Water stop device

Abstract

To provide a water stop device with a simple structure.SOLUTION: A water stop device 1 comprises: an underground pit 3 having an internal space opening upward and a bottom wall 3b; a partition wall 3c dividing the internal space of the underground pit 3 horizontally into a storage tank 3e and a housing tank 3f, and forming a connecting passage between its lower end and the bottom wall that makes the storage tank 3e and the housing tank 3f communicate with each other; a water stop plate 7 stored so as to be raised and lowered within the housing tank 3f of the underground pit 3; and a drainage hole 3h that is a through hole provided in the bottom wall 3b for allowing natural drainage of water via a drainage mechanism into an external sewer pipe when embedded. The water stop plate can be raised by buoyancy or pressure, or by buoyancy and pressure receiving from water flowing into the housing tank 3f through the connecting passage 3d or the drainage hole 3h, or through the connecting passage 3d and the drainage hole 3h.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water stop device that is installed, for example, in the passageways of the ground floor or basement floor of a building to prevent water from entering the indoor floor or installed equipment due to heavy rain or the like. [Background technology]

[0002] The water stop device disclosed in Patent Document 1 (hereinafter referred to as the "conventional water stop device") is composed of a water collection pit, a primary pit, a communication hole, and a water stop plate as its main components. The water collection pit is a recess with an opening at the top that is buried vertically from the floor of the passageway, and a cover plate covers the opening to prevent water from directly entering it. The water collection pit is configured to be large enough to completely accommodate the entire water stop plate inserted through the opening, and a sufficient gap is formed between the inner wall of the water collection pit and the water stop plate to allow water to easily enter and raise the water stop plate's buoyancy. The cover plate is attached horizontally to the upper end of the water stop plate and is configured to rise and fall together with the water stop plate.

[0003] Like the collection pit, the primary pit is a recess with an opening above it that is buried beneath the floor of the passageway, and this opening is covered from above with grating (a lattice-like cover). The depth of the primary pit is less than half that of the collection pit, and its top is connected to the top of the collection pit by a connecting hole. When the water level that seeps into the primary pit through the gaps in the grating rises and reaches the connecting hole, the water then flows into the collection pit through the connecting hole, and the flowing water causes the water stop to rise due to its buoyancy. Sliding members consisting of ball casters, door rollers, etc. that slide in contact with the rising and falling water stop are installed at appropriate locations on the inner wall of the collection pit. This is to prevent the water stop from tilting in the gap between it and the inner wall of the collection pit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-345537 Summary of the Invention [Problem to be solved by the invention]

[0005] However, while the sliding member of conventional water stop devices is essential, it complicates the device, leaving room for improvement. Furthermore, Patent Document 1 lists examples of this sliding member, such as ball casters and door rollers, but regardless of the configuration, sliding members are prone to deterioration and breakdown over time due to being submerged in water that enters the water collection pit, or even if they are not submerged, they are difficult to maintain, leaving room for improvement. The problem that the present invention aims to solve is to provide a water stop device with a simple structure that improves on the above points. [Means for solving the problem]

[0006] [1] A waterproof device according to one aspect of the present disclosure includes: an underground pit having an interior space opening upward and a bottom wall; a partition wall that divides the internal space of the underground pit horizontally into a storage tank and a storage tank, and that forms a communication passage between the lower end and the bottom wall to connect the storage tank and the storage tank; A waterstop plate stored in a storage tank of the underground pit so as to be able to rise and fall; a through-hole provided in the bottom wall, which is a drainage hole for allowing natural drainage to an external sewer pipe via a drainage mechanism when buried; and The water stop is configured to be able to rise by buoyancy or pressure, or buoyancy and pressure, received from water that has flowed into the storage tank through the communication passage or the drainage hole, or the communication passage and the drainage hole. This is a water stopping device characterized by the above. [2] A waterproof device according to one aspect of the present disclosure includes: A guide structure is provided to guide the rising of the waterstop at least outside the underground pit and to assist in maintaining the raised state. The waterproof device according to [1] above is characterized in that: [3] A waterproof device according to one aspect of the present disclosure includes: The drain hole is provided in a portion of the bottom wall below the reservoir tank. The waterproof device according to [1] or [2] above, [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a water stop device that has a simple structure but is less likely to deteriorate over time. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic side view showing an example of installation of a water stop device. [Figure 2] FIG. [Figure 3] FIG. 3 is a simplified enlarged view of the underground pit of the water stop device shown in FIG. 2. [Figure 4] FIG. 4 is a vertical cross-sectional view showing the operation of the waterproof device. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described below with reference to the drawings. In this specification, the term "ground" refers to any surface that exists under and supports a person's feet in a space where a person lives, and is not limited to the surface of exposed soil. For example, in a paved road or walkway, the upper surface of the paved portion corresponds to the "ground" in this specification, and in the interior of a building, the floor surface corresponds to the "ground" in this specification.

