JP2016079661A - Backflow prevention device for sewage basin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent at a low cost backflow of sewage from a sewage basin that accommodates rainwater into a source of sewage in a house.SOLUTION: An excess water drainage port 11 that opens toward the outside of a house 1 is formed on a flow channel at a location lower than a source of sewage 6 of the house 1, and made to communicate with a rainwater lead-in pipe 4 connected to a sewage basin 2 that stores and drains sewage from the house 1. The excess water drainage port 11 may be provided with a cover 16 that normally closes the excess water drainage port 11 and opens the excess water drainage port 11 automatically by water pressure from the rainwater lead-in pipe 4, before sewage inside the sewage basin 2 reaches the source of sewage 6. Furthermore, a flow amount throttle device 24 may be provided on the rainwater lead-in pipe 4 at a location closer to a clear water tank 2 than the excess water drainage port 11, the flow amount throttle device restricting amount of rainwater flowing into the sewage basin 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to an apparatus for preventing backflow of a sewage basin, and more specifically, in a sewage basin that stores and discharges sewage in a house, the amount of rainwater that flows into the sewage basin from the sewage basin of a house is more In many cases, the present invention relates to a device for preventing sewage from flowing backward from a sewage basin to a sewage source such as a toilet or bath in a house.

As shown in FIG. 4, rainwater may be introduced from a rain gutter 31 of a house 30 into a sewage tank (see Patent Document 1) that stores and discharges sewage such as human waste and domestic wastewater. That is, the housing eaves 32 is of a type that communicates with a sewage basin 34 buried in the ground through a vertical sword 33, and the sewage basin 34 also serves as a rainwater basin (see Patent Document 2). In this case, both the sewage generated in the house 30 and the rainwater flowing into the gutter 31 flow into the sewage gutter 34 and are discharged from the sewage gutter 34 to the sewer.

In this type of sewage basin 34, if the amount of rain that flows into the sewage basin 34 from the basin 31 exceeds the amount of drainage from the sewage basin 34 to the sewer, the sewage source 35 (toilet, bath) There is a risk that sewage including rainwater will flow back to the kitchen etc. from the sewage basin 34 and the house will be flooded.

FIG. 4 shows a state in which the inside of the vertical gutter 33 and the eaves fence 32 is full due to heavy rain, and the rainwater R overflows from the eaves gutter 32. When the sewage basin 34 is filled with rainwater flowing from the gutter 31, the sewage in the sewage basin 34 flows from the toilet as the sewage source 35 into the house. The eaves 32 constituting the gutter 31 is located at a position much higher than the sewage basin 34, so the rainwater flowing into the eaves basin 32 is pressurized in the sewage basin 34, and the backflow of sewage to the sewage source 35 is promoted. The This problem is very serious nowadays that are often hit by localized heavy rains due to global warming.

Japanese Patent Laid-Open No. 9-273166 JP-A-7-292758

As measures against this problem, it is conceivable to increase the size of the sewage basin or to provide a plurality of sewage basins. However, replacement of sewage basins that have already been buried requires a large cost and is not practical.

The present invention has been made in view of the above circumstances, and is capable of preventing sewage from flowing backward from a sewage basin into which rainwater is introduced and reaching a sewage source in a house at low cost. An object of the present invention is to provide a device for preventing backflow of soot.

In order to solve the above-mentioned problem, the apparatus for preventing backflow of sewage sewage according to the present invention has a flow path lower than a sewage source in a house, in a rainwater introduction pipe communicating with the sewage sewage for storing and discharging sewage in a house The excess water discharge port opened to the outside of the house is communicated with (1).

According to the present invention, the excess water discharge port communicating with the rainwater introduction pipe opens to the outside of the house through a flow path lower than the sewage source in the house, so that the amount of rainwater flowing into the sewage tank is from the sewage tank. If the amount is greater than the amount of drainage, excess rainwater is naturally discharged from the excess water outlet to the outside of the house after the sewage basin is full. For this reason, it can prevent that the sewage in a sewage tank flows backward and reaches | attains the sewage source in a house.

