JP7300301B2 - Underfloor ventilation system and house equipped with this underfloor ventilation system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor ventilation system and a house equipped with the underfloor ventilation system, and more particularly, to an underfloor ventilation system and this underfloor ventilation system that can prevent water from entering through an underfloor ventilation hole, thereby suppressing flood damage. It relates to a house with

BACKGROUND ART In recent years, heavy rain caused by typhoons, torrential rains, and the like have caused floods, which often cause great damage to houses. When such a flood or the like occurs, water enters through the underfloor ventilation holes provided in the foundation, causing damage such as underfloor flooding or above-floor flooding.

As means for preventing water from entering through such an underfloor ventilation hole, the following has been proposed. This relates to the "underfloor flood prevention structure", and an air passage that communicates with the underfloor ventilation hole and circulates air between the underfloor space and the outside space is formed. A buoyancy body floating in the water stopped by a water stop portion that dams the inflowing water automatically closes the air flow passage (see Patent Document 1).

Japanese Patent No. 4727756

By the way, underfloor ventilation is a very important factor in suppressing underfloor humidity, suppressing the growth of mold and termites, and thus improving the durability of a house. However, in the structure disclosed in Patent Document 1, not only is the entrance of the air passage blocked by the floating body an extremely narrow space, but also the space (passage) blocked by the floating body is Structurally, it is essential that the above-mentioned entrance is formed above the position where it is formed, and the opening area of this blocked space (passage) must be extremely narrow, so floods, etc. The ventilation function is considerably restricted during normal times when there is no flooding, and by adopting such an underfloor flood prevention structure, the durability of the house is rather reduced. By the way, the Japan Housing Finance Agency, an independent administrative agency, has adopted measures to give preferential treatment to home buyers in terms of housing loan conditions and loan interest rates as part of its "Support System for Acquisition of Quality Homes." The conditions for housing that can be built are stipulated in the "Housing Standard Technology Implementation Detailed Regulations." In addition, this standard states that ``the underfloor part of the outer wall ... must have ventilation holes with an effective area of 300 square centimeters or more'' (page 6: Second securitization support housing Technical standards, 1 Standards for new housing, (6) Measures for ensuring durability of housing, B Structure of housing, (a) c). When trying to meet these standards with the structure disclosed in Patent Document 1, the floating body is also required from the structural point of view that the air passage blocked by the floating body is located inside the foundation of the house. The space (passage) blocked by the will be reduced.

Therefore, the present invention has been proposed to solve the above-described problems of the prior art, and is capable of automatically preventing water from entering through an underfloor ventilation hole. To provide an underfloor ventilation system capable of not only effectively preventing underfloor flooding, but also effectively exerting the functions of ventilation and dehumidification by the underfloor ventilation holes without diminishing these functions, and this underfloor. The purpose is to provide a house with a ventilation system.

DISCLOSURE OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, and a first invention (invention according to claim 1) relates to an underfloor ventilation system, and is a house in which an underfloor ventilation hole is formed. At least a water tank support member attached to the base of the water tank support member, a bottom plate supported by the water tank support member, and three side plate portions, and the air or water flowing in through the underfloor ventilation hole a water tank having an inflow space into which water flows; an opening for opening and closing formed above a bottom plate portion constituting the water tank; and a floating valve that closes the open/close opening from the lower side when the water reaches a predetermined height.

In the underfloor ventilation system according to the first aspect of the invention described above, the underfloor space and the outside space of the house communicate with each other through the underfloor ventilation hole, the inflow space, and the opening for opening and closing during normal times when floods do not occur, The underfloor ventilation function and moisture-proof function of the house are guaranteed. On the other hand, when a flood occurs due to torrential rain or the like and water flows in from the underfloor ventilation hole, this water flows into the water tank from the inflow space formed in the water tank. When the floating valve floats and the water level in the water tank rises due to an increase in water volume, the opening/closing opening is automatically closed from below by the floating valve. Closure of the open/close opening by such a floating valve prevents further water from flowing into the inside of the foundation (into the underfloor space).

In particular, in the underfloor ventilation system according to the present invention, the open/close opening that is closed by the floating valve in the event of a flood or the like is located under the floor. In addition, since the air passage blocked by the floating body (floating valve constituting the present invention) is not located in the underfloor ventilation hole formed in the foundation, the floating valve constituting the present invention blocks the air passage The area of the open/close opening and the area of the inflow space formed in the water tank can be freely designed without being affected by the area of the underfloor ventilation hole. Therefore, according to the present invention, when water enters from the underfloor ventilation holes, it is possible not only to automatically prevent the water from entering, but also to prevent flooding due to torrential rain or the like in normal times. These functions can be effectively exhibited without hindering the underfloor ventilation function and moisture-proof function by the underfloor ventilation holes up to.

The underfloor ventilation system according to the first aspect of the invention comprises a water tank support member, a water tank, and a floating valve, respectively. As long as it is attached to the base of the water tank and has the function of supporting the water tank, it may have any shape or structure, for example, it is formed as a frame (see claim 2) Alternatively, it may consist of a single or a plurality of metal fittings or the like, and the metal fittings or the like may support the water tank. Also, the water tank support member may be fixed to the base portion, for example, the inner side surface (inner wall) of the base portion. Further, the water tank support member may be attached or fixed to the foundation after the concrete foundation having the underfloor ventilation holes is formed. In the stage prior to molding with concrete, the water tank support member is fixed to the mold used for molding, and then integrated with the cast concrete (see claim 3). good. The water tank is supported by the water tank support member and positioned at a position slightly separated from the inner surface of the base, and has at least a bottom plate and three side plates, and the underfloor ventilation hole. Any shape or structure may be used as long as it has an inflow space into which the air or water that has flowed through passes through. In addition, the height of the bottom plate portion that constitutes the water tank may be, for example, flush with the lowest formation surface for forming the underfloor ventilation holes, or may be above the lowest formation surface. Further, it may be formed below the lowermost molding surface. Further, the floating valve may have a function of closing the open/close opening from below when the water stored in the water tank reaches a predetermined height. It is not limited. Further, the relationship between the water tank and the opening/closing opening may be such that the opening/closing opening is formed in the water tank, or the water tank is constituted by a water tank main body and a lid. Alternatively, the opening for opening and closing may be formed in the lid.

In a second invention (invention of claim 2), in the first invention, the underfloor ventilation holes are formed by four hole-forming surfaces, and the water tank support member has the four holes on the outside. A frame formed with opposing surfaces opposed to two hole- forming surfaces, respectively, and a circulation space formed therein for air or water circulation, wherein the circulation space and the inflow formed in the water tank Space is characterized by being connected to each other.

