JP2639263B2 - Shugetsu of vacuum sewer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the sheltering of a vacuum sewer system, and in particular, when there is an obstacle in a vacuum sewer line from a sewage generation source to a vacuum station, the degree of vacuum caused by the lifting of the obstacle is increased. The present invention relates to the sheltering of a vacuum sewer system that prevents a drop and expands the range in which sewage can be conveyed, and that increases the degree of freedom in designing sewer pipes.

[0002]

2. Description of the Related Art A vacuum type sewage collection system is a system for collecting sewage using a pressure difference from the atmosphere by evacuating the inside of a sewer pipe (not a complete vacuum but indicating a depressurized state). is there. FIG. 3 shows a configuration example of the vacuum type sewer system. Wastewater discharged from sanitary facilities such as homes and factories flows into a vacuum valve unit (relay unit) 32 through an inflow pipe 31. The drainage is further sent from this vacuum valve unit 32 to a vacuum station 34 via a vacuum sewer pipe 33, and then from a pump 35 to a pump pipe 36.
And sent to a sewage treatment facility.

In the vacuum station 34, sewage in a receiving tank 38 is supplied to an ejector 39 by a sewage circulation pump 37, thereby evacuating the vacuum sewer pipe 33 and collecting the sewage in the vacuum station 34. Vacuum valve unit 3
Numeral 2 is for relaying between the sewage source and the vacuum station 34, and a tank 40 into which the sewage flows from the inflow pipe 31.
A suction pipe 41 for sucking sewage in the tank body 40 and sending it to the vacuum drain 33, a vacuum valve 42 provided on the suction pipe 41, and a controller 43 for operating the vacuum valve 42
Etc. are provided. The vacuum valve 42 uses a negative pressure in the vacuum sewer pipe 33 as a driving power source. In the figure, 44 is an air pipe, 45 is an inspection port, 46 is a ventilation pipe, and 50 is a lift. The vacuum sewer pipe is usually connected to a plurality of vacuum valve units.

[0004] Such a vacuum-type wastewater collection system does not require a continuous gradient such as a gravity-flowing sewer in the construction of a pipeline, and has the following features. Since the depth of the pipeline is shallow, the cost of pipeline construction can be significantly reduced. To enable sewage construction in areas where laying of sewage is difficult due to high groundwater level, rocky ground and difficult to excavate. Construction on winding alleys is also easy. In addition, due to the forced intermittent high-speed collection of the gas-liquid mixed phase by vacuum, there is no need to worry about blockage of the pipeline, and piping with a small diameter is possible.

[0005] In the vacuum-type wastewater collection system, the transportable range (sewage collection basin) is a range where the degree of vacuum at the end of the vacuum sewer pipe is maintained at a negative pressure of 1000 to 2500 mmAq. Therefore, the transport range is the vacuum sewer conduit, if there is no factor of lowering the degree of vacuum system, the vacuum H ₀ generated by the vacuum station, a vacuum 1000~2500mmAq required of the terminal Obtained as a numerical value proportional to the subtracted value.

[0006] In such a vacuum-type wastewater collection system, when there is an ascending gradient in the vacuum sewer line, the head at that gradient consumes the degree of vacuum generated in the vacuum station, which causes a reduction in the degree of vacuum, so that it can be transported. This will cause the range to narrow. For example, as shown in FIGS. 4 and 5, in a terrain having an obstacle (for example, a river), when a vacuum sewer pipe 33 is buried so as to pass through or cross an obstacle such as a river, the lift between the ABs Is H ₁ or H ₂ . The head H ₁ or H ₂ allows the degree of vacuum H ₀ of the vacuum station to be increased.
Is correspondingly reduced (H ₀ - (H ₁ or H _2)), the transport range in this case, H ₀ - from (H ₁ or H _2), subtracting the negative pressure 1000~2500mmAq required the terminus It becomes a value proportional to the value. Therefore, the transportable range in this case is significantly narrower than the transportable range in the case of flat terrain.

For this reason, when an obstacle is formed in the vacuum sewer line from the sewage generation source to the vacuum station, it is possible to prevent the degree of vacuum from being lowered due to the lifting of the obstacle and to reduce the sewage transportable range. There is a demand for the development of technologies for expanding the technology.

The applicant of the present invention has proposed, as shown in FIG. 2, one side of an obstacle (a river in the figure) as a shelter of a vacuum type sewer which can prevent a decrease in the degree of vacuum due to the lifting of an obstacle. The provided upstream vacuum sewer pipe 2 and obstacles (rivers) 1
Of a vacuum type sewer connecting the downstream vacuum sewer pipe 3 provided on the other side, passing under the obstacle 1, passing through the upstream vacuum sewer pipe 2 and the downstream vacuum sewer pipe 3 And a ventilation pipe 5 that straddles over the obstacle 1 and connects the upstream vacuum sewer pipe 2 and the downstream vacuum sewer pipe 3. (Japanese Patent Application No. 3-20951, hereinafter referred to as "first application").

