Water shutoff device

Abstract

To raise a water stop height according to the rise in water level.SOLUTION: A water stop device includes a main water stop plate 11 provided so as to cross the flow of water, and an auxiliary water stop plate 12 provided so as to be movable upward with respect to the main water stop plate 11. The auxiliary water stop plate 12 moves upward due to buoyancy to increase a water stop height of the main water stop plate 11.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a water stop device that prevents water from entering openings such as buildings and subways during high water levels or the like.

Background Art

[0002] When water accumulated due to typhoons or heavy rainstorms enters openings such as buildings and subways, it may cause significant damage. Therefore, in preparation for such a situation, grooved columns are erected facing each other on both sides of the openings of buildings and subways in advance, and a water stop plate is stored near these columns. When water accumulation occurs, the water stop plate is inserted into the groove of the column to close the opening and prevent water from entering. This has been conventionally known (see Patent Document 1). By the way, according to such a conventional technique, there is a possibility that the water level becomes higher than the height at which the water can be stopped by the water stop plate, and the increased water may overflow over the water stop plate. Therefore, it is conceivable to set the water stop plate higher in advance in anticipation of such water accumulation.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the water stop plate is set higher in advance, for example, there may be problems such as evacuees not being able to cross over the water stop plate.

Means for Solving the Problems

[0005] In view of such problems, one aspect of the present invention has the following configuration. The system comprises a main water-stopping plate positioned to intersect the water flow, and an auxiliary water-stopping plate positioned to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward due to buoyancy to increase the water-stopping height of the main water-stopping plate. The auxiliary water-stopping plate is provided to slide upward due to buoyancy. A water-stopping device characterized by the following features. Furthermore, one aspect of the present invention comprises the following configuration. A water-stopping device comprising a main water-stopping plate provided to intersect the flow of water, and an auxiliary water-stopping plate provided to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward by buoyancy to increase the water-stopping height of the main water-stopping plate, the main water-stopping plate is provided with a through-shaped notch that is open at the top, and the auxiliary water-stopping plate moves upward from a lower position with the notch open to an upper position with the notch closed. Furthermore, one aspect of the present invention comprises the following configuration. A water-stopping device comprising a main water-stopping plate provided so as to intersect the flow of water, and an auxiliary water-stopping plate provided so as to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward by buoyancy to increase the water-stopping height of the main water-stopping plate, the auxiliary water-stopping plate is provided along the entire length in the lateral direction of the main water-stopping plate, and moves upward from a lower position below the upper end of the main water-stopping plate to an upper position that protrudes above the upper end of the main water-stopping plate. Furthermore, one aspect of the present invention comprises the following configuration. A water-stopping device comprising a main water-stopping plate provided so as to intersect the flow of water, and an auxiliary water-stopping plate provided so as to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward by buoyancy to increase the water-stopping height of the main water-stopping plate, and the auxiliary water-stopping plate is provided on both the front and back sides of the main water-stopping plate. Furthermore, one aspect of the present invention comprises the following configuration. A water-stopping device comprising a main water-stopping plate provided to intersect the flow of water, and an auxiliary water-stopping plate provided to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward by buoyancy to increase the water-stopping height by the main water-stopping plate, and a holding mechanism is provided to hold the auxiliary water-stopping plate in a predetermined position so that it cannot move up or down. Furthermore, one aspect of the present invention comprises the following configuration. A water-stopping device comprising a main water-stopping plate provided so as to intersect the flow of water, and an auxiliary water-stopping plate provided so as to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward due to buoyancy to increase the water-stopping height by the main water-stopping plate, and a biasing mechanism is provided to assist the upward movement of the auxiliary water-stopping plate due to buoyancy and bias the auxiliary water-stopping plate upward. Furthermore, one aspect of the present invention comprises the following configuration. A water-stopping device comprising a main water-stopping plate installed so as to intersect the flow of water, and an auxiliary water-stopping plate installed so as to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward due to buoyancy to increase the water-stopping height by the main water-stopping plate, and an assist mechanism is provided to assist the initial movement of the auxiliary water-stopping plate upward. [Effects of the Invention]

