Outer wall structure

Abstract

To provide an exterior wall structure capable of effectively suppressing water intrusion into a building during a flood or the like.SOLUTION: In order to solve the above problems, the exterior wall structure of the present invention includes an exterior wall body, a regulating member, a support portion, and an elastic body. The support portion supports the regulating member so that the regulating member can be displaced from a first posture to a second posture in a state in which water below a predetermined water level is restricted from entering from the outside of the regulating member to the inside of the regulating member, and gas is allowed to flow through the top of the regulating member. The elastic body has an elastic force that allows the regulating member to move from the first posture to the second posture when the water level reaches the predetermined water level preset as a height position equal to or lower than the height position of an upper end portion of the regulating member in the first posture.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an outer wall structure for suppressing the intrusion of water through a ventilation opening formed in an outer wall body.

Background Art

[0002] Conventionally, in order to suppress flooding inside a structure during a flood, a base drain as described in Patent Document 1 is known. This base drain allows ventilation of the outer wall and under the floor through the outer wall ventilation opening and the under-floor ventilation opening, and when the water level outside the building rises due to a flood or the like, it covers the outer wall ventilation opening and the under-floor ventilation opening from the outside to regulate the intrusion of water into the interior through the outer wall ventilation opening and the under-floor ventilation opening.

[0003] Specifically, the base drain includes a drain part member including a drain part main body disposed on the outdoor side of a wooden house rather than both the outer wall ventilation opening and the under-floor ventilation opening, and a receiving member that covers the outer wall ventilation opening and the under-floor ventilation opening from the outside and has a downward opening that opens downward, and a water stop valve rotatably provided about an axis parallel to the width direction of the outer wall between a position where the downward opening is opened and a position where it is closed.

[0004] In the open position, the tip (outdoor-side end) of the water stop valve is located below the base end (indoor-side end). The water stop valve is pushed by the water pressure received from the outdoor side into the drain part and closes the downward opening. Thereby, it is possible to regulate the intrusion of water into the interior through the outer wall ventilation opening and the under-floor ventilation opening even during a flood or the like.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the base drainage described in Cited Document 1, the tip (outdoor end) of the water stop valve is located below the base end (indoor end) in the open position of the water stop valve. For this reason, during the rotation of the water stop valve, there is a risk that foreign matter floating as the water level rises will be caught between the drainage member and the water stop valve. If foreign matter intervenes between the drainage member and the water stop valve, the downward opening cannot be blocked, and it is impossible to regulate the intrusion of water into the interior through the outer wall ventilation opening and the underfloor ventilation opening.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide an outer wall structure capable of effectively suppressing the intrusion of water into a building during a flood or the like.

Means for Solving the Problems

[0008] In order to solve the above problems, the outer wall structure of the present invention has an outer wall and a foundation that supports the outer wall, and an outer wall body formed with a ventilation opening that opens outward for underfloor ventilation, a regulating member for regulating the flow of water through the ventilation opening, and a first posture that allows the flow of gas through the ventilation opening. When the water level outside the outer wall body reaches a predetermined water level, the regulating member is supported movably with respect to the outer wall body outside the outer wall body so as to be displaced from the first posture to a second posture that restricts the intrusion of water from the outside of the building into the building through the ventilation opening by receiving the force from the water, and the regulating member in the second posture is biased toward the first posture Including a spring an elastic body, and the support portion supports the regulating member so that the regulating member can be displaced from the first posture to the second posture while allowing the flow of gas through above the regulating member while restricting the intrusion of water less than the predetermined water level from the outside 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 posture to the second posture when the water level reaches the predetermined water level preset as a height position below the height position of the upper end portion of the regulating member in the first posture.

[0009] According to this outer wall structure, the regulating member is supported so as to be displaceable from the first posture to the second posture while allowing the flow of gas through the regulating member while restricting the intrusion of water from the outside of the regulating member to the inside of the regulating member. Therefore, until the water level outside the building rises due to a flood or the like and the regulating member is displaced from the first posture to the second posture by receiving the force of water from the outside of the building, it is possible to suppress the intrusion of water into the inside of the building while ensuring the ventilation performance of the ventilation port.

