Water shielding device for water drip foundation

Abstract

To provide a water shielding device capable of preventing the position of a water absorption expansion material from being deviated or being washed away even when a water flow surging to a building is violent and a large water flow splashes in the horizontal direction, and capable of reliably exhibiting water shielding performance.SOLUTION: A water shielding device for water drip foundation includes: a vent hole for communicating an underfloor space of a building and the outside air; and an outside air opening in communication with the vent hole via a ventilation space, for introducing the outside air outside the building. The water shielding device includes an opposing piece for partitioning the vent hole and the outside air opening in the ventilation space and having an opposing surface opposing to the vent hole. On the opposing surface, a water absorption expansion material is mounted which expands by absorbing water and closes the vent hole.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a waterproofing device for a foundation drain that prevents flood damage by blocking vents to the underfloor space installed between the foundation and base of a building in the event of flooding. [Background technology]

[0002] Because moisture accumulates in the space under the floor of a building, a common structure is to place a spacer between the building's base and the foundation on which it rests, and to provide a ventilation hole between them.

[0003] Meanwhile, recent climate change has led to frequent flooding in various regions. When a building is flooded due to torrential rain or river flooding, water can seep in through these vents and accumulate in the space under the floor, causing greater water damage.

[0004] To solve this problem, the following conventional technology exists as a waterproofing device that uses a material that absorbs water and expands in part to automatically close the air vent when the building is submerged in water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2017-008654

[0006] Patent Document 1 basically discloses an embodiment in which a blocking plate (72) or a blocking member (132) is moved by a water-absorbing volumetric expansion material (8) that absorbs water and expands, thereby closing the ventilation path (see Figures 1 and 5).

[0007] In addition, the second embodiment of Patent Document 1 discloses a foundation water-blocking device that uses a water-absorbing volumetric expansion material (8) to block the ventilation path (VR) connecting the outdoors (O) to the underfloor space (U).

[0008] In particular, in this second embodiment, a reservoir tank (11) for collecting water is formed in the middle of the ventilation path (VR), and a water-absorbing volumetric expansion material (8) is placed on the bottom (111) of the reservoir tank (11). When water enters and fills the reservoir tank (11), the water-absorbing volumetric expansion material (8) expands and comes into contact with the hanging portion (12), closing the ventilation path (VR) formed there, thereby preventing water from entering the underfloor space (U) (see FIG. 4). Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the above-mentioned conventional waterproofing device, the blocking plate (72) and the blocking member (132) are made of hard materials such as metal, and therefore have poor shape-following ability, and even when they come into contact with the protruding portion (92) and the hanging portion (12), high watertightness performance cannot be expected.

[0010] Furthermore, in the conventional technology of the second embodiment described above, in which the water-absorbing volumetric expansion material (8) directly blocks the ventilation path, the water-absorbing volumetric expansion material (8) arranged horizontally in the ventilation path has no means of preventing water pressure when it is applied horizontally because water flows in horizontally, and there is a possibility that the water-absorbing volumetric expansion material (8) may be washed away in whole or in part, preventing it from fully exhibiting its waterproofing function.

[0011] The present invention solves the problems with conventional foundation drains that have a water-blocking function, and aims to provide a water-blocking device for foundation drains that directly blocks the air vent with a water-absorbing expansion material facing the air vent, so that the water-absorbing expansion material will not be washed away even if a large water pressure is applied by the water flow from the outside of the building toward the air vent. [Means for solving the problem]

[0012] A typical configuration for solving the above problem is a water-tight device for a foundation drain that has an air vent that connects the underfloor space of a building with the outside air, and an outside air opening that connects to the air vent through an air vent space and introduces outside air from outside the building, wherein the water-tight device has an opposing piece that separates the air vent and the outside air opening within the air vent space and has an opposing surface facing the air vent, and is fitted with a water-absorbing expansion material that expands when it absorbs water and blocks the air vent. [Effects of the Invention]

[0013] In this invention, when the foundation flashing is submerged in water and the water reaches the vent, the water-absorbing expansive material attached to the opposing surface facing the vent absorbs water and increases in volume, directly blocking the vent and preventing water from entering the space under the floor of the building. In particular, when this expansion occurs, the opposing piece that forms the opposing surface supports the expansion pressure of the water-absorbing expansive material, so this expansion pressure can be directed toward the vent, ensuring that the vent is blocked.

