JPH0151945B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a novel rainfall intensity detection device. Specifically, it is possible to accurately detect rainfall intensity, and in particular, to accurately detect when a predetermined rainfall intensity level has been reached. The present invention relates to a novel rainfall intensity detection device suitable for use in an alarm device, etc. that issues a necessary warning when it detects that the rainfall intensity has been reached.

Background technology and its problems It is necessary to detect or measure rainfall intensity as accurately as possible from the viewpoint of flood prevention and ensuring traffic safety. Roads in mountainous areas in particular are in a state where extremely dangerous situations such as landslides are likely to occur due to rainfall, and for this reason, the intensity of rainfall is constantly monitored on roads with a high degree of risk. When the rainfall intensity reaches dangerous levels, roads are closed. The level of such dangerous rainfall intensity is generally set to an appropriate value for each road based on experience.

Incidentally, such detection or measurement of rainfall intensity is generally performed in an unattended environment. In other words, a device that detects or measures rainfall intensity (hereinafter simply referred to as a "detection device") is installed on or near the road in question, but the control center that ultimately issues road traffic regulation commands is responsible for determining whether the detection device is They are often located far away from where they are installed, and the control center issues regulation commands based on the signals sent from the detection devices.

In this way, rainfall intensity is a decisive factor in carrying out acts that have a great impact on social activities, such as regulating road traffic, so there are many ways to detect or measure it. Extremely high precision is required.

However, conventional detection or measurement of rainfall intensity is not always accurate.

FIG. 1 shows a conventional rainfall intensity detection device. In the figure, a indicates a water tank, and the water tank a
A drain port b is provided at the lowest part of the drain port b. c is a roughly funnel-shaped rain collector with a large opening d of a certain area formed at the top and a water injection pipe e at the bottom, and the water injection port f at the lower end of the water injection pipe e is directed into the water tank a. It is being g is a water level detection section provided in the water tank a, and is composed of a large number of reed switches and one float. That is, h is a gauge port, and a large number of reed switches i ₁ , i _{2 .} . . are buried at equal intervals in the vertical direction inside the gauge port h. The arrangement interval of each of these reed switches i ₁ , i _{2 .} . . directly affects the detection accuracy of the water level k of rainwater j, and in order to increase the detection accuracy, it is necessary to narrow the arrangement interval.

Each reed switch i ₁ , i ₂ . . . has a movable contact l ₁ , l ₂ . o indicates an alarm device such as a buzzer or lamp. P is a ring-shaped float that is fitted on the outside of the gauge port h with a slight gap so as to be able to move up and down, and magnets q and q are embedded therein. This float p is raised or lowered along the gauge port h as the water level k of rainwater j stored in the water tank a rises or falls. Although not shown in the figure, resistors with different resistance values are connected between each reed switch i ₁ , i _{2 .} . . and the lead wire m, and the detection circuit n detects which reed switch i ₁ , i ₂ . . . have closed their contacts by measuring the voltage value, and the water level k of rainwater j in the water tank a is detected. Further, the alarm o is a contact l ₄ of a reed switch i ₄ installed at a preset warning water level r among reed switches i ₁ , i ₂ .
The circuit is configured to operate when the That is, the warning water level r is the dangerous level of rainfall intensity when the rainwater j has accumulated up to this water level.

When the rainwater collected by the rain collector c is injected into the water tank a, the rainwater is drained out of the tank from the drain port b at the bottom of the water tank a. Then, the flow rate s of rainwater injected from the rain collector c
When the flow rate t is smaller than the flow rate t discharged from the drain port b, rainwater does not accumulate in the water tank a, and therefore the float p remains located at the bottom of the gauge port h. Reed switch i ₁ , i ₂
......, its l ₁ , l ₂ ... will never close.