[0010] Furthermore, since the elastic body has an elastic force that allows the regulating member to move from the first posture to the second posture when the water level reaches a predetermined water level preset as a height position below the height position of the upper end portion of the regulating member in the first posture, the regulating member can be displaced to the second posture prior to the water level exceeding the height position of the upper end portion of the regulating member. Therefore, it is possible to suppress foreign matter floating in the water from intruding into the building side of the regulating member beyond the height position of the upper end portion of the regulating member. For this reason, by suppressing foreign matter from entering between the regulating member and the outer wall body, it is possible to surely displace the regulating member to the second posture as the water level rises, and effectively suppress the intrusion of water into the building interior. Also, when the water level outside the building drops while the regulating member is in the second posture, the elastic force of the elastic body can return the regulating member from the second posture to the first posture.

[0011] In the outer wall structure, it is preferable that the support portion has a positioning portion that positions the regulating member so as to restrict the movement of the regulating member in a direction away from the second posture in the first posture of the regulating member.

[0012] According to this configuration, since the position of the regulating member in the first posture is positioned by the positioning portion, the displacement amount of the regulating member between the first posture and the second posture can be made constant. Therefore, the elastic force required for the regulating member to be displaced from the first posture to the second posture can be appropriately set.

[0013] In the outer wall structure, the support portion further has a rotation axis for rotatably supporting the restricting member so that the restricting member can be displaced between the first posture and the second posture, and the positioning portion is such that, when the restricting member is in the first posture, the radially outer end portion of the restricting member at the rotation axis is preferably positioned above the rotation axis so as to position the restricting member.

[0014] According to this configuration, since the restricting member is rotatably supported, a force acts to rotate the restricting member around the rotation axis as the water level rises. At this time, the closer the water surface approaches the radially outer end portion of the restricting member, the greater this force becomes. Therefore, when the restricting member is in the second posture as the water level rises, water intrusion into the interior can be more effectively suppressed.

[0015] Also, since the restricting member is positioned such that the radially outer end portion of the restricting member at the rotation axis is positioned above the rotation axis when the restricting member is in the first posture, the presence of foreign matter between the restricting member and the building can be suppressed at a stage before the water level reaches a predetermined water level.

[0016] The outer wall structure is attached to the outer wall main body so as to cover the ventilation opening from the outside, and further includes an opening forming portion in which an opening communicating with the ventilation opening is formed. The support portion extends outward from the opening forming portion and preferably supports the restricting member so as to be displaced from a first posture allowing gas flow through the opening to a second posture restricting water intrusion from the outside of the building into the interior of the building through the opening.

[0017] According to this configuration, ventilation performance can be ensured by forming an opening in the opening forming portion provided so as to cover the ventilation port, and intrusion of water through the ventilation port can be restricted by closing the opening with the restricting member displaced to the second posture. Further, by providing a support portion in this opening forming portion, the configuration is integrated in the opening forming portion so that the restricting member can be supported so as to be displaceable from the first posture to the second posture while restricting the intrusion of water from the outside to the inside of the restricting member and allowing the flow of gas through above the restricting member, and a simple configuration can be achieved.

[0018] It is preferable that the outer wall structure further has an extending portion extending from the opening forming portion so as to cover the opening in the opening forming portion from above so as to suppress the intrusion of water from above into the opening.

[0019] According to this configuration, an opening is formed in the opening forming portion provided so as to cover the ventilation port, and by providing an extending portion in this opening forming portion, the intrusion of rainwater into the ventilation port can be suppressed. Therefore, the configuration for preventing the intrusion of rainwater through the ventilation port can be integrated in the opening forming portion by attaching the opening forming portion provided with the extending portion to the outer wall main body, and a simple configuration can be achieved.

[0020] In the outer wall structure, it is preferable that the support portion further has a water stop member that supports the restricting member so as to be displaceable between the first posture and the second posture while covering the restricting member from the side and restricting the flow of water between the restricting member and the restricting member.

