JP2003013538A - Roof frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a roof frame structure capable of easily realizing an inclined roof of complicated shape similarly to a wooden roof while using an aluminum extruded section having various characteristics as a framing member. SOLUTION: This roof frame structure comprises a strut raised on the roof truss beam of a roof, a hub member 8 mechanically bonded to the top part of the strut, a rafter 4 (angle rafter 5) having an end mechanically bonded to the hub member 8, and a purlin 6 mechanically bonded to the upper surface of the rafter 4 (angle rafter 5), and each of the strut, the rafter 4 (angle rafter 5) and the purlin 6 is formed of an aluminum alloy-made extruded section. The upper surface of the rafter 4 (angle rafter 5) and the upper and lower surfaces of the purlin 6 are formed in parallel to the flow face of the roof. Particularly, the upper surface of the angle rafter 5 is formed of two or more inclined surfaces 5a and 5a so as to be parallel to each of the flow faces crossing in the angle rafter 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sloping roof frame of a building.

[0002]

2. Description of the Related Art Sloped roofs of buildings come in various forms such as gables, dormitories, and purlins. Traditionally, these roof frames have generally been made of wood, and the ends of wooden frame members such as purlins, shed, timbers, purlins, and rafters are jointed into a complicated shape. It is composed by combining three-dimensionally. On the other hand, due to the recent revision from the specifications of the Building Standards Act to the performance regulations, it is made of an aluminum alloy that is light in weight for strength, resistant to corrosion, and easy to machine and unitize. There has been an attempt to use an extruded profile (hereinafter referred to as "aluminum extruded profile") as a frame material for a roof frame.

[0003]

However, a frame member made of an extruded aluminum frame can be cut into a complicated shape by cutting or piercing the end portion as in the case of a wooden structure. Can not. Therefore, for example, the part where the ridge of the hipped roof and the corner ridge meet, or the two gable roofs are seen in plan view L.
It is extremely difficult to realize a frame structure of a sloping roof that has a complicated shape part where multiple flow surfaces intersect three-dimensionally, such as a part that is orthogonally arranged in a letter shape, with a frame material made of aluminum extrusion Is.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an inclined roof having a complicated shape while using an aluminum extruded profile having various features as a frame member. The point is to propose a roof frame structure that can be easily realized as in the case of wooden structures.

[0005]

According to a first aspect of the present invention, there is provided a roof frame structure comprising: a shed bundle standing upright on a shed beam of a roof; and a hub member mechanically joined to the top of the shed bundle. It is characterized in that it includes a rafter mechanically joined to the hub member at an end thereof, and a purlin mechanically joined to an upper surface of each rafter, and each of the shed, the rafter, and the purlin is made of an aluminum extruded profile. .

In such a roof frame structure, the rafters are mechanically joined via the hub member fixed to the top of the shed, and the purlins are mechanically joined to the upper surface of the rafters, so the mountain line portion where a plurality of flow surfaces intersect with each other. Not only can the roof frame structure be a strong rafter hut in which the roof, valley line, peaks, and valley bottom are supported by a shed, but a complex arrangement in which the shed and a plurality of rafters intersect three-dimensionally Can be simplified, and the construction can be facilitated and the cost can be reduced. Also a shed,
Both the rafter and the purlin are made of extruded aluminum profiles, so they are lightweight for strength, resistant to corrosion, easy to process, and easy to unitize. Can be realized. In addition, since the hut bundle and the hub member, the hub member and the rafter, and the rafter and the purlin are all mechanically joined with bolts, rivets, etc., strength reduction and deformation of the frame member due to heat such as when welded can be avoided. It

The roof frame structure according to claim 2 of the present invention is
The roof frame structure according to claim 1, wherein an upper surface of the rafter and upper and lower surfaces of the purlin are formed parallel to a flow surface of the roof.

In such a roof frame structure, since the upper surface of the rafter and the lower surface of the purlin are formed parallel to the flow surface, the purlin can be easily attached to the rafter, and the upper surface of the purlin is also formed parallel to the flow surface. Since it is easy to attach a base plate, etc., it is possible to further facilitate construction and reduce costs.