[0006] As described above, the present invention is configured such that the water level can be increased in accordance with the rise in water level. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing an example of a water-stopping device according to the present invention, before the auxiliary water-stopping plate moves upward. [Figure 2] This is a perspective view showing the state of the water-stopping device after the auxiliary water-stopping plate has moved upward. [Figure 3] This is a perspective view of the main parts of the water-stopping device, showing the watertight material removed. [Figure 4] This is a longitudinal cross-sectional view showing the auxiliary water-stopping plate in the water-stopping device in the process of moving upward due to buoyancy. [Figure 5] This is a perspective view showing another example of the water-stopping device according to the present invention, before the auxiliary water-stopping plate moves upward. [Figure 6]It is a perspective view showing the state after the auxiliary water stop plate has moved upward in the water stop device. [Figure 7] Regarding another example of the water stop device according to the present invention, it is a perspective view showing the state before the auxiliary water stop plate moves upward. [Figure 8] It is a perspective view showing the state after the auxiliary water stop plate has moved upward in the water stop device. [Figure 9] Regarding another example of the water stop device according to the present invention, it is a longitudinal sectional view showing the state after one of the auxiliary water stop plates has moved upward. [Figure 10] Regarding another example of the water stop device according to the present invention, it is a longitudinal sectional view showing the state in which the auxiliary water stop plate is moving upward due to buoyancy. [Figure 11] Regarding another example of the water stop device according to the present invention, it is a longitudinal sectional view showing the state in which the auxiliary water stop plate is moving upward due to buoyancy. [[ID=*16]] [Figure 12] It is a longitudinal sectional view showing another example of the water stop device according to the present invention. (a) shows the state where the auxiliary water stop plate is in the initial position, and (b) shows the state where the initial movement of the upward movement of the auxiliary water stop plate is assisted by an assist mechanism. [Figure 13] It is a longitudinal sectional view showing another example of the water stop device according to the present invention. (a) shows the state where the auxiliary water stop plate is in the initial position, and (b) shows the state where the initial movement of the upward movement of the auxiliary water stop plate is assisted by an assist mechanism.

Embodiments for Carrying Out the Invention

[0008] Next, embodiments according to the present invention will be described in detail based on the drawings.

[0009] <The First Embodiment><From Next, specific embodiments having the above characteristics will be described in detail based on the drawings. The water stop device 1 includes a water stop plate 10 provided so as to intersect the water flow, and left and right water stop body support parts 20, 20 that support the water stop plate 10 on both sides, and is installed on a fixed surface such as a floor surface so as to block an opening of a building or the like. In the illustrated example, the one side and the other side are the outdoor side and the indoor side, respectively. Alternatively, one side may be the indoor side and the other side the outdoor side. Furthermore, in the illustrated example, the outdoor side is the upstream side of the water flow and the indoor side is the downstream side. However, in another example, the water-stopping plate 10 can be installed in the opposite direction, so that the indoor side is the upstream side and the outdoor side is the downstream side.

[0010] The water-stopping plate 10 comprises a main water-stopping plate 11 extending between the left and right water-stopping body support parts 20, 20, and an auxiliary water-stopping plate 12 that is opposite the main water-stopping plate 11 and moves upward due to buoyancy (rotates upward in the illustrated example) to increase the water-stopping height. Furthermore, a holding mechanism 35 is provided between the main water-stopping plate 11 and the auxiliary water-stopping plate 12, as needed, to hold the auxiliary water-stopping plate 12 in a predetermined position so that it cannot move up or down.

[0011] The main water-stopping plate 11 is a horizontally elongated rectangular plate-shaped member, and is detachably attached to the water-stopping support parts 20, 20 on both sides from the outdoor side (upstream side). The main water-stopping plate 11 has a notch 11a on its upper side that is concave in front view and penetrates in the thickness direction, and a handle portion 11b at its upper end. This main water-stopping plate 11 is constructed from a hard material such as metal, and is either solid or hollow with a drainage structure.

[0012] The notch 11a has a concave shape when viewed from the front, with an opening at the top, and penetrates the main water-stopping plate 11 in the thickness direction. A projection 11a1 is provided on the inner surface of the notch 11a, near the indoor end, so as to protrude toward the space inside the notch 11a.

[0013] Watertight materials 31, 32, and 33 are provided on the inner surface of this notch 11a so as to be compressed between it and the auxiliary watertight plate 12 located in the upper position (watertight position). These watertight materials 31, 32, and 33 are each formed from an elastic material such as rubber or elastomer resin.