[0010] Water stop devices are installed, for example, at the entrances to the first floors of ordinary houses in low-lying areas, as well as basement floors, underground passages, subway platforms, etc., to prevent flooding during heavy rainfall. Recently, particularly, there has been a frequent occurrence of what are known as "guerrilla downpours," which are localized, intense downpours that fall in a short period of time. Because it is difficult to accurately predict such downpours using weather forecasts, the installation of water stop devices has become increasingly important. Below, we will explain water stop devices that are installed to prevent damage caused by such torrential rainfall. The same effect is achieved when flooding occurs due to other factors, such as high tides.

[0011] The water stop device 1 illustrated in FIG. 1 is installed in front of a door D of a house H. Most of the water stop device 1 is buried underground. Under normal circumstances when water stopping is not required, the water stop plate 7 is stored underground and does not protrude above the ground G. For simplicity of explanation, water stop structures other than the water stop plate 7 (for example, a fence surrounding the house H) are omitted from FIG. 1, but in reality, water is stopped around the house H by having the water stop plate 7 protrude from the ground G. The domestic drainage pipe 17 shown in FIG. 1 is a drainage pipe that serves as an outlet for sending sewage discharged from the bathroom, toilet, kitchen, etc. of the house H to a sewer pipe 15.

[0012] The explanation will continue with reference to Figure 1. The water stop device 1 is configured to operate when a certain amount of rain or more falls in a short period of time, such as during a torrential downpour. It is preferable that the water stop device 1 does not interfere with the movement of people and vehicles as much as possible when it is not raining or when the amount of rainfall is less than a certain amount. For this reason, as described above, the water stop device 1 is configured so that most of it is buried in the ground G, with the water stop plate 7 protruding from the ground only when necessary. The specific structure of the water stop device 1 will be explained below.

[0013] (External structure of water stop device) The explanation will be given based on Figures 1 to 3. The waterstop device 1 has an underground pit 3 as its main component. The underground pit 3 is formed in various sizes to suit the dimensions of the waterstop plate 7 required at the location where the waterstop device 1 is to be installed. For example, in this embodiment, the length of the long side as viewed from above is set to approximately 50 centimeters, and the length of the short side is set to approximately 25 centimeters. Also, as shown at the right end of Figure 2, the height h of the part buried in the ground is set to approximately 33 centimeters. Figure 3 shows the waterstop plate 7 in a raised state.

[0014] (Underground pit structure) The underground pit 3, including the partition wall 3c described below, can be constructed by bending one or more metal plates such as stainless steel, with due attention paid to strength, so that it can withstand rust even when buried underground or exposed to water. If possible, it can also be constructed from synthetic resin such as reinforced plastic, or a composite of metal and synthetic resin. The underground pit 3 is preferably formed in a box shape, with an internal space surrounded on all four sides by side walls 3a and an open top, and a bottom wall 3b.

[0015] (Partition wall structure) As shown in detail in Figure 3, the internal space of the underground pit 3 is horizontally divided into two by a partition wall 3c extending directly downward from the top. The division of the internal space into two halves forms the storage tank 3e and the storage tank 3f. Both ends of the partition plate 3c are watertightly fixed, for example by welding, to the side wall 3a visible in the back and to the front side wall 3a (not shown in Figure 3). The storage tank 3e is a tank for temporarily storing water, and the length of its short side (the distance between the side wall 3a and the partition wall 3c) as viewed from above is, for example, approximately 10 centimeters. The storage tank 3f is a tank for storing the waterstop 7 so that it can be raised and lowered, and the length of its short side as viewed from above is, for example, approximately 15 centimeters.