A roof frame structure according to claim 3 of the present invention is
The roof frame structure according to claim 2, wherein the hub member has rafter joint arms, and the rafter has a hat-shaped cross section having downward opening grooves fitted to the rafter joint arms from above and flanges on both sides. , Is characterized.

According to such a roof frame structure, by fitting the downward opening groove of the rafter to the rafter joint arm of the hub member from above, the rafter can be easily positioned with respect to the hub member, and then the rafter is attached to the hub member by a drill screw or the like. Can be easily joined to. Further, by utilizing both flange portions of the rafter, it is possible to easily join the other member to the rafter and the rafter to the other member. Furthermore, since the rafter has a hat-shaped cross section, and drill screws can be installed from above or from the side of the rafter, it is possible to join the rafter to a hub member where many rafters join from a convenient direction. And workability is good. Since a bundle for supporting the rafter can be inserted into the downward opening groove of the rafter, the bundle can be easily attached.

The roof frame structure according to claim 4 of the present invention is
The roof frame structure according to any one of claims 1 to 3, further comprising a corner tree whose ends are mechanically joined to the hub member, and the purlin is mechanically joined to the upper surface of the corner tree, and the corner tree is made of aluminum. It is characterized by being made of an extruded profile.

In such a roof frame structure, not only rafters but also corners are mechanically joined to the shed by means of hub members, so that an extremely complicated shape where three or more flow surfaces intersect, such as a ridge roof, is formed. By simplifying the frame structure of the roof, the construction can be facilitated and the cost can be reduced.

A roof frame structure according to claim 5 of the present invention is
The roof frame structure according to claim 4 is characterized in that an upper surface of the corner tree is formed of a plurality of inclined surfaces so as to be parallel to respective flow surfaces intersecting in the corner tree.

In such a roof frame structure, since the upper surface of the corner tree is formed by a plurality of inclined surfaces so as to be parallel to the respective flow surfaces, it becomes easy to attach the purlin to the upper surface of the corner tree, and further construction is easy. And cost reduction.

A roof frame structure according to claim 6 of the present invention is
The roof frame structure according to claim 5, wherein the hub member includes a corner-tree joint arm, and the corner tree has a modified hat-shaped cross-section including a downward opening groove that is fitted into the corner-tree joint arm from above and flanges on both sides. There is a feature.

According to such a roof frame structure, by fitting the downward opening groove of the corner tree to the corner tree joining arm of the hub member from above, the positioning of the corner tree with respect to the hub member becomes easy, and then the corner tree is removed by a drill screw or the like. Can be easily joined to. Further, by utilizing both flange portions of the corner tree, it is possible to easily join the other member to the corner tree and the corner tree to the other member. Furthermore, since the corner tree has a hat-shaped cross section and drill screws can be installed from above or from the side of the corner tree, it is necessary to join the corner tree to the hub member where many rafters and corner trees join from a convenient direction. The workability is good. Since the bundle material for supporting the corner tree can be inserted into the downward opening groove of the corner tree, the bundle material can be easily attached.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description, the same elements will be denoted by the same reference symbols, without redundant description.

<First Embodiment> FIG. 1 is a perspective view for explaining a first embodiment of a roof frame structure according to the present invention. As shown in the figure, the main roof frame is a metal roof frame assembled on a wooden building T, and a shed beam 1 and a hut that are erected on the wooden girders Ta, Ta of the building T. Beam 1
A shed 2 erected in the middle of the shed 2, hub members 3 and 8 mechanically joined to the top of the shed 2 (see FIGS. 2 and 4), and rafters 4 whose ends are mechanically joined to the hub member 4. , A rafter 5, and a purlin 6 mechanically joined to the upper surfaces of the rafters 4 and the rafters 5. Here, all of the shed beams 1, shed bundles 2, rafters 4, corner trees 5, and purlins 6 are made of extruded aluminum profiles.

FIG. 2A is an enlarged perspective view of the portion A of FIG. 1, and FIG. 2B is an exploded view thereof. As shown in these figures, the ridge of the main roof frame is assembled around the hub member 3. The hub member 3 is formed by welding together a shed bundle joining arm 3a and rafter joining arms 3b and 3b made of iron square pipes in accordance with the shed shed 2 and the rafters 4 and 4 by welding. Bolt holes 3c are formed on both sides of the shed joint arm 3a and both sides of the rafter joint arm 3b, respectively.
Has been drilled.