[0014] Furthermore, even if the water current rushing toward the building is strong and a large horizontal current is applied, the opposing piece behind the water-absorbing expansion material prevents the water-absorbing expansion material from being directly subjected to horizontal water pressure, thereby preventing the water-absorbing expansion material from shifting position or being washed away, ensuring water-blocking performance. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side cross-sectional view of a foundation structure of a building to which a waterproof device according to a first embodiment of the present invention is attached. [Figure 2] FIG. 2 is a perspective view of the water-shielding device according to the embodiment. [Figure 3] 4 is an explanatory diagram illustrating the function and effect of the water-shielding device according to the embodiment. FIG. [Figure 4] 10 is an explanatory diagram illustrating a method for attaching and detaching the cover member of the water-shielding device according to the embodiment. FIG. [Figure 5] FIG. 10 is an exploded perspective view of a cover member of a water-blocking device according to a second embodiment of the present invention. [Figure 6]FIG. 10 is a cross-sectional side view of a foundation structure of a building to which a waterproof device according to a third embodiment of the present invention is attached. [Figure 7] FIG. 2 is a perspective view of the water-shielding device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] [First embodiment] A first embodiment of a waterproofing device for a foundation dripping according to the present invention will be specifically described with reference to Figs. 1 to 4 .

[0017] 1 and 2, the waterproofing device A for foundation drainage in the first embodiment is composed of a main body 11 that is attached so as to block the ventilation space 103a of a foundation packing (cat foundation) 103 formed between a foundation 101 and a foundation 102 of a building 100, and a cover member 12 that is detachably attached to the main body 11 so as to cover the outside air side of the main body 11. In each figure, both the main body 11 and the cover member 12 are shown in cross section, but are elongated members that extend in the front-to-back direction of the drawing.

[0018] The main body 11 and the cover member 12 are each a long material formed by bending a single metal plate such as steel, stainless steel, or aluminum by pressing, and as shown in FIG. 1, have the cross-sectional shape described below.

[0019] The shape of the main body 11 will be described below. From top to bottom, the main body 11 has a first vertical plate portion 11a for fixing to the side surface of the foundation 101 of the building 100, a first horizontal plate portion 11b that projects horizontally from the lower end of the vertical plate portion 11a, an exterior wall fixing portion 11c that extends upward from the end of the first horizontal plate portion 11b and is folded back, a second vertical plate portion 11d that extends downward from the end of the exterior wall fixing portion 11c, a cover guide portion 11e that causes the end of the second vertical plate portion 11d to protrude toward the foundation 101, and a first fitting groove portion 11f that is recessed upward toward the building 100 from the cover guide portion 11e and opens downward.

[0020] Here, the main body 11 is fixed to the base 101 by nails 110 hammered into nail holes (not shown) opened in the first vertical plate portion 11a. Note that openings 14C are formed intermittently in the first horizontal plate portion 11b, and together with second openings 14B described later, form an air passage in the back-of-wall space 108 formed on the back surface of the exterior wall 107.

[0021] The main body 11 further has a second vertical plate upper portion 11g and a second vertical plate lower portion 11i that extend downward from the end of the first groove portion 11f on the base 101 side. A protrusion portion 11h is formed between the upper and lower portions 11g and 11i, protruding toward the base 101 and extending in the longitudinal direction of the main body 11. The protrusion portion 11h is fixed to the base 101 with a nail 110, with its tip contacting the base 101 in a strip-like manner horizontally.

