JP6832754B2 - Underground irrigation system - Google Patents

Description

The present invention relates to an underground irrigation system, in particular, to, for example, an underground irrigation system that supplies water from underground to a large plot field.

An example of a conventional underground irrigation system is disclosed in Patent Document 1. In the underground irrigation system of Patent Document 1, a water level setting device (overflow weir for setting the water level) is installed on the downstream side of a perforated pipe (underground buried pipe) buried in the ground of the field, and this water level setting device is used. By adjusting the irrigation water level, the water level of the field (including the groundwater level and the surface water level) is set.

Japanese Unexamined Patent Publication No. 1-95712

In recent years, field maintenance projects such as large-scale field development have been promoted. However, in the technique of Patent Document 1, since the water level is collectively managed for each field (cultural land), there is a risk that the water level of the field cannot be properly managed when the field is divided into large sections. For example, in a large-sized field, there is a high possibility that a difference in the amount of underground infiltration will occur depending on the area of the field, and there is a risk that an unintended water level difference will occur in the field. In addition, the difference in water level between the upstream side and the downstream side during water supply and drainage caused by the hydraulic gradient increases as the pipe distance increases, so in a large compartmentalized field, the upstream side and the downstream side of the pipe The water level difference becomes large.

Therefore, the main object of the present invention is to provide a novel, underground irrigation system.

Another object of the present invention is to provide an underground irrigation system capable of appropriately controlling the water level of a field even in a large-sized field.

The first invention is an underground irrigation system that supplies water from underground to a field partitioned into a rectangular shape, and is provided on one side of the field and the other side facing one side, respectively. A first water supply channel and a second water supply channel extending along the one side direction, a drainage channel extending along the one side direction provided in the central part of the field, and a drainage channel extending along the one side direction are provided on both sides of the drainage channel of the field. It is provided with a first underground irrigation system and a second underground irrigation system, and each of the first underground irrigation system and the second underground irrigation system extends along one side direction and is arranged at predetermined intervals in a direction orthogonal to the one side direction. a plurality of perforated tubes that are set embedded in the field of underground, connecting the upstream ends of the plurality of perforated pipes, the water supplied from the first water supply passage or the second water supply path to each perforated pipe A water supply side connecting pipe to guide, a draining side connecting pipe that connects the downstream ends of a plurality of perforated pipes and guides water discharged from each perforated pipe to a drainage channel, and a downstream end of a plurality of perforated pipes. Each of the downstream ends of the water supply side connecting pipe is an underground irrigation system connected to the drainage channel, provided with a drainage control device provided in each of the sections.

In the first invention, the underground irrigation system is provided with a first water supply channel and a second water supply channel provided on one side of the field and the other side facing the other side, which are partitioned in a rectangular shape, and the field. It is provided in the center and has a drainage channel. In addition, a first underground irrigation system and a second underground irrigation system are provided on both sides of the drainage channel of the field. Each of the first underground irrigation system and the second underground irrigation system is provided with a plurality of perforated pipes buried underground in the field at predetermined intervals, and the water level of the field is supplied and drained by using the perforated pipes. Keep at the desired water level. The first water supply channel, the second water supply channel, the drainage channel, and the plurality of perforated pipes are provided so as to extend in parallel with each other. The upstream end portions of the perforated pipes are connected to each other by a water supply side connecting pipe that guides the water supplied from the water supply channel to each perforated pipe. Further, each of the downstream end portions of the water supply side connecting pipe is connected to the drainage channel. On the other hand, the downstream ends of the perforated pipes are connected to each other by a drainage side connecting pipe that guides the water discharged from each perforated pipe to the drainage channel. A drainage control device for controlling drainage from the perforated pipe is provided at the downstream end of each perforated pipe. By using the drainage control device provided in each perforated pipe, it is possible to control the drainage for each perforated pipe and set the water level.

According to the first invention, since the drainage control device is provided for each perforated pipe, the water level can be set individually for each perforated pipe. Therefore, the water level of the field can be appropriately managed even in a large-sized field.

The second invention is subordinate to the first invention and includes a water supply control device provided at each of the upstream end portions of the plurality of perforated pipes.

In the second invention, a water supply control device for controlling water supply to the perforated pipe is provided at the upstream end of each perforated pipe. Then, by using the water supply control device and the drainage control device provided in each perforated pipe, the water supply and drainage are controlled for each perforated pipe and the water level is set.

According to the second invention, since the water supply control device and the drainage control device are provided for each perforated pipe, the water level can be set more appropriately for each perforated pipe.

The third invention is subordinate to the first or second invention, and includes an electric water supply control device capable of automatic control or remote control provided at each of the upstream end portions of the water supply side connecting pipe.

In the third invention, a water supply control device is provided at the upstream end of the water supply side connecting pipe. This water supply control device is an electric device capable of automatic control or remote control based on a pre-stored program. As a result, the overall water level management of the field can be automated or remotely controlled, so that the work load in the field is reduced.

The fourth invention is an underground irrigation system that supplies water to a field from underground, and a plurality of perforated pipes buried at predetermined intervals in the basement of the field, and upstream end portions of the plurality of perforated pipes. The water supply side connecting pipe that connects the water supplied from the water supply channel to each perforated pipe, and the downstream ends of the plurality of perforated pipes are connected to each other, and the water discharged from each perforated pipe is drained. A drainage control device is provided at each of the drainage side connecting pipes leading to the water supply side and the downstream end portions of the plurality of perforated pipes, and the downstream end portion of the water supply side connecting pipe is a valve capable of opening and closing the water supply side connecting pipe. It is an underground irrigation system that is connected to a drainage channel via a member.

According to the fourth invention, since the downstream end of the water supply side connecting pipe is connected to the drainage channel, mud and the like accumulated in the water supply side connecting pipe can be directly discharged to the drainage channel, and the water supply side connecting can be made. The pipe cleaning work (mud spitting work) becomes easy. Therefore, the life of the underground irrigation system can be extended because the water supply side connecting pipe can be properly maintained and managed. Further, by appropriately maintaining and managing the water supply side connecting pipe, the water supply to each perforated pipe is appropriately maintained, so that the water level setting function for each perforated pipe is also appropriately maintained.

The fifth invention is subordinate to the fourth invention, and each of the upstream end portions of the plurality of perforated pipes is connected to a branch portion formed on the upper portion of the pipe wall of the water supply side connecting pipe.