In FIG. 2, reference numeral 6 denotes a valve provided in the ventilation pipe 5, reference numeral 10 denotes an air communication pipe which is set up from the upstream vacuum sewage pipe 2, and this air communication pipe 10 has a valve. 9 are provided.

The water pipe 4 has a first pipe 4A having a downward gradient from the upstream vacuum sewer pipe 2 in the downward direction.
A second pipe 4B extending from the first pipe 4A at a gentle downward gradient to the downstream, and a third pipe rising from the second pipe 4B to the downstream vacuum sewer pipe 3. 4C.

[0011] the upstream vacuum sewer pipe 2, downstream Vacuum sewer pipe 3 is only high disposed H _A becomes higher than, the H _A is sewage water flow pipe 4 upstream vacuum sewer pipe It corresponds to the small head required to flow from 2 to the downstream vacuum drain 3.

In the above-constituted vacuum sewer system of the prior application, the valve 6 is normally opened and the valve 9 is normally closed. The sewage flowing in the upstream vacuum sewer pipe 2 passes through the water pipe 4 like a siphon and reaches the downstream vacuum sewer pipe 3, where the downstream vacuum sewer pipe 3
It flows further downstream. On the other hand, the vacuum in the downstream-side vacuum sewer pipe 3 is transmitted to the upstream-side vacuum sewer pipe 2 via the ventilation pipe 5, whereby an air lift action is performed in a lift (not shown) provided in the upstream-side vacuum sewer pipe 2. It is.

As described above, in the case of the overpass of the vacuum type sewer of the prior application, when passing through the obstacle 1, the upstream vacuum sewer pipe 2
The inner sewage is siphoned to a lower vacuum sewer pipe 3 lower than the lower sewage pipe, and a ventilation pipe 5 communicating the downstream vacuum sewer pipe 3 and the upstream vacuum sewer pipe 2 to a vacuum station. The generated negative pressure is constantly transmitted to the vacuum sewer pipe. For this reason, the negative pressure generated in the vacuum station is not consumed for pumping water in the vacuum drainage pipe when passing through the obstacle, and this negative pressure is effectively used for the head lift at another location.

[0014]

As described above, in the overrun of the vacuum sewer of the prior application, as described above, the sewage flows from the upstream vacuum sewage pipe 2 to the downstream vacuum sewage pipe 3 in the water pipe 4. In order to secure a water head necessary for the above, the upstream vacuum sewer pipe 2 is always disposed at a higher level than the downstream vacuum sewer pipe 3 by a height H _A , in other words, the downstream vacuum sewer pipe 3
Must always be disposed lower than the upstream vacuum sewer pipe 2 by a height of _HA .

However, there are cases where the downstream vacuum sewer cannot be disposed at a lower position where the level difference _HA can be ensured due to the presence of an obstacle such as a culvert in the downstream vacuum sewer. is there. In this case, the overhang of the vacuum sewer of the prior application cannot be applied to the portion.

The present invention solves the above-mentioned problems of the prior application and provides a slight tolerance in the installation level of the downstream vacuum sewer pipe, thereby increasing the degree of freedom in the design of the sewer pipe. The purpose is to provide shuffle.

[0017]

SUMMARY OF THE INVENTION The vacuum sewer of the present invention is characterized by an upstream vacuum sewer pipe provided on one side of an obstacle and a downstream vacuum sewer pipe provided on the other side of the obstacle. And a water pipe connecting the upstream vacuum sewer pipe and the downstream vacuum sewer pipe under the obstacle, and straddling the upper side of the obstacle. A vent pipe for transmitting a negative pressure of the downstream vacuum sewer pipe to the upstream vacuum sewer pipe, and a downstream end of the vent pipe is provided with the downstream vacuum sewer pipe of the water pipe. It is characterized by being connected to a nearby part.

[0018]

In the vacuum sewer of the present invention, the downstream end of the vent pipe is connected to a portion of the water pipe near the downstream vacuum sewer pipe. For this reason, the negative pressure transmitted through the ventilation pipe exerts a sewage air lift effect in a portion of the water transmission pipe from the connection position of the ventilation pipe to the downstream vacuum sewer pipe. By this air lift effect, the sewage is pumped to the downstream vacuum sewer pipe side.

Therefore, as shown in FIG. 2, it is not necessary to always arrange the downstream vacuum sewer pipe lower than the upstream vacuum sewer pipe by the height H _A , thereby increasing the degree of freedom in design.

Although the degree of vacuum generated by the vacuum station is slightly consumed due to the air lift effect, it is not so large as to impede water flow.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below more specifically with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a shelter of a vacuum sewer of the present invention.

In FIG. 1, a vacuum sewer is provided so as to cross an obstacle (a river in this embodiment) 1. Reference numeral 2 denotes an upstream vacuum sewer pipe, and reference numeral 3 denotes a downstream vacuum sewer pipe. A slightly downwardly inclined water pipe 4 is provided in the flowing direction so as to pass under the river 1, and the vacuum pipes 2, 3 are connected by the water pipe 4 so that water can flow therethrough.
The downstream side of the downstream-side vacuum sewer pipe 3 is connected to a vacuum station (not shown) so that the inside of the pipe can be depressurized.

