JP7463122B2 - Manhole Toilet System - Google Patents

Description

The present invention relates to an underground storage facility and a manhole toilet system.

Temporary toilet systems described in Patent Documents 1 and 2 are known as prior art. In this temporary toilet system, the size of the storage pipe is determined based on the population to be evacuated, and buried pipes are laid in advance, and temporary toilets are installed and used above ground in the event of a disaster. In this temporary toilet system, if the downstream sewer pipe is not affected by disaster, the storage valve is closed to store waste in the buried pipe, and after dissolving the waste in water, the valve is opened to release the water all at once, preventing waste from remaining in the storage pipe.
In this temporary toilet system, the storage valve must be opened once a day to flush the stored wastewater, and then water must be supplied to the storage pipe. In addition, with a manhole toilet, the toilet must be flushed after use. Therefore, a water source must be secured for the manhole toilet.

However, if a school swimming pool or similar were to be used as a water source, a water supply pipe would be required to run to the manhole toilet, which would place significant restrictions on where the manhole toilet could be installed, as well as the problem of insufficient water capacity.
Therefore, as in the temporary toilet system of Patent Document 3, it is also disclosed that a rainwater storage tank or the like is installed near a manhole toilet.

Japanese Patent Application Laid-Open No. 11-107362 JP 2017-127645 A JP 2017-179824 A

However, in the temporary toilet system of Patent Document 3, water is stored in the rainwater storage tank only when it rains, and there is a concern that the capacity may be insufficient depending on the number of disaster victims and the duration of the disaster. Therefore, the present inventors focused on groundwater and considered placing a trench pipe at the bottom of the underground storage facility and receiving and storing groundwater from the trench pipe.
However, the water pressure and water level of the shallow groundwater flowing at the depth where the underground storage facility is buried often changes due to rain, etc., and a new problem was discovered in that the water level drops after being stored, causing the stored water to flow out.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide an underground storage facility and manhole toilet system that can secure a sufficient water source.

In order to solve the above problems, the present invention proposes the following means.
The underground storage facility of the present invention is an underground storage facility equipped with an underground storage tank for use as a water source for a manhole toilet facility in which a temporary toilet is installed, and the underground storage tank is equipped with a water inlet for allowing groundwater to seep in, and a storage space provided below the water inlet.

In this invention, the underground storage tank is provided with a water inlet and a storage space below the lower end of the water inlet. Here, for example, when rain falls, rainwater seeps into the ground and the groundwater rises above the water inlet. This allows the groundwater to be guided from the water inlet to the storage space of the underground storage tank and stored there.
On the other hand, in fine weather, the groundwater level may be located below the inlet. Here, the storage space is provided below the lower end of the inlet. Therefore, even if the groundwater level is located below the inlet, the water stored in the storage space can be prevented from flowing out of the inlet. In other words, groundwater can be stored in the storage space of the underground storage tank without being affected by weather. As a result, for example, even when the groundwater level is low (in fine weather), the stored groundwater can be used as a water source, and sufficient water capacity can be secured.

The water inlet may also be a trench pipe, an infiltration tank or an infiltration manhole.

In this case, by using a trench pipe, infiltration tank, or infiltration manhole as the inlet, it is possible to prevent underground gravel, crushed stone, etc. from entering the storage space of the underground storage tank through the inlet. This allows only underground groundwater to be guided from the inlet into the storage space and stored there.

The underground storage tank may further include an opening/closing section that can open and close the upper end of the underground storage tank.

In this case, an opening and closing section is provided at the top end of the underground storage tank. Therefore, when utilizing the water stored in the storage space of the underground storage tank, the opening and closing section can be opened and, for example, a pump can be placed in the storage space. This allows the water stored in the storage space to be sent to the required location by the pump.

The manhole toilet system of the present invention comprises the underground storage facility, a pump provided in the storage space, and a manhole toilet facility connected to the pump.

In this invention, a pump is provided in the storage space of the underground storage tank and is connected to the manhole toilet facility. Therefore, for example, in the event of a disaster, the water stored in the storage space of the underground storage tank can be used for the toilet facility by sending it to the manhole toilet facility by the pump.
Here, the storage space of the underground storage tank is provided below the lower end of the water inlet. Therefore, a sufficient volume of groundwater can be stored in the storage space of the underground storage tank without being affected by weather, and the water stored in the storage space can be sent to the manhole toilet facility. This allows the water stored in the storage space of the underground storage tank to be used as a water source to ensure that the manhole toilet facility continues to function reliably during disasters, etc.
In addition, the groundwater stored in the storage space of the underground storage tank can also be used for firefighting purposes as fire prevention water.

