JP7085542B2 - Underground irrigation equipment - Google Patents

Description

The present invention relates to an underground irrigation device.

Underground irrigation, which has been carried out in recent years, adjusts the groundwater level of the field during upland farming to replenish water by capillarity. The effect can be obtained. In this underground irrigation, an underdrain drainage pipe consisting of a perforated pipe is buried in the ground of the field, excess groundwater in the ground is discharged to the drainage channel, and insufficient water is supplied using the underdrain drainage pipe. Is common (see, for example, Patent Document 1).

Further, the water supply to the field is generally performed by forced pressure feeding by a pipeline or natural pressure feeding from an open channel (see, for example, Non-Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2004-242560

Supervised by the Structural Improvement Bureau of the Ministry of Agriculture, Forestry and Fisheries, "Land Improvement Project Design Standards Plan Dark Drainage Standards Technical Book", published by Agricultural Engineering Society, December 2000, pp. 126-128. Hokkaido Agricultural Administration Department "Guide for Underground Irrigation Using Centralized Control Holes", March 2008, pp. 1-22

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

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

In view of the above problems, the present invention provides an underground irrigation device capable of uniformly supplying irrigation water to a plurality of culvert pipes buried in a field and suppressing uneven rise in groundwater level. do.

In order to solve the above problems, the present invention has one aspect of the present invention by supplying irrigation water to a plurality of culvert pipes that are branched from the main water supply pipe that supplies irrigation water and are buried in the field. It is an underground irrigation device that can supply irrigation water to the field through the irrigation water. An underground irrigation device provided with a water distribution member capable of supplying water to a plurality of culverts with the same water head pressure is provided.

In one embodiment, the underground irrigation apparatus according to the present invention comprises a plurality of outlets in which a water distribution member is connected to a plurality of underdrain pipes, and a storage unit for storing irrigation water below the plurality of outlets. It includes draining the irrigation water stored in the reservoir from a plurality of outlets to a plurality of culvert pipes by overflowing.

In another embodiment of the underground irrigation device according to the present invention, the underdrain pipe located farthest from the water distribution member is connected to the outlet closest to the main water supply pipe, and the position closest to the water distribution member. Includes that the underdrain pipe at is connected to the outlet located farthest from the main water supply pipe.

In still another embodiment, the underground irrigation device according to the present invention is provided so that the center of a plurality of outlets included 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 the water supply for supplying irrigation water provided in the field is supplied, the main water supply pipe connected to the downstream side of the water supply pipe and a plurality of water supply branches branching on the downstream side of the main water supply pipe. A pipe, a plurality of perforated pipes connected to the downstream side of a plurality of water supply branch pipes, a drainage branch pipe connecting a plurality of perforated pipes on the downstream side of the plurality of perforated pipes, and a downstream side of the drainage branch pipe. The main drainage pipe connected to the main drainage pipe, the water level-adjustable water instep pipe connected to the downstream side of the main drainage pipe, and connected between the main water supply pipe and a plurality of water supply branch pipes, and water is supplied from the main water supply pipe. An underground irrigation device is provided that stores irrigation water and includes a water distribution member capable of supplying the stored irrigation water to a plurality of water supply branch pipes at the same head pressure.

In one embodiment, the underground irrigation apparatus according to the present invention has a plurality of outlets in which a water distribution member is connected to a plurality of water supply branch pipes, and a storage unit for storing irrigation water below the plurality of outlets. This includes draining the irrigation water stored in the reservoir from a plurality of outlets to a plurality of water supply branch pipes by overflowing.

In another embodiment of the underground irrigation device 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 closest to the main water supply pipe. This includes connecting the water supply branch pipe connected to the outlet and connected to the upstream side of the perforated pipe closest to the water distribution member to the outlet farthest from the main water supply pipe.

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

In still another 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 have the same dimensions.

In still another embodiment, the underground irrigation apparatus according to the present invention includes a water supply that can switch between supplying water to the rice field surface and supplying water to the underground irrigation.

According to the present invention, it is possible to provide an underground irrigation device capable of uniformly supplying irrigation water to a plurality of culvert pipes buried in a field and suppressing uneven rise in the groundwater level.

It is explanatory drawing which shows an example of the underground irrigation apparatus which concerns on embodiment of this invention, FIG. 1 (a) shows the schematic plan view, and FIG. 1 (b) shows the schematic sectional view. It is a schematic plan view which shows another example of the underground irrigation apparatus 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 which shows the modification of the underground irrigation apparatus which concerns on embodiment of this invention. It is a schematic plan view which shows another modification of the underground irrigation apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the example of switching of the water supply to the rice field surface and the water supply to the underdrain pipe for underground irrigation using the switching means provided in the water supply. It is a schematic diagram which shows the example of the conventional underground irrigation system, FIG. 7A shows a schematic plan view, and FIG. 7B shows a schematic sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify devices 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. It's not something to do.