In the underfloor ventilation system according to the second aspect of the invention, the water tank supporting member is a frame having a facing surface facing the four hole forming surfaces on the outside. In other words, the frame, which is the water tank support member, is mounted inside the underfloor ventilation hole. On the outside of the frame, which is the water tank support member, there is formed a facing surface facing the four hole- forming surfaces, and on the inside, a circulation space through which air or water flows is formed. and the inflow space formed in the water tank communicate with each other. Therefore, according to the second aspect of the present invention, water in the event of a flood flows into the water tank through the circulation space and the inflow space formed in the frame that is the water tank support member. It is possible to effectively prevent the risk of water leaking into the underfloor space during the process of flowing into the water tank.

In addition, in the underfloor ventilation device according to the second aspect of the present invention, as described above, the communication structure or communication between the circulation space formed in the water tank support member (frame body) and the inflow space formed in the water tank As for the mode, it is sufficient that these openings communicate with each other, and a waterproof material or other member having a waterproof function may be interposed between the circulation space and the inflow space. The water tank support member (frame body) has a surface facing the four hole-forming surfaces that form the underfloor ventilation holes. It is not limited to one that faces all the surfaces, and may face a part of the four formation surfaces (for example, the formation surface from the middle part to the underfloor space side).

In a third invention (invention according to claim 3), in the second invention, the water tank supporting member is a frame body having a top plate portion, a bottom plate portion, a left side plate portion, and a right side plate portion. This frame is fixed at a predetermined position in a stage prior to forming the foundation with concrete. A plurality of long ribs facing each other are formed, and the underfloor ventilation hole of the house serves as the circulation space formed inside the frame.

In the underfloor ventilation system according to the third aspect of the present invention, first, the frame as the water tank supporting member is fixed at a predetermined position before the foundation is molded from concrete. That is, when the foundation portion is formed of concrete, a plurality of reinforcing bars are arranged by welding or the like at the predetermined locations, and then a predetermined frame material is arranged so as to sandwich the reinforcing bars. After going through the process of filling and placing concrete between the frame material, the frame as the above-mentioned water tank support member is formed in predetermined places (underfloor ventilation holes are formed in the stage before forming the foundation part with the above-mentioned concrete. position) and then fixed to the foundation by filling and placing concrete. A top plate portion, a bottom plate portion, a left side plate portion, and a right side plate portion are formed in the frame body fixed in such a process, and the underfloor ventilation holes are formed on the outer surfaces of the top plate portion and the bottom plate portion. A plurality of ribs having a length in the longitudinal direction and facing each other are formed. Accordingly, the filled concrete is also filled between the ribs and then hardened. Therefore, the frame as a water tank support member constituting the underfloor ventilation system according to the third invention is integrated with concrete by the above process, and the underfloor ventilation hole is formed inside the frame. It becomes the above-mentioned circulation space.

Therefore, according to the underfloor ventilation system according to the third aspect of the present invention, the concrete positioned outside the top plate portion and the bottom plate portion and between the respective ribs can ensure watertightness. It is possible to effectively prevent the risk of water leaking into the underfloor space through between the molding surfaces forming the underfloor ventilation holes and the upper and lower surfaces of the frame.

In a fourth invention (invention of claim 4), in the third invention, the bottom plate portion constituting the water tank support member is formed in a rectangular shape, and the side plate constituting the water tank support member Each section stands upright from the end of the bottom plate section, and guides a floating valve that moves upward or downward in accordance with changes in the water level in the water tank in the inflow space formed in the water tank. It is characterized in that a plurality of guide members are formed.

In the underfloor ventilation system according to the fourth aspect of the invention, one or more guide members are formed to guide the floating valve that moves upward or downward in accordance with changes in the water level in the water tank. , when it moves upward as the water level rises in the water tank, it is guided by the side plate portion and the guide member, respectively. In addition, even when the flood subsides and the water level in the water tank gradually drops and the floating valve, which until then blocks the open/close opening, drops as the water level drops, the floating valve remains in contact with the guide member. It is moved downward while being guided, and finally placed on the bottom plate that constitutes the water tank. Therefore, according to the fourth aspect of the present invention, it is possible to effectively prevent a situation in which water flows into the underfloor space through the open/close opening without accurately closing the open/close opening due to the floating valve being tilted or the like. In addition, even when the flood subsides and the water level in the water tank drops, the floating valve can be reliably returned to its original position (on the bottom plate) without tilting, and Also, it is possible to prevent the floating valve from flowing out of the water tank due to the lowering of the water level.

Further, according to a fifth invention (invention according to claim 5), in any one of the first, second, third, or fourth inventions, the floating valve is a rectangular plate, A plurality of supporting projections are formed on the upper surface of the bottom plate portion constituting the water tank to support the floating valve at the upper end.

In the underfloor ventilation system according to the fifth aspect of the present invention, the upper surface of the bottom plate portion constituting the water tank is formed with a plurality of supporting projections for supporting the floating valve at the upper end. The water that has flowed inside first flows into the lower side of the floating valve on both sides of the supporting projection, then the water level gradually rises, and the floating valve moves upward as the water level rises. . Therefore, according to the fifth aspect of the invention, even if water flows into the water tank vigorously or abruptly, the floating valve can always close the open/close opening.

The size and height of each supporting projection are not particularly limited as long as they have the function of supporting the floating valve at the upper end. Of course, it may be formed into a ridge. When each of the supporting protrusions is formed as a ridge, the ridge preferably has a length in the water inflow direction, and the height of the ridge is gradually increased in the water inflow direction. It is preferably molded short. Alternatively, the bottom plate portion constituting the water tank is inclined so that the height gradually increases in the water inflow direction, and the height of the ridges is gradually shortened in the water inflow direction. The height of may be horizontal. When each supporting projection is formed as such a projection, water flows into the lower side of the floating valve from both sides of each projection. In particular, when the inclined bottom plate is used as a component, it becomes possible to drain the water in the water tank as the flood subsides and the water level decreases.

Further, according to a sixth invention (invention according to claim 6), in any one of the second, third, fourth or fifth inventions, a frame as the water tank support member and the water tank Both or either one of them has fixing means for fixing the frame and the water tank, and either the back of the frame or the front of the water tank has elasticity. An endless groove filled with a water stop material and a pressure contact plate portion with which the water stop material filled in the groove is pressed against each other are relatively formed, and the fixing means fixes the frame and the water tank. are fixed, the water stop material is pressed by the pressure contact plate portion.

