Water stop mechanism and repair work method of underfloor ventilation opening

Abstract

To provide a water stop mechanism of an underfloor ventilation opening capable of lowering a water stop plate without any special operation when water accumulated on the ground surface subsides.SOLUTION: A water stop mechanism 1 prevents water immersion through an underfloor ventilation opening 53 provided in a rising portion 52 of a foundation 51 that stands from the ground surface 50. The mechanism includes a guide portion 2 that extends vertically and a water stop plate 3 that is guided and supported by the guide portion 2 at the outdoor side of the rising portion 52. The water stop plate 3 rises due to the buoyancy of water accumulated on the ground surface 50, to cover the underfloor ventilation opening 53, and descends under its own weight as the water recedes from above the ground surface 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waterproofing mechanism for an underfloor ventilation opening and a repair method. [Background technology]

[0002] The following Patent Document 1 describes a water stop mechanism for preventing water from seeping in through an entrance formed in a wall. The water stop mechanism includes a storage groove formed in the ground around the periphery of the entrance, a water channel member that guides water that has flowed outside the wall into the storage groove, and a water stop member that rises from the storage groove due to the water pressure of the water introduced into the storage groove and blocks the entrance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-170312 Summary of the Invention [Problem to be solved by the invention]

[0004] In the water-stopping mechanism described above, even when the water has receded from the ground (disappeared), water remains in the storage groove and the water channel member, so the water-stopping member remains raised from the storage groove. Therefore, in order to lower the water-stopping member into the storage groove, it is necessary to ground a drain valve on the water channel member and operate it to drain the remaining water, which is a problem.

[0005] The present invention was devised in consideration of the above-mentioned circumstances, and its main purpose is to provide a water-stopping mechanism for an underfloor ventilation opening that allows the water stop plate to be lowered without any special operation when the water accumulated on the ground surface has subsided. [Means for solving the problem]

[0006] The present invention is a water-stopping mechanism for preventing water from seeping in through an underfloor ventilation opening provided at a rising portion of a foundation that rises from the ground surface, and includes a guide portion that extends vertically on the outdoor side of the rising portion, and a water-stop plate that is guided and supported by the guide portion, and the water-stop plate rises due to the buoyancy of water accumulated on the ground surface to cover the underfloor ventilation opening, and then descends under its own weight as the water recedes from the ground surface. [Effects of the Invention]

[0007] By adopting the above-described configuration, the water stop mechanism for the underfloor ventilation opening of the present invention can lower the water stop plate without any special operation when the water accumulated on the ground surface has subsided. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 10 is a perspective view showing an example of a water stopping mechanism. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 2 is an enlarged view of the guide portion of FIG. [Figure 4] 2 is a cross-sectional view showing the water stop mechanism of FIG. 1 when the water level rises. FIG. [Figure 5] 10 is a flowchart showing an example of a processing procedure of a repair work method. [Figure 6] FIG. 10 is a perspective view of a guide portion according to another embodiment. [Figure 7] 10A and 10B are perspective views of a position restriction tool according to another embodiment. [Figure 8] 10A is a front view of a position regulation tool according to another embodiment, and FIGS. 10B and 10C are cross-sectional views taken along line BB in FIG. [Figure 9] FIG. 10 is a perspective view of a water stopping mechanism according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings include exaggerated representations and representations that differ from the dimensional ratios of the actual structure to facilitate understanding of the contents of the invention. Furthermore, identical or common elements are designated by the same reference numerals throughout the embodiments, and redundant explanations may be omitted. Furthermore, the specific configurations shown in the embodiments and drawings are intended to facilitate understanding of the contents of the present invention. Therefore, the present invention is not limited to the specific configurations shown in the drawings.

[0010] In each figure, the directions indicated by arrows X and Y are directions along the horizontal plane and are perpendicular to each other. The direction indicated by arrow Z is a direction along the vertical direction (up and down). In each figure, the directions indicated by arrows X, Y, and Z are assumed to be consistent with each other.

[0011] FIG. 1 is a perspective view of a water stop mechanism 1 of this embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. As shown in FIG. 1 or 2, the water stop mechanism 1 is provided in a rising portion 52 of a foundation 51 rising from a ground surface 50. The foundation 51 is, for example, the foundation of a building, more specifically, a general residential or apartment building. The rising portion 52 is provided with an underfloor ventilation opening 53 for ventilating an underfloor space 54 located below the building. In FIG. 1, the front side (left side) of the underfloor ventilation opening 53 is the outdoor side, and the back side (right side) of the underfloor ventilation opening 53 is the indoor side.