The shed 2 is made of a hollow rectangular aluminum extruded material, and the shed joint arm 3a of the hub member 3 is inserted into the hollow portion from above. That is, the hollow portion of the shed 2 is of a size that allows the shed joint arm 3a to be inserted therein. Bolt holes 2a are formed on both sides of the shed 2 at positions corresponding to the bolt holes 3c of the shed joint arm 3a. The rafter 4 is an aluminum extruded shape member having a hat-shaped cross section that is open downward so that the ridge-side end of the rafter 4 covers the rafter joint arm 3b of the hub member 3 from above, and the rafter joint arm 3b has a bolt hole 3c. A bolt hole 4a is formed at a position corresponding to. Purlin 6
Is joined to the upper surface of the building T so as to be parallel to the girder Ta of the building T, that is, orthogonal to the rafter 4, and forms a roof substrate on which a ground plate (not shown) and the like are placed. Like the rafter 4, the purlin 6 is an extruded aluminum material having a hat-shaped cross section that opens downward, and has flange portions 6a protruding on both sides thereof.
6a.

Explaining the procedure for assembling such a ridge,
First, the hut bundle joining arm 3a of the hub member 3 is inserted into the hollow top portion of the shed bundle 2. Then, with the bolt hole 2a of the shed 2 and the bolt hole 3c of the shed joint arm 3a of the hub member 3 just matched, the bolt B is inserted through the bolt hole 2a and the bolt hole 3c and the nut N is fastened. By doing so, the hub member 3 can be easily joined to the top of the shed 2. In addition, from the viewpoint of efficiency of construction, it is desirable that the joining work of the hub member 3 to the shed 2 be performed in advance in a factory. Next, the downward opening groove 4 at the ridge-side end of the rafters 4, 4
c is put on the rafter joint arms 3b and 3b of the hub member 3 from above, and the bolt hole 4a of the rafter 4 and the rafter joint arm 3 of the hub member 3 are covered.
By aligning the rafter 4 so that the bolt holes 3c of b are aligned with each other, and in this state, the bolts B are inserted through the bolt holes 4a and the bolt holes 3c and the nuts N are fastened to the hub member 3. The rafters 4, 4 can be easily joined. In this state, the upper surface of the rafter 4 is parallel to the roof flow surface. Finally, the purlin 6 is placed on the upper surface of the rafter 4, the flange portion 6a of the purlin 6 and the top surface of the rafter 4 are joined with a drill screw S, and the purlin 6 is joined to the rafter 4. Then, at this time, the upper surface of the purlin 6 becomes parallel to the roof flow surface, so that a roof base material such as a ground plate can be further installed and well installed. Although the iron member square pipes are welded together to form the hub member 3, the present invention is not limited to this, and steel or aluminum alloy square pipes are welded together. It may be a cast iron or a cast aluminum alloy.

FIG. 3 (a) is an enlarged perspective view of portion B in FIG. 1, and FIG. 3 (b) is a plan view thereof. In addition, FIG.
FIG. As shown in these drawings, the confluence top of the main roof frame building and the corner building is assembled around the hub member 8. The hub member 8 is similar to the hub member 3 as well.
It has a shed joint arm 8a made of an iron square pipe, rafter joint arms 8b, 8b, 8b, and corner-tree joint arms 8c, 8c oriented along the directions of the corner trees 5, 5. Bolt holes 8d are formed on both side surfaces of the shed bundle joint arm 8a, both side surfaces of the rafter joint arm 8b, and both side surfaces of the corner timber joint arm 8c.