Moreover, when the inflow s of rainwater flowing in from the rain collector c is larger than the flow rate t draining out from the drain outlet b, rainwater j is accumulated in the water tank a, and the water level k is gradually raised. Along with this, the float p is also gradually raised. When the reed switches i ₁ , i ₂ . . . come almost right next to the reed switch p, the float p also closes its contacts l ₁ , l _{2 .} . . by the magnetic force of the magnets q, q, and the detection circuit n
detects the voltage caused by current flowing through a predetermined resistor connected to the reed switch whose contacts are closed, thereby detecting the current water level k of rainwater in the water tank a. The detection of the water level k of the rainwater j is detected as the level of rainfall intensity at that point in time. In this way, the float p is raised or lowered as the water level k rises or falls, and when the reed switch i ₄ closes its contact l ₄ , the alarm o is activated, indicating that the current rainfall intensity has reached the warning level. I can report things.

Furthermore, even if the rainfall intensity reaches the predetermined warning level,
Traffic restrictions are not immediately implemented, and the rainfall intensity reaches a dangerous state only after it has continued for a certain period of time, such as 10 or 20 minutes. It is judged as such.

In this way, the conventional rainfall intensity detection device shown in FIG. 1 detects rainfall intensity, but it cannot be said that the detection is performed accurately. This is because the warning water level for rainfall intensity is taken as the water level of rainwater in water tank a, and that water level is replaced by the unstable current position of float p.
Furthermore, it is an indirect detection means that detects by the response operation of reed switches i ₁ , i ₂ , . . . located close to the current position of the float p, and directly detects the amount of rainwater. This is because it is not a thing. This is because the raising or lowering operation of the float p fluctuates greatly in response to fluctuations in the water level k, making it extremely difficult to accurately follow minute changes in the water level.

FIG. 2 shows an example of fluctuations in the water level of rainwater stored in the water tank a, and r in the figure indicates the above-mentioned warning water level. If the water level k of rainwater j in the water tank a rises linearly as shown in graph u, and the amount of rainfall changes so that it settles at a constant water level even when it exceeds the alert level r, then The float p can stably hold its current position, and the reed switches i ₁ , i _{2 .} . . driven by the float p will also operate correctly.
The actual water level transition is not linear like this,
As shown in graph v, the water level changes in a curved manner, and the rate of rise of the water level decreases just before reaching the water level corresponding to a specific rainfall intensity. However, it is extremely difficult for the float p to accurately follow such minute rises in the water level, and the float p rises after sinking below the rainwater water level k to some extent, that is, with a delay in the rise in the water level. In other words, the responsiveness is poor. As mentioned above, in detecting rainfall intensity, the level of rainfall intensity as well as the duration of the rainfall intensity at that level are significant, so this response delay of float p is a serious problem. be.

Furthermore, in many cases, the intensity of rainfall changes from moment to moment, and therefore the water level of rainwater in the water tank a changes by repeatedly rising and falling as shown in the graph w. Therefore, as mentioned above, if the float p cannot accurately follow changes in the water level, for example, the reed switch _i4 may be activated as early as the time x when the water level has not actually reached the warning water level r. It is also possible that the reed switch _i4 remains in operation even at the time y when the water level has already fallen below the warning water level r. If such a malfunction occurs, the detection circuit _n will cause the detection circuit n to
Even if the duration is T ₂ , it will be detected.

In addition, there are conventional rainfall intensity detection devices, such as those that detect rainfall intensity by differentiating the rainfall signal from overturned balls, and those that detect rainfall intensity by measuring the weight of rainwater. Both had practical problems, such as complicated equipment and extremely high prices.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and is capable of accurately monitoring changes in rainfall intensity that change from moment to moment, and when the rainfall intensity reaches a predetermined level. It is an object of the present invention to provide a low-cost rainfall intensity detection device that can immediately detect rainfall intensity when the rain occurs, and has a relatively simple configuration.

