Ventilation structure

Abstract

To provide a ventilation structure with a stable mounting condition. [Solution] The ventilation structure 1 is installed on the upper part of the sloping roof and comprises main body members 2a and 2b installed on the roof and a cover member 3 positioned above the main body members 2a and 2b. The main body member 2a comprises a first barrier portion 11 that protrudes in a mountain shape, a lower plate portion 12 extending toward the waterward side from the waterward end of the first barrier portion 11, a fixing portion 21 that abuts against the upper surface of the lower plate portion 12, a first support portion 22 that abuts against the lower surface of the cover member 3 downstream of the fixing portion 21, a second support portion 23 that abuts against the lower surface of the cover member 3 upstream of the fixing portion 21, a second barrier portion 24 connecting the first support portion 22a and the fixing portion 21 and having a first opening 28, a third barrier portion 25 connecting the second support portion 23 and the fixing portion 21 and having a second opening 29, and a fourth barrier portion 26 extending from the waterward end of the second support portion 23 to the lower plate portion 12 and having a third opening 30.

Description

Technical Field

[0001] The present invention relates to a ventilation structure, and particularly to a ventilation structure installed on the water part of a roof.

Background Art

[0002] FIG. 8 is a perspective view showing the external shape of a conventional ventilation structure disclosed in Patent Document 1, and FIG. 9 is a schematic cross-sectional view showing the attachment state of the ventilation structure shown in FIG. 8 to the roof top.

[0003] Referring to these figures, the ventilation structure 101 is mainly composed of a building cover 103, a pair of louvers 104a and 104b attached to the lower surface of the building cover 103, and a pair of main bodies 105a and 105b attached to the lower surfaces of the louvers 104a and 104b.

[0004] The building cover 103 includes inclined portions 106a and 106b that extend obliquely downward along the slope of the roof, and vertical pieces 107a and 107b that extend vertically downward from the outer ends of the inclined portions 106a and 106b.

[0005] Each of the louvers 104a and 104b includes mounting plates 108a and 108b whose lower surfaces abut against the main bodies 105a and 105b in the installed state, first rising portions 109a and 109b that rise from the upper water-side ends of the mounting plates 108a and 108b, second rising portions 110a and 110b that rise from the lower water-side ends of the mounting plates 108a and 108b, support plates 111a and 111b that abut against the lower surfaces of the inclined portions 106a and 106b and extend obliquely upward from the upper ends of the first rising portions 109 (109a, 109b), and pressing plates 112a and 112b that abut against the lower surfaces of the inclined portions 106a and 106b and extend obliquely downward from the upper ends of the second rising portions 110 (110a, 110b). A plurality of blades 113 bent in a door shape are formed on the first rising portion 109 and the second rising portion 110, and ventilation is possible through ventilation openings 118 formed between the blades 113.

[0006] Each of the main bodies 105a and 105b includes a base plate 114a, 114b that rests on the roofing material 116, and a watertight section 115a, 115b that is connected to the downstream end of the base plates 114a, 114b and has a roughly triangular cross-section.

[0007] In the ventilation structure 101 configured in this way, when ventilation is in progress, as shown by arrow 120 in Figure 9, the air rising from between the flashings 117 at the top of the roof passes from the inside to the outside through the vents between each of the blades 113a, 113b of the louvers 104b and is discharged outwards from below the vertical piece 107b.

[0008] Furthermore, although rainwater is blown up along the roofing material 116 as indicated by arrow 121 in Figure 9, the waterproof section 115b redirects the flow of wind and rain upwards, causing it to pass over the ventilation structure 101, thus preventing rainwater from entering the ventilation structure 101. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2000-265631 [Overview of the project] [Problems that the invention aims to solve]

[0010] However, in conventional ventilation structures as described above, the ridge cover is mainly supported by the first and second rising sections. Therefore, when strong winds and rain blow onto the roof surface from above or the sides, there is a risk that the ridge cover may be lifted up or the louvers may be deformed, resulting in an unstable installation of the ventilation structure.

