JP2014105503A - Underfloor flooding prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent flooding from a vent hole by blocking the vent hole and to secure a ventilation path for ventilation for an underfloor flooding prevention device which can be installed at a foundation part of a building.SOLUTION: An underfloor flooding prevention device comprises: a box body 7, 8 having a flooding port 19 opening on a primary side of a flooding route; a vent hole 14 opening on a secondary side of the flooding route; and a partition wall 10 having a communication hole 12 partitioning the inside into a primary side space and a secondary side space and communicating them; and a float plug body 9 floating on the water, and is constituted so as to prevent water leakage to the secondary side space by blocking the communication hole 12 by the float plug body 9 when the water W infiltrates from the flooding port 19 to the primary side space.

Description

  The present invention relates to an underfloor flood prevention device for preventing underfloor flooding in a building.

Underfloor inundation of buildings due to heavy rain, river flooding, etc. not only erodes the building itself, but also causes sanitation problems such as mold generation after the water is drawn.
Therefore, even if the site of the building is flooded, it is necessary to prevent flooding under the floor of the building. The main entrance of water under the floor is an underfloor ventilation opening of the building. For example, the following method has been proposed as a method for preventing water from entering under the floor. First of all, it is equipped with a vent and a plate-like door, and when this is installed under the floor and connected to the under-floor vent of the building, the vent hole is blocked by the plate-like door when water enters under the floor, This is a method in which further water immersion can be suppressed (for example, Patent Document 1). In addition, a method has been proposed in which a sphere floating in water is provided in the box instead of a plate-like door, and the sphere floating in water closes the vent hole when immersed (for example, Patent Document 2).

JP-A-9-13522 Japanese Patent No. 4727756

However, in the method in which the vent hole is blocked by the plate-shaped door, when water is drastically generated, the door is opened by the pressure when water flows in, and the vent hole may not be blocked.
Further, in the method of closing the vent hole by the sphere floating in the water provided in the box, if a gap is formed between the sphere and the vent hole, water may leak from the gap and the under floor may be submerged.

  In recent years, ventilators are sometimes installed under the floors of buildings, and these are connected to the underfloor vents by ducts and connected to the outside of the building. In such a case, in order to prevent water infiltrated from the underfloor vent from entering the ventilator through the duct, install an underfloor intrusion prevention device in the water intrusion path under the floor such as a duct or underfloor vent. There is a need. Since such a water ingress route is a ventilation path during normal times, it is necessary to ensure a sufficient ventilation path so that ventilation is possible during normal times even when the underfloor infiltration prevention device is attached. However, any of the above methods has a problem that it is difficult to secure an air passage because of the height restriction from the height under the floor.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide an underfloor infiltration prevention device that can reliably prevent underfloor inundation and can secure a ventilation path for ventilation within a height restriction that comes from the underfloor height.

In order to achieve the above object, the present invention is configured as follows.
That is, the present invention relates to an underfloor inundation prevention device for preventing inundation from the outside to the underfloor through the underfloor vent of the building, the inflow opening that opens to the primary side of the inundation path, the vent opening that opens to the secondary side, and the interior. By separating the primary side space and the secondary side space and having a partition wall having a communication hole for communicating them, and when water enters the primary side space from the water inlet, it floats on the water and closes the communication hole. Provided is an underfloor infiltration prevention device including a float plug that prevents water leakage to a secondary space.

  The present invention includes a submerged opening that opens to a primary side of a submerged passage, a vent opening that opens to a secondary side, and a partition that has a communication hole that divides the interior into a primary side space and a secondary side space and communicates them. It is assumed to have a box body having Since the inside of the box is divided into a primary side space and a secondary side space, even if water leaks outside the primary side space, it can be stored in the secondary side space, ensuring that the indoor side is flooded. Can be prevented. That is, unlike the case where only one “space” is provided, the water flowing out from the primary side space is directly connected to the secondary side of the underfloor infiltration prevention device, or the underfloor connected to the other end of the duct. There is no inconvenience that the indoor side is inundated by flowing into the ventilation device. In addition, the present invention adopts such a structure to achieve both a secure ventilation path and prevention of flooding during normal times, and can be downsized in accordance with the installation environment. Therefore, it can be installed in an environment with a height restriction under the floor.

  Moreover, this invention is provided with the float stopper which floats on water by buoyancy in primary side space. When water enters the primary side space and the water volume increases, the float plug rises by buoyancy and contacts the edge of the communication hole. As a result, the communication hole can be closed to prevent water from leaking into the secondary side space and water from the vent to the bottom of the floor.

