JP7127791B1 - Channel system for backwater countermeasures - Google Patents

Abstract

[Problem] To take measures against backwater, a pipeline for generating a water flow from a tributary side to a main stream side is formed so as to extend from the tributary side to a confluence point and extend to the main stream side. To provide a water channel system for backwater countermeasures capable of surely taking countermeasures against backwater and having a low construction cost. Kind Code: A1 The present invention is a water channel system for countermeasures against backwater using a pipeline 3 which passes through a confluence point 4 from a tributary stream 2 to a main stream 1 and is arranged in the main stream 1. The pipeline 3 is , a branch pipeline portion 7 arranged in the branch stream 2 and a main stream pipeline portion 8 arranged in the main stream 1 , and the branch pipeline portion 7 is configured such that the longitudinal direction of the branch pipeline portion 7 is the water of the branch stream 2 . and passes through the confluence point 4 with the main stream 1, and is connected to the main stream pipe portion 8 installed so as to be parallel to the water flow of the main stream 1. It is characterized by [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backwater countermeasure waterway system.

In recent years, the frequency of heavy rainfall and heavy rainfall due to linear rainfall belts has increased, and landslides and floods have become more serious. In particular, flood damage in the suburbs of large cities causes traffic disturbances such as roads and railroads, and as a result paralyzes the urban functions of large cities, resulting in considerable damage.

Sudden flood damage to important urban facilities and high-value-added buildings caused by backwaters and inland water flooding, which had not been anticipated in the past, began to appear, creating a problem that required enormous restoration costs. rice field. In other words, it can be said that there are frequent floods that exploit the blind spots of flood control technology based on conventional river development.

Here, the backwater is an indicator that the effect of water level changes downstream reaches the upstream. It refers to a phenomenon in which the water level suddenly rises upstream.

In recent years, when the water level at the downstream end of a tributary (confluence point) is lower than the maximum water level of the main stream, or when the water pressure of the main stream exceeds the water pressure of the tributary, the water level of the tributary rises and floods the tributary. The backwater phenomenon has occurred frequently, and how to deal with it has been an issue.

In the past, so-called popular-type drainage pump stations (no restrictions on drainage capacity) and gate pumps (drainage capacity of 6 m ³ /sec or less per gate) have been planned to take measures against backwater, but both are expensive. However, due to the system's complexity, it was not possible to deal with all countermeasures.

Japanese Patent No. 6751981

The present invention has been devised to address the above-mentioned conventional problems. To provide a water channel system for countermeasures against backwater, which can certainly take countermeasures against backwater by forming a pipe line extending to the side, and at a low construction cost.

The present invention
A waterway system for countermeasures against backwater using a pipeline arranged in the main stream passing through a confluence point from a tributary to the main stream,
The pipeline has a tributary pipeline portion arranged in the tributary stream and a main stream pipeline portion arranged in the main stream, and the tributary pipeline portion has a longitudinal direction that corresponds to the water flow of the tributary stream. Using a pipeline that is installed in parallel, passes through the point of confluence with the main stream, and is connected to the main stream pipeline part that is installed in parallel with the flow of water in the main stream,
characterized by
or,
The pipeline is installed at an aerial position above the normal water level of the river,
characterized by
or,
The pipeline is attached to the side wall surface of the river,
characterized by
or,
The pipeline is attached to the side wall surface of the river so as to be movable in the vertical direction from the normal water level to the dangerous water level.
characterized by
or,
A waterway system for countermeasures against backwater using a pipeline arranged in the main stream passing through a confluence point from a tributary to the main stream,
The pipeline attached to the side wall surface of the river has a tributary pipeline section arranged in the tributary and a main stream pipeline section arranged in the main stream, and the tributary pipeline section is the longitudinal direction of the tributary pipeline section. Using a pipeline that is installed so that the direction is parallel to the flow of water in the tributary stream, passes through the confluence point with the main stream, and is connected to the main stream pipeline part that is installed so as to be parallel to the flow of the main stream. and
Furthermore, the pipeline is attached to the side wall of the river so as to be movable in the vertical direction from the normal water level of the river to the dangerous water level.
characterized by
or,
A water channel system for countermeasures against backwater using a pipeline arranged in the water of the main stream, passing through the water at the confluence point from the water in the tributary to the main stream,
The pipeline has a tributary pipeline portion arranged in the tributary stream and a main stream pipeline portion arranged in the main stream, and the tributary pipeline portion has a longitudinal direction that corresponds to the water flow of the tributary stream. It is installed in parallel and is connected to the main stream pipe section installed in the direction parallel to the main stream water flow through the confluence point with the main stream,
characterized by
or,
A diffuser for increasing the water flow in the pipeline is attached to the front end opening and the rear end opening of the pipeline,
characterized by
or,
A screen is provided in front of the opening at the tip of the pipeline to avoid obstacles and falling objects flowing in the river and allow only water to flow into the pipeline.
It is characterized by