[0011] This invention was made to solve the above-mentioned problems and aims to provide a ventilation structure with a stable mounting condition. [Means for solving the problem]

[0012] To achieve the above objective, the invention described in claim 1 is a ventilation structure installed to cover a ventilation opening formed in the upstream portion of a sloping roof, comprising a main body member installed at a downstream position of the ventilation opening, and a cover member positioned above the main body member to cover the ventilation opening, wherein the main body member comprises a first barrier portion projecting in a mountain shape downstream of the cover member, a lower plate portion extending upstream from the upstream end of the first barrier portion, a fixing portion abutting the upper surface of the lower plate portion, a first support portion abutting the lower surface of the cover member downstream of the fixing portion, a second support portion abutting the lower surface of the cover member upstream of the fixing portion, a second barrier portion connecting the first support portion and the fixing portion and having a first opening, a third barrier portion connecting the second support portion and the fixing portion and having a second opening, and a fourth barrier portion extending from the upstream end of the second support portion to the lower plate portion and having a third opening, and the cover member is attached to the first support portion by a fastener.

[0013] With this configuration, the first barrier prevents rainwater from entering, while the second, third, and fourth barriers distribute the pressure from above the cover member.

[0014] The invention described in claim 2 is the configuration of the invention described in claim 1, wherein the first support portion includes a projection that extends along the lower surface of the cover member and a reinforcing portion that folds back from the downstream end of the projection and extends upstream so as to be doubled along the projection.

[0015] With this configuration, the thickness of the mounting portion between the cover member and the main body member becomes larger compared to other parts.

[0016] The invention described in claim 3 is the configuration of the invention described in claim 2, wherein the reinforcing portion has the same length as the protruding portion.

[0017] With this configuration, the area of ​​the double portion consisting of the protruding part and the reinforcing part increases.

[0018] The invention according to claim 4 is the invention according to claim 1 or claim 2, wherein the cover member includes an inclined portion extending along the slope of the roof portion and an eaves portion extending so as to reduce the opening area of the air inlet on the outer side of the first support portion.

[0019] With such a configuration, the eaves portion increases the resistance when rainwater intrudes.

[0020] The invention according to claim 5 is the invention according to claim 4, wherein the protruding length of the lower plate portion of the first barrier portion with respect to the lower plate portion is longer than the vertical length of the lower plate portion of the underwater lower end portion of the inclined portion, and the end portion of the eaves portion is located above the center of the vertical length of the lower plate portion of the underwater lower end portion of the inclined portion.

[0021] With such a configuration, a sufficient ventilation path is ensured at the end portion of the cover member.

[0022] The invention according to claim 6 is the invention according to claim 1 or claim 2, wherein the first support portion and the second support portion are arranged in a parallel state with respect to the roof portion, the angle formed by the second barrier portion and the first support portion is set to 90 degrees, the angle formed by the third barrier portion and the second support portion is set to 90 degrees, and the angle formed by the fourth barrier portion and the second support portion is set to 90 degrees.

[0023] With such a configuration, the second barrier portion, the third barrier portion, and the fourth barrier portion are arranged so as to be perpendicular to the cover member and the roof portion.

Advantages of the Invention

[0024] As described above, the invention according to claim 1 prevents rainwater from infiltrating by the first barrier portion, and the pressure from above the cover member is dispersed by the second barrier portion, the third barrier portion, and the fourth barrier portion. Therefore, waterproof performance is exhibited and the mounting state of the ventilation structure is stabilized.

[0025] In addition to the effects of the invention according to claim 1, in the invention according to claim 2, the thickness of the attachment portion between the cover member and the main body member is larger than that of other portions, so the strength of the attachment portion is improved and the attachment state of the ventilation structure becomes stable.

[0026] In addition to the effects of the invention according to claim 2, in the invention according to claim 3, since the area of the double portion of the protruding portion and the reinforcing portion increases, the strength of the attachment portion is further improved and the attachment becomes easier.

[0027] In addition to the effects of the invention according to claim 1 or claim 2, in the invention according to claim 4, since the eaves portion expands the resistance when rainwater intrudes, the waterproof performance of the ventilation structure is improved.

[0028] In addition to the effects of the invention according to claim 4, in the invention according to claim 5, since a sufficient ventilation path is ensured at the end of the cover member, excellent ventilation function and waterproof function are exhibited.

[0029] In addition to the effects of the invention according to claim 1 or claim 2, in the invention according to claim 6, since the second barrier portion, the third barrier portion and the fourth barrier portion are arranged perpendicular to the cover member and the roof portion, the ventilation structure has a stable shape.