[0021] According to this configuration, the restricting member is supported by the water stop member that covers the restricting member from the side so as to be displaceable between the first posture and the second posture in a state where the restricting member is covered from the side. For this reason, when the restricting member rotates due to the force of water as the water level rises, it is possible to suppress the intrusion of water from the side of the restricting member to the building side of the restricting member.

Advantages of the Invention

[0022] As described above, according to the outer wall structure of the present invention, it is possible to effectively suppress the intrusion of water into the building interior during floods and the like.

Brief Explanation of Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0024] Hereinafter, with reference to the accompanying drawings, the building 1 to which the present invention is applied will be described. Note that the following embodiments are examples embodying the present invention and do not have the character of limiting the technical scope of the present invention. Also, in the present embodiment, a wooden building is used as the building 1, but the building to which the present invention is applied is not limited to the wooden building 1, and other buildings such as a reinforced concrete building or a lightweight steel frame building may be used.

[0025] As shown in FIG. 1, the building 1 of the present embodiment has an outer wall structure 20 and a floor structure 10 provided inside the outer wall structure 20. Hereinafter, the right side of the drawing of FIG. 1 will be described as the inner side (inside the building 1), the left side of the drawing as the outer side (outside the building 1), and the direction orthogonal to the drawing as the width direction.

[0026] 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 a bundle (not shown) that supports the floor 12 on the ground.

[0027] Under the floor 12, a sub-floor space for ventilating under the floor 12 is formed. Air flows into this sub-floor space from the outside of the building, thereby ventilating under the floor 12.

[0028] As shown in Fig. 1, the outer wall structure 20 includes an outer wall main body 24 in which a ventilation opening V that opens to the outside is formed for under-floor ventilation, an opening forming portion 30 that is attached to the outer wall main body 24 so as to cover the ventilation opening V from the outside and in which an opening X communicating with the ventilation opening V is formed, a regulating member 32 for regulating the flow of water through the ventilation opening V, a support portion 33 that rotatably supports the regulating member 32 between a first posture α and a second posture β, an elastic body 37 that biases the regulating member 32 from the second posture β toward the first posture α, and an extending portion 31 for suppressing the intrusion of water from above into the ventilation opening V.

[0029] In this embodiment, a plurality of ventilation openings V are provided along the width direction as will be described later. Corresponding to these plurality of ventilation openings V, an opening forming portion 30, a regulating member 32, a support portion 33, an elastic body 37, and an extending portion 31 are respectively provided.

[0030] As shown in Fig. 1, the outer wall main body 24 includes a foundation 22 rising from the ground, an outer wall 26 supported by the foundation 22, and a plurality of spacers 25 interposed between the outer wall 26 and the upper surface of the foundation 22 so that a space (ventilation opening V) is formed between the outer wall 26 and the foundation 22 and arranged along the width direction. The outer wall 26 includes a mounting member 264 rising from the upper surface of the foundation 22 and supported by the foundation 22, and an outer wall panel 262 attached to the outer surface of the mounting member 264.

[0031] The mounting member 264 is a member for attaching the outer wall panel 262 and is supported on the upper surface of the foundation 22 via a plurality of spacers 25. In this embodiment, as shown in Fig. 1, a C-shaped steel formed in a frame shape is used as the mounting member 264. The outer wall panel 262 is attached to the mounting member 264 in a state where it covers the mounting member 264 from the outside and a wall-in ventilation passage A is formed between the outer wall panel 262 and the mounting member 264.

[0032] As shown in FIG. 1, the ventilation port V is formed between the lower end of the mounting member 264 and the upper surface of the foundation 22 to communicate the underfloor space with the outside of the building 1 and ventilate the underfloor. A plurality of ventilation ports V are provided along the width direction, and these plurality of ventilation ports V are respectively formed between adjacent spacers 25, 25 between the lower end of the mounting member 264 and the upper surface of the foundation 22.

[0033] As shown in FIG. 2, the opening forming portion 30 is a member for forming an opening X communicating with the ventilation port V, and is provided for each of the plurality of ventilation ports V. As shown in FIG. 1, the opening forming portion 30 covers each ventilation port V from the outside and is attached to the outer wall main body 24 so that the opening X communicates with the ventilation port V (also communicates with the in-wall ventilation passage A in this embodiment).

