Water stop device, and installation method of water stop device

Abstract

To provide a water stop device capable of preventing the generation of a gap between upper and lower water stops due to the deflection of the upper water stop.SOLUTION: A water stop device is configured to stop a water flow in a direction crossing water stops by a lower water stop 10, and an upper water stop 20 stacked on the lower water stop 10, which is more flexible than the lower water stop 10. The water stop device is configured so that, when the upper water stop 20 bends downstream, an engaged part 31 formed on the upper water stop 20 engages with an engaging portion 32 provided on the lower water stop 10.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a water stop device that closes the openings of buildings and subways with a water stop plate during water level rise to prevent water intrusion, and a method for installing this water stop device.

Background Art

[0002] When water level rises due to typhoons, heavy rainstorms, etc. and intrudes into the openings of buildings and subways, there is a risk of causing significant damage due to flooding. Therefore, in preparation for such a situation, columns are erected opposite each other on both sides of the openings of buildings, subways, etc. in advance, and a plate-shaped water stop plate is stored near these columns. When water level rise occurs, the water stop plate is attached to the columns to close the openings and prevent water intrusion (see Patent Document 1). By the way, according to such a conventional technique, when a water level rise higher than the height of the water stop plate is expected, there is a risk that the water level rise will exceed the water stop plate. Therefore, it is conceivable to connect a newly installed water stop plate vertically to an existing water stop plate so as to be able to cope with a higher water level rise. And when doing so, since the lower water stop plate receives a greater water pressure than the upper water stop plate, it is preferable to increase the strength by increasing the thickness or the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, according to the above configuration, there is a possibility that the amount of deflection when the upper water stop plate and the lower water stop plate are subjected to water pressure will be different. Usually, since the upper water stop plate has a smaller thickness and lower bending strength, it tends to have a larger amount of deflection than the lower water stop plate when subjected to water pressure. And in such a case, a gap is formed between the upper water stop plate with a large amount of deflection and the lower water stop plate with a small amount of deflection, and there is a risk that the water stop performance will be impaired by water passing through this gap.

Means for Solving the Problems

[0005] In view of such problems, one aspect of the present invention has the following configuration. In a water stop device that uses a lower water stop plate and an upper water stop plate stacked above the lower water stop plate and that is more easily deflected than the lower water stop plate to block the water flow in a direction intersecting these water stop plates, when the upper water stop plate attempts to deflect downstream, a locked portion provided on the upper water stop plate is locked to a locking portion provided on the lower water stop plate. A water stop device characterized by this.

Effects of the Invention

[0006] Since the present invention is configured as described above, it is possible to prevent the upper water stop plate from deflecting more than the lower water stop plate and generating a gap between the upper and lower water stop plates.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

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Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0008] Next, embodiments according to the present invention will be described in detail with reference to the drawings. In the following description, "inside in the lateral direction" means a direction toward the inside along the lateral direction of the lower water stop plate 10 and the upper water stop plate 20. Also, "outside in the lateral direction" means a direction toward the outside along the lateral direction of the lower water stop plate 10 and the upper water stop plate 20. Therefore, for example, inside in the lateral direction from the right vertical watertight part 13b1 means the left side of the right vertical watertight part 13b1.

[0009] The water stop device 1 includes a lower water stop plate 10, an upper water stop plate 20 stacked above the lower water stop plate 10, left and right support columns 51, 51 that receive these upper and lower water stop plates from the downstream side at one end side and the other end side in the lateral direction, a locked part 31 and a locking part 32 that suppress the upper water stop plate 20 from bending downstream relative to the lower water stop plate 10, and a connecting watertight material 40 (see FIG. 8) that maintains the watertightness of the lower water stop plate 10 and the upper water stop plate 20 with respect to each support column 51 in the vertical direction, and is attached to the housing X so as to block the water flow in the direction intersecting the lower water stop plate 10 and the upper water stop plate 20.