According to the fifth invention, the inflow of mud or the like from the water supply side connecting pipe to each perforated pipe is reduced, so that the mud pool in each perforated pipe is reduced. Therefore, the frequency of cleaning each perforated pipe can be reduced.

The sixth invention is dependent on any one of the first to fifth inventions, and a washing machine can be inserted into the inside of the perforated pipe at each of the upstream end portions of the plurality of perforated pipes. A tube is provided.

According to the sixth invention, the cleaning work of each perforated pipe can be easily performed, and each perforated pipe can be appropriately maintained and managed, so that the life of the underground irrigation system is extended.

The seventh invention is subordinate to the sixth invention, and the rising pipe for cleaning is a rising pipe constituting the water supply control device.

In the seventh invention, the rising pipe constituting the water supply control device is also used as the rising pipe for cleaning.

The eighth invention is dependent on any one of the first to seventh inventions, and the plurality of perforated pipes extend along the short side direction of the field and are arranged at predetermined intervals in the long side direction of the field. Be placed.

According to the eighth invention, since each perforated pipe is arranged so as to extend in the short side direction of the field, the water level difference caused by the hydraulic gradient can be reduced even when the field is divided into large sections. In addition, mud and the like are less likely to accumulate on the perforated pipe, and the cleaning work of the perforated pipe becomes easy.

The ninth invention is subordinate to any one of the first to eighth inventions, and the drainage control device includes a basin having a water level setting mechanism.

According to the ninth invention, as the drainage control device provided at the downstream end of each perforated pipe, a basin having a water level setting mechanism such as a telescopic type and a shutter type is used, so that the water level is managed in each perforated pipe. Can be easily performed.

A tenth invention is an underground irrigation system that supplies water to a field from underground, and a plurality of perforated pipes buried at predetermined intervals in the basement of the field, and upstream end portions of the plurality of perforated pipes. Connect the water supply side connecting pipe that guides the water supplied from the water supply channel to each perforated pipe, and connect the downstream ends of the plurality of perforated pipes to drain the water discharged from each perforated pipe. The downstream end of the water supply side connecting pipe is an underground irrigation system having a drainage side connecting pipe leading to the road and connecting the water supply side connecting pipe to the drainage channel via a valve member that can be opened and closed.

In the tenth invention, the underground irrigation system includes a plurality of perforated pipes buried underground in the field at predetermined intervals, and the water level of the field is set to a desired water level by supplying and draining the field using the perforated pipes. Keep in. The upstream end portions of the perforated pipes are connected to each other by a water supply side connecting pipe that guides the water supplied from the water supply channel to each perforated pipe. On the other hand, the downstream ends of the perforated pipes are connected to each other by a drainage side connecting pipe that guides the water discharged from each perforated pipe to the drainage channel. Then, the downstream end of the water supply side connecting pipe is connected to the drainage channel via a valve member capable of opening and closing the pipeline of the water supply side connecting pipe.

According to the tenth invention, since the downstream end of the water supply side connecting pipe is connected to the drainage channel, mud and the like accumulated in the water supply side connecting pipe can be directly discharged to the drainage channel, and the water supply side connecting can be made. The pipe cleaning work (mud spitting work) becomes easy. Therefore, since the water supply side connecting pipe can be appropriately maintained and managed, the life of the underground irrigation system can be extended, and the water level can be appropriately managed even in a large-sized field. In addition, since the water supply to each perforated pipe is properly maintained by properly maintaining and managing the water supply side connecting pipe, for example, when setting the water level for each perforated pipe, the water level setting function Is also maintained properly.

According to the present invention, since the drainage control device is provided for each perforated pipe, the water level can be set individually for each perforated pipe. Therefore, the water level of the field can be appropriately managed even in a large-sized field.

The above-mentioned object, other object, feature and advantage of the present invention will become more apparent from the detailed description of the examples described below with reference to the drawings.

It is a schematic diagram which shows schematic the piping structure of the underground irrigation system which is one Example of this invention. It is a top view which shows the underground irrigation system of FIG. It is sectional drawing which shows the cross section in the pipe axis direction of the perforated pipe of the underground irrigation system of FIG. It is sectional drawing which shows the water supply control device provided in the underground irrigation system of FIG. It is sectional drawing which shows the drainage control device provided in the underground irrigation system of FIG. It is a schematic diagram for demonstrating the water level management by the underground irrigation system of FIG. It is a schematic diagram which shows the main part of the modification of the water supply control device or the drainage control device. It is a top view which shows the underground irrigation system which is another Example of this invention. It is a top view which shows the underground irrigation system which is still another Example of this invention. It is a top view which shows the underground irrigation system which is still another Example of this invention. It is sectional drawing which shows the cross section in the pipe axis direction of the perforated pipe of the underground irrigation system of FIG. FIG. 3 is a plan view showing a water supply control device included in the underground irrigation system of FIG. It is sectional drawing which shows the cross section of the water supply control device in line XIII-XIII of FIG. It is sectional drawing which shows the cross section of the water supply control apparatus in line XIV-XIV of FIG. It is a schematic diagram for demonstrating the water level management by the underground irrigation system of FIG. It is a schematic diagram which shows the modification of the drainage control device provided in the underground irrigation system. It is a schematic diagram which shows other modification of the drainage control device provided in the underground irrigation system. It is a schematic diagram which shows the further modification of the drainage control device provided in the underground irrigation system.

With reference to FIG. 1, the underground irrigation system 10 (hereinafter, simply referred to as “system 10”), which is an embodiment of the present invention, is used from underground with respect to a field 100 such as a paddy field, a field, or a field conversion site. It is a water supply / drainage facility for supplying water, and is suitably used for a large-scale field 100. As will be described in detail later, the system 10 supplies water to the field 100 from a plurality of perforated pipes 12 buried underground, or uses the perforated pipes 12 to supply excess water generated in the field 100. By discharging, the water level of the field 100 (including the groundwater level and the surface water level) is kept at a desired water level.

In this embodiment, the field 100 is a large-division field divided into a rectangular shape of, for example, 200 m × 100 m by a farm road and a ridge. Water supply channels (irrigation canals) 102 such as open channels or pipelines are provided on the farm roads or ridges at both ends in the long side direction of the field 100 so as to extend in the short side direction of the field 100. Further, a drainage pipeline extending in the short side direction of the field 100 is buried as a drainage channel 104 in the central portion in the long side direction of the field 100. However, the drainage channel 104 may be an open channel. Then, the system 10 is arranged on each of the side portions of the field 100 across the drainage channel 104.

