Simple building

Abstract

To provide a simple building which satisfies a prescribed strength, which has a low roof, and which has preferable design property.SOLUTION: A simple building comprises beams 1a, 1b, rafters 2, 3, a roof material 4, and a column 5. The beams 1a, 1b include a main body portion 7 comprising a hollow portion 6 and a gutter portion 8 provided at an inner peripheral side of the main body portion 7. The column 5 straddles a lower face 7a of the main body portion 7 and a lower face 8a of the gutter portion 8 of the beams 1a, 1b to be in contact with and support the beams 1a, 1b. End portions of the rafters 2, 3 in a longer direction are fixed to the inner peripheral side of the main body portion 7 of the beams 1a, 1b. The roof material 4 is attached the rafters 2, 3. The rafters 2, 3 and the roof material 4 are within a vertical dimension H of the beams 1a, 1b.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to simple buildings such as passage shelters and carports. [Background technology]

[0002] Conventional simple buildings have large roof heights (the vertical dimensions of the roof itself) due to the large vertical dimensions of the roof girders (see, for example, Non-Patent Document 1), and there was a demand for simple buildings that could achieve a specified strength without using large components. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Sankyo Tateyama Aluminum Co., Ltd., "Sankyo Tateyama Aluminum Public Exterior General Catalog 2008→2009" (Catalog No. STX0240E), October 2008, pp. 154-155 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above-mentioned circumstances, the present invention aims to provide a simple building that satisfies a predetermined strength, has a low roof height, and is excellent in design. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, the simple building according to the invention described in claim 1 comprises a girder, rafters, roof material, and pillars, the girder having a main body portion consisting of a hollow portion and a gutter portion provided on the inner periphery of the main body portion, the pillars abutting across the underside of the main body portion of the girder and the underside of the gutter portion to support the girder, the longitudinal ends of the rafters are fixed to the inner periphery of the main body portion of the girder, the roof material is attached to the rafters, and the rafters and roof material are contained within the vertical dimensions of the girder. [Effects of the Invention]

[0006] The simple building according to the invention of claim 1 has a main body made of a hollow part in the girder and a gutter part provided on the inner periphery of the main body, and the longitudinal ends of the rafters are fixed to the inner periphery of the main body of the girder, which allows the roof height to be lowered while ensuring a predetermined strength, and since the rafters and roof material are contained within the vertical dimensions of the girder, they are hidden by the girder, making for a good design.In addition, since the pillars abut across the underside of the main body of the girder and the underside of the gutter, water can easily flow from the girder's gutter to the pillars. [Brief explanation of the drawings]

[0007] [Figure 1] 5 is a cross-sectional view taken along the line AA in FIG. 4. [Figure 2] 5 is a cross-sectional view of FIG. 4 taken along line B-B. [Figure 3] 2 is a cross-sectional view taken along CC in FIG. 1. [Figure 4] 1 is a perspective view showing a first embodiment of a simple building according to the present invention. [Figure 5-1] FIG. 2 is a perspective view showing the construction procedure of the simple building of the first embodiment. [Figure 5-2] FIG. 5 is a perspective view showing the construction procedure of the simple building of the first embodiment (continuation of FIG. 5-1). [Figure 6] FIG. 10 is a perspective view showing the state when installing the rafters and end rafters. [Figure 7] FIG. 10 is a perspective view showing the state when the water stop plate is attached. [Figure 8] This is a perspective view showing the state when installing the gable. [Figure 9] FIG. 10 is a perspective view showing a state when the panel holder is attached. [Figure 10] FIG. 15 is a cross-sectional view taken along the line DD in FIG. [Figure 11] 15 is a cross-sectional view of FIG. 14 taken along the line E-E. [Figure 12] FIG. 11 is a cross-sectional view of FIG. 10 taken along the line F-F. [Figure 13] FIG. 1(a) is a front view showing a second embodiment of the simple building according to the present invention, and FIG. 1(b) is a side view of the same. [Figure 14] FIG. 10 is a plan view of the simple building of the second embodiment. [Figure 15-1] FIG. 10 is a perspective view showing the construction procedure of the simple building of the second embodiment. [Figure 15-2] FIG. 15-1 is a perspective view showing the construction procedure of the simple building of the second embodiment (continuation of FIG. 15-1). DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 9 show a first embodiment of a simple building according to the present invention. The simple building of this embodiment is applied to a passage shelter, and as shown in Figure 4, it has four pillars 5 erected at intervals in the front-to-back and left-to-right directions, and a roof 10 supported on the pillars 5. The roof 10 comprises girders 1a, 1b arranged on both the left and right sides, end gables 11 connecting the front and rear ends of the left and right girders 1a, 1b, end rafters 3 and rafters 2 erected at a distance in the front-to-back direction between the left and right girders 1a, 1b, and roof panels 4 attached between the end rafters 3 and rafters 2. The left and right girders 1a, 1b and the front and rear end gables 11 are arranged horizontally, so that the roof 10 appears horizontal and flat when viewed from the surrounding area.