According to the present invention, a pipeline that generates a water flow from the tributary side to the main stream side in order to take countermeasures against backwater is formed to extend from the tributary side to the confluence point and extend to the main stream side. In addition, it is possible to provide a backwater countermeasure waterway system that can reduce the construction cost.

1 is an explanatory diagram for explaining the configuration of a first embodiment of the present invention; FIG. It is explanatory drawing (1) explaining the structure of 2nd Example of this invention. It is explanatory drawing (2) explaining the structure of 2nd Example of this invention. It is explanatory drawing (3) explaining the structure of 2nd Example of this invention. It is explanatory drawing (1) explaining the structure of 3rd Example of this invention. It is explanatory drawing (2) explaining the structure of 3rd Example of this invention. It is explanatory drawing (3) explaining the structure of 3rd Example of this invention. It is an explanatory view explaining the composition of the 4th example of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
FIG. 1 shows a first embodiment of the invention. FIG. 1 is a schematic diagram illustrating the configuration of the present invention, showing a main stream 1 and a branch stream 2, and a confluence point 4 where the main stream 1 and the branch stream 2 join.

When there is intense rainfall, etc., the water flow 15 of the main stream 1 is strengthened, the water increases, and the water surface of the main stream 1 rises sharply. In this case, at the confluence point 4 of the main stream 1 and the branch stream 2, the water flow 15 from the branch stream 2 does not flow to the main stream 1 side, and the flow of the branch stream 2 is cut off. Then, a backflow occurs in the tributary 2. When backflow occurs, the water flow 15 near the confluence point 4 of the tributaries 2 also stagnate, and the water surface rises. Rising water levels can cause levee failures and the like, resulting in flood conditions. The present invention was devised to avoid such situations.

Here, in the present invention, a pipeline 3 is installed, which is configured as a water channel through which water flows in a hollow portion straddling the main stream 1 and the branch stream 2 . The material of the pipe line 3 is not limited at all, but it may be composed of a substantially cylindrical pipe member so as to form a water channel through which water flows in the hollow portion. The shape of the hollow portion is not particularly limited, and may be an angular hollow portion, a circular hollow portion, an elliptical hollow portion, or a triangular hollow portion. I don't mind. Further, the pipeline 3 may be formed of a flexible pipeline formed of a flexibly bendable member.
However, as shown in FIG. 1, the pipeline 3 is arranged in a state in which it passes from the water in the tributary 2 to the water at the confluence point 4 and is directed into the main stream 1 .

This is because the pipe line 3 is configured as a so-called countermeasure against backwater. As shown in FIG. 1, the pipeline 3 is installed, for example, on one side of the main stream 1 in the vicinity of a confluence point 4 where the tributaries 2 flowing at a predetermined angle join the main stream 1 .

