JP2003289732A - Water-intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-intake device by which not only penetration of refuses to a pipeline but also inflow of air, and earth and sand are blocked while requiring almost no maintenance, and which enables the water-intake and water supply to be carried out stably for a long period. <P>SOLUTION: The water-intake device for supplying water flowing in a supply channel to the pipeline laid on a field has a water-intake pipe 21 horizontally installed in the interior of a water-intake pit 20 having a water-inflow part 19 into which the water flows from the supply channel, and a plurality of water- intake holes 28 having ≤50 mm, preferably ≤30 mm maximum opening size formed at the periphery of the lower part of the water-intake pipe 21. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water intake device,
More specifically, the present invention relates to a water intake device used to take water from a water supply channel and supply it to a water supply pipeline laid in a paddy field or an underdrain water supply pipe for underground irrigation.

[0002]

2. Description of the Related Art In recent years, as a means for supplying water to paddy fields and the like, in many cases, a pipeline buried in the ground has been used instead of a conventional open channel. Further, also in the field cultivation, underground irrigation is being widely practiced in which a underground conduit water pipe is buried underground to adjust the groundwater level to a level suitable for crops.

[0003]

[Problems to be Solved by the Invention] When water is supplied to the above-mentioned pipeline or underdrain water pipe from a main water supply channel, etc., grass and wood scraps, plastic trash, empty cans, empty bottles, etc. may be taken together with the water during water intake When dust enters, the pipeline and the underdrain water supply pipe may be blocked, and the operation of valves and the like may be hindered. Therefore, conventionally, a dust remover is provided in the water supply passage to remove dust, but when the dust remover is installed, not only the installation cost but also a large amount of operation and maintenance cost and labor are required. There is a problem.

Further, when air flows into the pipe, iron contained in the groundwater reacts with oxygen in the air to produce iron oxide, and the iron oxide adheres to the pipe and valve to cause clogging. Cause. In addition, when rice husks are used as a hydrophobic material in the underdrain drainage, the rice husks are corroded early by the contact with the air that has entered the pipeline, and the water permeability of the hydrophobic material is reduced, and the drainage function is impaired. There are also problems.

Therefore, the present invention can prevent not only the invasion of dusts into the pipeline but also the inflow of air and the inflow of earth and sand, and almost no maintenance is required, and stable intake and water supply for a long period of time. It is intended to provide a water intake device that can obtain performance.

[0006]

In order to achieve the above object, a water intake device of the present invention is a water intake device for supplying water flowing through a water supply channel to a pipeline laid in a field. The intake pipe is installed horizontally inside the intake basin equipped with a water inflow part through which the maximum amount of opening is 50 m on the lower peripheral surface of the intake pipe.
A plurality of water intake holes of m or less, preferably 30 mm or less are formed, and further, an air valve is provided on the upper part of the water intake pipe.

The water intake device of the present invention has, as a second structure, a water intake pipe having a water inflow section into which water from the water supply channel flows, and the water intake pipe is installed vertically in the water intake pipe. The maximum opening size is 50 mm on the peripheral surface of
In the following, preferably, a plurality of water intake holes each having a size of 30 mm or less are formed, and further, the water intake pipe is detachably attached to a water supply port opened upward to a bottom portion of the water intake basin. .

[0008]

1 to 3 show a first embodiment of a water intake device according to the present invention. FIG. 1 is a sectional front view, and FIG.
Is a sectional side view, FIG. 3 is a partially cutaway plan view, and FIG. 4 is a schematic plan view showing an example of a field (paddy) to which the water intake device of the present invention can be applied.

First, as shown in FIG. 4, the inside of the paddy field 10 which is a field is divided into a plurality of cultivated sections 12 by a ridge 11 extending in the lateral direction. Farm roads 13 are provided along the longitudinal direction. Each farm road 13 is provided with a water supply channel 14 connected to the main water supply channel and a drainage channel 15 connected to the main drainage channel. The water supply channel 14 and the drainage channel 15 do not necessarily have to be provided along the farm road 13, but may be provided along the ridge 11 or at other locations as necessary.