In the underfloor ventilation system according to the sixth aspect of the invention, the endless groove filled with an elastic water-stopping material such as caulking material and the water-stopping material filled in the groove are pressed together. The recess and the pressure contact plate portion may be formed relative to either the back surface of the frame or the front surface of the water tank. That is, when the recessed line is formed on the back surface of the frame, the pressure contact plate portion is formed on the front surface of the water tank, and conversely, when the recessed line is formed on the front surface of the water tank. , the pressure contact plate portion may be formed on the rear surface of the frame. By fixing the frame and the water tank by the fixing means, the water stop material is pressed by the pressing plate portion.

Therefore, according to the sixth aspect of the present invention, the risk of water leaking to the outside (underfloor space) from between the frame and the water tank during or during the flow of water from the frame to the water tank is eliminated. can be effectively prevented.

Further, according to a seventh invention (an invention according to claim 7), in any one of the second, third, fourth, fifth, or sixth inventions, the back surface of the frame serving as the water tank supporting member is At either the lower end side or the lower end side of the front surface of the water tank, an arc-shaped rotation guide portion and a fixed shaft portion supported by the arc-shaped rotation guide portion, or the arc-shaped rotation guide The entire water tank is supported by the rotation guide portion while the fixed shaft portion is supported by the rotation guide portion, or the fixed shaft portion is supported by the rotation guide portion. It is characterized in that it is fixed to the water tank supporting member by a fixing means after being rotated while being supported.

In the underfloor ventilation system according to the seventh aspect, when the water tank is fixed to the frame that is the water tank support member, first, the entire water tank is placed in a state in which the fixed shaft portion is supported by the rotation guide portion. Alternatively, the rotation guide portion is supported by a fixed shaft , and then the entire water tank is rotated about the fixed shaft portion, and then the water tank is moved to the water tank by the fixing means. It can be fixed to the support member.

Therefore, according to the underfloor ventilation system according to the seventh aspect of the present invention, when fixing the water tank to the frame as the water tank support member, it is possible to fix the water tank to a very simple, quick and accurate position without requiring skill. The water tank can be fixed at a fixed position, and the risk of water leakage or the like caused by being fixed at an incorrect position can be effectively prevented.

An eighth invention (invention according to claim 8) relates to a house, and is characterized by comprising the underfloor ventilation system according to any one of claims 1 to 7. .

According to the house according to the eighth invention, when water enters from the underfloor ventilation hole, it is possible to automatically prevent the water from entering the underfloor space, and the ventilation function by the underfloor ventilation hole It is possible to construct a house that can effectively exhibit these functions without reducing the dehumidification function.

According to the underfloor ventilation system according to the first invention (invention of claim 1), when water enters from the underfloor ventilation holes, it is possible not only to automatically prevent the water from entering, Underfloor ventilation function and moisture-proof function can be effectively exhibited in normal times when flooding due to torrential rain or the like does not occur.

In addition, according to the underfloor ventilation system according to the second invention (claim 2), water in the event of a flood passes through the circulation space and the inflow space formed in the frame that is the water tank support member. Therefore, since the water flows into the water tank, it is possible to effectively prevent the risk of the water leaking into the underfloor space during the process of flowing into the water tank.

In addition, according to the underfloor ventilation system according to the third invention (claim 3), watertightness is ensured by the concrete positioned outside the top plate portion and the bottom plate portion and between the respective ribs. Thus, it is possible to effectively prevent the risk of water leaking into the underfloor space through between the molding surfaces for forming the underfloor ventilation holes made of concrete and the upper and lower surfaces of the frame.

Further, according to the underfloor ventilation system according to the fourth aspect of the invention (invention of claim 4), the floating valve does not tilt or the like to accurately block the opening and closing opening, and the water flows through this opening and closing opening. It is possible to effectively prevent the situation of flowing into the underfloor space, and even when the flood subsides and the water level in the water tank decreases, the floating valve can be reliably returned to its original position without tilting. (on the bottom plate), and the risk of the floating valve flowing out of the water tank due to the lowering of the water level can be prevented.

In addition, according to the underfloor ventilation system according to the fifth invention (invention of claim 5), even if water flows into the water tank vigorously or suddenly, the floating valve ensures that the above-mentioned opening for opening and closing is opened. can be occluded.

In addition, according to the underfloor ventilation system according to the sixth invention (invention of claim 6), in the process or in the middle of the flow of water from the frame to the water tank, the water flows from between the frame and the water tank. is effectively prevented from leaking to the outside (underfloor space).

Further, according to the underfloor ventilation system according to the seventh invention (claim 7), when fixing the water tank to the frame as the water tank support member, it is very easy and does not require skill. , the water tank can be quickly and accurately fixed at a predetermined position, and the risk of water leakage caused by an incorrectly fixed position can be effectively prevented.

In addition, according to the eighth invention (invention of claim 8), in the same way as in any one of the first to seventh inventions, when water enters from the underfloor ventilation hole, the Not only is it possible to prevent the intrusion of water, but it is also possible to effectively exhibit the underfloor ventilation function and the moisture-proof function during normal times when flooding due to torrential rain or the like does not occur.

1 is a plan view of an underfloor ventilation system according to a first embodiment of the present invention; FIG. Fig. 2 is a side view of the underfloor ventilation system shown in Fig. 1; It is a front view of the water-storage-tank support member which comprises an underfloor ventilation apparatus. 4 is a rear view of the water tank support member shown in FIG. 3; FIG. Fig. 3 is an enlarged cross-sectional view of a main part showing a state in which a water tank supporting member and a water tank are fixed; It is front sectional drawing which shows a water tank. It is a front view which shows a water-tank main body. It is a top view which shows a water-tank main body. It is a rear view which shows a water-tank main body. It is the right side which fracture|ruptures and shows some water tanks. It is a top view which shows a lid. FIG. 4 is a front view showing a state in which the water tank supporting member is fixed to the foundation; It is a side view which shows typically the process of filling a water tank with a caulking material. It is a side view which shows typically the process of fixing a water tank to a water tank support member. It is a side view which shows typically the state just before fixing to a water tank and a water tank support member. It is a cross-sectional perspective view which shows typically the normal state of an underfloor ventilation system. FIG. 4 is a cross-sectional perspective view schematically showing a state in which an opening for opening and closing is closed by a floating valve; FIG. 7 is an exploded perspective view showing an underfloor ventilation system according to a second embodiment of the present invention; FIG. 19 is a side sectional view showing the underfloor ventilation device shown in FIG. 18; FIG. 11 is an exploded perspective view showing an underfloor ventilation system according to a third embodiment of the present invention; FIG. 21 is a side sectional view showing the underfloor ventilation device shown in FIG. 20;

BEST MODE FOR CARRYING OUT THE INVENTION Below, the underfloor ventilation system according to the best mode for carrying out the present invention will be specifically described in detail with reference to the drawings, and then the house provided with this underfloor ventilation system will be described. First, the underfloor ventilation system 1 according to the first embodiment will be described.