That is, the pipeline 3 has a branch pipeline section 7 provided in the branch stream 2 and a main stream pipeline section 8 provided in the main stream 1, and the branch pipeline section 7 extends along the branch stream 2 in the longitudinal direction. provided parallel to the flow of The branch pipeline portion 7 passes through the confluence point 4 and is connected to the main stream pipeline portion 8 installed in the direction parallel to the flow of the main stream 1 . Therefore, as shown in FIG. 1, the pipeline 3 is formed by bending the branch pipeline portion 7 and the main stream pipeline portion 8 into a substantially V-shape, for example.

Here, the pipeline 3 may be installed at the bottom of the main stream 1, the confluence point 4, and the tributary stream 2. In that case, it is installed at a substantially central position on the bottom surfaces of the main stream 1 and the branch stream 2 .

As described above, when intense rainfall occurs, the water flow 15 in the main stream 1 becomes stronger and the water level rises sharply. In this case, at the confluence point 4 of the main stream 1 and the branch stream 2, the water flow 15 from the branch stream 2 does not flow to the main stream 1 side, and the flow of the branch stream 2 is cut off from the flow of the main stream 1. This is because the water level of the main stream 1 rises due to a sudden increase in water level due to intense rainfall, etc., and the water pressure at that point increases, pushing back the water flow 15 of the tributary stream 2 . Then, a reverse flow occurs in the tributary 2 from the downstream to the upstream. When backflow occurs, the water surface near the confluence point 4 of the tributaries 2 rises, which in turn causes embankment failure and the like, resulting in a flood condition.
However, if the pipe line 3 is installed in a state in which it passes from the water in the tributary stream 2 to the water at the confluence point 4 and is directed into the main stream 1, the above situation can be resolved.

That is, the water surface of the branch stream 2 near the confluence point 4 is higher than the water surface of the main stream 1 near the confluence point 4 . Then, the hydraulic pressure of the water entering the tip opening 9 of the tributary pipeline portion 7 installed in the water of the tributary stream 2 is the hydraulic pressure of the water entering the rear end opening 10 of the main pipeline portion 8 installed in the water of the main stream 1. get higher. When the water pressure entering the tip opening 9 of the branch pipe section 7 becomes higher than the water pressure entering the rear end opening 10 of the main flow pipe section 8, the flow 15 of water entering the pipe line 3 is pushed into the branch pipe. It flows from the front end opening 9 of the channel portion 7 toward the rear end opening 10 of the main flow pipe portion 8 . Due to the water flow 15 in the pipeline 3, the water level in the tributary 2 near the confluence point 4 is lowered, thereby preventing bank collapse and the like.

The pipeline 3 is filled with water, and the elevation difference (water This is because the water flow 15 moves from the high water pressure side to the low water pressure side due to the pressure difference between the water pressures. It can be said that water is pushed out and moved by water pressure. In other words, in the pipeline 3, the difference in elevation between the front end opening 9 of the tributary pipeline portion 7 and the rear end opening 10 of the main pipeline portion 8 changes, causing the main pipeline portion 8 to When the amount of water entering from the rear end opening 10 is reduced and the difference in water surface elevation between the two is significantly reversed, the amount of water entering from the rear end opening 10 is reduced from the front end opening 9 side of the branch pipe portion 7 to the rear end opening 10 side of the main flow pipe portion 8. Water will be pushed out into the water. The flow of water is indicated by an arrow line and denoted by reference numeral 15. FIG.

Next, a second embodiment will be described.
In the second embodiment, as shown in FIG. 2, a diffuser 12 is provided at the front end opening 9 of the branch pipe portion 7 and the rear end opening 10 of the main flow pipe portion 8 . By providing the diffuser 12, it is possible to change the water pressure in the existing river water flow and further increase the amount of water flow 15 in the pipeline 3 from the branch 2 side to the main stream 1 side. As shown in FIG. 3, the diffuser 12 comprises a cylindrical main body 13 and a flange 14 extending conically from one end surface of the main body 13. As shown in FIG.