Further, a plurality of underdrain water pipes 16 made of perforated pipes are buried underground in each cultivated area 12,
The upstream side of the underdrain water supply pipe 16 is connected to a water intake device 17 provided in the water supply passage 14 via a pipeline 22, and the downstream side is connected to the drainage passage 15 via a drainage device 18. Depending on the installation location of the water supply channel 14 and the drainage channel 15, the water intake device 17 and the drainage device 18 may be installed in the cultivation area 1.
It can also be installed adjacent to one side of 2, or integrally formed. Further, an appropriate number of underdrain water supply pipes 16 can be buried in one cultivated area according to the situation of the cultivated area 12, and all the upstream sides of each underdrain water supply pipe 16 are connected to the water intake device 17. You don't have to. Furthermore, it is preferable to use a drainage device 18 having a structure in which air does not enter the underdrain water passage pipe 16, and it may be a simple lock bar, which has a water level adjusting function for adjusting the water level in the cultivated area. You can also use your own drainage system.

In the water intake device 17, an intake pipe 21 is installed inside an intake basin 20 having a water inflow portion 19 into which water from the water supply passage 14 flows, and the water intakeed by the intake pipe 21 is used in the pipeline. It is formed so as to supply the underdrain water supply pipe 16 via 22. Further, the intake basin 20 is provided with a mud discharge valve 23 for discharging the earth and sand and dust that have flowed into the intake basin 20.

Intake basin 20 of the water intake device shown in FIGS. 1 to 3.
Is the water inlet portion 19 at the upper portion of the side wall of the box body formed in the shape of a rectangular box, the water outlet portion 24 for letting out excess water to the downstream side, and the overflow weir 25 for discharging floating dust. And a drainage pipe 26 provided with the drainage valve 23 at the bottom of the cell. The drainage pipe 27 from the overflow weir 25 is the same as the drainage pipe 23 of the drainage pipe 23. It is connected to the downstream side.

The water intake pipe 21 is provided horizontally in the middle or upper portion of the water intake basin 20 in the vertical direction, and has one end closed and the other end connected to the rising pipe of the pipeline 22. . Then, on the lower peripheral surface of the intake pipe 21, the water in the intake basin 20 is taken into the intake pipe 21, and the underdrain water supply pipe 16 is introduced through the pipeline 22.
Is provided with a plurality of water intake holes 28.

Although the diameter of the intake pipe 21 is arbitrary, a pipe having the same size as the pipe forming the pipeline 22 may be used. Further, the water intake pipe 21 can be formed by forming a water intake hole 28 in a normal pipe, or can be formed by closing a hole in an unnecessary portion of a perforated pipe. The installation height is
It should be set at a position where it is possible to prevent the suction of air from the water surface and the suction of floating debris, and also to prevent the suction of the sediment that accumulates at the bottom of the box. Therefore, the depth of the intake box 20 should also meet these conditions. Should be considered.
Generally, the distance between the upper surface of the pipe and the water surface is 150 to 25
0 mm, the distance between the bottom of the pipe and the bottom of the box is 400-600
It is preferable to set it within the range of mm.

The water intake hole 28 is formed in such a size that the dust contained in the water does not flow into the water intake pipe 21 and is not easily clogged. The maximum opening size of 28 is usually 50 mm
Below, preferably 30 mm or less is appropriate. By forming the water intake hole 28 small, it is possible to more reliably prevent the inflow of dusts, but if it is made too small,
Not only is the water intake insufficient, but clogging tends to occur.

The number of water intake holes 28 to be installed is set according to the size of each hole and the amount of water intake, and may be calculated based on the total opening area and the flow velocity at each water intake hole 28. That is, when the flow velocity in the water intake hole 28 becomes high, the possibility of sucking in dusts and the like increases,
For example, the flow velocity in each water intake hole 28 may be set to 0.3 m / sec or less, and the size and the number of water intake holes 28 may be set so that the flow rate set below this flow velocity can be taken.

Further, although the shape of the water intake hole 28 is usually circular, it may be formed in an elliptic system or a slit shape.
Each intake hole 2 in the length direction and the circumferential direction of the intake pipe 21.
The shape and size of 8 may be different. The intake hole 28 should be provided on the peripheral surface below the center in order to avoid intake of air and floating dust, but depending on the distance from the water surface in the intake basin 20, the intake hole 28 may be provided on the upper peripheral surface. Good.

The length of the water intake pipe 21 can be set according to conditions such as the amount of water intake, but if it is too long with respect to the diameter, it becomes difficult to take water from the water intake hole 28 at the tip portion. Therefore, in such a case, a plurality of water intake pipes 21 having an appropriate length may be provided in parallel.

Further, in order to prevent air from accumulating in the intake pipe 21, it is preferable to provide an air valve or an air vent on the upper surface of the intake pipe 21. As the air valve, a normal automatically operated air valve provided in various pipelines can be used.

