b' Intermediate beam 14 Planar portion strength-bearing surface material 15 Side portion strength-bearing surface material 16 Building unit 17 First joint metal fitting 17a Engagement recess 17b Recess side alignment inclined surface 17c Fixed locking hole 18 Second joint metal fitting 18a Engagement protrusion 18b Protrusion side alignment inclined surface 18c Fixed locking hole 19 Fixed metal fitting 19a Fixed locking rod 19b Connection portion

Claims (5)

A unit connecting hardware is attached to the outer peripheral surface of a hexahedral building unit that is connected and assembled to form a building, and is used to connect a pair of adjacent building units to each other,
The joint includes a first joint metal having an engaging recess, a second joint metal having an engaging protrusion, and a fixing metal that fixes the first joint metal and the second joint metal in an engaged state,
The first joint metal fitting and the second joint metal fitting are used by being attached to opposing positions on opposing joint surfaces of the pair of building units,
The first and second joint metals have fixing locking holes drilled therein that are arranged parallel to each other when engaged, and the fixing metal has a pair of fixing locking rod portions that are simultaneously inserted and locked into the fixing locking holes of the first and second joint metals, and a connecting portion that connects these fixing locking rod portions together,
A unit connecting hardware that positions a pair of adjacent building units by engaging the engaging protrusions of the second connecting hardware with the engaging recesses of the first connecting hardware, and can fix the pair of building units by simultaneously inserting and engaging a pair of fixing locking rod portions into the fixing locking holes of the first connecting hardware and the second connecting hardware in a removably manner, thereby engaging the engaging protrusions of the second connecting hardware with the engaging recesses of the first connecting hardware. The unit joining hardware according to claim 1, wherein the engaging recess of the first joining hardware has a recess-side alignment inclined surface, and the engaging protrusion of the second joining hardware has a protrusion-side alignment inclined surface. The unit connecting hardware according to claim 2, wherein the engaging recess of the first connecting hardware is a recess having a cross-sectional shape that is an isosceles trapezoid, a right-angled trapezoid, or a circular arc, and the engaging protrusion of the second connecting hardware is a protrusion having a similar cross-sectional shape that is an isosceles trapezoid, a right-angled trapezoid, or a circular arc. The unit connecting hardware according to any one of claims 1 to 3, wherein the connecting portion of the fixing hardware is formed to be expandable. The unit joining hardware according to any one of claims 1 to 4 is attached to the outer peripheral surface of the side of the building unit having the hexahedral shape and is used to join the pair of adjacent building units in the left-right direction.