[0012] An exterior wall 55 of the building is provided on the foundation 51. The exterior wall 55 is disposed so as to protrude further outdoors than the rising portion 52. For example, an outdoor surface (outer surface) 55a of the exterior wall 55 is disposed closer to the outdoors than an outdoor surface (outer surface) 52a of the rising portion 52. The exterior wall 55 is attached to a base 56 disposed on an upper end 52e of the rising portion 52, for example.

[0013] The underfloor ventilation opening 53 is provided, for example, so as to be recessed downward from the upper end 52e of the rising portion 52. In this embodiment, the underfloor ventilation opening 53 is formed so as to be surrounded by the base 56 and the rising portion 52. The underfloor ventilation opening 53 may be formed, for example, so as to be surrounded on all sides by the rising portion 52. In this embodiment, the underfloor ventilation opening 53 is formed in a rectangular shape when viewed from the front of the rising portion 52, but the shape is not particularly limited and may be, for example, circular or elliptical. Note that an intrusion prevention device (not shown), such as a wire mesh, may be provided inside the underfloor ventilation opening 53 to prevent small animals such as mice and insects from invading the underfloor space 54.

[0014] The water stop mechanism 1 has the function of ensuring underfloor ventilation through the underfloor ventilation openings 53 under normal circumstances when water W (shown in Figure 4) does not accumulate on the ground surface 50, and when water W accumulates on the ground surface 50 due to heavy rain or the like (when the water level rises), covering the underfloor ventilation openings 53 to prevent water from entering the underfloor space 54 from the outdoors. Figures 1 and 2 show the state of the water stop mechanism 1 under normal circumstances. In this specification, water W refers to rainwater or flooding (including seawater) caused by river overflows due to heavy rain.

[0015] The water stop mechanism 1 includes a guide portion 2 that extends vertically, and a water stop plate 3 that is guided and supported by the guide portion 2. The guide portion 2 and the water stop plate 3 are each disposed on the outdoor side of the rising portion 52.

[0016] The waterstop 3 rises due to the buoyancy of the water W accumulated on the ground surface 50 to cover the underfloor ventilation opening 53, and has the function of descending under its own weight as the water W recedes from the ground surface 50.

[0017] The waterstop 3 is formed, for example, in the shape of a thick plate having a constant (same) thickness. In this embodiment, the waterstop 3 is desirably rectangular in shape when viewed from the front at the rising portion 52. The waterstop 3 is not particularly limited as long as it can rise due to the buoyancy of the water W, but resin materials such as polyethylene, polypropylene, EVA resin, and fiber-reinforced resin are suitably used. The waterstop 3 may also be formed from a porous structure such as polystyrene foam, styrene board, or polyurethane foam, or a hollow structure made of resin or metal.

[0018] FIG. 3 is an enlarged view of the guide unit 2 of FIG. 1. As shown in FIG. 3, the guide unit 2 has, for example, a pair of guide frames 4 extending vertically. Each guide frame 4 includes, for example, a first guide piece 7, a second guide piece 8 extending from one end 7e of the first guide piece 7 to one side, and a third guide piece 9 extending from the other end 7i of the first guide piece 7 to the other side opposite the second guide piece 8. Each guide frame 4 is arranged so that the second guide piece 8 is located closer to the exterior than the third guide piece 9, and the third guide piece 9 is attached to the rising portion 52 (shown in FIGS. 1 and 2). Such a guide frame 4 facilitates attachment to the rising portion 52 and improves installation workability. The length and installation position of the guide frame 4 can be changed as appropriate as long as it can guide and support the waterstop 3.

[0019] A storage chamber 6 is formed between each guide frame 4 to store the waterstop 3. The waterstop 3 stored in the storage chamber 6 is restricted from moving in the X direction by each first guide piece 7, and restricted from moving in the Y direction by each second guide piece 8.

[0020] Fig. 4 is a cross-sectional view showing the state of the water stop mechanism 1 when the water level rises. As shown in Figs. 2 and 4, in this embodiment, the water stop mechanism 1 includes a position restricting device 5 for restricting the raised position of the water stop 3. Such a position restricting device 5 can prevent the water stop 3 from moving away from the guide portion 2 when the water level rises, for example. Furthermore, the position restricting device 5 can prevent water from entering from below the underfloor ventilation opening 53 by preventing the lower end 3i of the water stop 3 from rising higher than the lower end 53i of the underfloor ventilation opening 53 when the water level rises, for example.