[0010] This water stop device 1 replaces the left and right columns 151, 151 of the existing water stop device 100 (see Fig. 10) with columns 51, 51 having an extended length, and uses the existing water stop plate 120 as the upper water stop plate 20 to increase the water stop height. The means for fixing the water stop plate 120 to the left and right columns 131, 131 is by a well-known dedicated locking tool (not shown). oh

[0011] The body X is, for example, a building made of reinforced concrete or a structure such as an underground passage. This body X has an opening Xa (for example, an opening of an automatic door, an opening of an underground passage, or other openings through which people and objects can pass) communicating with the outside, and a threshold surface Xb below this opening Xa. According to an example shown in Fig. 1, assuming the outside of the body X is the upstream side and the inside of the body X is the downstream side, the flow direction of water due to floods or the like during disasters is assumed.

[0012] The lower water stop plate 10 integrally includes a rectangular plate-shaped main body plate 11, a plurality of hanging parts 12 fixed to the surface of the main body plate 11, a lower watertight member 13 provided on the downstream side surface of the main body plate 11, and a hanging part 14 for hanging the lower water stop plate 10 on the column 51.

[0013] The lower watertight member 13 connects a lateral watertight material 13a that protrudes downward from the lower end of the main body plate 11 and is continuous in the lateral direction, vertical watertight materials 13b that protrude downstream on the left and right end sides of the main body plate 11 and are continuous in the vertical direction, and an auxiliary watertight part 13d provided at the upper end of the vertical watertight material 13b without gaps (see Fig. 4). These watertight materials are formed by appropriately cutting an integral long watertight material made of an elastic material such as rubber or elastomer resin to an appropriate length.

[0014] The lateral watertight material 13a is continuously substantially horizontally over substantially the entire width of the main body plate 11 and is connected to the main body plate 11 by appropriate connection means (for example, fitting, adhesion, etc.). This lateral watertight member 13a is elastically deformed by being pressed against the sill surface Xb of the housing X in a watertight manner over substantially the entire length in the lateral width direction.

[0015] Each of the left and right vertical watertight members 13b is composed of a vertical watertight portion 13b1 that extends continuously in the vertical direction along the main body plate 11 and a connecting watertight portion 13b2 that contacts the lower end of the vertical watertight portion 13b1 and the downstream side surface of the lateral watertight member 13a.

[0016] The vertical watertight portions 13b1 are continuous in the vertical direction (substantially vertical according to the illustrated example) at one end side and the other end side in the lateral width direction on the downstream side surface of the main body plate 11, and are connected to the main body plate 11 by appropriate connecting means (for example, fitting, adhesion, etc.). Each vertical watertight portion 13b1 is elastically deformed by being pressed against the support column 51 in a watertight manner over substantially the entire length in the vertical direction.

[0017] The connecting watertight portion 13b2 is formed over the thickness direction of the main body plate 11. One end side thereof is pressed or adhered to the lower end side of the vertical watertight portion 13b1, and the other end side is pressed or adhered to the end side of the lateral watertight member 13a, and is connected to the main body plate 11 by appropriate connecting means (for example, fitting, adhesion, etc.). This connecting watertight portion 13b2 presses the downstream end portion thereof against the support column 51, and continuously presses against the sill surface Xb from the position where it contacts the vertical watertight portion 13b1 to the position where it contacts the lateral watertight member 13a, and is elastically deformed, continuously connecting the vertical watertight portion 13b1 and the lateral watertight member 13a so as to prevent water leakage between them.

[0018] The auxiliary watertight portion 13d is formed in a flat plate shape that covers the upper end portions of the respective vertical watertight portions 13b1 and the upper end portion of the main body plate 11, and is connected to the main body plate 11 by appropriate connecting means (for example, fitting, adhesion, etc.). This auxiliary watertight portion 13d makes the vertical watertight portions 13b1, 13b1 between the upper and lower water stop plates in watertight contact when water stop plates having the same structure as the lower water stop plate 10 are continuously provided vertically. In this water stop device 1, it is also possible to omit this auxiliary watertight portion 13d.

[0019] On both side surfaces of the main body plate 11, latching portions 14 are provided at the upper end side and the lower end side, respectively (see Fig. 2). Each latching portion 14 is formed by rotatably supporting a roller on the protruding end side of a shaft portion that protrudes outward in the lateral width direction from the main body plate 11. This latching portion 14 detachably fits into a latched portion 52 on the lower end side of the support column 51, and presses the lower water stop plate 10 against the support column 51.

