JP2768105B2 - Vacuum sewer aqueduct - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterway bridge of a vacuum type sewer, and more particularly, to a case where an obstacle is present in a vacuum drainage line from a sewage generation source to a vacuum station, the degree of vacuum caused by the lift of the obstacle is increased. The present invention relates to a vacuum sewerage channel bridge that prevents a drop and expands a sewage transportable range.

[0002]

2. Description of the Related Art A vacuum type sewage collection system is a system in which the inside of a sewer pipe is evacuated (not a complete vacuum, but a depressurized state is indicated) and sewage is collected using a pressure difference from the atmosphere. FIG. 2 shows a configuration example of this 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 drain 33,
Thereafter, the water is sent from the pressure pump 35 to the sewage treatment facility via the pressure pipe 36.

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. The vacuum valve unit 32 is for relaying between the sewage source and the vacuum station 34, and the tank 4 into which the sewage flows from the inflow pipe 31.
0, a suction pipe 41 for sucking sewage in the tank body 40 and sending it to the vacuum sewer pipe 33, a vacuum valve 42 provided on the suction pipe 41, and a controller 4 for operating the vacuum valve 42.
3 and so on. The vacuum valve 42 is connected to the vacuum drain 33
The internal negative pressure is used as a driving power source. In the figure, 44 is an air pipe, 45 is an inspection port, 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 sewage collection system, when there is an ascending gradient in the vacuum sewer line, the head in that gradient consumes the degree of vacuum generated in the vacuum station and the degree of vacuum is reduced. This causes a reduction, which causes a reduction in the transportable range. For example, as shown in FIGS. 3 and 4, in a terrain having obstacles (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 lift H ₁ or H _2, the vacuum degree H ₀ of the vacuum station are correspondingly reduced (H ₀ - (H ₁
Or H ₂ )), and the transportable range in this case is H ₀ − (H
₁ or H ₂ ), the required negative pressure at the terminal
It is a value proportional to the value obtained by subtracting 500 mmAq. 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 present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a vacuum sewer capable of preventing a degree of vacuum from being reduced due to the lifting of an obstacle.

[0009]

According to a first aspect of the present invention, there is provided a vacuum sewerage channel bridge comprising an upstream vacuum sewer pipe provided on one side of an obstacle and a downstream side vacuum pipe provided on the other side of the obstacle. A vacuum sewerage conduit connecting the vacuum sewer pipe, the inflow tank connected to the upstream vacuum sewer pipe, the outflow tank connected to the downstream vacuum sewer pipe, A siphon tube connecting the outflow tank and the inflow tank across the upper side, one end of the tube being inserted into the outflow tank and the other end of the tube being inserted into the inflow tank; A ventilation pipe that straddles the upper side of the obstacle and connects the upstream vacuum drain and the downstream vacuum drain, an open / close valve provided in the ventilation pipe, and a top pipe of the siphon pipe and a ventilation pipe connected to the ventilation pipe And an air bleed valve that is connected to the spill tank. In order to maintain the water seal of the siphon pipe, any one of the tip of the siphon pipe and the end of the vacuum sewer pipe connected to the inflow tank is connected to the end of the siphon pipe in each tank. It is located above. A second aspect of the present invention is a vacuum sewerage channel bridge that connects an upstream vacuum sewer pipe provided on one side of an obstacle to a downstream vacuum sewer pipe provided on the other side of the obstacle. A waterway bridge for a sewer system, wherein the trap between the one end and the other end is a lowest level portion, wherein the upstream vacuum sewer pipe is connected to the one end; A trap having a lowest level portion between the portion and the other end, the outflow trap having the downstream vacuum drain connected to the one end, and the outflow trap straddling over the obstacle. A siphon pipe connecting the other end of the inflow trap and the other end of the inflow trap, a vent pipe connecting the upstream vacuum sewer pipe and the downstream vacuum sewer pipe over the obstacle, and a vent pipe. The on-off valve provided and the air connecting the uppermost part of the siphon pipe and the ventilation pipe. And vent valve, is made comprising a.