[0022] Therefore, this protrusion 11h separates the ventilation space 103a on the foundation packing 103 side, which leads to the underfloor space 106 below, from the back-of-wall space 108 above. A first opening 14A is formed in the lower part 11i of the second vertical plate below the protrusion 11h, and a ventilation path F1 is formed that communicates with the ventilation space 103a and further with the underfloor space 106. A second ventilation port 14B is formed in the upper part 11g of the second vertical plate above the protrusion 11h, and a ventilation path F2 that communicates with the back-of-wall space 108 and is independent of the ventilation path F1.

[0023] The lower end of the second vertical plate lower part 11i extends horizontally outward from the building 100 to form a third horizontal plate part 11j, and the tip of that is bent into a groove shape to form a second mating groove part 11k that opens upward.

[0024] In addition, the third horizontal plate portion 11j of the main body 11 and the foundation 102, and the lower end portion of the exterior wall 107 and the exterior wall fixing portion 11c of the main body 11 are installed via watertight members 104 and 109 such as rubber, respectively, thereby ensuring watertightness of the underfloor space 106 and the back-of-wall space 108 inside the building 100.

[0025] Next, the shape of the cover member 12 will be described below. As shown in Fig. 1, the cover member 12 has a cylindrical shape with a gap at one corner. The cover member 12 stands parallel to the outer wall surface of the exterior wall 107 and has a hanging piece 12a, which is an opposing piece that faces the outer wall surface of the main body 11 (upper part 11g of the second vertical plate, protruding part 11h, lower part 11i of the second vertical plate). This hanging piece 12a prevents linear communication between the air vents 14A and 14B on the building 100 side, which will be described later, and the outside air slit 17 on the outside air side, and vertically divides the space within the water-shielding device A into a facing space 18 and an outside air inflow space 19 so as to separate the two (the facing space 18 and the outside air inflow space 19 will be described later).

[0026] When the cover member 12 is attached to the main body 11, the surface 12a1 of the hanging piece 12a facing the building 100 forms an opposing surface 15 that faces the first opening 14A and the second vent hole 14B formed in the lower part 11i and upper part 11g of the second vertical plate of the main body 11. A water-absorbing expansion sheet 16 formed in a strip shape and containing a water-absorbing expansion material is adhered to the opposing surface 15 (the water-absorbing expansion sheet 16 will be described later).

[0027] Furthermore, upper end 12a3 of hanging piece 12a is continuous with bridge piece 12b that extends obliquely toward building 100, while lower end 12a4 of hanging piece 12a is a free end, allowing hanging piece 12a to rotate around its upper portion as a rotation axis. Furthermore, bridge piece 12b has a slit-shaped ventilation space opening 13, which enhances its flexibility.

[0028] The upper end of the bridge piece 12b is further bent horizontally to the outside of the building 100, forming a first protrusion 12c that engages with the first mating groove 11f of the main body 11. The first protrusion 12c is connected to a first horizontal plate 12d that protrudes to the outside of the building 100, and is further bent downward to form a vertical plate 12e.

[0029] The lower end of the vertical plate portion 12e is bent obliquely upward toward the building 100 to form a second horizontal plate portion 12g that serves as a drip edge 12f that protrudes downward at the corner. An outside air slit 17 that is an outside air opening is opened in this second horizontal plate portion 12g.

[0030] Furthermore, the end of the second horizontal plate portion 12g is bent so as to protrude toward the building 100, and a locking portion 12h is formed at the lower end 12a4 of the hanging piece 12a, facing the back surface 12a2 of the hanging piece 12a. Note that at this portion, the hanging piece 12a and the locking portion 12h do not abut, and as will be described later, a gap S is formed that allows water to enter when flooding occurs.

[0031] The engaging portion 12h is bent downwards in a round shape to form a second protruding portion 12i which is fitted into the second fitting groove portion 11k of the main body 11 described above.

[0032] At this time, the water-absorbing expansion sheet 16 attached to the opposing surface 15 of the cover member 12 faces the first ventilation port 14A and the second ventilation port 14B of the main body 11 at a predetermined distance. A facing space 18 is formed here, and this facing space 18 communicates with an outside air inflow space 19 formed between the vertical plate portion 12e of the hanging piece 12a of the cover member 12 and the facing space 18 via the ventilation space opening 13 opened in the bridge piece 12b of the cover member 12. The outside air inflow space 19 and the facing space 18 form the ventilation space of the water-proof device A.