Brief Description of the Drawings

[0030] [Figure 1] It is a plan view showing the external shape of the ventilation structure according to the first embodiment of this invention. [Figure 2] It is an enlarged cross-sectional view taken along the line II-II shown in FIG. 1. [Figure 3] It is an enlarged view of the portion A shown in FIG. 2. [Figure 4] It is a schematic exploded end view showing the attachment process of the ventilation structure shown in FIG. 1 to the roof portion. [Figure 5] It is a schematic end view showing the attachment state of the ventilation structure shown in FIG. 1 to the roof portion. [Figure 6] It is a cross-sectional view showing the fit when the ventilation structure according to the second embodiment of this invention is used for a single-slope roof. [Figure 7] This is a cross-sectional view showing the installation of a ventilation structure according to the third embodiment of this invention when used on a lower roof. [Figure 8] This is a perspective view showing the external shape of a conventional ventilation structure disclosed in Patent Document 1. [Figure 9] Figure 8 is a schematic cross-sectional view showing the installation of the ventilation structure on the roof apex. [Modes for carrying out the invention]

[0031] Figure 1 is a plan view showing the external shape of a ventilation structure according to the first embodiment of this invention, Figure 2 is an enlarged end view of the line II-II shown in Figure 1, and Figure 3 is an enlarged view of portion A shown in Figure 2.

[0032] Referring to Figures 1 to 3, the ventilation structure 1 mainly consists of a main body member 2 formed by press-forming a steel plate and a cover member 3 formed by press-forming a steel plate and installed so as to cover the main body member 2. The ventilation structure 1 is installed on the upper part of the sloping roof section, which will be described later. In this embodiment, the ventilation structure 1 is installed at the top of a double-slope roof and consists of a pair of main body members 2a and 2b, which are respectively installed on a pair of roofing materials, and a cover member 3 that is positioned to cover the upper part of each of the pair of main body members 2a and 2b.

[0033] The main body member 2a consists of a first member 10a positioned on the roof and a second member 20a that is placed on the first member 10a and positioned below the cover member 3.

[0034] The first member 10a comprises a first barrier portion 11 that protrudes in a mountain shape downstream of the cover member 3 when installed, a lower plate portion 12 extending upstream from the upstream end of the first barrier portion 11, and a rising piece 13 extending vertically upward from the upstream end of the lower plate portion 12.

[0035] The first barrier section 11 comprises a rising section 14 extending from the downstream end of the lower plate section 12 to the peak of the mountain shape, and a water-blocking section 15 extending diagonally downward from the peak. Below the rising section 14, a plurality of drainage holes 16 are formed at predetermined intervals.

[0036] The second member 20a includes a fixing portion 21 having a flat surface and whose lower surface abuts against the upper surface of the lower plate portion 12, a first support portion 22 having a flat surface and whose upper surface abuts against the lower surface of the cover member 3 downstream of the fixing portion 21, a second support portion 23 having a flat surface and whose upper surface abuts against the lower surface of the cover member 3 upstream of the fixing portion 21, a flat plate portion 27 having a flat surface and whose lower surface abuts against the upper surface of the lower plate portion 12 downstream of the second support portion 23, a second barrier portion 24 connecting the first support portion 22 and the fixing portion 21, a third barrier portion 25 connecting the second support portion 23 and the fixing portion 21, and a fourth barrier portion 26 extending from the downstream end of the second support portion 23 to the lower plate portion 12 and connecting the second support portion 23 and the flat plate portion 27. A plurality of first openings 28 are formed at predetermined intervals below the second barrier portion 24. Multiple second openings 29 are formed at predetermined intervals above the third barrier section 25. Multiple third openings 30 are formed at predetermined intervals below the fourth barrier section 26. That is, the second barrier section 24, the third barrier section 25, and the fourth barrier section 26 are arranged between the lower plate section 12 and the cover member 3 so as to traverse the ventilation path from indoors to outdoors, and the first opening 28, the second opening 29, and the third opening 30 are formed in staggered positions. With this configuration, rainwater from the outside collides with the second barrier section 24, the third barrier section 25a, and the fourth barrier section 26. On the other hand, air passes through the first opening 28, the second opening 29, and the third opening 30, ensuring a ventilation path from indoors to outdoors.

[0037] In the installed state, the first support portion 22, the second support portion 23, the fixing portion 21, and the flat plate portion 27 are arranged parallel to the roof portion (not shown). The angle θ1 between the second barrier portion 24 and the first support portion 22 is set to 90 degrees, the angle θ2 between the third barrier portion 25 and the second support portion 23a is set to 90 degrees, and the angle θ3 between the fourth barrier portion 26 and the second support portion 23 is set to 90 degrees. The effects of these arrangements will be described later.