As shown in FIGS. 1 (a) and 1 (b), the underground irrigation apparatus according to the embodiment of the present invention is branched from the main water supply pipe 2 for supplying irrigation water and buried in the field 11. It is an underground irrigation device capable of supplying irrigation water to a field 11 through a plurality of culvert pipes 10 by supplying irrigation water to a plurality of culvert pipes 10.

A water supply unit 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 material having strong corrosion resistance such as synthetic resin and stainless steel, and has a storage unit 32 at the bottom for storing the irrigation water supplied from the main water supply pipe 2, and the irrigation water stored in the storage unit 32. Can be supplied to a plurality of underdrain pipes 10 with the same head pressure.

Specifically, for example, as shown in FIG. 3, the water distribution member 3 can be provided with a plurality of outlets 31a, 31b, 31c connected to the plurality of underdrain pipes 10, respectively. In the example of FIG. 2, outlets 31a, 31b, 31c, 31d, 31e, and 31f are provided horizontally at six locations on both side surface portions of the water distribution member 3 at substantially the same height. The number of outlets 31a, 31b, 31c, 31d, 31e, 31f is not particularly limited, and for example, 3 to 12, preferably 4 to 8, can be provided.

The height of the centers of the plurality of outlets 31a, 31b, 31c, 31d, 31e, and 31f included in the water distribution member 3 is provided so as to be lower than the height of the center of the inlet 20 of the water distribution member 3, respectively. Is preferable. For example, as shown in FIG. 3, a center line (lines AA in FIG. 3) defined to be a horizontal line passing through the centers of a plurality of outlets 31a, 31b, 31c is a water distribution member from the main water supply pipe 2. It is provided so as to be lower than the center of the inflow port 20 to 3 (line BB in FIG. 3). This makes it easier to supply irrigation water from the main water supply pipe 2 to the outlets 31a, 31b, 31c, 31d, 31e, 31f of the water distribution member 3.

The water distribution member 3 stores the irrigation water stored in the irrigation water temporarily stored in the irrigation water supplied from the main water supply pipe 2 below the plurality of outlets 31a, 31b, 31c, 31d, 31e, 31f. , A plurality of outlets 31a, 31b, 31c, 31d, 31e, 31f are overflowed to flow out to a plurality of culvert pipes 10.

Each flow is supplied by overflowing the irrigation water stored in the storage section 32 from a plurality of outlets 31a, 31b, 31c, 31d, 31e, 31f arranged at substantially the same height (underground depth). The head pressures of the irrigation water flowing out from the outlets 31a, 31b, 31c, 31d, 31e, and 31f are the same. As a result, the supply resistance of the irrigation water can be made uniform between the plurality of underdrain pipes 10 regardless of the distance of the underdrain pipe 10 from the water distribution member 3. That is, according to the present embodiment, it is possible to uniformly supply the irrigation water to the plurality of culvert pipes 10 buried in the field 11, and it is possible to suppress the uneven rise of 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 via the water distribution member 3 on the downstream side of the main water supply pipe 2. Multiple perforated pipes 5a, 5b, 5c, 5d, 5e, 5f and multiple perforated pipes 5a, 5b, 5c, 5d connected to the downstream side of the branch pipes 4a, 4b, 4c, 4d, 4e, 4f. A drainage branch pipe 6 for connecting a plurality of perforated pipes 5a, 5b, 5c, 5d, 5e, and 5f on the downstream side of the pipes 5e and 5f is provided. The underdrain pipe generally means a general term for pipes buried in the ground, but the underdrain pipe 10 according to the present embodiment includes at least water supply branch pipes 4a, 4b, 4c, 4d, 4e, and 4f. , 5a, 5b, 5c, 5d, 5e, 5f and drainage branch pipe 6 are included at least, and if necessary, a known pipe or the like to be buried in the ground is added to these. It may be a concept. A main drainage pipe 7 is connected to the downstream side of the drainage branch pipe 6, and a water level adjusting type water instep pipe 8 is connected to the downstream side of the main drainage pipe 7.

In the example of FIG. 2, the perforated pipes 5a and 5f located farthest from the water distribution member 3 and the water supply branch pipes 4a and 4f connected to the perforated pipes 5a and 5f are located closest to the main water supply pipe 2. The water supply branch pipes 4c and 4d connected to the outlets 31a and 31f and connected to the perforated pipes 5c and 5d and the perforated pipes 5c and 5d located closest to the water distribution member 3 are the most from the main water supply pipe 2. It is connected to the outlets 31c and 31d at a distant position.

As described above, any of the outlets 31a, 31b, 31c, 31d, 31e, and 31f in which 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. Connect the underdrain pipe 10 at a relatively close position to any of the outlets 31a, 31b, 31c, 31d, 31e, 31f at a position relatively far from the main water supply pipe 2 of the water distribution member 3. By doing so, it is possible to uniformly supply the irrigation water to the plurality of underdrain pipes 10 buried in the field 11, and it is possible to suppress the uneven rise of the groundwater level.

In the example of FIG. 2, the water distribution member 3 is placed in the center, and the underdrain pipe 10 is arranged symmetrically with respect to the water distribution member 3. However, as shown in FIG. 4, the water distribution member 3 is arranged. Of course, it can also be placed at the end of the field 11.

