Drainage system and drainage manhole

Abstract

To provide a drainage system that can appropriately detect occurrence of backflow of water in a drainage pipe line that forms a drainage flow channel.SOLUTION: A drainage system 10 comprises: a drainage pipe line 20 forming a drainage channel C; a drainage basin 60 provided in the middle of the drainage channel C; and a control device 120, wherein the drainage basin 60 comprises: a drainage basin body 70 having a storage space 70a capable of storing water; a backflow suppression valve 90 arranged inside the drainage basin body 70; and a detection device 100 for detecting an operating state of the backflow suppression valve 90. The backflow suppression valve 90 has a valve body 94 capable of being displaced in response to a flow of the water, and a valve seat 92 for receiving the valve body 94. The control device 120 determines that the water is flowing in an opposite direction in the drainage pipe line 20 on a condition that the valve body 94 is detected in an area where the valve body 94 is expected to arrive due to the flow of the water in the opposite direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a drainage system and a drainage mass.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1 below, a sewage discharge system that discharges sewage from drainage facilities to a main sewer pipe has been provided. Examples of drainage facilities include toilets, bathtubs, or kitchen sinks. This type of sewage discharge system includes a drainage pipe that connects the drainage facility and the main sewer pipe. The sewage flowing out from the drainage facility is discharged to the main sewer pipe through the drainage pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the sewage discharge system of Patent Document 1, when the main sewer pipe is damaged due to disasters such as earthquakes or tsunamis, by switching the sewage discharge destination to a different flow path from the normal time, it is possible to suppress the backflow of sewage into the room or the overflow of sewage onto the ground (overflow). Thus, the sewage discharge system of Patent Document 1 can ensure the function of the drainage facility during disasters.

[0005] Incidentally, when introducing a wastewater discharge system like the one described in Patent Document 1, large-scale disasters are increasingly anticipated in recent years, and it is anticipated that the period until repairs to the main sewer pipes and other restoration work will be prolonged. In this case, when a wastewater drainage system provides a separate drainage channel from the normal one, storage tanks with limited storage capacity are often installed. In the event of a disaster, it is conceivable that the drainage channel should be switched as quickly as possible to avoid wastewater flowing into the building and creating unsanitary conditions. However, if the drainage channel is switched prematurely, even in situations that are not particularly urgent, the storage capacity may exceed its limit when needed, rendering the installed storage tanks and other equipment unusable. On the other hand, if the timing of switching the drainage channel is delayed, there is a concern that it may become difficult to prevent wastewater from flowing into the building or to switch the drainage channel.

[0006] Thus, measures were needed to ensure that the switching of drainage channels in emergencies was carried out at the appropriate time. On the other hand, since drainage pipes are buried underground, they are difficult to see from the outside. Therefore, it was difficult to grasp the status of the drainage system in a timely manner. Accordingly, in systems equipped with a drainage channel switching function, such as the sewage discharge system in Patent Document 1, it is desirable to be able to detect the backflow of sewage.

[0007] Furthermore, not only are there drainage systems equipped with a drainage channel switching function, such as the wastewater discharge system in Patent Document 1, but even in drainage systems that do not have a drainage channel switching function, it is desirable to be able to detect wastewater backflow at an appropriate time in order to take appropriate measures against wastewater backflow.

[0008] Therefore, the present invention aims to provide a drainage system capable of appropriately detecting the occurrence of water backflow in a drainage pipeline that forms a drainage channel for draining water from the upstream side (indoors) to the downstream side, and a drainage manhole that can be suitably used in said drainage system. [Means for solving the problem]

[0009] (1) The drainage system of the present invention, provided to solve the above-mentioned problems, comprises a drainage pipeline that forms a drainage channel for draining water from the upstream side, which is the indoor side, to the downstream side; a drainage manhole provided in the middle of the drainage channel; and a control device, wherein the drainage manhole comprises a drainage manhole body having a storage space capable of storing water; a backflow suppression valve disposed inside the drainage manhole body that allows water to flow in the forward direction from the upstream side to the downstream side and restricts water to flow in the opposite direction to the forward direction; and a detection device that detects the operating state of the backflow suppression valve, wherein the backflow suppression valve has a valve body that can be displaced by the flow of water, and a valve seat that receives the valve body, and the control device determines that water is flowing in the reverse direction in the drainage pipeline, provided that the valve body is detected in a region where it is assumed that the valve body will arrive due to the flow of water in the reverse direction.

[0010] The drainage system of the present invention is equipped with a backflow suppression valve located inside a drainage manhole body that forms a drainage manhole in the middle of a drainage channel, and the valve body is capable of being displaced by the flow of water. Furthermore, the drainage system of the present invention is capable of performing a notification operation by a notification device when a detection device detects that the valve body has arrived in a region where it is expected to arrive due to the flow of water in the reverse direction.Therefore, the drainage system of the present invention can appropriately detect when backflow of water occurs in a drainage pipeline that forms a drainage channel for draining water from the upstream side (indoors) to the downstream side.

[0011] (2) The drainage system of the present invention described above is characterized in that the detection device has a detection unit provided on one of the valve body and the valve seat, and a detected unit provided on the other of the valve body and the valve seat, and the detected unit can be detected by the detection unit at a position where the valve body is expected to arrive due to the flow of water in the reverse direction.

[0012] The drainage system of the present invention employs a detection device in which a detection unit is provided on one of the valve body and valve seat, and the detection unit provided on the other is detectable by the detection unit. Furthermore, the detection device of the drainage system of the present invention is capable of detecting the detection unit at the position where the valve body is expected to arrive due to the flow of water in the reverse direction. Therefore, the drainage system of the present invention can appropriately detect when backflow of water occurs in the drainage pipe at the timing when the valve body has been displaced to a state in which the detection unit is detectable by the detection unit.

[0013] (3) The drainage system of the present invention described above is preferably characterized in that the detected part contains a metal member or a metal material, and the detection part is capable of detecting the metal forming the detected part.

[0014] By having this configuration, the drainage system of the present invention can appropriately detect when backflow of water occurs in the drainage pipe based on the operation of the valve body.

[0015] (4) The drainage system of the present invention described above is preferably characterized in that the drainage manhole body has an inlet connection port connected by piping to the upstream side of the drainage channel, an outlet connection port connected by piping to the downstream side of the drainage channel, and a valve pipe connected to the inlet connection port inside the storage space, wherein the valve pipe has a valve pipe opening that opens toward the storage space, the valve seat is provided at the opening end of the valve pipe opening, and the valve body is provided so as to be able to open and close the valve pipe opening.

[0016] The drainage system of the present invention, with this configuration, can detect when water has flowed back into the storage space of the drainage manhole body up to the position of the valve pipe opening provided in the valve pipe. Therefore, the drainage system of the present invention can appropriately detect when water backflow occurs at the time when there is a concern that water may flow back upstream through the valve pipe opening.

