JP6504398B2 - Drainage device - Google Patents

Description

  The present invention relates to a drainage device, and is particularly used in fields where rotation of fields is performed, for example, draining field water above a set water level and adjusting the water level at the time of flooding, and at the time of dry field at the time of upland etc. A new drainage system for the drainage of

  Conventionally, in order to adjust the water level of the surface water to the paddy field according to the growing process of the rice, drainage device that discharges the surface water above the set water level and adjusts the water level (also referred to as water level regulator or drainage port) ) Is provided.

  For example, Patent Document 1 discloses an example of a conventional drainage device. The drainage device of Patent Document 1 includes an outer cylinder and an inner cylinder inserted therein. A window is formed on the upper side wall of the outer cylinder, and the opening height of the window can be arbitrarily changed by moving the inner cylinder that functions as a weir up and down. Further, a drain pipe is connected to the downstream end of the outer cylinder. At the time of flooding, the upper end of the inner cylinder is adjusted so that the upper end of the inner cylinder comes to the desired height of the field water level, and excess rice surface water exceeding the upper end of the inner cylinder is discharged to the drainage pipe, so that the water level of the surface water becomes the desired height. Will be kept.

Patent Document 1: Japanese Patent Application Laid-Open No. 11-28028 [A01G 25/00]

  In recent years, in order to improve paddy farming, there is an increase in the number of fields where rice fields are used alternately in fields and fields every few years. Here, during the upland farming period, in order to prevent moisture damage, it is necessary to properly drain water from the deep ditch or the ground. In addition, it is necessary to drain the water from the deep ditch or underground properly, even in the case of reverse work in the winter season or when the water is simply drained from the field to dry it.

  However, with the technology of Patent Document 1, although it is possible to discharge the surface water and adjust its water level, it is not possible to discharge the drainage from the deep ditch or underground. Therefore, it is conceivable to separately provide drainage facilities for draining water from deep grooves or underground in the field, but this increases the cost of facilities, and it is difficult to carry out particularly in small-scale fields where part-time farmers etc. .

  Further, in the technique of Patent Document 1, the inner cylinder is formed with a slit and fitted into the outer cylinder in a press-fit state, and the slit is expanded by a spring in a direction to expand the slit. It is in close contact with the outer peripheral surface of the tube. However, if the outer cylinder and the inner cylinder installed in the vertical direction are in close contact with each other, the inner cylinder may slide down, and there is a possibility that the water level adjustment of the paddy water can not be appropriately performed.

  Therefore, the main object of the invention is to provide a novel drainage device.

  Another object of the present invention is to provide a drainage device capable of draining paddy water above a set water level and adjusting the water level and discharging drainage from deep grooves and underground with a simple configuration. is there.

  Still another object of the present invention is to provide a drainage device which can prevent an unintended lowering of the inner cylinder and can appropriately adjust the water level of the paddy water.

  The first invention is a drainage device for draining the surface water above the set water level and adjusting the water level at the time of springing, and discharging the drainage from the deep ditch or the ground at the time of dry field, It has an outer cylinder formed with a drainage inlet and outlet formed at the lower end of the side wall, and a rice field water inlet formed at the upper end, and is inserted into the outer cylinder and moved up and down by moving up and down. An inner cylinder capable of changing the height position of the inlet, a sealing portion sealing the drain inlet in an openable / closable manner, a first engaging portion provided on the inner cylinder, and an outer cylinder, the first engaging portion It is a drainage device provided with the 2nd engaging part which holds an inner cylinder in desired height position by latching.

  In the first invention, the drainage device has an outer cylinder and an inner cylinder, and is used in a field where rice field conversion is performed. The outer cylinder is formed in a bottomed vertical tube with an open upper end, and a drainage inlet and an outlet are formed at the lower end of the side wall. The inner cylinder is inserted into the outer cylinder. By moving the inner cylinder up and down, the height position of the surface water inlet formed at the upper end portion is changed. Further, at the drainage inlet of the outer cylinder, a sealing portion such as a lid for sealing the drainage inlet so as to be able to open and close is provided. Furthermore, the outer cylinder is provided with a second engagement portion that holds the inner cylinder at a desired height position by locking the first engagement portion provided on the inner cylinder.