[0020] The upper water stop plate 20 integrally includes a rectangular plate-shaped main body plate 21, a plurality of handle portions 22 fixed to the upper end of the main body plate 21, and an upper watertight member 23 provided on the downstream side surface of the main body plate 21. This upper water stop plate 20 is configured to be more easily bent than the lower water stop plate 10 by making the thickness of its main body plate 21 smaller than the thickness of the main body plate 11 of the lower water stop plate 10. For this reason, the upper water stop plate 20 has a smaller bending strength than the lower water stop plate 10, and when receiving water flow, it is more easily bent in an arcuate shape than the lower water stop plate 10.

[0021] Here, as a specific example of the configuration for making the upper water stop plate 20 more easily bent than the lower water stop plate 10, the section modulus of the upper water stop plate 20 is made smaller than the section modulus of the lower water stop plate 10. That is, the bent state and the amount of bending of the upper water stop plate 20 can be represented by the schematic diagram and the mathematical formula shown in Fig. 11. In these schematic diagram and mathematical formula, δ is the amount of bending, W is the load, L is the lateral length (width), E is the longitudinal elastic modulus, and I is the second moment of area. The lower water stop plate 10 can also be represented by similar schematic diagrams and mathematical formulas.

[0022] And in the mathematical formula of Fig. 11, the second moment of area I can be obtained from the following formula. I = Ze Z: Section modulus, e: Distance of the centroid

[0023] In a preferred example of the invention of the present application, the cross-sectional second moment and the section modulus of the upper water stop plate 20 are made smaller than those of the lower water stop plate 10, and the cross-sectional shapes of the main body plates 21 and 11, the distance between the centers of gravity, etc. are appropriately set.

[0024] The main body plate 21 is smaller in thickness and smaller in widthwise dimension than the main body plate 11 of the lower water stop plate 10. An upper watertight member 23 having a smaller total length in the widthwise direction than the lower watertight member 13 is attached to the downstream side surface of the main body plate 21.

[0025] The upper watertight member 23 connects a lateral watertight material 23a that protrudes downward from the lower end of the main body plate 21 and is continuous in the lateral direction, and vertical watertight materials 23b that protrude downstream on the left and right end sides of the main body plate 21 and are continuous in the vertical direction (see Fig. 4). These watertight materials are formed, like the lower watertight member 13, by appropriately cutting an integrally long watertight material made of an elastic material such as rubber or an elastomer resin to an appropriate length.

[0026] The lateral watertight material 23a is continuously arranged substantially horizontally over substantially the entire length of the main body plate 21 in the widthwise direction, and is connected to the main body plate 21 by appropriate connecting means (for example, fitting, adhesion, etc.). This lateral watertight material 23a is in watertight pressure contact with the upper end portion of the lower water stop plate 10 over substantially the entire length in the widthwise direction and is elastically deformed.

[0027] Each of the left and right vertical watertight materials 23b is composed of a vertical watertight portion 23b1 that is continuously long in the vertical direction along the main body plate 21, and a connecting watertight portion 23b2 that contacts the lower end of the vertical watertight portion 23b1 and the downstream side surface of the lateral watertight material 23a.

[0028] The vertical watertight portion 23b1 is continuous in the vertical direction (substantially vertical according to the illustrated example) at each of one end side and the other end side in the widthwise direction on the downstream side surface of the main body plate 21, and is connected to the main body plate 21 by appropriate connecting means (for example, fitting, adhesion, etc.). Each of the left and right vertical watertight portions 23b1 is elastically deformed by being watertightly pressed against the support column 51 over substantially the entire length in the vertical direction at a position in the width direction different from that of the vertical watertight portion 13b1 of the lower water stop plate 10 (inside in the width direction with respect to the vertical watertight portion 13b1 in the illustrated example).

[0029] The connecting watertight portion 23b2 is formed to extend in the thickness direction of the main body plate 21. One end side thereof is pressed or adhered to the lower end side of the connecting watertight portion 23b2, and the other end side is pressed or adhered to the end side of the lateral watertight material 23a, so that it is connected to the main body plate 21 by appropriate connecting means (for example, fitting, adhesion, etc.). The downstream end of this connecting watertight portion 23b2 is pressed against the support column 51, and it elastically deforms by continuously contacting the lower connecting watertight material 40 from the position where it contacts the vertical watertight portion 23b1 to the position where it contacts the lateral watertight material 23a (see Fig. 8(b)), continuously connecting the vertical watertight portion 23b1 and the lateral watertight material 23a so as to prevent water leakage between them.