[0017] (5) The drainage system of the present invention described above is preferably characterized in that the valve pipe opening is located above the outlet side connection port.

[0018] The drainage system of the present invention, with this configuration, can detect when water has flowed back into the storage space of the drainage manhole body up to the position of the valve pipe opening, which is located higher than the height of the outlet side connection port. Therefore, the drainage system of the present invention can detect when water backflow occurs at the time when there is a concern that water may flow back upstream through the valve pipe opening.

[0019] (6) The drainage system of the present invention described above is characterized in that the valve pipe has an overhang-like portion formed to be inclined from the downstream side to the upstream side as it extends from above downward, the valve pipe opening is provided in the overhang-like portion, the valve body is pivotally supported at the upper end of the valve pipe opening and is swingable at the lower end in a direction toward and toward the valve pipe opening, and the valve body approaches the valve seat provided at the opening end of the valve pipe opening as water flows toward it from the downstream side to the upstream side.

[0020] As described above, the drainage system of the present invention is equipped with a valve body and a valve seat, which allows water to flow from upstream to downstream while reliably restricting water flow from downstream to upstream.

[0021] (7) The drainage system of the present invention described above is characterized in that the detection device has a detected part and a detection part capable of detecting the detected part which is within a predetermined detection range, with one of the detected part and the detection part provided on the valve body side and the other on the valve pipe side, the backflow suppression valve operates such that at least a part of the valve body enters the inside of the overhang-shaped part when a flow of water acts on the valve body in the direction from the downstream side to the upstream side, the part of the detected part and the detection part provided on the valve pipe side is provided on the overhang-shaped part, and the part of the detected part and the detection part provided on the valve body side is provided on the part which enters the inside of the overhang-shaped part.

[0022] In the drainage system of the present invention, the detection unit and the detection unit located on the valve pipe side are provided in the canopy-shaped section, while the detection unit located on the valve body side is provided in the portion of the valve body that extends inside the canopy-shaped section. Therefore, the drainage system of the present invention can reliably detect backflow of water when the valve body is in a state where it has moved inside the canopy-shaped section due to the action of water flowing from downstream to upstream.

[0023] (8) The drainage system of the present invention described above is characterized in that the drainage channel comprises a first channel that forms a drainage channel for normal use, and a second channel that is separate from the first channel and is formed to lead to a sewage storage tank, and a channel switching member provided in the middle of the drainage channel makes it possible to switch between a state in which water flows through the first channel and a state in which water flows through the second channel, and the drainage manhole is provided on the first channel downstream of the channel switching member.

[0024] The drainage system of the present invention can detect the occurrence of backflow of water in the drainage channel in the drainage mass provided on the downstream side of the flow path switching member. Therefore, the drainage system of the present invention can switch the second flow path to a state in which water flows by means of the flow path switching member located upstream of the drainage mass based on the timing when backflow of water is detected in the drainage mass. Thereby, the drainage system of the present invention can suppress the backflow of water up to the upstream side beyond the flow path switching member even in a situation where backflow of water is assumed, and can make the water discharged from the upstream side drainable to the sewage storage tank via the second flow path.

[0025] (9) The drainage mass of the present invention includes a drainage mass main body having a storage space capable of storing water, a valve body arranged inside the drainage mass main body and displaceable upon receiving the flow of water, and a valve seat for receiving the valve body, and has a backflow prevention valve that allows the flow of water in the forward direction from the upstream side to the downstream side and restricts the flow of water in the direction opposite to the forward direction, and a detection device for detecting the operating state of the backflow prevention valve. The drainage mass main body has an inflow side connection port connected to a pipe on the upstream side, an outflow side connection port connected to a pipe on the downstream side, and a valve pipe connected to the inflow side connection port inside the storage space. The valve pipe has a valve pipe opening portion opening toward the storage space, the valve seat is provided at the opening end of the valve pipe opening portion, the valve body is provided so as to be able to open and close the valve pipe opening portion, the detection device has a detection portion provided on one of the valve body side and the valve seat side, and a detected portion provided on the other of the valve body side and the valve seat side, and the detected portion can be detected by the detection portion at a position where the valve body is assumed to arrive upon receiving the flow of water in the reverse direction.

[0026] The drain mass of the present invention includes a valve body that can be displaced by receiving the flow of water, and by receiving the flow of water in the reverse direction, at the timing when water has flowed back into the storage space of the drain mass body up to the position of the valve pipe opening provided in the valve pipe, it can detect that the backflow of water is occurring. Therefore, the drain mass of the present invention can appropriately detect that the backflow of water is occurring at the timing when there is a concern that water may flow back upstream through the valve pipe opening.

Advantages of the Invention

[0027] According to the present invention, it is possible to provide a drainage system that can appropriately detect that a backflow of water has occurred in a drainage pipe that forms a drainage flow path for draining water from the upstream side (indoorside) to the downstream side.

Brief Description of the Drawings

[0028] [Figure 1] FIG. 1 is a schematic diagram showing a drainage system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing a state in which the valve body of the drain mass used in the drainage system of FIG. 1 is in an open state. [Figure 3] FIG. 3 is a cross-sectional view showing a state in which the valve body of the drain mass used in the drainage system of FIG. 1 is in a closed state. [Figure 4] FIG. 4 is a schematic diagram showing the normal drainage flow path of the drainage system of FIG. 1. [Figure 5] FIG. 5 is a schematic diagram when switching promotion notification of the drainage system of FIG. 1 is performed. [Figure 6] FIG. 6 is a schematic diagram showing the emergency drainage flow path of the drainage system of FIG. 1.

Embodiments for Carrying Out the Invention

[0029] Hereinafter, the drainage system 10 according to an embodiment of the present invention will be specifically described while referring to the drawings. FIG. 1 is a schematic diagram showing the drainage system 10.

[0030] It should be noted that in the original text, there is an error in the reference of FIG. 2, FIG. 3, FIG. etc. in the description. It is assumed that the correct figure numbers are used in the translation for the sake of consistency with the overall context. If there are specific requirements for maintaining the original incorrect figure number references, they can be adjusted accordingly.The drainage system 10 drains wastewater from the upstream side, which is the indoor side 2, to the downstream side. More specifically, the drainage system 10 drains wastewater from the drainage equipment 3 located in the indoor side 2 of building 1 to the main sewer pipe 4 outside building 1.

[0031] In the following explanation of the wastewater flow path, the indoor 2 side may be simply referred to as the "upstream side," and the sewer main 4 side may be simply referred to as the "downstream side."

[0032] Furthermore, "building" refers to any structure with at least walls, including houses, commercial facilities, factories, school buildings, and warehouses. "Indoors" includes not only the space above the floor enclosed by a roof and walls, but also the space below the floor. In a plan view, the area enclosed by walls is considered "inside the building."