[0014] The watertight material 31 is formed in a plate shape that overlaps the left portion of the inner surface of the notch 11a (see Figure 3). At the outdoor end of the watertight material 31, a guide inclined surface 31a is formed in the vertical direction, extending from the outdoor side towards the indoor side and gradually sloping inward towards the notch 11a, in order to guide the auxiliary water-stopping plate 12 into the notch 11a. This guide inclined surface 31a ensures that the auxiliary water-stopping plate 12 fits smoothly into the notch 11a. Furthermore, a projection 31b is formed vertically at the indoor end of the watertight material 31 so as to abut against the projection 11a1 of the notch 11a. When the auxiliary watertight plate 12 is fitted into the notch 11a, this projection 31b is sandwiched and compressed between the auxiliary watertight plate 12 and the projection 11a1, sealing the gap between them in a watertight manner.

[0015] The watertight material 32 is formed symmetrically with the watertight material 31 and has a guide inclined surface 32a and a protrusion 32b, etc.

[0016] The watertight material 33 is formed in the shape of a rectangular flat plate that contacts the inner surface on the bottom side of the notch 11a. In addition, as an alternative, it is also possible to make the watertight material 33 have the same cross-sectional shape as the watertight materials 31 and 32. When the auxiliary water-stopping plate 12 is in the upper position (see Figure 2), the watertight material 33 is sandwiched and compressed between the lower end surface of the auxiliary water-stopping plate 12 and the inner bottom surface of the notch 11a, thereby sealing the gap between them in a watertight manner.

[0017] The auxiliary water-stopping plate 12 is formed in the shape of a rectangular plate from, for example, a hollow metal material or foam material, and the auxiliary water-stopping plate 12 itself has buoyancy that allows it to move upward in water. Other examples of materials for the auxiliary water-stopping plate 12 include wood, buoyant synthetic resin materials, and other materials with a low specific gravity. The auxiliary water-stopping plate 12 only needs to have buoyancy as a whole, and can be configured in ways such as being made of a material that floats easily on water, or being made of a material that does not have buoyancy and a material that does have buoyancy. Furthermore, a preferred embodiment of the auxiliary water-stopping plate 12 may be one that has a portion that is easily susceptible to buoyancy in terms of its shape (see, for example, Figure 10).

[0018] This auxiliary water-stopping plate 12 is rotatably supported by the main water-stopping plate 11 via a hinge 13. In the initial state when there is no water around, it is in the lower position with the notch 11a open (see Figure 1). When there is water around, it moves upward due to buoyancy to the upper position with the notch 11a watertightly closed (see Figure 2).

[0019] More specifically, the auxiliary water-stopping plate 12 is pivotally supported at its opposite end by one or more hinges 13 on the main water-stopping plate 11, so that one end rotates upward due to buoyancy. In the illustrated example, the hinges 13 are mounted between the main water-stopping plate 11 and the outdoor side surface of the auxiliary water-stopping plate 12, with their axis of rotation aligned with the bottom edge of the notch 11a.

[0020] The holding mechanism 35 can be any mechanism that holds the auxiliary water-stopping plate 12 in a predetermined position in the vertical movement path so that it cannot move vertically, or that releases this holding state by a predetermined operation. The holding mechanism 35 in the illustrated example comprises a magnet 35a fixed to the main water-stopping plate 11 and a magnetic member 35b fixed to the auxiliary water-stopping plate 12 so as to be attracted to the magnet 35a. When the auxiliary water-stopping plate 12 is fitted into the notch 11a, the magnet 35a attracts the magnetic member 35b by magnetic force, and the attraction is released when the auxiliary water-stopping plate 12 is moved in the opposite direction by manual operation or the like. The predetermined operation to release the holding state can be a manual release operation as described above, but another preferred example is an automatic release using rising water.

[0021] Next, the characteristic effects of the water-stopping device 1 with the above configuration will be explained in detail. In the initial state where there is no water on the outdoor side, as shown in Figure 1, the auxiliary water-stopping plate 12 is in the lower position and the notch 11a is open. Therefore, in this initial state, the water-stopping height H1 by the water-stopping plate 10 is the maximum height of the main water-stopping plate 11 minus the height of the notch 11a. The notch 11a can be used for a person to step over or for other purposes.

[0022] When the water level rises on the outdoor side, the auxiliary water-stopping plate 12 floats as the water rises and attempts to overflow the main water-stopping plate 11 at the notch 11a. As a result, the auxiliary water-stopping plate 12 rotates upward around the hinge 13 as its pivot point, and gradually fits into the space between the watertight materials 31, 31, 32 from bottom to top (see Figure 4). During this rotation, the lower side of the auxiliary water-stopping plate 12 partially fits into the space between the watertight materials 31, 31, 32, thereby preventing water from passing through.

