WO2018221155A1

WO2018221155A1 - Underground irrigation device

Info

Publication number: WO2018221155A1
Application number: PCT/JP2018/018189
Authority: WO
Inventors: 憲一塚本; 洋史浦部
Original assignee: デンカ株式会社
Priority date: 2017-05-31
Filing date: 2018-05-10
Publication date: 2018-12-06
Also published as: JP7085542B2; JPWO2018221155A1

Abstract

Provided is an underground irrigation device capable of uniformly supplying irrigation water to a plurality of culvert pipes buried in cultivated land and suppressing an uneven rise of the underground water level. This underground irrigation device can supply irrigation water to cultivated land 11 through a plurality of culvert pipes 10 by supplying the irrigation water to the plurality of culvert pipes which are buried in the cultivated land and branch from a main water supply pipe for supplying irrigation water, the underground irrigation device being provided with a water distribution member 3 which is connected between the main water supply pipe 2 and the plurality of culvert pipes 10, stores the irrigation water supplied from the main water supply pipe 2, and can supply the stored irrigation water to the plurality of culvert pipes 10 at the same water head pressure.

Description

Underground irrigation equipment

The present invention relates to an underground irrigation apparatus.

Underground irrigation that is being carried out in recent years is to replenish water by capillary action by adjusting the groundwater level of the field at the time of field cultivation, and by adjusting the groundwater level to a water level suitable for crops, etc. An effect can be obtained. In this underground irrigation, underground drainage pipes consisting of perforated pipes are buried in the ground of the field, and excess underground water in the ground is discharged into the drainage channel, and supply of insufficient water is also performed using the underground drainage pipes. Is common (see, for example, Patent Document 1).

In addition, water supply to the farm is generally performed by forced pumping by a pipeline or by natural pumping from an open channel (for example, see Non-Patent Documents 1 and 2).

JP 2004-242560 A

However, in the conventional underground irrigation system as described in Patent Document 1, a water supply pipe is arranged below the water supply, bent by an elbow, branched by a T-shaped pipe, and irrigation water is supplied to each underdrain pipe. Supply. Therefore, the supply resistance of the irrigation water to the underdrain pipe increases as the distance of the underdrain pipe increases from the water supply.

An example of a conventional underground irrigation system is shown in FIGS. 7 (a) and 7 (b). In the underground irrigation system shown in FIGS. 7 (a) and 7 (b), a water supply pipe 101 is disposed below the water supply tank 100, the water supply pipe 101 is bent by an elbow 102, and a T-shaped pipe 103 is provided downstream thereof. The example which connects and connects to each culvert tube 104 from there is shown. However, in such a conventional system, the supply amount of irrigation water tends to be smaller in the underdrain tube 104 connected to the end portion of the T-shaped tube 103. In particular, when natural pressure water supply is performed from an open channel, it is difficult to uniformly supply to the culvert tube side. As a result, uneven rise in the groundwater level may occur, resulting in differences in crop growth.

In view of the above problems, the present invention provides an apparatus for underground irrigation that can uniformly supply irrigation water to a plurality of culvert pipes embedded in a farm and can suppress uneven rise in groundwater level. To do.

In order to solve the above-described problem, in one aspect, the present invention provides a plurality of underdrain pipes by supplying irrigation water to a plurality of underdrain pipes that are branched from a main water supply pipe that supplies the irrigation water and embedded in a field. Is an underground irrigation device that can supply irrigation water to the field through the main irrigation pipe and is connected between a plurality of underdrain pipes and stores the irrigation water supplied from the main supply pipe, and the stored irrigation water A device for underground irrigation comprising a water distribution member capable of supplying a plurality of underdrain pipes with the same head pressure is provided.

In one embodiment, the apparatus for underground irrigation according to the present invention includes a plurality of outlets respectively connected to the plurality of underdrain pipes, and a storage unit that stores irrigation water below the plurality of outlets. The irrigation water stored in the storage part is caused to flow out from the plurality of outlets to the plurality of underdrain pipes by overflow.