According to the present invention, since it is only necessary to provide the excess water discharge port in communication with the rainwater introduction pipe, the backflow of sewage can be prevented at low cost. Moreover, the said effect can be provided also to an existing installation, without adding a big change.

In addition, in this invention, a sewage source means the generation | occurrence | production sources of human waste or household wastewater, such as a toilet, a kitchen sink, a bathroom, a laundry.

As a preferred embodiment, a mode in which the excess water discharge port communicates with the rainwater introduction pipe on the ground is exemplified (claim 2). In this way, it is preferable that the construction for communicating the excess water discharge port with the existing equipment can be easily performed.

As a preferred embodiment, the excess water discharge port is normally closed, and the excess water discharge port is automatically closed by the water pressure in the rainwater introduction pipe before the sewage in the sewage basin reaches the sewage source. The aspect provided with the lid | cover opened to is illustrated (Claim 3). In this way, since the excess water discharge port is always closed except when it is necessary to discharge excess water, foreign matter can be prevented from entering the rainwater introduction pipe from the excess water discharge port.

In addition, the closing of the excess water discharge port by the lid can be performed by the weight of the lid, or can be performed by using a spring or the like.

As a preferred embodiment, in the rainwater introduction pipe, a mode in which a flow restrictor that restricts the inflow amount of rainwater to the sewage tank is provided at a position closer to the sewage tank than the excess water discharge port (claim). Item 4). In this case, rainwater whose inflow to the sewage basin is restricted by the flow restriction is automatically discharged from the excess water outlet. In this way, since the amount of rainwater flowing into the sewage basin is limited in advance, the backflow of sewage to the sewage source can be more reliably prevented.

It is explanatory drawing of the piping system of a sewage tank including the backflow prevention apparatus of the sewage tank which concerns on one Embodiment of this invention. It is an enlarged view of the principal part of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the piping system of the sewage tank of a prior art example.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a sewage tub 2 corresponding to a house 1 is buried in the ground of a house premises, and a sewage introduction pipe 3 and a storm water introduction pipe 4 communicate with the sewage tub (in-house sewage tub) 2. . The sewage tank 2 is known per se, receives and stores house sewage such as manure and household wastewater, and discharges the stored water to the sewer through the sewage drain pipe 5. Since the configuration of the sewage tank itself is not related to the gist of the present invention, the description thereof is omitted.

In FIG. 1, as an example of the sewage source 6 and the sewage introduction pipe 3, a toilet (toilet) in a house and a manure introduction pipe extending from the toilet to the sewage tub 2 are illustrated. Although not shown, other sewage sources 6 include a kitchen sink, a bathroom, and a laundry.

The rainwater introduction pipe 4 includes a ground pipe 7 and a buried pipe 8. The ground pipe 7 is a rain gutter of a house, and is composed of an eave fence 9 disposed along the eaves of the house 1 and a vertical fence 10 extending from the eave fence 9 to the ground outside the house. This vertical gutter 10 is connected to a buried pipe 8 disposed in the ground, and this buried pipe 8 is connected to the sewage tank 2. In the example of FIG. 1, two combinations of the vertical gutter 10 and the buried pipe 8 are provided for one eaves. However, the combination of the vertical gutter 10 and the buried pipe 8 may be at least one system. .

An excess water discharge port 11 communicates with the lower part of the downpipe 10. This excess water discharge port 11 opens to the outside of the house 1 through a flow path lower than the sewage source (toilet in the example of FIG. 1) 6 in the house 1. When the amount of rainwater flowing into the sewage tank 2 through the rainwater introduction pipe 4 is larger than the amount of drainage from the sewage tank 2 to the sewer, the excess water discharge port 11 causes the sewage in the sewage tank 2 to flow backward. Before reaching the sewage source 6, excessive rainwater is automatically discharged to the outside of the house 1 due to a difference in height from the sewage source 6.