[0033] "Wastewater" refers to water discharged from sources such as toilets, baths, and kitchen sinks, which cannot be discharged directly into rivers. "Drainage facilities" are facilities that discharge wastewater. Examples of drainage facilities include toilets, baths, and kitchen sinks.

[0034] Figure 1 illustrates one drainage system 3 installed within a single building 1, but the number of buildings 1 and drainage systems 3 is not particularly limited. The number of buildings 1 in which the drainage system 10 is installed may be one or multiple. Also, the indoor space 2 may have only one drainage system 3, or it may have multiple drainage systems 3.

[0035] Furthermore, the main sewer pipe 4 is a pipe that carries wastewater to a wastewater treatment plant (not shown). Under normal circumstances, wastewater flowing out of the drainage facility 3 of building 1 is discharged into the main sewer pipe 4.

[0036] In this specification, "drainage manhole" includes various types of drainage manholes, such as sewage manholes, rainwater manholes, and public manholes. Furthermore, in this specification, "drainage manhole" is described as including not only the manhole body but also inspection pipes and covers.

[0037] As shown in Figure 1, the drainage system 10 includes a drainage pipeline 20, a switchable drainage manhole 30 (flow path switching member), a drainage manhole 60, a sewage storage tank 110, a control device 120, and an alarm device 130.

[0038] The drainage system 10 is configured such that a switchable drainage manhole 30 (flow path switching member) and a drainage manhole 60 are placed in the middle of the wastewater drainage flow path C formed by the drainage pipe 20.

[0039] The following describes the various components of the drainage system 10, followed by the switching of the drainage channel C by the drainage system 10, and the operation of detecting and notifying of the switching of the drainage channel C at an appropriate timing.

[0040] The drainage pipeline 20 forms a drainage channel C, which is the flow path for wastewater. The drainage pipeline 20 forms a drainage channel C, which is the flow path for wastewater, by combining multiple pipes.

[0041] Furthermore, the drainage pipeline 20 allows for the selection of a first drainage channel c1 as a drainage channel C for discharging wastewater discharged from the drainage facility 3 into the main sewer pipe 4. In addition, the drainage pipeline 20 allows for the selection of a second drainage channel c2, which is a separate system from the first drainage channel c1, as a drainage channel C for discharging wastewater discharged from the drainage facility 3 into the wastewater storage tank 110.

[0042] Furthermore, "pipeline" refers to a passage through which water flows. A "pipeline" may consist of a single pipe, or, as in this embodiment, may consist of multiple pipes and fittings connecting them. Also, "drainage channel" refers to the path that water (such as sewage) follows when it is discharged.

[0043] As shown in Figure 1, the drainage pipeline 20 comprises an upstream pipe 22, a first pipe 24, a second pipe 26, and a downstream pipe 28. The upstream pipe 22 connects the drainage facility 3 to the switchable drainage manhole 30. The first pipe 24 connects the switchable drainage manhole 30 to the drainage manhole 60. The second pipe 26 connects the switchable drainage manhole 30 to the sewage storage tank 110. The downstream pipe 28 connects the drainage manhole 60 to the main sewer line 4.

[0044] The drainage pipeline 20 is configured to allow selection of a first channel c1, which drains wastewater discharged from the drainage facility 3 into the main sewer pipe 4, via the upstream pipe 22, the first pipe 24, and the downstream pipe 28. The drainage pipeline 20 is also configured to allow selection of a second channel c2, which drains wastewater discharged from the drainage facility 3 into the wastewater storage tank 110, via the upstream pipe 22 and the second pipe 26.

[0045] The drainage pipe 20 can select the first channel c1 as the normal drainage channel C for discharging wastewater into the main sewer pipe 4 via the first channel c1. In addition, the drainage pipe 20 can select the second channel c2 as the emergency drainage channel C for discharging wastewater into the indoor 2 side in case of damage to the main sewer pipe 4, the downstream pipe 28, or the first pipe 24, etc.

[0046] The drainage system 10 has a switchable drain manhole 30 (flow path switching member) connected to the upstream pipe 22, the first pipe 24, and the second pipe 26. The drainage system 10 is configured to allow selection and switching of the drainage path between the first flow path c1 and the second flow path c2 by switching the switchable drain manhole 30. Specifically, by switching the switchable drain manhole 30, the drainage system 10 can connect the upstream pipe 22 and the first pipe 24, and disconnect the upstream pipe 22 and the second pipe 26. This configuration allows drainage to the main sewer pipe 4 via the first flow path c1. On the other hand, by switching the switchable drain manhole 30, the drainage system 10 can connect the upstream pipe 22 and the second pipe 26, and disconnect the upstream pipe 22 and the first pipe 24. This configuration allows wastewater to be discharged to the wastewater storage tank 110 via the second flow path c2.

[0047] As shown in Figure 1, the switchable drainage manhole 30 is located upstream of the drainage manhole 60. The switchable drainage manhole 30 is buried underground outside the building 1. The material used to form the switchable drainage manhole 30 is not particularly limited. In this embodiment, a resin material is used to form the switchable drainage manhole 30. Examples of resin materials used to form the switchable drainage manhole 30 include polyvinyl chloride resin or polypropylene resin. When using polyvinyl chloride resin as the resin material for forming the switchable drainage manhole 30, rigid polyvinyl chloride resin can be suitably used.

[0048] In the example shown in this embodiment, no other drainage manholes are provided between the switchable drainage manhole 30 and the drainage manhole 60 in the first piping 24. The drainage system of the present invention may have one or more drainage manholes upstream of the switchable drainage manhole 30. Furthermore, the drainage system of the present invention may have a switchable drainage manhole at the point where wastewater discharged from multiple drainage facilities converges. Also, the drainage system of the present invention may use other means, such as a joint, as the flow path switching member.

[0049] As shown in Figures 2 and 3, the drainage manhole 60 is a drainage manhole located downstream of the switchable drainage manhole 30 in the drainage channel C. The drainage manhole 60 can be any type of drainage manhole, such as a sewage manhole or a rainwater manhole, as long as it is located downstream of the switchable drainage manhole 30. Furthermore, the material used to form the drainage manhole 60 is not particularly limited. In this embodiment, a resin material is used to form the drainage manhole 60. Examples of resin materials used to form the drainage manhole 60 include polyvinyl chloride resin, polypropylene resin, and reinforced fiber plastic. When using polyvinyl chloride resin as the resin material for forming the drainage manhole 60, rigid polyvinyl chloride resin can be suitably used. Note that the drainage manhole in the drainage system of the present invention may have the manhole body and inspection pipe made of concrete or the like. As shown in Figures 2 and 3, the drainage manhole 60 comprises a drainage manhole body 70, a valve pipe 80, a backflow suppression valve 90, and a detection device 100.

[0050] The drain manhole body 70 is a substantially cylindrical, bottomed member. The drain manhole body 70 is provided with an inlet-side connection port 72 and an outlet-side connection port 74 on its circumferential surface, and an end opening 76 provided on the upper end in the axial direction. A cover (not shown) is detachably attached to the end opening 76.

