JP7694261B2 - External wall structure - Google Patents

Description

The present invention relates to an exterior wall structure that prevents water from entering through ventilation holes formed in the exterior wall body.

A foundation drain as described in Patent Document 1 is known for preventing flooding inside structures during flood damage. This foundation drain allows ventilation through the exterior wall and underfloor ventilation openings, but covers the exterior wall and underfloor ventilation openings from the outside to prevent water from entering the interior through the exterior wall and underfloor ventilation openings if the water level outside the building rises due to a flood or the like.

Specifically, the foundation drain includes a drain member including a drain section main body that is positioned on the outdoor side of the wooden house relative to both the exterior wall ventilation openings and the underfloor ventilation openings, a receiving member that covers the exterior wall ventilation openings and the underfloor ventilation openings from the outside and has a downward opening that opens downward, and a water stop valve that is rotatable about an axis parallel to the width direction of the exterior wall between a position that opens the downward opening and a position that closes it.

In the open position, the tip of the stop valve (the end facing the outside) is located lower than the base end (the end facing the inside). The water pressure from the outside pushes the stop valve against the drain, blocking the downward opening. This makes it possible to prevent water from entering the interior through the exterior wall vent and underfloor vent even during floods.

JP 2016-132869 A

In the foundation drain described in Cited Document 1, the tip (outdoor end) of the stop valve is located lower than the base (indoor end) when the stop valve is in the open position. As a result, there is a risk that floating foreign objects may become caught between the drain and the stop valve as the water level rises during the rotation of the stop valve. If a foreign object becomes caught between the drain and the stop valve, the downward opening cannot be blocked, and water cannot be prevented from entering the interior through the exterior wall ventilation opening and underfloor ventilation opening.

The present invention was made in consideration of the above-mentioned problems, and aims to provide an exterior wall structure that can effectively prevent water from entering the interior of a building during floods, etc.

In order to solve the above-mentioned problems, the exterior wall structure of the present invention includes an exterior wall main body having an exterior wall and a foundation supporting the exterior wall, and having a vent hole that opens to the outside for underfloor ventilation, a regulating member for regulating the flow of water through the vent hole, a support section that supports the regulating member movably with respect to the exterior wall main body on the outside of the exterior wall main body so that the regulating member is displaced from a first position that allows gas to flow through the vent hole to a second position that regulates water intrusion from the outside of the building into the inside of the building through the vent hole by receiving a force from water when the water level outside the exterior wall main body reaches a predetermined water level, and and an elastic body including a spring that biases the regulating member toward the first position, wherein the support portion supports the regulating member so that the regulating member can be displaced from the first position to the second position while permitting the flow of gas above the regulating member while restricting the intrusion of water below the specified water level from the outside of the regulating member to the inside of the regulating member, and the elastic body has an elastic force that allows the regulating member to move from the first position to the second position when the water level reaches the specified water level that is preset as a height position below the height position of the upper end of the regulating member in the first position.

According to this exterior wall structure, the restricting member is supported so that it can be displaced from the first position to the second position while restricting the intrusion of water from the outside of the restricting member to the inside of the restricting member and allowing the flow of gas above the restricting member. Therefore, during the period until the water level outside the building rises due to a flood or the like and the restricting member is subjected to the force of water from outside the building and displaces from the first position to the second position, the ventilation performance of the air vent can be secured while preventing water from invading the restricting member into the interior of the building.

Furthermore, since the elastic body has an elastic force that allows the regulating member to move from the first position to the second position when the water level reaches a predetermined water level that is set in advance as a height position below the height position of the upper end of the regulating member in the first position, the regulating member can be displaced to the second position before the water level exceeds the height position of the upper end of the regulating member. Therefore, it is possible to prevent foreign objects floating in the water from exceeding the height position of the upper end of the regulating member and entering the building side of the regulating member. Therefore, by preventing foreign objects from entering between the regulating member and the exterior wall main body, it is possible to reliably displace the regulating member to the second position as the water level rises, and effectively prevent water from entering the inside of the building. In addition, when the water level outside the building drops while the regulating member is in the second position, the elastic force of the elastic body can return the regulating member from the second position to the first position.

