JP2007205116A - Drainage method and drainage apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage method and a drainage apparatus for discharging part of running water to the downstream side of a river through a discharge pipe communicating with the upstream side of the river, which method and apparatus enable smooth discharge of running water without using a pump. <P>SOLUTION: A running water storage unit 11 is provided as a storage tank annexed to the river 10 at its upstream side, where the running water storage unit 11 communicates with the river 10 through a pipe 12 and an L-shaped water absorption port 2, which is formed on the upper end of a closed pipe 1, is directed downward to face the interior of the water storage unit 11. A siphon pipe 5 is connected to the closed pipe 1 near the lower line of the siphon pipe 5. The siphon pipe 5 is so structured that a lower line pipe 7 has a sectional diameter larger than that of an upper line pipe 6, which allows the siphon pipe 5 to absorb and discharge water in the running water storage unit 11 utilizing a pressure difference in the closed pipe 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a drainage method and a drainage device that discharges a part of running water from a drainage pipe communicated on the upstream side of a river to the downstream of the river and the sea. A stable amount of water is always obtained, but heavy rain falls. It is used to prevent flooding in small and medium-sized rivers that may increase rapidly.

About this kind of drainage device, what was indicated in patent documents 1 is known.
In this document, a vertical shaft is connected to a discharge channel that is inclined underground, and drainage that exceeds a certain level of the river or drainage channel is guided from the vertical shaft to the discharge channel, and drained from the discharge channel to the river or the sea by a pump. The invention is disclosed.
However, the construction of the spillway in the basement is a very large construction, and the cost is also large. Further, since the water is drained from the discharge channel using a pump, there is a disadvantage that the operation timing becomes extremely difficult if the dry operation of the pump is suppressed.
Furthermore, if the pump is submerged due to flooding or flooding, the pump can no longer be used and may become unusable when it must operate.

The above-mentioned known technology mainly considers urban drainage systems. However, in small and medium rivers, flooding may occur due to sudden increase of water when heavy rain falls. It is possible to prevent flooding to some extent by excavating the bottom of the river and increasing the cross-sectional area of the channel. However, excavation of the bottom of the river brings backflow of seawater at high tide and causes problems in the estuary, so it cannot be implemented easily.
Japanese Patent Laid-Open No. 5-222760

  An object of the present invention is to enable smooth discharge without using a pump in a drainage method and drainage device for discharging a part of running water from a drain pipe connected to the upstream side of a river to the downstream side of the river. It is a thing.

The first technical means for solving this technical problem relates to the drainage method. (A) The upper end is exposed in the running water reservoir of the river and the cross-sectional diameter of the descending pipe is larger than the cross-sectional diameter of the ascending pipe. (Ii) using the pressure difference in the sealed pipe to suck and discharge the water in the running water storage section.
The second technical means is related to the drainage device. (C) The sealed pipe with the upper end facing the running water storage part of the river, (d) The sectional diameter of the descending pipe connected to the sealed pipe is the sectional diameter of the ascending pipe It consists of a larger siphon pipe, (e) an air vent valve attached to the bent part of the siphon pipe, and (f) an open / close valve attached to the descending pipe. (G) Using the pressure difference in the sealed pipe, It was that water was sucked and discharged.

In the present invention, the upper end of the sealed pipe is faced in the running water storage part of a river at a location where the possibility of flooding on the experience side is high or higher than that, and the water is taken downstream by a different route from the river. It will be released.
The running water storage part of the river includes a part where the river bottom has a predetermined depth, a dam-like depth formed by blocking the flow path of the river, or a storage tank formed in communication with the river.

A siphon pipe is connected to the sealed pipe, but the cross-sectional diameter of the descending pipe in the siphon pipe is configured to be larger than the cross-sectional diameter of the ascending pipe. Pressure is generated, and water in the running water reservoir is sucked at a high speed.
Therefore, a large amount of water can be smoothly discharged from the tip of the sealed tube without using a pump.

In the second technical means, since the air vent valve is attached to the top of the siphon tube, it can be easily deaerated even if air enters the tube, and the siphon effect is not lost.
In addition, since an on-off valve is attached to the descending pipe, it is possible to stop the discharge from the sealed pipe, or to adjust so that a small amount of water is always discharged. Can also be adjusted.
Therefore, when a sudden increase in water is expected, it can be discharged just by opening the on-off valve.