[0034] As shown in FIG. 1, the lower end of the opening forming portion 30 is located below the upper end of the foundation 22 in a side view. A sealing material 300 is provided between the inner side surface of the lower end of the opening forming portion 30 and the outer side surface of the upper end of the foundation 22, and the sealing material 300 restricts the passage of water through the gap between the opening forming portion 30 and the foundation 22. Further, in the mounted state of the opening forming portion 30, the opening X is formed above the lower end of the opening forming portion 30 and the ventilation port V.

[0035] The restricting member 32 includes a restricting portion main body 320 having a shape capable of covering the entire opening X of the opening forming portion 30 from the outside to restrict the intrusion of water through the ventilation port V in a state where the water level has risen due to a flood or the like, and a first sealing member 38 that suppresses the intrusion of water into the ventilation port V through above the restricting member 32 when the restricting member 32 is in the second posture β.

[0036] As shown in FIG. 2, the restricting portion main body 320 is rotatably supported by a support portion 33 extending outward from the opening forming portion 30.

[0037] 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 rotates to the second posture β.

[0038] The support portion 33 supports the regulating member 32 movably with respect to the outer wall main body 24 outside the outer wall main body 24 so as to displace from the first posture α allowing the flow of gas through the vent V (opening X) to the second posture β restricting the intrusion of water from the outside to the inside through the vent V (opening X) by receiving the force from the water when the water level outside the outer wall main body 24 reaches a predetermined water level.

[0039] Further, the support portion 33 supports the regulating member 32 so that the regulating member 32 can be displaced from the first posture α to the second posture β while restricting the intrusion of water at a water level below a predetermined water level from the outside to the inside of the regulating member 32 and allowing the flow of gas through above the regulating member 32.

[0040] Specifically, as shown in FIG. 2, the support portion 33 includes 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 regulating member 32 so as to restrict the movement of the regulating member 32 in a direction away from the second posture β in the first posture α of the regulating member 32, a second seal member 39 provided across the regulating member 32 and the positioning portion 35, and a water stop member 50 restricting the intrusion of water into the opening X through the side (width direction) of the regulating member 32.

[0041] The bottom portion 34 supports the regulating member 32 from below. Specifically, the regulating member 32 is placed on the bottom portion 34.

[0042] Here, the regulating member 32 is supported by the support portion 33 in a rotatable state about 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 portion 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 across the entire width of the regulating member 32 and has a water-stopping performance. Further, the second seal member 39 has a first portion 39a adhered to the outer surface of the lower end portion of the regulating member 32, a second portion 39b adhered to the inner surface of the positioning portion 35, and a folded-back portion 39c formed between the first portion 39a and the second portion 39b. The folded-back portion 39c constitutes a rotation axis extending in the width direction along the lower end of the regulating member 32. Also, the entry of water through between the lower end portion of the regulating member 32 and the upper surface of the bottom portion 34 is regulated by the second seal member 39.

[0043] In the first posture α of the regulating member 32, the positioning portion 35 positions the regulating member 32 such that the end portion on the radially outer side of the rotation axis of the regulating member 32 is located above the rotation axis. Specifically, the positioning portion 35 and the regulating member 32 are connected to each other by an elastic body 37 which is a tension spring disposed above the rotation axis. That is, in a situation where 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 portion of the regulating member 32 approaches the positioning portion 35. The rotation position of the regulating member 32 most pulled up by the elastic body 37 is the first posture α.

[0044] The extending portion 31 suppresses rainwater from entering the opening X of the opening forming portion 30. The extending portion 31 extends outward from the opening forming portion 30 so as to cover the opening X. Specifically, as shown in FIG. 2, the extending portion 31 has an outer extending portion 31a that extends outward from above the opening X in the opening forming portion 30, and a lower extending portion 31b that extends downward from the outer end of the outer extending portion 31a to cover the opening X from the outside. The outer extending portion 31a is provided under the outer wall panel 262, and a sealing member 54 is provided between the upper surface of the outer extending portion 31a and the lower surface of the outer wall panel 262. The sealing member 54 is composed of a sealing material or packing, and prevents water from entering the vent V from the outside of the outer wall 26.