  The vent hole may be provided at a position higher than the bottom wall of the box. When the primary space is submerged, even if water leaks to the indoor side of the primary space before the communication hole is completely blocked by the float plug, the vent is positioned higher than the bottom wall of the box. Is provided. For this reason, water can be stored using the part from the bottom wall of the box to the height of the vent as a water storage section. Therefore, even if water leaks from the primary side space, water can be stored in the water storage part of the secondary side space to prevent inundation into the ventilator or the duct.

  An airflow guide portion that narrows the flow of air from the ventilation port in the reverse direction of the water immersion path to the communication hole can be provided inside the box. Since the airflow guide part that narrows the flow of air from the vent in the reverse direction of the flooding path to the communication hole is provided inside the box, the air flowing into the box from the vent is retained in the secondary space. In addition, the flow of air from the communication hole to the primary side space can be made smooth. Thereby, the pressure loss of the underfloor infiltration prevention device can be reduced.

  An airflow guide portion can be formed on the side wall forming the secondary space of the box body so as to narrow the flow of air from the vent hole in the reverse direction of the submerged path to the communication hole. By forming the airflow guide portion on the side wall forming the secondary side space of the box body, it is possible to reduce the connection portion and the gap between the members as compared to the case where the side wall and the airflow guide portion are provided separately. It is possible to form a floor underfloor prevention device having a simpler structure. Thereby, the turbulence of air can be reduced and the pressure loss of the underfloor infiltration prevention device can be reduced. In addition, the number of parts and the amount of material used can be reduced, and a lower underfloor inundation prevention device can be obtained at a lower cost.

  The float plug body may be a float sphere, and may include a collision prevention unit for preventing the float sphere from colliding with the side wall of the box in the primary space of the box. Thereby, it is possible to prevent the float sphere moved by the airflow flowing in the underfloor infiltration prevention device from colliding with the side wall of the box forming the primary space and generating noise.

The float sphere may be an eccentric sphere. By making the float sphere an eccentric gravity center sphere whose center of gravity is decentered from the center of the sphere, the float can be lifted so that the heavy portion is at the bottom when floating on the water.
Although there are cases where fine irregularities are generated on the surface of the float sphere, when the float floats on the water in this state, the irregularities are in contact with the edge of the communication hole and a gap is formed between the float sphere. Therefore, in order to prevent this, the float sphere has a gradient in mass, and when floating in water, the heavy part is lifted so that the heavy part is below. It can be adjusted to touch. Also, when it is difficult to form the spherical shape of the float sphere as a smooth surface without irregularities, for example, when manufacturing the float sphere as a product formed by joining a plurality of divided spheres (two hemispheres as an example) There is a possibility that burrs may be generated at the joining portion or the joining positions of the hemispheres may be shifted. However, if a specific part can be intentionally brought into contact with the hole edge of the communication hole as the eccentric sphere, it is possible to prevent the joint part from coming into contact with the hole edge. For this reason, it is possible to avoid the inconvenience that the sealing is not sufficiently performed due to a step due to a burr or a shift in the joining position.

  The float sphere may consist of polyvinyl chloride. If the float sphere is formed of polyvinyl chloride, it can withstand a large water pressure, and is suitable as a member of an underfloor infiltration prevention device that is resistant to deterioration over time and has a long service life. A sphere having a gap inside can be easily formed, and an eccentric gravity center sphere having a decentered center of gravity can be easily formed by decentering the gap. Furthermore, since there is no bubble and water and air do not easily pass through, the communication hole can be closed more firmly than in the case of using a foam or the like.

  A packing made of an elastic member that stops water from the primary side space to the secondary side space by elastic contact with the float plug at the hole edge of the communication hole can be provided. Thereby, when the communication hole is closed, a tight gap can be formed between the packing and the float plug without generating a gap. Thereby, it is possible to reliably prevent water leakage from the communication hole.

  And this packing can be formed so that the front and back both surfaces of the hole edge of a communicating hole may be covered. By making it the shape which covers the front and back both surfaces of the hole edge of a communicating hole, it can be made hard to remove | deviate from the hole edge of a communicating hole.

  Further, the packing can have an inclined portion. When the float plug body is a float sphere, by providing the packing with an inclined portion so as to follow the surface shape of the float sphere, the inclined portion comes into surface contact with the float sphere, and water tightness can be further improved. Thereby, the inflow to the secondary side space of water can be suppressed.