3, a diffuser 12 is provided with the other end surface of the main body 13 in contact with the rear end opening 10 of the main flow pipe portion 8, and the tip opening 9 of the branch pipe portion 7 is provided with a predetermined , and the diffuser 12 is provided with the opening of the flange portion 14 directed.

By arranging the diffuser 12 as described above, the diffuser 12 provided on the side of the tip opening 9 of the tributary pipeline portion 7 has an outer portion between the flange portion 14 and the tip opening 9 of the tributary pipeline portion 7. The water flow 15 is turned outward at the collar 14 , thereby reducing the water pressure outside between the collar 14 and the tip opening 9 of the branch pipe section 7 . Due to this pressure reduction, the suction force of water flowing into the opening of the flange portion 14 of the diffuser 12 on the side of the tip opening 9 of the branch pipe portion 7 is strengthened, and more water flow 15 can be sent to the tip opening 9 of the branch pipe portion 7. I can.

In addition, in the diffuser 12 provided in a state where the other end surface of the main body 13 is in contact with the rear end opening 10 of the main flow conduit portion 8, the water flow 15 around the flange portion 14 of the diffuser 12 is shown by the arrow line. As a result, the water pressure around the opening of the flange portion 14 (downstream side) is reduced. This decompression causes a pulling force of the water on the side of the rear end opening 10 of the main flow pipeline portion 8, and the water is caused to flow into the opening of the flange portion 14 of the diffuser 12 on the side of the tip opening 9 of the branch pipeline portion 7. The attractive force will be further strengthened. Incidentally, as shown in FIG. 2, the pipe diameter of the main stream pipe line portion 8 may be larger than that of the branch pipe pipe portion 7 . The effect of the diffuser 12 can be further enhanced by increasing the pipe diameter of the main flow pipe portion 8 .

In FIG. 4, a pump 16 is attached to the pipeline 3 so that water is forced to flow from the tributary 2 to the main stream 1 side.
This pump 16 is used in addition to the construction of the present invention shown in other embodiments such as the first embodiment and the second embodiment.
Further, as shown in FIG. 4, a main flow pipeline 20 is installed in the main flow 1 in a direction parallel to the water flow 15, and the rear end side of the pipeline 3 is inserted into the side surface of this main flow pipeline 20. A connected pipe body may be constructed.
With such a pipe body, the water flow 15 on the side of the tributary stream 2 can be increased, thereby quickly eliminating the backwater phenomenon.

5 to 7 show a third embodiment of the invention. As can be understood from FIG. 5, in the third embodiment, for the pipeline 3 installed on the bottom surface of the main stream 1 and the tributary stream, a filter is placed in front of the tip opening 9 in the tributary pipeline section 7 so as to surround the tip opening 9 . The effective screen 11 is bent into a so-called streamline shape such as a substantially V-shape that can "avoid/dodge" falling objects and obstacles. The flow of the tributary 2 and the main stream 1 contains not only river water but also many obstacles such as garbage, dead leaves, and plants. If these particles enter the pipeline 3, the pipeline 3 may be clogged and the water flow 15 may be obstructed. This is the reason why the screen 11 is installed. It should be noted that the installation of the screen 11 is not intended to "remove" falling objects and obstacles such as dust, dead leaves, plants, etc., but to "avoid or dodge" falling objects and obstacles. As described above, if the screen 11 is bent into a streamline shape that can "avoid/dodge" falling objects and obstacles such as a substantially V-shaped screen, the flow of water is not hindered.

The structure of the screen 11 is not particularly limited, but it may be formed of a mesh-like member, or may be formed of a slit-like member as shown in FIG. In any case, it is preferable to have a configuration that prevents the entry of obstacles such as dust, dead leaves, plants, etc., even if the entry of water is possible.