[0045] As shown in FIG. 2, the lower end of the lower extending portion 31b is located below the upper end of the positioning portion 35. Therefore, it is possible to suppress rainwater from entering the inside from the outside beyond the regulating member 32. Further, the lower extending portion 31b extends below the support portion 33. Furthermore, a downward opening Y through which gas can flow is formed between the lower extending portion 31b and the outer surface of the positioning portion 35. In a state where the regulating member 32 is displaced to the first posture α, the underfloor space communicates with the outside through the downward opening Y, between the upper end of the regulating member 32 and the outer extending portion 31a of the extending portion 31, the opening X, and the vent V, as shown in FIG. 1.

[0046] Note that, as shown in FIG. 3, the end surface 35a in the width direction of the positioning portion 35 is provided on the bottom portion 34 at a position spaced a predetermined distance (specifically, the thickness of the fitting portion 53) from the end portions in the width direction (the direction perpendicular to the plane of FIG. 1) of the opening forming portion 30, the extending portion 31, and the bottom portion 34 in order to secure a space for fitting the fitting portion 53 of the water stop member 50 described later to the opening forming portion 30, the extending portion 31, and the bottom portion 34. Similarly, the end surface 32a in the width direction of the regulating member 32 is supported on the bottom portion 34 at a position spaced a predetermined distance (specifically, the thickness of the fitting portion 53) from the end portions in the width direction (the direction perpendicular to the plane of FIG. 1) of the opening forming portion 30, the extending portion 31, and the bottom portion 34 in order to secure a space for fitting the fitting portion 53 of the water stop member 50 to the opening forming portion 30, the extending portion 31, and the bottom portion 34. These end surfaces 32a and 35a are arranged on the same plane.

[0047] The water stop member 50 covers the restricting member 32 from the side and supports the restricting member 32 so as to be displaceable between the first posture α and the second posture β while restricting the flow of water between the restricting member 32. As shown in FIG. 3, the water stop member 50 is formed by the opening forming portion 30, the restricting member 32, and the bottom portion 34 to close an opening that opens to the side in order to suppress the intrusion of water through the side in the width direction (width direction) of the restricting member 32. Specifically, the water stop member 50 fits inside the opening forming portion 30, the extending portion 31, and the bottom portion 34, and has a fitting portion 53 that 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 sandwiched portion 52 that is sandwiched between adjacent extending portions 31.

[0048] The sandwiched portion 52 has a shape that can cover the extending portion 31 from the side in the width direction.

[0049] The fitting portion 53 protrudes from both sides in the width direction from the sandwiched portion 52 in order to fit inside each of two sets of adjacent opening forming portions 30, 30, extending portions 31, 31, and bottom portions 34, 34 in the width direction. One fitting portion 53 fits inside one opening forming portion 30, extending portion 31, and bottom portion 34, and the other fitting portion 53 fits inside the other opening forming portion 30, extending portion 31, and bottom portion 34.

[0050] The water stop member 50 is preferably formed of a material having an elastic force, such as EPT (ethylene propylene rubber), in order to ensure the adhesion between the opening forming portion 30, the restricting member 32, and the bottom portion 34.

[0051] The elastic body 37 biases the restricting member 32 toward the first posture 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 restricting member 32 in order to bias the restricting member 32 outward. The elastic body 37 is set to a predetermined water level that is equal to or lower than the height position of the upper end portion (the end portion radially outside the rotation axis) of the restricting member 32 in the first posture α. When the actual water level reaches the predetermined water level, the elastic body 37 has an elastic force that allows the restricting member 32 to move from the first posture α to the second posture β under the water pressure from the outside. More specifically, since the elastic body 37 biases the restricting member 32 toward the first posture α, the elastic force of the elastic body 37 increases as it approaches the second posture β. Therefore, the elastic force of the elastic body 37 is set so that the restricting member 32 can reach the second posture β when the water level reaches the predetermined water level.

[0052] Hereinafter, the operation of the restricting member 32 will be described.