The corner tree 5 is an aluminum extruded shape member having a downward open cross-section such that the ridge side end portion covers the corner tree joining arm 8c of the hub member 8 from above, and the center of the upper horizontal portion of the rafter 4 is mountain-shaped. It has a deformed hat-shaped cross section that is formed by bending it into left and right inclined surfaces 5a, 5a. The left and right inclined surfaces 5a, 5a of the corner tree 5 are formed so as to be flush with the upper surfaces of the rafters 4, 4 on both sides when the rafter 4 and the corner tree 5 are joined to the hub member 8. That is, the upper surface of the corner tree 5 arranged along the mountain line where the two roof flow surfaces intersect is divided into the left and right inclined surfaces 5a, 5a, and the inclined surfaces 5a, 5a are parallel to the roof flow surfaces. Therefore, the purlin 6 to be joined to the upper surface of the rafter 4 can be easily joined to the upper surface of the corner tree 5 as it is, so that the storage can be simplified and the construction can be facilitated. The ridge-side end of the rafters 4 and the ridge-side of the corner trees 5 are arranged so that the ridge-side ends of the rafters 4, 4, 4 and the corner trees 5, 5 joined to the hub member 8 do not interfere with each other. The ends are appropriately cut off (see FIG. 3B). The joining manner between the hub member 8 and the corner tree 5 is similar to the joining manner between the hub member 3 and the rafter 4 described above, and the joining manner between the corner tree 5 and the purlin 6 is also the joining manner between the rafter 4 and the purlin 6 already described. According to the embodiment.

FIG. 5 (a) is an enlarged perspective view of portion C of FIG. As shown in the figure, the shed beam 1 is an aluminum extruded shape member having a hat-shaped cross section that is open upward, and the shed bundle 2 is a hollow prismatic aluminum extruded shape member. The lower end portion of the shed 2 is inserted into the upward opening groove 1a of the shed beam 1 from above.
Then, the bolt holes on both sides of the shed 2 and the corresponding bolt holes on both sides of the shed 1 are aligned and fixed with through bolts B and nuts N. When the hut girder 1 is made of wood instead of aluminum extruded shape, as shown in Fig. 5 (b), a U-shaped joint fitting 7 having an upward opening 7a is provided on the wooden hut girder 1 '. It is fixed with through bolts B and nuts N, the lower end of the shed 2 is inserted into the upward opening 7a of the fitting 7, and the positions of the bolt holes (not shown) formed on both sides of each are aligned. It may be fixed by the through bolt B and the nut N. The joining metal fitting 7 may be made of iron, aluminum alloy, or the like.

FIG. 6 is an enlarged perspective view of section D in FIG.
FIG. 7 is an exploded view of FIG. As shown in these figures,
The end of the shed beam 1 is fixed on the wooden beam Ta of the building T, and the eaves side end of the rafter 4 is joined to the shed beam 1 via the joining metal fitting 8. A bolt hole 1b is formed on the bottom of the girder side end of the shed beam 1.
And the girder side end of the shed beam 1 is cut so as to be parallel to the roof slope. Further, bolt holes 1c are formed on both sides of the girder side end of the shed beam 1. The joining metal fitting 8 is a metal fitting in the form of a hollow rectangular aluminum extruded material, and is cut so that its top portion is parallel to the roof flow surface. The width of the joint metal fitting 8 is just such that it can be inserted into the upward opening groove 1a of the shed beam 1 and the downward opening groove 4c of the rafter 4. Bolt holes 8 a and 8 b are formed on both side surfaces of the joint fitting 8. Bolt holes 4d are formed on both sides of the eaves side end of the rafter 4.

As an assembling procedure, first, the wood beam Ta is used.
The end portion of the hut girder 1 is placed on the upper surface of the hut, the bolt B is inserted through the bolt hole 1b, and the nut N is fastened to fix the hut girder 1 to the wooden beam Ta. Next, the lower part of the joint metal fitting 8 is inserted into the upward opening groove 1a of the shed beam 1, the bolt hole 1c and the bolt hole 8a are aligned, the through bolt B is inserted, and the nut N is fastened, whereby the shed The metal fitting 8 is fixed to the beam 1. Finally, the downward opening groove 4c of the rafter 4 is covered on the top of the joint fitting 8, the bolt hole 4d and the bolt hole 8b are aligned with each other, the through bolt B is inserted, and the nut N is fastened. Secure rafter 4 to. In this state, the lower surface of the upper side wall of the rafter 4 is brought into close contact with the top inclined surface of the joint fitting 8, and the lower surfaces of the both side flanges 4e, 4e of the rafter 4 contact the eaves side end inclined surface of the shed beam 1. I will come into contact with you. Of course, the upper surface of the rafter 4 is parallel to the roof flow surface.