  The packing can be foamed rubber. By using foamed rubber as the packing, a fine sponge-like packing can flexibly follow and deform to the surface shape of the float plug, thereby exhibiting a high water-stopping property. In terms of manufacturing, it is possible to obtain an easy and inexpensive packing by molding by punching.

A vent opening that opens in the secondary side space of the box body may be connected to the under floor ventilation opening of the building from the outdoor side.
Thereby, the underfloor infiltration prevention device of the present invention can be installed outdoors. Therefore, it can be retrofitted to the completed building.

  According to the underfloor inundation prevention device of the present invention, since it is possible to prevent inundation from the underfloor ventilation opening of the building to the underfloor, it is possible to solve the sanitary problem due to the erosion of the building or the occurrence of mold due to the inundation. . Moreover, the ventilation path for ventilation by a ventilator can be ensured, preventing the malfunction by the infiltration of a ventilator.

It is explanatory drawing which shows the installation place of the underfloor infiltration prevention apparatus of 1st Embodiment. It is a perspective view which shows the underfloor infiltration prevention apparatus of 1st Embodiment. It is the SA-SA sectional view taken on the line of FIG. It is the SB-SB sectional view taken on the line of FIG. It is the SC-SC sectional view taken on the line of FIG. Part (a) is a partially enlarged sectional view of the packing showing the region R in FIG. 3, and part (b) is an explanatory view showing a state in which a float sphere is pressed against the packing. It is explanatory drawing which shows the operation state of an underfloor infiltration prevention apparatus. It is a top view which shows the underfloor infiltration prevention apparatus of 2nd Embodiment. It is a side view which shows the underfloor infiltration prevention apparatus of 2nd Embodiment. It is a front view which shows the underfloor infiltration prevention apparatus of 2nd Embodiment. It is a rear view which shows the underfloor infiltration prevention apparatus of 2nd Embodiment. It is sectional drawing equivalent to FIG. 4 which shows the underfloor infiltration prevention apparatus of 2nd Embodiment. It is sectional drawing equivalent to FIG. 3 which shows the underfloor infiltration prevention apparatus of 3rd Embodiment. It is the SD-SD sectional view taken on the line of FIG. It is explanatory drawing which shows the installation place of the underfloor infiltration prevention apparatus of 4th Embodiment. It is sectional drawing equivalent to Fig.6 (a) which shows the underfloor infiltration prevention apparatus of 5th Embodiment. Partial drawings (a) to (e) are partially enlarged cross-sectional views showing modifications of the packing.

  Embodiments of the present invention will be described in more detail with reference to the drawings. Components common to the following embodiments are denoted by the same reference numerals, and redundant description is omitted.

First Embodiment [FIGS. 1 to 7]:
FIG. 1 is an explanatory view showing an installation location of the underfloor infiltration prevention device 1 of the first embodiment, and FIG. 2 is a perspective view of the underfloor infiltration prevention device 1. 3 to 5 are main cross-sectional views of the underfloor infiltration prevention device 1 cut along various cross sections, FIG. 6A is a partial enlarged cross-sectional view of the packing 24a, and FIG. 6B is a float sphere on the packing 24a. FIG. 7 is an explanatory view showing a state where 9 is pressed, and FIG. 7 is an explanatory view showing an operating state of the underfloor infiltration prevention device 1.

  As shown in FIG. 1, the underfloor inundation prevention device 1 can be installed on the foundation 2 of the building, and is installed between the ventilator 3 and the underfloor vent 4. The ventilation device 3 and the underfloor infiltration prevention device 1 are connected via a duct 5, and the underfloor infiltration prevention device 1 and the underfloor ventilation port 4 are connected directly or indirectly via a duct 5 or the like. Moreover, the installation position can be adjusted according to the height of the underfloor ventilation port 4 by providing the support base 6 under the underfloor inundation prevention device 1.