In another embodiment of the apparatus for underground irrigation according to the present invention, the underdrain pipe located at the position farthest from the water distribution member is connected to the outlet at the position closest to the main water supply pipe, and is located closest to the water distribution member. A culvert pipe connected to an outlet located farthest from the main water supply pipe.

In yet another embodiment, the underground irrigation apparatus according to the present invention is provided such that the center of the plurality of outlets provided in the water distribution member is lower than the center of the inlet of the water distribution member.

In another aspect of the present invention, when supplying water for irrigation provided in a field, a main water pipe connected to the downstream side of the water supply, and a plurality of water branches branched on the downstream side of the main water pipe A pipe, a plurality of perforated pipes connected to the downstream side of the plurality of water supply branch pipes, a drainage branch pipe connecting the plurality of perforated pipes on the downstream side of the plurality of perforated pipes, and a downstream side of the drainage branch pipe Is connected between the main water supply pipe and the plurality of water supply branch pipes, and is supplied with water from the main water supply pipe. There is provided an underground irrigation apparatus including an irrigation water and a water distribution member capable of supplying the stored irrigation water to a plurality of water supply branch pipes with the same head pressure.

In one embodiment of the apparatus for underground irrigation according to the present invention, the water distribution member includes a plurality of outlets respectively connected to the plurality of water supply branch pipes, and a storage part for storing irrigation water below the plurality of outlets. The irrigation water stored in the storage section is caused to flow out from the plurality of outlets to the plurality of water supply branch pipes by overflow.

In another embodiment of the apparatus for underground irrigation according to the present invention, the water supply branch pipe connected to the upstream side of the perforated pipe located farthest from the water distribution member is the flow located closest to the main water supply pipe. A water supply branch pipe connected to the outlet and connected to the upstream side of the perforated pipe located closest to the water distribution member is connected to the outlet located farthest from the main water supply pipe.

In another embodiment of the apparatus for underground irrigation according to the present invention, one perforated pipe is connected to one water supply branch pipe connected to the water distribution member.

In a further embodiment, the underground irrigation apparatus according to the present invention is adjusted so that the diameter of the water supply branch pipe and the diameter of the perforated pipe are the same.

In another embodiment, the underground irrigation apparatus according to the present invention supplies water, but includes a water supply tank capable of switching between supply of water to the field and supply to the underground irrigation.

According to the present invention, it is possible to provide an irrigation apparatus for underground irrigation that can uniformly supply irrigation water to a plurality of culvert pipes embedded in a field, and can suppress uneven rise in groundwater level.

It is explanatory drawing showing an example of the apparatus for underground irrigation which concerns on embodiment of this invention, Fig.1 (a) shows a schematic plan view, FIG.1 (b) shows a schematic sectional drawing. It is a schematic plan view which shows another example of the apparatus for underground irrigation which concerns on embodiment of this invention. It is a side view which shows an example of the water distribution member which concerns on embodiment of this invention. It is a schematic plan view showing the modification of the apparatus for underground irrigation which concerns on embodiment of this invention. It is a schematic plan view showing another modification of the apparatus for underground irrigation which concerns on embodiment of this invention. It is explanatory drawing showing the example of a switching of the water supply to the rice field using the switching means with which a water supply is provided, and the water supply to the underground culvert for underground irrigation. It is the schematic which shows the example of the conventional underground irrigation system, Fig.7 (a) is a schematic plan view, FIG.7 (b) shows a schematic sectional drawing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention specifies the structure, arrangement, etc. of components as follows. Not what you want.

As shown in FIGS. 1A and 1B, the underground irrigation apparatus according to the embodiment of the present invention branches from a main water supply pipe 2 that supplies irrigation water and is embedded in a field 11. This is an underground irrigation device that can supply irrigation water to the field 11 through the plurality of culvert tubes 10 by supplying irrigation water to the plurality of culvert tubes 10.

