Drainage abnormality detection system

Abstract

To realize a drainage abnormality detection system that enables residents to be aware of drainage abnormalities in rainwater drainage systems at an early stage.SOLUTION: A drainage abnormality detection system 50 is used for a rainwater drainage system 10 that comprises a drainage outlet 11 provided on a floor surface of an exterior floor and a drainage member 20 that is connected to an upper side of a downspout 40 on the outside of an exterior wall 102 of a building 1 and discharges rainwater from the drainage outlet to a lower side. The drainage abnormality detection system 50 comprises a detection device 51 that detects when a predetermined amount or more of rainwater has accumulated in the drainage member 20, and a reporting unit that notifies residents that an abnormality has occurred in the drainage of the rainwater drainage system 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a drainage anomaly detection system that detects drainage anomalies in storm water drainage facilities. [Background technology]

[0002] Conventionally, rainwater drainage systems have been known that drain rainwater from drains provided on the floor surface of an external floor that is placed outdoors, such as the rooftop floor of a building, a flat roof, a balcony, or a veranda. For example, in rainwater drainage systems, a drainage member such as a drain box is connected to the upper side of a vertical gutter placed on the outside of the exterior wall of a building, and rainwater from the drainage port on the floor surface flows downward inside this drainage member and is discharged from the lower side of the vertical gutter. Also, a structure has been conventionally known in which an overflow pipe is provided at the base of a waist wall erected around the external floor, and when a predetermined amount or more of rainwater accumulates on the external floor, the rainwater is discharged from the overflow pipe (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-43410 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, when a foreign object clogs the downpipe that constitutes the drainage path of the exterior floor, causing a drainage abnormality, it is difficult for residents in the building to notice the drainage abnormality. Therefore, there is a possibility that the drainage abnormality cannot be resolved early. In particular, in a situation where drainage is performed through the overflow pipe section as in the configuration described in Patent Document 1, there is a high possibility that heavy rain or a storm is occurring, and since residents cannot go outside, there is a high possibility that they will be late in noticing the drainage abnormality.

[0005] An object of the present disclosure is to realize a drainage anomaly detection system that can make residents aware of drainage anomalies in storm water drainage facilities at an early stage. [Means for solving the problem]

[0006] One aspect of the drainage anomaly detection system disclosed herein is a drainage anomaly detection system used in a rainwater drainage system that includes a drain outlet provided on the floor surface of an exterior floor, and a drainage member that is connected to the upper side of a downspout on the outside of the exterior wall of a building and allows rainwater from the drain outlet to flow downward, and includes a detection device that detects when more than a predetermined amount of rainwater has accumulated in the drainage member, and an alarm unit that alerts occupants that an abnormality has occurred in the drainage of the rainwater drainage system. Effect of the Invention

[0007] According to one aspect of the drainage anomaly detection system of the present disclosure, it is possible to detect when a predetermined amount or more of rainwater has accumulated in the drainage member connected to the upper side of the downspout and to alert the user via an alarm unit, thereby allowing residents to become aware of a drainage anomaly in the rainwater drainage equipment at an early stage. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a schematic configuration of a storm water drainage facility in which a drainage abnormality detection system according to an embodiment is used. [Diagram 2] 2 is a perspective view of the detection device-equipped drainage member taken out from FIG. 1 and seen from above. FIG. [Diagram 3] FIG. 3 is an exploded perspective view of the detection device-equipped drainage member shown in FIG. 2. [Figure 4] FIG. 3 is a side view of the drainage member with a detection device shown in FIG. 2. [Diagram 5] 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 6] 3 is a perspective view of the detection device-equipped drainage member shown in FIG. 2 with a lid removed, as viewed from below. FIG. [Figure 7] 6 is a view corresponding to FIG. 5 of a drainage member equipped with a detection device according to another embodiment of the present invention. [Figure 8]FIG. 11 is a perspective view showing a drainage member with a detection device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the drainage abnormality detection system according to the present disclosure will be described with reference to the drawings. The shapes, numbers, materials, etc. described below are examples for explanation and can be changed as appropriate depending on the specifications of the drainage abnormality detection system or the rainwater drainage facility. In the following, the same elements are given the same reference numerals in all the drawings. In the following, a case will be described in which the rainwater drainage facility using the drainage abnormality detection system drains rainwater from a balcony, which is an external floor of a building, but it may also be used to drain rainwater from other external floors other than balconies, such as rooftop floors, flat roofs, verandas, etc. of buildings.