The underfloor infiltration prevention device 1 prevents inundation from the outside to the underfloor through the underfloor vent 4 of the building. The concrete structure is based on the structure provided with the outer case 7, the inner case 8, and the float sphere 9 as shown in FIGS.
Among these, the outer box 7 and the inner box 8 constitute the “box” of the present invention. The inside of the “box” (boundary between the outer box 7 and the inner box 8) is formed by two walls as a “partition wall” of the present invention, that is, a ceiling wall 10 and a back wall 11a of the inner box 8 described later. It is partitioned into a primary side space (inner box 8) and a secondary side space (outer box 7). An inner box back side hole 12 as a “communication hole” of the present invention is opened in the ceiling wall 10 of the inner box 8. The float sphere 9 is provided in the inner box 8 as a primary space.
In this specification, the terms “front side” and “back side” are used when the underfloor infiltration prevention device is installed at a predetermined location and the underfloor infiltration prevention device is viewed from the outdoor side of the building toward the indoor side. The outdoor side is the “front side” and the indoor side is the “back side”.
The float sphere 9 is made of a material that floats on water, such as a foam or hollow polyvinyl chloride. The outer box 7 and the inner box 8 are made of a metal material that is resistant to corrosion by water, such as a galvanized steel plate or stainless steel.

(Outer box and inner box)
The outer box 7 has a substantially rectangular parallelepiped shape formed by the back wall 13a, the front wall 13b, the left side wall 13c, the right side wall 13d, the ceiling wall 22, and the bottom wall 18. Further, the back wall 13a has an outer case back side hole 14 as a “vent hole” of the present invention, and the front wall 13b has an outer case front side hole 15 as a “submersion port” of the present invention. Ventilation cylinders 16a and 16b are respectively provided in the outer box inner side hole 14 and the outer box front side hole 15, and these are fixed by riveting, caulking, adhesive, waterstop caulking or the like. A duct 5 connected to the ventilation device 3 can be connected to the ventilation cylinder 16a. The ventilation tube 16b can be directly connected to the underfloor ventilation port 4, but can also be connected via the duct 5 depending on the installation location.

  The inner box 8 is provided inside the outer box 7 to form a primary side space inside the outer box 7, and includes a back wall 11a, a front wall 11b, a left side wall 11c, a right side wall 11d, a ceiling wall 10, and a bottom. It has a substantially rectangular parallelepiped shape formed by the wall 17. The inner box 8 is provided by attaching two wall plates of a back wall 11a and a ceiling wall 10 inside the outer box 7, and the front wall 11b, the left side wall 11c, the right side wall 11d and the bottom wall 17 of the inner box 8 are provided. Are formed as a common wall integral with the front wall 13b, the left side wall 13c, the right side wall 13d and the bottom wall 18 of the outer box 7, respectively. The front wall 11b of the inner box 8 is provided with an inner box front side hole 19 as a “flood opening” of the present invention, and the ceiling wall 10 is provided with an inner box back side hole 12 as a “communication hole” of the present invention. . The inner box front side hole 19 and the outer box front side hole 15 communicate with each other and are formed as an integral common wall. By providing the common part of the inner box 8 and the outer box 7, the number of parts and the amount of material used can be reduced, and the manufacturing cost can be kept low. Moreover, it can be set as the more compact underfloor infiltration prevention apparatus 1. FIG.

  Further, the outer box inner side hole 14 of the outer box 7 is provided at a position higher than the bottom wall 18. Even if the water W that has entered the inner box 8 from the inner box front side hole 19 of the inner box 8 leaks into the outer box 7, the portion from the bottom wall 18 of the outer box 7 to the height of the vent 14 is stored in the water storage section. And can store water there. Thereby, it is possible to prevent the water W from leaking from the outer box back side hole 14 to the duct 5.

  The inner box 8 and the outer box 7 are formed in a substantially rectangular parallelepiped shape by fixing metal plates such as galvanized steel plates with rivets, caulking, adhesive, or water-stop caulking. As a result, the manufacturing operation becomes easier as compared with the case of welding, and the same shape can be mass-produced without causing inconvenience such as deformation of the metal plate due to heat during the operation.

(Airflow guide)
On the upper surface of the ceiling wall 10 of the inner box 8, two airflow guide portions 20 a and 20 a having a plate shape are installed with the inner box inner side hole 12 interposed therebetween. The two airflow guide portions 20a and 20a are provided in a square shape opened from the outdoor side toward the indoor side. The air discharged from the duct 5 and flowing into the outer box 7 from the outer box inner hole 14 is guided to the inner box inner hole 12 of the inner box 8 without staying in the outer box 7. On the other hand, air that has flowed from the inner box 8 into the outer box 7 through the inner box inner hole 12 is smoothly guided toward the outer box inner hole 14 in the outer box 7. Thereby, the pressure loss of the underfloor infiltration prevention device 1 can be reduced. A flange 21 is provided on either the upper end or the lower end of the airflow guide portions 20a, 20a in a state of being installed on the ceiling wall 10 of the inner box 8 (FIG. 4 shows the flange 21 provided on the lower end). . The flange 21 provided at the upper end is in contact with the ceiling wall 22 of the outer box 7, and the flange 21 provided at the lower end is in contact with the ceiling wall 10 of the inner box 8, and they are fixed at the contact portion.