[0009] The girders 1a and 1b are formed from extruded aluminum alloy profiles, and as shown in Figure 1, have a main body 7 consisting of a hollow portion 6 with an approximately rectangular cross section, and a gutter portion 8 provided on the inner side of the roof frame of the main body 7 (hereinafter simply referred to as the "inner side"). On the underside 7a of the main body 7, there are formed along the longitudinal direction of the girders 1a, 1b a connecting hardware storage groove 13 that receives the connecting hardware 12 attached to the upper end of the column 5, and a back plate holding groove 16 that holds a back plate 15 that is fixed to the connecting hardware 13 with bolts 14. The girders 1a, 1b are fixed to the column 5 by the main body 7 via the connecting hardware 12, back plate 15, and bolts 14. The gutter section 8 is formed by an inner peripheral side wall 17, a bottom wall 18, and an outer peripheral side wall 19, forming a groove shape with a roughly U-shaped cross section that is open at the top. The outer peripheral side wall 19 also serves as the inner peripheral side wall of the main body 7, and the underside 8a of the gutter section 8 is on the same plane as the underside 7a of the main body 7. The upper part of the inner peripheral side wall 17 is bent inward in a crank shape, and connecting walls 20 are provided on the upper end of the inner peripheral side wall 17 in the left-right direction. A rafter mounting section 21 is provided at a higher position on the inner peripheral end of the connecting wall 20, and a mounting section 23 for a panel retainer 22 is provided on the outer peripheral end of the connecting wall 20. The rafter mounting section 21 is located at a height approximately half the vertical dimension H of the girders 1a, 1b from the underside of the girders 1a, 1b. The bottom wall 18 extends further inward than the inner peripheral side wall 17, and has a receiving portion 24 for the rafters 2 and the end rafters 3 at its inner peripheral end. A hole is formed in the bottom wall 18 to drain rainwater that has accumulated in the gutter portion 8, and a drain 25 is attached to the hole.

[0010] In conventional simple buildings (see, for example, Non-Patent Document 1), gutters were provided on the outer periphery of the main body of the girder, and the longitudinal ends of the rafters were attached to the top surface of the main body of the girder, which resulted in a high roof height. This simple building has a main body 7 consisting of a hollow section 6 on the outer periphery of the girders 1a and 1b, a gutter section 8 on the inner periphery of the main body 7, and a rafter mounting section 21 on the inner periphery of the gutter section 8, which allows the vertical dimension H of the girders 1a and 1b to be reduced while maintaining a predetermined strength. Specifically, the vertical dimension H of the girders 1a and 1b is set to 120 mm. By reducing the vertical dimension H of the girders 1a and 1b, the height of the roof 10 can also be kept low. By locating the gutter section 8 on the inner periphery of the main body 7, the gutter section 8 is inconspicuous, resulting in a good design.

[0011] As shown in Figures 1 and 2, waterstops 27 are attached to the front and rear end faces of the left and right girders 1a, 1b with screws 28. The waterstops 28 have a height from the underside of the girders 1a, 1b that is approximately half the vertical dimension H of the girders 1a, 1b, and close the opening of the gutter section 8. A sealer 29 is interposed between the end faces of the girders 1a, 1b and the waterstops 27. Furthermore, as shown in Figure 7, the waterstops 27 are long members that are attached across the end faces of the left and right girders 1a, 1b. As shown in Figure 2, gables 11 are attached to the front and rear of the waterstop 27. The gables 11 are formed from extruded aluminum alloy profiles, and their height is approximately the same as the height H of the girders 1a and 1b. The gables 11 are attached to the left and right girders 1a and 1b with screws 30, and are also fixed to the end rafters 3 from the inside with screws 31.