According to the present invention, the storage space of the underground storage tank is located below the lower end of the water inlet, so that a sufficient water source can be secured.

1 is a cross-sectional view showing an underground storage facility according to a first embodiment of the present invention. 1 is a schematic diagram showing a manhole toilet system equipped with an underground storage facility of a first embodiment. FIG. FIG. 4 is a cross-sectional view showing an underground storage facility according to a second embodiment of the present invention. FIG. 11 is a cross-sectional view showing an underground storage facility according to a third embodiment of the present invention.

Below, we will explain an underground storage facility and manhole toilet system according to one embodiment of the present invention with reference to the drawings.

First Embodiment
As shown in Fig. 1, the manhole toilet system 1 is a system that allows temporary toilets to be installed above ground and used in the event of a disaster, for example. The manhole toilet system 1 includes an underground storage facility 2, a water pump (pump) 3, and a manhole toilet facility 5. In the underground storage facility 2, the water pump 3 is disposed in a storage space 22, which will be described later. The water pump 3 is connected to a toilet pipe 41 of the manhole toilet facility 5 via a supply pipe (pipe) 7.

<Underground storage facility>
As shown in Fig. 2, the underground storage facility 2 includes an underground storage tank (underground water tank) 10, a trench pipe (water inlet) 11, and an opening/closing section (lid) 12. The underground storage tank 10 is buried in the ground while being disposed vertically with respect to the ground surface 15. The underground storage tank 10 is formed into a bottomed cylindrical shape by a peripheral wall 17 and a bottom 18, and has an opening 19 at the upper end. The underground storage tank 10 has a storage space (water storage space) 22 formed below an internal space 21.

In this embodiment, the upper part of the peripheral wall 17 is formed as a tapered section 17a that gradually reduces in diameter toward the top. Therefore, the opening 19 is formed to an appropriate size while ensuring a large internal space 21 of the underground storage tank 10. The opening (upper end) 19 is disposed approximately flush with the ground surface 15. The opening 19 is provided with an opening/closing section 12 that can open and close the opening 19.

An attachment opening 24 is opened in the peripheral wall 17 at a position at a predetermined height from the bottom 18. The trench pipe 11 is attached to the attachment opening 24.
The lower end 11a of the trench pipe 11 is disposed above the storage space 22. In other words, the portion of the internal space 21 of the underground storage tank 10 below the lower end 11a of the trench pipe 11 constitutes the storage space 22. The inside of the trench pipe 11 is in communication with the internal space 21 (storage space 22) of the underground storage tank 10.

The trench pipe 11 includes, for example, a cylindrical pipe 25, a pipe connection portion 26, and a blocking portion 27. The base end portion 25a of the cylindrical pipe 25 is attached to the mounting port portion 24. In the illustrated example, the base end portion 25a is fitted into the mounting port portion 24. The cylindrical pipe 25 extends from the mounting port portion 24 perpendicular to the peripheral wall 17 and is buried in the ground. In other words, the cylindrical pipe 25 is disposed approximately horizontally with respect to the ground surface 15. The cylindrical pipe 25 may have a drainage gradient toward the underground storage tank 10.

The tubular pipe 25 is formed, for example, in a cylindrical shape, and has a number of infiltration holes 29. Each infiltration hole 29 is formed to prevent underground gravel, crushed stone 33, etc. from penetrating into the inside of the tubular pipe 25, and allows only groundwater to penetrate from the ground into the inside of the tubular pipe 25.

A pipe connection part 26 is attached to the tip 25b of the cylindrical pipe 25. The pipe connection part 26 includes a connection pipe 31 fitted to the tip 25b of the cylindrical pipe 25 and a flange 32 extending from the end of the connection pipe 31. A blocking part 27 is attached to the flange 32. This causes the tip 25b of the cylindrical pipe 25 to be sealed by the pipe connection part 26 and the blocking part 27. Alternatively, multiple cylindrical pipes 25 may be connected by attaching the flange 32 of one pipe connection part 26 to the flange 32 of another pipe connection part 26. Crushed stones 33, for example, are arranged around the trench pipe 11.

