JPH0718722A - Pipe connecting structure - Google Patents

Abstract

PURPOSE:To ensure normal flow of foul water on the upstream side even though water seal occurs in a lift part. CONSTITUTION:A main pipe 10 is laid, extending in a sawtooth shape with downgrade parts 12 and lift parts 13 provided alternately. A branch pipe 11 is attached to the downgrade part 12 on a point in the vicinity of the lift part 13 of the main pipe 10. Then, a point in the vicinity of the lift part 13 on the downstream side and a point in the vicinity of a part whereto the branch pipe 11 is connected to the main pipe 10 are made to communicate with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum spoiler pipe connection structure mainly used in a vacuum type waste water collecting apparatus for collecting waste water from many buildings.

[0002]

2. Description of the Related Art Conventionally, there is a vacuum type sewage collection device as one of the devices for collecting sewage from many houses.

4 and 5 show a vacuum type waste water collecting device of this type. That is, the sewage discharged from each of the houses 1 on the ground flows into the underground sewage masu 3 through the natural flow-down type sewage pipe 2 in the ground. When a certain amount of sewage accumulates in the lower part of the sewage masu 1, the vacuum valve 4 attached to the upper part of the sewage masu 1 opens and the sewage in the sewage masu 1 becomes
It is configured to flow into the vacuum drain pipe 5.

The vacuum drain pipe 5 is connected to a water collecting tank 8 of a vacuum pump station 7 having a vacuum pump 6. Then, the inside of the water collection tank 8 and the inside of the vacuum sewage pipe 5 are made to have a negative pressure by the vacuum pump 6, and the sewage flows through the inside of the vacuum drain pipe 5 stretched underground, and the water collection tank 8 Collected in. The sewage collected in this water collection tank 8 is
It is configured to be sent to a sewage treatment plant or the like by a pressure feed pump 9.

The vacuum drainage pipe 5 is mainly composed of a main pipe 10 connected to the water collection tank 8 and a large number of branches 11 connected to the main pipe 10. The entire system is laid in the shape of a tree branch.

FIG. 5 is a view showing the vicinity of the connecting portion between the main pipe 10 and the branch pipe 11 which constitute these vacuum drain pipes 5.

As shown in the figure, the main pipe 10 is generally formed continuously with a downward slope 12 having a gentle downward slope toward the water collecting tank 8 and an end of the downward slope 12. And a lift part 13 having a steep upslope of about 45 ° is provided, and the downslope part 12 and the lift part 13 are provided.
It is laid in a sawtooth shape by repeating and alternately.
The reason why the lift portion 13 is provided here is that the burying depth of the pipe becomes very deep only with the descending slope portion 12.

Then, the sewage flowing through the downward slope portion 12 gets over the lift portion 13 by the negative pressure from the water collecting tank 8 and flows through the next downward slope portion 12 again, and finally, The water is collected in the water collecting tank 8.

As a pipe connection structure used in this type of vacuum type waste water collecting apparatus, those described in Japanese Patent Publication No. 54774/1992 and Japanese Patent Laid-Open No. 4-258424 are known.

[0010]

However, such a conventional pipe connection structure has the following problems.

That is, if the amount of sewage flowing from the branch pipe 11 is large, the main pipe 10 may be filled with sewage, resulting in sealing water. Since this branching water must be provided by inclining the branch pipe 11, the opening 11a is often provided in the descending slope portion 12 near the lift portion 13 which is a relatively low position. 12 is particularly remarkable.

When water is sealed in the lift portion 13 of the main pipe 10, the vacuum pressure in the other upstream lift portion 13 and the branch pipe 11 is reduced, and the flow of sewage deteriorates. This main 10
The deterioration of the internal flow may cause the second and third sealing water, which may reduce the efficiency of the entire system.
For example, the vacuum valve 4 of the sewage tank 3 loses the force for discharging the sewage into the vacuum drain pipe 5 even if it is opened, which may impair normal operation.

Therefore, the present invention provides a drainage pipe connection structure capable of ensuring a normal flow of sewage on the upstream side even if water is sealed at the lift portion.

[0014]

In order to solve the above problems, in the present invention, a main pipe connected to a water collecting tank for collecting water by a vacuum pump, and a large number of branch pipes attached to the main pipe in a branch shape. Of the vacuum drain pipe, and a downward slope portion having a gentle downward slope toward the water collection tank, and a steep upward slope continuously at the tip of the downward slope portion. With a lift portion, another branch pipe is attached to the down slope portion near the lift portion of the main pipe or the branch pipe extended in a sawtooth shape by alternately repeating the down slope portion and the lift portion, The pipe connecting structure is characterized in that the vicinity of the downstream side of the lift portion of the main pipe or the branch pipe and the vicinity of the connecting portion of another branch pipe are connected by a ventilation pipe.