However, the arrangement of the water supply channel 102 and the drainage channel 104 can be appropriately changed according to the situation of the field 100. For example, a water supply channel 102 may be arranged at the center of the field 100 and drainage channels 104 may be arranged at both ends of the field 100, or a water supply channel 102 may be arranged at one end of the field 100, and the other of the field 100. A drainage channel 104 may be arranged at the end. Further, the arrangement of each component of the system 10 described later may be appropriately changed depending on the arrangement of the water supply channel 102 and the drainage channel 104 and the like.

As shown in FIGS. 2 and 3, the system 10 includes a plurality of perforated pipes 12, a water supply side connecting pipe 14, a drainage side connecting pipe 16, and the like. These pipes 12, 14, 16 are formed of a synthetic resin such as polyethylene or hard vinyl chloride, and are buried underground so as to extend horizontally or with a gentle slope capable of draining water in the pipe. To.

The perforated pipe 12 is a pipe having a plurality of holes (not shown) in the pipe wall thereof, and in this embodiment, the pipe is piped using a corrugated pipe or the like. The perforated pipes 12 extend in the same direction as the water supply channel 102 and the drainage channel 104, that is, along the short side direction of the field 100, and are arranged so as to be arranged at predetermined intervals in the long side direction of the field 100.

The inner diameter of the perforated pipe 12 is, for example, 50 to 100 mm, and the length of the perforated pipe 12 is a length extending over substantially the entire length in the short side direction of the field 100. The burial depth of the perforated pipe 12 is, for example, 40 to 70 cm, and the distance between adjacent perforated pipes 12 is, for example, 5 to 15 m. However, the shape, size, arrangement mode, etc. of the perforated pipe 12 can be changed as appropriate. In addition, in FIG. 1 and FIG. 2, for simplification of the drawing, four perforated pipes 12 are shown, and the size of the perforated pipe 12 with respect to the size of the field 100 (the same applies to other constituent parts). Is not accurate either. Further, no holes are formed at both ends of the perforated pipe 12 piped outside the field 100.

The water supply side connecting pipe 14 and the draining side connecting pipe 16 are buried in the farm road or the ridge portion at both ends in the short side direction of the field 100. The inner diameters of the water supply side connecting pipe 14 and the draining side connecting pipe 16 are set slightly larger than the inner diameter of the perforated pipe 12, and are set to, for example, 100 mm.

The water supply side connecting pipe 14 is a pipe that connects the upstream end portions of the perforated pipe 12 to each other, and guides the water supplied from the water supply channel 102 to each perforated pipe 12. In this embodiment, the upstream end of each perforated pipe 12 is connected to a branch (lower end of the rising pipe 44) that rises from the upper part of the pipe wall of the water supply side connecting pipe 14. That is, the connecting portion between each perforated pipe 12 and the water supply side connecting pipe 14 is provided above the lower half portion of the water supply side connecting pipe 14. As a result, the inflow of mud or earth and sand from the water supply side connecting pipe 14 to each perforated pipe 12 is reduced, and the mud or the like contained in the irrigation water is mainly deposited on the water supply side connecting pipe 14.

Further, the downstream end of the water supply side connecting pipe 14 is connected to the drainage channel 104 via a valve member 20 capable of opening and closing the pipeline of the water supply side connecting pipe 14. As the valve member 20, the same one as the water supply control device 40 and the drainage control device 42, which will be described later, or a general-purpose gate valve or the like may be used. By connecting the downstream end of the water supply side connecting pipe 14 to the drainage channel 104 in this way, the mud and the like accumulated in the water supply side connecting pipe 14 can be directly discharged to the drainage channel 104, and the water supply side can be discharged. The cleaning work (mud spitting work) of the connecting pipe 14 becomes easy. Further, an inspection rising pipe 22 is provided at the confluence of the water supply side connecting pipe 14 and the drainage channel 104.

On the other hand, the drainage side connecting pipe 16 is a pipe that connects the downstream end portions of the perforated pipes 12 to each other, and guides the water discharged from each perforated pipe 12 to the drainage channel 104. An inspection rising pipe is provided at the upstream end of the drainage side connecting pipe 16, the confluence of each perforated pipe 12 and the drainage side connecting pipe 16, and the confluence of the drainage side connecting pipe 16 and the drainage channel 104. 22 is provided.

Each of the inspection rising pipes 22 is used for checking whether the inside of the pipe is clogged with dust, removing the dust, and the like. Further, the inspection rising pipe 22 can also be used as an insertion port for inserting the high pressure washer into the pipe.

Further, a water supply control device 24 for controlling water supply to the entire system 10 is provided at the upstream end of the water supply side connecting pipe 14. The water supply control device 24 includes a water supply basin 26, a water supply valve 28, and the like. An intake pipe 30 branched from the water supply channel 102 is connected to the bottom of the water supply basin 26, and a water supply valve 28 connected to the downstream end of the water intake pipe 30 is housed in the water supply basin 26.

As the water supply valve 28, a general-purpose water supply valve can be appropriately used. Briefly, the water supply valve 28 is provided with a valve body that can be moved up and down, and when a handle provided at the upper end of the valve shaft is operated to apply a rotational force to the valve shaft, a feed screw mechanism is provided. The valve body moves up and down. The vertical movement of the valve body opens and closes the opening at the downstream end of the water intake pipe 30, and the amount of water taken from the water supply channel 102 is adjusted by adjusting the opening degree (opening).

Further, an underground water supply port 32 is provided at the bottom of the water supply basin 26, and an upstream end portion of the water supply side connecting pipe 14 is connected to the underground water supply port 32. The water flowing into the water supply basin 26 from the water supply channel 102 by opening the water supply valve 28 is supplied to the water supply side connecting pipe 14 from the underground water supply port 32. Further, on the side wall of the water supply basin 26, a ground water supply port 34 for supplying water from the ground is provided. A weir plate is attached to the above-ground water supply port 34 so as to be vertically movable and detachable.