As described above, as shown in FIG. 5, the screen 11 is bent in a substantially V-shape so as to surround the tip opening 9 of the tributary pipe section 7, so that even if the obstacle or the like collides therewith, the screen 11 can be easily bent to both sides. It is preferably installed so that it can be moved. Further, not only one screen 11 but also double or triple screens 11 may be installed. In this case, the mesh size of the screen 11 is changed so that the screen 11 installed on the outermost side has a larger mesh, and the next screen 11 has a smaller mesh. For the screen 11 close to , a screen with even smaller stitches is used. As described above, when a plurality of screens 11 are installed, it is possible to substantially prevent the entry of obstacles such as dust, dead leaves, plants, and falling objects.

FIG. 6 shows an installation example of the screen 11 when the pipelines 3 are installed on the river side walls of the main stream 1 and the branch stream 2 . As shown in FIG. 6, a flat screen 11 is arranged so as to be inclined from the river side wall 17 toward the direction of water flow 15 . Even if the screen 11 is installed as shown in FIG. 6, it is possible to prevent obstacles such as garbage, dead leaves, plants, etc., and the intrusion of the falling matter into the pipe line 3 .

It should be noted that the screen 11 may be arranged in the air during normal times, and arranged so as to face the tip opening 9 of the branch pipe section 7 when the backwater phenomenon occurs. By configuring as described above, the maintenance of the screen 11 can be simplified and the durability of the screen 11 can be improved.

A fourth embodiment will now be described with reference to FIG.
FIG. 8 shows an example in which the tributary pipeline section 7 of the pipeline 3 is installed on the river side wall surface 17 of the tributary 2 . A normal water level 18 and a dangerous water level 19 are set for the main stream 1 or the branch stream 2 . Here, in this embodiment, the pipeline 3 is installed above the normal water level 18 . That is, when the normal water level is 18, the pipeline 3 does not exist in the water. However, when heavy rain or the like occurs, the water level of the main stream 1 rises, and the water level of the tributary stream 2 rises to 18 or more in normal times, the pipeline 3 is submerged, and the second The backwater phenomenon can be eliminated by functioning in the same manner as the pipeline 3 of the first to third embodiments.

In this embodiment, the pipeline 3 may be installed at any position between the normal water level 18 and the dangerous water level 19 . However, if it is installed at a place just above the normal water level 18, the water pressure increases, so that the flow of water passing through the pipeline 3 becomes stronger, and the drainage power from the branch 2 to the main stream 1 can be strengthened. On the other hand, if it is installed immediately below the danger water level 19, the water pressure will be low because it is approaching the rising water surface, and the flow of the water flow passing through the pipeline 3 will be weak. Therefore, the drainage force from the branch stream 2 to the main stream 1 is weak.

In the fourth embodiment, the pipeline 3 is installed above the normal water level 18 . As a result, there is an advantage that the maintenance of the pipeline 3 can be simplified. When the pipeline 3 is installed in water, deposits continue to increase in the pipeline 3 and at the tip opening 9 of the tributary pipeline section 7 serving as the water intake, and there is a high possibility that the flowing material will remain. Then, the work of removing it becomes extremely complicated, resulting in a high cost.

In addition, work outside water is safer than work under water, and work efficiency during construction is also improved. Furthermore, construction costs and maintenance costs can be reduced. Moreover, deterioration of pipes, fasteners, and the like can be prevented. In this way, it is a timely response type system that needs to function only when the water level rises and does not need to function during normal times.

Considering the backwater countermeasure function of the pipeline 3, it is preferable to install it at a location as close to the dangerous water level 19 as possible. This is because the function of draining water from the branch 2 side of the pipeline 3 to the main stream 1 side is weakened.

Therefore, the pipeline 3 is installed on the river side wall 17 so as to move vertically between a point just above the normal water level 18 and a point just below the dangerous water level 19 . That is, normally, the pipeline 3 is arranged below the dangerous water level 19, and when the backwater phenomenon occurs due to strong rainfall, the pipeline 3 is moved to the upper side of the normal water level 18 to function. of.
With such a mechanism, both the merit of installing directly above the normal water level 18 and the merit of installing directly below the dangerous water level 19 can be obtained.