[0053] When the water level rises due to a flood or the like, water rises up to the outside of the restricting member 32 through the downward opening Y between the lower extending portion 31b and the outer surface of the positioning portion 35. At this time, if the water level is lower than the predetermined water level, the restricting member 32 is held in the first posture α by the elastic force of the elastic body 37.

[0054] 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 stop member 50 being in close contact with the opening forming portion 30, the restricting member 32, and the bottom portion 34. Further, the intrusion of water between the restricting member main body 320 and the bottom portion 34 is restricted by the second sealing member 39 being provided across the positioning portion 35 and the restricting member 32.

[0055] As the water level further rises and approaches the predetermined water level, the restricting member 32 rotates around the rotation axis formed by the folded-back portion 39c of the second sealing member 39 and is pushed inward, and reaches the second posture β when the water level reaches the predetermined water level. Even in the process of the restricting member 32 being displaced from the first posture α to the second posture β, the intrusion of water through the side of the restricting member 32 is restricted by the water stop member 50.

[0056] In the second posture 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 portion 30. Specifically, the first sealing member 38 is in a state of being sandwiched between the upper end portion of the restricting member main body 320 and the outer surface of the opening forming portion 30. Thereby, the intrusion of water into the vent V (opening X) through the space between the restricting member main body 320 and the opening forming portion 30 is restricted.

[0057] When the water level outside the building 1 drops while the restricting member 32 is in the second posture β, the water force (water pressure) acting on the restricting member 32 from the outside of the building 1 becomes smaller. When the water pressure acting on the restricting member 32 from the outside of the building 1 becomes smaller than the elastic force of the elastic body 37 when the restricting member 32 is in the second posture β, the restricting member 32 is displaced from the second posture β to the first posture α by the elastic force of the elastic body 37. And the air flow through the vent V is allowed.

[0058] (Function and effect) According to the outer wall structure 20 of the present embodiment, the restricting member 32 is supported so as to be displaceable from the first posture α to the second posture β while restricting the intrusion of water from the outside of the restricting member 32 to the inside of the restricting member 32 and allowing the gas flow through the upper part of the restricting member 32. For this reason, until the water level outside the building 1 rises due to a flood or the like and the restricting member 32 is displaced from the first posture α to the second posture β by receiving the water force from the outside of the building 1, it is possible to suppress the intrusion of water into the building 1 through the restricting member 32 while ensuring the ventilation performance of the vent V.

[0059] Furthermore, since the elastic body 37 has an elastic force that allows the regulating member 32 to move from the first posture α to the second posture β when the water level reaches a predetermined water level preset as a height position below the height position of the upper end of the regulating member 32 in the first posture α, the regulating member 32 can be displaced to the second posture β prior to the water level exceeding the height position of the upper end of the regulating member 32. Thus, it is possible to suppress foreign matter floating in the water from entering the building side of the regulating member 32 beyond the height position of the upper end of the regulating member 32. For this reason, by suppressing foreign matter from entering between the regulating member 32 and the outer wall body 24, it is possible to reliably displace the regulating member 32 to the second posture β as the water level rises, and effectively suppress water from entering the building interior. Also, when the water level outside the building 1 drops while the regulating member 32 is in the second posture β, the regulating member 32 can be returned from the second posture β to the first posture α by the elastic force of the elastic body 37.

[0060] Also, since the position of the regulating member 32 is positioned by the positioning portion 35 in the first posture α, the displacement amount of the regulating member 32 between the first posture α and the second posture β can be made constant. For this reason, the elastic force required until the regulating member 32 is displaced from the first posture α to the second posture β can be appropriately set.

[0061] Also, since the regulating member 32 is rotatably supported, a force acts to rotate the regulating member 32 around the rotation axis as the water level rises. At this time, the moment of the force increases as the water surface approaches the radially outer end of the regulating member 32. Thus, when the water level rises and the regulating member 32 is in the second posture β, it is possible to more effectively suppress water from entering the interior.

[0062] Also, since the regulating member 32 is positioned such that the radially outer end at the rotation axis of the regulating member 32 is located above the rotation axis in the state where the regulating member 32 is in the first posture α, it is possible to suppress the presence of foreign matter between the regulating member 32 and the building 1 before the water level reaches the predetermined water level.