Then, at both ends of each perforated pipe 12, a water supply control device 40 and a drainage control device 42 for enabling the water level setting for each perforated pipe 12 are provided. That is, at the upstream end (water supply side) of each perforated pipe 12, a water supply control device 40 for individually controlling the water supply to the perforated pipe 12 is provided, and the downstream end of each perforated pipe 12 (water supply side). On the drainage side), a drainage control device 42 for individually controlling drainage from the perforated pipe 12 is provided. In this embodiment, a control device including a plug member 46 is used as both the water supply control device 40 and the drainage control device 42.

Specifically, as shown in FIG. 4, the water supply control device 40 is slidably provided on the rising pipe 44 provided at the diversion portion from the water supply side connecting pipe 14 to the perforated pipe 12 and the rising pipe 44. Includes plug member 46. The plug member 46 includes a rod-shaped handle 48. At the lower end of the handle 48, a substantially columnar water blocking portion 50 formed of an elastic member such as rubber is provided. On the other hand, a grip portion 52 and a stopper 54 arranged below the grip portion 52 are provided at the upper end portion of the handle portion 48. Further, a cap 56 having a short cylindrical guide portion 58 through which the handle portion 48 of the plug member 46 is inserted is attached to the upper end portion of the rising pipe 44. The position where the upper end surface of the guide portion 58 and the lower end surface of the stopper 54 come into contact with each other is associated with the lowermost position of the plug member 46. That is, by pushing down the plug member 46 until the guide portion 58 and the stopper 54 come into contact with each other (that is, the plug member 46 is in the lowest position), the water supply side connection is maintained while maintaining the water flow in the water supply side connection pipe 14. The water supply from the pipe 14 to the perforated pipe 12 is blocked by the water stop portion 50. On the other hand, when the plug member 46 is pulled up from the lowest position, water can be supplied from the water supply side connecting pipe 14 to the perforated pipe 12. The plug member 46 can be fixed at an arbitrary height position by the frictional force between the inner surface of the rising pipe 44 and the water stop portion 50. Although not shown, it is preferable that a scale portion for displaying the opening degree of the water passage in the water supply control device 40 is provided under the stopper 54 on the outer peripheral surface of the handle portion 48. By using this scale portion as a guide, the operator can easily adjust the opening degree of the water passage, that is, the amount of water supplied to the perforated pipe 12.

On the other hand, as shown in FIG. 5, the drainage control device 42 has the same configuration as the water supply control device 40 described above, and has a rising pipe 44 and a rising pipe provided at the downstream end of the perforated pipe 12. A plug member 46 slidably provided on the 44 is included. The same reference numbers as those of the water supply control device 40 will be assigned, and duplicate description will be omitted. In the drainage control device 42, by setting the plug member 46 at the lowest position, drainage from the perforated pipe 12 to the drain side connecting pipe 16 is stopped, and when the plug member 46 is pulled up from the lowest position, the perforated pipe The water in 12 is discharged to the drain side connecting pipe 16.

Returning to FIGS. 2 and 3, water level confirmation rising pipes 60 are provided at both ends of each perforated pipe 12 at a position near the downstream side of the water supply control device 40 and a position near the upstream side of the drainage control device 42. .. Since the internal space of the rising pipe 60 for confirming the water level is in a state of communicating with the void in the field 100 via the perforated pipe 12, the water level in the rising pipe 60 for confirming the water level is determined by the perforated pipe 12. It is substantially the same as the water level of the field 100 in each of the arranged areas. Therefore, the operator can confirm the water level of the field 100 in each region by visually observing the water level in the water level confirmation rising pipe 60. Although not shown, it is preferable to provide a scale portion on the inner peripheral surface of the water level confirmation rising pipe 60 to indicate the height position of the field 100 with respect to the ground surface. As a result, the operator can more accurately confirm the water level of the field 100.

Subsequently, a method of keeping the water level of the field 100 at a desired water level by using the system 10 as described above will be described with reference to FIGS. 3 and 6.

When irrigation is performed using the system 10, as shown in FIG. 3, the plug member 46 of each drainage control device 42 is pushed down to the lowest position to be in a fully closed state. On the other hand, the plug member 46 of each water supply control device 40 is pulled up from the lowest position to open the plug member 46 so that water can be supplied from the water supply side connecting pipe 14 to the perforated pipe 12. Then, in this state, the water supply valve 28 of the water supply control device 24 is opened. Then, the water flowing through the water supply channel 102 flows into each perforated pipe 12 through the intake pipe 30, the water supply basin 26, and the water supply side connecting pipe 14, and enters the ground of the field 100 from the hole of each perforated pipe 12. Will be supplied. As a result, the water level of the field 100 rises. Therefore, as shown in FIG. 6, the plug member 46 of the water supply control device 40 and the drainage control device 42 is checked while checking the water level rise from the water level confirmation rising pipe 60. It is manually raised and lowered (that is, the water supply and drainage to the perforated pipe 12 is manually adjusted) so that the water level of the field 100 becomes the target water level. After the water level of the field 100 is adjusted to a desired water level, it is preferable that each drainage control device 42 is fully closed and the water supply valve 28 is closed.

By adjusting the positions of the plug member 46 of the water supply control device 40 and the drainage control device 42 in this way, the water level of the field 100 can be set arbitrarily (for example, from -50 cm to +20 cm with respect to the ground surface of the field 100). it can. Then, in this embodiment, since the water supply and drainage can be controlled and the water level can be set for each of the perforated pipes 12, the water level of the field 100 can be finely controlled.

For example, when the water level in the field 100 area on the upstream side of the water supply side connecting pipe 14 becomes high due to the influence of the hydraulic gradient or the difference in the underground infiltration amount, the water level is connected to the upstream side of the water supply side connecting pipe 14. It is preferable to open the drainage control device 42 of the hole pipe 12 to lower the water level of the field 100 in the surrounding area. As a result, the water level of the entire field 100 can be made substantially uniform. In addition, by changing the set water level for each perforated pipe 12, it is possible to cultivate a wide variety of vegetables with different optimum groundwater levels even within the same field 100, and for each area considering the difference in crop growth conditions, etc. It is also possible to adjust the water level. Further, by blocking the water supply to the perforated pipe 12 by the plug member 46 of the water supply control device 40, it is possible to stop the water supply to the field 100 only by the arbitrary perforated pipe 12.