[0010]

In the vacuum sewerage channel bridge of the present invention, when straddling an obstacle, the sewage in the inflow tank or trap connected to the upstream vacuum sewer pipe is replaced with the outflow tank or the drain tank connected to the downstream vacuum sewer pipe. Water is supplied to the trap according to the siphon principle, and a negative pressure generated in the vacuum station is always transmitted to the inside of the upstream vacuum sewer pipe by a vent pipe communicating the downstream vacuum sewer pipe and the upstream vacuum sewer pipe. For this reason,
The negative pressure generated at the vacuum station is not consumed for pumping water in the vacuum sewer pipe when straddling the obstacle, and this negative pressure is effectively used for lifting at another location.

[0011]

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 sectional view showing one embodiment of a vacuum sewerage channel bridge 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. The upstream vacuum sewer pipe 2 is connected to an inflow tank 7, and the downstream vacuum sewer pipe 3 is connected to an outflow tank 8.

The inflow tank 7 and the outflow tank 8 are connected by a siphon pipe 4 that straddles the upper side of the river 1. The downstream end (connection to the tank 7) of the upstream vacuum sewer pipe 2 is higher than the upstream end (connection to the tank 8 ) of the downstream vacuum sewer pipe 3 by a height H _A (not shown). Although disposed, this _HA corresponds to a small head required for the sewage to flow from the upstream vacuum sewer pipe 2 to the downstream vacuum sewer pipe 3 in the siphon pipe 4. The bottom of tanks 7 and 8 is upstream true
The downstream end of the empty drain 2 and the upstream end of the downstream vacuum drain 3
It is lower than either, and both ends of the siphon tube 4
The downstream end of the upstream vacuum sewer pipe 2 and the downstream vacuum
It is lower than any of the upstream ends of the water pipes 3.

The downstream side of the downstream vacuum sewer pipe 3 is connected to a vacuum station (not shown) so that the pressure inside the pipe can be reduced. The downstream-side vacuum sewage pipe 3 and the upstream-side vacuum sewage pipe 2 are connected by a ventilation pipe 5 that straddles the river 1, so that the pressure inside the upstream-side vacuum sewage pipe 2 can be reduced. In this embodiment, the ventilation pipe 5 is connected to the tanks 7 and 8.
Is in communication.

In this embodiment, an open / close valve 6 is provided in the ventilation pipe 5. If the siphon tube 4 is empty,
6 is closed and the inside of the downstream vacuum sewer pipe 3 is set to a negative pressure,
The inside of the tank 7 is set by setting the inside of the side vacuum drain 2 to atmospheric pressure.
Water is sucked into the siphon tube 4 to activate the siphon.
Can be After the siphon starts, the on-off valve 6 is opened.
You. Further, the uppermost part of the siphon pipe 4 and the ventilation pipe 5 are connected by an automatic air bleeding valve 9, so that air is not accumulated in the siphon pipe 4 .

The ends of the support alternative version tube 4, because they are located below both each of the upstream vacuum sewer pipe 2 and the downstream vacuum sewer pipe 3 of the tank connecting portion in the inflow tank 7 and the outlet tank 8, Siphon tube after siphon start
The water seal in 4 is maintained.

[0017] In aqueduct bridge vacuum sewage thus configured, sewage that has flowed upstream vacuum sewer pipe 2 flows into the inflow tank 7, flows out through the support alternative version pipe 4 in accordance with the principles of the siphon It flows into the tank 8. The air in the upstream vacuum sewer pipe 2 is gas-liquid separated in the inflow tank 7 and flows to the outflow tank 8 through the ventilation pipe 5. In the outflow tank 8, gas-liquid simultaneous suction is performed again, and the wastewater flows further downstream in the downstream vacuum sewer pipe 3.