As shown in FIG. 1 or FIG. 2, the underfloor ventilation system 1 according to this embodiment includes a water tank supporting member 2, a water tank 3 supported and fixed to the water tank supporting member 2 on the back side, It is composed of a floating valve 4. The water tank support member 2 is made of synthetic resin and has a length in the left-right direction (horizontal direction) as shown in FIG. It is a formed frame. 1 or 2, a left side plate portion 22 (see FIG. 1) hanging down from the left side of the top plate portion 21, A right side plate portion 23 (see FIG. 2) that hangs down from the right side of the plate portion 21 and faces the left side plate portion 22, and a bottom plate portion 24 that faces the top plate portion 21, A space closed by the top plate portion 21, the left side plate portion 22, the right side plate portion 23, and the bottom plate portion 24 is a circulation space A through which the air or water flows. The outside surfaces of the top plate portion 21, the left side plate portion 22, the right side plate portion 23, and the bottom plate portion 24 are four hole-forming surfaces forming underfloor ventilation holes 11a formed in the base portion 11, which will be described later. It is a facing surface facing to. The left side plate portion 22 and the right side plate portion 23 are slightly inclined from the front side to the rear side so as to approach each other. Further, the bottom plate portion 24 is provided with the top plate from the front side to the back side for the purpose of naturally draining rainwater to the outside even if rainwater intrudes into the water tank support member 2 due to wind and rain. It is slightly slanted to approach portion 21 . 1 or 2, a plurality of first upper ribs 21a extending in the longitudinal direction of the top plate portion 21 and these first upper ribs 21a are provided on the upper surface of the top plate portion 21. A second upper rib 21b having a length perpendicular to the upper rib 21a is formed on the lower surface of the bottom plate portion 24 as shown in FIG. A plurality of first lower ribs 24a having length in the direction and second lower ribs 24b having length in the direction orthogonal to the first lower ribs 25a are formed.

In addition, a plurality of louvers 5 having a length in the vertical direction (vertical direction) are rotatably supported on the front surface of the water tank support member 2, and both the upper and lower ends of the louvers 5 are attached to the top plate. It is rotatably supported on the front sides of the portion 21 and the bottom plate portion 24 . The water tank support member 2 is provided with an operation portion for opening and closing the louvers 5 and an opening/closing mechanism for opening and closing all the louvers 5 by operating the operation portion, but the description thereof is omitted. do.

As shown in FIG. 4, on the rear surface of the water tank support member 2, an upper flange portion 21c protruding upward from the top surface of the top plate portion 21 and having a slightly thick wall thickness, and the left side plate portion are provided. A left flange portion 22c that protrudes laterally from the side surface of the right plate portion 22 and is slightly thick, and a right flange portion 23c that protrudes laterally from the side surface of the right side plate portion 23 and is slightly thick, A slightly thick lower flange portion 24c protruding downward from the lower surface of the bottom plate portion 24 is formed. The upper flange portion 21c, the left flange portion 22c, the right flange portion 23c, and the lower flange portion 24c are formed in a continuous state so as to surround the circulation space A formed inside the water tank support member 2. It is a thing. On both left and right sides of the back surface of the water tank support member 2, projecting pieces 26 and 27 stand up above the upper surface of the top plate portion 21 and the upper ends of the first upper ribs 21a. , circular insertion holes 26a and 27a are formed in the centers of the projecting pieces 26 and 27, respectively. The upper flange portion 21c formed in the water tank support member 2 has a total of four screw holes 21d into which fixing screws 6 (see FIG. 5) for fixing the water tank 3 are screwed. They are formed at regular intervals.

Further, on the rear surfaces of the upper flange portion 21c, the left flange portion 22c, the right flange portion 23c, and the lower flange portion 24c, an endless insertion plate portion 7 is provided so as to surround the circulation space A. It protrudes rearward from the rear surfaces of the flange portion 22c, the right flange portion 23c, and the lower flange portion 24c. The endless insertion plate portion 7 is a portion inserted into an endless water stop material filling portion 8 which is formed on the front surface of the water tank main body 31 to be described later and is filled with a caulking material, which is a water stop material. When the water tank main body 31 is attached and fixed to the water tank support member 2 by the procedure and operation described later, the water stop material filled in the water stop material filling part 8 is A portion of the waterproof material filling portion 8 is forcibly protruded to the surroundings. Further, on the rear surface of the water tank supporting member 2, as shown in FIG. 4, three struts 9 are provided in parallel from the lower surface of the top plate portion 21 to the upper surface of the bottom plate portion 24, respectively. 5, below the position where the endless insertion plate portion 7 is formed on both the left and right sides of the back surface of the lower flange portion 24c formed in the water tank support member 2. In the recesses 24f having openings on the rear surface, arc-shaped rotation guides 10 provided in the water tank main body 31, which will be described later, are rotatably supported in the recesses 24f. The shafts 24g (shaft portions of the screws shown in FIG. 2) are fixed with their lengths in the horizontal direction.

When the foundation of the house is molded from concrete, the water tank support member 2 is used to mold the front and rear surfaces of the foundation at the positions where the underfloor ventilation holes are formed in the foundation. Positioned by using a plurality of fixtures (not shown), concrete is placed thereon, and the concrete hardens to be integrated (fixed) with the foundation as shown in FIG. is. That is, as shown in FIG. 12, predetermined reinforcing bars 12 are arranged on both the left and right sides and below the water tank support member 2, and the water tank support is provided at a position where a pre-designed underfloor ventilation hole is formed. The member 2 is fixed, and the circulation space A inside the water tank support member 2 becomes a space (underfloor ventilation hole) for circulating air and water between the outside space and the underfloor space. Projecting pieces 26 and 27 formed on the left and right sides of the back surface of the water tank support member 2 are portions used when fixing the water tank support member 2 to the respective molds with a plurality of fixtures (not shown). , and when the concrete is placed, the projecting pieces 26 and 27 are embedded in the concrete as shown in FIG.