(Float sphere)
A float sphere 9 is accommodated in the inner box 8. The float sphere 9 has a larger diameter than the inner box back side hole 12. Thereby, it is possible to prevent the float sphere 9 from coming out of the inner box back side hole 12.

  The float sphere 9 is made of a foam or hollow polyvinyl chloride or the like that floats in the water W, and has a buoyancy that allows the upper hemisphere of the float sphere 9 to be completely above the water surface when it floats in the water W. preferable. Accordingly, the inner box back side hole 12 can be blocked by the float sphere 9 by making the diameter of the inner box back side hole 12 slightly smaller than the diameter of the float sphere 9, thereby preventing water leakage. The pressure loss of the flood preventing device 1 can be kept low.

  Since the foam is solid but fine bubbles are formed, when the float sphere 9 receives buoyancy during water immersion and is strongly pressed against a packing 24a described later provided at the hole edge 23 of the inner box inner side hole 12. There is a disadvantage that the water W oozes out through the bubbles. Therefore, in order to suppress the seepage, a film for preventing water leakage by coating or the like is formed on the surface of the float sphere 9. On the other hand, as a merit of the foam, the float sphere 9 made of the foam is light in weight and easily floats on the water W, so that it does not need to be formed as a hollow structure that increases buoyancy. Therefore, there is also an advantage in terms of manufacturing that it can be formed as a solid structure that can be easily molded.

  On the other hand, the float sphere 9 made of polyvinyl chloride needs to have a hollow structure in order to obtain buoyancy, but has no bubbles like a foam. Therefore, even if it receives buoyancy and is strongly pressed against the packing 24a, the water W does not ooze out unlike the foam, which is advantageous in that it is not necessary to provide a coating for preventing water leakage on the surface.

  Further, when the float sphere 9 made of polyvinyl chloride is used, processing is easy and the thickness can be set freely. Therefore, for example, the float sphere 9 can be decentered by making it partially thick and heavy, and the float sphere 9 can be configured such that the specific portion is upward when it floats on the water W. That is, even if the float sphere 9 is manufactured by combining two hemispheres, the bonded portion can be prevented from coming into contact with the packing 24a, so that the sealing effect can be enhanced.

(Packing)
As shown in FIG. 6A, the hole edge 23 of the inner box inner side hole 12 is formed of an elastic member that prevents water from entering the inner box 8 from the inner box 8 by elastic contact with the float sphere 9. The packing 24a is fixed. The material of the packing 24a is preferably a flexible material made of foamed rubber or silicone rubber. As a result, as shown in FIG. 6B, the float sphere 9 is pressed and the packing 24 a is deformed, so that the float sphere 9 can be brought into close contact with and close the gap.

  The packing 24 a is installed at the hole edge 23 by being sandwiched between the ring-shaped plate 10 a having a ring shape along the hole edge 23 and the ceiling wall 10 of the inner box 8 by screws 10 b. The screw 10b is fixed from the lower side of the ceiling wall 10 with the screw tip facing upward. Further, by providing an O-ring 10 c between the head of the screw 10 b and the ceiling wall 10, when the inner box 8 is submerged, the gap from the screw hole opened in the ceiling wall 10 to the secondary side space is routed. Intrusion of water W can be prevented.

(Collision prevention unit)
The inner box 8 is provided with two thin plate-like collision preventing portions 25, 25 vertically from the periphery of the inner box inner side hole 12 to the bottom wall 17 directly below. Since the float sphere 9 is restricted in movement in the front-rear and left-right directions (excluding top and bottom) by the two collision prevention portions 25 and 25 and the inner wall 8a of the inner box 8, the float sphere 9 is blown into the inner box 8 by blowing air. Generation of noise due to movement and collision with the side walls 11c, 11d and the front wall 11b and breakage / damage of the float sphere 9 can be suppressed. Further, by restricting the movement of the float sphere 9, the float sphere 9 can be prevented from slipping out of the underfloor infiltration prevention device 1 through the inner box front side hole 19. Furthermore, the collision prevention parts 25 and 25 may cover the surface in contact with the float sphere 9 with a cushioning material made of foam or rubber-like elastic body. Thereby, breakage / damage of the float sphere 9 can be suppressed more reliably.