<Second Embodiment> FIG. 8 is a perspective view for explaining a second embodiment of the roof frame structure according to the present invention. The building to which the roof frame structure of this embodiment is applied is a combination of an annex building T1 orthogonal to the building T of the first embodiment. The building T and the annex building T1 are assembled with hipped roofs having different building heights, respectively, and the two are joined to form a complicated sloping roof. Here, FIG.
8 is a perspective view of a portion E of FIG. 8, and FIG. 10 is an assembly exploded view thereof. As shown in these drawings, at the intersection of the wooden beam girder Tx of the building T and the wooden beam girder T1y of the auxiliary building T1, the lower chord member 10 and the upper chord member 11 of the truss group truss 9 of the building T, and the sloped valley line L1 of the roof. It has an extremely complicated frame structure that intersects with the valley corner tree 12 arranged along the road.

First, the lower chord member 10 of the truss 9 for the cottage is an extruded aluminum member having a hat-shaped cross section having an upward opening groove 10a. A bolt hole 10b is formed in the bottom portion of the girder side of the upward opening groove 10a of the lower chord member 10. The girder side end of the lower chord member 10 is placed on the upper surface of the wooden girder Tx, and a through bolt B having a length penetrating the wooden girder Tx is inserted from the bolt hole 10b to fasten the nut N. Lower chord material 1 at digit Tx
0 is fixed. Bolt holes 10c are formed on both sides of the girder side end of the lower chord member 10. Also, the lower chord material 10
The end portion of is cut and processed in parallel with the flow surface N1 so as to avoid interference with the valley corner tree 12 that three-dimensionally intersects it.

A fitting 13 is inserted into the upward opening groove 10a of the lower chord member 10. The joining metal fitting 13 joins the lower chord member 10 and the upper chord member 11 to each other, and includes a pair of substantially L-shaped side plate portions 13 a and 13 b and the side plate portions 13.
It is composed of a valley corner tree receiving portion 13c connecting a and 13b.
Bolt holes 13 are provided at the bottoms of the side plate portions 13a and 13b, respectively.
d is drilled, and bolt holes 13e are drilled in the upper portions of the side plate portions 13a and 13b, respectively. The joint fitting 13 is
Insert the lower part into the upward opening groove 10a of the lower chord member 10,
It is joined to the lower chord member 10 by aligning the bolt hole 13d with the bolt hole 10c, inserting the through bolt B therethrough, and fastening the nut N. At this time, the valley corner tree receiving portion 13c of the joining metal fitting 13 exactly matches the end portion of the lower chord member 10 that is obliquely cut and processed so as to avoid interference with the valley corner tree 12, and is parallel to the flow surface N1. Further, the tops of the pair of side plate portions 13a and 13b are also cut so as to be parallel to the flow surface N1.

A pair of side plate portions 13a, 13 of the joint fitting 13
The downward opening groove 11a of the upper chord member 11 of the roof truss 9 is covered on the top of b. The upper chord member 11 is an aluminum extruded shape member having a hat-shaped cross section having a downward opening groove 11a.
Bolt holes 11b are formed on both side surfaces of the eave side end of the upper chord member 11. Then, the downward opening groove 11a is covered on the tops of the pair of side plate portions 13a and 13b of the joint fitting 13, the upper chord member 11 is aligned so that the bolt holes 11b and the bolt holes 13e are aligned with each other, and the through bolt B is inserted there. By inserting and fastening the nut N, the upper chord material 11 is joined to the metal fitting 1
3 can be joined. Then, in this state, the upper surface of the upper chord member 11 is parallel to the flow surface N1.

The valley corner tree 12 is an extruded aluminum member having a modified hat-shaped cross section having a downward opening groove, and the upper surface thereof is divided into two at the center to form mountain-shaped inclined surfaces 12a and 12b. Then, both flanges of the valley corner tree 12 and the joint fitting 13
The valley corner tree receiving portion 13c is joined with a drill screw, and the valley corner tree 12 is joined to the joining metal fitting 13. 12 in this state
Of the inclined surface 12a is parallel to the flow surface N1.
b is parallel to the flow surface N2.