Subsequently, the maintenance method of the system 10 will be described. Although not shown, when performing maintenance (mud discharge) of the water supply side connecting pipe 14, the valve member 20 provided at the downstream end of the water supply side connecting pipe 14 is opened, and the water supply side is connected to the underground water supply port 32. A high-pressure washer is inserted into the connecting pipe 14, and mud and the like accumulated in the water supply side connecting pipe 14 are directly discharged to the drainage channel 104. As a result, the water supply side connecting pipe 14 can be appropriately maintained and managed, so that the life of the system 10 is extended. Further, by appropriately maintaining and managing the water supply side connecting pipe 14, the water supply to each of the perforated pipes 12 is appropriately maintained, so that the water level setting function for each of the perforated pipes 12 is also appropriately maintained.

Further, when performing maintenance of each perforated pipe 12, the plug member 46 and the cap 56 are removed from the water supply control device 40, and the plug member 46 of the drainage control device 42 is opened. Then, a high pressure washer is inserted into the perforated pipe 12 from the upper opening of the rising pipe 44, and the mud and the like accumulated in the perforated pipe 12 are discharged to the drain side connecting pipe 16. That is, the rising pipe 44 constituting the water supply control device 40 is used as a washing rising pipe into which the washing machine can be inserted into the perforated pipe 12. As a result, each perforated pipe 12 can be appropriately maintained and managed, so that the life of the system 10 is extended and the water level setting function for each perforated pipe 12 is also appropriately maintained. However, instead of the rising pipe 44 of the water supply control device 40, the rising pipe 60 for checking the water level provided at the upstream end of the perforated pipe 12 can be used as the rising pipe for cleaning.

Further, when performing maintenance of the drainage side connecting pipe 16, a high-pressure washing machine is inserted into the drainage side connecting pipe 16 from the inspection rising pipe 22 provided at the upstream end of the draining side connecting pipe 16 to connect the drainage side. The mud and the like accumulated in the pipe 16 are discharged to the drainage channel 104. As a result, the drainage side connecting pipe 16 can be appropriately maintained and managed, so that the life of the system 10 is extended. Further, since the drainage side connecting pipe 16 is appropriately maintained and managed, the drainage from each perforated pipe 12 is appropriately maintained, so that the water level setting function for each perforated pipe 12 is also appropriately maintained.

As described above, according to this embodiment, since the water level can be set individually for each of the perforated pipes 12, it is possible to finely manage the water level of the field 100. Therefore, the water level of the field 100 can be appropriately managed even in the field 100 which is divided into large sections.

Further, according to this embodiment, since the perforated pipe 12 is arranged so as to extend in the short side direction of the field 100, the water level difference caused by the hydrodynamic gradient can be reduced even when the field 100 is divided into large sections. Further, the longer the length of the perforated pipe 12, the higher the possibility that the perforated pipe 12 is blocked by mud or the like. However, as in this embodiment, the perforated pipe 12 is placed on the short side of the field 100. By arranging the pipes so as to extend in the direction, mud and the like are less likely to accumulate on the perforated pipe 12, and the cleaning work of the perforated pipe 12 becomes easy.

Further, according to this embodiment, since the downstream end of the water supply side connecting pipe 14 is connected to the drainage channel 104, it is possible to directly discharge the mud and the like accumulated in the water supply side connecting pipe 14 to the drainage channel 104. Therefore, the mud discharge work of the water supply side connecting pipe 14 becomes easy. Therefore, since the water supply side connecting pipe 14 can be appropriately maintained and managed, the life of the system 10 can be extended, and the water level can be appropriately managed even in the field 100 which is divided into large sections. Further, since each of the upstream end portions of the plurality of perforated pipes 12 is connected to the branch portion formed on the upper portion of the pipe wall of the water supply side connecting pipe 14, the water supply side connecting pipe 14 is connected to each perforated pipe 12. The inflow of mud and the like is reduced, and the mud pool in each perforated pipe 12 is reduced. Therefore, the frequency of cleaning each perforated pipe 12 can be reduced.

In the above embodiment, the inner diameters of the water supply side connecting pipe 14 and the drainage side connecting pipe 16 are set to be slightly larger than the inner diameter of the perforated pipe 12, but the inner diameter of the water supply side connecting pipe 14 is perforated. It can also be set to be significantly larger (for example, 2-5 times) than the inner diameter of the pipe 12. As a result, the flow velocity of the irrigation water in the water supply side connecting pipe 14 becomes small, so that mud and the like contained in the irrigation water tend to settle in the water supply side connecting pipe 14, and the water supply side connecting pipe 14 to each perforated pipe 12 The inflow of mud etc. is reduced. On the other hand, the inner diameter of the drainage side connecting pipe 16 may be set to substantially the same size as the inner diameter of the perforated pipe 12. As a result, the flow velocity of the drainage in the drainage side connecting pipe 16 becomes large, so that the mud or the like is less likely to settle in the drainage side connecting pipe 16 and the mud or the like is easily discharged to the drainage channel 104.

Further, in the above-described embodiment, the plug member 46 of each of the control devices 40 and 42 can be fixed at an arbitrary height position by the frictional force between the inner surface of the rising pipe 44 and the water stop portion 50. However, in order to more reliably fix the plug member 46 at an arbitrary height position, a sliding stopper may be separately provided for each of the control devices 40 and 42. The specific structure of the non-slip portion can be changed as appropriate, but as an example, a non-slip portion composed of a bag nut 70, a rubber ring 72, or the like as shown in FIG. 7 can be used. .. In this case, a male screw portion screwed with the bag nut 70 is formed on the outer surface of the guide portion 58, and a rubber ring 72 is provided between the end surface of the guide portion 58 and the bag nut 70. Then, by tightening the bag nut 70 with the plug member 46 at an arbitrary height position, the rubber ring 72 is elastically deformed and pressed against the handle 48, and the plug member 46 is fixed at that height position. Ru.

Further, in the above-described embodiment, the water level confirmation rising pipe 60 for visually confirming the water level is provided in each perforated pipe 12, but a water level sensor is provided instead of the water level confirmation rising pipe 60. You may. In this case, the operator can confirm the water level of the field 100 in each region by confirming the detection result of the water level sensor.

Furthermore, in the above-described embodiment, the water supply control device 40 is provided in each perforated pipe 12, but the water supply control device 40 does not necessarily have to be provided. When the water supply control device 40 is not provided, the water level may be set for each of the perforated pipes 12 by controlling the drainage from the perforated pipe 12 by using the drainage control device 42.