[0030] The locked portion 31 and the locking portion 32 are provided to lock the upper water stop plate 20 to the lower water stop plate 10 when the upper water stop plate 20 tends to deflect downstream relative to the lower water stop plate 10 (see Fig. 7). These locked portion 31 and locking portion 32 are provided at least at the central portions in the width direction of the lower water stop plate 10 and the upper water stop plate 20, and are continuous over substantially the entire length in the width direction of the lower water stop plate 10 and the upper water stop plate 20 in the illustrated example.

[0031] The locked portion 31 is provided inside the thickness of the main body plate 21, upstream of the lateral watertight material 23a, at the lower end of the upper water stop plate 20. This locked portion 31 has a concave vertical cross-section that is continuous in the width direction. This locked portion 31 utilizes an existing concave portion formed in an existing water stop plate 120 (see Fig. 10) that constitutes the upper water stop plate 20. As another example, a locked portion 31 of a separate member may be newly provided at the lower end of the upper water stop plate 20.

[0032] The engaging portion 32 is provided at the upper end of the lower water stop plate 10 so as to fit into the engaged portion 31. The engaging portion 32 illustrated in FIG. 7 integrally has an upward convex protruding piece portion 32a that fits into the engaged portion 31 within the thickness of the upper water stop plate 20, and a fixing piece portion 32b that fits into and is fixed to the corner portion on the upstream side of the lower water stop plate 10, and has a crank-shaped longitudinal cross-section continuously extending in the lateral width direction. This engaging portion 32 is retrofitted to the lower water stop plate 10 before the stacking operation when the upper water stop plate 20 is stacked on the lower water stop plate 10.

[0033] Also, the connecting watertight material 40 is sandwiched between the main body plate 11 of the lower water stop plate 10 and the support column 51 and elastically contracts (see FIG. 9), presses against both the vertical watertight portion 13b1 of the lower watertight member 13 and the connecting watertight portion 23b2 of the upper watertight member 23, and further presses against the lateral watertight material 23a and the auxiliary watertight portion 13d (see FIG. 8(a)).

[0034] This connecting watertight material 40 is formed in a block shape (cubic shape according to the illustrated example) from an elastic material (such as rubber or elastomer resin), is supported from below by the receiving member 41, and is integrally connected to the main body plate 11 of the lower water stop plate 10 (see FIG. 3).

[0035] According to the illustrated example, the receiving member 41 is an L-shaped angle member made of a hard material such as a metal material. One piece thereof is fixed to the downstream side surface of the lower water stop plate 10, and the other piece receives the connecting watertight material 40 from below.

[0036] According to the illustrated example, the means for fixing the receiving member 41 to the lower water stop plate 10 is screw fastening, but it is also possible to use rivet fastening, fitting, adhesion, welding, etc.

[0037] As the means for integrally connecting the connecting watertight material 40 to the main body plate 11 or the receiving member 41, for example, adhesion using an adhesive material (including double-sided tape and adhesive) may be used, but it is also possible to use fitting, screw fastening, rivet fastening.

[0038] The support columns 51 are fixed vertically on the upstream side surface of the housing X on the left and right sides of the opening Xa respectively. Each support column 51 is a long member with a substantially flat upstream side surface continuous in the vertical direction, and is formed, for example, in a prismatic shape.

[0039] On the lower half side of the upstream side surface of the support column 51, the engaged portions 52 are fixedly attached to the outside in the lateral width direction, and the vertical waterproof material 13b of the lower waterproof plate 10, the connecting waterproof material 40, etc. are pressed against the inside in the lateral width direction (see Fig. 9). Also, on the upper half side of the support column 51, the vertical waterproof material 23b of the upper waterproof plate 20 is pressed against it.

[0040] A plurality of engaged portions 52 are provided corresponding to the engaging portions 14 of the lower waterproof plate 10. Each engaged portion 52 is formed in a substantially concave shape in a side view with the upstream side open, and detachably engages the engaging portion 14 inserted from the upstream side. In the figure, reference numeral 52a is a bracket that integrally connects the upper and lower engaged portions 52, 52 and is fixed to the support column 51.