  In such a drainage device, when the water is drained, in a state where the drainage inlet is sealed, the paddy water having a level higher than the set water level flowing into the outer cylinder from the rice water inlet is discharged from the outlet. On the other hand, at the time of dry paddy, the drainage inflow port is opened, and the drainage from the deep groove or underground flowing into the outer cylinder from the drainage inflow port is discharged from the drainage port.

  According to the first aspect of the invention, the water level of the surface water can be adjusted by adjusting the height of the surface water inlet by the vertical movement of the inner cylinder, and the deep groove can be formed by opening and closing the drainage inlet using the sealing portion. Or you can control the possibility of drainage from the ground. That is, with a simple configuration, it is possible to discharge the field water above the set water level and adjust the water level, and also to discharge the drainage from the deep ditch or underground. Moreover, since the configuration is simple, the manufacturing cost and the installation cost of the drainage device can be reduced at a low cost.

  Furthermore, since the inner cylinder is held at the desired height position by locking the first engaging portion at the second engaging portion, it is possible to prevent the unintended lowering of the inner cylinder, and the water level of the surface water Adjustment can be made properly.

  A second invention is according to the first invention, and the lower portion of the inner cylinder is formed such that the axial length is different in the circumferential direction, and the outer cylinder has a projection which protrudes from the inner circumferential surface The first engagement portion is a lower end of the inner cylinder, and the second engagement portion is a protrusion.

  In the second aspect of the invention, the inner peripheral surface of the outer cylinder is formed with a projection for locking the lower end of the inner cylinder. Further, the axial length (length from the upper end to the lower end of the lower portion) of the lower portion of the inner cylinder is formed to be different in the circumferential direction. Thus, when moving the inner cylinder up and down, the lower end of the inner cylinder is locked to the projection of the outer cylinder at any height position by rotating the inner cylinder up and down while rotating the inner cylinder. It is possible to That is, in the second aspect of the present invention, the inner cylinder is held at a desired height position by locking the lower end of the inner cylinder, which is the first engagement portion, with the projection of the outer cylinder, which is the second engagement portion. Ru.

  According to the second aspect of the invention, the inner cylinder can be held at a desired height position by a simple operation of moving the inner cylinder up and down while rotating it in the circumferential direction.

  A third invention is according to the second invention, and the lower end of the inner cylinder is formed in a step shape.

  In the third invention, the lower end of the inner cylinder which is the first engaging portion is formed in a step shape. As a result, the lower end of the inner cylinder and the projection of the outer cylinder which is the second engagement portion come into surface contact in the horizontal direction, so that the unintentional lowering of the inner cylinder can be prevented more reliably.

  A fourth invention is according to any one of the first to third inventions, and includes a water blocking member in close contact with the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder.

  In the fourth invention, the water blocking member is a rubber ring formed of, for example, a synthetic rubber, and is in close contact with each of the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder to ensure water resistance therebetween. Do.

  According to the fourth invention, it is possible to prevent water leakage from the gap between the outer cylinder and the inner cylinder. Moreover, since the inner cylinder is held also by the adhesive force of the water blocking member, it is possible to more reliably prevent the unintentional lowering of the inner cylinder.

  According to the present invention, by adjusting the height of the paddy water inlet by the vertical movement of the inner cylinder, it is possible to adjust the water level of the paddy water, and by opening and closing the drainage inlet using the sealing portion, Can control the drainage from inside. That is, with a simple configuration, it is possible to drain the field water above the set water level and adjust the water level, and to discharge the drainage from the deep ditch or underground. Moreover, since the configuration is simple, the manufacturing cost and the installation cost can be reduced.

  Furthermore, since the inner cylinder is held at the desired height position by locking the first engaging portion at the second engaging portion, it is possible to prevent the unintended lowering of the inner cylinder, and the water level of the surface water Adjustment can be made properly.

  The above-described objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments given with reference to the drawings.