[0023] The auxiliary water-stopping plate 12 then assumes an upper position (closed state shown in Figure 2) that watertightly closes the entire notch 11a. In particular, when a holding mechanism 35 is provided (see Figure 1), the auxiliary water-stopping plate 12 can be smoothly brought into the closed state by the magnetic force of the holding mechanism 35, and moreover, this closed state can be stably maintained. In the upper position (closed state), the water-stopping height H2 that can be stopped by the entire water-stopping plate 10 is approximately the same as the maximum height of the main water-stopping plate 11 (see Figure 2).

[0024] Thus, with the water-stopping device 1, the water-stopping height can be gradually increased as the water level rises.

[0025] <Second Embodiment> Next, other embodiments of the present invention will be described. Note that the embodiments described below are modified versions of the water-stopping device 1 described above; therefore, the modifications will be described in detail, and redundant detailed explanations will be omitted.

[0026] The water-stopping device 2 shown in Figures 5 and 6 is the same as the water-stopping device 1 described above, but with the main water-stopping plate 11, auxiliary water-stopping plate 12, hinge 13, and watertight materials 31, 32, and 33 replaced by the main water-stopping plate 11', auxiliary water-stopping plate 14, left and right rails 15, 15, and watertight material 34, respectively.

[0027] As shown in the illustrated example, the main water-stopping plate 11' is obtained by omitting the protruding portion 11a1 from the main water-stopping plate 11. It is also possible to use the main water-stopping plate 11 as is instead of this main water-stopping plate 11'.

[0028] The auxiliary water-stopping plate 14, like the auxiliary water-stopping plate 12 described above, is formed in the shape of a rectangular plate from a hollow metal material or foam material and has buoyancy. Other examples of materials for the auxiliary water-stopping plate 14 include wood, buoyant synthetic resin materials, and other materials with a low specific gravity. The auxiliary water-stopping plate 14 only needs to have buoyancy as a whole, and can be configured in a way that the whole is made of a material that floats easily on water, or in a way that it is made of a material that does not have buoyancy and a material that does have buoyancy. Furthermore, a preferred embodiment of the auxiliary water-stopping plate 14 may be one that has a portion that is easily susceptible to buoyancy in terms of its shape (see, for example, Figure 11).

[0029] This auxiliary water-stopping plate 14 is sized to overlap the watertight material 34, so as to cover the notch 11a from the outside.

[0030] The left and right rails 15, 15 are fixed to the outdoor side of the main water-stopping plate 11 with the notches 11a in between them. Each rail 15 guides the auxiliary water-stopping plate 14 vertically on both the left and right sides, and, as shown in the illustrated example, has a roughly L-shaped cross-section that loosely fits into the left or right end of the auxiliary water-stopping plate 14, which is continuous in the vertical direction. Furthermore, each rail 15 is provided with a locking mechanism (not shown) that holds the auxiliary water-stopping plate 14 in a predetermined lower position (the lower limit position illustrated in Figure 5).

[0031] The watertight material 34 is formed from an elastic material such as rubber or elastomer resin into an appropriate shape, such as a flat plate. In the illustrated example, this watertight material 34 is adhered and fixed to the outdoor side surface of the main watertight plate 11' in a concave shape in plan view along the notch 11a. As an alternative, a watertight material similar to the one described above may be provided on the indoor side of the auxiliary watertight plate 14.

[0032] Therefore, with the water-stopping device 2 configured as described above, in the initial state where there is no water on the outside, the auxiliary water-stopping plate 12 is in the lower position, the notch 11a is open, and the water-stopping height H1 by the water-stopping plate 10 is the dimension obtained by subtracting the height of the notch 11a from the maximum height of the main water-stopping plate 11'. In this initial state, people can pass over the notch 11a.

[0033] If the water level rises on the outdoor side, the auxiliary water-stopping plate 14 slides upward due to buoyancy, reaching the upper position where the notch 11a is watertightly closed (see Figure 6). At this upper position, the water-stopping height H2 provided by the water-stopping plate 10 is approximately the same as the maximum height of the main water-stopping plate 11'.

[0034] Thus, the water-stopping device 2 can automatically increase the water-stopping height in accordance with the rising water level. Furthermore, with this water-stopping device 2, when the water level drops, the auxiliary water-stopping plate 12 lowers due to its own weight, thus automatically lowering the water-stopping height.

[0035] <Third Embodiment> The water-stopping device 3 shown in Figures 7 and 8 is the same as the water-stopping device 1, but with the water-stopping plate 10 replaced by a water-stopping plate 40.