The excess water discharge port 11 can be communicated with the buried pipe 8 in the ground. However, as shown in the example of FIG. 1, it is preferable to communicate with the downpile 10 on the ground because the construction for communicating the excess water discharge port 11 with the existing equipment can be easily performed.

Specifically, as shown in FIG. 2, the lower portion of the vertical rod 10 is divided into two vertically, and a pipe joint 12 having an appropriate shape such as a cylindrical shape or a hook shape is interposed therein. This pipe joint 12 has three ports, and the upper and lower two ports 12a and 12b are connected to the lower end 13a of the upper side hook 13 and the upper end 14b of the lower side hook 14 of the vertical hook 10 divided into the upper and lower parts, respectively. The An excess water discharge pipe 15 serving as a branch pipe is connected to the lateral port 12 c of the pipe joint 12, and an outer end opening of the excess water discharge pipe 15 serves as an excess water discharge port 11. The excess water discharge pipe 15 is arranged so that the whole is located at a position lower than the sewage source 6 in the house 1. In the example of FIG. 2, the excess water discharge pipe 15 is formed in an L shape so that the excess water discharge port 11 faces upward when connected to the pipe joint 12. However, the present invention is not limited to this, and the excess water discharge port 11 may be horizontal or downward.

According to the above configuration, the excess water discharge port 11 communicating with the lower part of the vertical gutter 10 opens to the outside of the house 1 through a flow path lower than the sewage source 6 in the house 1. When the amount of rainwater flowing into 2 is larger than the amount of drainage from the sewage basin 2 to the sewer, after the inside of the sewage basin 2 is full, excess rainwater flows from the excess water outlet 11 to the outside of the house 1. Naturally discharged. For this reason, it is possible to prevent the sewage in the sewage basin 2 from flowing back and reaching the sewage source 6 in the house 1.

Moreover, since it is only necessary to provide the excess water discharge port 11 in communication with the rainwater introduction pipe 4, it is possible to prevent the backflow of the sewage to the sewage source 6 at a low cost. Furthermore, since it is only necessary to construct the excess water discharge port 11 in communication with the lower part of the vertical shaft 10 on the ground, the above-mentioned effects can be imparted to existing facilities without any major modification.

In addition, in order to be able to cope with any amount of rainfall, it is preferable that the drainage capacity (drainage amount per unit time) of the excess water discharge port 11 is the same as the drainage capacity of the downpipe 10.

In the example of FIG. 2, a lid 16 that automatically opens and closes the excess water discharge port 11 is provided. The lid 16 always closes the excess water discharge port 11 and automatically closes the excess water discharge port 11 by the water pressure in the vertical gutter 10 before the sewage in the sewage tub 2 reaches the sewage source 6 such as a toilet. To open. By providing such a lid 16, the excess water discharge port 11 is always closed except when it is necessary to discharge excess water, so that foreign matter can be prevented from entering from the excess water discharge port 11. Providing the lid 16 is particularly effective when the excess water discharge port 11 faces upward.

The lid 16 may close the excess water discharge port 11 only by its own weight, or may close the excess water discharge port 11 by its own weight plus spring force.

FIG. 3 shows a modification of FIG. That is, it is another example of the arrangement mode of the flow path for discharging excess water. Even in this example, it is a matter of course that the entire flow path for discharging excess water is disposed at a position lower than the sewage source 6 in the house 1.