The trench pipe 11 functions as an infiltration device that supplies groundwater from the ground into the storage space 22 through the infiltration hole 29. The infiltration manhole 102 and infiltration manhole 116 in other embodiments described below have a similar configuration.

Here, for example, when it rains, rainwater seeps into the ground and the groundwater rises to the first water level 35. On the other hand, when it is sunny, the groundwater level drops to the second water level 36. When buried in the ground, the trench pipe 11 is arranged so that, for example, when it rains, it is located below the first groundwater water level 35, and when it is sunny, it is located above the second groundwater water level 36.

This allows groundwater to seep into the trench pipe 11 during rainfall. The water that seeps into the trench pipe 11 is guided to the storage space 22 of the underground storage tank 10 and stored there.

As described above, according to the first embodiment of the underground storage facility 2, during rainfall, the first water level 35 is located above the trench pipe 11, and groundwater can be guided from the multiple infiltration holes 29 in the trench pipe 11 to the storage space 22 of the underground storage tank 10 and stored therein.
Here, the storage space 22 is provided below the lower end 11a of the trench pipe 11. Therefore, even if the second water level 36 is located below the trench pipe 11 on a fine day, the water stored in the storage space 22 can be prevented from flowing out of the trench pipe 11.
That is, the underground storage facility 2 can store groundwater in the storage space 22 of the underground storage tank 10 without being affected by weather. As a result, even when the groundwater level is low (on fine weather), for example, the stored groundwater can be used as a water source, and a sufficient water capacity can be secured.

An opening/closing section 12 is also provided at the top end of the underground storage tank 10. Therefore, when utilizing the water stored in the storage space 22 of the underground storage tank 10, the opening/closing section 12 can be opened and, for example, a water pump 3 can be placed in the storage space 22. This allows the water stored in the storage space 22 to be sent to the required location by the water pump 3.

<Manhole toilet facilities>
As shown in Fig. 1, a manhole toilet facility 5 is provided adjacent to the underground storage facility 2. The manhole toilet facility 5 includes a toilet pipe 41, vertical shafts 42 and 43, a vertical pipe 44, a toilet bowl (temporary toilet) 45, and a cover member 46.

The toilet pipe 41 is buried underground and extends horizontally with a required drainage gradient relative to the ground surface 15. At the upper and lower ends of the toilet pipe 41, vertical shafts 42, 43 each having an openable and closable gate 48 are attached. The vertical shaft 42 at the upper end of the toilet pipe 41 is formed so that the water pump 3 can be connected via the supply pipe 7. In addition, a sewage pipe, a sewage treatment tank, etc. are connected to the vertical shaft 43 at the lower end of the toilet pipe 41.
The cross section of the toilet pipe 41 may be circular or rectangular, or may be non-circular, such as oval, elliptical, or egg-shaped.

A single or multiple vertical pipes 44 are attached to the toilet pipe 41, extending generally vertically toward the ground. The upper end of the vertical pipe 44 is installed so that it reaches the ground. This upper end is provided with a connection port 51 to which a temporary toilet bowl 45 can be connected in the event of a disaster. The lower end of the vertical pipe 44 is connected to the upper side of the toilet pipe 41. It is preferable that multiple vertical pipes 44 are provided at intervals along the axial direction of the toilet pipe 41.

At least one of a lid, a seal member, an opening/closing valve, and a joint for connecting to a toilet bowl 45 of a temporary toilet is attached to the connection port 51 at the upper end of the vertical pipe 44 as necessary.
For example, a cover member 52 (or a protective cover) that normally covers the periphery of the upper end of the vertical pipe 44 is attached to the upper end of the vertical pipe 44. The cover member 52 may be integral with the upper end of the vertical pipe 44 or may be separate from the upper end of the vertical pipe 44.

The cover member 52 is, for example, a metal or resin structure having a box-shaped cover body and a lid member attached to an opening on the top surface of the cover body so that it can be opened and closed. The lid member is installed almost flush with the ground surface. In order to keep the cover body buried in the ground, a locking flange portion 52a can be formed on the side of the cover body so as to protrude in the lateral direction. The locking flange portion 52a is provided around the entire circumference of the cover body or around a portion of the circumference.

A variable joint that can absorb the effects of shaking caused by earthquakes and the like by tilting can be used for the connection 54 between the lower end of the vertical pipe 44 and the upper surface of the toilet pipe 41. This variable joint can be, for example, a spherical joint. This spherical joint is attached to the outer surface of the toilet pipe 41 via, for example, a cylindrical (or curved) saddle member (or other branch joint). This saddle member is abutted and fixed to cover an opening formed in the toilet pipe 41 (upper surface). However, the configuration of the saddle member and the attachment means are not limited to this.