Next, the system 10 which is another embodiment of the present invention will be described with reference to FIG. In this embodiment, as the water supply control device 24 provided at the upstream end of the water supply side connecting pipe 14, an electric water supply control device capable of automatic control or remote control is used, and water management for the entire field 100 is automated. The point is different from the above-described embodiment. Since the other parts are the same, the same reference numbers are given to the parts common to the above-described embodiment, and duplicate explanations are omitted or simplified. Omitting duplicate explanations is the same in other examples described later. In addition, the above-mentioned modification can be appropriately adopted in each of the following examples.

In the embodiment shown in FIG. 8, the electric actuator 64 is attached to the water supply valve 28 included in the water supply control device 24. Further, the rising pipe at the upstream end of the water supply side connecting pipe 14 is provided with a water level sensor 66 such as an ultrasonic sensor that detects the water level inside the pipe, that is, the water level of the field 100.

The electric actuator 64 automatically opens and closes the water supply valve 28 by operating by automatic control or remote control based on a program stored in advance. As the electric actuator 64, a known electric actuator can be appropriately used. Briefly explaining an example of the electric actuator 64, the electric actuator 64 includes a main body case, and a solar cell panel is attached to the upper surface of the top wall of the main body case. In addition, a control panel, an antenna, a storage battery, a motor, a main gear, and the like are housed inside the main body case. A substantially cylindrical rotating shaft is inserted through the shaft portion of the main gear. A key groove extending along the axial direction is formed on the inner peripheral surface of the shaft portion of the main gear, and a sliding key fitted with the key groove extends along the axial direction on the outer peripheral surface of the rotating shaft. It is formed. As a result, the rotating shaft rotates as the main gear rotates, and can slide in the axial direction with respect to the shaft portion of the main gear. Then, the upper end of the valve shaft of the water supply valve 28 is fixedly connected to the lower end of the rotating shaft. Therefore, when the rotation shaft of the electric actuator 64 rotates, the rotational force is transmitted to the valve shaft of the water supply valve 28. The valve shaft and valve body of the water supply valve 28 to which the rotational force is applied move up and down by the feed screw mechanism.

In such a system 10, for example, when the water level detected by the water level sensor 66 becomes lower than a predetermined lower limit water level set in advance, the electric actuator 64 automatically opens the water supply valve 28. And supply water. On the other hand, when the water level detected by the water level sensor 66 becomes higher than a predetermined upper limit water level set in advance, the electric actuator 64 automatically closes the water supply valve 28 to stop the supply of water. To do. As a result, the overall water level of the field 100 is kept within a predetermined range. However, the control of the electric actuator 64 can also be executed by the user performing remote control using a remote control terminal such as a smartphone, a tablet terminal, or a PC owned by the user. In this case, the water level information detected by the water level sensor 66 is transmitted to the remote control terminal owned by the user via a network such as a wireless LAN (for example, Wi-Fi) and the Internet.

Regarding the individual water level setting for each perforated pipe 12, also in the embodiment shown in FIG. 8, the plug member 46 of the water supply control device 40 and the drainage control device 42 is similar to the embodiment shown in FIG. Is done by manually raising and lowering.

As described above, according to the embodiment shown in FIG. 8, since the electric water supply control device 24 capable of automatic control or remote control is provided, the overall water level management of the field 100 can be automated or remotely controlled. Therefore, the work load in the field 100 is reduced.

Subsequently, a system 10 which is still another embodiment of the present invention will be described with reference to FIG. This embodiment differs from the above-described embodiment in that the entire system 10 is automated by using ICT (Information and Communication Technology).

In the embodiment shown in FIG. 9, the electric actuator 64 is attached to the water supply valve 28, and the electric actuator 64 is also attached to each of the water supply control device 40 and the drainage control device 42. Although not shown, when the electric actuator 64 is attached to each of the control devices 40 and 42, a feed screw for moving the plug member 46 of each of the control devices 40 and 42 up and down by the rotational force from the electric actuator 64. A mechanism is provided. For example, a full screw bolt is connected to the lower end of the rotating shaft of the electric actuator 64, and the handle 48 of the plug member 46 of each of the control devices 40 and 42 is provided with a nut structure screwed to the handle 48.

Further, a water level sensor 66 is provided in the rising pipe at the upstream end of the water supply side connecting pipe 14, and an ultrasonic sensor or the like is also provided in the water level checking rising pipe 60 provided at the downstream end of each perforated pipe 12. Water level sensor 76 is provided. The water level sensor 76 detects the water level inside the rising pipe 60 for confirming the water level, that is, the water level of the field 100 in the peripheral region of each perforated pipe 12.

In such a system 10, the water supply and drainage to each of the perforated pipes 12 is automatically controlled individually based on the water level detected by the water level sensor 76 provided for each of the perforated pipes 12. For example, in a certain perforated pipe 12, when the water level detected by the water level sensor 76 is lower than the preset water level, the water supply control device 40 provided in the perforated pipe 12 is opened. At the same time, the drainage control device 42 is closed. On the other hand, when the water level detected by the water level sensor 76 is higher than the preset water level, the water supply control device 40 provided in the perforated pipe 12 is closed and the drainage control device 42 is opened. Be in a state.

Regarding the overall water level management of the field 100, the water supply valve 28 (water supply control device 24) is based on the detected water level of the water level sensor 66 provided in the water supply side connecting pipe 14 as in the embodiment shown in FIG. It is done by the automatic control of. However, the control of the electric actuator provided in each of the control devices 24, 40, 42 may be executed by the user performing remote control.

According to the embodiment shown in FIG. 9, the entire system 10 is automated, that is, all the water management for the field 100 is automated, so that the work load is greatly reduced and the water management without waste becomes possible.

Subsequently, a system 10 which is still another embodiment of the present invention will be described with reference to FIGS. 10-14. In this embodiment, the configurations of the water supply control device 40 and the drainage control device 42 are different from those in the above-described embodiment, and both the water supply control device 40 and the drainage control device 42 use a basin having a water level setting mechanism.