[0021] In this embodiment, the position regulating device 5 is the outer wall 55. In other words, the lower end 55i of the outer wall 55 abuts against the upper end 3e of the waterstop 3, which has risen due to the buoyancy of the water W, thereby functioning to regulate (stop) the rising position of the waterstop 3. When in this raised position, the waterstop 3 is desirably shaped and positioned to cover the underfloor ventilation opening 53. Note that the lower end 3i of the waterstop 3 is located below the upper end 4e of the guide frame 4, thereby ensuring the function of guiding and supporting the guide portion 2 to the waterstop 3.

[0022] It is desirable that the water stop mechanism 1 has a packing (not shown) to improve the watertightness between the water stop 3 and the rising portion 52 or the guide portion 2, thereby further preventing water from entering the underfloor space 54. The packing is provided, for example, on the water stop 3, the guide portion 2, the rising portion 52, the outer wall 55, or the base 56. Well-known packings are used as the packing.

[0023] Next, the operation of the water stop mechanism 1 of this embodiment will be described. As shown in Figures 1 and 2, under normal circumstances when water W is not accumulated on the ground surface 50, the water stop plate 3 of the water stop mechanism 1 is in a state of contact with the ground surface 50 due to gravity, in this embodiment. Also, under these normal circumstances, the underfloor ventilation opening 53 is in a state where it can ventilate the underfloor space 54.

[0024] Next, when water levels rise due to heavy rain or flooding, as water W begins to accumulate on the ground surface 50, the buoyancy of the water W causes the waterstop 3 to rise while being guided and supported by the guide frame 4. As the water W accumulates further, the upper end 3e of the waterstop 3 comes into contact with the lower end 55i of the exterior wall 55, as shown in FIG. 4. Furthermore, the waterstop 3 is positioned so as to cover the underfloor ventilation opening 53, thereby preventing water from seeping in through the underfloor ventilation opening 53. At this time, the water W applies water pressure (pressing force) to the waterstop 3 in a direction that presses it against the rising portion 52. Note that if the above-mentioned packing is provided, watertightness is improved, thereby ensuring a high level of water seepage prevention effectiveness.

[0025] When the water W recedes from the ground surface 50, the waterstop 3 also descends while being guided and supported by the guide frame 4. When the water W disappears from the ground surface 50 and the ground surface 50 returns to normal, the waterstop 3 returns to its lowest position, in this embodiment, a state in which it is in contact with the ground surface 50. In this way, with the waterstop mechanism 1 of this embodiment, when the water W recedes from a period of high water level, the waterstop 3 can be lowered without any special operation.

[0026] Furthermore, in the water-stopping mechanism 1 of this embodiment, the guide portion 2 and the water stop 3 are provided on the outdoor side of the rising portion 52. Therefore, it can be easily attached to the underfloor ventilation opening 53 of an existing building (residence). As such, the water-stopping mechanism 1 of this embodiment can be said to be excellent in maintainability and ease of installation in existing buildings. Furthermore, for example, in a water-stopping mechanism in which the guide portion 2 and the water stop 3 are provided inside the underfloor ventilation opening 53 (hereinafter referred to as the "exemplary water-stopping mechanism" and not shown), the guide portion 2 and the water stop 3 reduce the ventilation volume. Therefore, in the exemplary water-stopping mechanism, the opening area of ​​the underfloor ventilation opening 53 needs to be increased to ensure the ventilation volume, which may reduce the strength of the foundation 51 (rising portion 52) and, ultimately, the strength of the building. On the other hand, the water-stopping mechanism 1 of this embodiment does not reduce the opening area of ​​the underfloor ventilation opening 53 under normal conditions, ensuring the ventilation volume, and therefore does not have the problem of reduced strength.

[0027] Furthermore, in the above-described exemplary water stop mechanism, the water stop plate begins to float up only when the water level rises to the lower end 53i of the underfloor ventilation opening 53. Therefore, in the above-described exemplary water stop mechanism, for example, in the event of a sudden increase in water volume, there is a risk that water will enter the underfloor ventilation opening 53 before the water stop plate 3 covers it. In contrast, in the water stop mechanism 1 of this embodiment, the water stop plate 3 is in contact with the ground surface 50 under normal conditions, so the water stop plate 3 begins to float up from the early stage of a water rise. Therefore, in the water stop mechanism 1 of this embodiment, it can be said that the height from the ground surface 50 to the lower end 53i of the underfloor ventilation opening 53 can reliably prevent water from entering through the underfloor ventilation opening 53, even in the event of a sudden increase in water volume.