In the exterior wall structure, it is preferable that the support portion has a positioning portion that positions the restricting member so as to restrict the movement of the restricting member in the first position in a direction away from the second position.

With this configuration, the position of the regulating member in the first position is determined by the positioning unit, so the amount of displacement of the regulating member between the first position and the second position can be kept constant. This makes it possible to appropriately set the elastic force required for the regulating member to displace from the first position to the second position.

In the outer wall structure, it is preferable that the support portion further has a rotation axis for rotatably supporting the regulating member so that the regulating member can be displaced between the first position and the second position, and the positioning portion positions the regulating member so that the radially outer end of the rotation axis of the regulating member is located above the rotation axis when the regulating member is in the first position.

With this configuration, since the regulating member is supported rotatably, a force acts to rotate the regulating member around the pivot axis as the water level rises. At this time, the closer the water surface is to the radially outer end of the regulating member, the greater this force becomes. Therefore, when the regulating member is in the second position as the water level rises, water can be more effectively prevented from entering the interior.

In addition, the regulating member is positioned so that the radially outer end of the rotation axis of the regulating member is located above the rotation axis when the regulating member is in the first position, which makes it possible to prevent foreign objects from being interposed between the regulating member and the building before the water level reaches a predetermined water level.

The exterior wall structure is attached to the exterior wall body so as to cover the vent from the outside, and further includes an opening forming part in which an opening communicating with the vent is formed, and the support part preferably supports the restricting member so as to extend outward from the opening forming part and to be displaced from a first position that allows gas to flow through the opening to a second position that restricts water from entering the building from the outside through the opening.

According to this configuration, by forming an opening in the opening forming portion provided to cover the ventilation hole, ventilation performance can be ensured, and by closing the opening with the restricting member displaced to the second position, intrusion of water through the ventilation hole can be restricted. In addition, by providing a support portion in this opening forming portion, the restricting member can be displaced from the first position to the second position while restricting the intrusion of water from the outside to the inside of the restricting member and allowing the flow of gas above the restricting member, and the configuration that supports the restricting member can be consolidated in the opening forming portion, resulting in a simple configuration.

It is preferable that the outer wall structure further has an extension extending from the opening forming portion so as to cover the opening from above in the opening forming portion to prevent water from entering the opening from above.

According to this configuration, an opening is formed in the opening forming part that is provided to cover the vent, and an extension part is provided on this opening forming part, thereby preventing rainwater from entering the vent. Therefore, by attaching the opening forming part with the extension part to the exterior wall main body, the configuration for preventing rainwater from entering through the vent can be concentrated in the opening forming part, resulting in a simple configuration.

In the exterior wall structure, it is preferable that the support portion further includes a water-stopping member that covers the regulating member from the side and supports the regulating member so that the regulating member can be displaced between the first position and the second position while restricting the flow of water between the regulating member and the support portion.

According to this configuration, the restricting member is supported so that it can be displaced between the first position and the second position while being covered by the water-stopping member that covers the side of the restricting member. Therefore, when the restricting member rotates due to the force of the water as the water level rises, it is possible to prevent water from entering the building side of the restricting member from the side of the restricting member.

As explained above, the exterior wall structure of the present invention can effectively prevent water from entering the building during floods, etc.

1 is a vertical cross-sectional view showing a building according to an embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing a part of FIG. 1 . FIG. FIG. 11 is a vertical cross-sectional view of an exterior wall structure according to a modified example of the present invention.

The following describes a building 1 to which the present invention is applied, with reference to the attached drawings. Note that the following embodiment is an example of the present invention, and is not intended to limit the technical scope of the present invention. In addition, in this embodiment, a wooden building is used as the building 1, but the building to which the present invention is applied is not limited to a wooden building 1, and may be other buildings such as a reinforced concrete building or a lightweight steel frame building.