Next, the water tank 3 will be described. 2 or 6, the water tank 3 includes a water tank main body 31, a lid body 32 fixed to the upper part of the water tank main body 31, and the above-mentioned floating valve housed in the water tank main body 31. a valve 4; The water tank body 31 and the lid body 32 are each molded from a synthetic resin. As shown in FIG. A rear side plate portion 35 standing from the rear end of the bottom plate portion 34, a left side plate portion 36 standing from the left end of the bottom plate portion 34, and a left side plate portion 36 standing from the right end of the bottom plate portion 34. and a top plate portion formed with an opening 38a formed in the center into which the outer circumference of an endless water stop member 51 formed in a substantially rectangular shape and formed on the lid body 32 described later is inserted. 38. Therefore, this water tank main body 3
1 is an inflow space B into which air or water that has passed through the circulation space A formed in the water tank support member 2 flows into the water tank main body 31 . The upper surface of the front side of the bottom plate portion 34 is positioned substantially at the same position as the upper surface of the rear end of the bottom plate portion 24 constituting the water tank support member 2. The front surface of the water tank main body 31 is arranged such that the water flowing into the water tank main body 31 passes through the circulation space A of the water tank support member 2 and finally naturally flows out to the outside of the base portion 11 . It is gradually inclined so that the height increases from the side to the back side. Further, the left side plate portion 36 and the right side plate portion 37 are slightly inclined so as to gradually separate from the lower end to the upper end.

On the upper surface of the bottom plate portion 34, as shown in FIG. 6, a plurality of supporting projections 34a and 34b are formed in parallel to support the floating valve 4 at the upper end. As shown in FIG. 10, these ridges 34a and 34b have their front ends slightly behind the front end of the bottom plate portion 34, and their heights are gradually lowered rearward. Together with the inclination angle of the bottom plate portion 34 as a whole, the upper ends of the ridges 34a and 34b are horizontal. Also, as shown in FIG. 7, from the upper surface of the front side of the bottom plate portion 34, slightly from the front side end portions of the protrusions 34a and 34b, to the lower surface of the top plate portion 38, As will be described later, it guides the front surface of the floating valve 4 which rises and falls with changes in the water level, and the floating valve 4 removes the inside of the water tank support member 2 from the inside of the water tank 3 as the water level decreases. Left and right guide plate portions 41 and 42 are provided parallel to each other to prevent the liquid from being discharged into the external space. These left and right guide plate portions 41 and 42 are guide members constituting the present invention.

7, a lower flange portion 34c hanging down from the front end of the bottom plate portion 34 and a left side plate portion 36 protruding laterally from the front end of the left side plate portion 36 are provided on the front surface of the water tank main body 31, as shown in FIG. A flange portion 36c, a right flange portion 37c protruding laterally from the front end of the right side plate portion 37, and an upper flange portion 38c protruding upward from the front end of the top plate portion 38 (a horizontal flange portion 38f to be described later). These lower flange portion 34c, left flange portion 36c, right flange portion 37c, and upper flange portion 38c are formed in a continuous state so as to surround the entire inflow space B, respectively. The upper flange portion 38c is formed to be longer than the widths of the lower flange portion 34c, the left flange portion 36c, and the right flange portion 37c. A total of four water tank side screw holes 38d into which the fixing screws 6 are screwed are formed at positions corresponding to the screw holes 21d formed in the upper flange portion 21c of the support member 2 at equal intervals. ing.

In addition, a caulking material (not shown), which is a water stopping material, is provided on the front surfaces of the continuous lower flange portion 34c, the left flange portion 36c, the right flange portion 37c, and the upper flange portion 38c and in a position close to the inflow space B. is formed so as to protrude from the front surface of each flange portion (reference numerals are omitted) toward the back side of the water tank support member 2 . The water stop material filling portion 8 is formed into a groove having an opening on the front side. Further, arc-shaped rotation guide portions 10 which are inserted into the respective recesses 25f and engage with the left and right fixed shafts 24g are formed on the front surfaces on both the left and right sides below the lower flange portion 34c. It is These left and right circular arc-shaped rotation guide portions 10 are formed slightly below the portion where the water stop material filling portion 8 is located, and their tips are formed as shown in FIG. 5 or FIG. It protrudes slightly toward the water tank support member 2 from the front surface of the water stop material filling portion 8 . It should be noted that each rotation guide portion 10 is formed with an opening (reference numerals omitted) through which the fixed shaft 24g is inserted on the rear side.

As shown in FIG. 8, the top plate portion 38 constituting the water tank main body 31 has a substantially rectangular shape as a whole, and has an area slightly larger than that of the bottom plate portion 34 inside. A body-side opening (reference numerals are omitted) having is formed. Further, the top plate portion 38 has a horizontal flange portion 38f that extends laterally (horizontally) from the upper end positions of the rear side plate portion 35, the left side plate portion 36, and the right side plate portion 37. As shown in FIG. The horizontal flange portion 38f is formed with a total of 10 screw holes 38g into which fixing screws 59 (see FIG. 1) are screwed for placing and fixing the cover 32 to the water tank main body 31, which will be described later. ing.

Next, the lid 32 fixed to the water tank main body 31 by the fixing screws 59 will be described. As shown in FIG. 1 or FIG. 11, the lid 32 includes a top plate portion 45 having a lower surface mounted on the horizontal flange portion 38f formed in the water tank main body 31 and formed into a substantially rectangular shape. 6, a left hanging portion 46 which slightly hangs down from the left end of the top plate portion 45 and whose inner surface contacts or faces the end portion of a horizontal flange portion 38f formed in the water tank main body 31, and a top plate portion. A right hanging portion 47 which hangs down slightly from the right end of the horizontal flange portion 38f and whose inner surface contacts or faces the end of the horizontal flange portion 38f, and It has a rear hanging part (not shown) whose side surfaces contact or face each other. Further, as shown in FIG. 6, inside the top plate portion 45, a rectangular opening C for opening and closing, which constitutes the present invention, is formed. The open/close opening C is a space having an area smaller than that of the floating valve 4 which moves up and down according to the change in water level. In this embodiment, the lower surface of the top plate portion 45 has an inner peripheral surface that surrounds the space slightly below the opening C, and an outer peripheral surface that has the top plate portion 38 of the water tank main body 31. A rubber-made endless waterproof member 51 is fixed to the inner end forming the main body side opening formed in the housing.

As shown in FIG. 11, the top plate portion 45 constituting the lid body 32 has screws at positions corresponding to the respective screw holes 38g formed in the top plate portion 38 of the water tank main body 31. An insertion hole 45g is formed. In addition, on the upper surface of the top plate portion 45 of the lid body 32, there is provided an upper surface of the top plate portion 45, which has a length from the front side to the back side, and straddles the opening C for opening and closing. A plurality of lid-side ribs 45h are formed. The floating valve 4 is a plate having a rectangular planar shape, and is made of a material such as styrene foam having a specific gravity lower than that of water.