(Description of operating state)
When the water W reaches the underfloor ventilation port 4 during the flooding, the water W enters the inner box 8 from the underfloor ventilation port 4 through the outer box front side hole 15 and the inner box front side hole 19. As the water content in the inner box 8 increases, the float sphere 9 rises by buoyancy and eventually reaches the inner box inner side hole 12. As described above, the float sphere 9 has a diameter larger than that of the inner box back side hole 12, so that it cannot pass through the inner box back side hole 12 and is pressed against the hole edge 23. Since the packing 24a is provided on the hole edge 23 as described above, the float sphere 9 and the packing 24a are in close contact with each other without a gap. Thereby, the closed state of the inner box back side hole 12 is completed. At this time, even if some water flows out to the outer box 7 before the inner box inner hole 12 is completely closed by the float sphere 9, the height of the vent 14 is increased from the bottom wall 18 of the outer box 7. The portion up to this point is used as a water storage section, and water W can be stored there. Thereby, it is possible to prevent the water W from entering the duct 5.

Modification of the first embodiment:
In the underfloor inundation preventing apparatus 1 of the first embodiment, the inner box 8 is provided by attaching two wall plates of the back wall 11 a and the ceiling wall 10 inside the outer box 7. However, the inner box 8 can also be provided by installing a hexahedral box inside the outer box 7.

Second Embodiment [FIGS. 8 to 12]:
The underfloor infiltration prevention device 1 of the first embodiment is provided so that the airflow guide portions 20 a and 20 a are formed separately from the outer box 7 and are housed in the outer box 7. On the other hand, the underfloor infiltration prevention device 26 in the second embodiment is formed as a common wall in which the airflow guide portions 20b and 20b are integrated with the left side wall 13c and the right side wall 13d of the outer box 7 as shown in FIGS. The left side wall (outer box) 13c and the left side wall (inner box) 11c, the right side wall (outer box) 13d and the right side wall (inner box) 11d, the ceiling wall (outer box) 22 and the ceiling wall (inner box) 10 are called. Of the two wall surfaces parallel to each other, the overlapping wall surfaces were deleted as much as possible to obtain one wall surface. Thereby, compared with 1st Embodiment which provided airflow guide part 20a, 20a separately from the outer case 7, since the usage-amount of the metal material to be used can be reduced, manufacturing cost can be lowered | hung.

Third Embodiment [FIGS. 13 and 14]:
The underfloor infiltration prevention devices 1 and 26 of each of the above embodiments have a left side wall (outer box) 13c and a left side wall (inner box) 11c, a right side wall (outer box) 13d, and a right side wall (inner box) 11d partially. It is formed as a common common wall. On the other hand, in the underfloor inundation preventing device 27 in the third embodiment, as shown in FIGS. 13 and 14, each is separated and formed as a completely separate body.

  Accordingly, spaces are provided between the left side wall (outer box) 13c and the left side wall (inner box) 11c, and between the right side wall (outer box) 13d and the right side wall (inner box) 11d. In addition, a new air flow path is generated. The air that has entered the outer box 7 from the outer box back side hole 14 enters the inner box back side hole 12 from these flow paths. Conversely, the air that has entered the inner box 8 from the inner box front side hole 19 diffuses in each direction including the new space through the inner box rear side hole 12 and is submerged under the floor through the outer box rear side hole 14. It is discharged out of the prevention device 27. Thereby, in the underfloor infiltration prevention device 27, pressure loss can be suppressed low without providing the airflow guide portion 20a.

  Water W can be stored using a portion from the bottom wall 18 of the outer box 7 to the height of the vent 14 as a water storage portion. In particular, in this embodiment, the space between the left side wall (outer box) 13c and the left side wall (inner box) 11c and the space between the right side wall (outer box) 13d and the right side wall (inner box) 11d Water W leaked from the hole 12 can be stored. Thereby, it is possible to more reliably prevent water from entering the duct 5 from the outer box back side hole 14.