[0016] The lower end of partition wall 3c does not reach bottom wall 3b, and a communication passage 3d is formed between them, connecting storage tank 3e and storage tank 3f. Communication passage 3d is a passage for allowing water to flow between storage tank 3e and storage tank 3f. In other words, partition wall 3c is intended to allow water to flow between storage tank 3e and storage tank 3f only through communication passage 3d within underground pit 3. Note that because the lower end of partition wall 3c is parallel to bottom wall 3b, the shape of communication passage 3d is, for example, rectangular when viewed from the front. However, as long as it does not interfere with the water flow intended by the present invention, it may be trapezoidal, arched, or have any other shape.

[0017] As an example, in this embodiment, the size of the communication passage 3d, i.e., the dimension g (see FIG. 3) of the gap between the lower end of the partition wall 3c and the bottom wall 3b, is set to approximately 5 centimeters. This is a suitable example that, in combination with the function and dimensions of the drainage hole 3h described below, allows the flow rate (e.g., the amount of inflow per unit time) of water that has entered the storage tank 3e into the storage tank 3f to be appropriate, and also takes into consideration the function of a stopper that prevents large foreign objects from flowing into the storage tank 3f. It should be noted that, as above, there are no limitations to this dimension setting as long as it does not contradict the purpose of the present invention.

[0018] (Drainage hole structure) As shown in each figure, a drain hole 3h, which is a through-hole, is provided in the bottom wall 3b. The drain hole 3h is preferably provided in a lower portion of the storage tank 3e, but is not limited to this. In this embodiment, the number of drain hole 3h is one (one location), but two or more may be provided if necessary.

[0019] As described below, the drainage hole 3h is a hole for naturally draining rainwater that has entered the storage tank 3e into the sewer pipe 15 via the drainage mechanism 11. It is also a hole for first receiving and storing the majority of water that backs up from the sewer pipe 15 due to heavy rain. From the viewpoint of quickly directing rainwater that has entered the storage tank 3e to the drainage mechanism 11 during periods other than heavy rain, it is preferable that the drainage hole 3h be located below the storage tank 3e (i.e., in a position overlapping the grating 3g in a plan view). Furthermore, from the viewpoint of ease of maintenance of the drainage mechanism 11, it is preferable that the drainage hole 3h be located below the storage tank 3e, since the drain groove 3h can be located below the grating 3g by removing it. The vertical position (height) Lh of the drainage hole 3h is preferably located higher than the vertical position (height) Lg of the sewer pipe 15 (see FIG. 2). This is because it prevents wastewater from flowing into the storage tank 3e during normal times, such as when heavy rain is not occurring.

[0020] (Peripheral components for underground pits) As shown in each figure, the upper opening of the storage tank 3e of the underground pit 3 is covered with a grating 3g. The grating here refers to a lattice-shaped cover made of, for example, metal to allow water to pass through. The upper end surface of the grating 3g is preferably set to be approximately flush with the ground G (see FIG. 1) so as not to obstruct passage. Because the grating 3g is a lattice-shaped cover, rainwater can flow down through its gaps into the storage tank 3e. Meanwhile, the storage tank 3f is configured to prevent water from entering from above to prevent the waterstop 7 from rising unnecessarily. Specifically, a cover member 7a is provided on the top of the waterstop 7, which becomes approximately flush with the ground G when the waterstop 7 is completely retracted into the storage tank 3f to prevent rainwater from entering. The cover member 7a has a U-shaped cross section with a downward opening, as shown in FIG. 3. The upper end surface of the cover member 7a is preferably set to be approximately flush with the ground G (see FIG. 1) so as not to obstruct passage.

[0021] (Drainage mechanism structure) The explanation will be centered on Figure 2. The drainage mechanism 11 of this embodiment includes a drainage pipe 11a, a U-shaped pipe 11b, a manhole member 11c, and a cleaning pipe 11d. The drainage mechanism 11 may include other components and devices, such as private or public sewage manholes, rainwater manholes, and other piping, on the way to the sewer pipe 15 (all of which are not shown). Note that the sewer pipe 15 of this embodiment refers to a pipe for carrying both sewage, such as domestic wastewater, and rainwater, as defined by the Sewerage Act of Japan, but the concept also includes pipes for discharging into rivers, etc.