[0038] The first support portion 22 has a flat surface and includes a projection 31 extending along the lower surface of the cover member 3, and a reinforcing portion 32 that extends upstream along the projection 31, folded downward from the downstream end of the projection 31, with its upper surface in contact with the lower surface of the cover member 3, so as to be doubled. The effects of this configuration will be described later.

[0039] Furthermore, the main body member 2b on the other side has the same configuration as the main body member 2a described above. Also, the part indicated by B in Figure 2 has the same structure as the part indicated by A described above, so its explanation will not be repeated.

[0040] The cover member 3 comprises a pair of inclined sections 41a and 41b that extend along the slope of the roof section of the double-slope roof when installed, and a pair of canopy sections 42a and 42b that extend from the downstream ends of the inclined sections 41a and 41b at a predetermined distance in the direction toward the first members 10a and 10b. When installed, the lower surface of the inclined section 41a abuts against the upper surfaces of the first support section 22 and the second support section 23. The canopy section 42a extends outward from the first support section 22 to reduce the opening area of ​​the air inlet. The inclined section 41b and canopy section 42b on the other side have the same configuration as the inclined section 41a and canopy section 42a. The effects of this configuration will be described later.

[0041] Next, we will explain how to attach the ventilation structure shown in Figure 1 to the roof.

[0042] Figure 4 is a schematic exploded end view showing the installation process of the ventilation structure shown in Figure 1 onto the roof.

[0043] Referring to Figure 4, the double-slope roof 50 has a pair of roof underlays 52a and 52b that extend diagonally downward and have ventilation openings 51 formed at their tops, and a pair of roofing materials 53a and 53b made of metal plates laid on the upper surface of the roof underlays 52a and 52b. The roofing material 53a has a raised section 56a formed at the upstream end by a Yachiyo-ori process. The roofing materials 53a and 53b are installed on the roof underlays 52a and 52b, which are installed on rafters (not shown), via roofing felt and underlayment (not shown).

[0044] Above the roof underlayment 52a and 52b, a flashing 54a with an L-shaped cross-section in the direction of flow and wooden underlayment 55a and 55b are installed. Additionally, on the upper surface of the roofing material 53a and 53b, chemical flashing 57a and 57b are installed at the downstream side of the rising processed section 56a and 56b, and apron flashing 58a and 58b are installed on the upper surface of the roofing material 53a and 53b downstream of the chemical flashing 57a and 57b.

[0045] For installation, first, the lower surface of the lower plate portion 12 is placed on the upper surface of the apron flashing 58a, and the first member 10a is placed on the wooden base 55a via the apron flashing 58a. Then, the second member 20a is placed on top of the first member 10a. Specifically, the lower surfaces of the fixing portion 21 and the flat plate portion 27 are brought into contact with the upper surface of the lower plate portion 12. After that, fasteners 59a such as screws are driven in from above the fixing portion 21 to fix the first member 10a and the second member 20a to the wooden base 55a.

[0046] Next, attach the main body member 2b to the other side using the same procedure as for the main body member 2a.

[0047] Next, the cover member 3 is lowered from above the main body members 2a and 2b (first members 10a and 10b and second members 20a and 20b) so as to overlap the second members 20a and 20b. This causes the lower surface of the inclined portion 41a to contact the upper surfaces of the first support portion 22 and the second support portion 23. The inclined portion 41a of the cover member 3 is then fastened to the upper surface of the first support portion 22 using fasteners 34a such as screws. Similarly, the inclined portion 41b is fastened to the second member 20b using fasteners 34b such as screws, following the same procedure as with the inclined portion 41a.

[0048] When the ventilation structure 1 is installed on the double-slope roof in this manner, the situation is as shown in Figure 5.

[0049] Figure 5 is a schematic end view showing the installation of the ventilation structure shown in Figure 1 onto the roofing material.

[0050] Referring to Figure 5, the main body members 2a and 2b are installed on the downstream side of the ventilation opening 51, and the cover member 3 is positioned above the main body members 2a and 2b so as to cover the ventilation opening 51. In this way, the ventilation structure 1 is installed so as to cover the ventilation opening 51 formed at the top of the double-slope roof (the upstream portion of the sloping roof).