[0036] The water-stopping plate 40 comprises a main water-stopping plate 41 that is installed so as to intersect the flow of water, and an auxiliary water-stopping plate 42 that moves upward relative to the main water-stopping plate 41 by buoyancy (rotates upward in the illustrated example) to increase the water-stopping height.

[0037] The main water-stopping plate 41 is a horizontally elongated rectangular plate-shaped member, and is detachably attached from the outdoor side to the lower half of the water-stopping support parts 20, 20 on both sides. The upper end of the main water-stopping plate 41 is a nearly horizontal surface without any irregularities. A watertight material 41a is continuously provided on this surface over approximately its entire length in the lateral direction. When the auxiliary water-stopping plate 42 rotates upward, this watertight material 41a is sandwiched between the auxiliary water-stopping plate 42 and the main water-stopping plate 41 to maintain watertightness.

[0038] The auxiliary water-stopping plate 42 is formed from, for example, a hollow metal material or foam material, into a rectangular plate shape having a width dimension approximately the same as the lateral length of the main water-stopping plate 41, and has buoyancy. Other examples of materials for the auxiliary water-stopping plate 42 include wood, buoyant synthetic resin materials, and other materials with a low specific gravity. The auxiliary water-stopping plate 42 only needs to have buoyancy as a whole, and can be configured in a way that the whole is made of a material that floats easily on water, or in a way that it is made of a material that does not have buoyancy and a material that does have buoyancy. Furthermore, a preferred embodiment of the auxiliary water-stopping plate 42 may be one that has a portion that is easily susceptible to buoyancy in terms of its shape.

[0039] The auxiliary water-stopping plate 42 is supported by the main water-stopping plate 41 via a plurality of hinges 13 so as to rotate upward from a lower position (see Figure 7) below the upper end of the main water-stopping plate 41 to an upper position (see Figure 8) that protrudes above the upper end of the main water-stopping plate 41.

[0040] Therefore, with the water-stopping device 3 configured as described above, in the initial state where there is no water on the outside, the auxiliary water-stopping plate 42 is located below the upper end of the main water-stopping plate 41, and the water-stopping height H1 is the height from the lower end to the upper end of the main water-stopping plate 11 (see Figure 7).

[0041] Furthermore, when the water level rises on the outdoor side, the auxiliary water-stopping plate 42 rotates upward due to buoyancy, closing the space above the main water-stopping plate 41. Therefore, the water-stopping height H2 is the height from the lower end of the main water-stopping plate 11 to the upper end of the auxiliary water-stopping plate 42 located above it (see Figure 8).

[0042] In other words, the water-stopping device 3 with the above configuration can also automatically increase the water-stopping height in accordance with the rise in water level.

[0043] Furthermore, as another example of the water-stopping device 3, the auxiliary water-stopping plate 42 can be installed to slide vertically, similar to the water-stopping device 2 (see Figures 5 and 6). In this case, the water-stopping height can be automatically changed in accordance with the rise and fall of the water level.

[0044] <Fourth Embodiment> Furthermore, the water-stopping device 4 shown in Figure 9 is the same as the water-stopping device 2 described above, but with an auxiliary water-stopping plate 14, a rail 15, a watertight material 34, etc., provided on both the front and back sides of the main water-stopping plate 11'. The main water-stopping plate 11' in this water-stopping device 4 is configured to be attachable to the water-stopping support portion 20 on either its front or back side.

[0045] Therefore, with the water-stopping device 4 configured as described above, when attaching the water-stopping plate 10 to the water-stopping support part 20, the worker does not need to be aware of the attachment surface to the water-stopping support part 20, resulting in good workability. Furthermore, if water levels rise on the outdoor or indoor side, the auxiliary water-stopping plate 14 on the upstream side of the water level rise can be automatically raised or lowered.

[0046] <Fifth Embodiment> The water-stopping device 5 shown in Figure 10 is the same as the water-stopping device 1 described above, but with the addition of a floating portion 12a to the auxiliary water-stopping plate 12. The floating portion 12a protrudes from the surface of the auxiliary water-stopping plate 12 at its tip, increasing the surface area and volume of the portion in contact with water, thereby increasing the buoyancy it receives in the initial stage of the auxiliary water-stopping plate 12's upward rotation. The floating portion 12a is preferably formed from a material with greater buoyancy than the auxiliary water stopper plate 12, but it can also be integrally molded from the same material as the auxiliary water stopper plate 12. The shape of the floating portion 12a, as shown in one example in Figure 10, is a horizontal rectangular prism extending across the width of the auxiliary water-stopping plate 12. This shape can be changed to the floating portion 14a (see Figure 11), which will be described later, or to other shapes.