As shown in FIG. 1, the building 1 of this embodiment has an exterior wall structure 20 and a floor structure 10 provided inside the exterior wall structure 20. In the following, the right side of the paper in FIG. 1 will be referred to as the inside (the inside of the building 1), the left side of the paper will be referred to as the outside (the outside of the building 1), and the direction perpendicular to the paper will be referred to as the width direction.

As shown in FIG. 1, the floor structure 10 has a floor 12, an inner wall 16 rising from the periphery of the floor 12, and beams (not shown) that support the floor 12 on the ground.

A space under the floor 12 is formed to ventilate the space under the floor 12. Air flows into this space from outside the building, ventilating the space under the floor 12.

As shown in FIG. 1, the exterior wall structure 20 includes an exterior wall body 24 having an air vent V that opens outward for underfloor ventilation, an opening forming section 30 that is attached to the exterior wall body 24 so as to cover the air vent V from the outside and has an opening X that communicates with the air vent V, a restricting member 32 for restricting the flow of water through the air vent V, a support section 33 that supports the restricting member 32 rotatably between a first position α and a second position β, an elastic body 37 that biases the restricting member 32 from the second position β toward the first position α, and an extension section 31 for suppressing water from entering the air vent V from above.

In this embodiment, multiple ventilation holes V are provided along the width direction as described below, and opening forming portions 30, restricting members 32, support portions 33, elastic bodies 37, and extension portions 31 are provided corresponding to the multiple ventilation holes V.

As shown in FIG. 1, the exterior wall body 24 has a foundation 22 rising from the ground, an exterior wall 26 supported by the foundation 22, and a plurality of spacers 25 arranged in the width direction and interposed between the exterior wall 26 and the upper surface of the foundation 22 so as to form a space (vent V) between the exterior wall 26 and the foundation 22. The exterior wall 26 has a mounting member 264 rising from the upper surface of the foundation 22 and supported by the foundation 22, and an exterior wall panel 262 attached to the outer surface of the mounting member 264.

The mounting member 264 is a member for mounting the exterior wall panel 262, and is supported on the upper surface of the foundation 22 via a number of spacers 25. In this embodiment, as shown in FIG. 1, a C-shaped steel frame is used as the mounting member 264. The exterior wall panel 262 is attached to the mounting member 264 with the mounting member 264 covering the mounting member 264 from the outside and with an intra-wall ventilation passage A formed between the mounting member 264 and the exterior wall panel 262.

As shown in FIG. 1, the ventilation holes V are formed between the lower end of the mounting member 264 and the upper surface of the foundation 22 in order to connect the underfloor space to the outside of the building 1 and ventilate the underfloor space. Note that multiple ventilation holes V are provided along the width direction, and these multiple ventilation holes V are each formed between adjacent spacers 25, 25 between the lower end of the mounting member 264 and the upper surface of the foundation 22.

As shown in FIG. 2, the opening forming part 30 is a member for forming an opening X that communicates with the ventilation opening V, and is provided for each of the multiple ventilation openings V. As shown in FIG. 1, the opening forming part 30 is attached to the exterior wall main body 24 so that it covers each ventilation opening V from the outside and the opening X communicates with the ventilation opening V (and also communicates with the intra-wall ventilation passage A in this embodiment).

As shown in FIG. 1, the lower end of the opening forming part 30 is located below the upper end of the foundation 22 in a side view. A sealant 300 is provided between the inner surface of the lower end of the opening forming part 30 and the outer surface of the upper end of the foundation 22, and this sealant 300 restricts the passage of water through the gap between the opening forming part 30 and the foundation 22. In addition, when the opening forming part 30 is installed, the opening X is formed above the lower end of the opening forming part 30 and the vent V.

The restricting member 32 includes a restricting body 320 having a shape capable of covering the entire opening X of the opening forming part 30 from the outside in order to restrict the intrusion of water through the ventilation opening V when the water level rises due to a flood or the like, and a first sealing member 38 that prevents water from intruding into the ventilation opening V through the top of the restricting member 32 when the restricting member 32 is in the second position β.