[0051] In a ventilated state, as shown by the double arrows in Figure 5, air inside the building moves outward from the ventilation opening 51 through the first opening 28, second opening 29, and third opening 30 of the second member 20a, which is positioned between the cover member 3 and the first member 10a of the ventilation structure 1. On the other hand, when outside air enters the building, the flow is the opposite of that shown by the double arrows in Figure 5.

[0052] On the other hand, rainwater attempts to enter the ventilation structure 1 through the air inlet. However, the ventilation structure 1 is shielded by the first barrier section 11, the second barrier section 24, the third barrier section 25, and the fourth barrier section 26, and is configured to prevent water from entering the interior.

[0053] More specifically, referring to Figure 3, the projection length L1 of the first barrier section 11 relative to the lower plate section 12 is set to be longer than the vertical length L2 of the downstream end of the inclined section 41a relative to the lower plate section 12. That is, the first barrier section 11 protrudes to a position higher than the downstream end of the inclined section 41a when viewed from the downstream side (to the right in Figure 3). As a result, most of the rainwater blown along the roofing material from the downstream side collides with the first barrier section 11, thus exhibiting high waterproofing performance. In addition, the end of the canopy section 42a is located above the center of the vertical length L2 of the downstream end of the inclined section 41a relative to the lower plate section 12. That is, the vertical length L3 of the end of the canopy section 42a relative to the lower plate section 12 is set to a length of 1 / 2L2 or more. In this way, a sufficient ventilation path is secured at the end of the cover member 3, resulting in excellent ventilation and waterproofing performance.

[0054] Next, we will explain the effects of ventilation structure 1. Note that the following explanation will focus on the effects of the part indicated by A. However, since the part indicated by B, which has a similar configuration to the part indicated by A, exhibits the same effects, the explanation for B will not be repeated.

[0055] Referring to Figures 3 and 5, as described above, the formation of the first barrier portion 11 causes most of the rainwater blown up from diagonally downward along the roofing material 53a to collide with the watertight portion 15 of the first barrier portion 11, preventing rainwater from entering. Furthermore, because the first barrier portion 11 protrudes diagonally upward toward the water side relative to the roofing material 53a, the flow of wind and rain blown up along the roofing material 53a changes and is directed upward towards the first barrier portion 11, making it difficult for rainwater to penetrate through the air inlet.

[0056] Here, some of the wind and rain directed upwards from the first barrier section 11 is directed towards the cover member 3, as shown by the dotted arrow in Figure 5. As a result, wind and rain are blown onto the edge of the cover member, which could cause the cover member to be lifted up and come off. In addition, strong winds could deform the overall shape of the ventilation structure. Therefore, although waterproofing performance is improved by providing a watertight section at the downstream end of the ventilation structure, conventional ventilation structures still had room for improvement in terms of stability of the mounting state. In contrast, as described above, in the ventilation structure 1 according to this embodiment, the first barrier section 11 is positioned at the downstream end, and surfaces supporting the cover member 3 are provided on both the upstream and downstream sides, respectively, and a second barrier section 24, a third barrier section 25, and a fourth barrier section 26 are provided, which are connected to the first support section 22 and the second support section 23 and extend to the lower plate section 12. With this configuration, the first barrier section 11 prevents rainwater from entering. Furthermore, the second barrier section 24 and the third barrier section 25 are positioned between the first support section 22 and the second support section 23, and the fourth barrier section 26 is positioned on the upstream side of the second support section 23, thereby distributing the load of the cover member 3 from the upstream side to the downstream side. In particular, the second barrier section 24 and the third barrier section 25 support the cover member 3 from multiple points at regular intervals. As a result, waterproofing performance is achieved, and the mounting state of the ventilation structure 1 is stabilized.

[0057] Furthermore, the first support portion 22 and the second support portion 23 are arranged parallel to the roofing material 53a (roof section), the angle θ1 between the second barrier portion 24 and the first support portion 22 is set to 90 degrees, the angle θ2 between the third barrier portion 25 and the second support portion 23 is set to 90 degrees, and the angle θ3 between the fourth barrier portion 26 and the second support portion 23 is set to 90 degrees. With this configuration, the second barrier portion 24, the third barrier portion 25, and the fourth barrier portion 26 are arranged perpendicular to the cover member 3 and the roofing material 53a (roof section), resulting in a stable shape for the ventilation structure 1. In addition, when the cover member 3 is attached, even if the load of the cover member 3 is applied to the main body member 2a, the deflection of the second member 20a is suppressed, and the ventilation path is less likely to collapse.