[0063] In addition, by forming the opening X in the opening forming portion 30 provided so as to cover the ventilation port V, ventilation performance can be ensured, and by closing the opening X with the restricting member 32 displaced to the second posture β, intrusion of water through the ventilation port V can be restricted. Further, by providing the support portion 33 in the opening forming portion 30, the restricting member 32 is supported so as to be displaceable from the first posture α to the second posture β in a state where intrusion of water from the outside to the inside of the restricting member 32 is restricted while allowing gas to flow through above the restricting member 32, and the configuration can be integrated into the opening forming portion 30 to achieve a simple configuration.

[0064] In addition, while ensuring ventilation performance by forming the opening X in the opening forming portion 30 provided so as to cover the ventilation port V, by providing the extending portion 31 in this opening forming portion 30, intrusion of rainwater into the ventilation port V can be suppressed. Therefore, the configuration that rainwater intrusion can be prevented by attaching the opening forming portion 30 provided with the extending portion 31 to the outer wall main body can be integrated into the opening forming portion 30 to achieve a simple configuration.

[0065] Further, the restricting member 32 is supported by the water stop member 50 that covers the restricting member 32 from the side so as to be displaceable between the first posture α and the second posture β in a state where the restricting member 32 is covered from the side. For this reason, when the restricting member 32 rotates due to the force of water as the water level rises, intrusion of water from the side of the restricting member 32 to the building 1 side of the restricting member 32 can be suppressed.

[0066] (Modification example) The above embodiment merely illustrates a preferred specific example of the present invention, and the present invention is not limited to the above embodiment.

[0067] In the above embodiment, the ventilation port V was formed between the outer wall 26 and the foundation 22, but the position where the ventilation port V is formed is not limited to between the outer wall 26 and the foundation 22. For example, the ventilation port V may be formed in the foundation 22 so as to communicate the inside and outside of the building through the foundation 22.

[0068] In the above embodiment, the restricting member 32 having the first sealing member 38 is used, but the first sealing member 38 of the restricting member 32 can be omitted. In this case, in order to restrict the intrusion of water through 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.

[0069] In the above embodiment, in the second posture β of the restricting portion main body 320, the upper end portion of the restricting portion main body 320 was inclined with respect to the contact surface with the opening forming portion 30 in the restricting portion main body 320, but the upper end portion of the restricting portion main body 320 does not necessarily have to be inclined with respect to the contact surface. For example, in a state where the restricting portion main body 320 is rotated to the second posture β, at least one of the shapes of the restricting portion main body 320 and the opening forming portion 30 can be adjusted so that the upper end portion of the restricting portion main body 320 and the contact surface of the opening forming portion 30 are parallel to each other. In this case, the contact area between the upper end portion of the restricting portion main body 320 and the contact surface of the opening forming portion 30 can be made larger than in the case where the contact surface between the restricting portion main body 320 and the opening forming portion 30 is inclined, and the intrusion of water into the opening X through above the restricting member 32 can be restricted more effectively.

[0070] In the above-described embodiment, the regulating member 32 that is displaced from the first posture α to the second posture β by rotating around the rotation axis has been described. However, the mode of displacement of the regulating member 32 is not limited to this. For example, as shown in FIG. 4, the regulating member 32 may be supported by the support portion 33 so as to be slidable in the inner and outer directions between the first posture γ spaced apart from the outer wall main body 24 and the second posture δ that closes the opening X by being in close contact with the outer surface of the opening forming portion 30. In this case, the regulating member 32 is biased toward the first posture γ by the elastic body 37 and is pressed inward by water pressure as the water level on the outside rises. Then, the slide from the first posture γ toward the second posture δ is started before the water level on the outside exceeds a predetermined water level, and the opening X is closed by reaching the second posture δ when the water level reaches the predetermined water level. Thereby, the intrusion of water into the vent V is restricted. Further, as the first seal member 38, as shown in FIG. 4, an annular one having a size capable of surrounding the periphery of the opening X and provided on the inner surface of the regulating member 32 can be adopted. Furthermore, as the second seal member 39, as shown in FIG. 4, a seal member attached to the lower surface of the regulating member 32 so as to be slidable with respect to the bottom portion 34 and capable of following the regulating member 32 can be applied. Although the first seal member 38 and the second seal member 39 have been described as being provided individually, the functions of both the seal members 38 and 39 may be provided in one member. For example, by adding a portion that can slide on the bottom portion 34 as the regulating member 32 moves to the lower portion of the first seal member 38 described above, the functions of both the seal members 38 and 39 can be provided in one member.