As shown in FIG. 2, the restrictor body 320 is rotatably supported by a support portion 33 that extends outward from the opening forming portion 30.

As shown in FIG. 2, the first seal member 38 is provided along the upper end of the inner surface of the regulating member 32 so as to be sandwiched between the upper end of the regulating member 32 and the upper edge of the opening X in the opening forming portion 30 when the regulating portion main body 320 is rotated to the second position β.

The support portion 33 movably supports the restricting member 32 with respect to the exterior wall main body 24 on the outside of the exterior wall main body 24 so that the restricting member 32 is displaced from a first position α, which allows gas to flow through the ventilation opening V (opening X), to a second position β, which restricts water from entering the interior from the outside through the ventilation opening V (opening X) by receiving a force from the water when the water level outside the exterior wall main body 24 reaches a predetermined water level.

The support portion 33 also supports the regulating member 32 so that the regulating member 32 can be displaced from the first position α to the second position β while permitting the flow of gas above the regulating member 32, while restricting the intrusion of water at a water level below a predetermined water level from the outside of the regulating member 32 to the inside of the regulating member 32.

Specifically, as shown in FIG. 2, the support portion 33 has a bottom portion 34 extending outward from the opening forming portion 30, a positioning portion 35 rising upward from the outer end of the bottom portion 34 and positioning the restricting member 32 so as to restrict the restricting member 32 from moving away from the second position β when the restricting member 32 is in the first position α, a second seal member 39 provided across the restricting member 32 and the positioning portion 35, and a water stop member 50 that restricts water from entering the opening X through the side (width direction) of the restricting member 32.

The bottom 34 supports the regulating member 32 from below. Specifically, the regulating member 32 is placed on the bottom 34.

Here, the regulating member 32 is supported by the support portion 33 in a state in which it can rotate around a rotation axis extending in the width direction by the bottom portion 34 and the positioning portion 35. Specifically, the positioning portion 35 rises upward from the outer end of the bottom portion 34 and is connected to the regulating member 32 via the second seal member 39. The second seal member 39 is a tape that extends in the width direction over the entire width of the regulating member 32 and has water-stopping properties. The second seal member 39 also has a first portion 39a attached to the outer surface of the lower end of the regulating member 32, a second portion 39b attached to the inner surface of the positioning portion 35, and a folded portion 39c formed between the first portion 39a and the second portion 39b. The folded portion 39c constitutes a rotation axis extending in the width direction along the lower end of the regulating member 32. In addition, the second seal member 39 restricts the intrusion of water through between the lower end of the regulating member 32 and the upper surface of the bottom portion 34.

The positioning unit 35 positions the regulating member 32 in the first attitude α so that the radially outer end of the rotation axis of the regulating member 32 is located above the rotation axis. Specifically, the positioning unit 35 and the regulating member 32 are connected to each other by an elastic body 37, which is a tension spring arranged above the rotation axis. In other words, when no external force is applied to the regulating member 32, the regulating member 32 is biased by the elastic body 37 in a direction in which the upper end of the regulating member 32 approaches the positioning unit 35. The rotation position of the regulating member 32 that is pulled up the most by the elastic body 37 is the first attitude α.

The extension portion 31 prevents rainwater from entering the opening X of the opening forming portion 30. The extension portion 31 extends outward from the opening forming portion 30 so as to cover the opening X. Specifically, as shown in FIG. 2, the extension portion 31 has an outer extension portion 31a that extends outward from an upper position of the opening X in the opening forming portion 30, and a lower extension portion 31b that extends downward from the outer end of the outer extension portion 31a to cover the opening X from the outside. The outer extension portion 31a is provided under the exterior wall panel 262, and a sealing member 54 is provided between the upper surface of the outer extension portion 31a and the lower surface of the exterior wall panel 262. The sealing member 54 is made of a sealing material or a packing, and prevents water from entering the vent V from the outside of the exterior wall 26.