[0012] As shown in Figure 2, the end rafters 3 and rafters 2 are formed from aluminum alloy extrusions in a hollow shape with a roughly rectangular cross section. Furthermore, as shown in Figure 1, the end rafters 3 and rafters 2 are curved in a bow shape so that the longitudinal center portion rises upward, and the longitudinal ends are cut out below the upper wall 32 of the hollow portion, and the ends of the upper wall 32 are placed on the rafter mounting portions 21 of the girders 1a and 1b and fixed in place with screws 33 from above. By cutting out the longitudinal ends in this way, the end rafters 3 and rafters 2 can be positioned at a low position, and the end rafters 3, 2, and roof panel 4 fit within the vertical dimension H of the lowered girders 1a and 1b.

[0013] The roof panel 4 is formed by cutting a resin panel into a rectangle, and as shown in Figures 1 and 2, the front and rear edges are placed on the top of the end rafters 3 or rafters 2 and are held down by panel holders 35 attached to the end rafters 3 and rafters 2 from above with screws 34, and the left and right edges are held down by panel holders 22 attached to the beams 1a and 1b.

[0014] As shown in Fig. 1, the column 5 supports the girders 1a and 1b by abutting across the undersides 7a of the main body portions 7 and the undersides 8a of the gutter portions 8 of the girders 1a and 1b. As shown in Fig. 3, the column 5 comprises a column main body 36, column covers 37, 37 attached to the front and rear sides of the column main body 36, and a batten 38 for hiding the screws 42 attaching the column cover 37 to the column main body 36. The column body 36 is formed from an extruded aluminum alloy member, and is a hollow member with a substantially T-shaped cross section in which an inner peripheral side portion 36a is thinner than an outer peripheral side portion 36b. The column cover 37 is formed from an extruded aluminum alloy profile and is attached to the narrowed space on the inner periphery of the column body 36, with its outer wall 39 being flush with the outer periphery side 36b of the column body 36. The column cover 37 has its outer edge engaged in a groove 40 formed in the column body 36, and its inner periphery is attached to the column body 36 with screws 42. The column cover 37 has a hollow portion 41, and the hollow portion 41 of one of the front and rear column covers 37, 37 (the front column cover 37 in the illustration) communicates with the gutter portions 8 of the girders 1a, 1b via the drain 25, and this hollow portion 41 also serves as a downspout to drain rainwater from the roof. Rainwater that falls on the roof 10 flows down the curved roof panel 4 into the gutter section 8 of the girders 1a and 1b, as shown by arrow 43 in Figure 1, and then flows from the gutter section 8 through the drain 25 into the hollow section 41 of the column cover 37, as shown by arrow 44, and is drained to the outside from the lower end of the column cover 37.

[0015] In this simple building, the columns 5 support the girders 1a and 1b by abutting across the undersides 7a of the main body 7 of the girders 1a and 1b and the undersides 8a of the gutter 8, allowing rainwater to flow directly from the gutter 8 to the columns 5 (more specifically, the hollow portions 41 of the column covers 37). Furthermore, the abutment surfaces of the main body 7 of the girders 1a and 1b with the columns 5 (the undersides 7a of the main body 7) and the abutment surfaces of the gutter 8 with the columns 5 (the undersides 8a of the gutter 8) are on the same plane. This allows the vertical dimension H of the girders 1a and 1b to be reduced, and when viewed from below, there is no boundary between the main body 7 and the gutter 8, giving the girders 1a and 1b a clean appearance. Furthermore, the columns 5 can be easily processed because the upper ends of the columns 5 only need to be cut straight. Furthermore, the column covers 37 also function as downspouts, eliminating the need for the downspouts typically made of round PVC pipes attached along the columns, resulting in a favorable design.