The toilet bowl 45 installed at the upper end (connection port 51) of the vertical pipe 44 is individually enclosed by a cover member 46. A water tank for supplying water for flushing may also be connected to the toilet bowl 45.

As described above, according to the manhole toilet system 1 of the first embodiment, in the event of a disaster, the manhole toilet facility 5 can be used as a temporary toilet by attaching the toilet bowl 45 to the upper end of the vertical pipe 44. In this case, the water stored in the storage space 22 of the underground storage tank 10 is used as the water source for the manhole toilet facility 5.
When utilizing the water stored in the storage space 22 of the underground storage tank 10, the opening/closing part 12 can be opened and the water pump 3 can be placed in the storage space 22. Also, the supply pipe 7 of the water pump 3 can be connected to the vertical shaft 42 of the manhole toilet facility 5. Therefore, for example, in the event of a disaster, the water stored in the storage space 22 of the underground storage tank 10 can be sent to the vertical shaft 42 of the manhole toilet facility 5 by the water pump 3, thereby allowing the underground storage facility 2 to be used as a water source for the manhole toilet facility 5.

That is, the storage space 22 of the underground storage tank 10 is provided below the lower end 11a of the trench pipe 11. Therefore, the underground storage facility 2 can store a sufficient amount of groundwater in the storage space 22 without being affected by weather, and the stored water can be sent to the vertical shaft 42 by the water pump 3.
The water sent to the vertical shaft 42 can be drained into the toilet pipe 41 by opening the gate 48. Thus, the waste in the toilet pipe 41 can be dissolved in the drained water and drained from the vertical shaft 43 at the lower end of the toilet pipe 41 into a sewage pipe or a sewage treatment tank. This allows the waste in the toilet pipe 41 to be discharged from the toilet pipe 41 without remaining therein.

Here, the underground storage tank 10 can store groundwater in the storage space 22 without being affected by weather. Therefore, for example, even when the groundwater level is low (on fine weather), the stored groundwater can be used as a water source for the manhole toilet facility 5, and a sufficient water capacity can be secured.
This allows the water stored in the storage space 22 to be used as a water source to ensure that the manhole toilet facility 5 continues to function reliably during disasters, etc.
In addition, the groundwater stored in the storage space 22 of the underground storage facility 2 (specifically, the underground storage tank 10) can also be used for firefighting purposes as fire prevention water.

Next, the underground storage facilities of the second and third embodiments of the present invention will be described with reference to Figures 3 and 4. In the second and third embodiments, the same reference numerals are used for the components that are the same as or similar to those in the first embodiment, and their description will be omitted, with only the differences being described.

Second Embodiment
As shown in Fig. 3, the underground storage facility 100 includes a seepage mass (water inlet) 102 instead of the trench pipe 11 of the first embodiment, and other configurations are the same as those of the underground storage facility 2 of the first embodiment. The seepage mass 102 includes a trench pipe 103 and a seepage mass body 104.

In the trench pipe 103, similar to the trench pipe 11 of the first embodiment, the base end 106a of the cylindrical pipe 106 is provided at the mounting port 24, and a plurality of infiltration holes 29 are formed in the cylindrical pipe 106. The infiltration mass body 104 is connected to the tip end 106b of the cylindrical pipe 106. That is, in the underground storage tank 10, the storage space 22 is provided below the lower end 103a of the infiltration mass 102 (trench pipe 103).

The permeation mass body 104 is formed, for example, in a cylindrical shape with a bottom. An opening 104a is formed at the upper end of the permeation mass body 104. The opening 104a is closed by an opening/closing lid 108 so that it can be opened and closed. The tip 106b of the cylindrical tube 106 is connected to the center of the permeation mass body 104 in the vertical direction.

The infiltration mass body 104 has a number of infiltration holes 109 formed, for example, in the lower peripheral wall 104b of the cylindrical pipe 106. Each infiltration hole 109 is formed to prevent gravel and crushed stone 107 from the ground from entering the inside of the infiltration mass body 104, and to allow only groundwater to infiltrate from the ground into the inside of the infiltration mass body 104. Crushed stone 107, for example, is arranged around the infiltration mass body 104 and the trench pipe 103.

