JP2004242562A - Water supply device in underground irrigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground irrigation system for securely performing underground irrigation through preventing accumulation of earth and sand into an underdrainage pipe (a perforated pipe) even when a lot of earth and sand are contained in water, and facilitating maintenance work. <P>SOLUTION: This underground irrigation system is provided burying the perforated pipe 23 under the ground of a rice paddy (a tillage area 13), installing a water level setting device 26 on a downstream side of the perforated pipe and setting up the water level of the paddy through adjusting a drainage water level with the water level setting device. Furthermore, a sedimentation tank 24 to sediment and separate earth and sand contained in water from a water supply channel 14 is set on the midway of a path to supply the water to the perforated pipe. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water supply device in an underground irrigation system, and more particularly, to a perforated pipe in an underground irrigation system for setting a groundwater level or a surface water level in a field by adjusting a drainage water level from a perforated pipe buried underground. The present invention relates to an apparatus for supplying water to water.
[0002]
[Prior art]
Underground irrigation, which has been practiced in recent years, replenishes water by capillary action by adjusting the groundwater level in the field during upland cultivation, and improving the yield by adjusting the groundwater level to a water level suitable for crops. The effect can be obtained. In this underground irrigation, a culvert drainage pipe consisting of a perforated pipe is buried in the ground of the field to discharge the excess groundwater underground to the drainage channel, and to supply insufficient water using the culvert drainage pipe. Is common (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-155375 (page 2, FIG. 1, FIG. 2)
[0004]
[Problems to be solved by the invention]
In underground irrigation as described above, depending on the local conditions of the field, the supplied irrigation water may contain a large amount of dirt and earth and sand. There is a possibility that water will accumulate and impede the water flow performance. Therefore, when using irrigation water containing a large amount of soil and the like for underground irrigation, it was necessary to install a fine filter at a portion where the irrigation water is taken into the underground irrigation system from the water supply channel. However, if such measures are taken, maintenance requires much labor.
[0005]
Therefore, the present invention can prevent the accumulation of sediment and the like in the culvert drainage pipe (perforated pipe) even when the service water contains a large amount of sediment and the like, and perform reliable underground irrigation, and also facilitate maintenance work. It is an object of the present invention to provide a water supply device for an underground irrigation system that can be performed in a country.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the water supply device in the underground irrigation system of the present invention embeds a perforated pipe in the ground of a field and installs a water level setting device downstream of the perforated pipe, In the underground irrigation system for setting the water level of the field by adjusting the drainage water level by, in order to settle and separate the sediment contained in the water, on the way to supply the water from the water supply channel to the perforated pipe Is provided.
[0007]
Further, the sedimentation tank is provided with a drainage pipe for discharging sediment deposited at the bottom, and the sedimentation tank is provided with a baffle plate for controlling a flow of water. .
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of a water supply device in an underground irrigation system of the present invention. FIG. 1 is a sectional view of the underground irrigation system, FIG. 2 is a schematic plan view showing a piping system in the underground irrigation system, and FIG. It is sectional drawing which shows an example of a tank.
[0009]
First, as shown in FIG. 1 and FIG. 2, the inside of the field is divided into a plurality of cultivation areas 13 by farm roads 11 and ridges 12, one of the farm roads is provided with a water supply channel 14, and the other is provided with a water supply channel 14. A drainage channel 15 is provided in the farm road, and an underground irrigation system is provided in each cultivation zone 13. In addition, the water supply channel and the drainage channel can be provided at an arbitrary position according to the situation of the field, and may be provided at a ridge portion.
[0010]
In the underground irrigation system, a plurality of perforated pipes 23 having both ends connected to a water supply collecting pipe 21 and a drainage collecting pipe 22 are buried in parallel in the ground of the cultivation area 13 at equal intervals, and the water supply collecting pipe 21 is buried. The pipe 21 is provided with a water supply pipe 25 connected to the water supply path 14 via a sedimentation tank 24, and the drainage pipe 22 is provided with a drainage pipe 27 reaching the drainage path 15 via a water level setting device 26. It is provided so that the water level of each cultivation area 13 can be set arbitrarily by adjusting the drainage water level from the cultivation area 13 by the water level setting device 26.
[0011]