In the example of FIG. 3, a cylindrical connection box 17 extending in the vertical direction is disposed so as to wrap the lower end 13 a of the upper side cage 13 and the upper end 14 b of the lower side cage 14 of the vertical cage 10 divided into two vertically. The The connection box 17 includes an inward flange 18 at the lower end, and the upper end is open. The inward flange 18 at the lower end is liquid-tightly connected to the outer peripheral surface of the lower flange 14. A gap between the upper rod 13 and the lower rod 14 communicates with the inside of the connection box 17 so that rainwater flowing through the vertical rod 10 can also flow into the connection box 17. A space 19 defined by the inner peripheral surface of the connection box 17 and the outer peripheral surface of the lower side of the upper ridge 13 serves as an excess water flow path, and the upper end opening of the connection box 17 serves as an excess water discharge port 20.

When the amount of rainwater flowing into the sewage basin 2 through the vertical sewer 10 is larger than the amount of drainage from the sewage basin 2 to the sewer, the water level in the connection box 17 is increased by excess rainwater after the sewage basin 2 is full. The rainwater overflows from the excess water discharge port 20 and is discharged outside the house. For this reason, it is possible to prevent the sewage in the sewage basin 2 from flowing back and reaching the sewage source 6 in the house 1.

Also in the example of FIG. 3, a lid 21 that automatically opens and closes the excess water discharge port 20 is provided. The lid 21 always closes the excess water discharge port 20 and automatically opens the excess water discharge port 20 by the water pressure in the connection box 17 before the sewage reaches the toilet or the like from the sewage tank 2.

The lid 21 is always supported by the lid receiver 22. The lid receiver 22 is water-permeable, such as a net, and is disposed between the inner peripheral surface of the connection box 17 and the outer peripheral surface of the upper flange 13 and is located at the upper part inside the connection box 17. . A hole 23 for receiving the upper flange 13 is formed at the center of the lid 21. Guided by this hole 23, the lid 21 moves up and down along the upper flange 13, and the excess water discharge port 20 is automatically opened and closed according to the water pressure in the connection box 17.

In the example of FIG. 3, a flow restrictor 24 that restricts the amount of rainwater flowing into the sewage tank 2 is provided. The flow restrictor 24 is disposed at a position closer to the sewage tank 2 than the excess water discharge port 20 in the pipe of the rainwater introduction pipe 4. Specifically, as an example, a flow restrictor 24 is disposed inside the upper portion of the lower rod 14. This flow restrictor 24 restricts the amount of rainwater flowing into the sewage tank 2 by narrowing the flow path area of the lower tank 14. Rainwater whose flow into the sewage tank 2 is restricted by the flow restrictor 24 rises in the connection box 17, pushes up the lid 21 on the lid receiver 22, and flows out from the excess water discharge port 20. By providing the flow restrictor 24, the amount of rainwater flowing into the sewage trough 2 is limited in advance, so that the backflow of sewage from the sewage trough 2 to the sewage source 6 can be more reliably prevented.

If the flow restrictor 24 is provided in the downpipe 10 on the ground, it is preferable that an additional work for existing equipment can be easily performed.

Although not shown, the flow restrictor 24 can of course be applied to the example of FIG.

1 Housing 2 Wastewater basin 4 Rainwater introduction pipe 6 Sewage source (toilet, etc.)
11, 20 Excess water outlet 16, 21 Lid 24 Flow restrictor

Claims (4)

The sewage is connected to a rainwater introduction pipe communicating with a sewage tank for storing and discharging the sewage in the house, and an excess water discharge port that opens to the outside of the house through a flow path lower than the sewage source in the house.逆 Backflow prevention device. The apparatus for preventing backflow of a sewage tank according to claim 1, wherein the excess water discharge port communicates with the rainwater introduction pipe on the ground. A cover is provided that normally closes the excess water discharge port and automatically opens the excess water discharge port by water pressure in the rainwater introduction pipe before the sewage in the sewage basin reaches the sewage source. Item 3. An apparatus for preventing backflow of sewage basin according to item 1 or 2. The sewage basin according to claim 1, 2 or 3, wherein in the storm water introduction pipe, a flow restrictor is provided at a position closer to the sewage basin than the excess water discharge port to limit an inflow amount of rainwater to the sewage basin. Backflow prevention device.

Images