By forming the water intake device 17 in this manner, it is possible to prevent not only dust and earth and sand but also air from flowing into the pipeline 22 and the underdrain water pipe 16. Therefore, the pipeline 22 and the underdrain can be prevented. It is possible to prevent the water passage pipe 16 from being blocked or to hinder the operation of the valve or the like, and to suppress the generation of iron oxide and the corrosion of the hydrophobic material.

FIG. 5 is a vertical sectional view showing a second embodiment of the water intake device of the present invention. The same components as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In this water intake device 50, a water intake pipe 53 having a plurality of water intake holes 52 formed on its peripheral surface is concentrically provided inside a water intake basin 51 formed of a cylinder whose axis is oriented vertically. The lower end of the water intake pipe 53 is attached to the end of the pipeline 22.

The water intake pipe 53 is composed of a pipe whose upper end opening has a length (height) protruding above the water surface, and the water intake holes 52 formed in the peripheral surface are the water intake holes of the first embodiment. The size and the number of installations are set under the same conditions as the holes 28, and further, the intake holes 52 at the bottom of the intake pipe 52.
Is provided at a position sufficiently higher than the bottom of the intake basin 52.

Also in the water intake device 50 thus formed, the water intake box 51 is provided from the water supply passage 14 via the water inflow portion 19.
The waste water that has flowed into the inside is separated by the water holes 52, and the sediment is separated by settling at the bottom of the box. Moreover, while preventing the intrusion of air, the water is supplied to the pipeline 22 in a stable state. Can be supplied.

In addition, the end of the pipeline 22 is connected to the water container 5
The water intake pipe 53 is detachably attached to the opening at the bottom of the pipe 2, and the water intake pipe 53 is removed from the opening as necessary to remove the water from the pipeline 22 or the underdrain water pipe. Since a large amount of water can be made to flow into 16 at a time, it is possible to perform a scavenging operation for discharging the earth and sand accumulated in these pipes. Further, by providing the shutoff valve 54 in the water inflow portion 19 and sealing the upper opening of the water intake basin 52 with the lid 55, it is possible to prevent air from flowing into the pipeline except when water is being taken in or when the water is being swept.

It should be noted that the intake basins 20 and 51 may be provided in the middle of the water supply passage 14 so that the water supply passage can also serve as the irrigation water inflow portion. Furthermore, in each of the above-described embodiments, the case where the water supply channel is an open water channel has been described, but even when the water supply channel is a pipeline, by providing the water intake device, It is possible to reliably separate dust and dirt.

[0027]

As described above, according to the water intake device of the present invention, it is possible to prevent the inflow of dust, earth and sand, and air into the pipeline, and moreover, there is almost no need for maintenance and maintenance for a long period of time. Stable water intake and water supply can be performed.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a first embodiment of a water intake device of the present invention.

FIG. 2 is a sectional side view of the same.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is a schematic plan view showing an example of a field (paddy) to which the present invention is applied.

FIG. 5 is a vertical cross-sectional view showing a second embodiment of the water intake device of the present invention.

[Explanation of symbols]

10 ... Paddy field, 11 ... Ridge, 12 ... Cultivation area, 13 ... Farm road,
14 ... water supply channel, 15 ... drainage channel, 16 ... underdrain water pipe,
17 ... Water intake device, 18 ... Drainage device, 19 ... Water inflow part,
20 ... Intake Masu, 21 ... Intake Pipe, 22 ... Pipeline, 23 ... Mud Valve, 24 ... Water Outflow Port, 25 ... Overflow Weir,
26 ... drainage pipe, 27 ... drainage pipe, 28 ... intake hole,
50 ... Water intake device, 51 ... Water intake box, 52 ... Water intake hole, 53 ...
Intake pipe, 54 ... Shut-off valve, 55 ... Lid

Claims (4)

[Claims] 1. A water intake device for supplying water flowing through a water supply channel to a pipeline laid in a field, wherein the water intake pipe is provided with a water inflow section into which water from the water channel flows. Is installed horizontally, and a plurality of water intake holes having a maximum opening size of 50 mm or less are formed on the lower peripheral surface of the water intake pipe. 2. The water intake device according to claim 1, wherein an air valve is provided above the water intake pipe. 3. A water intake device for supplying water flowing through a water supply channel to a pipeline laid in a field, wherein an intake pipe is provided inside an intake basin having a water inflow section into which the water from the water channel flows. A water intake device, which is installed in a vertical direction and has a plurality of water intake holes having a maximum opening size of 50 mm or less formed on a peripheral surface of the water intake pipe. 4. The water intake device according to claim 3, wherein the water intake pipe is detachably attached to a water supply port that is opened upward in a bottom portion of the water intake basin.