A water supply 1 for supplying irrigation water to the main water supply pipe 2 is connected to the upstream side of the main water supply pipe 2. A water distribution member 3 for supplying irrigation water from the main water supply pipe 2 to the plurality of underdrain pipes 10 is connected between the main water supply pipe 2 and the plurality of underdrain pipes 10. The water distribution member 3 is made of a highly corrosion-resistant material such as synthetic resin or stainless steel, and has a storage portion 32 for storing irrigation water supplied from the main water supply pipe 2 at the bottom, and the irrigation water stored in the storage portion 32. Can be supplied to a plurality of culvert tubes 10 with the same water head pressure.

Specifically, as shown in FIG. 3, for example, the water distribution member 3 can include a plurality of

outlets

31a, 31b, and 31c connected to the plurality of underdrain pipes 10, respectively. In the example of FIG. 2,

outlets

31 a, 31 b, 31 c, 31 d, 31 e, and 31 f are horizontally provided at approximately the same height at six places on both side portions of the water distribution member 3. The number of

outflow ports

31a, 31b, 31c, 31d, 31e, 31f is not particularly limited, and for example, 3 to 12, preferably 4 to 8, can be provided.

The center heights of the plurality of

outlets

31a, 31b, 31c, 31d, 31e, 31f provided in the water distribution member 3 are provided so as to be lower than the center height of the inlet 20 of the water distribution member 3, respectively. Is preferred. For example, as shown in FIG. 3, a center line (AA line in FIG. 3) defined to be a horizontal line passing through the centers of the plurality of

outlets

31a, 31b, 31c is distributed from the main water supply pipe 2 to the water distribution member. 3 is provided so that its position is lower than the center of the inlet 20 (line BB in FIG. 3). Thereby, it becomes easy to supply irrigation water from the main water supply pipe 2 to the

outflow ports

31a, 31b, 31c, 31d, 31e, and 31f of the water distribution member 3.

The water distribution member 3 receives the irrigation water stored in the storage unit 32 that temporarily stores the irrigation water supplied from the main water supply pipe 2 below the plurality of

outlets

31a, 31b, 31c, 31d, 31e, and 31f. The plurality of

outlets

31a, 31b, 31c, 31d, 31e, 31f are allowed to flow out to the plurality of underdrain pipes 10 by overflow.

By supplying the irrigation water stored in the storage part 32 by overflow from a plurality of

outlets

31a, 31b, 31c, 31d, 31e, 31f arranged at substantially the same height (depth in the ground), The head pressure of the irrigation water flowing out from the

outlets

31a, 31b, 31c, 31d, 31e, 31f is the same. Thereby, regardless of the distance from the water distribution member 3 of the underdrain pipe 10, the supply resistance of the irrigation water can be made uniform among the plurality of underdrain pipes 10. That is, according to this embodiment, it is possible to uniformly supply irrigation water to the plurality of underdrain pipes 10 embedded in the farm field 11, and to suppress uneven rise in the groundwater level.

In the present embodiment, the “underdrain pipe 10” refers to a plurality of water

supply branch pipes

4a, 4b, 4c, 4d, 4e, and 4f that branch through the water distribution member 3 on the downstream side of the main water supply pipe 2, and a plurality of water supply A plurality of

perforated pipes

5a, 5b, 5c, 5d, 5e, 5f connected to the downstream side of the

branch pipes

4a, 4b, 4c, 4d, 4e, 4f, and a plurality of

perforated pipes

5a, 5b, 5c,

5d

5e and 5f, and a drainage branch pipe 6 that connects the plurality of

perforated pipes

5a, 5b, 5c, 5d, 5e, and 5f. The underdrain pipe generally means the generic name of the pipe buried in the ground, but the underdrain pipe 10 according to the present embodiment includes at least the water

supply branch pipes

4a, 4b, 4c, 4d, 4e, and 4f.

Perforated pipes

5a, 5b, 5c, 5d, 5e, 5f and drainage branch pipes 6 and, if necessary, pipes or the like buried in the ground are added to these as needed. It may be a concept. A main drain pipe 7 is connected to the downstream side of the drain branch pipe 6, and a water level-adjustable water pipe 8 is connected to the downstream side of the main drain pipe 7.