[0010] An embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a rainwater drainage system 10 in which a drainage abnormality detection system 50 is used. As shown in FIG. 1, the rainwater drainage system 10 is used to drain rainwater from a balcony 101 of a building 1 such as an apartment building or a detached house having a balcony 101. The building 1 to which the rainwater drainage system 10 is applied includes the balcony 101 and a waist wall 103 erected at a corner portion of the balcony 101. The waist wall 103 forms a part of an exterior wall 102.

[0011] A drain outlet 11 is provided on the floor surface 101a of the balcony 101. A drain pipe 13 is connected to the exterior wall 102 so as to communicate with the drain outlet 11, and protrudes from the outer surface 102a of the exterior wall 102. The end of the drain pipe 13 protruding from the exterior wall 102 is provided with a bent portion 14 bent downward into a substantially L-shape. The drain pipe 13 may be configured as a straight pipe having a bent portion at the end protruding from the exterior wall 102, which is inserted into a horizontal hole in the exterior wall 102 so as to communicate with the drain outlet 11. The drain outlet 11 may also be provided with a floor-side drain or a strainer that suppresses the inflow of foreign matter.

[0012] The storm water drainage system 10 includes the drain outlet 11, the drain pipe 13, a drainage member 20 connected to the protruding end of the drain pipe 13, and a downspout 40.

[0013] The downspout 40 is disposed so as to extend vertically along the exterior wall 102 of the building 1, and is fixed to the exterior wall 102 by a connecting member 41. A drainage member 20 is connected to the upper end of the downspout 40 via a downspout-side drain 42. The drainage member 20 becomes a drainage member 18 with a detection device by having a detection device 51, which will be described later, attached to it. The detection device 51 constitutes a drainage abnormality detection system 50, which will be described later.

[0014] As will be described in detail later, the drainage member 20 is a catch basin including a cylindrical main body 21 with a rectangular cross section that has a bottom and an open top, and a lid 30 attached to the top end of the main body 21. An opening with a generally U-shaped cross section that is hollowed out on the inside is formed on the side of the main body 21 facing the outer wall 102, and the protruding end of the drain pipe 13, including the bent portion 14, is inserted into the inside of the main body 21 through this opening and connected to the main body 21. A downward extension 29 protrudes from the bottom end of the main body 21. A downspout 40 is connected to the downward extension 29 via a downspout-side drain 42.

[0015] The detection device 51 detects that an abnormality has occurred in the drainage in the downpipe 40 and that a predetermined amount or more of rainwater has accumulated in the drainage member 20. When the detection device 51 detects that a predetermined amount or more of rainwater has accumulated, it outputs a detection signal to a management monitor 70 (described below) inside the building 1. This allows residents to be made aware of a drainage abnormality in the rainwater drainage system 10 at an early stage, as described below, using the management monitor 70. The detection device 51 will be described in detail later.

[0016] The operation of the rainwater drainage system 10 during drainage will be described. Rainwater that falls on the balcony 101 of the building 1 is sent from the balcony 101 through the drain outlet 11 and drain pipe 13 to the inside of the drainage member 20. The rainwater flows downward inside the drainage member 20 and is sent to the downspout 40, flows downward inside the downspout 40 and is discharged from the bottom, and then is discharged to the drainage system side (not shown).

[0017] The drainage abnormality detection system 50 of the embodiment is used in the rainwater drainage facility 10 and detects drainage abnormalities in the rainwater drainage facility 10. The drainage abnormality detection system 50 includes a detection device 51 attached to the drainage member 20 and an alarm unit provided inside the building 1 to alarm the drainage abnormality.

[0018] The notification unit notifies residents in the building 1 that the above-mentioned drainage abnormality has occurred, on condition that a predetermined amount or more of rainwater has been accumulated in the drainage member 20. The notification unit may notify the date and time when the abnormality has occurred. The notification unit is, for example, the management monitor 70 installed indoors as shown in FIG. 1. The management monitor 70 has a display unit 71 that notifies the occurrence of the abnormality by using an image, text, or the like. For example, the display unit 71 may notify the occurrence of the drainage abnormality by displaying text such as "Drainage abnormality". The management monitor 70 also has a sound notification unit 72 that notifies the occurrence of the abnormality by using a sound. The sound notification unit 72 is, for example, a speaker. The sound notification unit 72 may read out the information displayed on the display unit 71.