The sedimentation tank 24 is provided with an inflow opening 29 to which a water intake pipe 28 opening to the water supply passage 14 is connected and an outflow side opening 30 to which the water supply pipe 25 is connected at the top of the tank, and a sedimentation tank at the bottom of the tank. Is provided with a mud discharge port 32 for connecting a mud discharge pipe 31 for discharging the sediment discharged, and the flow velocity of the water flowing in from the inflow side opening 29 and flowing out from the outflow side opening 30 can be settled. It has a size that can be slowed down sufficiently within a reasonable range. Further, as shown in FIG. 3, by providing one or more baffles 33 for controlling the flow of the water inside the sedimentation tank 24, the water containing the soil and the like flows from the inflow side opening 28. It can be prevented from flowing in a state of being short-circuited to the outflow side opening 29, and sedimentation and separation of soil can be performed more effectively.
[0012]
The intake of the intake pipe 28 can be provided with a coarse filter 34 for separating coarse dust that may be clogged in the piping path, and a valve or a weir for adjusting the intake amount can be provided. It is also possible to provide a flow rate confirmation means for confirming the water intake amount. It is desirable that the upper opening of the sedimentation tank 24 be closed with a lid.
[0013]
In this way, by providing the sedimentation tank 24 in the middle of the path for supplying the water from the water supply channel 14 to the perforated pipe 23, sediment and the like in the water can be settled and separated in the sedimentation tank 24. It is possible to prevent earth and sand from flowing into the perforated pipe 23 from the pipe 25 together with the water. Thus, even when used for a long time, sediment and the like do not accumulate in the perforated pipe 23 and hinder the water passage performance of the perforated pipe 23.
[0014]
Therefore, it is not necessary to install a fine filter in the water intake, so that it is possible to omit daily maintenance and inspection work, and it is possible to save labor for agricultural work.
[0015]
The sediment or the like settled in the sedimentation tank 24 is removed from the sedimentation tank 24 by removing the water stopcock 35 provided so as to close the drainage port 32 and communicating the interior of the sedimentation tank 24 with the drainage pipe 31. The sediment sedimented at the bottom of the tank together with the water can be drained from the drainage pipe 31 toward the drainage channel 15. Note that a valve or a water lock 36 may be provided in the middle of the drainage pipe 30 instead of the water stopcock 35, or a waterstop cap may be screwed into an end of the drainage pipe 31. Further, the earth and the like may be sucked and discharged together with the water in the sedimentation tank 24 by a pump without providing the mud outlet 32, or the earth and the sand may be manually scraped out.
[0016]
Further, the sedimentation tank 24 can be formed by using one or more square or circular measures, but a large-diameter pipe may be installed horizontally along the farm road 11 or the ridge 12. .
[0017]
The operation of setting the water level by the water level setting device 26 can be performed in the same manner as in the related art, and thus a detailed description thereof will be omitted. The structure of the water level setting device 26 is arbitrary, and the setting range of the water level is also arbitrary.
[0018]
【The invention's effect】
As described above, according to the underground irrigation system of the present invention, even if the irrigation water supplied from the water supply channel contains much sediment, the sediment can be settled in the sedimentation tank and separated from the irrigation water. Since it is possible, soil and the like can be prevented from flowing into the perforated pipe for performing underground irrigation, and reliable underground irrigation can be performed for a long period of time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of an underground irrigation system to which the present invention is applied.
FIG. 2 is a schematic plan view showing a piping system in an underground irrigation system to which the present invention has been applied.
FIG. 3 is a sectional view showing an example of a sedimentation tank.
[Explanation of symbols]
11 ... farm road, 12 ... ridge, 13 ... cultivation area, 14 ... water supply channel, 15 ... drainage channel, 21 ... water supply collecting pipe, 22 ... drainage collecting pipe, 23 ... perforated pipe, 24 ... sedimentation tank, 25 ... water supply pipe, 26 ... water level setting device, 27 ... drain pipe, 28 ... intake pipe, 29 ... inflow side opening, 30 ... outflow side opening, 31 ... mud pipe, 32 ... mud outlet, 33 ... baffle plate, 34 ... filter, 35 ... water stopcock, 36 ... water lock

Claims (3)

In an underground irrigation system for burying a perforated pipe in the ground of a field and installing a water level setting device on the downstream side of the perforated pipe, and adjusting the drainage water level by the water level setting device to set the water level of the field, A water supply device for an underground irrigation system, comprising: a sedimentation tank for sedimentation and sedimentation of sediment contained in the water in the middle of a path for supplying water from a water supply channel to the perforated pipe. The water supply device for an underground irrigation system according to claim 1, wherein the sedimentation tank is provided with a drainage pipe for discharging sediment deposited at a bottom portion. The water supply device for an underground irrigation system according to claim 1, wherein the sedimentation tank includes a baffle for controlling a flow of the water.

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