Next, FIG. 11 is a perspective view of portion F of FIG.
FIG. 12 is a plan view thereof. As shown in these figures,
The part where the flow surfaces N1, N2, N3 of the roof intersect and merge,
It has an extremely complicated frame structure in which the valley corner trees 12 and the mountain corner trees 14 cross over each other.

First, the mountain corner tree 14 is an extruded aluminum member having a modified hat-shaped cross section having a downward opening groove, and its upper surface is divided into two at the center to form valley-shaped inclined surfaces 14a and 14b. The mountain corner tree 14 is arranged along the inclined mountain line L2 of the roof, the inclined surface 14a is parallel to the flow surface N1, and the inclined surface 14b is parallel to the flow surface N3. Then, on the inclined surface 14b, the purlins 15a and 15b forming the flow surface N3 are formed.
Are joined. Further, a purlin 16a forming a flow surface N1 is joined to the inclined surface 14a of the mountain corner tree 14 at a position higher than the portion joined to the valley corner tree 12.

Further, the valley corner tree 12 is screwed to the flange 14c of the mountain corner tree 14. As described above, the valley corner tree 12 is an extruded aluminum member having a modified hat-shaped cross section having a downward opening groove, and the upper surface thereof is divided into two at the center to form mountain-shaped inclined surfaces 12a and 12b. Since the valley corner tree 12 has a bilaterally symmetrical cross section, if the flanges 12c and 12d are placed on the flange 14c of the mountain corner tree 14 as it is, the flow surface N1 becomes steep and the flow surface N2 becomes gentle. Therefore, by bending the flange 12c at the end of the valley corner tree 12 to form the bent portion 12e, the valley corner tree 12 is rotated slightly clockwise with respect to the mountain corner tree 14 (in FIG. 11, the valley corner tree 12 Are rotated so that the cross-sectional shape of the flow surface is inclined downward, and the gradients of the flow surface N1 and the flow surface N2 are equal. Therefore, Tani Sumiki 1
The second inclined surface 12a becomes parallel to the flow surface N1, and the purlin 16b can be bonded thereto in parallel to the flow surface N1.
Similarly, the inclined surface 12b of the valley corner tree 12 becomes parallel to the flow surface N2, and the purlin 17 can be joined thereto in parallel to the flow surface N2. Furthermore, in order to prevent the inclined surface 12b from protruding beyond the flow surface N2 at the end of the valley corner tree 12, a notch 12f having a triangular shape in plan view is formed at the end of the inclined surface 12b of the valley corner tree 12. There is. Therefore,
The end portion of the valley corner tree 12 does not project at the intersection of the sloped valley line L1, the sloped mountain line L2, and the horizontal valley line L3, so that the roof base material can be properly stored in that portion.

Although the embodiments of the roof frame structure according to the present invention have been described above, the present invention is not limited to these and should be appropriately modified and carried out according to the spirit of the invention. .

[0036]

As described above, according to the invention of claim 1, a strong rafter in which a mountain line portion, a valley line portion, a mountain peak portion and a valley bottom portion where a plurality of flow surfaces intersect are supported by a shed. Not only can a hut-type roof frame be constructed, but the complicated construction in which a shed and a plurality of rafters intersect three-dimensionally can be simplified, facilitating construction and reducing costs. . In addition, it is possible to realize a roof frame structure that maximizes the features of aluminum extruded profiles, which are light in weight for strength, resistant to corrosion, easy to process, and easy to unitize. In addition, since the hut bundle and the hub member, the hub member and the rafter, and the rafter and the purlin are all mechanically joined with bolts, rivets, etc., strength reduction and deformation of the frame member due to heat such as when welded can be avoided. It

According to the second aspect of the present invention, since the purlin can be easily attached to the rafter and the ground plate and the like can be easily attached to the purlin, further facilitation of construction and cost reduction can be achieved. it can.

According to the invention of claim 3, the rafter can be easily joined to the hub member, and by utilizing both flange portions of the rafter, the rafter is joined to the rafter or the rafter to the other member. Can be easily joined. Furthermore, the operation of joining the rafters to the hub member where a large number of rafters join can be performed from a convenient direction, and the attachment of the bundle can be facilitated.