[0051] The height of the drain manhole body 70, the diameter of the end opening 76, and the shape of the opening can be appropriately selected according to the use and installation location of the drain manhole 60. In this embodiment, both the cross-sectional shape of the drain manhole body 70 and the shape of the end opening 76 are approximately circular. Furthermore, the height of the drain manhole body 70 from the end opening 76 to the inlet-side connection port 72 and the outlet-side connection port 74 is equal to or greater than the length of an adult's arm, which is typical for an adult of average build.

[0052] The inlet-side connection port 72 is an opening formed to penetrate the circumferential surface of the drain manhole body 70. The inlet-side connection port 72 is provided with an inlet-side connection portion 72a. The inlet-side connection portion 72a is the part to which a pipe located upstream of the drain manhole 60 is connected in the drainage channel C where the drain manhole 60 is installed. In this embodiment, the first pipe 24 is connected to the inlet-side connection portion 72a. The inlet-side connection portion 72a is a cylindrical part formed to protrude outward from the circumferential surface of the drain manhole body 70. Specifically, the inlet-side connection portion 72a protrudes in a direction intersecting the axial direction of the drain manhole body 70 (in this embodiment, a direction approximately perpendicular).

[0053] The inlet connection section 72a communicates with the storage space 70a formed inside the drainage manhole body 70 via the inlet connection port 72. Furthermore, the inlet connection section 72a is watertightly connected to the inlet connection port 72. Therefore, the drainage manhole 60 can introduce wastewater discharged from the upstream side into the manhole 60 via the inlet connection section 72a.

[0054] In addition to the inlet connection section 72a described above, the inlet connection port 72 is also configured to allow connection of a valve pipe 80, which will be described in detail later, inside the drain manhole body 70. Furthermore, the inlet connection port 72 is located above the outlet connection port 74.

[0055] The outlet-side connection port 74 has substantially the same configuration as the inlet-side connection port 72. Specifically, the outlet-side connection port 74 is an opening formed to penetrate the circumferential surface of the drain manhole body 70. The outlet-side connection port 74 is provided with an outlet-side connection portion 74a.

[0056] The outlet-side connection portion 74a is the portion to which the piping located downstream of the drain manhole 60 is connected. In this embodiment, the downstream piping 28 is connected to the outlet-side connection portion 74a. The outlet-side connection portion 74a is a cylindrical portion that protrudes outward from the circumferential surface of the drain manhole body 70. Specifically, the outlet-side connection portion 74a protrudes in a direction intersecting the axial direction of the drain manhole body 70 (in this embodiment, a direction approximately perpendicular). The arrangement of the outlet-side connection portion 74a relative to the inlet-side connection portion 72a described above can be appropriately selected depending on the use and installation location of the drain manhole 60. In this embodiment, the outlet-side connection portion 74a is provided on the radially opposite side of the drain manhole 60 to the inlet-side connection portion 72a described above (at a position shifted 180 degrees in the circumferential direction).

[0057] The outlet-side connection section 74a communicates with the storage space 70a formed inside the drainage manhole body 70 via the outlet-side connection port 74. Furthermore, the outlet-side connection section 74a is watertightly connected to the outlet-side connection port 74. Therefore, the drainage manhole 60 can discharge wastewater introduced into the manhole 60 via the inlet-side connection port 72 to the downstream side via the inlet-side connection section 72a.

[0058] The valve pipe 80 is a component that is attached to the inlet-side connection port 72 or outlet-side connection port 74 from the inside of the drain manhole body 70. In the drain manhole 60 of this embodiment, the valve pipe 80 communicates with the inlet-side connection port 72 by being attached to the inlet-side connection port 72. Furthermore, the valve pipe 80 can be selected as appropriate, such as one equipped with a filter, one equipped with an orifice, or one equipped with a backflow prevention function. In this embodiment, a valve pipe 80 equipped with a backflow prevention function is used. Specifically, as shown in Figures 2 and 3, the valve pipe 80 comprises a valve pipe body 82 and a detachable part 84.

[0059] The valve pipe body 82 is a roughly cylindrical portion that forms the main part of the valve pipe 80. The valve pipe body 82 communicates with the attachment / detachment part 84 at one end (base end), and the valve pipe opening 82a is open at the other end (tip). Furthermore, when the valve pipe body 82 is attached to the drain manhole 60 and viewed from the side, the end face of the other end (tip) (the opening edge of the valve pipe opening 82a) is formed to be inclined diagonally downward. That is, the valve pipe body 82 has a canopy-like portion 82b at the other end (tip) that is formed to be inclined from the downstream side to the upstream side of the valve pipe 80 as it goes from top to bottom. The valve pipe opening 82a is formed at the end of the canopy-like portion 82b toward the storage space 70a formed inside the drain manhole body 70. Therefore, the valve pipe body 82 is formed such that, when the valve pipe 80 is attached to the drain manhole 60, the valve pipe opening 82a at the other end (tip) opens diagonally downward. Furthermore, the valve pipe opening 82a opens above the outlet side connection port 74.

[0060] The detachable portion 84 is a cylindrical part formed to communicate with the base end of the valve pipe body 82. The detachable portion 84 is designed to be inserted into the inlet-side connection port 72 described above from the inside of the drain manhole body 70 and connected. In this embodiment, the detachable portion 84 is designed to be detachable from the inlet-side connection port 72, for example, by a bayonet-type detachable structure, while also being difficult to detach even under the influence of water flow.

[0061] The backflow suppression valve 90 is a valve located inside the drain manhole body 70. The backflow suppression valve 90 allows water to flow in the forward direction from upstream to downstream and restricts water flow in the reverse direction. The backflow suppression valve 90 has a valve seat 92 and a valve body 94.

[0062] The valve seat 92 receives the valve body 94 described above. The valve seat 92 is composed of the opening end of the valve pipe opening 82a itself, or a member separately provided at the opening end of the valve pipe opening 82a.

[0063] The valve body 94 is displaceable in response to the flow of water. The valve body 94 is capable of opening and closing the valve pipe opening 82a provided in the valve pipe 80 described above. The valve body 94 is pivotally supported by a support shaft 96 at the upper end of the valve pipe opening 82a. The portion of the valve body 94 below the support shaft 96 is capable of swinging in a direction toward or away from the valve pipe opening 82a. Furthermore, the valve body 94 is designed to have a size and shape that allows it to close substantially the entire opening area of ​​the valve pipe opening 82a.

[0064] In normal operation, the valve body 94 hangs down due to gravity, as shown in Figure 2. In contrast, as described above, the valve pipe opening 82a, located at the tip of the valve pipe body 82, opens with its end face inclined diagonally downwards. Therefore, in normal operation, the valve body 94 is separated from the valve pipe opening 82a at the tip of the valve pipe body 82, and the valve pipe opening 82a is in an open state. As a result, the valve body 94 has the function of allowing water to flow towards the inside of the drain manhole body 70 via the inlet connection port 72.