It is an illustration figure which shows a mode that the drainage apparatus which is one Example of this invention was installed in the field. It is an illustration figure which shows the external appearance of the drainage apparatus of FIG. It is sectional drawing which shows the drainage apparatus of FIG. It is sectional drawing which shows the outer cylinder with which the drainage apparatus of FIG. 1 is equipped. It is an illustration figure which shows the inner cylinder with which the drainage apparatus of FIG. 1 is equipped, (A) is sectional drawing of an inner cylinder, (B) is a front view of an inner cylinder. It is sectional drawing which shows the cap with which the drainage apparatus of FIG. 1 is equipped. It is an illustration figure which shows a mode when the water level adjustment of the field water is performed using the drainage apparatus of FIG. It is an illustration figure which shows a mode when draining the drainage from a deep ditch or the ground using the drainage apparatus of FIG. It is sectional drawing which shows the drainage apparatus which is another Example of this invention. It is sectional drawing which shows the drainage apparatus which is another Example of this invention. It is an illustration figure which shows the 1st engaging part which the inner cylinder of the drainage apparatus of FIG. 10 has. It is sectional drawing which shows the drainage apparatus which is another Example of this invention. It is an illustration figure which shows the external appearance of the lid | cover with which the drainage apparatus of FIG. 12 is provided. It is sectional drawing which shows the drainage apparatus which is another Example of this invention. It is an illustration figure which shows the external appearance of the lid with which the drainage device of FIG. 14 is provided. It is an illustration figure which shows the upper part of the drainage apparatus which is another Example of this invention, Comprising: (A) is an illustration figure which shows a state when an inner cylinder is in the lowest position, (B) is an inner cylinder. Is an illustrative view showing a state when it is at the uppermost position. It is an illustration figure which shows the upper part of the drainage apparatus which is another Example of this invention, Comprising: (A) is an illustration figure which shows a state when an inner cylinder is in the lowest position, (B) is an inner cylinder. FIG.

  Referring to FIG. 1, a drainage device 10 according to an embodiment of the present invention includes an outer cylinder 12, an inner cylinder 14, a lid 16, and the like, and is used by being buried in a field 100 or the like performing field rotation. And when it is flooded, that is, when using the field 100 as a paddy field, while draining the field water of a set water level and performing the water level adjustment, at the time of dry field, that is, when making the field 100 dry and using it as a field Drain water or underground water. However, the drainage device 10 is appropriately used not only in the field 100 where rice fields are converted every few years, but also in fields where back work is done in winter, and fields where it is time to simply drain water and dry.

  Hereinafter, the configuration of the drainage device 10 will be described with reference to FIGS. As shown in FIGS. 2 and 3, the drainage device 10 is formed of a synthetic resin such as hard vinyl chloride and the like, and is an outer cylinder 12 having a vertical tubular shape and an inner cylinder fitted so as to be vertically movable with respect to the outer cylinder 12. And a lid 16 detachably provided to the drainage inlet 20 formed in the outer cylinder 12. As described later in detail, by moving the inner cylinder 14 up and down, the height position of the rice water inlet 30 formed at the upper end of the inner cylinder 14 is changed, and the lid 16 is attached and removed. 20 is opened and closed. The upper end portion of the inner cylinder 14 protrudes from the upper end of the outer cylinder 12 at the lowermost position thereof. The vertical length (height) of the drainage device 10 in the state where the inner cylinder 14 is at the lowermost position is, for example, 350 mm.

  As shown in FIG. 4, the outer cylinder 12 is formed in a bottomed vertical tubular shape with an open upper end, including a side wall 12 a formed in a substantially cylindrical shape and a bottom wall 12 b provided at the lower end thereof. Further, at the lower end of the side wall 12a, the drainage inlet 20 and the outlet 22 are formed at positions facing each other. The inner diameters of the drainage inlet 20 and the outlet 22 are, for example, 150 mm.

  The drainage inlet 20 is a deep groove formed in the field 100 or an opening for draining drainage from the ground into the outer cylinder 12 and is formed in a short tubular shape laterally projecting from the lower end portion of the side wall 12a. . A lid 16 is removably attached to the drainage inlet 20. On the other hand, the discharge port 22 is an opening for discharging the water flowing into the outer pipe 12 to the outside, and is formed in a short tubular shape which protrudes laterally from the lower end portion of the side wall 12a. The outlet 22 is also used as a connection with the drainage pipe 106 (see FIG. 1) extending to the drainage channel 104.