[0047] Therefore, according to the water-stopping device 5 shown in Figure 10, the floating portion 12a can be rotated upward more smoothly by buoyancy, allowing the auxiliary water-stopping plate 12 to rotate upward more smoothly.

[0048] <Sixth Embodiment> The water-stopping device 6 shown in Figure 11 is the same as the water-stopping device 2 described above, but with the addition of a floating portion 14a to the auxiliary water-stopping plate 14. The floating portion 14a protrudes from the surface of the auxiliary water-stopping plate 14 at its lower end, increasing the buoyancy received by the auxiliary water-stopping plate 14, thereby increasing the surface area and volume of the portion in contact with water. The floating portion 14a is preferably formed from a material with greater buoyancy than the auxiliary water stopper plate 14, but it can also be integrally molded from the same material as the auxiliary water stopper plate 14. The shape of the floating portion 14a, as shown in one example in Figure 11, is a horizontally oriented triangular prism extending in the width direction of the auxiliary water-stopping plate 14. This shape can be the floating portion 12a (see Figure 10) described above, or other shapes.

[0049] Therefore, according to the water-stopping device 6 shown in Figure 11, the floating portion 14a can be slid more smoothly upward by buoyancy, allowing the auxiliary water-stopping plate 14 to slide upward more smoothly.

[0050] <Seventh Embodiment> The water-stopping device 7 shown in Figures 12(a) and 12(b) is a water-stopping device 1 equipped with an assist mechanism 50 that assists the initial upward movement of the auxiliary water-stopping plate 12. The assist mechanism 50 is constructed with a roughly V-shaped cross-section, consisting of a plate-shaped piece 51 extending upward toward the space between the main water-stopping plate 11 and the auxiliary water-stopping plate 12, and another plate-shaped piece 52 extending longer than the piece 51 diagonally upward from the lower end of the piece 51, with the boundary between the piece 51 and the other piece 52 pivotally supported so as to be rotatable with respect to the water-stopping plate 10.

[0051] According to this water-stopping device 7, when there is no water, one piece 51 is positioned between the lower end of the auxiliary water-stopping plate 12 and the main water-stopping plate 11, and the other piece 52 is inclined downward and diagonally upstream. When water flows toward the water-stopping plate 10 due to rising water levels, the other piece 52 is pushed by this water flow and rotates downstream, while the other piece 51 rotates upstream. Therefore, the auxiliary water-stopping plate 12 is pushed by one piece 51 and rotates slightly upward, tilting its lower end upstream. As a result, when the water level rises further and reaches the lower end of the auxiliary water-stopping plate 12, the auxiliary water-stopping plate 12 rotates smoothly upward due to buoyancy.

[0052] Therefore, the water-stopping device 7 shown in Figure 12 allows for smooth initial movement of the auxiliary water-stopping plate 12.

[0053] <Eighth Embodiment> The water-stopping device 8 shown in Figures 13(a) and 13(b) is a water-stopping device 1 that is equipped with an assist mechanism 60 that assists the initial upward movement of the auxiliary water-stopping plate 12. The assist mechanism 60 includes a vertically grooved guide portion 61 formed in the main water-stopping plate 11, and a floating member 62 that can rise along the guide portion 61. The floating member 62 is appropriately adjusted in terms of material, surface area, volume, shape, etc., so that it has greater buoyancy than the auxiliary water-stopping plate 12. The upper end of the floating member 62 is formed in a roughly wedge shape in its vertical cross-section so that it fits between the lower end of the auxiliary water-stopping plate 12 and the main water-stopping plate 11.

[0054] According to this water-stopping device 8, when there is no water, the floating member 62 is located below the auxiliary water-stopping plate 12 and on the floor surface or the like. As the surrounding water level rises, the floating member 62 floats on this water, and the wedge-shaped portion at the upper end of the floating member 62 fits between the auxiliary water-stopping plate 12 and the main water-stopping plate 11. The inclined surface of the wedge-shaped portion pushes the auxiliary water-stopping plate 12 upstream. Therefore, the auxiliary water-stopping plate 12 rotates slightly upward, tilting its lower end upstream. Then, when the water level rises further and reaches the lower end of the auxiliary water-stopping plate 12, the auxiliary water-stopping plate 12 rotates smoothly upward due to buoyancy.