[0065] In contrast, when wastewater flows back into the drain manhole body 70 through the outlet connection 74a, and an external force acts on the valve body 94 in a direction toward the valve pipe body 82, the valve body 94 swings, as shown in Figure 3, and the valve pipe opening 82a becomes closed. When the valve body 94 closes the valve pipe opening 82a, a part of it fits into the overhang portion 82b of the valve pipe body 82. By closing the valve pipe opening 82a in this way, the valve body 94 has the function of preventing or suppressing the backflow of water from the drain manhole body 70 toward the outside of the drain manhole body 70 through the inlet connection port 72.

[0066] The detection device 100 detects the operating state of the backflow suppression valve 90 described above. The detection device 100 has a detected unit 102 and a detection unit 104. The detected unit 102 and the detection unit 104 are used as a pair to detect the operating state of the backflow suppression valve 90. One of the detected unit 102 and the detection unit 104 is provided on the valve body 94 side of the backflow suppression valve 90, and the other is provided on the valve seat 92 side. In this embodiment, the detected unit 102 is provided on the valve body 94 side, and the detection unit 104 is provided on the valve seat 92 side.

[0067] The detected part 102 is composed of a metal member that can be detected by the detection part 104. The detected part 102 is provided in the portion of the valve body 94 that enters the inside of the valve pipe 80 when the valve body 94 closes the valve pipe opening 82a. Specifically, the detected part 102 is provided on the top surface 94a side of the valve body 94. The detected part 102 is provided in a position opposite the overhang portion 82b of the valve pipe body 82 when the valve body 94 closes the valve pipe opening 82a. The metal member forming the detected part 102 can be provided on the valve body 94 by fixing it to the outside of the valve body 94 by adhesive or by embedding it inside the valve body 94. In this embodiment, a metal plate (for example, an iron plate) forming the detected part 102 is housed in a hollow portion of the valve body 94. This configuration allows the detection unit 104 to position the detection unit 102 in a location where it can be sufficiently detected, while suppressing water exposure and subsequent rusting of the detection unit 102.

[0068] The detection unit 104 is capable of detecting the detected portion 102 provided on the valve body 94 within a predetermined detection range. The detection unit 104 is designed to detect the detected portion 102 provided on the valve body 94 in the region where the valve body 94 is expected to arrive due to the flow of water in the reverse direction (from downstream to upstream). In this embodiment, since the detected portion 102 is made of a metal component, the detection unit 104 is made of a sensor capable of detecting the metal that makes up the detected portion 102. Furthermore, when backflow of water occurs, the valve body 94 swings toward the valve pipe opening 82a side of the valve pipe body 82, and the detected portion 102 approaches the overhang portion 82b. For this reason, the detection unit 104 is provided on the overhang portion 82b of the valve pipe body 82. The detection unit 104 is connected to the control device 120, which will be described in detail later, by wire or wireless connection. As a result, the detection device 100 can output information (valve body operation detection signal) to the control device 120 when the detection unit 104 detects the unit to be detected 102.

[0069] The sewage storage tank 110 is a tank for storing sewage discharged from the drainage facility 3. As shown in Figure 1, the sewage storage tank 110 is located outside the building 1 and is buried underground. As shown in Figure 1, the sewage storage tank 110 is connected to the switchable drainage manhole 30 via the second pipe 26. Sewage flowing from the second outlet 36 is stored in the sewage storage tank 110. The sewage storage tank 110 has a sealed space inside. Because the sewage storage tank 110 is sealed, malodorous odors generated from the sewage inside the sewage storage tank 110 do not leak to the outside. The sewage storage tank 110 does not necessarily have to be buried underground. The sewage storage tank 110 may be installed above ground.

[0070] The control device 120 receives information (valve body operation detection signal) output from the detection device 100 and determines whether or not water backflow is occurring in the drainage pipe 20 based on the received valve body operation detection signal. The control device 120 determines that water backflow is occurring in the drainage pipe 20, using the detection of the detected part 102 by the detection unit 104 (receiving the valve body operation detection signal) as part or all of the determination conditions. In this embodiment, the control device 120 determines that water backflow is occurring in the drainage pipe 20 by receiving the valve body operation detection signal. Furthermore, if the control device 120 determines that water backflow is occurring in the drainage pipe 20, it performs control to activate the notification device 130.

[0071] The notification device 130 operates under the control of the control device 120 when the control device 120 determines that water backflow is occurring in the drainage pipe 20, and provides a notification to encourage switching. Specifically, the notification device 130 operates the switching member 40 of the switchable drainage manhole 30 to provide a notification (switching-prompt notification) to encourage switching to the second flow path c2. In this embodiment, the notification device 130 is a terminal device installed in the equipment monitoring room 8. The notification device 130 in this embodiment provides a switching-prompt notification by outputting sound and displaying images.

[0072] The notification device 130 may be any terminal device that has the function of outputting sound such as voice or displaying images. For example, the notification device 130 may be a speaker that receives a valve body operation detection signal and provides a voice notification to encourage switching. Alternatively, the notification device 130 may receive a valve body operation detection signal and provide a notification to encourage switching using visually recognizable information. For example, the notification device 130 may provide a notification to encourage switching by lighting a lamp, outputting an alarm sound, or displaying an image.

[0073] Furthermore, although this embodiment shows an example in which the control device 120 and the notification device 130 are installed in the equipment monitoring room 8, the drainage system of the present invention is not limited to this. For example, in the drainage system of the present invention, the notification device 130 may be installed in a location other than the equipment monitoring room 8. Note that the equipment monitoring room 8 may be installed indoors 2 of building 1, or it may be installed in a location other than building 1.

[0074] <Normal and emergency drainage routes and timing of switchover notification> Next, referring to Figures 4 to 6, the drainage channel C of the drainage system 10 during normal and emergency conditions, and the timing of the switching prompt notification will be explained. Under normal conditions, the drainage system 10 discharges wastewater flowing from the drainage facility 3 into the main sewer pipe 4. In addition, in the event of an emergency, such as an earthquake, tsunami, or flood causing damage to the main sewer pipe 4, the drainage system 10 can be used by switching the drainage channel C of the switchable drainage manhole 30, allowing wastewater flowing from the drainage facility 3 to be discharged into the wastewater storage tank 110.

[0075] <Normal drainage channel> As shown in Figure 4, under normal circumstances, the drainage system 10 drains wastewater discharged from the drainage facility 3 into the main sewer pipe 4 via the first channel c1. More specifically, when draining via the first channel c1, the switching operation of the switchable drainage manhole 30 connects the upstream pipe 22 and the first pipe 24, while disconnecting the upstream pipe 22 and the second pipe 26. As a result, wastewater flowing out of the drainage facility 3 is drained into the main sewer pipe 4 via the first channel c1. The wastewater that flows into the main sewer pipe 4 is then discharged to a wastewater treatment plant or similar facility for treatment.