As described above, the water tank support member 2 constituting the underfloor ventilation device 1 described above is an underfloor ventilation hole formed in the foundation 11 when the foundation 11 of the house is molded from concrete. A plurality of fixtures (not shown) are used to form the front and back surfaces of the base portion 11 at the formation position of 11a, and concrete is placed thereon to harden. Thus, as shown in FIG. 12, it is integrated (fixed) with the base portion 11 . Further, in the base portion 11 and below the water tank support member 2, reinforcing bars 12 are arranged on both left and right sides. Therefore, a method for attaching and fixing the water tank 3 to the water tank support member 2 fixed to the base portion 11 will be described in order of steps.

FIG. 13 shows a state in which the water tank support member 2 is fixed to the base portion 11 and a state in which the front surface of the water tank 3 faces upward. The material filling portion 8 is filled with a caulking material (not shown), which is a water stopping material. It is desirable to fill the caulking material to such an extent that it protrudes from the water stop material filling portion 8 . When the filling operation of the water stop material is completed, then, as shown in FIG. It is inserted into the concave portion 24f formed on the back side of the water tank support member 2, and the circular arc-shaped rotation guide portions 10 are engaged with the left and right fixed shafts 24g so that the left and right fixed shafts 24g are the center. Then, the entire water tank 3 is rotated (rotated counterclockwise in FIG. 14), and the lower flange portion 34c, the left flange portion 36c, the right flange portion 37c, and the The front surface of the upper flange portion 38c is brought into contact with the rear surfaces of the upper flange portion 21c, the left flange portion 22c, the right flange portion 23c, and the lower flange portion 24c formed on the rear surface of the water tank support member 2, respectively. By rotating the water tank 3, the water tank 3 can be moved to an accurate position with respect to the water tank support member 2, and by such an operation, the endless shape formed in the water tank support member 2 can be rotated. The insertion plate portion 7 is inserted into the water stop material filling portion 8 , and as a result, the water stop material filled in the water stop material filling portion 8 protrudes from the water stop material filling portion 8 . By rotating the water tank 3 in this manner, the front surface of the upper flange portion 38c formed in the water tank 3 faces the upper flange portion 21c constituting the water tank support member 2. As shown in FIG. Therefore, the fixing screws 6 are inserted through the four screw holes 38d formed in the upper flange portion 38c, and the fixing screws 6 are screwed into the respective screw holes 21d formed in the upper flange portion 21c. Thus, the work of fixing the water tank 3 to the water tank support member 2 is completed. By fixing the water tank 3 to the water tank support member 2, a circulation space A is formed inside the water tank support member 2, and an inflow space is formed in front of the water tank 3. B are in communication with each other.

The effects of the underfloor ventilation system 1 according to the above-described embodiment will be described below. In the underfloor ventilation device 1 arranged and fixed to the base part 11 in this way, the floating valve 4 is normally positioned on the bottom plate 34 of the water tank main body 31, and the underfloor space and the external space are defined as the circulation space. A, the inflow space B, and the open/close opening C formed in the lid 32 of the water tank 3 are connected to each other, so air flows through these structures. On the other hand, when the water volume increases due to a flood or the like, water passes through the circulation space A formed in the water tank support member 2, and this water flows into the water tank body 31 from the inflow space B, the bottom plate portion will continue until then. The floating valve 4 placed on 34 floats on the water and gradually rises as the water level rises (see FIG. 16). At this time, the floating valve 4 is guided by the inner side surfaces of the left side plate portion 36, the right side plate portion 37, and the like, and is guided by the left and right guide plate portions 41 and 42. As a result, the floating valve 4 rises. This prevents a situation in which the opening 9 for opening/closing is not completely closed due to inclination or the like on the way. As the water level rises, the upper surface of the floating valve 4 eventually comes into contact with the lower surface of the water stop member 51 as shown in FIG. 17, and as a result the opening C is closed. Therefore, even if the volume of water in the external space outside the base portion 11 increases, water does not enter the underfloor space. When the flood or the like subsides and the water level in the water tank main body 31 drops, the floating valve 4, which had risen until then, returns to the initial position.

Further, in the underfloor ventilation system 1 according to the above-described embodiment, the upper surface of the bottom plate portion 34 constituting the water tank 3 is formed with two projections 34a and 34b as supporting projections, and the floating valve 4 is , are supported by the upper ends of these ridges 34a and 34b, the water that has flowed into the water tank main body 31 first flows from both sides of the ridges 34a and 34b and below the floating valve 4. Therefore, even if water flows vigorously or suddenly into the water tank main body 31, the floating valve 4 ensures that the opening C is opened from below. blocked.

In addition, in the underfloor ventilator 1 according to the first embodiment, the fixed shaft portion 24g constituting the present invention is formed on the back side of the water tank support member 2, while the above-mentioned fixed shaft portion 24g is formed on the front side of the water tank 3. An arcuate rotation guide portion 10 is formed to be engaged with and supported by each fixed shaft portion 24g. The water tank 3 is moved to a predetermined position on the water tank support member 2 by locking the rotation guide portions 10 and rotating the entire water tank 3 around the fixed shafts 24g. In the present invention, the fixed shafts are formed in the water tank 3, and the fixed shafts are supported and engaged by the water tank support member 2. Alternatively, an arcuate rotation guide portion having an opening through which the fixed shaft is inserted may be provided in the upper portion thereof. Further, in the underfloor ventilation device 1 according to the first embodiment, the endless insertion plate portion 7 is formed on the back surface of the water tank support member 2, and the endless water stop material filled with the caulking material is provided. Although the filling part 8 is formed on the front surface of the water tank 3, the present invention is arranged such that the water stop material filling part is formed on the back surface of the water tank support member 2, and the endless insertion plate part is used to store water. It may be formed on the front surface of the tank 3 .