As described above, in this vacuum sewerage channel bridge, even if there is an obstacle such as the river 1, the sewage passes through it in accordance with the principle of siphon. It becomes unnecessary and the head loss is extremely small. Therefore, the negative pressure generated in the vacuum station is effectively used for the lift at a place other than the obstacle. Therefore, the basin area that can be collected by one vacuum station can be significantly expanded. Also, the degree of freedom in design is greatly increased.

The deposits deposited in the tanks 7 and 8 may be appropriately discharged by a vacuum car or the like. Further, it is preferable that the siphon tube 4 has a downward slope toward the downstream.

In the above embodiment, the tanks 7 and 8 are used. However, in the present invention, traps 7A and 8A may be used instead of tanks as shown in FIG. Fig. 5 shows the steady state.
This is related to the state during operation, and the air vent valve 9 is closed and opened and closed.
The valve 6 is open and the inside of the siphon pipe 4 is full.
ing.

[0021]

As described above in detail, according to the vacuum sewerage channel bridge of the present invention, even when a vacuum sewer is provided so as to cross an obstacle such as a river, the crossing of the obstacle can be achieved. It is possible to effectively prevent a decrease in the degree of vacuum caused by consumption of the degree of vacuum generated in the vacuum station in the section. Therefore, the application area of the vacuum-type wastewater collection system can be expanded, and the sewage transportable range by the vacuum-type wastewater collection system, that is, the wastewater collection basin can be significantly expanded.

Further, since a pipe is provided above the obstacle,
The construction is simple. The present invention can be applied to ceiling piping in factories and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a vacuum sewerage waterway bridge of the present invention.

FIG. 2 is a sectional view showing a vacuum-type wastewater collection system.

FIG. 3 is a cross-sectional view showing a conventional vacuum sewer waterway bridge.

FIG. 4 is a cross-sectional view showing a conventional vacuum sewer channel bridge.

FIG. 5 is a sectional view showing a waterway bridge according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 River 2 Upstream vacuum sewer pipe 3 Downstream vacuum sewer pipe 4 Siphon pipe 5 Ventilation pipe 7 Inflow tank 8 Outflow tank

Claims (2)

(57) [Claims] 1. A vacuum sewerage channel bridge 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, an inlet tank the upstream side vacuum sewer pipe is connected, the outflow tank downstream side vacuum sewer pipe is connected, the outflow tank and inflow tank across upper side of the obstacle
Connects the click, one end of the tube is inserted into the outflow tank, a siphon tube and the other end of the tube is inserted into the inflow tank, the upstream straddling the upper side of the obstacle A vent pipe communicating the side vacuum sewer pipe and the downstream vacuum sewer pipe, an on-off valve provided in the vent pipe, and an air vent valve connecting the uppermost part of the siphon pipe and the vent pipe. The front end of the downstream vacuum sewer connected to the outflow tank and the rear end of the upstream vacuum sewer connected to the inflow tank are each provided to maintain a water seal of the siphon tube. Vacuum sewer aqueducts, each located above one of the ends of the siphon tube in a tank. 2. An upstream side vacuum provided on one side of an obstacle.
A vacuum sewerage bridge connecting a water pipe and a downstream vacuum sewer pipe provided on the other side of an obstacle, wherein the lowest level part is provided between one end and the other end.
Wherein the upstream vacuum drain is connected to the one end.
Trap with the lowest level between the one end and the other end.
Wherein the downstream vacuum drain is connected to the one end.
Spill trap and the other end of the spill trap over the obstruction
And a siphon pipe connecting the other end of the inflow trap, and the upstream vacuum sewer pipe and the downstream
A vent pipe connecting the side vacuum sewer pipe, an on-off valve provided on the vent pipe, and an air vent connecting the uppermost part of the siphon pipe and the vent pipe.
A vacuum sewer aqueduct comprising a valve .