The material of the sealed tube is not limited as long as the sealed state can be maintained. A pipe made of synthetic resin can be preferably used.
This sealed tube may be arranged in an exposed state or embedded in the soil. When installing, it may be arranged along a route different from the river, or may be arranged along the river. If the location cannot be secured, it may be buried in the riverbed.
When the siphon tube is connected to the downstream side of the sealed tube, the height to the bent portion can be increased, so that the flow rate of water falling in the descending tube is increased, and the negative pressure in the ascending tube is correspondingly increased. It is possible to increase the suction power of the water in the running water storage section and to discharge the water more quickly. In this case, since the small-diameter pipe is installed downstream, the space can be used effectively and the working efficiency is good.

  If the height of the bent part of the pipe is lower than the position of the running water storage part, the water automatically reaches the position of the bent pipe by keeping the on-off valve or air vent valve open, and naturally descends. It will face the tube side. In that state, if the on-off valve is closed and the air vent valve is opened, the siphon tube can be filled with water by closing the pal part when the air is released. Preparation for release is completed.

  The downstream side of the river that is the discharge destination literally includes facilities such as the water purification plant arranged on the downstream side of the river, in addition to the downstream of the river itself that is not in danger of flooding. When discharged to a water purification plant, clean water with a low degree of contamination due to domestic wastewater can be supplied to the water purification plant, which has the advantage of reducing water purification costs.

  As a result of smoothly discharging river water without using a pump, there is an advantage that river water can be discharged naturally without using energy.

FIG. 1 is an overall schematic diagram for explaining the arrangement of the sealed tube 1, and FIG. 2 is a schematic diagram of a main part of the running water storage unit 11 and the siphon tube 5.
In this embodiment, the running water storage section 11 is configured by a storage tank provided on the upstream side of the river 10, the sealed pipe 1 is formed of polyethylene resin, and an example in which it is arranged by a route different from the river 10 is shown. Yes.
The running water storage unit 11 communicates with the river 10 through a pipe 12, and the L-shaped water inlet 2 formed at the upper end of the sealed pipe 1 faces the running water storage unit 11 in a downward state.

The siphon tube 5 is connected to the sealed tube 1 near the descending line. In this embodiment, the inner diameter of the ascending tube 6 of the siphon tube is set to 2 m, and the inner diameter of the descending tube 7 is set to 3 m so that the cross-sectional area of the descending tube 7 is It is configured to be slightly more than twice.
Reference numeral 8 denotes an air vent valve attached to the top of the bent portion of the siphon pipe 5, and reference numeral 9 denotes an on-off valve attached to the lower part of the descending pipe 7.

Overall schematic diagram for explaining the arrangement of sealed tubes Schematic diagram of main parts of running water reservoir and siphon tube

Explanation of symbols

1 sealed pipe, 2 water inlet, 5 siphon pipe, 6 ascending pipe, 7 descending pipe, 8 air vent valve, 9 open / close valve, 10 river, 11 running water storage section, 12 communication pipe

Claims (4)

In the drainage method in which a part of running water is discharged from the drain pipe connected on the upstream side of the river to the downstream side of the river, the cross-sectional diameter of the descending pipe is set to the sealed pipe with the upper end facing the running water storage part of the river. A drainage method in which siphon pipes larger than the cross-sectional diameter are connected, and the water in the running water storage section is sucked and discharged using the pressure difference in the sealed pipe. In a drainage device that discharges a part of running water from a drain pipe connected to the upstream side of the river to the downstream side of the river, a cross-section of the descending pipe by connecting the upper end to a sealed pipe facing the running water storage part of the river It consists of a siphon pipe whose diameter is larger than the cross-sectional diameter of the ascending pipe, an air vent valve attached to the top of the siphon pipe, and an on-off valve attached to the descending pipe. The water in the running water reservoir is sucked and discharged using the pressure difference in the pipe. Drainage device that was made to do. The drainage device according to claim 2, wherein a siphon tube is disposed downstream of the sealed tube. The drainage device according to claim 2 or 3, wherein the height of the bent portion of the siphon tube is lower than the position of the running water storage portion.

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