According to the fourth aspect of the present invention, the structure of a roof having an extremely complicated shape where three or more flow surfaces intersect, such as a hipped roof, is simplified to facilitate construction and reduce costs. Can be planned.

According to the invention of claim 5, since the upper surface of the corner tree is formed of a plurality of inclined surfaces so as to be parallel to each flow surface, it becomes easy to attach the purlin to the upper surface of the corner tree. Further facilitation of construction and cost reduction can be achieved.

According to the invention of claim 6, the corner tree can be easily joined to the hub member, and by utilizing both flange portions of the corner tree, joining of the other member to the corner tree and the corner tree to the other member. Can be easily joined. Furthermore, the operation of joining the corners to the hub member where a large number of rafters and corners join can be performed from a convenient direction, and the attachment of the bundle can be facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a first embodiment of a roof frame structure according to the present invention.

2A is an enlarged perspective view of a portion A of FIG. 1, and FIG.
Is an assembly exploded view thereof.

3A is an enlarged perspective view of a B part in FIG. 1, and FIG.
Is a plan view thereof.

FIG. 4 is an exploded view of FIG. 3 (a).

5A is an enlarged perspective view of a C portion of FIG. 1, and FIG.
Are other examples.

FIG. 6 is an enlarged perspective view of a D part of FIG.

FIG. 7 is an exploded view of FIG.

FIG. 8 is a perspective view for explaining a second embodiment of the roof frame structure according to the present invention.

9 is an enlarged perspective view of a portion E of FIG.

10 is an exploded view of FIG. 9. FIG.

11 is an enlarged perspective view of an F portion of FIG.

FIG. 12 is a plan view of FIG. 11.

[Explanation of symbols]

T… Building Ta ... Wooden girder 1… Hut beam 2… Hut bundle 3 ... Hub member 4 ... rafters 5 ... Sumiki 6… Purlin 7… Joining metal fittings 8… Joining metal fittings 9… House truss 10… Upper chord material 11… Lower chord material 12… Tanisumi 13… Joining metal fittings 14 ... Yamasumi 15, 16, 17 ... Purlin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiromitsu Ishikawa             1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture             Nippon Light Metal Co., Ltd. Group Technology Center             Within (72) Inventor Hiroshi Horikawa             1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture             Nippon Light Metal Co., Ltd. Group Technology Center             Within (72) Inventor Kiyofumi Tanaka             1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture             Nippon Light Metal Co., Ltd. Group Technology Center             Within (72) Inventor Akio Matsunaga             1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture             Nippon Light Metal Co., Ltd. Group Technology Center             Within (72) Inventor Koichiro Mochizuki             1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture             Nippon Light Metal Co., Ltd. Group Technology Center             Within (72) Inventor Shuichi Ikeda             1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture             Nippon Light Metal Co., Ltd. Group Technology Center             Within

Claims (6)

[Claims] 1. A shed bundle standing upright on a shed beam of a roof,
A hub member mechanically joined to the top of the shed, a rafter mechanically joined to the hub member at an end, and a purlin mechanically joined to the upper surface of each rafter, the shed, rafter, purlin The roof frame structure is characterized in that both are made of extruded profiles made of aluminum alloy. 2. The roof frame structure according to claim 1, wherein an upper surface of the rafter and upper and lower surfaces of the purlin are formed parallel to a flow surface of the roof. 3. The hub member includes a rafter joint arm, and the rafter has a hat-shaped cross section including a downward opening groove that is fitted into the rafter joint arm from above and flanges on both sides. The roof frame structure according to claim 2. 4. The hub member includes a corner tree whose ends are mechanically joined, and the purlin is mechanically joined to an upper surface of the corner tree,
The roof frame structure according to any one of claims 1 to 3, wherein the corner wood is made of an extruded shape member made of an aluminum alloy. 5. The roof frame structure according to claim 4, wherein an upper surface of the corner tree is formed of a plurality of inclined surfaces so as to be parallel to respective flow surfaces intersecting with each other in the corner tree. 6. The deformed hat-shaped cross section, wherein the hub member includes a corner-tree connecting arm, and the corner tree includes a downward opening groove that is fitted into the corner-tree connecting arm from above and flanges on both sides. The roof frame structure according to claim 5, which is characterized.