In the example of FIG. 2, the

perforated pipes

5 a and 5 f located farthest from the water distribution member 3 and the water

supply branch pipes

4 a and 4 f connected to the

perforated pipes

5 a and 5 f are located closest to the main water supply pipe 2. The

perforated pipes

5c and 5d connected to the

outlets

31a and 31f and located closest to the water distribution member 3 and the water

supply branch pipes

4c and 4d connected to the

perforated pipes

5c and 5d are the most connected from the main water supply pipe 2. It is connected to the

outflow ports

31c and 31d located at far positions.

Thus, any one of the

outlets

31 a, 31 b, 31 c, 31 d, 31 e, 31 f of the underdrain pipe 10 located relatively far from the water distribution member 3 is located relatively close to the main water supply pipe 2 of the water distribution member 3. And connecting the underdrain pipe 10 located relatively close to any of the

outlets

31a, 31b, 31c, 31d, 31e, 31f located relatively far from the main water supply pipe 2 of the water distribution member 3 By doing so, it is possible to uniformly supply irrigation water to the plurality of underdrain pipes 10 embedded in the field 11 and to suppress uneven rise in the groundwater level.

In the example of FIG. 2, an example is shown in which the water distribution member 3 is placed in the center, and the culvert pipe 10 is arranged symmetrically with respect to the water distribution member 3 from there, but as shown in FIG. Of course, it can also be arranged at the end of the field 11.

2 and 3 show an example in which one perforated pipe 5a is connected to one water supply branch pipe 4a of the underdrain pipe 10 connected to the water distribution member 3. As shown, a plurality of

perforated pipes

51c and 52c may be connected to one water supply branch pipe 4c, and a plurality of

perforated pipes

51d and 52d may be connected to one water supply branch pipe 4d.

The diameters of the water

supply branch pipes

4a, 4b, 4c, 4d, 4e, and 4f need to be substantially the same. Therefore, it is preferable that the diameters of the feed

water branch pipes

4a, 4b, 4c, 4d, 4e, and 4f and the bore diameters of the

perforated pipes

5a, 5b, 5c, 5d, 5e, and 5f are adjusted to be substantially the same size. More preferably, they are adjusted so as to have completely the same dimensions. Thereby, the water head pressure of each perforated pipe |

tube

5a, 5b, 5c, 5d, 5e, 5f can be made uniform.

As shown in FIG. 6, the water supply tank 1 is supplied with a water supply switching function capable of supplying the field 11 to the field and the underground irrigation water to the underdrain pipe of the field 11 by the switching means 93. It is preferable to provide.

For example, when the field 11 is used as a paddy field, the water supply tank 1 is buried in the ground from the water supply pipe 91 for supplying water to the paddy field of the field 11 and the paddle water supply pipe 91 for filling the paddy field. 11, an underground irrigation pipe 92 connected to the main water supply pipe 2, and a switching means 93 for switching water supply to the surface water supply pipe 91 and the underground irrigation pipe 92 as necessary.

When using the surface water supply pipe 91 to supply the surface of the field 11, for example, a switching plug as the switching means 93 is connected to the underground irrigation pipe 92 side (see the upper left figure in FIG. 6) to supply water in the water supply 1 Is supplied to Tanabe. When water is supplied to the underground irrigation pipe 92 side and supplied to the basement (underground irrigation equipment) of the field 11 by the culvert pipe 10, a switching plug as a switching means 93 is connected to the rice field water supply pipe 91 to supply water. Is supplied to the underground irrigation pipe 92.

According to the underground irrigation apparatus according to the embodiment of the present invention, the irrigation water supplied from the main water supply pipe 2 is stored, and the distributed irrigation water that can supply the stored irrigation water to the plurality of underdrain pipes 10 with the same head pressure By providing the member 3, irrigation water can be uniformly supplied to the plurality of underdrain pipes 10 embedded in the field 11, and uneven rise in the groundwater level can be suppressed.