[0016] Next, the construction procedure for this simple building will be explained. First, the fixing members 45 are fixed to the upper ends of the column bodies 36 with screws 46 (see Figures 1 and 2), and the connecting members 12 are fixed to the top surfaces of the fixing members 45 with bolts 47. Next, the four column bodies 36 with the connecting members 12 attached are erected in predetermined positions on the ground. After that, as shown in Figure 5-1(a), girders 1a and 1b are placed across the front and rear column bodies 36, and the back plates 15 held in the back plate holding grooves 16 of the girders 1a and 1b are fixed to the connecting members 12 with bolts 14, connecting the column bodies 36 and the girders 1a and 1b. Next, as shown in FIG. 5-1(b), the pole cover 37 is attached to the pole body 36. Next, as shown in Figure 5-1(c), the end rafters 3 and rafters 2 are erected between the left and right girders 1a and 1b. As shown in Figure 6, the end portions of the end rafters 3 and rafters 2 are cut out in advance, leaving only the portion of the upper wall 32 that will support the roof panel 4. The remaining upper wall 32 is placed on the rafter mounting parts 21 of the girders 1a and 1b with a sealant 48 in between, and fixed in place with screws 33 from above. Next, as shown in FIG. 5-2(d) and FIGS. 7 and 8, the waterstop 27 and the gable 11 are attached across the front and rear end faces of the left and right beams 1a and 1b. Next, as shown in Figures 5-2(e) and 9, the roof panel 4 is placed on the gable rafters 3 and rafters 2, and panel holders 22, 35 are attached to the beams 1a, 1b and the gable rafters 3 and rafters 2 to secure the roof panel 4.

[0017] 10 to 15 show a second embodiment of the simple building of the present invention. This simple building is applied to a carport, and uses folded plates 9 as the roof material. As shown in FIGS. 13 and 14, this simple building comprises four pillars 5 erected at intervals in the front-to-back and left-to-right directions, and a roof 10 supported on the pillars 5. The roof 10 comprises girders 1a, 1b arranged on both the left and right sides, end gables 11 connecting the front and rear ends of the left and right girders 1a, 1b, end rafters 3 and rafters 2 erected at a distance in the front-to-rear direction between the left and right girders 1a, 1b, and folded plates 9 attached between the end rafters 3 and rafters 2. The left and right girders 1a, 1b and the front and rear end gables 11 are arranged horizontally as in the first embodiment, and the roof 10 appears horizontal and flat when viewed from the surrounding area.

[0018] The left and right girders 1a, 1b are made of extruded aluminum alloy profiles, and as shown in Figure 10, have a main body 7 consisting of two hollow sections 6a, 6b with approximately rectangular cross sections stacked one on top of the other, and a gutter section 8 provided on the inner periphery of the main body 7. A bolt rail storage groove 51 for storing a bolt rail 50 holding a bolt 49 projecting downward is formed on the underside 7a of the main body 7 along the longitudinal direction of the girders 1a, 1b. The gutter 8 is formed into a groove shape with a generally U-shaped cross section that is open at the top, with an inner peripheral side wall 17, a bottom wall 18, and an outer peripheral side wall 19. The outer peripheral side wall 19 also serves as the inner peripheral side wall of the main body 7, and the underside 8a of the gutter 8 is flush with the underside 7a of the main body 7. A bolt rail storage groove 51 is also formed in the underside 8a of the gutter 8 along the longitudinal direction. The upper ends of the outer peripheral side wall 19 and inner peripheral side wall 17 of the gutter section 8 are provided with support portions 52a, 52b on which the longitudinal ends of the end rafters 3 and rafters 2 rest. The depth of the gutter section 8 differs between the left and right girders 1a, 1b. The gutter section 8 of the right girder 1b in FIG. 1 is deeper than that of the left girder 1a, and the height of the support portions 52a, 52b of the right girder 1b is higher than that of the left girder 1a. Therefore, the end rafters 3 and rafters 2, which are erected between the left and right girders 1a, 1b with their longitudinal ends resting on the support portions 52a, 52b of the left and right girders 1a, 1b, are slightly inclined so that the right side is slightly higher. A hole is formed in the bottom wall 18 of the gutter section 8 to drain rainwater accumulated in the gutter section 8, and a drain 25 is attached to the hole.

[0019] In this way, the girders 1a and 1b have a main body 7 consisting of hollow portions 6a and 6b on the outer periphery, a gutter portion 8 on the inner periphery of the main body 7, and the longitudinal ends of the end rafters 3 and rafters 2 attached to the inner periphery of the main body 7, so that the vertical dimension H of the girders 1a and 1b can be made lower than when the gutter portion 8 is provided on the outer periphery of the main body 7. Specifically, the vertical dimension H of the girders 1a and 1b is 180 mm, which is higher than that of the first embodiment due to the thicker roof material.

[0020] As shown in Figure 11, the end rafters 3 and rafters 2 are formed from extruded aluminum alloy profiles in a hollow shape with a roughly rectangular cross section. The end rafters 3 and rafters 2 have bottom walls 53 that protrude laterally, and this protruding portion is placed on a mounting portion 52a that protrudes from the outer peripheral side wall 19 of the gutter portion 8 of the girders 1a and 1b, as shown in Figure 10, and is fixed from above with screws 54.