In addition, in the underfloor ventilation system 1 according to the first embodiment, the water tank support member 2 forms an underfloor ventilation hole formed in the base portion 11 of the house when the base portion 11 is formed from concrete. Positioned in position and integrated (fixed) with the base portion 11, the water tank support member constituting the present invention supports at least the water tank, and the base portion 11 is molded. It may be fixed to the base portion 11 after being attached. For example, as in the underfloor ventilation device 71 shown as the second embodiment in FIG. 18 or 19, the front shape is formed in a rectangular shape and the inside is a foundation in which the underfloor ventilation hole 11a that is the circulation space A is formed. A water tank support member 72 fixed to the inner surface of the part 11, a water tank 73 supported and fixed to the water tank support member 72, and a floating valve 74 housed in the water tank 73. is. The water tank support member 72 has an upper surface that is substantially flush with the hole-forming surface 11f formed below among the four hole-forming surfaces 11c, 11d, 11e, and 11f forming the underfloor ventilation hole 11a. It is composed of a support plate portion 75 and a fixing plate portion 76 which is bent from the tip of the support plate portion 75 and fixed to the inner surface of the base portion 11 with a water stop rubber plate 77 sandwiched therebetween. The support member 75 is a portion that supports the water tank 73 on the upper surface, and is formed with an insertion hole 75a through which the shaft portion of the bolt 78 is inserted. Further, the fixed plate portion 76 is formed with a plurality of bolt insertion holes 76a through which the shaft portions of the bolts 85 are inserted. As shown in FIG. 18, the rubber plate 77 for stopping water has an opening 77a having the same shape as the front face of the underfloor ventilation hole 11a and the inlet opening B formed in the front of the water tank 73, which will be described later. It is a formed plate. The water stop rubber plate 77 is formed with a plurality of bolt insertion holes 77b through which the shafts of the bolts 85 are inserted. The method for fixing the water tank support member 72 to the base portion 11 is to drive a plurality of anchor nuts 86 (see FIG. 19) at predetermined positions on the inner surface of the base portion 11, and these anchor nuts 86 are The shaft portion of the bolt 85 inserted through the bolt insertion hole 76a and the opening 77a is screwed into the hole 76a and the opening 77a.

The water tank 73 includes a rectangular bottom plate portion 79, a left side plate portion 80 standing from the left end of the bottom plate portion 79, and a right side plate portion standing from the right end of the bottom plate portion 79. 81, a rear side plate portion 82 erected from the rear end of the bottom plate portion 79, and a top plate portion 83 facing the bottom plate portion 79. On the front side, the bottom plate portion 79 and the rear side plate portion are provided. 82, an inflow space B (see FIG. 19) is formed, which is surrounded by the left side plate portion 80, the right side plate portion 81 and the top plate portion 83, and in which the air or water that has flowed in from the underfloor ventilation hole 11a flows into the water tank 73. It is In front of the water tank 73, the inflow space B is surrounded, and the base ends thereof are the front ends of the bottom plate portion 79, the left side plate portion 80, the right side plate portion 81, and the top plate portion 83. A front flange portion 73a is formed, and an insertion hole 73b through which the shaft portion of the bolt 85 is inserted is formed in the front flange portion 73a.

Further, the bottom plate portion 79 of the water tank 73 is formed with a lower flange portion 73d extending laterally or rearward from the left end, the right end and the rear end of the bottom plate portion 79, respectively. 73d is formed with an insertion hole 73e through which a shaft portion of a bolt 78 for fixing them to the support plate portion 75 constituting the water tank support member 72 is inserted. Further, the top plate portion 83 is formed with an opening C for opening and closing, which constitutes the present invention. Further, the floating valve 74 is a rectangular plate made of a material having a specific gravity of 1 or less, such as foamed styrene, and has an area larger than that of the opening C for opening and closing. be. The length of the floating valve 74 is longer than the length of the opening 77a formed in the rubber plate 77 for stopping water. Therefore, when the water level, which will be described later, drops, the floating valve 74 will flow into the water and will not be discharged to the outside.

Therefore, even in the case of the underfloor ventilation system 71 according to the second embodiment described above, in the same way as the underfloor ventilation system 1 according to the first embodiment, the underfloor ventilation hole 11a is connected to the water tank 73. The floating valve 74 floats as the water level rises and closes the open/close opening C from below, thereby preventing water from entering the underfloor space (underfloor flooding). be able to. In particular, the above-described underfloor ventilation system 71 can be fixed to the foundation 11 formed in the existing house.

Furthermore, the underfloor ventilation system according to the present invention differs from the underfloor ventilation system 1, 71 according to the first or second embodiment, from the configuration (third embodiment) shown in FIG. 20 or FIG. It can be anything. An underfloor ventilation device 91 according to the third embodiment includes a water tank support member 92 fixed to an existing base portion 11 in which an underfloor ventilation hole 11a is formed, and supported and fixed to the water tank support member 92. It is composed of a water tank 93 and a floating valve 94 housed in this water tank 93 . The water tank support member 92 includes a flat plate portion 95 fixed to the inner surface of the base portion 11 via a caulking material or a water stop plate (not shown), and an opening formed in the center of the flat plate portion 95 ( ), a front tubular portion 96 formed on the front surface of the flat plate portion 95 , and a rear tubular portion 97 formed on the rear surface of the flat plate portion 95 . The front pipe portion 96 and the rear pipe portion 97 communicate with each other, and the outer shape of the front pipe portion 96 is formed to have substantially the same shape as the underfloor ventilation hole 11a. , which is inserted from the inside of the base portion 11 into the underfloor ventilation hole 11a. In other words, each outer side surface of the front pipe portion 96 constituting the water tank support member 92 is a surface facing the four hole forming surfaces forming the underfloor ventilation holes 11a of the base portion 11 . A caulking material (not shown) is placed between the opposing surface of the front pipe portion 96 and the four hole forming surfaces forming the underfloor ventilation hole 11a when the underfloor ventilation hole 11a is inserted. This is the part to be filled. The rear pipe portion 97 is a portion that is inserted into an inflow space B formed on the front side of the water tank 93 to be described later and supports the water tank 93 . The flat plate portion 95 has a plurality of bolt insertion holes 95a through which bolts 99 for fixing the water tank support member 92 to the inner surface of the base portion 11 are inserted. are formed on both the upper and lower sides and the left and right sides of the . These bolts 99 are screwed into anchor nuts 100 driven into the inner surface of the base portion 11 at positions corresponding to the positions where the bolt insertion holes 95a are formed. That is, the entire water tank support member 92 is fixed to the base portion 11 by the bolt 99 screwed onto the anchor nut 100 .