[0041] <Regarding the installation method of the waterproof device> Next, regarding the waterproof device 1 having the above configuration, the features in its installation method will be described in detail. When using the existing waterproof plate 120 as the upper waterproof plate 20 and installing a new lower waterproof plate 10 below this upper waterproof plate 20, before this installation work, the locking portion 32 and the connecting waterproof material 40 are attached to the lower waterproof plate 10 (see Figs. 2 and 3).

[0042] The locking portion 32 is fitted and fixed to the upstream corner portion at the upper end of the main body plate 11 (see Figs. 2 and 3). Also, the connecting waterproof material 40 is attached to the downstream side surface of the main body plate 11 via the receiving member 41. Note that the attachment work of the locking portion 32 can also be performed after attaching the lower waterproof plate 10 to both support columns 51, 51.

[0043] Next, attach the lower water stop plate 10 to the columns 51 on both sides. In this operation, engage the hanging portions 14 on both sides of the lower water stop plate 10 with the engaged portions 52 on the column 51 side respectively to fix the lower water stop plate 10 substantially vertically.

[0044] Next, stack the upper water stop plate 20 on the lower water stop plate 10. By this stacking operation, the engaged portion 31 fits into the engaging portion 32 (see Fig. 7), and the connecting watertight material 40 is pressed against the lower vertical watertight material 13b (specifically, the vertical watertight portion 13b1) and the upper vertical watertight material 23b (specifically, the connecting watertight portion 23b2) (see Fig. 8).

[0045] Then, the stacked upper water stop plate 20 is locked to the left and right columns 51, 51 by a well-known dedicated locking tool (not shown).

[0046] <Function and Effect> Therefore, according to the water stop device 1 with the above configuration and its installation method, when the water level rises, if the upper water stop plate 20, which is prone to deflection, tries to deflect in a substantially arcuate cross-section to the downstream side from the lower water stop plate 10, the engaged portion 31 on the upper water stop plate 20 side is locked to the engaging portion 32 on the lower water stop plate 10 side, suppressing the deflection of the upper water stop plate 20. As a result, a gap is prevented from occurring between the upper water stop plate 20 and the lower water stop plate 10, and water leakage through this gap can be prevented.

[0047] Also, in the state where the upper water stop plate 20 is stacked on the lower water stop plate 10, a gap due to a difference in the lateral position between the upper vertical watertight material 23b and the lower vertical watertight material 13b can be prevented by the connecting watertight material 40 that contacts these two watertight materials.

[0048] <Modification Example> According to the above embodiment, the engaged portion 31 and the engaging portion 32 are applied to the water stop device 1 in which the upper water stop plate 20 is more prone to deflection than the lower water stop plate 20 due to the difference in thickness. However, the engaged portion 31 and the engaging portion 32 can also be applied to a water stop device in which the upper water stop plate is more prone to deflection than the lower water stop plate due to a configuration other than thickness, such as a water stop device in which the deflection strength of the upper water stop plate is smaller than that of the lower water stop plate due to the difference in material.

[0049] According to the above embodiment, the locked portion 31 is formed in a concave shape and the locking portion 32 is formed in a convex shape. However, as another example, it is also possible to reverse this concave-convex relationship. That is, the locked portion 31 may be formed in a convex shape and the locking portion 32 may be formed in a concave shape.

[0050] According to the above embodiment, the locked portion 31 is formed in a concave groove shape extending in the lateral width direction, and the locking portion 32 is formed in a convex plate shape extending in the lateral width direction. However, as another example, the locked portion 31 may be a single or a plurality of holes, and the locking portion 32 may be a single or a plurality of shafts that respectively fit into the holes. In this case, it is preferable that the locked portion 31 and the locking portion 32 are provided closer to the center in the lateral width direction of the lower water stop plate 10 and the upper water stop plate 20.

[0051] According to the above embodiment, as a particularly preferable example, the locked portion 31 and the locking portion 32 are configured to lock within the thickness of the upper water stop plate 20. However, as another example, it is also possible to configure the locked portion 31 and the locking portion 32 to lock outside the thickness of the upper water stop plate 20.

[0052] According to the above embodiment, as a particularly preferable example, the connecting watertight material 40 is provided on the lower water stop plate 10. However, as another example, it is also possible to provide the connecting watertight material 40 on the upper water stop plate 20, or to provide the connecting watertight material 40 on the support column 51, etc.