[0055] Therefore, the water-stopping device 8 shown in Figure 13 can also make the initial movement of the auxiliary water-stopping plate 12 smoother.

[0056] <Other variations> In the above embodiment, as an example, the holding mechanism 35 (see Figure 1) holds the auxiliary water-stopping plate 12 in the upper position (water-stopping position). However, other examples of the holding mechanism include the holding of the auxiliary water-stopping plate in the lower position, the holding of the auxiliary water-stopping plate in both the upper and lower positions, and the holding of the auxiliary water-stopping plate at an intermediate position in the vertical movement direction. Furthermore, by holding the auxiliary water stopper in place in this manner, it is possible to prevent malfunctions caused by slight movement or rattling of the auxiliary water stopper during use or transportation.

[0057] Furthermore, in the above embodiment, the holding mechanism 35 is composed of a magnet 35a and a magnetic member 35b, but as another example of this holding mechanism, the auxiliary water-stopping plate 12 itself may be formed from a magnetic material and magnetically attached to the magnet 35a. Furthermore, other examples of the holding mechanism include engagement / disengagement mechanisms such as roller catchers, as well as other engagement or fitting structures.

[0058] Furthermore, in the above embodiment, the auxiliary water-stopping plate is moved upward by rotation or sliding. However, in other examples, the auxiliary water-stopping plate can also be moved upward by both rotation and sliding. Specifically, it is possible to have the auxiliary water-stopping plate slide upward due to buoyancy and then rotate to reach the upper position (water-stopping position), or to have the auxiliary water-stopping plate rotate upward due to buoyancy and then slide to reach the upper position, or to have the auxiliary water-stopping plate rotate while sliding upward due to buoyancy to reach the upper position, and so on.

[0059] Furthermore, while the above-described water-stopping devices 1 and 2 provide a single notch 11a in the main water-stopping plate 11, another example would be to provide multiple notches spaced apart in the lateral direction in the main water-stopping plate 11. In this case, multiple notches may be closed together by a single auxiliary water-stopping plate that is elongated in the horizontal direction, or multiple notches may be closed individually by multiple auxiliary water-stopping plates.

[0060] Furthermore, in the above embodiment, a single notch is covered by a single auxiliary water-stopping plate, but in another example, a single notch can be covered by multiple auxiliary water-stopping plates arranged in the width direction.

[0061] Furthermore, in the above-described water-stopping device 4, an auxiliary water-stopping plate 14 that slides upward is provided on both the front and back sides. However, in addition to the illustrated example, it is also possible to provide an auxiliary water-stopping plate 12 that rotates upward on both the front and back sides. In this case, the auxiliary water-stopping plates 12, 12 on the front and back sides should be fitted into one half and the other half in the thickness direction within the notch, respectively.

[0062] Furthermore, when auxiliary water-stopping plates are provided on both the front and back sides of the main water-stopping plate, these auxiliary water-stopping plates may both be of the same type (for example, both being sliding type, or both being rotating type), or they may be of different types (for example, one side being sliding type and the other side being rotating type).

[0063] Furthermore, in the above embodiment, the auxiliary water-stopping plate is designed to move upward automatically due to buoyancy or the like. However, it is also possible to manually move the auxiliary water-stopping plate upward in advance to increase the water-stopping height, without waiting for it to move upward automatically due to buoyancy or the like.

[0064] Furthermore, in the above embodiment, the auxiliary water stop plate was moved upward solely by buoyancy. However, in another preferred embodiment, a biasing mechanism may be provided to bias the auxiliary water stop plate upward in order to assist the upward movement of the auxiliary water stop plate by buoyancy. This biasing mechanism can be implemented, for example, by adding a torsion spring to the hinge 13 of the aforementioned rotating-type water-stopping devices 1, 3, 5, 7, and 8, which biases the auxiliary water-stopping plate upward. In other words, the hinge 13 can be replaced with a spring-loaded hinge or the like. Furthermore, for the slide-type water-stopping devices 2, 4, and 6 described above, the auxiliary water-stopping plates can be biased upward by, for example, compression springs or tension springs. Furthermore, the biasing mechanism can also be configured with springs of a different type than those described above, as well as hydraulic mechanisms, pneumatic mechanisms, electric mechanisms, etc. Furthermore, with the water-stopping device equipped with the biasing mechanism, the auxiliary water-stopping plate can be automatically moved upward in a short time by buoyancy and the biasing force of the biasing mechanism, thereby closing the notch 11a.