The lower end of the lower extension 31b is located below the upper end of the positioning portion 35, as shown in FIG. 2. This prevents rainwater from entering the inside from the outside beyond the regulating member 32. The lower extension 31b also extends below the support portion 33. Furthermore, a downward opening Y through which gas can flow is formed between the lower extension 31b and the outer surface of the positioning portion 35. When the regulating member 32 is displaced to the first position α, the underfloor space is connected to the outside through the downward opening Y, the space between the upper end of the regulating member 32 and the outer extension 31a of the extension 31, the opening X, and the vent V, as shown in FIG. 1.

In addition, the end surface 35a in the width direction of the positioning portion 35 is provided on the bottom 34 at a position spaced apart from the ends of the opening forming portion 30, the extension portion 31, and the bottom 34 in the width direction (direction perpendicular to the paper surface of FIG. 1) by a predetermined distance (specifically, the thickness of the fitting portion 53) as shown in FIG. 3 in order to secure a space for fitting the fitting portion 53 of the water-stopping member 50 described later to the opening forming portion 30, the extension portion 31, and the bottom 34. Similarly, the end surface 32a in the width direction of the regulating member 32 is supported on the bottom 34 at a position spaced apart from the ends of the opening forming portion 30, the extension portion 31, and the bottom 34 in the width direction (direction perpendicular to the paper surface of FIG. 1) by a predetermined distance (specifically, the thickness of the fitting portion 53) as shown in FIG. 3 in order to secure a space for fitting the fitting portion 53 of the water-stopping member 50 described later to the opening forming portion 30, the extension portion 31, and the bottom 34. These end surfaces 32a and 35a are arranged on the same plane.

The water-stopping member 50 covers the restricting member 32 from the side and supports the restricting member 32 so that it can be displaced between the first attitude α and the second attitude β while restricting the flow of water between the restricting member 32 and the restricting member 32. As shown in FIG. 3, the water-stopping member 50 closes the opening formed by the opening forming portion 30, the restricting member 32, and the bottom portion 34 and opens to the side in order to suppress the intrusion of water through the sides in the width direction (width direction) of the restricting member 32. Specifically, the water-stopping member 50 has a fitting portion 53 that fits inside the opening forming portion 30, the extension portion 31, and the bottom portion 34 and is in close contact with the outer surface of the opening forming portion 30, the end surface 32a of the restricting member 32, the upper surface of the bottom portion 34, and the end surface 35a of the positioning portion 35, and a clamped portion 52 that is clamped between the adjacent extension portion 31.

The clamped portion 52 has a shape that can cover the extension portion 31 from the widthwise side.

The fitting portions 53 protrude from the clamped portion 52 on both sides in the width direction to fit into the insides of the two sets of opening forming portions 30, 30, extension portions 31, 31, and bottom portions 34, 34 that are adjacent in the width direction. One fitting portion 53 fits into the insides of one opening forming portion 30, extension portion 31, and bottom portion 34, and the other fitting portion 53 fits into the insides of the other opening forming portion 30, extension portion 31, and bottom portion 34.

The water-stopping member 50 is preferably made of a material having elasticity, such as EPT (ethylene propylene rubber), to ensure close contact between the opening forming portion 30, the restricting member 32, and the bottom portion 34.

The elastic body 37 biases the regulating member 32 toward the first attitude α. The elastic body 37 is a tension spring that connects the inner surface of the positioning portion 35 and the outer surface of the regulating member 32 to bias the regulating member 32 outward. The elastic body 37 has an elastic force that allows the regulating member 32 to move from the first attitude α to the second attitude β under water pressure from the outside when the actual water level reaches a predetermined water level that is set as a height position below the height position of the upper end (the radially outer end of the rotating shaft) of the regulating member 32 in the first attitude α. More specifically, since the elastic body 37 biases the regulating member 32 toward the first attitude α, the elastic force of the elastic body 37 becomes larger as it approaches the second attitude β. Therefore, the elastic force of the elastic body 37 is set so that the regulating member 32 can reach the second attitude β when the water level reaches the predetermined water level.

The operation of the restricting member 32 is described below.