[0019] The notification unit may be a mobile terminal owned by the resident. This allows the resident to notice the occurrence of a drainage abnormality even when he or she is not indoors. The notification unit may be configured to notify the manager of the building 1 in which the balcony is provided. The notification unit may also be configured to have a warning light and to notify the occurrence of a drainage abnormality by turning on or blinking the warning light.

[0020] The detection device-equipped drainage member 18 will be described with reference to Figs. 2 to 6. Fig. 2 is a perspective view of the detection device-equipped drainage member 18 taken out of Fig. 1 and seen from above. Fig. 3 is an exploded perspective view of the detection device-equipped drainage member 18. Fig. 4 is a side view of the detection device-equipped drainage member 18. Fig. 5 is a cross-sectional view taken along line AA in Fig. 2. Fig. 6 is a perspective view of the detection device-equipped drainage member 18 with the lid 30 taken out and seen from below.

[0021] As shown in Figs. 2 to 5, the drainage member 18 with a detector includes a drainage member 20 and a detector 51 (Figs. 5 and 6) attached to the drainage member 20. The drainage member 20 includes a cylindrical main body 21 having a generally rectangular cross section with an opening at the top end and chamfered portions at both left and right ends on the front surface S1 side, and a lid 30 attached to the top of the main body 21 and closing the opening of the main body 21. The lower end of the cylindrical portion 22 of the generally rectangular cross section of the main body 21 is closed by a bottom plate portion 28 (Fig. 5). The main body 21 and the lid 30 are each integrally formed of resin. In this specification, the side of the drainage member 20 away from the outer wall 102 is referred to as the front side, and the side facing the outer wall 102 is referred to as the back side. In addition, the right and left sides of the drainage member 20 when viewed from the front surface S1 side are referred to as the right side and the left side, respectively. In Figs. 1 and 2, the front side is indicated by an arrow F, and the back side is indicated by an arrow B.

[0022] 3, protrusions 24 protrude from both left and right ends of the upper end of the rear end plate 23 that forms the back surface S2 of the main body 21. Each protrusion 24 is formed with a mounting hole 24a for mounting to the exterior wall 102 of the building with a screw. Furthermore, locking holes 26, 27 for mounting the lid 30 are formed in the upper end of the rear end plate 23 below each protrusion 24 and in the upper ends of the left and right side plates 25, respectively.

[0023] An opening 23a is formed in a generally U-shaped recess at the upper end of the left-right middle part of the rear end plate 23. The protruding end of the drain pipe 13 is inserted into the inside of the main body 21 through the inside of this opening 23a.

[0024] 4 and 5, a circular hole 28a that penetrates vertically is formed in the bottom plate 28 of the main body 21. A substantially cylindrical downward extension 29 is formed at the opening periphery of the hole 28a in the bottom plate 28. A plurality of annular protrusions 29a are formed on the outer circumferential surface of the downward extension 29 to engage with an annular groove (not shown) formed on the inner surface of the downspout-side drain 42.

[0025] 2 and 6, the lid 30 has a tubular portion 31 with a generally rectangular cross section and chamfered portions on both the left and right ends of the front side, and a cover plate portion 32 that is connected to the lower end of the tubular portion 31 and covers the lower end opening of the tubular portion 31. The cover plate portion 32 is a plate with a generally polygonal pyramidal surface that protrudes downward, and a hole 33 is formed at the lower end that penetrates in the vertical direction. As a result, rainwater that splashes on the lid 30 flows into the main body portion 21 through the hole 33 and is discharged through the downspout 40.

[0026] 3 and 6, a fitting cylinder 35 is formed below the cylinder 31 of the lid 30. The front end, both left and right end portions, and both left and right end portions of the rear end portion of the fitting cylinder 35 are inserted inwardly from the cylinder 31. Then, as shown in FIG. 5, with the lower end of the cylinder 31 of the lid 30 abutting against the upper end of the main body 21, the fitting cylinder 35 of the lid 30 is fitted into the inner circumference of the upper end portion of the main body 21. In this state, the locking portions 36, 37 provided at multiple positions on the lower end of the outer periphery of the fitting cylinder 35 are locked into the locking holes 26, 27 formed at multiple positions on the main body 21, and the lid 30 is joined to the main body 21.