[0015]

[Operation] According to such a configuration, since the vicinity of the downstream side of the lift portion of the main pipe or the branch pipe and the vicinity of the connection portion of the other branch pipe are communicated with each other by the ventilation pipe, when the lift portion is sealed with water, A vacuum pressure is applied to the downstream side of the lift section by a vacuum pump, and the air in the branch pipe on the upstream side of the lift section flows out to the downstream side of the lift section through the ventilation pipe. For this reason, the vicinity of the lift portion in the branch pipe can be made to have a vacuum pressure, and the wastewater on the upstream side is drawn and flows by this vacuum pressure. For example, when a filthy water tank or the like is arranged on the upstream side, the next filthy water can be caused to flow out, and the sealing water in the lift portion can be released by exhaust pressure.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention. The same or equivalent parts as those in the conventional example will be described with the same reference numerals.

First, the structure will be described. Each house 1 on the ground ...
The sewage discharged from the sewage flows into the underground sewage masu 3 ... through the underground natural-flow-type sewage pipe 2. When a certain amount of sewage accumulates in the lower part of the sewage masu 1, the vacuum valve 4 attached to the upper part of the sewage masu 1 opens, and the sewage in the sewage masu 1 is a branch pipe which is a part of the vacuum drain pipe 5. 11 is configured to flow out.

That is, the natural flow type wastewater pipe 2 is
As shown in FIG. 2, the vent pipe 14 communicates, stands on the ground, and opens to the atmosphere. A valve sill 15 is embedded on the sewage spill 1. In the valve box 15, the vacuum valve suction pipe 16 and the branch pipe 11 are normally shut off,
The vacuum valve 4 that opens by the action of the vacuum valve controller 17 is provided. A sewage amount detection pipe 18 is inserted into the sewage tank 1 from the valve sill 15, and an upper end portion thereof is connected to the vacuum valve controller 17 via a gas pressure introducing pipe 19. Further, the ventilation pipe 20 for the vacuum valve controller is
One end is open to the atmosphere and the other end is connected to the vacuum valve 4 and the vacuum valve controller 17.

Of the vacuum drain pipe 5, the main pipe 10 connected to the branch pipe 11 is connected at its downstream side to a water collecting tank 8 of a vacuum pump station 7 having a vacuum pump 6. Then, the inside of the water collection tank 8 and the inside of the vacuum waste water pipe 5 are made negative pressure by the vacuum pump 6, and the waste water flows in the vacuum drain pipe 5 stretched underground.
It is collected in this water collection tank 8. The sewage collected in the water collection tank 8 is configured to be sent to a sewage treatment plant or the like by a pressure pump 9.

The vacuum drainage pipe 5 is mainly composed of a main pipe 10 connected to the water collection tank 8 and a large number of branches 11 connected to the main pipe 10. The entire system is laid in the shape of a tree branch.

FIG. 1 is a view showing the vicinity of a connecting portion between a main pipe 10 and a branch pipe 11 which constitute these vacuum drain pipes 5.

As shown in the figure, the main pipe 10 is usually formed continuously with a downward slope 12 having a gentle downward slope toward the water collecting tank 8 and an end of the downward slope 12. And a lift part 13 having a steep upslope of about 45 ° is provided, and the downslope part 12 and the lift part 13 are provided.
It is laid in a sawtooth shape by repeating and alternately.
The reason why the lift portion 13 is provided here is that the burying depth of the pipe becomes very deep only with the descending slope portion 12.

The opening 11a of the branch pipe 11 is attached so as to be substantially orthogonal to the descending slope portion 12 near the lift portion 13 of the main pipe 10.

A ventilation pipe 21 communicating from the branch pipe 11 to a position downstream of the lift portion 13 of the main pipe 10 is arranged in front of and behind the position where the branch pipe 11 of the main pipe 10 is attached. The ventilation pipe 21 includes a main pipe 10 and a branch pipe 11.
The merging angle to the main pipe 10 and the branch pipe 11 is set to 30 to 90 °, and an opening is provided in a portion extending from the upper surface to the side surface of the main pipe 10 and the branch pipe 11 so as to communicate with each other. The inside diameter of the ventilation pipe 21 is about 1/10 to 1/3 of the inside diameter of the branch pipe 11. Therefore, the sewage is configured not to flow back from the main pipe 10 toward the branch pipe 11.