The water tank 93 includes a rectangular bottom plate portion 101, a rear side plate portion 102 standing from the rear end of the bottom plate portion 101, and a left side plate standing from the left end of the bottom plate portion 101. 103, a right side plate portion 104 erected from the right end of the bottom plate portion 101, and a top plate portion 105 facing the bottom plate portion 101. On the front side, the bottom plate portion 101 and the rear side plate portion 102 , a left plate portion 103 , a right plate portion 104 and a top plate portion 105 form an inflow space B through which the air or water flowing from the underfloor ventilation hole 11 a flows into the water tank 93 . The inflow space B is a space into which the rear pipe portion 97 is fitted. Further, in the water tank 93, a flange portion 93a is formed on the front surface of the water tank 93 so as to surround the entrance of the inflow space B from the periphery. The flange portion 93a is a portion where the entire front surface abuts against the rear surface of the flat plate portion 95, and an insertion hole 93b through which the bolt 99 is inserted is formed in the flange portion 93a. Further, the top plate portion 105 is formed with an opening C for opening and closing, which constitutes the present invention. Further, the floating valve 94 is a rectangular plate made of a material having a specific gravity of 1 or less, such as foamed styrene, and has a larger area than the open/close opening C. As shown in FIG.

And even in the case of using the underfloor ventilation device 91 according to the third embodiment, the same as the underfloor ventilation device 1 according to the first embodiment and the underfloor ventilation device 81 according to the second embodiment When water flows into the water storage tank 93 from the underfloor ventilation hole 11a which is the circulation space A and from the inflow space B, the floating valve 94 floated due to the rise in the water level causes the opening C to open. It is blocked from below, and as a result, it is possible to prevent water from entering the underfloor space (underfloor flooding).

According to the houses provided with the underfloor ventilation devices 1, 71, 91 according to the above-described first to third embodiments, flooding occurs due to a typhoon, torrential rain, etc., and the outside of the foundation part 11 (external Even if the water level in the space) rises and water flows in from the underfloor ventilation hole 11a formed in the base portion 11 or from the inside thereof, the water flows through the floating valves 4, 74, and 94 for opening and closing. The opening C is closed from the lower side to prevent entry into the underfloor space of the house, effectively preventing underfloor flooding. In addition, in normal times when such floods do not occur, the air flows through the underfloor space and the outside space via the circulation space A, the inflow space B, and the opening C, respectively. The ventilation function and dehumidification function of the ventilation holes 11a can be effectively exhibited without being diminished. In particular, since the water tanks 3, 83, and 93 provided with the opening C for opening/closing are all positioned at a portion (under the floor of the house) slightly separated from the inner surface of the base portion 11, How to design the area of the opening C can be freely designed without being affected by the shape and size of the underfloor ventilation hole 11a, and the ventilation function and dehumidification by the underfloor ventilation hole 11a can be further improved. No loss of functionality.

1 Underfloor ventilation device 2 Water tank support member 3 Water tank 4 Floating valve 8 Water stop material filling part 10 Rotation guide part 11 Base part 11a Underfloor ventilation holes 11b, 11c, 11d, 11e Hole forming surface 21 Top plate part 21a First Upper rib 22 Left plate portion 23 Right plate portion 24 Bottom plate portion 24a First lower rib 24g Fixed shaft 34 Bottom plate portion 35 Rear side plate portion 36 Left plate portion 37 Right plate portions 41, 42 Left and right guide plate portions 71 Underfloor ventilation Device 72 Water tank support member 73 Water tank 74 Floating valve 75 Support plate part 76 Fixed plate part 79 Bottom plate part 80 Left side plate part 81 Right side plate part 82 Rear side plate part 83 Top plate part 91 Underfloor ventilation device 92 Water tank support member 93 Water storage Tank 94 Floating valve 101 Bottom plate portion 102 Rear side plate portion 103 Left side plate portion 104 Right side plate portion 105 Top plate portion A Distribution space B Inflow space C Open/close opening

Claims (8)

a water tank support member attached to the foundation of a house having an underfloor ventilation hole;
a water tank having at least a bottom plate portion and three side plate portions supported by the water tank support member, and an inflow space into which the air or water flowing through the underfloor ventilation holes flows; ,
an opening for opening and closing formed above the bottom plate portion constituting the water tank;
a floating valve that is housed in the water tank and closes the open/close opening from below when water flowing into the water tank reaches a predetermined height;
An underfloor ventilation system comprising: The underfloor ventilation holes are formed by four hole forming surfaces,
The water tank support member is a frame body formed on the outside with facing surfaces facing the four hole-forming surfaces, and on the inside with a flow space through which air or water flows,
2. The underfloor ventilation system according to claim 1, wherein the circulation space and the inflow space formed in the water tank communicate with each other. The water tank support member is a frame having a top plate portion, a bottom plate portion, a left side plate portion and a right side plate portion,
This frame is fixed at a predetermined position in a stage prior to forming the foundation with concrete,
A plurality of ribs extending in the longitudinal direction of the underfloor ventilation hole and facing each other are formed on the outer surfaces of the top plate portion and the bottom plate portion,
3. The underfloor ventilation system according to claim 2 , wherein the underfloor ventilation hole of the house is the circulation space formed inside the frame. The bottom plate portion constituting the water tank support member is formed in a rectangular shape, and the side plate portions constituting the water tank support member stand upright from the ends of the bottom plate portion. 4. The underfloor ventilation system according to claim 3 , wherein the space is provided with one or more guide members for guiding the floating valve that moves upward or downward in accordance with changes in the water level in the water tank. The floating valve is a square-shaped plate, and a plurality of supporting projections are formed on the upper surface of the bottom plate portion constituting the water tank to support the floating valve at the upper end. 5. An underfloor ventilation system according to claim 1, 2, 3 or 4. Both or one of the frame as the water tank supporting member and the water tank has fixing means for fixing the frame and the water tank,
Either the back surface of the frame or the front surface of the water tank is press-contacted with an endless groove filled with an elastic water-stopping material and the water-stopping material filled in the groove. and the pressure contact plate portion to be formed relatively,
6. The water stop material according to any one of claims 2, 3, 4 and 5, wherein the water stop material is pressed by the pressing plate portion by fixing the frame and the water tank by the fixing means. Underfloor ventilation system. An arc-shaped rotation guide portion is provided at either the lower end side of the back surface of the frame serving as the water tank support member or the lower end side of the front surface of the water tank, and the arc-shaped rotation guide portion is supported. Either the fixed shaft portion or the fixed shaft portion on which the arc-shaped rotation guide portion is supported is relatively formed,
While the fixed shaft portion is supported by the rotation guide portion, or while the fixed shaft portion is supported by the rotation guide portion, the entire water tank is rotated with respect to the water tank support member. 7. The underfloor ventilation system according to claim 2, wherein the ventilation system is fixed by fixing means. A house comprising the underfloor ventilation system according to any one of claims 1 to 7.

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