[0058] Furthermore, as described above, the first support portion 22 includes a projection 31 extending along the lower surface of the cover member 3, and a reinforcing portion 32 that folds back from the downstream end of the projection 31 and extends upstream along the projection 31 in a double layer. With this configuration, the thickness of the mounting portion between the cover member 3 and the main body member 2a becomes larger than that of other portions. Specifically, the first support portion 22 is twice as thick as the second support portion 23. When the cover member 3 is attached, the thickness of that portion becomes the sum of the inclined portion 41a, the projection 31, and the reinforcing portion 32, making the thickness of the mounting portion between the cover member 3 and the main body member 2a three times the thickness of other portions. As a result, even if force is applied from the outside (above or from the side) due to strong winds or storms, the mounting portion is less likely to bend. Therefore, the strength of the mounting portion is improved, and the mounting state of the ventilation structure 1 is stabilized.

[0059] Furthermore, as described above, the length L5 of the reinforcing portion 32 is approximately the same as the length L4 of the protruding portion 31. With this configuration, the area of ​​the overlapping portion of the protruding portion 31 and the reinforcing portion 32 increases. As a result, the mounting portion becomes less prone to bending, and the strength is further improved. In addition, when attaching the fastener 34a, the area over which it can be fastened is widened, making installation easier.

[0060] Furthermore, some rainwater blown in from above collides with the eaves 42a, while other rainwater does not collide with the eaves 42a but flows towards the air inlet between the lower end of the eaves 42a and the lower plate 12. However, the majority of this rainwater flows downstream and is discharged through the drainage holes 16. Even if rainwater attempts to enter the ventilation structure 1 from the air inlet, the presence of the second barrier 24, third barrier 25, and fourth barrier 26 causes some of the rainwater to collide with the second barrier 24, some of the rainwater heading towards the first opening 28 of the second barrier 24 to collide with the third barrier 25, and some of the rainwater heading towards the second opening 29 of the third barrier 25 to collide with the fourth barrier 26. Thus, because the structure is shielded in three stages by the second barrier 24, third barrier 25, and fourth barrier 26, it becomes difficult for rainwater to penetrate. Furthermore, air flows in a meandering manner between the second barrier section 24, the third barrier section 25, and the fourth barrier section 26. As a result, the force of rainwater gradually decreases as it collides with the barrier sections, the corner sections formed by each barrier section and the inclined section 41a, and the corner sections formed by each barrier section and the lower plate section 12. Consequently, it becomes more difficult for rainwater to penetrate, and the waterproofing performance is improved.

[0061] Figure 6 is a cross-sectional view showing the installation of a ventilation structure according to the second embodiment of this invention when used on a single-slope roof.

[0062] Referring to Figure 6, the ventilation structure 61 is made up of a cover member 63 in which the cover member 3 in the ventilation structure 1 according to the first embodiment has been replaced, and is installed on a single-slope roof. Note that the other components (main body member 2) are the same as the main body member 2a of the ventilation structure 1 according to the first embodiment, so their description will not be repeated here.

[0063] The cover member 63 includes an inclined portion 64 that extends along the slope of the roof, an overhang portion 65 that extends from the downstream end of the inclined portion 64 to the outside of the first support portion 22 in order to reduce the opening area of ​​the air inlet, and a hanging portion 66 that extends vertically downward from the upstream end of the inclined portion 64. With this configuration, the main body members used for a double-slope roof can also be used to install a single-slope roof, resulting in a highly versatile ventilation structure.

[0064] The single-slope roof 70 has an exterior wall portion 71 extending vertically downward, a roof base 76 extending diagonally downward with a ventilation opening 74 formed at its apex, and a metal roofing material 53 laid on the upper surface of the roof base 76. The exterior wall portion 71 is composed of a gable base 72 extending vertically downward, an exterior wall material 77 installed below the gable base 72, and a gable board 73 attached to the outside of the gable base 72. The upper end of the gable base 72 is positioned to abut the lower surface of the top of the roof base 76. The upper end of the gable board 73 is positioned higher than the top of the roof base 76, and the top of the roof base 76 abuts against the upper part of the gable board 73. The roofing material 53 is the same as the roofing material 53 in the first embodiment. Furthermore, on the downstream side of the ventilation opening 74, a flashing 54, wooden base 55, chemical flashing 57, apron flashing 58, and roofing material 53 are installed, similar to the first embodiment. In addition to these, on the upstream side of the ventilation opening 74, wooden base 75 (75a, 75b) is installed on the upper surface of the roof base 76.