Summary of the Invention In order to achieve the above object, the rainfall intensity detection device of the present invention includes: a rainfall collector that receives rainwater falling on an area having a certain area; a water storage tank that collects the rainwater collected by the rainwater collector; a lower drain provided at the bottom of the water tank; an upper drain provided above the water tank at a height corresponding to a predetermined rainfall intensity; and receiving rainwater discharged from the upper drain; When the weight of the stored water exceeds a certain standard amount, the container tilts and becomes overturned.If the container falls over, the container consists of a measuring means that measures the duration of the overturning state, and the overturning container is a box with an open top. The bottom surface is a proximal inclined surface that is inclined to become higher as it goes from the end on the tilting center side to the center side, and a base side slope that becomes higher as it goes from the tilting end to the center side. A small hole for water drainage is formed in the tilting end side of the tipping cell, and when the tipping cell falls, the proximal inclined surface is the proximal end. According to the present invention, it is possible to accurately detect when the rainfall intensity has reached a preset level. It becomes possible to detect.

Embodiment Below, details of the rainfall intensity detection device will be explained according to an embodiment shown in the accompanying drawings.

FIG. 3 to FIG. 6 show an example of the implementation of the rainfall intensity detection device of the present invention.

1 indicates the base, and 2 indicates the case. Reference numeral 3 designates a cylindrical main water tank having an opening 4 at the top and arranged vertically, and is fixed to and supported by mounting legs 5, 5, . . . on the base 1. Reference numeral 6 denotes a sub-water tank provided within the main water tank 3, and is attached to the main water tank 3 by appropriate means. The sub water tank 6 has an opening 7 at the top and is arranged vertically, and the sub water storage chamber 8 and the main water storage chamber 9 of the main water tank 3 are communicated with each other by a communication pipe 10 having a small diameter. Communication pipe 1
The opening 11 at one end of the water tank 6 is connected to a communication port 13 formed in the bottom plate 12 of the sub-water tank 6, and the communication pipe 10 has a substantially circular bent shape when viewed from above and below, as shown in FIG. It is said that 14 is the communication pipe 1
This is the opening at the other end of 0.

15 has a large opening 1 with a constant area on the top surface.
It is a rain collector with 17 parts and a water injection pipe 17 at the bottom.
are integrally formed, and the water injection pipe 17 is directed into the sub-water storage chamber 8 of the sub-water tank 6. Therefore, the rainwater collected by the rain collector 15 flows into the subwater storage chamber 8 of the subwater tank 6 through the water injection pipe 17, and the rainwater that flows into the subwater storage chamber 8 flows through the communication pipe 10. The water then flows out into the main water storage chamber 9 of the main water tank 3.

The main water tank 3 is provided with drainage ports at its bottom and top. 18 is the lower drain port,
It is provided at the lowest part of the outer peripheral wall 19 of the main water tank 3, and a lower drain pipe 21 is connected to the lower drain port 18. The discharge port 22 of the lower drain pipe 21 is bent downward and directed below the base 1. Reference numeral 23 denotes an upper drain port penetrating the outer peripheral wall 19 of the main water tank 3, and is provided at a position opposite to the lower drain port 18 across the center of the water tank 3. is connected to an upper drain pipe 24. The discharge port 25 of the upper drain pipe 24 is bent downward and directed into the water receiving chamber of the overturning cell, which will be described later. Therefore, the rainwater that has flowed into the main water storage chamber 9 of the main water tank 3 is drained out of the tank only from the lower drain port 18 when the flow rate of the rainwater flowing in is smaller than the flow rate that can be discharged from the lower drain port 18. Teyuki,
When the flow rate of rainwater flowing in is greater than the flow rate that can be discharged from the lower drain port 18, a part of the rainwater is discharged to the outside of the lower drain port 18 and the other part is stored in the main water tank 3. It gradually accumulates in room 9. And the water level 27 of the accumulated rainwater 26
When the height becomes higher than the height at which the upper drain port 23 is formed, the rainwater 26 is discharged from the upper drain port 23 to the outside of the tank, that is, into the water receiving chamber of the overturning basin described later.