[0022] The drainage pipe 11a is a pipe that extends straight downward and whose upper end is watertightly connected to the drainage hole 3h of the underground pit 3. The lower end of the drainage pipe 11a is watertightly connected to one end of a U-shaped pipe 11b. The U-shaped pipe 11b serves to retain a certain amount of water in order to prevent odors from flowing from the sewer pipe 15 into the storage tank 3e. The other end of the U-shaped pipe 11b is connected to the sewer pipe 15 via a manhole member 11c.

[0023] The manhole member 11c is a member for merging a pipe, such as the U-shaped pipe 11b, which is intended for the movement of wastewater, with another pipe (the sewer pipe 15 in this embodiment).

[0024] The drainage path of the drainage mechanism 11 is configured so that water drained from the drainage hole 3h enters the U-shaped pipe 11b via the drainage pipe 11a and flows into the sewer pipe 15 via the manhole member 11c. The cleaning pipe 11d is a cleaning pipe with an openable lid, and is a pipe that can be opened from above the ground G to inspect and clean the junction of the manhole member 11c.

[0025] (Waterstop structure) The waterstop 7 can be made of a rust-resistant metal plate such as stainless steel, but in this embodiment, the thin box exterior is made of reinforced plastic. Whatever material is used, the waterstop 7 only needs to be strong enough to achieve its purpose of watertightness. The waterstop 7 is watertight hollow so that it can rise in water due to buoyancy, water pressure, or both buoyancy and pressure. Reinforcing beam members (not shown) may be installed inside vertically, horizontally, or diagonally as needed. It may also be reinforced by enclosing a foam material (not shown) such as expanded polystyrene.

[0026] The waterstop 7 is configured so that its entirety can be completely accommodated within the storage tank 3f of the underground pit 3 and can be raised and lowered, and there is a predetermined gap 3s between its lower end and the bottom wall 3b, large enough to allow water flowing in from the connecting passage 3d to infiltrate into the gap 3s (see Figure 3). The water that infiltrates into the gap 3s acts by its buoyancy or pressure, or by both buoyancy and pressure, to keep the waterstop 7 elevated. Therefore, the gap 3s is large enough to ensure the amount of water that allows the waterstop 7 to begin rising. Such a gap 3s can be achieved, for example, by providing a stopper (not shown) below the storage tank 3f that contacts the bottom of the waterstop 7 to stop it from descending.

[0027] In terms of dimensions, the waterstop 7 can be raised and lowered when stored by ensuring that the gaps between the outer periphery of the waterstop 7 and the sidewall 3a of the storage tank 3f, as well as the gap between the waterstop 7 and the partition wall 3c, are set within a range that allows for lifting and lowering. While watertightness is acceptable, it is possible that small foreign objects may be trapped inside the waterstop 7, so a gap slightly larger than required for watertightness—i.e., a loose or sloppy minimum—is preferable. If this gap is too large, the waterstop 7 is likely to wobble in the thickness direction. Therefore, to effectively prevent this wobble in the thickness direction, it is preferable to use a guide structure such as a guide rail 5 (see Figure 2) that is freestanding on the ground G or attached to the gate (not shown) of the house H. In other words, the guide rail 5 is a component that guides the entire waterstop 7 or the portion protruding from the underground pit 3, facilitating its lifting and lowering and helping to maintain the raised state. The guide rails 5 can be configured, for example, to hold both sides of the waterstop 7 when it is raised and assist in moving it in an appropriate direction. Note that the illustration of the guide rails 5 is omitted in Figure 3 to make the structure of the waterstop 7 easier to understand.

[0028] The guide rail 5 can prevent wobbling of the waterstop 11 in the thickness direction without providing special members or devices such as guide rollers inside the storage tank 3f. Because of its simple structure, maintenance is easy or unnecessary.

[0029] (Function of water stop device 1) The operation of the water stop device 1 of this embodiment will be described with reference to Figure 4. Figure 4(a) shows a state where it is not raining, or if it is raining, the amount of rain is below a certain level and is not a torrential downpour. Figure 4(b) shows a state in the early stages of torrential downpour, where water has entered the storage tank 3e through gaps in the grating 3g and is beginning to overflow. Figure 4(c) shows a state where the torrential downpour has peaked and the waterstop plate 7 is protruding from the ground G to stop the water. Figure 4(d) shows a state where the torrential downpour has ended and the waterstop plate 7 has lowered.