[0033] That is, inside the water-shielding device A, an air passage F is formed that runs from the outside air slit 17 toward the outside air inflow space 19, through the ventilation space opening 13, toward the facing space 18, and through the air vents 14A and 14B. The first air vent 14A communicates with the underfloor space 106 to form an underfloor air passage F1, and the second air vent 14B communicates with the back-of-wall space 108 to form a back-of-wall air passage F2.

[0034] In this embodiment, as described above, there is a gap S between the lower end 12a4 of the hanging piece 12a and the engaging portion 12h. Although this gap S does not function significantly as an air passage, in the event of flooding, it becomes a passage through which water that has entered the outside air inflow space 19 from the outside air slit 17 enters the facing space 18 (the effect of which will be described later).

[0035] The relative relationship between the structure of the vents 14A and 14B of the main body and the water-swelling sheet 16 attached to the opposing surface 15 of the cover member 12 will be described with reference to FIG.

[0036] The water-swelling sheet 16 may be a strip of powdered or fibrous superabsorbent polymer, or a strip of powdered or fibrous superabsorbent polymer laminated on and / or mixed into a web. A web is a thin woven or nonwoven fabric made of short or long fibers. The water-swelling sheet 16 has the property of expanding to several hundred times its volume upon absorbing water, occupying space. When water is absorbed, the particles of the powdered or fibrous superabsorbent polymer expand and gel, softening and deforming, so the water-swelling sheet 16 does not return to its original shape even after drying.

[0037] Therefore, once the water-absorbing expansion sheet 16 has demonstrated its water-absorbing function, it must be replaced in preparation for the next flood. On the other hand, the water-absorbing expansion sheet 16 has a backing that will not crumble even when it absorbs water attached to one side and is then attached to the opposing surface 15 with double-sided tape or adhesive, so that it can be easily peeled off without remaining on the opposing surface 15 when it is replaced.

[0038] As shown in the figure, the ventilation holes 14A and 14B formed in the main body 11 have a shape in which a large number of small holes (multiple holes) are punched in a matrix pattern. The water-absorbing and swelling sheet 16 is disposed opposite the ventilation holes 14A and 14B, and when the water-absorbing and swelling sheet 16 expands, the soft, gelled water-absorbing and swelling sheet 16 closes these small holes and closes the ventilation paths F, F1, and F2.

[0039] 3(a) and 3(b), the waterproofing function of the waterproofing device A of this embodiment will be described. First, as shown in FIG. 3(a), when the surroundings of the building 100 are submerged in water, water also enters the outside air inflow space 19 inside the waterproofing device A through the outside air slits 17.

[0040] At this time, the water that has entered enters the facing space 18 between the vents 14A, 14B and the hanging piece 12a through the gap S formed between the hanging piece 12a and the locking portion 12b of the cover member 12. At this time, the water that flows in through the gap S causes the lower part of the water-absorbing and expanding sheet 16 to absorb water and begin to expand quickly, thereby achieving waterproofing for the vent 14A before the water level rises.

[0041] The infiltrating water then reaches the lower part of the water-absorbing expansion sheet 16 located in the facing space 18, where the water-absorbing expansion sheet 16 absorbs the water and gels, gradually increasing its volume in the facing space 18 from the bottom up, and as described above, first blocks the lower ventilation hole 14A, and then continues to expand, blocking the upper ventilation hole 14B.

[0042] At this time, the flow of water entering through the outside air slit 17 is received by the back surface 12a2 of the hanging piece 12a, so that the water pressure is not directly applied to the water-absorbent expansion sheet 16 fixed to the opposite surface (front surface 12a1). Therefore, the water-absorbent expansion sheet 16 is not washed away or displaced by the water flow.