As shown in FIGS. 10-14, in this embodiment, the water supply control device 40 is a sluice basin having a water level setting mechanism, and has a basin body (rising pipe) 80 formed in a bottomed cylindrical shape with an open upper end. Including. At the lower end of the box body 80, a main pipe portion 82 and a branch pipe portion 84 extending in a substantially horizontal direction are formed. The main pipe portion 82 is formed in a straight tubular shape that penetrates the lower end portion of the box body 80 in a straight line. Receiving ports 82a are formed at both ends of the main pipe portion 82, and water supply side connecting pipes 14 are connected to each receiving port 82a. As a result, the main pipe portion 82 forms a part of the water supply side connecting pipe 14. Further, the branch pipe portion 84 is formed in a curved tubular shape, and branches from the substantially central portion of the main pipe portion 82 so that the receiving port 84a formed at the end portion has an angle of 90 degrees with respect to the main pipe portion 82. The upstream end of the perforated pipe 12 is connected to the receiving port 84a of the branch pipe portion 84.

Further, a guide groove (not shown) extending in the vertical direction is formed in the box body 80. A flat plate-shaped partition plate 86 is detachably and vertically movablely attached to the guide groove so as to face the opening on the base end side of the branch pipe portion 84 at a predetermined interval. The partition plate 86 is attached to the box main body 80 in a state where it can be fixed at an arbitrary height position, and also comes into contact with or slides on the inner surface of the box main body 80 in a watertight state via a rubber packing or the like. When the partition plate 86 is in the lowest position, the water supply from the water supply side connecting pipe 14 to the perforated pipe 12 is blocked, and when the partition plate 86 is pulled up from the lowest position, water supply becomes possible. That is, by moving the partition plate 86 up and down, water supply and stop from the water supply side connecting pipe 14 to the perforated pipe 12 are switched, and the amount of water supply is adjusted by adjusting the opening degree thereof.

Further, a plurality of types of partition plates 86 having different lengths in the vertical direction are prepared in advance, and by replacing the partition plate 86, the upper end position of the partition plate 86 when the partition plate 86 is in the lowest position. Can be changed. Even when the partition plate 86 is in the lowest position, water overflows when the water level in the box body 80 exceeds the upper end position of the partition plate 86. Therefore, as will be described later, by replacing the partition plate 86 and changing the upper end position thereof, it is possible to arbitrarily set the water level in the basin body 80 and, by extension, the water level in the field 100 in the peripheral region.

On the other hand, the drainage control device 42 is a merging basin having a water level setting mechanism, and has the same structure as the water supply control device 40. However, in the drainage control device 42, the branch pipe portion 84 is used as a merging portion connected to the downstream end portion of the perforated pipe 12. Further, a drainage side connecting pipe 16 is connected to each receiving port 82a of the main pipe portion 82, and the main pipe portion 82 constitutes a part of the drainage side connecting pipe 16.

When water is supplied to the field 100 by using such a system 10, as shown in FIG. 15, the partition plate 86 of each water supply control device 40 is brought up. Further, the partition plate 86 of each drainage control device 42 is set to a state in which it is in the lowest position and the upper end is in a desired set water level (desired water level). Then, in this state, the water supply valve 28 of the water supply control device 24 is opened. Then, the water flowing through the water supply channel 102 flows into each perforated pipe 12 through the intake pipe 30, the water supply basin 26, and the water supply side connecting pipe 14, and enters the ground of the field 100 from the hole of each perforated pipe 12. Will be supplied. When the water level of the field 100 rises due to the water supply from the perforated pipe 12, the water level of the internal space on the branch pipe portion 84 side of the basin main body 80 of the drainage control device 42 also rises accordingly. Then, when the water level reaches the upper end position of the partition plate 86 of the drainage control device 42, the excess water overflows the partition plate 86 and is connected to the drainage side from the internal space on the opposite side of the branch pipe portion 84 of the box main body 80. It is discharged to the pipe 16 and is discharged to the drainage channel 104 through the drainage side connecting pipe 16. As a result, the water level of the field 100 is maintained at a desired set water level. When the water level of the field 100 rises due to rainfall or the like, excess water exceeding the set water level flows into the perforated pipe 12 and is discharged to the drainage channel 104 beyond the partition plate 86 of the drainage control device 42. .. As described above, in the embodiment shown in FIG. 10, the water level can be easily set for each perforated pipe 12 by adjusting the upper end position of the partition plate 86 of the drainage control device 42.

Further, in the embodiment shown in FIG. 10, the water level can be confirmed from the upper end opening of the box main body 80 of the water supply control device 40 and the drainage control device 42, and the inside of the pipe can be inspected and cleaned. Therefore, the rising pipe 60 for checking the water level at both ends of each perforated pipe 12 and the rising for inspection of the confluence of each perforated pipe 12 and the drainage side connecting pipe 16 provided in the above-described embodiment such as FIG. The pipe 22 is omitted. That is, the basin body (rising pipe) 80 constituting the water supply control device 40 can also be used as a rising pipe for cleaning and a rising pipe for checking the water level, and the basin main body 80 constituting the drainage control device 42 is for checking the water level. It can also be used as a rising pipe and a rising pipe for inspection.

As described above, according to the embodiment shown in FIG. 10, since the water level can be set individually for each perforated pipe 12 as in each of the above-described embodiments, even in the field 100 which is divided into large sections, the field The water level of 100 can be managed appropriately. In particular, according to the embodiment shown in FIG. 10, since each drainage control device 42 has a water level setting mechanism, water level management in each perforated pipe 12 can be easily performed.

In the embodiment shown in FIG. 10, a basin having a water level setting mechanism was also used for the water supply control device 40. However, the water supply control device 40 does not necessarily have to have a water level setting mechanism because it only needs to have a function of switching between water supply from the water supply side connecting pipe 14 to the perforated pipe 12 and its stop.

Further, in the embodiment shown in FIG. 10, as the water level setting mechanism of the drainage control device 42, a mechanism for changing the upper end position of the partition plate 86 by replacing the partition plate 86 was used. The configuration can be changed as appropriate.

For example, as shown in FIG. 16, as the water level setting mechanism included in the drainage control device 42, a slide telescopic type can be adopted. In the embodiment shown in FIG. 16, the drainage control device 42 includes a drainage basin 90 made of concrete. The drainage basin 90 has a curved tubular fixed pipe 92a connected to the drainage side connecting pipe 16 and a straight tubular slide pipe 92b slidably inserted into the vertical pipe portion of the fixed pipe 92a. A formula stand tube 92 is provided. Then, by sliding the slide pipe 92b and adjusting the height position of the upper end opening of the slide pipe 92b, the drainage height is set and the water level is set for each perforated pipe 12. However, as the slide telescopic water level setting mechanism, a partition plate can be used instead of the pipe.