[0076] <When switching prompt notification is issued> As shown in Figure 5, when a disaster such as an earthquake, tsunami, or flood occurs and sewage flows back into the drain manhole 60 due to damage to the main sewer pipe 4 or drainage pipeline, the water flow generated by the sewage backflow causes the valve body 94 of the backflow suppression valve 90 installed in the drain manhole 60 to swing so as to close the valve pipe opening 82a. When the valve body 94 performs this operation, the detection unit 102 installed in the valve body 94 is detected by the detection unit 104 installed in the valve pipe body 82, and a valve body operation detection signal is output from the detection device 100 to the control device 120. Upon receiving the valve body operation detection signal, the control device 120 determines that water backflow is occurring in the drainage pipeline 20 and performs control to activate the notification device 130. In response, the notification device 130 provides a switching-prompt notification to encourage switching the drainage channel C to the second channel c2 by switching the switchable drain manhole 30.

[0077] Specifically, the notification device 130 operates based on the valve body operation detection signal and provides a notification to encourage switching in a manner that can be recognized by the administrator. The notification to encourage switching can be provided, for example, by the notification device 130, which is a terminal device installed in the equipment monitoring room 8, through the output of an audio message such as "An abnormal water level has been detected. Please switch the flow path" or by displaying an image. This allows the administrator to recognize that it is necessary to switch the flow path.

[0078] In this way, the drainage system 10 can notify the drainage manhole 60 at the time backflow is detected that in an emergency, a switching operation needs to be performed at the switchable drainage manhole 30 to switch from the first flow path c1 used under normal conditions to a separate second flow path c2.

[0079] <Emergency drainage channels> Upon receiving a notification prompting switching, the administrator performs the switching operation of the switchable drainage manhole 30. As shown in Figure 6, the drainage channel C is switched to the second channel c2, which discharges the wastewater from the drainage facility 3 into the wastewater storage tank 110. This allows the drainage system 10 to discharge the wastewater flowing out of the drainage facility 3 through the upstream piping 22, via the switchable drainage manhole 30, and into the wastewater storage tank 110.

[0080] The drainage system 10 described above can produce unique effects through its distinctive configuration, as described in (1) to (10) below.

[0081] (1) The drainage system 10 described above comprises a drainage pipe 20 that forms a drainage channel C for draining water from the upstream side, which is the indoor side, to the downstream side, a drainage manhole 60 provided in the middle of the drainage channel C, and a control device 120. The drainage manhole 60 comprises a drainage manhole body 70 having a storage space 70a capable of storing water, a backflow suppression valve 90 disposed inside the drainage manhole body 70 that allows water to flow in the forward direction from the upstream side to the downstream side and restricts water flow in the reverse direction, and a detection device 100 that detects the operating state of the backflow suppression valve 90. The backflow suppression valve 90 also has a valve body 94 that can be displaced by the flow of water, and a valve seat 92 that receives the valve body 94. The drainage system 10 is configured such that the control device 120 determines that water is flowing in the reverse direction in the drainage pipe 20, on the condition that the valve body 94 is detected in the region where it is expected to arrive due to the flow of water in the reverse direction. Because of this configuration, the drainage system 10 can appropriately detect when backflow of water occurs in the drainage pipe 20, which forms a drainage channel C for draining water from the upstream side (indoors 2) to the downstream side.

[0082] (2) The drainage system 10 of this embodiment has a detection device 100 which includes a detection unit 104 provided on one of the valve body 94 and the valve seat 92, and a detected part 102 provided on the other of the valve body 94 and the valve seat 92, and the detected part 102 is detectable by the detection unit 104 at the position where the valve body 94 is expected to arrive due to the flow of water in the reverse direction. As a result the drainage system 10 can appropriately detect that backflow of water has occurred in the drainage pipe 20 at the timing when the valve body 94 has been displaced until the detected part 102 is in a state where it can be detected by the detection unit 104.

[0083] (3) In this embodiment, the drainage system 10 has a detection unit 102 that contains a metal member or a metal material, and the detection unit 104 is capable of detecting the metal that makes up the detection unit 102. As a result, the drainage system 10 can appropriately detect when backflow of water occurs in the drainage pipe 20 based on the operation of the valve body 94.

[0084] In this embodiment, as shown in (3) above, an example was shown in which the detection device 100 comprises a metal detected part 102 and a detection unit 104 capable of detecting the metal forming the detected part 102. However, the present invention is not limited to this. For example, the detection device 100 may be composed of a switch that operates in conjunction with the operation of the valve body 94, a sensor capable of detecting the position and operation of the valve body 94, a camera capable of photographing the valve body 94, or other components different from those described above.

[0085] (4) In the drainage system 10 of this embodiment, the drainage manhole body 70 has an inlet connection port 72 connected by piping to the upstream side of the drainage channel C, an outlet connection port 74 connected by piping to the downstream side of the drainage channel C, and a valve pipe 80 connected to the inlet connection port 72 inside the storage space 70a. The drainage system 10 also has a valve pipe opening 82a that opens toward the storage space 70a, a valve seat 92 is provided at the opening end of the valve pipe opening 82a, and a valve body 94 is provided so as to be able to open and close the valve pipe opening 82a. Because the drainage system 10 is configured in this way, it is possible to detect the occurrence of water backflow when water has flowed back into the storage space 70a of the drainage manhole body 70 up to the position of the valve pipe opening 82a provided in the valve pipe 80. Therefore, the drainage system 10 can properly detect when water backflow occurs at the time when there is a concern that water may backflow upstream through the valve pipe opening 82a.

[0086] In this embodiment, as shown in (4) above, an example is shown in which a valve body 94 is provided at the valve opening 82a of the valve pipe 80, but the present invention is not limited thereto. For example, the drainage system 10 may not have a valve pipe 80, but may be configured to have a backflow suppression valve 90 functioning at another location.

[0087] (5) In this embodiment, the drainage system 10 has a valve pipe opening 82a located above the outlet side connection port 74. This allows the drainage system 10 to detect water backflow when water has flowed back into the storage space 70a of the drainage manhole body 70 up to the position of the valve pipe opening 82a, which is located higher than the height of the outlet side connection port 74. Therefore, the drainage system 10 in this embodiment can detect water backflow when there is a concern that water may flow back upstream through the valve pipe opening 82a.

[0088] In this embodiment, as described in (5) above, a configuration in which the valve pipe opening 82a is located above the outlet-side connection port 74 has been illustrated, but the present invention is not limited thereto. For example, the drainage system 10 may also be configured such that the valve pipe opening 82a is located at approximately the same height as the outlet-side connection port 74.