By the way, the position of the upper drain port 23 formed above the main water tank 3 has an important meaning. This is because the rainwater 26 is discharged from this upper drain 23 when the rainfall intensity reaches a certain dangerous level, and therefore the upper drain is discharged based on the level set as the dangerous rainfall intensity. It is necessary to determine the formation position of the mouth 23. Specifically, main water tank 3
It is set based on various factors such as the cross-sectional area of the drain port 18 and the drainage capacity of the lower drain port 18. In this example, the rainfall intensity to be detected is set to 50 mm/H. Therefore, when the rainwater 26 is discharged from the upper drain 23, the rainfall intensity is 50mm/
This means that H has been reached. and,
When drainage starts from the upper drain port 23, the flow rate of rainwater discharged from the lower drain port 18 becomes constant.

28 is the above-mentioned tipping box, and the top surface is the opening 2.
It has a substantially elongated box shape with a 9-shape, and one end, that is, the left end in FIG. 3, is rotatably supported. Hereinafter, this end will be referred to as the proximal end. 30,3
0 is a substantially trapezoidal side plate, and the edges of the side plates 30, 30 on the tilting end side, that is, the right edge in FIG. 3 (hereinafter referred to as the leading edge) move toward the left side in the figure as you go up. A front plate 31 is provided between the leading edges of the front plate 31, and a rear plate 32 is provided at a position slightly to the right from the left end of the side plates 30, 30 in FIG. The part behind the rear plate 32 has a weight balance mounting part 33,
It is said to be 33. The bottom plate 34 is bent in a substantially F-shape when viewed from the side, and the bottom plate 34 bent in the F-shape forms two inclined bottom surfaces 35.
and 36 are formed. Therefore, the portion on the bottom surface 35 on the proximal end side will be referred to as the proximal side water receiving portion 37, and the portion on the bottom surface 36 on the distal side will be referred to as the distal side water receiving portion 38.
A water drain hole 39 is formed below the front plate 31.

Balance rods 41, 41 each having an appropriate weight 40 attached to one end are attached to the weight balance mounting pieces 33, 33, and a shaft 42 is welded to the lower edge of the weight balance mounting pieces 33, 33. It is fixed by appropriate means. axis 4
Both ends of 2 are bearing pieces 4 fixed on the base 1.
3 and 43 so as to be rotatable.

Reference numeral 44 denotes a magnet mounting portion provided on the lower surface of the bottom surface 35 of the proximal water receiving portion 37 of the tipping device 28. A magnet 45 is buried therein. A reed switch 47 is provided on the base 1 via a switch attachment piece 46 at a position corresponding to the magnet attachment part 44, so that the reed switch 47 approaches the magnet 45 when the overturning rack 28 is overturned. It is being done.

48 is the fall stopper of 28, 49 is the stopper of balance rod 41, 50 is the base stand 1
A drain port 51 opened to is a drain channel provided below the drain port 50. The overturning basin 28 is maintained in the upward position shown by the solid line in FIG. 3 until rainwater exceeding a certain weight is accumulated in its water receiving portion 37 or 38. Specifically, this is a state in which the inclined bottom surface 35 on the base end side becomes higher from the base end toward the center, and this state will be referred to as a normal state.

Note that the discharge port 25 of the upper drain pipe 24 provided above the main water tank 3 is directed toward the proximal water receiving portion 37 of the overturning basin 28, and the overturning basin 28 is shown by a solid line in FIG. rainwater drained from the upper drain pipe 24 is drained from the proximal side receiver of the overturning pipe 28 both when it is in the upward position, and also when it is in the state shown by the two-dot chain line in FIG. It is designed to flow into a water section 37.