[0065] For installation, first, the main body member 2 is attached to the downstream side of the roof ventilation opening 74 using the same procedure as in the first embodiment. Next, the cover member 73 is lowered from above the main body member 2 so as to overlap the second member 20. Then, on the downstream side of the inclined section 64, the lower surface of the inclined section 64 is in contact with the upper surfaces of the first support section 22 and the second support section 23. On the upstream side of the inclined section 64, the lower surface of the inclined section 64 is in contact with the wooden base 75b. The hanging portion 66 is then fastened to the exterior wall section 71 with screws or the like, and the inclined section 64 of the cover member 73 is fastened to the upper surface of the first support section 22 with fasteners 34 such as screws.

[0066] Figure 7 is a cross-sectional view showing the installation of a ventilation structure according to the third embodiment of this invention when used on a lower roof.

[0067] Referring to Figure 7, the ventilation structure 81 is made up of a cover member 83 in which the cover member 3 in the ventilation structure 1 according to the first embodiment has been replaced, and is installed at the joint between the outer wall of the main building and the roofing material of the lower roof. Note that the other components (main body member 2) are the same as the main body member 2a of the ventilation structure 1 according to the first embodiment, so their description will not be repeated here.

[0068] The cover member 83 includes an inclined portion 84 that extends along the slope of the roof, an overhang portion 85 that extends from the downstream end of the inclined portion 84 to the outside of the first support portion 22 in order to reduce the opening area of ​​the air inlet, and a vertical portion 86 that extends vertically upward from the upstream end of the inclined portion 84. With this configuration, the main body member 2 used for the double-slope roof can also be installed at the junction of the purlin and the lean-to roof, resulting in a highly versatile ventilation structure.

[0069] At the joint in the longitudinal direction (depth direction in Figure 7), an exterior wall base 91 is installed on the exterior wall of the main building, and a roof base 52 is installed on the roof of the lean-to building. Waterproof paper (not shown) is laid along the outer surface of the exterior wall base 91 and the upper surface of the roof base 52. A ventilation opening 92 is formed in the upstream portion of the sloping roof. Downstream from the ventilation opening 92, a flashing 54, wooden base 55, chemical flashing 57, apron flashing 58, and roofing material 53 are installed, similar to the first embodiment.

[0070] For installation, first, the main body member 2 is attached to the lower roof using the same procedure as in the first embodiment. Next, the cover member 83 is lowered from above so as to cover the joint portion. At this time, the vertical portion 86 is in contact with the exterior wall substrate 91, and the inclined portion 84 is in contact with the upper surfaces of the first support portion 22 and the second support portion 23.

[0071] Next, the vertical section 86 is fastened to the exterior wall substrate 91 with screws or the like, and the inclined section 41 of the cover member 3 is fastened to the upper surface of the first support section 22 with fasteners 34 such as screws. After that, a breathable waterproof sheet (not shown) is attached to the exterior wall substrate 91 and the vertical section 86 so as to cover the upper outer surface of the vertical section 86. Then, several rod-shaped furring strips 93 extending in the vertical direction are installed at predetermined intervals in the girder direction on the outer surface of the breathable waterproof sheet, and plate-shaped exterior wall material 94 is installed from the outer surface of the furring strips 93 so as to span across each of the furring strips 93.

[0072] In the embodiments described above, the main body consisted of a first member and a second member, but it may also be made into a single member by welding or bending it beforehand.

[0073] Furthermore, in each of the embodiments described above, the first support portion was composed of a protruding portion and a reinforcing portion, but the reinforcing portion is not required.

[0074] Furthermore, although the reinforcing portion was folded downwards in each of the above embodiments, it may also be folded upwards.

[0075] Furthermore, in each of the embodiments described above, the length of the reinforcing portion was strictly slightly shorter than the length of the protruding portion. However, since the reinforcing portion is constructed by folding back from the tip of the protruding portion, even if there is a slight error in length, it is substantially included within the same length.

[0076] Furthermore, in each of the embodiments described above, the length of the reinforcing portion was substantially the same as the length of the protruding portion, but it may also be formed to be longer than the length of the protruding portion by folding it upwards, for example.

[0077] Furthermore, in each of the embodiments described above, the second barrier section, the third barrier section, and the fourth barrier section were arranged perpendicular to the cover member and the roofing material, but they may be at other angles.