[0030] As shown in Figure 4(a), when it rains, if the amount of rainfall is below a certain level and does not amount to a torrential downpour, the rainwater that seeps in through the gaps in the grating 3g does not accumulate in the storage tank 3e, but is naturally drained into the external sewer pipe 15 via the drainage mechanism 11 (drainage pipe 11a, U-shaped pipe 11b, and box member 11c). At this time, a small amount of water may seep into the gap 3s below the waterstop 7 via the connecting passage 3d, but the amount of water will not be sufficient to raise the waterstop 7.

[0031] As shown in Figure 4(b), when heavy rain begins, rainwater seeping in through gaps in grating 3g is naturally drained via drainage mechanism 11 as described above, but if the amount of rainwater that accumulates exceeds the drainage capacity of drainage mechanism 11, natural drainage begins to stagnate and the water level in storage tank 3e rises. Some of the water that has accumulated in storage tank 3e begins to seep into gap 3s in storage tank 3f via connecting passage 3d.

[0032] As shown in Figure 4(c), when heavy rain reaches its peak, natural drainage becomes impossible, and the water that cannot be treated in the sewer pipe 15 flows back through the drainage mechanism 11 and into the storage tank 3e. On the other hand, if the amount of rain is enough to cause backflow, the area above the grating 3g (above the ground G) becomes flooded and the storage tank 3e also becomes full. At this time, water flows in through the connecting passage 3d, increasing the water level in the storage tank 3f. Here, the waterstop 7 is subjected to buoyancy or pressure (or in some cases, buoyancy and pressure) from the water in the storage tank 3f, and is guided by the guide rail 5 to rise above the ground G.

[0033] As shown in Figure 4(d), when the heavy rain subsides and the water subsides, the function of sewer pipe 15 is restored, so backflow from sewer pipe 15 stops and natural drainage resumes via drainage mechanism 11. With the return of natural drainage, the water in storage tank 3e and storage tank 3f is drained from drainage hole 3h, and along with this, waterstop 7 also descends under its own weight and returns to its original position.

[0034] According to the present embodiment described above, a water stop device with a simple structure that is resistant to deterioration over time can be obtained. Furthermore, since the water stop 7 is raised by using not only rainwater flowing in from above through the grating 3g but also water flowing back from the sewer pipe 15, the water stop 7 can be raised more quickly. Furthermore, since the water stop 7 can be maintained in the raised position until natural drainage resumes, a more reliable water stop effect can be obtained.

[0035] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the numerical conditions shown in the above-described embodiment are merely examples, and the present invention is not limited to these. [Explanation of symbols]

[0036] 1:Water stop device 3: Underground pit 3a: Side wall 3b: Bottom wall 3c: Partition wall 3d: Communication path 3e:Storage tank 3F: Storage tank 3g: Grating (lattice-shaped lid) 3h: Drain hole 3s: gap 5: Guide rail 7: Waterstop 7a: Cover member 11: Drainage mechanism 11a: Drainage pipe 11b: U-shaped tube 11c: Box member 11d: Cleaning pipe 15: Sewer pipe 17:Domestic drainage pipe h: Height of underground pit g: Height of the connecting passage Lh: Drain hole position

Claims

1. an underground pit having an interior space opening upward and a bottom wall; a partition wall that divides the internal space of the underground pit horizontally into a storage tank and a storage tank, and that forms a communication passage between the lower end and the bottom wall to connect the storage tank and the storage tank; A waterstop plate stored in a storage tank of the underground pit so as to be able to rise and fall; a through-hole provided in the bottom wall, which is a drainage hole for allowing natural drainage to an external sewer pipe via a drainage mechanism when buried; and The water stop is configured to be able to rise by buoyancy or pressure, or buoyancy and pressure, received from water that has flowed into the storage tank through the communication passage or the drainage hole, or the communication passage and the drainage hole. A water stopping device characterized by:

2. A guide structure is provided to guide the rising of the waterstop at least outside the underground pit and to assist in maintaining the raised state.

2. The waterproof device according to claim 1.

3. The drain hole is provided in a portion of the bottom wall below the reservoir tank.

3. The waterproof device according to claim 1 or 2.

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