[0021] As shown in Fig. 11, the folded plate 9 is formed by bending a steel plate to have peaks 55 and valleys 56 alternately arranged in the front-to-rear direction, and a plurality of them are arranged side by side in the front-to-rear direction as shown in Fig. 14. As shown in Fig. 11, both the front and rear ends of the folded plate 9 form peaks 55, and the peaks 55 at the rear ends of adjacent front and rear folded plates 9 are stacked vertically and placed on the top surfaces of the rafters 2 and fixed with roof bolts 57. In addition, the peaks 55 at the front ends of the foremost folded plate 9 and the peaks 55 at the rear ends of the rearmost folded plate 9 are placed on the top surfaces of the end rafters 3 and fixed with roof bolts 57. As shown in Figure 10, the length of the folded plate 9 in the left-right direction is shorter than the rafters 2 and the end rafters 3, and the left and right edge portions 9a are located slightly outside the inner peripheral side walls 17 of the gutter portions 8 of the girders 1a and 1b. The valley portions 56 of the folded plate 9 at the left and right ends are placed on the placement portions 52b protruding from the inner peripheral side walls 17 of the gutter portions 8 of the girders 1a and 1b, and are fixed in place with screws 58 from above. The folded plate 9, like the gable rafters 3 and rafters 2, is arranged at an angle so that the right side is slightly higher, and rainwater that falls on the roof 10 flows down the valley 56 of the folded plate 9 into the gutter section 8 of the left-hand girder 1a, as shown by arrow 43 in Figure 10. The end rafters 3, rafters 2 and folded plates 9 are contained within the vertical dimension H of the girders 1a and 1b.

[0022] 10 and 14, a water skirting 59 is attached along the front-to-back direction to the top surfaces of the end rafters 3 and rafters 2. The water skirting 59 covers the gap between the folded plate 9 and the main body 7 of the girders 1a and 1b, and prevents fallen leaves and the like from entering the gutters 8 of the girders 1a and 1b.

[0023] As shown in Figure 10, the column 5 supports the girders 1a and 1b by abutting across the undersides 7a of the main bodies 7 and the undersides 8a of the gutter sections 8 of the girders 1a and 1b. Bolt rails 50, which hold bolts 49 protruding downward, are held in the bolt rail storage grooves 51 on the undersides 7a of the main bodies 7 and the undersides 8a of the girder sections 8 of the girders 1a and 1b, and the connecting fittings 60 are attached to the undersides of the girders 1a and 1b by inserting the bolts 49 into the connecting fittings 60 and fastening them with nuts. As shown in Figures 10 and 11, the connecting fittings 60 are inserted into the upper ends of the column 5 and fixed to the column 5 with bolts 61 from the front and rear. In this way, the main bodies 7 and the gutter sections 8 of the girders 1a and 1b are fixed to the column 5, respectively. As shown in Figure 12, the pillar 5 comprises a pillar body 36, a downspout base 62 attached to the front of the pillar body 36, a downspout 63 engaged with the downspout base 62 and attached to the front of the pillar body 36, and a batten 38 engaged with and attached to a groove 64 of the pillar body 36. The downspout 63 has a hollow portion 65 with a rectangular cross section, and its left and right side surfaces 66, 66 are flush with the left and right side surfaces of the column main body 36. The hollow portion 65 of the downspout 63 communicates with the gutter portions 8 of the girders 1a, 1b via the drains 25. Therefore, rainwater that enters the gutter portions 8 of the girders 1a, 1b flows through the drains 25 into the hollow portion 65 of the downspout 63, as shown by arrow 44 in Figure 10, and is drained to the outside from the lower end of the downspout 63. The batten 38 covers the groove 64 in the pillar body 36 and hides the head of the bolt 61 that secures the connecting fitting 60 to the pillar body 36. Note that the downspout 63 is only attached to the front pillar 5, while the rear pillar 5 has batten 38 attached to both the front and rear grooves 64 of the pillar body 36.