[0027] Before the lid 30 is attached to the upper part of the main body 21, the drainage member 20 is screwed to the exterior wall 102 of the building by screws passing through the mounting holes 24a of each protruding piece 24 at the upper part of the main body 21. In this state, the rear end plate 23 is in contact with the outer surface 102a of the exterior wall 102. Then, the lid 30 is fixed to the main body 21. As a result, the drainage member 20 is fixed to the exterior wall 102.

[0028] A downpipe-side drain 42 is fitted and fixed to the outer periphery of the downward extension 29 provided at the lower end of the drainage member 20. The downpipe-side drain 42 is a stepped cylinder in which a small diameter cylinder portion (not shown) is connected to the lower side of a large diameter cylinder portion 43 via a step portion 44. The upper end portion of the downpipe 40 is fitted onto the outside of the small diameter cylinder portion of the downpipe-side drain, and the upper end of the downpipe 40 abuts against the step portion 44. In this way, the downpipe 40 is connected to the drainage member 20 via the downpipe-side drain 42.

[0029] 5 and 6, the detection device 51 is fixed by adhesive or the like to the left-right middle part of the inner surface of the rear end of the fitting tube portion 35 of the lid 30. The detection device 51 is a water detection sensor that detects the presence or absence of water that is in contact with the detection device 51 or within a predetermined distance. For example, the water detection sensor is a capacitance type sensor. The capacitance type sensor is a sensor in which the closer the detection target object is in the detection space, the higher the capacitance value becomes, and the sensor outputs a detection signal based on the capacitance value.

[0030] The water detection sensor may also be configured to include two metal wires connected to a power circuit and an insulator sandwiched between the two metal wires, and detect contact with water by measuring a change in electrical resistance between the two metal wires. In this way, the detection device 51 detects that a predetermined amount of rainwater or more corresponding to the height position of the detection device 51 has accumulated in the drainage member 20 by detecting contact with water or approaching within a predetermined distance.

[0031] The detection device 51 may be configured to detect that a predetermined amount of rainwater has accumulated in the drainage member 20 by contacting or approaching the detection device 51 when the height of the rainwater accumulated inside the drainage member 20 reaches or exceeds the height of the upper end of the main body 21 shown by line P in Fig. 5. At this time, the detection device 51 can detect that there is a high possibility that the rainwater will overflow from between the upper end of the main body 21 and the lid 30. In such a drainage member 20, the accumulation of rainwater is detected when there is a high possibility that the rainwater cannot be completely drained, so that the detection device 51 can be prevented from operating excessively frequently.

[0032] In addition, in this example, since the detection device 51 is fixed to the inner surface of the lid 30, even if rainwater flows into the drainage member 20 through the drain pipe 13 or the hole 33 of the lid 30 during normal operation when there is no drainage abnormality, the water does not come into contact with the detection device 51, thereby preventing erroneous detection.

[0033] The detection device 51 and the notification unit such as the management monitor 70 are connected by a signal wire 74. As shown in FIG. 1, the middle part of the signal wire 74 is laid on the inner surface of the drain pipe 13 inside the outer wall 102. For example, the signal wire 74 can be installed from near the detection device 51 on the outside of the drain pipe 13, through a hole (not shown) formed in the upper part of the drain pipe 13, into the drain pipe 13, and along the inner surface of the drain pipe 13. This can reduce the number of holes in the outer wall 102 dedicated to passing the signal wire 74 through. The signal wire 74 can be covered with a waterproof cover or a waterproof tube. When rainwater is detected by the detection device 51, a detection signal indicating the detection is output to the notification unit through the signal wire 74.

[0034] As shown in Figs. 2, 3 and 5, a power supply unit 80 is provided on the upper surface of the cover plate 32. The power supply unit 80 may be, for example, a battery unit including a primary battery or a secondary battery such as a dry cell housed in a waterproof box, or a solar cell having a solar cell panel and generating power from sunlight. A power line 81 is led out from the power supply unit 80, and the power line 81 is guided to the underside of the cover plate 32 through a hole 33 in the cover plate 32 and connected to the detection device 51. This allows the detection device 51 to be operated without extending and connecting a power line connected to an external AC power source from inside the building 1 to the detection device 51. It is also possible to configure the detection device 51 to be powered by extending and connecting a power line connected to an external AC power source from inside the building 1 to the detection device 51 without attaching a power supply unit to the cover 30.