On the other hand, a ventilation pipe 5 connecting the upstream vacuum sewer pipe 2 and the middle part of the pipe 4C of the water pipe 4 which is inclined upward toward the downstream vacuum drain pipe 3 straddles the river 1. Thus, the pressure inside the upstream vacuum sewer pipe 2 can be reduced. In this embodiment, a valve 6 is provided in the ventilation pipe 5, and an air communication pipe 10 is started up from the upstream vacuum sewer pipe 2, and a valve 9 is provided in the air communication pipe 10. .

In the overrun of the vacuum type sewer constructed as described above, the valve 6 is normally opened and the valve 9 is normally closed. The sewage G flowing in the upstream vacuum sewer pipe 2 passes through the water pipe 4 like a siphon, reaches the downstream vacuum sewer pipe 3, and flows further downstream in the downstream vacuum sewer pipe 3. The vacuum in the downstream-side vacuum sewer pipe 3 is transmitted to the upstream-side vacuum sewer pipe 2 via the ventilation pipe 5, whereby an air lift operation is performed in a lift (not shown) provided in the upstream-side vacuum sewer pipe 2. .

At this time, due to the negative pressure transmitted through the ventilation pipe 5, in the section of the water pipe 4 from the position where the ventilation pipe 5 is connected to the downstream vacuum drain 3, the downstream vacuum The pumping action in the direction of arrow R occurs due to the air lift effect by suction from the water pipe 3 side. Therefore, even if the position of the downstream vacuum sewer pipe 3 is higher than the conventional design position,
It is possible to efficiently distribute sewage.

As described above, in the overrun of the vacuum sewer, even if there is an obstacle such as the river 1, the sewage passes through it like a siphon, and is further pumped up by the air lift effect described above. The head to clear the obstacle is significantly reduced and the head loss is very small.
Therefore, the rate at which the negative pressure generated in the vacuum station is consumed in the head at the location of the obstacle is significantly reduced, and is effectively used for the head in other locations. Therefore, the basin area that can be collected by one vacuum station can be significantly expanded. Also, since the downstream vacuum sewer pipe installation level can be given a wide range, the degree of freedom in design is greatly increased.

If sediment accumulates in the water pipe 4 together with the flow of sewage, the sediment is discharged as follows. That is, the valve 6 is first closed at night or on holidays when the amount of flowing water is small, and then the valve 9 on the upstream vacuum sewer pipe 2 is opened so that air is sucked into the upstream vacuum sewer pipe 2 and the downstream side. The pressure inside the vacuum sewer pipe 3 is reduced by a vacuum station. Then, the inside of the water pipe 4 is air blown, and the sediment is discharged to the downstream vacuum sewer pipe 3. At this time, the sediment is efficiently pushed to the downstream vacuum sewer pipe 3 by the air lift effect. And is discharged. The suction of air may be performed by press-fitting with an air pump or the like.

In the present invention, the connection position of the vent pipe with respect to the water pipe is appropriately determined according to the level difference between the upstream vacuum sewer pipe and the downstream vacuum sewer pipe.

[0029]

As described above in detail, the overhang of the vacuum sewer of the present invention can be performed at the crossing part of the obstacle even if the vacuum sewer is provided so as to cross an obstacle such as a river. In the sheltering of a vacuum sewer that can effectively prevent a decrease in the degree of vacuum caused by consumption of the degree of vacuum generated in the vacuum station, it is possible to have a wide range of installation levels of sewer pipes, The degree of freedom in design is greatly expanded. For this reason, the application area of the vacuum-type wastewater collection system can be expanded, and the range in which the vacuum-type wastewater collection system can transport sewage, that is, the sewage collection basin can be significantly expanded, and the degree of freedom in design can be increased. Is very useful.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a shelter of a vacuum sewer according to the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of a sheltering of a vacuum sewer according to the prior application.

FIG. 3 is a sectional view showing a vacuum-type wastewater collecting system.

FIG. 4 is a cross-sectional view showing the sheltering of a conventional vacuum sewer.

FIG. 5 is a cross-sectional view showing the sheltering of a conventional vacuum sewer.

[Explanation of symbols]

 Reference Signs List 1 river 2 upstream vacuum sewer pipe 3 downstream vacuum sewer pipe 4 water pipe 5 ventilation pipe

Claims (1)

(57) [Claims] 1. A shelter of a vacuum type sewer connecting an upstream vacuum sewer pipe provided on one side of an obstacle and a downstream vacuum sewer pipe provided on the other side of the obstacle, A water pipe connecting the upstream vacuum sewer pipe and the downstream vacuum sewer pipe below the obstacle, and a negative pressure of the downstream vacuum sewer pipe straddling the upper side of the obstacle to the upstream vacuum sewer pipe And a vent pipe for transmission, wherein a downstream end of the vent pipe is connected to a portion of the water pipe near the downstream vacuum sewer pipe. Prone.