Fourth Embodiment [FIG. 15]:
The underfloor infiltration prevention devices 1, 26 and 27 of each of the embodiments are installed between the underfloor vent 4 of the building and the ventilator 3 under the building floor.
On the other hand, the underfloor infiltration prevention device 28 in the fourth embodiment is installed outdoors by connecting the outer case back side hole 14 to the underfloor ventilation port 4 communicating with the ventilation device 3. At this time, if necessary, the support base 6 is provided outdoors, and the underfloor infiltration prevention device 28 is installed thereon. For example, when there is no space near the underfloor ventilation port 4 and it is difficult to install, the underfloor inundation prevention device 28 is installed at a location away from the underfloor ventilation port 4, and the underfloor ventilation port 4 and the ventilation cylinder 16 a Are connected via a duct 5. As a result, the underfloor infiltration prevention device 28, the underfloor ventilation port 4 and the ventilating device 3 communicate with each other to allow ventilation.

  Moreover, since the underfloor infiltration prevention device 28 can be installed outdoors, it can be installed without being restricted in height as in the case of being installed in a narrow underfloor space. Therefore, the size can be changed according to the installation location and the type of the ventilation device 3. Therefore, for example, it is possible to increase the size in order to cope with the large ventilation device 3. In addition, the height and size of the inner box front side hole 19 and the outer box back side hole 14, and the size of the inner box back side hole 12 and the float sphere 9 can be changed accordingly. The inundation prevention device 28 can be provided.

Fifth Embodiment [FIG. 16]:
As shown in FIG. 6, the packing 24 a of each of the above embodiments is installed by being sandwiched between the ring-shaped plate 10 a and the ceiling wall 10 of the inner box 8. On the other hand, the packing 24b of the underfloor infiltration prevention device 29 in the fifth embodiment is provided so as to cover both the front and back surfaces of the hole edge 23 of the inner box back side hole 12, as shown in FIG. Thereby, even if the float sphere 9 strikes the packing 24b vigorously, the packing 24b is difficult to come off from the hole edge 23 of the inner box back side hole 12.

Modified example of the fifth embodiment [FIG. 17]:
The underfloor infiltration prevention device 29 of the fifth embodiment has a packing 24b having a shape protruding toward the center direction of the inner box back side hole 12 at the hole edge 23 of the inner box back side hole 12 of the inner box 8, It is also possible to change the shape.

  As shown in FIG. 17A, the packing 24c projects in a tapered shape toward the hole edge 23 of the inner box back side hole 12 of the inner box 8 toward the center of the inner box back side hole 12, and the float sphere 9 It has the inclined surface 24c1 along the surface shape. As a result, the float sphere 9 pressed against the packing 24c by water pressure comes into contact with the inclined surface 24c1 with a curved surface, and therefore the float sphere 9 and the packing 24c are in close contact with each other when the underfloor infiltration prevention device 29 is operated. Leakage of W can be reliably suppressed.

  Or as shown in FIG.17 (b), it can also be set as the packing 24d with which the protrusion part protruded from the hole edge 23 of the inner case back side hole 12 to the center direction of the inner case back side hole 12 overlaps with an up-down direction. By overlapping a plurality, the float sphere 9 and the packing 24d can be brought into contact with each other at a plurality of contact points, and the water tightness can be improved. Here, an example in which a double layer is provided is shown, but a triple layer or more can also be provided.

  As shown in FIG. 17C, the packing 24e can be provided obliquely downward from the hole edge 23 toward the center. Since the packing 24e is in contact with the float sphere 9 at a lower position, the inner box back side hole 12 can be closed at an earlier stage during the flooding. Further, when the packing 24e heading obliquely downward is pressed by the float sphere 9, it deforms upward, so that the adhesion to the float sphere 9 can be enhanced by the elastic force to return downward.

  Furthermore, as shown in FIG. 17 (d), the vertically long packing 24f can be formed. Since it has a thickness below, a collapsed portion when pressed by the float sphere 9 can be provided large, and the adhesion to the float sphere 9 can be enhanced by the restoring force of the large collapsed portion.

  And as shown in FIG.17 (e), it can be set as the packing 24g which provided the inclined surface 24g1 which inclines toward the outer side of the inner case back side hole 12 from the hole edge 23 of the inner case back side hole 12. FIG. . Since the packing 24g has the inclined surface 24g1 from the bottom to the outside of the hole edge 23, the contact area with the float sphere 9 can be increased without narrowing the inner box back side hole 12. For this reason, it is possible to suppress a normal pressure loss in which the inner box back side hole 12 is not blocked.