Further, in the examples of FIGS. 2 and 3, the underdrain pipe 10 connected to the water distribution member 3 shows an example in which the perforated pipe 5a of 1 is connected to the water supply branch pipe 4a of 1. As shown in the above, 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 water supply branch pipes 4a, 4b, 4c, 4d, 4e, and 4f and the diameters of the perforated pipes 5a, 5b, 5c, 5d, 5e, and 5f are adjusted to have substantially the same dimensions. , It is more preferable that the dimensions are adjusted to be exactly the same. As a result, the head pressure of each of the perforated pipes 5a, 5b, 5c, 5d, 5e, and 5f can be made uniform.

As shown in FIG. 6, the water supply unit 1 is a water supply unit with a water supply switching function capable of supplying the field surface of the field 11 to the surface of the field and the underground irrigation water of the field 11 to the underdrain pipe 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 basin 1 is buried in the ground from the water supply pipe 91 that supplies water to the field surface of the field 11 and the water supply basin 1 in order to fill the paddy field. An underground irrigation pipe 92 connected to the main water supply pipe 2 in the ground of 11 and a switching means 93 for switching water supply to the rice field water supply pipe 91 and the underground irrigation pipe 92 as needed are provided.

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

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

Thus, although the invention has been described by the embodiments described above, the statements and drawings that form part of this disclosure should not be understood to limit the invention. From this disclosure, various alternative embodiments and operational techniques will be clarified to those skilled in the art, and at the implementation stage, they can be deformed and embodied within a range that does not deviate from the gist.

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 instep pipe 10 ... Underdrain pipe 11 ... Field 20 ... Inlet 31a-31f ... Outlet 32 ... Reservoir 91 ... Field water supply pipe 92 ... Underground irrigation pipe 93 ... Switching means 101 ... Water supply pipe 102 ... Elbow 103 ... T-shaped pipe 104 ... Underdrain pipe

Claims (9)

By supplying the irrigation water to a plurality of culvert pipes that are branched from the main water supply pipe that supplies the irrigation water and are buried in the field, the irrigation water can be supplied into the field through the plurality of culvert pipes underground. It ’s a mulvert device,
The irrigation water connected between the main water supply pipe and the plurality of culvert pipes and supplied from the main water supply pipe is stored, and the stored irrigation water is supplied to the plurality of culvert pipes at the same head pressure. Equipped with possible water distribution members ,
The culvert pipe located farthest from the water distribution member is connected to the outlet closest to the main water supply pipe, and the culvert pipe closest to the water distribution member is from the main water supply pipe. An underground irrigation device characterized by being connected to the farthest outlet . The water distribution member
A plurality of outlets connected to the plurality of underdrain pipes, respectively,
A storage unit for storing the irrigation water is provided below the plurality of outlets.
The underground irrigation apparatus according to claim 1, wherein the irrigation water stored in the storage unit is discharged from the plurality of outlets to the plurality of culvert pipes by overflow. The underground irrigation device according to claim 1 or 2 , wherein the center of a plurality of outlets included in the water distribution member is provided so as to be lower than the center of the inlet of the water distribution member. If you supply water to supply the irrigation water provided in the field,
The main water supply pipe connected to the downstream side of the water supply tank,
A plurality of water supply branch pipes branching on the downstream side 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 on the downstream side of the plurality of perforated pipes,
The main drainage pipe connected to the downstream side of the drainage branch pipe and
A water level-adjustable water instep pipe connected to the downstream side of the main drainage pipe,
It is connected between the main water supply pipe and the plurality of water supply branch pipes, stores the irrigation water supplied from the main water supply pipe, and transfers the stored irrigation water to the plurality of water supply branch pipes at the same head pressure. Equipped with water distribution materials that can be supplied ,
The water supply branch pipe connected to the upstream side of the perforated pipe 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 the position closest to the water distribution member. An underground irrigation device in which the water supply branch pipe connected to the upstream side of the perforated pipe is connected to an outlet located at a position farthest from the main water supply pipe . The water distribution member
A plurality of outlets connected to the plurality of water supply branch pipes, respectively,
A storage unit for storing the irrigation water is provided below the plurality of outlets.
The underground irrigation apparatus according to claim 4 , wherein the irrigation water stored in the storage unit is discharged from the plurality of outlets to the plurality of water supply branch pipes by overflowing. The underground irrigation device according to claim 4 or 5 , wherein the center of a plurality of outlets included in the water distribution member is provided so as to be lower than the center of the inlet of the water distribution member. The underground irrigation device according to any one of claims 4 to 6 , wherein one perforated pipe is connected to one water supply branch pipe connected to the water distribution member. The underground irrigation device according to any one of claims 4 to 7 , wherein the diameter of the water supply branch pipe and the diameter of the perforated pipe are adjusted to have the same dimensions. The device for underground irrigation according to any one of claims 4 to 8 , which includes a water supply irrigation device that can switch between supply to the surface of the rice field and supply to the underground irrigation canal.

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