  In this embodiment, the lower end of the side wall 12a is formed in a horizontal tubular shape, and both ends of the horizontal tubular portion are used as the drainage inlet 20 and the outlet 22. Further, the central bottom portion of the horizontal tubular portion is the bottom wall 12 b of the outer cylinder 12. In addition, since the basic structure of such an outer cylinder 12 can be formed only by connecting a general-purpose straight pipe to a general-purpose cheese joint (90 ° Y), the manufacturing cost of the drainage device 10 can be suppressed. .

  Further, an annular groove 24 extending in the circumferential direction is formed on the inner peripheral surface of the upper end portion of the side wall 12a, and a water blocking member 26 such as a rubber ring formed of synthetic rubber or elastomer is formed in the annular groove 24. It is attached. The water blocking member 26 is formed in an annular shape extending over the entire length of the annular groove 24 and is in close contact with the inner surface of the annular groove 24 (that is, the inner peripheral surface of the outer cylinder 12) and the outer peripheral surface of the inner cylinder 14. , To ensure the water barrier during this time.

  Further, on the inner peripheral surface of the side wall 12a, a projection (second engagement portion) 28 is provided for locking a lower end (first engagement portion) 14b of an inner cylinder 14 described later. The protrusion 28 is a protrusion having a rectangular parallelepiped shape, a short cylindrical shape, or a hemispherical shape, and is formed above the drainage inflow port 20. In this embodiment, the projection 28 is formed by attaching an L metal fitting to the inner peripheral surface of the side wall 12a using a bolt. However, the method of forming the protrusions 28 can be changed as appropriate. For example, the bolt may be attached to the side wall 12a so that the end of the bolt protrudes from the inner circumferential surface of the side wall 12a, and the tip of the bolt may be the projection 28.

  As shown in FIG. 5, the inner cylinder 14 is formed in a cylindrical shape with both ends open. The opening at the upper end of the inner cylinder 14 functions as a rice water inlet 30 for allowing the surplus rice water supplied to the field 100 to flow into the outer cylinder 12. The axial length of the inner cylinder 14 is, for example, 350 mm, and its inner diameter is, for example, 140 mm.

  A substantially C-shaped grip portion (handle) 32 is provided at the upper end portion of the inner cylinder 14. However, the shape of the grip portion 32 can be changed as appropriate. For example, the grip portion 32 may be formed in a bowl shape protruding outward from the upper end portion of the inner cylinder 14.

  Further, in this embodiment, the lower portion 14a of the inner cylinder 14 is formed in a bowl shape which is cut in a diagonal direction from one side surface. That is, the lower end 14b of the inner cylinder 14 is an inclined surface, and the axial length (the length from the upper end to the lower end of the lower portion 14a) h of the lower portion 14a of the inner cylinder 14 is different in the circumferential direction Is formed. As a result, when moving the inner cylinder 14 up and down, by moving the inner cylinder 14 in the circumferential direction while moving the inner cylinder 14 up and down, the projection of the outer cylinder 12 (second The lower end (first engaging portion) 14b of the inner cylinder 14 can be locked (abutted) on the engaging portion 28 (see FIGS. 3, 7 and 8). Therefore, the inner cylinder 14 can be held at a desired height position, and the unintentional lowering of the inner cylinder 14 is surely prevented. The difference between the longest portion and the shortest portion of the axial length h of the lower portion 14a of the inner cylinder 14 is, for example, 150 mm.

  Further, on the outer peripheral surface of the inner cylinder 14, a scale unit 50 including scale lines and numerical values is provided. The scale portion 50 is a mark indicating the protruding height of the inner cylinder 14 from the ground surface of the field 100, that is, the height position of the paddy water inlet 30. The worker can set the water level of the paddy water to a desired water level, for example, by aligning the scale line indicating the desired water level of the scale unit 50 with the upper end of the side wall 12 a of the outer cylinder 12.