[0043] As shown in FIG. 3(b), when the entire water-absorbing expansion sheet 16 is gelled, the gelled water-absorbing expansion material 16X fills the entire facing space 18, and its expansion pressure presses against the hanging piece 12a.

[0044] As described above, the hanging piece 12a has a flexible upper end 12a3 due to the function of the bridge portion 12b and a free lower end 12a4, and the lower end 12a4 rotates outward around the upper end 12a3 due to the expansion pressure of the water-absorbing expansion material 16X and abuts against the locking portion 12h on the back surface 12a2. This closes the gap S between them, preventing the infiltration of more water than is necessary to expand the adsorbent expansion sheet 16.

[0045] Therefore, water that cannot pass through this gap S will enter from above the facing space 18 through the opening 13 in the ventilation space located at the top of the cover member 12, but in this state the facing space 18 is filled with gelled water-absorbing expansion material 16X, which prevents water from entering the ventilation holes 14A and 14B.

[0046] 4, a method for attaching and detaching the cover member 12 to the main body 11 will be described. As described above, the main body 11 and the cover member 12 form the water-blocking device A by fitting the first mating groove portion 11f and the second mating groove portion 11k of the main body 11 to the first mating protrusion portion 12c and the second mating protrusion portion 12i of the cover member 12, respectively.

[0047] In addition, since the movement of the hanging piece 12a is stopped by the engaging portion 12h, the expansion pressure of the water-absorbing expansion material 16X that absorbs water and expands is directed toward the front ventilation holes 14A and 14B, and the highly absorbent fibers of the water-absorbing expansion material 16X adhere closely to these small holes, ensuring watertight performance.

[0048] On the other hand, when removing the cover member 12 from the main body 11 fixed to the building 100, the operator places his / her finger on the drain portion 12f of the cover member 12 and deforms the second horizontal plate portion 12g so as to lift it upward, thereby releasing the engagement between the second mating protrusion portion 12i of the cover member 12 and the second mating groove portion 11j of the main body 11.

[0049] Then, by using the first mating protrusion 12c of the cover member 12, which is mated with the first mating groove 11f of the main body 11, as a fulcrum and rotating the lower part of the cover member 12 so as to flip up, the mating between the first mating protrusion 12c and the first mating groove 11f can also be released, and the cover member 12 can be easily removed from the main body 11, i.e., the building 100.

[0050] Therefore, by removing the cover member 12, the hanging piece 12a (opposing surface 15) of the cover member 12 is exposed, so that the used water-absorbing expansion sheet 16 can be removed and easily replaced with a new one, or the cover member 12 can be replaced with a new cover member 12 having an unused water-absorbing expansion sheet 16 attached.

[0051] On the other hand, when the cover member 12 is separated from the main body 11, the ventilation holes 14A and 14B are exposed to the outside of the building 100 together with the second vertical plate portion 11g of the container main body, and even if some of the gelled water-absorbing expansion material 16X remains stuck in the small holes of the ventilation holes 14A and 14B, it can be easily removed with a brush or the like.

[0052] In this way, in the waterproofing device A of this embodiment, the cover member 12 can be easily removed from the main body 11, so it is possible to provide a waterproofing device for a base drain that is easy to maintain.

[0053] [Second embodiment] Next, a water-blocking device B according to a second embodiment of the present invention will be described with reference to Figure 5. The water-blocking device B of this embodiment differs from the water-blocking device A of the first embodiment only in the cover member 22. The main body 11 is the same as that of the water-blocking device A, and is therefore not shown.

[0054] Cover member 22 is constructed by assembling cover portion 22A and hanging piece portion 22B, which are formed separately. Hanging piece portion 22B consists of hanging piece 22a and bridge portion 22b extending obliquely from its upper end. Bridge portion 22b has slit-shaped ventilation space opening 13 formed therein, and each is formed by processing a single metal plate.

[0055] Furthermore, like the water-proofing device A of the first embodiment described above, the cover portion 22A has a first mating protrusion portion 22c at its upper end that matings with the first mating groove portion 11f (see Figure 1) of the main body 11, and is bent outward from its edge to form a first horizontal plate portion 22d, and further bent downward from its edge to form a vertical plate portion 22e.