[0035] Furthermore, the transmission of a signal from the detection device 51 to a notification unit such as the management monitor 70 may be performed by wireless communication such as a wireless LAN.

[0036] When the rainwater drainage system 10 is in use, if the drainage in the downspout 40 is obstructed during rainfall and a drainage abnormality occurs, the rainwater accumulates in the drainage member 20 so that the accumulation height gradually increases. When the rainwater accumulated in the drainage member 20 comes into contact with the detection device 51 or approaches within a predetermined distance, a detection signal is output from the detection device 51 to the notification unit. For example, in FIG. 1, it is shown that a drainage abnormality has occurred due to a foreign object clogging the sandy area G shown in the downspout 40.

[0037] When a detection signal is output from the detection device 51 to the notification unit, the notification unit notifies the resident of a drainage abnormality in the storm water drainage system 10. In this way, the drainage abnormality detection system 50 can make the resident aware of a drainage abnormality in the storm water drainage system 10 at an early stage. This makes it possible to prompt the resident to resolve the drainage abnormality at an early stage, for example by cleaning or maintaining the downspout 40, making it easier to resolve the drainage abnormality at an early stage. When the drainage abnormality is resolved, the detection device 51 no longer outputs a detection signal, so the resident can confirm through the notification unit that the drainage abnormality has been resolved.

[0038] On the other hand, as a comparative example, it is also conceivable to provide a detection means for detecting when a certain amount of water has accumulated on the floor surface 101a of the balcony 101. For example, it is conceivable to use a water detection sensor of a capacitance type or the like as the detection means to detect that the water level on the floor surface 101a is equal to or higher than a predetermined level. However, in this case, when a normal amount of rain falls, the detection means is likely to be splashed with rainwater, resulting in false detection. In addition, it is conceivable to use a water level gauge such as a float switch placed on the floor surface as the above detection means, but in that case, since the detection means becomes large, it is likely to interfere with the movement of residents on normal sunny days. In addition, there is a possibility that the detection means will be blown away during a storm, and will not be able to perform the rainwater detection function. According to the embodiment, all of these inconveniences can be prevented.

[0039] FIG. 7 is a view corresponding to FIG. 5 of a drainage member 18a with a detection device according to another embodiment. In the configuration of this example, the detection device 51a is a float-type sensor arranged inside the main body 21. The float-type sensor has a float body 96 that can move in the vertical direction along the guide shaft 90, and a detection signal is output when the float body 96 moves upward to a predetermined height or more. The float-type sensor is configured similarly to a so-called float switch. Specifically, the guide shaft 90 is tubular and extends in the vertical direction. A disk-shaped upper stopper 91 is fixed to the upper end of the guide shaft 90, and a disk-shaped lower stopper 92 is fixed to the lower end of the guide shaft. The upper stopper 91 is fixed to the cover plate 32 with the lower end of the tube portion 38, which protrudes downward from the opening periphery of the hole 33 of the cover plate 32, inserted into the upper surface. As a result, the guide shaft 90 is fixed to the cover plate 32 so as to hang down along the vertical direction.

[0040] The float body 96 is a floating member that is fitted to the guide shaft 90 with a gap therebetween and is movable in the vertical direction and can float on water. For example, the float body 96 is an annular body formed of resin or the like and having a cavity inside. The vertical movement of the float body 96 is restricted by an upper stopper 91 and a lower stopper 92. An annular magnet (not shown) is provided inside the float body 96 so as to surround the guide shaft 90. FIG. 9 shows that the drainage member 20 is virtually filled with water up to the vertical middle position indicated by the two-dot chain line L, and the float body 96 is located at the vertical middle of the guide shaft 90 so as to float on the water.