  In this embodiment, a scale of 25 mm from 0 mm (lowermost position) to 150 mm (uppermost position) is displayed in a diagonal direction corresponding to the lower end 14 b of the inner cylinder 14. The scale portion 50 is disposed in an oblique direction because the inner cylinder 14 is moved up and down while being rotated in the circumferential direction. Thereby, the scale portion 50 can be confirmed from the same direction regardless of the height position of the inner cylinder 14. Also, by confirming that the scale portion 50 is in a predetermined direction (for example, the side of the collar 102), drainage is performed that the lower end 14b of the inner cylinder 14 is locked by the projection 28 of the outer cylinder 12 This can be easily confirmed from the outside without looking into the inside of the device 10.

  As shown in FIG. 6, the lid 16 is a sealing portion that seals the drainage inlet 20 so as to be able to open and close, and a fitting portion 16 a formed in a short cylindrical shape and one end of the fitting portion 16 a And a disk-like sealing portion 16b to be sealed. For example, a water blocking member 34 such as a rubber ring is mounted on the inner peripheral surface of the fitting portion 16 a of the lid 16. The lid 16 is detachably and watertightly attached to the drainage inlet 20 of the outer cylinder 12 through the water blocking member 34.

Such a drainage device 10 is buried in a field 100 or the like and used, as shown in FIG. For example, the drainage device 10 is provided in the field 100 at a ratio of arranging one drainage device 10 with respect to the field area of 2000 to 4000 m ² . Specifically, a portion of the weir 102 on the side of the field 100 is excavated so as not to reduce the acreage 100 of the field 100, and the drainage device 10 is embedded therein. At this time, the drainage device 10 is embedded such that the upper end of the inner cylinder 14 is substantially flush with the ground surface of the field 100 in a state where the position of the inner cylinder 14 with respect to the outer cylinder 12 is at the lowermost position. Further, a drainage pipe 106 extending to the drainage path 104 is connected to the drainage port 22 by adhesive bonding or rubber ring bonding or the like, and the drainage inlet 20 is disposed in the ground with the lid 16 attached. However, when the deep groove is provided in the field 100, the drainage inlet 20 may be disposed at the downstream end of the deep groove.

  Then, during flooding, as shown in FIG. 7, the inner cylinder 14 is rotated and raised so that the upper end of the inner cylinder 14, ie, the paddy water inlet 30, is at the desired water level of the paddy water. Adjust the position. At this time, the lower end 14 b of the inner cylinder 14 is locked to the projection 28 of the outer cylinder 12, whereby the inner cylinder 14 is fixed and held at a desired height position, and an unintentional lowering is prevented. In addition, since the inner cylinder 14 tries to maintain its height position and circumferential position even by the adhesion (resistance) of the water blocking member 26, unintentional lowering of the inner cylinder 14 is more reliably prevented.

  When the irrigation water is supplied to the field 100 in such a state, after the water level of the surface water reaches the height position of the surface water inlet 30 of the inner cylinder 14, surplus water above the set water level is the surface water inlet 30. Flows into the outer cylinder 12 and is discharged from the discharge port 22. Then, it is conveyed to the drainage channel 104 through the drainage pipe 106. As a result, the water level of the surface water of the field 100 is maintained at the height position of the surface water inlet 30 of the inner cylinder 14. In this embodiment, by moving the inner cylinder 14 up and down, it is possible to adjust the height position of the paddy water inlet 30 with respect to the ground surface of the agricultural field 100, that is, the water level of paddy water between 0 and 150 mm. is there.

  On the other hand, at the time of dry field, as shown in FIG. 8, the soil around the drainage device 10 is dug up to expose the lid 16 and the drainage inlet 20. Thereafter, the lid 16 is removed, and the drainage inlet 20 of the outer cylinder 12 is opened. In addition, the inner cylinder 14 is raised to a height position that does not interfere with the inflow of water from the drainage inflow port 20. When the drainage inlet 20 is opened, surplus underground water (or deep groove water) flows into the outer cylinder 12 from the drainage inlet 20 and is discharged from the outlet 22. Then, it is conveyed to the drainage channel 104 through the drainage pipe 106. As a result, the farmland 100 can be in a dry state and can suitably perform upland farming.