According to the infiltration mass 102, groundwater can be guided from a plurality of infiltration holes 29 into the inside of the trench pipe 103, and the groundwater guided into the inside of the trench pipe 103 can be stored in the storage space 22 of the underground storage tank 10. In addition, groundwater can be guided into the inside of the infiltration mass main body 104 from a plurality of infiltration holes 109 in the infiltration mass main body 104. Furthermore, the groundwater guided into the inside of the infiltration mass main body 104 can be stored in the storage space 22 of the underground storage tank 10 via the trench pipe 103.

As described above, according to the second embodiment of the underground storage facility 100, similar to the underground storage facility 2 of the first embodiment, even when the groundwater level drops (on sunny days), for example, the stored groundwater can be utilized as a water source, and sufficient water capacity can be secured.
Furthermore, according to the underground storage facility 100 of the second embodiment, the stored groundwater can be utilized as a water source for the manhole toilet facility 5, even when the groundwater level is low (on fine weather), for example.

Third Embodiment
As shown in Figure 4, the underground storage facility 110 has an infiltration manhole (water inlet) 113 in an underground storage tank 112 instead of the trench pipe 11 of the underground storage facility 2 of the first embodiment, and the other configurations are similar to those of the underground storage facility 2 of the first embodiment.

The seepage manhole 113 is formed by a partial area 116 of the peripheral wall 114 of the underground storage tank 112. A plurality of seepage holes 118 are formed between the upper end 113b and the lower end 113a of the seepage manhole 113 (the area 116). The lower end 113a of the seepage manhole 113 is disposed above the storage space 22. The upper end 113b of the seepage manhole 113 is disposed approximately flush with or below the first water level 35. In other words, the storage space 22 is provided below the seepage manhole 113.

The multiple infiltration holes 118 are formed to prevent underground gravel, crushed stone 119, etc. from entering the inside of the infiltration manhole 113, and to allow only groundwater to infiltrate from the ground into the inside of the infiltration manhole 113. Around the infiltration manhole 113, for example, crushed stone 119, etc. are arranged.
Groundwater can be guided into the infiltration manhole 113 through the multiple infiltration holes 118 of the infiltration manhole 113. The groundwater guided into the infiltration manhole 113 can be stored in the storage space 22 of the underground storage tank 112.

As described above, according to the underground storage facility 110 of the third embodiment, similar to the underground storage facility 2 of the first embodiment, even when the groundwater level drops (on sunny days), for example, the stored groundwater can be utilized as a water source, and sufficient water capacity can be secured.
Furthermore, according to the underground storage facility 110 of the third embodiment, the stored groundwater can be utilized as a water source for the manhole toilet facility 5, even when the groundwater level is low (on fine weather), for example.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the manhole toilet facility 5 is not limited to the configuration shown in the above embodiment.
Other infiltration devices (outlets) may be used instead of the trench pipe 11, the infiltration basin 102, and the infiltration manhole 113. Examples of the infiltration device (outlet) include a configuration in which groundwater is supplied from the ground to the storage space through a infiltration hole. Even in this case, the space in the underground storage tank 10 that is located below the infiltration device (outlet) can be used as the storage space 22.

In addition, the components in the above embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be combined as appropriate.

1 Manhole toilet system 2,100,110 Underground storage facility 3 Water pump 5 Manhole toilet facility 7 Supply piping (piping)
10, 112 Underground storage tank 11 Trench pipe (water inlet)
12 Opening and closing part 22 Storage space 45 Toilet bowl (portable toilet)
102 Infiltration tank (water inlet)
103 Trench pipe 11a, 103a Lower end of trench pipe (lower end of water inlet)
113 Infiltration manhole (water inlet)
113a Lower end of infiltration manhole

Claims (3)

A manhole toilet system having an underground storage facility with an underground storage tank for use as a water source for a manhole toilet facility in which a temporary toilet is installed,
The underground storage tank includes a water inlet through which groundwater permeates and a storage space provided below the water inlet ,
The manhole toilet system comprises:
A pump provided in the storage space;
A manhole toilet system comprising: a manhole toilet facility connected to the pump. The manhole toilet system according to claim 1, wherein the water inlet is provided in a trench pipe, a seepage basin or a seepage manhole. The manhole toilet system according to claim 1 or claim 2, further comprising an opening/closing part capable of opening and closing the upper end of the underground storage tank.

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