When rainwater is discharged from the upper drain port 23 of the main water tank 3, the discharged rainwater accumulates in the proximal water receiving part 37 of the overturning tank 28, gradually increasing its weight until it remains constant. When the value of , the relationship between the left and right weights in FIG.
In the figure, the state where the left side is heavier changes to the state where the right side is heavier. As a result, the overturning tray 28 is tilted about the shaft 42 as the center of tilting so that its tip side is directed downward, resulting in an overturning state (the state shown by the two-dot chain line in FIG. 3). When the overturning block 28 is overturned, the bottom surface 35 of the proximal water receiving portion 37 is inclined further downward than the horizontal line H, so that the proximal water receiving portion 37
The rainwater collected in
Moved to 8. The rainwater transferred to the tip side water receiving section 38 is prevented from flowing out by the front plate 31, so it temporarily accumulates in the tip side water receiving section 38, and some of the rainwater falls over. When subjected to an impact or the like, it flows out of the distal end side water receiving part 38 over the front plate 31, and the other part gradually flows out through the drainage small hole 39. If the rainwater continues to be discharged from the upper drainage port 23 while the overturning block 28 is overturned, the discharged rainwater will immediately fall onto the bottom surface 35 of the proximal water receiving section 37. The rainwater flows into the tip side water receiving part 38, and therefore, the overturning bucket 28 always accumulates rainwater of a certain weight or more in the tip side water receiving part 38, and maintains the overturned state. When the rainwater discharge from the upper drainage port 23 is stopped after the overturning bowl 28 is overturned, the weight of the rainwater inside the tip side water receiving part 38 gradually decreases until it reaches a certain weight or less. The fall 28 is caused by a change in the relationship between the left and right weights in FIG.
Since the first side becomes heavier, it is restored to the upward position.

Rainwater runoff from the overturning stage 28 is collected from the base 1
The water is discharged into a drainage channel 51 through a drainage port 50 provided in the drain port 50 .

A detection circuit 52 has a detection signal input terminal connected to the reed switch 47 via a lead wire 53, and receives an electrical signal output when the reed switch 47 closes its contact 54. An appropriate timer circuit 55 counts the time period during which the electrical signal continues to be input to the detection circuit 52, that is, the signal input duration time. Then, when the measured signal input duration reaches a preset predetermined time, for example, one minute, an operation command is output to the alarm device 56.

Therefore, when the overturning platform 28 is overturned, the magnet mounting portion 46 provided on the bottom plate 34 of the overturning platform 28 comes to cover the reed switch 47, and the reed switch 47 is held there by the magnetic force of the magnet 45. Contacts 54 are closed. Then,
An electrical signal from the reed switch 47 is input to the detection circuit 52, and a command is issued from the detection circuit 52 to the timer circuit 55 to count the signal input duration time. Then, when the counted signal input duration time reaches a preset time, an operation command is output to the alarm device 56, and the alarm device 56 performs an alarm operation.

In the above embodiment, the reed switch 47 is used as the switch for detecting the overturning state of the overturning platform 28, but the switch is not limited to reed switches, and may be a micro switch, a photo switch, or any other type of switch. members can be used.

In addition, as a means for balancing the overturning platform 28, a weight balance was provided on the proximal end of the overturning platform 28, but this is not limited to weight balance; for example, a tension spring with good response accuracy may be used. Well, in short, I fall down 28
It can be used as long as it can be balanced so that it will tip over when more than a certain weight of rainwater accumulates inside.

Furthermore, in the embodiment described above, the water tank is divided into the main water tank 3 and the sub water tank 6, and both of the water tanks 3 and
The space between the water storage chambers 9 and 8 of 6 and 6 is shown connected by a communication pipe 10, but this is because the water level 27 in the water storage tank is increased by the falling action of rainwater flowing in from the rain collector 15. Preventing drastic fluctuations,
This is a configuration for statically maintaining the water level of rainwater discharged from the upper drainage port 23, and is not necessarily required in the device of the present invention.