[0024] Next, the construction procedure for this simple building will be explained. First, as shown in FIG. 15-1(a), waterstop plates 27 are attached to the front and rear end faces of the left and right girders 1a and 1b, and connecting fittings 60 are attached to the undersides of the girders 1a and 1b. Next, as shown in FIG. 15-1(b), the pillars 5 (pillar bodies 36) are erected at predetermined positions, and the left and right girders 1a, 1b are erected on the upper ends of the front and rear pillars 5. Next, as shown in FIG. 15-1(c), the end rafters 3 and end gables 11 are attached between the front and rear ends of the left and right beams 1a and 1b. Next, as shown in FIG. 15-1(d), processing (hole drilling) is performed on the folded plate 9. Next, as shown in Figure 15-2(e), rafters 2 are erected between the left and right girders 1a and 1b, and then folding plates 9 are attached. Next, as shown in FIG. 15-2(f), the drip tray 59 is attached. Next, as shown in FIG. 15-2(g), a downspout 63 is attached to the pillar 5. Next, as shown in FIG. 15-2(h), the battens 38 are attached to the pillars 5.

[0025] As described above, the simple buildings of the first and second embodiments have a main body 7 consisting of hollow sections 6, 6a, 6b in the girders 1a, 1b, and a gutter section 8 provided on the inner periphery of the main body 7. The longitudinal ends of the rafters 2, 3 are fixed to the inner periphery of the main body 7 of the girders 1a, 1b, thereby enabling the height of the roof 10 to be lowered while maintaining a predetermined strength. Furthermore, since the rafters 2, 3 and roofing materials 4, 9 are contained within the vertical dimension H of the girders 1a, 1b, the rafters 2, 3 and roofing materials 4, 9 are hidden by the girders 1a, 1b, resulting in a good design. Furthermore, since the pillars 5 abut across the undersides 7a of the main body 7 of the girders 1a, 1b and the undersides 8a of the gutter section 8, water can easily flow from the gutter section 8 of the girders 1a, 1b to the pillars 5. Furthermore, in the simple buildings of the first and second embodiments, the contact surfaces 7a of the main body 7 with the column 5 and the contact surfaces 8a of the gutter 8 with the column 5 of the girders 1a and 1b are on the same plane, so the vertical dimension H of the girders 1a and 1b can be reduced, and when the girders 1a and 1b are viewed from below, there is no boundary between the main body 7 and the gutter 8, giving them a clean appearance, and since the upper end of the column 5 only needs to be cut straight, processing of the column 5 is easy. In the simple building of the first embodiment, girders 1a and 1b are made of extruded shapes in which main body 7 and gutter 8 are integrally formed, and are fixed to columns 5 at main body 7. Since the strength of girders 1a and 1b against wind pressure, gravity, etc. is mainly borne by main body 7, by fixing girders 1a and 1b to columns 5 at main body 7, the load applied to girders 1a and 1b can be efficiently transmitted to columns 5, and a predetermined strength can be stably maintained. In addition, in the simple building of the first embodiment, the roof material 4 is a resin panel, and the longitudinal ends of the rafters 2, 3 are cut out leaving the upper wall 32, thereby making it possible to further lower the height of the roof 10. In the simple building of the second embodiment, girders 1a and 1b are made of extruded shapes in which main body portion 7 and gutter portion 8 are integrally molded, and main body portion 7 and gutter portion 8 are each fixed to pillar 5, so that girders 1a and 1b can be more firmly fixed to pillar 5. Furthermore, main body portion 7 of girders 1a and 1b has a horizontal wall 67 in the middle to separate hollow portions 6a and 6b into upper and lower portions (see Figure 10), so that even if the vertical dimension H of girders 1a and 1b is larger than that of the first embodiment, main body portion 7 and gutter portion 8 can be extruded integrally.

[0026] The present invention is not limited to the above-described embodiments. The cross-sectional shapes of the beams, rafters, and columns can be modified as needed. The underside of the main body and the underside of the gutter do not necessarily need to be flush with each other. The present invention can be applied to any simple building, including not only walkway shelters and carports, but also cycle ports, bus stop sheds, and the like. [Explanation of symbols]

[0027] 1a, 1b digits 2 Rafters 3 Gable rafters (rafters) 4. Roof panels (roofing materials) 5 pillars 6,6a,6b Hollow part 7 Main body 8 Hibe 9. Folded plate (roofing material)

Claims

[Claim 1] A simple building comprising girders, rafters, roofing material, and pillars, the girders having a hollow main body and a gutter provided on the inner periphery of the main body, the pillars supporting the girders by abutting across the underside of the main body and the underside of the gutter, the rafters having their longitudinal ends fixed to the inner periphery of the main body, the roofing material attached to the rafters, and the rafters and roofing material contained within the vertical dimensions of the girders.

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