[0053] According to the above embodiment, the upper vertical watertight material 23b is arranged inside the lower vertical watertight material 13b in the lateral width direction. However, as another example, it is also possible to arrange the upper vertical watertight material 23b outside the lower vertical watertight material 13b in the lateral width direction, and configure the connecting watertight material 40 to contact these vertical watertight materials 13b, 23b.

[0054] Also, according to the above embodiment, the support columns 51, 51 are provided on both end sides of the lower water stop plate 10 and the upper water stop plate 20. However, as another example, it is also possible to provide the support column 51 only on one end side of the lower water stop plate 10 and the upper water stop plate 20, and the other end side is supported watertightly by a configuration not shown.

[0055] In addition, the present invention is not limited to the specific configurations described above, and can be appropriately changed without departing from the gist of the present invention.

[0056] <Summary> As described above, the following inventions are disclosed in the above embodiments. (1) A water stop device that includes a lower water stop plate and an upper water stop plate stacked above the lower water stop plate and more flexible than the lower water stop plate, and that blocks the water flow in a direction intersecting these water stop plates. When the upper water stop plate attempts to deflect downstream, a locked portion provided on the upper water stop plate is locked to a locking portion provided on the lower water stop plate (see FIGS. 1 to 9). (2) The water stop device according to (1), characterized in that the upper water stop plate has a smaller section modulus than the lower water stop plate. (3) The water stop device according to (1) or (2), characterized in that the locked portion locks to the locking portion within the thickness of the upper water stop plate (see FIG. 7). (4) The water stop device according to any one of (1) to (3), characterized in that the locking portion and the locked portion are provided at least at the central portions in the width direction of the upper water stop plate and the lower water stop plate (see FIGS. 2 and 4). (5) The water stop device according to any one of (1) to (4), characterized in that the locking portion and the locked portion are provided across the width direction of the upper water stop plate and the lower water stop plate (see FIGS. 6 and 7). (6) The water stop device according to any one of (1) to (5), characterized in that one of the locking portion and the locked portion is formed in a convex shape and the other is formed in a concave shape. (7) The step of providing the locking portion on the lower water stop plate, and after this step, the step of stacking the upper water stop plate above the lower water stop plate so that the locking portion and the locked portion are engaged with each other, which is characterized by including the installation method of the water stop device according to any one of (1) to (6) (see FIGS. 6 and 7).

Explanation of Signs

[0057] 1: Water stop device 10: Lower water stop plate 11: Body plate 13: Lower watertight member 13a: Lateral watertight material 13b: Vertical watertight material 13b1: Vertical watertight portion 13b2: Connection watertight portion 20: Upper water stop plate 21: Body plate 23: Upper watertight member 23a: Lateral watertight material 23b: Vertical watertight material 23b1: Vertical watertight portion 23b2: Connection watertight portion 31: Locked portion 40: Connecting watertight material 41; Receiving member 51: Support column

Claims

1. In a water stop device that uses a lower water stop plate and an upper water stop plate stacked above the lower water stop plate and more flexible than the lower water stop plate to block the water flow in a direction intersecting these water stop plates, when the upper water stop plate attempts to bend downstream, the engaged portion provided on the upper water stop plate is engaged with the engaging portion provided on the lower water stop plate. The water stop device is characterized by this.

2. The water stop device according to Claim 1, wherein the upper water stop plate has a smaller section modulus than the lower water stop plate.

3. The water stop device according to Claim 1, wherein the engaged portion engages with the engaging portion within the thickness of the upper water stop plate.

4. The water stop device according to Claim 1, wherein the engaging portion and the engaged portion are provided at least at the central portion in the lateral width direction of the upper water stop plate and the lower water stop plate.

5. The water stop device according to Claim 1, wherein the engaging portion and the engaged portion are provided across the lateral width direction of the upper water stop plate and the lower water stop plate.

6. The water stop device according to Claim 1, wherein one of the engaging portion and the engaged portion is formed in a convex shape and the other is formed in a concave shape.

7. A step of providing the engaging portion on the lower water stop plate; After this step, a method for installing the water stop device according to any one of Claims 1 to 6, characterized by including a step of stacking the upper water stop plate above the lower water stop plate so that the engaging portion and the engaged portion engage with each other.

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