[0028] Next, a repair method for installing the water stop mechanism 1 of this embodiment in the underfloor ventilation opening 53 of an existing building will be described. Fig. 5 is a flowchart of the repair method of this embodiment. As shown in Fig. 5, the repair method includes a step S1 of placing the water stop 3 and a step S2 of attaching the guide part 2.

[0029] First, a step S1 of placing the waterstop 3 (waterstop placing step) is performed. In the waterstop placing step S1, the waterstop 3 is placed on the outdoor side of the rising portion 52. Specifically, in the waterstop placing step S1, the waterstop 3 is placed on the outdoor side of the underfloor ventilation opening 53. It is desirable to place the waterstop 3 so that the horizontal center 3c of the waterstop 3 (X direction) and the horizontal center 53c of the underfloor ventilation opening 53 are in the same position in the X direction.

[0030] Next, a step S2 of attaching the guide portion 2 (guide portion attaching step) is performed. In the guide portion attaching step S2, the guide portion 2 is attached to the outdoor side of the rising portion 52. Specifically, in the guide portion attaching step S2, the guide frame 4 is attached so that the waterstop 3 can move up and down by the buoyancy of the water W. In this embodiment, the third guide piece 9 can be attached to the rising portion 52 by screws or the like. In this way, the waterstop mechanism 1 of this embodiment can be easily attached to the underfloor ventilation opening 53 of an existing building. Note that the renovation construction method is not limited to this embodiment, and may, for example, include a step of attaching the guide portion 2 and, after this step, a step of fitting the waterstop 3 into the accommodation chamber 6 of the guide portion 2 (not shown).

[0031] FIG. 6 is a perspective view of a guide unit 2 according to another embodiment. As shown in FIG. 6, the guide unit 2 includes, for example, a joint 10 connecting a pair of guide frames 4. The joint 10 is provided to connect, for example, the second guide pieces 8. This guide unit 2 can prevent damage to the waterstop 3 caused by driftwood or debris carried along with the water W during flooding. The joint 10 also reduces the pressing force of the water W on the waterstop 3, thereby enabling the waterstop 3 to rise and fall smoothly. In this guide unit 2, it is desirable to provide a gap S separating the joint 10 from the ground surface 50. This allows the waterstop 3 to generate buoyancy due to the water W from the early stages of flooding.

[0032] FIG. 7(A) is a perspective view of a position regulating device 5 in normal operation according to another embodiment. FIG. 7(B) is a perspective view of a position regulating device 5 in flooded operation according to another embodiment. As shown in FIG. 7, the position regulating device 5 in this embodiment is a protrusion 11 provided on the lower end of the waterstop 3. The protrusion 11 in this embodiment is integrally molded with the waterstop 3. The waterstop 3 in this embodiment comprises the protrusion 11 and a main body 12 extending upward from the protrusion 11 and having a thickness smaller than that of the protrusion 11. The main body 12 is capable of moving up and down within the storage chamber 6 of the guide frame 4. The protrusion 11 functions as a position regulating device 5 when its upper end 11e abuts against the lower end 4i of the guide frame 4. When the upper end 11e abuts against the lower end 4i of the guide frame 4, the underfloor ventilation opening 53 is covered by the waterstop 3. As described above, the waterstop 3 in this embodiment is formed in a substantially L-shape in a side view. The width w3 of the protrusion 11 may be the same as the width w4 of the main body 12, or may be larger than the width w4 of the main body 12.

[0033] FIG. 8(A) is a front view of a position restriction device 5 of another embodiment. FIG. 8(B) is a cross-sectional view taken along line BB of (A) showing the normal state, and FIG. 8(C) is a cross-sectional view taken along line BB of (A) showing the state when the water level rises. As shown in FIG. 8, the position restriction device 5 of this embodiment is a small piece 15 provided at the upper end 4e of each guide frame 4. The small piece 15 is provided so as to abut against the waterstop 3 that has risen due to the buoyancy of the water W. In this embodiment, the small piece 15 is provided so as to form the upper end 8e of one of the second guide pieces 8. However, the small piece 15 is not limited to this embodiment, and may be provided, for example, on the third guide piece 9, the first guide piece 7, or at least two of the guide pieces 7 to 9 (not shown).