Further, for example, as shown in FIG. 17, a rotary type can be adopted as the water level setting mechanism included in the drainage control device 42. In the embodiment shown in FIG. 17, the drainage control device 42 includes a drainage basin 90 made of concrete, and the drainage basin 90 has a curved tubular rotary vertical pipe 94 that can rotate around the pipe axis with the connecting portion 94a as a fulcrum. Is provided. Then, by rotating the rotary stand pipe 94 and adjusting the height position of the upper end opening of the rotary stand pipe 94, the drainage height is set and the water level is set for each perforated pipe 12.

Further, for example, as shown in FIG. 18, a shutter type can be adopted as the water level setting mechanism included in the drainage control device 42. In the embodiment shown in FIG. 18, the drainage control device 42 includes a drainage basin 90 made of concrete, and the drainage basin 90 is provided with a partition plate 96 so as to be vertically movable. The partition plate 96 can be bent, for example, by connecting rectangular plate members to each other by a soft connecting portion. Further, a pair of substantially arcuate guide grooves 90a are formed on the side wall of the drainage basin 90, and both end portions of the partition plate 96 are slidably fitted into the guide grooves 90a. Then, the partition plate 96 is moved up and down along the guide groove 90a to adjust the height position of the upper end of the partition plate 96, thereby setting the drainage height and setting the water level for each perforated pipe 12. Be told.

Further, although not shown, each perforated pipe 12 may be provided with a water supply / drainage section for water supply / drainage of rice field water. For example, the rising pipe 60 for checking the water level provided at the upstream end of the perforated pipe 12 has a double pipe structure so that the height can be adjusted, and the pipe is installed near the rice field surface. As a result, water can be supplied or drained from the rising pipe 60 for checking the water level. When water supply is required, water is also supplied to the rice field from the ground water supply port 34 of the water supply basin 26. Further, if the drainage control device 42 is fully closed and the upper end opening position of the water level confirmation rising pipe 60 is set to the same height as the rice field surface to supply the irrigation water, the irrigation water will not permeate into the soil. It overflows from the rising pipe 60 for checking the water level and is supplied to the rice field. On the other hand, when drainage is required, especially in heavy rain, the ability to drain water by underground infiltration may not be sufficient, but the water that has stagnated on the surface of the field is guided from the rising pipe 60 for checking the water level to the perforated pipe 12. By discharging the water, it is possible to quickly drain the water.

The specific numerical values such as the dimensions mentioned above are merely examples, and can be appropriately changed as necessary such as product specifications.

10 ... Underground irrigation system 12 ... Perforated pipe 14 ... Water supply side connecting pipe 16 ... Drainage side connecting pipe 20 ... Valve member 22 ... Rise pipe for inspection 24 ... Water supply control device 40 ... Water supply control device 42 ... Drainage control device 60 ... Water level Rise pipe for confirmation 100… Field 102… Water supply channel 104… Drainage channel

Claims (10)

An underground irrigation system that supplies water from underground to a rectangularly divided field.
A first water supply channel and a second water supply channel that are provided on one side of the field and the other side that faces the one side and extend along the one side direction.
A drainage channel provided in the center of the field and extending along the one side direction,
It is provided with a first underground irrigation system and a second underground irrigation system provided on both sides of the drainage channel of the field.
Each of the first underground irrigation system and the second underground irrigation system
The extending along one side direction, a plurality of perforated tubes that are set embedded in the field of underground so as to be arranged at predetermined intervals in a direction orthogonal to the one side direction,
A water supply side connecting pipe that connects the upstream end portions of the plurality of perforated pipes and guides water supplied from the first water supply channel or the second water supply channel to each perforated pipe.
To each of the drainage side connecting pipe that connects the downstream ends of the plurality of perforated pipes and guides the water discharged from each perforated pipe to the drainage channel, and the downstream ends of the plurality of perforated pipes. Equipped with a drainage control device
An underground irrigation system in which each of the downstream ends of the water supply side connecting pipe is connected to the drainage channel. The underground irrigation system according to claim 1, further comprising a water supply control device provided at each of the upstream end portions of the plurality of perforated pipes. The underground irrigation system according to claim 1 or 2, further comprising an electric water supply control device capable of automatic control or remote control provided at each of the upstream end portions of the water supply side connecting pipe. An underground irrigation system that supplies water to the field from underground.
A plurality of perforated pipes buried in the basement of the field at predetermined intervals,
A water supply side connecting pipe that connects the upstream ends of the plurality of perforated pipes and guides the water supplied from the water supply channel to each perforated pipe.
A drainage side connecting pipe that connects the downstream ends of the plurality of perforated pipes and guides the water discharged from each perforated pipe to the drainage channel, and
A drainage control device provided at each of the downstream ends of the plurality of perforated pipes is provided.
The downstream end of the water supply connection pipe is connected to the water supply connection pipe to the drainage channel via an openable valve member, underground irrigation systems. The underground irrigation system according to claim 4, wherein each of the upstream end portions of the plurality of perforated pipes is connected to a branch portion formed in the upper portion of the pipe wall of the water supply side connecting pipe. The underground irrigation according to any one of claims 1 to 5, wherein a washing riser pipe into which a washing machine can be inserted into the perforated pipe is provided at each of the upstream end portions of the plurality of perforated pipes. system. The underground irrigation system according to claim 6, wherein the cleaning rising pipe is a rising pipe constituting a water supply control device provided at each of the upstream end portions of the plurality of perforated pipes. The underground irrigation system according to any one of claims 1 to 7, wherein the plurality of perforated pipes extend along the short side direction of the field and are arranged so as to be arranged at predetermined intervals in the long side direction of the field. .. The underground irrigation system according to any one of claims 1 to 8, wherein the drainage control device includes a box having a water level setting mechanism. An underground irrigation system that supplies water to the field from underground.
A plurality of perforated pipes buried in the basement of the field at predetermined intervals,
The upstream end portions of the plurality of perforated pipes are connected to each other, and the water supply side connecting pipe that guides the water supplied from the water supply channel to each perforated pipe, and the downstream end portions of the plurality of perforated pipes are connected to each other. It is equipped with a drainage side connecting pipe that guides the water discharged from each perforated pipe to the drainage channel.
An underground irrigation system in which a downstream end of the water supply side connecting pipe is connected to the drainage channel via a valve member capable of opening and closing the water supply side connecting pipe.

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