Next, the operation of this pipe connection structure will be described.

First, the sewage discharged from the house 1 flows into the sewage tank 3 through the natural flow type sewage pipe 2. When the sewage flows into the sewage basin 3, the lower end of the sewage amount detection pipe 18 is closed by the sewage, and the air in the sewage amount detection pipe 18 is compressed as the sewage rises. When the air pressure exceeds a certain value, the air pressure is transmitted to the vacuum valve controller 17 through the gas pressure introducing pipe 19 to open the vacuum valve 4.

By this valve opening, due to the difference between the atmospheric pressure in the wastewater tank 3 and the vacuum pressure in the vacuum drain pipe 5, the wastewater is sucked up from the vacuum valve suction pipe 16 and passes through the vacuum valve 4. It flows out from the branch pipe 11 into the main pipe 10.

Then, the sewage flowing down the slope 12 in the main pipe 10 merges with the sewage from the branch pipe 11 and gets over the lift portion 13 by the negative pressure from the water collecting tank 8. , Flows again through the next descending slope portion 12, and is finally collected in the water collecting tank 8.

At this time, since the vicinity of the downstream side of the lift portion 13 of the main pipe 10 and the vicinity of the connection portion of the branch pipe 11 to the main pipe 10 are communicated with each other by the ventilation pipe 21, when the lift portion 13 is sealed with water. The downstream side of the lift section 13 is vacuumized by the operation of the vacuum pump 6, but the air in the branch pipe 11 on the upstream side of the lift section 12 passes through the ventilation pipe 21 and becomes the vacuum pressure.
It flows to the downstream side. For this reason, the vicinity of the lift portion 13 in the branch pipe 11 can be made to have a vacuum pressure, and the wastewater on the upstream side is pulled and flows by this vacuum pressure. For example, in this embodiment, the sewage in the sewage tank 3 disposed on the upstream side causes a difference between the atmospheric pressure in the sewage tank 3 and the vacuum pressure in the vacuum drain pipe 5, It is sucked up again from the vacuum valve suction pipe 16 and flows out from the branch pipe 11 into the main pipe 10. For this reason, the pressure on the upstream side of the lift portion 13 that has caused the water seal rises, and the back pressure pushes the accumulated dirty water to get over the lift portion 13 to release the water seal. Therefore, the normal flow of the sewage can be intermittently maintained, and there is no fear of the functional deterioration of the entire system due to sealing water as in the conventional case.

[0031]

As described above, according to the present invention, since the vicinity of the downstream side of the lift portion of the main pipe or the branch pipe and the vicinity of the connecting portion of the other branch pipe are connected by the ventilation pipe, the lift portion is connected. When water is sealed in, the lift portion downstream side is vacuumized by the vacuum pump, but the air in the branch pipe upstream of the lift portion flows out to the lift portion downstream side through the ventilation pipe. Therefore, the vicinity of the lift portion in the branch pipe can be made to have a vacuum pressure, and the sewage on the upstream side can be drawn and flowed by this vacuum pressure to ensure a normal sewage flow. Therefore, it has a practically useful effect that there is no possibility that the function of the entire system will be deteriorated due to sealing water.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing a pipe connection structure according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a pipe connection structure of the same embodiment and illustrating a part of a vacuum type waste water collecting device.

FIG. 3 is a perspective view illustrating a pipe connection structure of the same embodiment and illustrating a configuration of a vacuum type waste water collecting device.

FIG. 4 is a perspective view illustrating a conventional pipe connection structure and illustrating the configuration of a vacuum type waste water collecting device.

FIG. 5 is a cross-sectional view showing a pipe connection structure of a conventional example and viewed from a side of a main part.

[Explanation of symbols]

 5 Vacuum water distribution pipe 10 Main pipe 11 Branch pipe 12 Downhill part 13 Lift part 21 Vent pipe

Claims (1)

[Claims] 1. A vacuum drainage pipe comprising a main pipe connected to a water collecting tank for collecting water by a vacuum pump, and a plurality of branch pipes attached to the main pipe in a branch shape. Among these, there is a descending slope part having a gentle descending slope toward the water collecting tank, and a lift part having a steep ascending slope continuously at the tip of the descending slope part. The other branch pipes are attached to the descending slope part in the vicinity of the lift part of the main pipe or the branch pipe extended in a sawtooth shape by alternately repeating the parts, and the vicinity of the main pipe or the branch pipe downstream side of the lift part and the like. A pipe connection structure characterized in that the vicinity of the connecting portion of the branch pipe is communicated with a ventilation pipe.