  According to this embodiment, the water level of the paddy water can be adjusted by adjusting the height of the paddy water inlet 30 by the up and down movement of the inner cylinder 14. In addition, by opening and closing the drainage inflow port 20 by attaching and detaching the lid 16, it is possible to control whether drainage from the deep ditch or the ground is possible. That is, with a simple configuration, it is possible to discharge the field water above the set water level and adjust the water level, and also to discharge the drainage from the deep ditch or underground.

  Moreover, since the configuration of the drainage device 10 is simple, the manufacturing cost and the installation cost can be reduced.

  Further, the lower end 14b of the inner cylinder 14 which is the first engaging portion is locked to the projection 28 of the outer cylinder 12 which is the second engaging portion, whereby the inner cylinder 14 is held at a desired height position. As a result, it is possible to prevent an unintended lowering of the inner cylinder 14 and to appropriately adjust the water level of the paddy water.

  Furthermore, since the drainage inflow port 20 is provided at the same height position as the drainage port 22, the height of the drainage device 10 can be reduced, and it is possible to cope with the case where the drainage path 104 of the drainage destination is shallow. That is, the present invention can be suitably used for a small-scale field 100 where infrastructure maintenance such as drainage separation is not sufficient.

  In the above-described embodiment, the drainage inlet 20 is disposed as it is in the ground, but is not limited thereto. For example, an underground pipe such as a perforated drainage pipe or a bullet culvert may be provided in the ground of the field 100, and the drainage inlet 20 may be disposed in the vicinity of the downstream end. When a culvert tube, a bullet culvert or a deep groove, etc. are provided in the field 100, the cost is increased by the amount of laying the culvert tube etc. However, drainage can be efficiently collected from the entire field 100. Drainage performance can be further improved.

  Further, in the above-described embodiment, the drainage inlet 20 and the outlet 22 are provided at positions facing each other, that is, at positions shifted by 180 ° in the circumferential direction. However, the positional relationship in the circumferential direction between the drainage inlet 20 and the outlet 22 is not particularly limited, and the drainage inlet 20 and the outlet 22 may be provided at positions shifted by an appropriate angle such as 90 ° or 120 °. You can also. The drainage inlet 20 can also be formed at a position higher than the outlet 22.

  Furthermore, although the lower end 14b of the inner cylinder 14 which is a 1st latching | locking part was made into the inclined surface in the above-mentioned Example, it is not limited to this. For example, as in the embodiment shown in FIG. 9, the lower end 14b of the inner cylinder 14 which is the first locking portion is formed in a step shape in which a horizontal surface and a vertical surface are alternately repeated. The axial length of the portion 14a can be circumferentially different.

  In the embodiment shown in FIG. 1, since the lower end 14b of the inner cylinder 14 is an inclined surface, the lower end of the inner cylinder 14 when a large force acts unexpectedly on the inner cylinder 14 downward. There is a slight possibility that the inner cylinder 14 may be lowered while rotating while sliding on the projection 28 b. On the other hand, in the embodiment shown in FIG. 9, since the lower end 14b of the inner cylinder 14 is formed in a step shape, the lower end 14b of the inner cylinder 14 and the projection 28 come into surface contact in the horizontal direction. As a result, even when a large force acts downward on the inner cylinder 14, the inner cylinder 14 is prevented from rotating and falling. Therefore, according to the embodiment shown in FIG. 9, the unintentional lowering of the inner cylinder 14 can be prevented more reliably.

  Furthermore, in the above-described embodiment, the lower end 14b of the inner cylinder 14 is the first locking portion, but the aspect of the first locking portion provided on the inner cylinder 14 is not limited to this. For example, as in the embodiment shown in FIG. 10, the locking groove 42 formed on the outer peripheral surface of the inner cylinder 14 may be used as the first locking portion.

  Specifically, as shown in FIGS. 10 and 11, a protrusion (second engagement portion) 38 is formed on the inner peripheral surface of the side wall 12 a of the outer cylinder 12. The protrusion 38 is a protrusion having a rectangular solid shape, a short cylindrical shape, a hemispherical shape, or the like, and is formed at a substantially central portion in the height direction of the side wall 12 a. On the other hand, on the outer peripheral surface of the inner cylinder 14, a guide groove 40 extending upward from the lower end 14a is formed, and a plurality of locking grooves (first fitting portions) 42 branched laterally from the guide groove 40 are formed. It is formed at predetermined intervals in the vertical direction.