When the water level rises due to a flood or the like, the water rises to the outside of the regulating member 32 through the downward opening Y between the lower extension 31b and the outer surface of the positioning portion 35. At this time, if the water level is below a predetermined water level, the regulating member 32 is held in the first position α by the elastic force of the elastic body 37.

In this state, the intrusion of water through the side of the restricting member 32 is restricted by the fitting portion 53 of the water-stopping member 50 being in close contact with the opening forming portion 30, the restricting member 32, and the bottom portion 34. In addition, the intrusion of water between the restricting portion main body 320 and the bottom portion 34 is restricted by the second seal member 39 being provided across the positioning portion 35 and the restricting member 32.

When the water level rises further and approaches the predetermined water level, the regulating member 32 rotates about the pivot axis formed by the folded portion 39c of the second seal member 39 and is pushed inward, and reaches the second position β when the water level reaches the predetermined water level. Even during the process in which the regulating member 32 is displaced from the first position α to the second position β, the intrusion of water through the sides of the regulating member 32 is restricted by the water-stopping member 50.

In the second position β of the restricting member 32, as shown in FIG. 2, the restricting member 32 is in close contact with the upper part of the opening X in the opening forming part 30. Specifically, the first seal member 38 is sandwiched between the upper end of the restricting part main body 320 and the outer surface of the opening forming part 30. This restricts the intrusion of water into the ventilation hole V (opening X) through between the restricting part main body 320 and the opening forming part 30.

When the water level outside the building 1 drops while the restricting member 32 is in the second position β, the force of the water (water pressure) acting on the restricting member 32 from outside the building 1 decreases. When the water pressure acting on the restricting member 32 from outside the building 1 becomes smaller than the elastic force of the elastic body 37 when the restricting member 32 is in the second position β, the elastic force of the elastic body 37 displaces the restricting member 32 from the second position β to the first position α. Then, air is allowed to flow through the ventilation hole V.

(Action and Effect)
According to the exterior wall structure 20 of this embodiment, the regulating member 32 is supported so as to be displaceable from the first position α to the second position β in a state in which the intrusion of water from the outside of the regulating member 32 to the inside of the regulating member 32 is restricted while allowing the flow of gas above the regulating member 32. Therefore, during the period until the water level outside the building 1 rises due to a flood or the like and the regulating member 32 is subjected to the force of water from outside the building 1 and displaces from the first position α to the second position β, it is possible to suppress the intrusion of water into the interior of the building 1 through the regulating member 32 while ensuring the ventilation performance of the ventilation opening V.

Furthermore, the elastic body 37 has an elastic force that allows the regulating member 32 to move from the first position α to the second position β when the water level reaches a predetermined water level that is set in advance as a height position below the height position of the upper end of the regulating member 32 in the first position α, so that the regulating member 32 can be displaced to the second position β before the water level exceeds the height position of the upper end of the regulating member 32. Therefore, it is possible to prevent foreign objects floating in the water from exceeding the height position of the upper end of the regulating member 32 and entering the building side of the regulating member 32. Therefore, by preventing foreign objects from entering between the regulating member 32 and the exterior wall main body 24, the regulating member 32 can be reliably displaced to the second position β as the water level rises, and the intrusion of water into the inside of the building can be effectively suppressed. In addition, when the water level outside the building 1 drops while the regulating member 32 is in the second position β, the elastic force of the elastic body 37 can return the regulating member 32 from the second position β to the first position α.

In addition, since the position of the regulating member 32 in the first attitude α is determined by the positioning unit 35, the amount of displacement of the regulating member 32 between the first attitude α and the second attitude β can be kept constant. Therefore, the elastic force required for the regulating member 32 to be displaced from the first attitude α to the second attitude β can be appropriately set.

In addition, because the regulating member 32 is supported so as to be rotatable, a force acts to rotate the regulating member 32 around the rotation axis as the water level rises. At this time, the closer the water surface is to the radially outer end of the regulating member 32, the larger the force moment becomes. Therefore, when the regulating member 32 is in the second position β as the water level rises, water can be more effectively prevented from entering the interior.