Further, as the alarm 56, a buzzer, a lamp, etc. are used, but depending on the case, it is also possible to use a pen recorder in place of or together with these alarms.

Next, the operation process of the above-mentioned rainfall intensity detection device will be explained.

As an example, a case will be described in which the rainfall intensity is detected when the rainfall intensity reaches 50 mm/H.

Rainwater falling over a certain area is collected into a main water tank 3.
This is a rain collector 1 with an opening 16 of constant area.
5 receives rainwater and collects the rainwater into the main water storage chamber 9 of the main water tank 3 via the sub water tank 6.

During normal rainfall, that is, when the rainfall intensity has not reached a predetermined level (50 mm/H or higher), the rainwater collected in the water tank 3 is drained from the lower drain port 18 provided at the bottom of the water tank to the tank. Expelled outside.

When the rainfall intensity remains at a substantially constant level and is less than the predetermined level of 50 mm/H, the water level 27 in the water tank 3 remains substantially constant. This is because the flow rate of rainwater flowing into the water tank 3 from the rain collector 15 and the flow rate of rainwater discharged from the lower drain port 18 of the water tank 3 are in equilibrium.

When the rainfall intensity exceeds the specified level of 50mm/H,
The water level 27 in the water tank 3 is raised and if that level of rainfall intensity is sustained, the water level 27 in the water tank 3 is raised.
reaches the height at which the upper drain port 23 is provided, and rainwater is also discharged from the upper drain port 23 to the outside of the tank.

Rainwater discharged from the upper drainage port 23 is received by the overturning basin 28. The overturning basin 28 overturns when more than a certain weight of rainwater is accumulated, and the accumulated rainwater is gradually discharged to the outside through the drain hole 39. When the overturning stool 28 is overturned, the timer circuit 55 receives a command from the detection circuit 52 and counts the duration of the overturned state. This means that when the reed switch 4 is turned over, the reed switch 4
7 closes its contact 54, and this reed switch 4
7, an electrical signal informing the detection circuit 52 of the falling state is input, and together with the input of this electrical signal, the timer circuit 55 starts counting time.

When the overturned container 28 continues to be drained from the upper drain 23 in the overturned state, the overturned container 28 remains in the overturned state without being restored. Furthermore, when the rainwater stops draining from the upper drain 23 while the overturning basin 28 is in an overturned state, the overturning basin 28 is eventually restored to its original state without overturning. and falls down 28
When this is restored, no electrical signal is input to the detection circuit 52, and the time counting by the timer circuit 55 also ends, and the time counted by the timer circuit 55 is returned to zero.

When the time counted by the timer circuit 55 reaches a predetermined time, for example, one minute, the alarm 5
6 works. The activation of the alarm 56 means that the rainfall intensity has reached a predetermined level, 50 mm/H in this embodiment, and that this level has been sustained for at least one minute. It is to make it known.

In this way, a predetermined level of rainfall intensity is detected along with a required duration of the predetermined level.

In addition, in the embodiment described above, the water tank 3
Although there is only one upper drain port provided above, a plurality of upper drain ports may be provided. For example, in FIG. 3, another upper drain port is formed on the side of the main water tank 3 at a different height from the height where the upper drain port 23 is provided, and water is drained from the other drain port. By providing separate overturning basins to catch rainwater, it is possible to set two or more different levels of rainfall intensity and to separately detect whether or not the set level has been reached.

For example, in FIG. 3, the upper drain port 23
At a height different from the height where the upper drain port 23 is provided, other drain ports are provided that are vertically aligned approximately in a straight line with the upper drain port 23, and when in use, among the multiple drain ports, By leaving only one drain port open and closing the other drain ports, it is possible to freely select and detect the desired level of rain intensity using a single rainfall intensity detection device. can.