[0089] (6) The drainage system 10 of this embodiment has a canopy-shaped portion 82b formed so that the valve pipe 80 slopes from downstream to upstream as it extends from top to bottom. The drainage system 10 also has a valve pipe opening 82a provided in the canopy-shaped portion 82b, and a valve body 94 is pivotally supported at the upper end of the valve pipe opening 82a and is swingable at the lower end in a direction toward or away from the valve pipe opening 82a. As a result, when water flows toward the valve body 94 in the direction from downstream to upstream, the drainage system 10 is configured such that the valve body 94 approaches the valve seat 92 provided at the opening end of the valve pipe opening 82a. Because the drainage system 10 of this embodiment is configured in this way, it is possible to allow water to flow toward the upstream direction while reliably restricting water to flow toward the upstream direction.

[0090] In this embodiment, an example with the configuration described in (6) above has been shown, but the present invention is not limited thereto. For example, the valve body 94 is not limited to one that swings as described above, but can also be one that opens and closes the opening by sliding, or one that is a so-called umbrella valve.

[0091] (7) The drainage system 10 of this embodiment has a detection device 100 which has a detected part 102 and a detection unit 104 which is capable of detecting the detected part 102 that is within a predetermined detection range, with one of the detected part 102 and the detection unit 104 provided on the valve body 94 side and the other on the valve pipe 80 side. The backflow suppression valve 90 provided in the drainage system 10 is configured to operate so that when water flows from the downstream side to the upstream side on the valve body 94, at least a part of the valve body 94 enters the inside of the canopy-shaped part 82b. In the drainage system 10, the part of the detected part 102 and the detection unit 104 that is provided on the valve pipe 80 side is provided on the canopy-shaped part 82b, and the part of the detected part 102 and the detection unit 104 that is provided on the valve body 94 side is provided on the part that enters the inside of the canopy-shaped part 82b. Because the drainage system 10 is configured in this way, when the valve body 94 is pushed inside the canopy-shaped portion 82b by the action of water flowing from downstream to upstream, it is possible to reliably detect that water is flowing backward.

[0092] In this embodiment, as shown in (7) above, an example is given in which the valve body 94 is positioned inside the canopy portion 82b, but the present invention is not limited thereto. For example, the drainage system 10 may not have a canopy portion 82b, and the valve body 94 may be configured not to enter the valve pipe 80, etc.

[0093] (8) The drainage system 10 of this embodiment is configured such that the drainage channel C comprises a first channel c1 which forms the drainage channel C for normal use, and a second channel c2 which is a separate system from the first channel c1 and is formed to lead to the sewage storage tank 110. The drainage system 10 can be switched between a state in which water flows through the first channel c1 and a state in which water flows through the second channel c2 by a switchable drainage manhole 30 provided in the middle of the drainage channel C, and a drainage manhole 60 is provided on the first channel c1 and downstream of the switchable drainage manhole 30. Because the drainage system 10 is configured in this way, the drainage manhole 60 provided downstream of the switchable drainage manhole 30 can detect when backflow of water occurs in the drainage channel C. Therefore, the drainage system 10 can switch the second channel c2 to a state in which water flows using the switchable drainage manhole 30 located upstream of the drainage manhole 60 as a reference to the timing when backflow of water is detected in the drainage manhole 60. As a result, the drainage system 10 can prevent water from flowing back upstream beyond the switchable drainage manhole 30, even in situations where backflow of water is expected, while allowing water discharged from the upstream side to be drained into the sewage storage tank 110 via the second channel c2.

[0094] In this embodiment, as shown in (8) above, the drainage channel C is provided with a first channel c1 and a second channel c2, and the selectable drainage manhole 30 allows the user to choose which channel to drain through. However, the present invention is not limited to this. The drainage system 10 may also be provided with a further number of channels as the drainage channel C, or the drainage channel C may consist only of the first channel c1, and so on.

[0095] (9) The switchable drain manhole 30 (drain manhole) of this embodiment comprises a manhole body 32 having a storage space 70a capable of storing water, a backflow suppression valve 90 disposed inside the manhole body 32 and having a valve body 94 that can be displaced by the flow of water, and a valve seat 92 that receives the valve body 94, which allows water to flow in the forward direction from the upstream side to the downstream side and restricts water to flow in the opposite direction, and a detection device 100 that detects the operating state of the backflow suppression valve 90, wherein the manhole body 32 has an inlet side connection port 72 to which piping is connected on the upstream side, an outlet side connection port 74 to which piping is connected on the downstream side, and inside the storage space 70a, the inlet side The detection device 100 has a valve pipe 80 connected to a connection port 72, the valve pipe 80 has a valve pipe opening 82a that opens toward the storage space 70a, a valve seat 92 is provided at the opening end of the valve pipe opening 82a, a valve body 94 is provided so as to be able to open and close the valve pipe opening 82a, and the detection device 100 has a detection unit 104 provided on one side of the valve body 94 side and the valve seat 92 side, and a detected part 102 provided on the other side of the valve body 94 side and the valve seat 92 side, and the detected part 102 can be detected by the detection unit 104 at a position where it is assumed that the valve body 94 will arrive due to the flow of water in the reverse direction.

[0096] The switchable drain manhole 30 of this embodiment is equipped with a valve body 94 that can be displaced by the flow of water, and by receiving the flow of water in the reverse direction, it can detect when water has flowed back into the storage space 70a of the manhole body 32 up to the position of the valve pipe opening 82a provided in the valve pipe 80. Therefore, the switchable drain manhole 30 of the present invention can appropriately detect when water backflow occurs at the time when there is a concern that water may flow back upstream through the valve pipe opening 82a.

[0097] The characteristic configuration and unique effects of the drainage system 10 according to the embodiment of the present invention have been described above, but various further modifications can be considered without departing from the spirit of the present invention. For example, in the drainage system 10 according to the embodiment described above, an example was shown in which the switchable drainage manhole 30 is provided on the site of the building 1, but the switchable drainage manhole of the drainage system of the present invention may be provided outside the building 1.

[0098] Furthermore, although the example shown above illustrates that the switchable drainage manhole 30 of the drainage system 10 according to the above embodiment is made of a processed and molded resin material, the present invention is not limited thereto. As described above, the drainage system of the present invention may also have the manhole body of the switchable drainage manhole made of concrete. In addition, the drainage system of the present invention may also have a configuration that allows the flow path to be switched using a joint or the like as a flow path switching member.

[0099] Furthermore, the method of switching flow paths by reconnecting joints requires a certain level of skill and tools. Therefore, it is desirable that the drainage system of the present invention, as in the embodiment described above, allows for switching flow paths simply by displacing the position of the switching member relative to the manhole body. In the switchable drain manhole 30 of the drainage system 10 described in this embodiment, the flow path can be easily switched simply by displacing the switching member 40 relative to the manhole body 32, and no tools are particularly required, nor are advanced skills necessary. Therefore, in the event of a disaster or other situation where the residents of a building must switch flow paths themselves, the drainage system 10 allows residents to easily switch flow paths without using tools.