[0056] Next, the corner of the lower end of vertical plate portion 22e is folded upward to form water drainage portion 22f, forming second horizontal plate portion 22g, which forms outside air slit 17. Then, by folding the edge of second horizontal plate portion 22g facing the building downward, engaging portion 22h that protrudes toward the building is formed at the corner, and below that, second engaging protrusion portion 22i that engages with second engaging groove portion 11k of main body 11 is formed, similar to the water-shielding device A of the first embodiment described above (see FIG. 1).

[0057] Then, engaging portion 22b1, formed by horizontally bending the upper end of bridge portion 22b of hanging piece 22B, is overlapped with engaging portion 22c1, which is the top surface of first mating protrusion 22c of cover portion 22A, as an overlapping margin. In this state, rivet holes 22b2 and 22c2 formed in both are aligned, and rivet 23 is inserted and crimped to integrally connect cover portion 22A and hanging piece 22B, thereby forming cover member 22.

[0058] In the cover member 22 assembled in this manner, similarly to the cover member 12 of the first embodiment, the surface 22a1 of the hanging piece 22a becomes the opposing surface 15 to which the water-absorbing expansion sheet 16 (see FIG. 1) is attached. In addition, a gap S (see FIG. 1) is formed between the back surface 22a2 of the hanging piece 22a and the engaging portion 22h.

[0059] As described above, according to the second embodiment, the cover member 22 can be constructed from a cover portion 22A and a hanging piece portion 22B, which have a simpler shape than the cover member 12 of the first embodiment, and therefore the cover member 22 can be manufactured by a simpler process.

[0060] [Third embodiment] 6 and 7, a water-shielding device C according to a third embodiment of the present invention will be described. The water-shielding device C of this embodiment differs from the water-shielding device A of the first embodiment in that the first air vent 14A serving as an air vent to the underfloor space and the second air vent 14B serving as an air vent to the space behind the wall are replaced by a single air vent. The cover member 22 is the same as the water-shielding device B of the second embodiment in that it is configured by combining a cover portion and a hanging piece portion. Other structures similar to those of the first and second embodiments will be assigned the same reference numerals and will not be described again.

[0061] The main body 11 of the waterproof device C is formed as a flat, smooth second vertical plate portion 11x, instead of the protrusion portion 11h that was formed between the upper second vertical plate portion 11g and the lower second vertical plate portion 11i in the waterproof device A of the first embodiment.

[0062] The lower part of the second vertical plate portion 11x has a vent hole 34 formed in the shape of a strip in the longitudinal direction. As shown in Fig. 6, the main body 11 is fixed to the foundation 101 of the building with nails 110 via a plurality of spacers 20 that are attached intermittently in the longitudinal direction, thereby forming a ventilation space beside these spacers 20, and outside air communicates with the underfloor space 106 and the back-of-wall space 108 through the ventilation hole 34. In other words, the ventilation hole 34 serves as a common ventilation hole for the underfloor space 106 and the back-of-wall space 108.

[0063] As such, according to the waterproofing device C of this embodiment, the shape of the main body 11 can be simplified, so that by eliminating complex processing steps, high dimensional accuracy can be expected and at the same time manufacturing costs can be reduced.

[0064] [Other variations] The water-shielding device of the present invention can also employ variations other than the first to third embodiments described above, as follows.

[0065] In the above embodiment, the main body 11 and the cover member 12 are described as being formed by bending a metal plate, but this is not limited thereto and they can also be formed by extrusion molding. Also, in the cover parts 12, 22, the hanging pieces 12a, 22a and the locking parts 12h, 22h can be made to contact each other so that no gap S is formed between them.

[0066] In the above embodiment, the facing pieces of the present invention are configured as hanging pieces 12a, 22a whose upper ends are connected to the waterproofing devices A, B and whose lower ends are free ends, but they may also be configured as standing pieces whose lower ends are fixed and whose upper ends are free ends. Also, although a band-shaped water-absorbing and swelling sheet is used as the water-absorbing and swelling material, for example, a structure in which granular water-absorbing and swelling material is packed in a mesh bag and attached to the facing surface 15 may also be used.