In addition, since the regulating member 32 is positioned so that the radially outer end of the rotation axis of the regulating member 32 is located above the rotation axis when the regulating member 32 is in the first position α, it is possible to prevent foreign objects from being interposed between the regulating member 32 and the building 1 before the water level reaches the predetermined water level.

In addition, by forming an opening X in the opening forming section 30 that is provided to cover the ventilation hole V, ventilation performance can be ensured, and by closing the opening X with the regulating member 32 displaced to the second position β, the intrusion of water through the ventilation hole V can be restricted. In addition, by providing a support section 33 in this opening forming section 30, the structure that supports the regulating member 32 so that it can be displaced from the first position α to the second position β while restricting the intrusion of water from the outside to the inside of the regulating member 32 and allowing the flow of gas above the regulating member 32 can be integrated into the opening forming section 30, resulting in a simple structure.

In addition, by forming an opening X in the opening forming part 30 that is provided to cover the ventilation hole V, ventilation performance is ensured, and by providing an extension part 31 on this opening forming part 30, it is possible to prevent rainwater from entering the ventilation hole V. Therefore, the structure that can prevent rainwater from entering by attaching the opening forming part 30 provided with the extension part 31 to the exterior wall main body can be consolidated in the opening forming part 30, resulting in a simple structure.

The restricting member 32 is supported so that it can be displaced between the first position α and the second position β while covered by the water-stopping member 50 that covers the restricting member 32 from the side. This makes it possible to prevent water from entering the restricting member 32 from the side toward the building 1 when the restricting member 32 rotates due to the force of the water as the water level rises.

(Modification)
The above-described embodiments are merely illustrative of preferred specific examples of the present invention, and the present invention is not limited to the above-described embodiments.

In the above embodiment, the vent V is formed between the exterior wall 26 and the foundation 22, but the position where the vent V is formed is not limited to between the exterior wall 26 and the foundation 22. For example, the vent V may be formed in the foundation 22 so as to penetrate the foundation 22 and communicate between the inside and outside of the building.

In the above embodiment, the restricting member 32 having the first seal member 38 is used, but the first seal member 38 of the restricting member 32 can be omitted. In this case, in order to restrict the intrusion of water between the restricting member 32 and the opening forming portion 30, it is preferable that the restricting member 32 or the opening forming portion 30 is made of a flexible material.

In the above embodiment, in the second position β of the regulating body 320, the upper end of the regulating body 320 is inclined with respect to the contact surface with the regulating body 320 in the opening forming part 30, but the upper end of the regulating body 320 does not need to be inclined with respect to the contact surface. For example, the shape of at least one of the regulating body 320 and the opening forming part 30 can be adjusted so that the upper end of the regulating body 320 and the contact surface of the opening forming part 30 are parallel to each other when the regulating body 320 is rotated to the second position β. In this case, the contact area between the upper end of the regulating body 320 and the contact surface of the opening forming part 30 can be made larger than when the contact surface of the regulating body 320 and the opening forming part 30 is inclined, and the intrusion of water into the opening X through the top of the regulating member 32 can be more effectively restricted.

In the above embodiment, the restricting member 32 is described as being displaced from the first position α to the second position β by rotating around the rotation axis, but the manner of displacement of the restricting member 32 is not limited to this. For example, as shown in FIG. 4, the restricting member 32 may be supported by the support portion 33 so as to be slidable inward and outward between the first position γ in which the restricting member 32 is spaced outward from the outer wall main body 24 and the second position δ in which the restricting member 32 is in close contact with the outer surface of the opening forming portion 30 to close the opening X. In this case, the restricting member 32 is biased toward the first position γ by the elastic body 37, and is pressed inward by the water pressure as the water level on the outside rises. Then, before the water level on the outside exceeds a predetermined water level, the restricting member 32 starts to slide from the first position γ to the second position δ, and the opening X is closed by reaching the second position δ at the stage when the water level reaches the predetermined water level. This restricts the intrusion of water into the ventilation opening V. As shown in FIG. 4, the first seal member 38 may be formed in an annular shape large enough to surround the periphery of the opening X and provided on the inner surface of the regulating member 32. As shown in FIG. 4, the second seal member 39 may be a seal member attached to the lower surface of the regulating member 32 so as to be slidable against the bottom 34 and to follow the regulating member 32. Although the first seal member 38 and the second seal member 39 are provided separately, the functions of both seal members 38 and 39 may be provided in one member. For example, by adding a portion that can slide against the bottom 34 as the regulating member 32 moves to the lower part of the first seal member 38, the functions of both seal members 38 and 39 can be provided in one member.