[0100] Furthermore, although the drainage system 10 according to the above embodiment shows an example in which a sewage storage tank 110 is provided, the drainage system of the present invention is not limited to this. For example, when the drainage system of the present invention discharges sewage through the second channel, it may discharge it to a sewer main separate from the sewer main 4, or it may discharge the sewage to a discharge system other than these. [Industrial applicability]

[0101] The drainage system of the present invention can be suitably used as a drainage system for discharging wastewater. [Explanation of Symbols]

[0102] 2: Indoors 10: Drainage System 20: Drainage pipe 30: Switchable drain manhole (flow path switching component) 60: Drainage Manhole 70: Drainage manhole body 70a: Storage space 72: Inlet connection port 74: Outlet connection port 80: Valve Tube 82a: Valve pipe opening 82b:Eave-shaped part 90: Backflow suppression valve 92: Alveolar seat 94: Valve body 100: Detection device 102: Detected unit 104: Detection unit 110: Sewage storage tank 120: Control device C: Drainage channel c1: First channel c2:Second flow path

Claims

1. A drainage pipe that forms a drainage channel for draining water from the upstream side (indoors) to the downstream side, A drainage pit is provided in the middle of the aforementioned drainage channel, Control device and It has, The aforementioned drainage manhole, A drainage manhole body having a storage space capable of storing water, A backflow suppression valve is disposed inside the drain manhole body, which allows water to flow in the forward direction from the upstream side to the downstream side and restricts water flow in the opposite direction to the forward direction, A detection device for detecting the operating state of the backflow suppression valve, It is equipped with, The drainage manhole body has a valve pipe inside the storage space, The valve pipe has a valve pipe opening that opens toward the storage space, The backflow suppression valve has a valve body that can be displaced by the flow of water, and a valve seat that receives the valve body. A drainage system characterized in that, at the moment when there is concern that water may flow back upstream through the valve pipe opening, the control device determines that a flow of water in the reverse direction is occurring in the drainage pipe, provided that the valve body is detected in a region where it is expected to arrive due to the reverse flow of water.

2. A drainage pipe that forms a drainage channel for draining water from the upstream side, which is on the indoor side, to the downstream side, A drainage pit is provided in the middle of the aforementioned drainage channel, Control device and It has, The aforementioned drainage manhole, A drainage manhole body having a storage space capable of storing water, A backflow suppression valve is disposed inside the drain manhole body, which allows water to flow in the forward direction from the upstream side to the downstream side and restricts water flow in the opposite direction to the forward direction, A detection device for detecting the operating state of the backflow suppression valve, It is equipped with, The drainage manhole body has a valve pipe inside the storage space, The valve pipe has a valve pipe opening that opens toward the storage space, The backflow suppression valve has a valve body that can be displaced by the flow of water, and a valve seat that receives the valve body. The detection device comprises a detection unit provided on one of the valve body side and the valve pipe side, and a detection unit provided on the other of the valve body side and the valve pipe side, capable of detecting the detection unit that is within a predetermined detection range. A drainage system characterized in that the control device determines that a reverse flow of water is occurring in the drainage pipe, provided that the valve body is displaced by the reverse flow of water and the detected part comes into the detection range of the detection unit, thereby detecting the valve body.

3. The aforementioned detection device A detection unit provided on either the valve body side or the valve seat side, A detection unit provided on the valve body side and the other side of the valve seat side, It has, The drainage system according to claim 1, characterized in that the detected part can be detected by the detection part at a position where the valve body is expected to arrive due to the flow of water in the reverse direction.

4. The detected part contains a metal member or a metal material, The drainage system according to claim 3, characterized in that the detection unit is capable of detecting the metal forming the detected unit.

5. The drainage manhole body, An inlet connection port connected to the upstream side of the drainage channel, An outlet connection port connected to the downstream side of the drainage channel, It has, The valve pipe is connected to the inlet connection port inside the storage space, The valve seat is provided at the open end of the valve pipe opening, The drainage system according to any one of claims 1 to 4, characterized in that the valve body is provided so as to be able to open and close the valve pipe opening.

6. The drainage system according to claim 5, characterized in that the valve pipe opening is located above the outlet side connection port.

7. The valve pipe has a canopy-shaped portion that is formed to slope from the downstream side to the upstream side as it extends from above downwards, The valve pipe opening is provided in the canopy-shaped portion, The valve body is pivotally supported at the upper end of the valve pipe opening and is capable of swinging at its lower end in a direction toward or away from the valve pipe opening. The drainage system according to claim 5, characterized in that a flow of water acts on the valve body in a direction from the downstream side toward the upstream side, causing the valve body to approach the valve seat provided at the opening end of the valve pipe opening.

8. The detection device has a detected part and a detection part capable of detecting the detected part that is within a predetermined detection range, with one of the detected part and the detection part provided on the valve body side and the other on the valve pipe side. The backflow suppression valve operates such that, when water flows onto the valve body in a direction from the downstream side toward the upstream side, at least a portion of the valve body moves into the inside of the overhang-shaped portion. The detected part and the detection part that is provided on the valve pipe side are provided on the canopy-shaped part, The drainage system according to claim 7, characterized in that the detected part and the detection part provided on the valve body side are provided in a portion that extends inside the valve pipe.

9. The drainage channel is A first channel that forms a drainage channel for normal use, A second channel, separate from the first channel, is formed to lead to a wastewater storage tank. It is equipped with, A flow path switching member provided in the middle of the drainage channel allows switching between a state in which water flows through the first channel and a state in which water flows through the second channel. The drainage system according to any one of claims 1 to 4, characterized in that the drainage manhole is located on the first flow path and downstream of the flow path switching member.

10. A drainage manhole body having a storage space capable of storing water, A backflow suppression valve is provided, which is located inside the drain manhole body and has a valve body that is displaceable in response to the flow of water, and a valve seat that receives the valve body, allowing water to flow in the forward direction from the upstream side to the downstream side and restricting water flow in the opposite direction to the forward direction. A detection device for detecting the operating state of the backflow suppression valve, It is equipped with, The drainage manhole body, The upstream side includes an inlet connection port to which piping is connected, The outlet connection port is connected to the downstream side via piping, Inside the storage space, a valve pipe connected to the inlet connection port, It has, The valve pipe has a valve pipe opening that opens toward the storage space, The valve seat is provided at the open end of the valve pipe opening, The valve body is provided so as to be able to open and close the valve pipe opening, The aforementioned detection device A detection unit provided on either the valve body side or the valve pipe side, A detection unit is provided on the valve body side and the other side of the valve pipe, and is capable of detecting the detected part that is within a predetermined detection range, It has, A drainage manhole characterized in that the valve body is displaced by the flow of water in the reverse direction, causing the detected part to come into the detection range of the detection part, thereby making the valve body detectable.

Images