[0067] In addition, in the above embodiment, the mating grooves 11f and 11k are formed on the main body 11, and the mating ridges 12c and 12i are formed on the cover member, but the formation of the mating grooves and mating ridges may be reversed between the main body 11 and the cover members 12 and 22, and further, a structure in which the two are fixed together with screws or the like may be selected.

[0068] In the above embodiment, the ventilation holes are formed by a large number of small holes, but the shape of the ventilation holes can also be any shape as long as the water-absorbing swelling material that has absorbed water and gelled is fine enough to prevent the absorbed superabsorbent polymer and the superabsorbent fibers that have been layered and kneaded into the web from leaking out, and in addition to being formed by a matrix of small holes, the ventilation holes can also be formed by mesh holes with a specified mesh width. [Explanation of symbols]

[0069] A, B...Water-proofing device for foundation drainage (water-proofing device) 11...Main unit 11f...First fitting groove 11k…Second fitting groove 12, 22 (22A, 22B)...Cover member 12a, 22a...Descent piece (opposing piece) 12a1, 22a1...surface of the pterygium 12a2, 22a2...underside of the dangling piece 12a3...Upper edge of the hanging piece 12a4...Lower edge of the dangling piece 12c, 22c...1st mating protrusion 12i, 22i...Second mating protrusion 13...Opening in ventilation space 14A...First vent (vent to underfloor space) 14B: Second vent (vent to the back of the wall) 15(12a1)...Opposite surface 16...Water-absorbing expansion sheet (water-absorbing expansion material) 17...Outside air slit (outside air opening) 18... Opposite space (ventilation space) 19...Outside air inflow space (ventilation space) 34...Ventilation opening (common ventilation opening to underfloor space and back wall space) 100…Buildings 101...Base 102…Fundamentals 103...Base packing (cat base) 106...Underfloor space 107...Exterior wall 108...Back of the wall space F...Ventilation channel F1...Ventilation path to the underfloor space F2: Ventilation path to the space behind the wall

Claims

1. A waterproofing device for a foundation having an air vent that connects an underfloor space of a building with outside air, and an outside air opening that connects to the air vent through an air vent space and introduces outside air outside the building, The water-blocking device for a foundation drain is characterized in that it has an opposing piece that separates the air vent and the outside air opening within the ventilation space and has an opposing surface facing the air vent, and a water-absorbing expansion material is attached to the opposing surface that expands when it absorbs water and blocks the air vent.

2. The waterproofing device for a foundation drainage according to claim 1, The opposing piece is a hanging piece whose upper side is fixed to the water-proofing device and whose lower side is a free end, and above the hanging piece is formed an opening in the ventilation space that connects to the air vent from outside the building.This is a water-proofing device for foundation drainage.

3. The waterproofing device for a foundation drainage according to claim 2, The water-shielding device of the base water drain has a locking portion facing the back surface of the opposing surface of the hanging piece, and the upper side of the hanging piece is flexible, When the water-absorbing expansion material expands, it presses against the hanging piece, and when the lower end of the hanging piece, which is the free end, moves, the engaging portion abuts against the back surface to restrict the movement of the hanging piece. This is a water-proofing device for foundation drainage.

4. The waterproofing device for a foundation drainage according to claim 1, The water-proofing device for foundation drainage is characterized in that it has a main body having the air vent and fixed to the building, and a cover member having the outside air opening and fixed to the main body in a detachable manner, and the hanging piece is formed on the cover member.

5. A waterproofing device for a foundation drain as described in any one of claims 1 to 4, characterized in that the ventilation holes are formed by either a plurality of punched holes or mesh holes having a predetermined mesh width.

6. A waterproofing device for a foundation drain according to any one of claims 1 to 4, The waterproofing device for foundation drainage further comprises a second ventilation opening that connects the ventilation space with the space behind the wall of the building.

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