[0034] 9 is a perspective view of a waterstop mechanism 1 of another embodiment. In the waterstop mechanism 1 of this embodiment, the waterstop 3 is placed on a foundation 58 that is placed above the ground surface 50. The top surface 58a of the foundation 58 is horizontal. Such a foundation 58 helps to keep the waterstop 3 stable under normal conditions.

[0035] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment and can be modified and implemented in various ways.

[0036] [Note] The present invention includes the following aspects.

[0037] [Invention 1] A water-stop mechanism for preventing water from entering through underfloor ventilation openings installed in the rising part of the foundation that rises from the ground surface, A guide portion extending vertically is provided on the outdoor side of the rising portion, and a water stop plate is guided and supported by the guide portion, The waterstop rises due to the buoyancy of water accumulated on the ground surface to cover the underfloor ventilation opening, and then descends under its own weight as the water recedes from the ground surface. Water stop mechanism for underfloor ventilation opening. [Invention 2] The water-stopping mechanism for an underfloor ventilation opening according to the first aspect of the present invention, wherein the guide portion includes a pair of guide frames extending vertically on both horizontal outer sides of the underfloor ventilation opening. [Invention 3] 3. A water stopping mechanism for an underfloor ventilation opening according to claim 1 or 2, comprising a position restricting device for restricting the raised position of the water stop plate. [Invention 4] The water stopping mechanism for an underfloor ventilation opening according to the third aspect of the present invention, wherein the position regulating device is an exterior wall on the foundation that is arranged so as to be able to abut against the upper end side of the water stop. [Invention 5] The position control device is a convex portion provided on the lower end side of the water stop plate, and the convex portion abuts against the lower end side of the guide portion, in a water stop mechanism for an underfloor ventilation opening described in Invention 3. [Invention 6] A renovation method for preventing water from entering through underfloor ventilation openings installed in the rising part of a foundation rising from the ground surface, a step of placing a water stop on the outdoor side of the rising portion, the water stop rising due to the buoyancy of the water accumulated on the ground surface to cover the underfloor ventilation opening and descending under its own weight as the water recedes from the ground surface; and attaching a guide portion extending vertically to guide and support the waterstop to the outdoor side of the rising portion. How to renovate underfloor ventilation. [Explanation of symbols]

[0038] 1. Water-stopping mechanism 2 Guide section 3 Waterstop 50 Ground surface 51 Basics 52 Rising section 53 Underfloor ventilation

Claims

1. A water-stop mechanism for preventing water from entering through underfloor ventilation openings installed in the rising part of the foundation that rises from the ground surface, A guide portion extending vertically is provided on the outdoor side of the rising portion, and a water stop plate is guided and supported by the guide portion, The waterstop rises due to the buoyancy of water accumulated on the ground surface to cover the underfloor ventilation opening, and then descends under its own weight as the water recedes from the ground surface. Water stop mechanism for underfloor ventilation opening.

2. The water stopping mechanism for an underfloor ventilation opening according to claim 1 , wherein the guide portion includes a pair of guide frames extending vertically on both horizontal outer sides of the underfloor ventilation opening.

3. The water stop mechanism for an underfloor ventilation opening according to claim 1 or 2, further comprising a position restricting device for restricting an elevated position of the water stop plate.

4. The water stopping mechanism for an underfloor ventilation opening according to claim 3 , wherein the position regulating device is an exterior wall on the foundation that is arranged so as to be able to abut against an upper end side of the water stop plate.

5. The water stopping mechanism for an underfloor ventilation opening according to claim 3 , wherein the position regulating device is a convex portion provided on the lower end side of the water stop plate, and the convex portion abuts against the lower end side of the guide portion.

6. A renovation method for preventing water from entering through underfloor ventilation openings installed in the rising part of a foundation rising from the ground surface, a step of placing a water stop on the outdoor side of the rising portion, the water stop rising due to the buoyancy of the water accumulated on the ground surface to cover the underfloor ventilation opening and descending under its own weight as the water recedes from the ground surface; and attaching a guide portion extending vertically to guide and support the waterstop to the outdoor side of the rising portion. How to renovate underfloor ventilation.

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