[0071] In the above-described embodiment, as the elastic body 37, a tension spring that connects the inner surface of the positioning portion 35 and the outer surface of the regulating member 32 is used. However, the elastic body 37 is not limited to a tension spring as long as it can bias the regulating member 32 from the second posture β toward the first posture α. For example, as the elastic body 37, a compression 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 may be used, or rubber or other elastic bodies may be used instead of the spring.

[0072] Needless to say, various design changes are possible within the scope of the claims of the present invention.

Explanation of Reference Numerals

[0073] 1 Building 20 Outer Wall Structure 21 Outer Wall Body 22 Foundation 26 Outer Wall 30 Opening Forming Portion 31 Extension Portion 32 Regulation Member 33 Support Portion 34 Bottom Portion 35 Positioning Portion 37 Elastic Body 38 First Seal Member 39 Second Seal Member 50 Waterstop Member 52 Clamped Portion 53 Fitting Portion A Wall Inner Ventilation Passage V Vent α First Posture β Second Posture

Claims

1. An outer wall structure, comprising an outer wall main body having an outer wall and a foundation for supporting the outer wall, and having a ventilation opening formed on the outside for underfloor ventilation; a regulating member for regulating the flow of water through the ventilation opening; a support portion that movably supports the regulating member on the outside of the outer wall main body with respect to the outer wall main body so as to displace from a first posture allowing the flow of gas through the ventilation opening to a second posture that restricts the intrusion of water from the outside of the building into the inside of the building through the ventilation opening by receiving the force from water when the water level outside the outer wall main body reaches a predetermined water level; and an elastic body including a spring that biases the regulating member in the second posture toward the first posture, wherein the support portion supports the regulating member in a state allowing the flow of gas through above the regulating member while restricting the intrusion of water below the predetermined water level from the outside of the regulating member to the inside of the regulating member, so that the regulating member can be displaced from the first posture to the second posture; The elastic body has an elastic force that allows the regulating member to move from the first posture to the second posture when the water level reaches the predetermined water level preset as a height position below the height position of the upper end portion of the regulating member in the first posture. An outer wall structure.

2. In the outer wall structure according to Claim 1, the support portion has a positioning portion that positions the regulating member so as to restrict the movement of the regulating member in a direction away from the second posture in the first posture of the regulating member. An outer wall structure.

3. In the outer wall structure according to Claim 2, the support portion further has a rotation shaft for rotatably supporting the regulating member so that the regulating member can be displaced between the first posture and the second posture. The positioning portion positions the regulating member such that, in a state where the regulating member is in the first posture, an end portion on the radially outer side of the rotation axis of the regulating member is positioned above the rotation axis, the outer wall structure.

4. In the outer wall structure according to any one of claims 1 to 3, An opening forming portion is further provided which is attached to the outer wall main body so as to cover the ventilation port from the outside and in which an opening communicating with the ventilation port is formed, The support portion extends outward from the opening forming portion and supports the regulating member so as to be displaced from a first posture allowing the flow of gas through the opening to a second posture regulating the intrusion of water from the outside of the building into the building through the opening, the outer wall structure.

5. In the outer wall structure according to claim 4, The outer wall structure further has an extending portion extending from the opening forming portion so as to cover the opening from above in the opening forming portion so as to suppress the intrusion of water from above into the opening.

6. In the outer wall structure according to any one of claims 1 to 5, The support portion further has a water stop member that covers the regulating member from the side and supports the regulating member so as to be displaceable between the first posture and the second posture while regulating the flow of water between the support portion and the regulating member, the outer wall structure.

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