[0078] Furthermore, in each of the above embodiments, the cover member was composed of an inclined portion and a canopy portion, but the canopy portion is not required.

[0079] Furthermore, in each of the embodiments described above, the projection length of the first barrier portion relative to the lower plate portion was set to be longer than the vertical length of the downstream end of the inclined portion relative to the lower plate portion, but it may be set to be the same or shorter.

[0080] Furthermore, in each of the above embodiments, the end of the canopy portion was located above the midpoint of the vertical length of the downstream end of the inclined portion relative to the lower plate portion, but it may also be located below.

[0081] Furthermore, in each of the above embodiments, the main body member and the cover member were connected by fasteners such as screws, but other fasteners or other fastening means such as adhesive may also be used.

[0082] Furthermore, although the ventilation structure in each of the above embodiments was made of steel plate, it may be made of other materials.

[0083] Furthermore, while the cover component had a specific inclination angle, the inclination angle can be changed to match the slope of the roof. In this case, the change can be made at the factory before shipment, or it can be adjusted at the construction site.

[0084] Furthermore, in each of the above embodiments, the first, second, and third openings are formed at specific locations in the second, third, and fourth barrier sections, but are not limited thereto. They may be formed in the upper, central, or lower portion of the barrier section, or they may be provided across the entire height. The shape of the openings is also not particularly limited.

[0085] Furthermore, although the above embodiments were constructed in a specific order, the order is not limited, and the construction can be carried out in any order as long as the final installation is as in each embodiment. For example, in the second embodiment above, the gable base and gable boards were installed after the roof base was installed, but the construction can also be carried out from the exterior wall side, or the roof side and exterior wall side can be carried out simultaneously, and the order is not limited. [Explanation of Symbols]

[0086] 1, 61, 81… Ventilation structure 2…Main body components 3, 63, 83... Cover components 11…First Barrier Section 12...Lower plate part 21...Fixed part 22...First support part 23...Second support part 24...Second Barrier Section 25...Third Barrier Section 26...Fourth Barrier Section 28…First opening 29...Second opening 30…Third opening 31...Protrusion 32…Reinforcement 34... Fixture 41, 64, 84...Slope part 42, 65, 85...Eave 51…Ventilation vent In each figure, the same reference numeral indicates the same or corresponding part.

Claims

1. A ventilation structure installed to cover a ventilation opening formed in the water-facing portion of a sloping roof, A main body member is installed at the downstream position of the ventilation opening, The system comprises a cover member positioned above the main body member so as to cover the ventilation opening, The main body member is, A first barrier portion that protrudes in a mountain shape downstream of the cover member, A lower plate portion extending toward the water side from the water side end of the first barrier portion, A fixing part that contacts the upper surface of the lower plate portion, A first support portion that abuts against the lower surface of the cover member downstream of the aforementioned fixing portion, A second support portion that abuts against the lower surface of the cover member on the waterward side of the aforementioned fixing portion, A second barrier portion is formed by connecting the first support portion and the fixing portion, and having a first opening. A third barrier portion is formed by connecting the second support portion and the fixing portion, and having a second opening. It comprises a fourth barrier portion that extends from the water-side end of the second support portion to the lower plate portion and has a third opening formed therein, The cover member is attached to the first support portion by fasteners, forming a ventilation structure.

2. The first support portion includes a projection extending along the lower surface of the cover member, The ventilation structure according to claim 1, further comprising a reinforcing portion that is folded back from the downstream end of the protruding portion and extends upstream along the protruding portion in a double layer.

3. The ventilation structure according to claim 2, wherein the reinforcing portion has the same length as the protruding portion.

4. The cover member has an inclined portion that extends along the slope of the roof section, The ventilation structure according to claim 1 or claim 2, further comprising a canopy portion extending outward from the first support portion to reduce the opening area of ​​the air inlet.

5. The projection length of the first barrier portion relative to the lower plate portion is longer than the vertical length of the downstream end of the inclined portion relative to the lower plate portion. The ventilation structure according to claim 4, wherein the end of the canopy portion is located above the midpoint of the vertical length of the downstream end of the inclined portion with respect to the lower plate portion.

6. The first support portion and the second support portion are arranged parallel to the roof portion. The angle between the second barrier portion and the first support portion is set to 90 degrees. The angle between the third barrier and the second support is set to 90 degrees. The ventilation structure according to claim 1 or claim 2, wherein the angle between the fourth barrier portion and the second support portion is set to 90 degrees.

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