Effects of the Invention As is clear from the above description, the rainfall intensity detection device of the present invention includes a rainfall collector that receives rainwater falling on an area having a certain area, and a rainwater collector that collects rainwater that falls on an area having a certain area. A water storage tank for collecting water, a lower drainage port provided at the bottom of the water storage tank, an upper drainage port provided above the water storage tank at a height corresponding to a predetermined rainfall intensity, and water discharged from the upper drainage port. If the weight of the accumulated water exceeds a certain standard amount, the container will tilt and fall over.In the event of a fall, the overturning cell will be in a state of overturning. It is a box with an opening, and its bottom surface has a proximal inclined surface that is sloped so that it becomes higher as it goes from the end on the tilting center side toward the center, and a base side slope that becomes higher as it goes from the tilting end toward the center. It consists of two sloping surfaces, one on the tilting end side which is tilted higher, and a small hole for draining water is formed on the tilting end side of the overturning basin, and when the overturning basin falls, the tipping side slopes on the base end side. The device is characterized in that the inclined surface can be tilted so that it becomes lower as it goes from the base end to the center. Therefore, according to the present invention, the device can be constructed at a low cost, and in particular, when the overturning container is in an overturned state, the bottom surface of the water receiving portion on the proximal end thereof slopes downward toward the distal end. Therefore, regardless of the amount of rainwater, rainwater can be stored in the water receiving part on the tip side, and the center of gravity of the tipping basket can be kept on the tip side, making it possible to maintain the tipped state. Therefore, even if the rainfall intensity changes minutely, and even slightly at a level just below the predetermined rainfall intensity, it is possible to continue to accurately monitor the minute changes in rainfall intensity, and even if the rainfall intensity is slightly above the predetermined rainfall intensity, When the rainfall intensity reaches the predetermined rainfall intensity, it can be properly detected that the predetermined rainfall intensity has been reached, so that the rainfall intensity can be properly detected.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing an example of a conventional rainfall intensity detection device, and Figure 2 shows the change in water level in the water tank and the situation of rainfall intensity detection when using the rainfall intensity detection device shown in Figure 1. The graphs shown in FIGS. 3 to 6 show an example of the implementation of the rainfall intensity detection device of the present invention. FIG. 3 is a vertical cross-sectional view of the entire device, and FIG. 4 shows a part of the device with omitted. Longitudinal cross-sectional view, Figure 5 is the 4th
FIG. 6 is a cross-sectional plan view taken along line A--A in the figure, and a perspective view of the overturning box. Explanation of symbols, 3...Water tank, 15...Rainfall collector, 18...Lower drain outlet, 23...Upper drain outlet,
28...Falls, 35...Proximal slope, 36
... Tilting end side inclined surface, 37 ... Proximal end side water receiving part, 3
8... Tip side water receiving part, 39... Small hole for water drainage, 4
7, 52, 55...Measuring means.

Claims (1)

[Claims] 1. A rainfall collector that receives rainwater falling on an area having a certain area, a water tank that collects the rainwater collected by the rainwater collector, a lower drainage outlet provided at the bottom of the water tank, and the water storage tank. An upper drainage port is provided above the tank at a height corresponding to a predetermined rainfall intensity,
Receiving rainwater discharged from the upper drainage outlet, if the weight of the accumulated water exceeds a certain standard amount, it will tilt and fall into a state of overturning.In the event of a fall, a measuring means for measuring the duration of the overturning state of the overturning space. The tipping box is a box with an open top, and the bottom surface is a proximal inclined surface that becomes higher as it goes from the end on the tilting center side to the center side, and a base side inclined surface that becomes higher as it goes from the end on the tilting center side to the center side. It consists of two sloping surfaces, the tilting end side sloping surface that slopes higher as you go to the bottom side, and a small hole for draining water is formed on the tilting end side of the overturning container, and the tipping surface becomes higher as you go to the top. 1. A rainfall intensity detecting device, characterized in that, in the event of a fall, the sloped surface on the proximal end side of the device can be tilted to a state where it becomes lower as it goes from the proximal end toward the center.