[0065] Furthermore, the present invention is not limited to the specific configurations described above, and can be modified as appropriate without altering the essence of the invention.

[0066] <Summary> As described above, the above embodiment discloses the following invention. (1) A water-stopping device (see Figures 1 to 8) comprising a main water-stopping plate installed so as to intersect the flow of water, and an auxiliary water-stopping plate installed so as to be movable upward relative to the main water-stopping plate, wherein the auxiliary water-stopping plate moves upward by buoyancy to increase the water-stopping height of the main water-stopping plate. Here, the water-stopping height refers to the height at which water can be prevented from flowing over the main water-stopping plate and the auxiliary water-stopping plate. This water-stopping height is higher after the auxiliary water-stopping plate moves upward than it was before the auxiliary water-stopping plate moved upward. (2) The water-stopping device according to (1), characterized in that the auxiliary water-stopping plate is provided to rotate upward by buoyancy (see Figures 1 to 4, 7 to 8). (3) The water-stopping device according to (1) or (2) (Figures 5 and 6, 9), characterized in that the auxiliary water-stopping plate is provided to slide upward by buoyancy. (4) The main water-stopping plate is provided with a through-shaped notch that is open at the top, The water-stopping device according to any one of (1) to (3) (see Figures 1 to 6), characterized in that the auxiliary water-stopping plate moves upward from a lower position with the notch open to an upper position with the notch closed. (5) The water-stopping device according to any one of (1) to (3) (see Figures 7 and 8), characterized in that the auxiliary water-stopping plate is provided along the entire length in the width direction of the main water-stopping plate and moves upward from a lower position below the upper end of the main water-stopping plate to an upper position that protrudes above the upper end of the main water-stopping plate. (6) The water-stopping device according to any one of (1) to (5) (see Figure 9), characterized in that the auxiliary water-stopping plate is provided on both the front and back sides of the main water-stopping plate. (7) A water-stopping device according to any one of (1) to (6), characterized in that a holding mechanism is provided for holding the auxiliary water-stopping plate in a predetermined position so that it cannot move up or down. (8) A water-stopping device according to any one of (1) to (7), characterized in that a biasing mechanism is provided to assist the upward movement of the auxiliary water-stopping plate by buoyancy and bias the auxiliary water-stopping plate upward. (9) A water-stopping device according to any one of (1) to (8), characterized in that an assist mechanism is provided to assist the initial upward movement of the auxiliary water-stopping plate. [Explanation of symbols]

[0067] 1,2,3,4,5,6,7,8: Water shutoff devices 10,40: Water stop plate 11,11',41: Main water stop plate 12,14,42: Auxiliary water stop plate 12a,14a: Floating part 13: Hinge 20: Water stop support section 31,32,33,34:Watertight material 50, 60: Assist mechanism H1, H2: Water stop height

Claims

1. A main water-stopping plate is installed so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. The aforementioned auxiliary water-stopping plate is provided to slide upward due to buoyancy, and is characterized by this water-stopping device.

2. A main water-stopping plate provided so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. The main water-stopping plate is provided with a through-shaped notch that is open at the top. The water-stopping device is characterized in that the auxiliary water-stopping plate moves upward from a lower position with the notch open to an upper position with the notch closed.

3. A main water-stopping plate provided so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. The aforementioned auxiliary water-stopping plate is provided along the entire length in the width direction of the main water-stopping plate, and is characterized by moving upward from a lower position below the upper end of the main water-stopping plate to an upper position that protrudes above the upper end of the main water-stopping plate.

4. A main water-stopping plate provided so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. The water-stopping device is characterized in that the auxiliary water-stopping plate is provided on both the front and back sides of the main water-stopping plate.

5. A main water-stopping plate provided so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. A water-stopping device characterized by being provided with a holding mechanism that holds the auxiliary water-stopping plate in a predetermined position so that it cannot move up or down.

6. A main water-stopping plate provided so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. A water-stopping device characterized by being provided with a biasing mechanism that assists the upward movement of the auxiliary water-stopping plate due to buoyancy and biases the auxiliary water-stopping plate upward.

7. A main water-stopping plate provided so as to intersect the flow of water, The system includes an auxiliary water-stopping plate that is movable upward relative to the main water-stopping plate, The auxiliary water-stopping plate moves upward due to buoyancy, thereby increasing the water-stopping height achieved by the main water-stopping plate. A water-stopping device characterized by being provided with an assist mechanism that assists the initial upward movement of the auxiliary water-stopping plate.

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