As described above, the present invention has been described according to the above embodiment, but it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. Various alternative embodiments and operational techniques will become apparent to those skilled in the art from this disclosure, and in the implementation stage, modifications and embodiments can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Water supply 2 ... Main water supply pipe 3 ... Water distribution member 4a-4f ... Water supply branch pipe 5a-5f ... Perforated pipe 6 ... Drainage branch pipe 7 ... Main drainage pipe 8 ... Water level adjustment type water main pipe 10 ... Underdrain pipe 11 ... Field 20 ... Inlet 31a to 31f ... Outlet 32 ... Reservoir 91 ... Tank water supply pipe 92 ... Underground irrigation pipe 93 ... Switching means 101 ... Water pipe 102 ... Elbow 103 ... T-shaped pipe 104 ... Underwater pipe

Claims

A basement that can supply the irrigation water to the field through the plurality of underdrain pipes by supplying the irrigation water to a plurality of underdrain pipes that are branched from the main water supply pipe that supplies the irrigation water. An irrigation device,
Connected between the main water supply pipe and the plurality of underdrain pipes, stores the irrigation water supplied from the main water supply pipe, and supplies the stored irrigation water to the plurality of underdrain pipes at the same head pressure A device for underground irrigation comprising a possible water distribution member.
The water distribution member is
A plurality of outlets respectively connected to the plurality of underdrain pipes;
A reservoir for storing the irrigation water below the plurality of outlets,
The underground irrigation apparatus according to claim 1, comprising causing the irrigation water stored in the storage part to flow out from the plurality of outlets to the plurality of underdrain pipes by overflow.
The culvert pipe located at the position farthest from the water distribution member is connected to the outlet located at the position closest to the main water supply pipe, and the culvert pipe located at the position closest to the water distribution member from the main water supply pipe. The underground irrigation device according to claim 1, further comprising being connected to an outlet located at a farthest position.
The underground according to any one of claims 1 to 3, wherein a center of the plurality of outlets provided in the water distribution member is provided to be lower than a center of the inlet of the water distribution member. Irrigation equipment.
When supplying water to supply irrigation water provided in the field,
A main water pipe connected to the downstream side of the water tank;
A plurality of water supply branch pipes branching downstream of the main water supply pipe;
A plurality of perforated pipes connected to the downstream side of the plurality of water supply branch pipes;
A drainage branch pipe connecting the plurality of perforated pipes downstream of the plurality of perforated pipes;
A main drain pipe connected to the downstream side of the drain branch pipe;
A water level adjustable water pipe connected to the downstream side of the main drain pipe;
Connected between the main water supply pipe and the plurality of water supply branch pipes, storing irrigation water supplied from the main water supply pipe, and storing the stored irrigation water to the plurality of water supply branch pipes with the same head pressure A device for underground irrigation comprising a water distribution member that can be supplied.
The water distribution member is
A plurality of outlets respectively connected to the plurality of water supply branch pipes;
A reservoir for storing the irrigation water below the plurality of outlets,
The underground irrigation device according to claim 5, comprising causing the irrigation water stored in the storage unit to flow out from the plurality of outlets to the plurality of water supply branch pipes by overflow.
The water supply branch pipe connected to the upstream side of the perforated pipe located farthest from the water distribution member is connected to the outlet located closest to the main water supply pipe, and is located closest to the water distribution member The apparatus for underground irrigation according to claim 5 or 6, wherein the water supply branch pipe connected to the upstream side of the perforated pipe in the pipe is connected to an outlet located farthest from the main water supply pipe. .
The underground of any one of claims 5 to 7, wherein a center of the plurality of outlets provided in the water distribution member is provided to be lower than a center of the inlet of the water distribution member. Irrigation equipment.
The underground irrigation device according to any one of claims 5 to 8, wherein one perforated pipe is connected to one water supply branch pipe connected to the water distribution member.
The underground irrigation apparatus according to any one of claims 5 to 9, wherein the diameter of the water supply branch pipe and the diameter of the perforated pipe are adjusted to have the same dimension.
The apparatus for underground irrigation according to any one of claims 5 to 10, wherein the water supply includes a water supply tank capable of switching between supply of water to the field and supply to the underground irrigation.