Here, the method of installing the pipeline 3 on the river side wall surface 17 is not limited at all. do not have. Moreover, the method is not limited at all also about the movable type mentioned above. For the tip opening 9 of the tributary pipe section 7 that serves as the water intake, the pipe line 3 using flexible pipe is installed in the vicinity of the danger water level 19 in normal times, and is moved to the position directly above the water level 18 in normal times when the water increases. I don't mind.
Alternatively, a structure may be employed in which a plurality of conduits 3 are used and moved up and down at the same time by adopting a chamber merging system.

As described above, when the water flow 15 is increased using the pump 16, the main flow pipeline section 8 of the pipeline 3 can be extended to the downstream near the sea, or the rear end of the main flow 1 can be extended. It is also possible to expose the opening 10 not in the water of the main stream 1 but in the air for drainage.

Reference Signs List 1 main stream 2 tributary stream 3 pipeline 4 confluence point 7 tributary pipeline section 8 main stream pipeline section 9 front end opening 10 rear end opening 11 screen 12 diffuser 13 main body 14 flange 15 water flow 16 pump 17 river Side wall surface 18 Normal water level 19 Dangerous water level 20 Main pipeline

Claims (8)

A waterway system for countermeasures against backwater using a pipeline arranged in the main stream passing through a confluence point from a tributary to the main stream,
The pipeline has a tributary pipeline portion arranged in the tributary stream and a main stream pipeline portion arranged in the main stream, and the tributary pipeline portion has a longitudinal direction that corresponds to the water flow of the tributary stream. Using a pipeline that is installed in parallel, passes through the point of confluence with the main stream, and is connected to the main stream pipeline part that is installed in parallel with the flow of water in the main stream,
A channel system for backwater countermeasures characterized by:
The pipeline is installed at an aerial position above the normal water level of the river,
The waterway system for countermeasures against backwater according to claim 1, characterized in that:
The pipeline is attached to the side wall surface of the river,
3. The waterway system for countermeasures against backwater according to claim 1 or 2, characterized in that:
The pipeline is attached to the side wall surface of the river so as to be movable in the vertical direction from the normal water level to the dangerous water level.
3. The waterway system for countermeasures against backwater according to claim 1 or 2, characterized in that:
A waterway system for countermeasures against backwater using a pipeline arranged in the main stream passing through a confluence point from a tributary to the main stream,
The pipeline attached to the side wall surface of the river has a tributary pipeline section arranged in the tributary and a main stream pipeline section arranged in the main stream, and the tributary pipeline section is the longitudinal direction of the tributary pipeline section. Using a pipeline that is installed so that the direction is parallel to the flow of water in the tributary stream, passes through the confluence point with the main stream, and is connected to the main stream pipeline part that is installed so as to be parallel to the flow of the main stream. and
Furthermore, the pipeline is attached to the side wall of the river so as to be movable in the vertical direction from the normal water level of the river to the dangerous water level.
A channel system for backwater countermeasures characterized by:
A water channel system for countermeasures against backwater using a pipeline arranged in the water of the main stream, passing through the water at the confluence point from the water in the tributary to the main stream,
The pipeline has a tributary pipeline portion arranged in the tributary stream and a main stream pipeline portion arranged in the main stream, and the tributary pipeline portion has a longitudinal direction that corresponds to the water flow of the tributary stream. It is installed in parallel and is connected to the main stream pipe section installed in the direction parallel to the main stream water flow through the confluence point with the main stream,
A channel system for backwater countermeasures characterized by:
Diffusers for increasing water flow in the pipeline are attached to the front end opening and the rear end opening of the pipeline,
The waterway system for countermeasures against backwater according to claim 6 , characterized in that:
A screen is provided in front of the opening at the tip of the pipe to avoid obstacles and fluids flowing in the river and allow only water to flow into the pipe.
The waterway system for countermeasures against backwater according to claim 6 or 7 , characterized in that:

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