In the above embodiment, a tension spring that connects the inner surface of the positioning portion 35 and the outer surface of the regulating member 32 is used as the elastic body 37, but the elastic body 37 is not limited to a tension spring as long as it can bias the regulating member 32 from the second position β to the first position α. For example, the elastic body 37 may be a pressure spring that connects the outer surface of the opening forming portion 30 and the inner surface of the regulating member 32 and biases the regulating member 32 outward, or rubber or other elastic bodies may be used instead of a spring.

Needless to say, various design modifications are possible within the scope of the present invention.

Reference Signs List 1 Building 20 Exterior wall structure 21 Exterior wall main body 22 Foundation 26 Exterior wall 30 Opening forming portion 31 Extension portion 32 Restricting member 33 Support portion 34 Bottom portion 35 Positioning portion 37 Elastic body 38 First sealing member 39 Second sealing member 50 Water-stopping member 52 Clamped portion 53 Fitting portion A In-wall ventilation passage V Vent α First position β Second position

Claims (6)

An exterior wall structure,
An exterior wall body having an exterior wall and a foundation supporting the exterior wall and having a vent opening opening outward for underfloor ventilation;
a restricting member for restricting the flow of water through the ventilation hole;
a support portion that movably supports the restricting member with respect to the exterior wall main body on the outside of the exterior wall main body so as to be displaced from a first position that allows the flow of gas through the ventilation hole to a second position that restricts the intrusion of water from the outside of the building to the inside of the building through the ventilation hole by receiving a force from water when the water level outside the exterior wall main body reaches a predetermined water level;
an elastic body including a spring that urges the regulating member in the second position toward the first position,
the support portion supports the regulating member such that the regulating member is displaceable from the first position to the second position in a state in which water below the predetermined water level is prevented from entering from the outside of the regulating member to the inside of the regulating member while allowing gas to flow over the regulating member,
An exterior wall structure, wherein the elastic body has an elastic force that allows the regulating member to move from the first position to the second position when the water level reaches the predetermined water level that is preset as a height position below the height position of the upper end of the regulating member in the first position. The exterior wall structure according to claim 1,
An exterior wall structure, wherein the support portion has a positioning portion that positions the regulating member so as to regulate the movement of the regulating member in the first posture in a direction away from the second posture. In the exterior wall structure according to claim 2,
the support portion further includes a rotation shaft for rotatably supporting the regulating member such that the regulating member is displaceable between the first position and the second position,
An outer wall structure, wherein the positioning portion positions the regulating member such that, when the regulating member is in the first posture, a radially outer end of the regulating member on the pivot shaft is positioned above the pivot shaft. In the exterior wall structure according to any one of claims 1 to 3,
The ventilation hole is attached to the exterior wall body so as to cover the ventilation hole from the outside, and further includes an opening forming portion having an opening communicating with the ventilation hole,
An exterior wall structure in which the support portion extends outward from the opening forming portion and supports the regulating member so that it is displaced from a first position that allows gas to flow through the opening to a second position that regulates the intrusion of water from the outside of the building to the inside of the building through the opening. The exterior wall structure according to claim 4,
The exterior wall structure further includes an extension portion extending from the opening forming portion so as to cover the opening in the opening forming portion from above to prevent water from entering the opening from above. In the exterior wall structure according to any one of claims 1 to 5,
The support portion further includes a water-stopping member that covers the regulating member from the side and supports the regulating member so that the regulating member can be displaced between the first position and the second position while restricting the flow of water between the regulating member and the support portion.