[0041] A reed switch 94 is disposed inside the guide shaft 90 at a predetermined position in the vertical direction, such as the upper end of the guide shaft 90. When the magnet in the float body 96 approaches the reed switch 94, the reed switch 94 is turned on, and a detection signal is output from an electric circuit (not shown) for detecting rainwater via the reed switch 94. On the other hand, when the magnet is separated from the reed switch 94, the reed switch 94 is turned off, and no detection signal is output from the electric circuit. As a result, the float type sensor can detect that the float body 96 has risen to a predetermined height in the drainage member 20 by outputting the detection signal. Therefore, the float type sensor detects that a drainage abnormality has occurred in the rainwater drainage system 10 and that a predetermined amount or more of rainwater has accumulated in the drainage member 20. When the detection signal is output from the detection device 51a to a notification unit such as a management monitor, the notification unit notifies the resident of the drainage abnormality. This also allows the resident to notice the drainage abnormality in the rainwater drainage system 10 at an early stage, as in the configurations of Figures 1 to 8. In this example, other configurations and operations are similar to those in the configurations of FIGS.

[0042] Fig. 8 is a perspective view showing a drainage member 18b with a detection device according to another embodiment. In the configuration of this example, as shown in Fig. 8, the drainage member 20a constituting the drainage member 18b with a detection device is a drainage member with a branch pipe, which is called a rounded corner cheese cap or a decorative elbow. The drainage member 20a has a rear end plate 111 of a polygonal cylindrical tube 110 from which a branch pipe 112 is led out in a substantially horizontal direction. The branch pipe 112 may be configured to protrude obliquely upward from the rear end plate 111 so as to face slightly upward.

[0043] A lid 30a having a central hole is attached to the upper end of the tube portion 110. The protruding end of the drain pipe 13 protruding from the outer surface 102a of the outer wall 102 in a substantially horizontal direction is connected to the tip of the branch pipe 112, which is the outer wall end. When the branch pipe 112 is inclined obliquely upward, the protruding end of the drain pipe 13 may be configured to protrude obliquely downward from the outer surface 102a according to the inclination angle. The detection device is attached, for example, to the inner surface of the lid 30a. In this example, the other configurations and functions are the same as those of Figures 1 to 8. In this example, the float-type sensor shown in Figure 7 can also be provided as a detection device inside the drain member 20a. [Explanation of symbols]

[0044] 1 building, 10 storm water drainage equipment, 11 drain outlet, 13 drain pipe, 14 bent portion, 18, 18a, 18b drainage member with detection device, 20, 20a drainage member, 21 main body portion, 22 tube portion, 23 rear end plate portion, 23a opening, 24 protruding piece portion, 24a mounting hole, 25 side plate portion, 26, 27 locking hole, 28 bottom plate portion, 28a hole, 29 downward extension portion, 29a annular protrusion portion, 30, 30a lid, 31 tube portion, 32 cover plate portion, 33 hole, 35 fitting tube portion, 36, 37 locking portion, 38 tube portion, 40 downspout, 41 connecting member, 42 downspout side drain, 43 large diameter tube portion, 44 step portion, 50 Drainage abnormality detection system, 51, 51a detection device, 70 management monitor, 71 display unit, 72 sound alarm unit, 74 signal wiring, 80 power supply unit, 81 power line, 90 guide shaft, 91 upper stopper, 92 lower stopper, 94 reed switch, 96 float body, 101 balcony, 101a floor surface, 102 outer wall, 102a outer surface, 103 waist wall, 110 tubular portion, 111 rear end plate portion, 112 branch pipe.

Claims

1. A drainage abnormality detection system for use in a rainwater drainage system having a drain outlet provided on the floor surface of an exterior floor and a drain member connected to the upper side of a downspout on the outside of an exterior wall of a building and draining rainwater from the drain outlet downward, A detection device that detects whether a predetermined amount of rainwater has accumulated in the drainage member; A notification unit that notifies a resident that an abnormality has occurred in the drainage of the rainwater drainage system; A drainage abnormality detection system.

2. In the drainage abnormality detection system according to claim 1, The drainage member includes a cylindrical main body having an opening at an upper end and a lid attached to the upper end of the main body, The detection device is attached to the inner surface of the lid and detects that the rainwater has accumulated in the drainage member by detecting contact with water or approaching within a predetermined distance. Drainage abnormality detection system.

3. In the drainage abnormality detection system according to claim 1, The detection device is disposed inside the drainage member, includes a float body that is movable vertically along a guide shaft, and detects that the float body has moved upward to a predetermined height or more, thereby detecting that the predetermined amount or more of rainwater has accumulated in the drainage member. Drainage abnormality detection system.

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