Modification of each embodiment:
In each of the above embodiments, examples in which the metal plates are connected by riveting, caulking, adhesive, water-stop caulking, or the like are shown as means for connecting the metal plates, but they may be connected by welding. As a result, the metal plates can be firmly connected without any gap.
In each said embodiment, although the example which provides the two collision prevention parts 25 was shown, the number is not limited to this.

  Furthermore, in each said embodiment, the ventilation cylinders 16a and 16b, the outer case back | inner side hole 14, the outer case front side hole 15, and the inner case front side hole 19 showed the example circular. However, for example, when connecting to a square duct or a square shaped underfloor vent 4, the shape and shape can be modified to match these shapes. Thereby, since it can prevent that a clearance gap arises in a connection part, generation | occurrence | production of water leakage can be prevented more reliably.

  In each of the above-described embodiments, the example in which the float plug body is the float sphere 9 is shown. This float sphere 9 has no anisotropy and can close the circular inner box back side hole 12 on any surface, and the spherical surface enters the inner box back side hole 12 and protrudes to the upper surface side of the ceiling wall 10 so that packing is further performed. This is advantageous in that it can be in watertight contact with 24a. However, if these advantages are not taken into consideration, a three-dimensional shape such as a hemispherical shape or a planar shape such as a flat plate shape may be used.

DESCRIPTION OF SYMBOLS 1 Underfloor infiltration prevention device of 1st Embodiment 2 Base part 3 Ventilation device 4 Underfloor ventilation port 5 Duct 6 Support stand 7 Outer box 8 Inner box 9 Float ball 10 Ceiling wall (inner box)
10a Ring-shaped plate 10b Screw 10c O-ring 11a Back wall (inner box)
11b Front wall (inner box)
11c Left side wall (inner box)
11d Right side wall (inner box)
12 Inner box back side hole 13a Back wall (outer box)
13b Front wall (outer box)
13c Left side wall (outer box)
13d Right side wall (outer box)
14 Outer box inner hole 15 Outer box front hole 16a Ventilation cylinder 16b Ventilation cylinder 17 Bottom wall (inner box)
18 Bottom wall (outer box)
19 Inner box front side hole 20a Airflow guide part 20b Airflow guide part 21 Flange 22 Ceiling wall (outer box)
23 Hole edge 24a-24g Packing 24c1, 24g1 Inclined surface 25 Collision prevention part 26 Underfloor infiltration prevention device of 2nd Embodiment 27 Underfloor infiltration prevention device of 3rd Embodiment 28 Underfloor infiltration prevention device of 4th Embodiment 29 5th implementation Form underfloor inundation prevention device W Water

Claims (9)

In the underfloor inundation prevention device that prevents inundation from the outside to the underfloor through the underfloor vent of the building,
A box having a submerged opening that opens to a primary side of a submerged passage, a vent opening that opens to a secondary side, and a partition that has a communication hole that divides the interior into a primary side space and a secondary side space and communicates them. ,
An underfloor inundation prevention device comprising: a float plug that prevents water leakage to the secondary side space by floating into the water and closing the communication hole when water enters the primary side space from the water inlet.   The underfloor infiltration prevention device according to claim 1, wherein the vent is provided at a position higher than a bottom wall of the box.   The underfloor inundation preventing device according to claim 1 or 2, further comprising an airflow guide portion that narrows the flow of air from the ventilation port in the reverse direction of the inundation path to the communication hole inside the box.   The underfloor inundation prevention according to claim 1 or 2, wherein an airflow guide portion is formed on the side wall forming the secondary space of the box body so as to narrow the flow of air from the vent in the reverse direction of the inundation path to the communication hole. apparatus. The float plug is a float sphere,
The underfloor infiltration prevention device according to any one of claims 1 to 4, further comprising a collision prevention unit that prevents the float sphere from colliding with a side wall of the box in the primary space of the box.   6. The underfloor infiltration prevention device according to claim 5, wherein the float sphere is made of polyvinyl chloride.   The underfloor inundation according to any one of claims 1 to 6, further comprising a packing made of an elastic member that prevents inundation from the primary side space to the secondary side space by elastic contact with the float plug at the hole edge of the communication hole. Prevention device.   The underfloor infiltration prevention device according to claim 7, wherein the packing is foamed rubber.   The underfloor infiltration prevention device according to any one of claims 1 to 8, wherein a vent opening that opens in the secondary side space of the box body is connected to the underfloor vent of the building from the outdoor side.

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