  Then, when moving the inner cylinder 14 up and down, the projection 38 is fitted in the guide groove 40 and the inner cylinder 14 is moved up and down so that the projection 38 moves along the guide groove 40. When the inner cylinder 14 is held at a desired height position, the inner cylinder 14 is slightly rotated in the circumferential direction to fit the projection 38 and the engagement groove 42, and the engagement groove is formed by the projection 38. 42 may be locked.

  Also in the embodiment shown in FIG. 10, as in the embodiment shown in FIG. 1, the field water above the set water level can be discharged and the water level can be adjusted with a simple configuration, and the drainage from the deep ditch or the ground is discharged. it can. Further, the locking groove 42 of the inner cylinder 14 which is the first engaging portion is locked to the projection 38 of the outer cylinder 12 which is the second engaging portion, so that the inner cylinder 14 is at a desired height position. Since it is hold | maintained, the unintentional fall of the inner cylinder 14 can be prevented and the water level adjustment of a field water can be performed appropriately.

  Moreover, in the above-mentioned embodiment, although the drainage inflow port 20 of the outer cylinder 12 is formed in a slightly longer short tubular shape, the shape of the drainage inflow port 20 can be appropriately changed if it can be opened and closed by the sealing portion is there. Moreover, according to the shape of the drainage inflow port 20, the shape of a sealing part can also be changed suitably.

  For example, as in the embodiment shown in FIG. 12, the axial length of the drainage inlet 20 of the outer cylinder 12 can be made extremely short. In this case, for example, a lid 16 as shown in FIG. 13 may be used. As shown in FIG. 13, the lid 16 seals the fitting portion 16a formed in a short cylindrical shape and one end of the fitting portion 16a, and has a disk shape having a diameter larger than that of the fitting portion 16a. And the sealing portion 16 b. The sealing portion 16 b is provided with a substantially C-shaped grip portion (handle) 16 c. Further, a water blocking member 34 such as a rubber ring is mounted on the outer peripheral surface of the fitting portion 16 a of the lid 16. The lid 16 is detachably and watertightly attached to the drainage inlet 20 of the outer cylinder 12 through the water blocking member 34.

  According to the embodiment shown in FIG. 12, since the axial length of the drainage inlet 20 of the outer cylinder 12 is shortened, when digging up the soil around the drainage device 10 in order to remove the lid 16 at the time of dry rice, The amount of excavation can be reduced.

  Also, for example, as in the embodiment shown in FIG. 14, the lid (sealing portion) 16 can be formed in a partition plate shape. In the embodiment shown in FIG. 14, an insertion port 52 having a rectangular cross section extending in the vertical direction is formed at the upper portion of the drainage inflow port 20, and the lid 16 is attached and detached in the vertical direction via the insertion port 52. The lid 16 is a plate-like body having a semidisk-like lower portion 16d and a rectangular plate-like upper portion 16e as shown in FIG. 15, and the peripheral side of the lower portion 16d of the lid 16 is a drainage flow It has a shape along the inner peripheral surface of the inlet 20. Further, a substantially C-shaped grip (handle) 16 f is provided at the upper end of the upper portion 16 e of the lid 16. Furthermore, the lid 16 is provided with a strip-like water blocking member 52 formed of a sponge-based rubber or the like so as to cover the entire contact portion with the drainage inlet 20.

  According to the embodiment shown in FIG. 14, when removing the lid 16 at the time of dry field, it is only necessary to move the lid 16 upward, so the amount of digging when digging the soil around the drainage device 10 can be further reduced. Moreover, since the lid 16 can be attached and detached only by moving the lid 16 up and down, the drainage inlet 20 can be easily opened and closed.

  Moreover, the shape of the discharge port 22 of the outer cylinder 12 can also be suitably changed, as long as it can be connected to the drain pipe 106 in a watertight manner. For example, the outlet 22 may be in the form of a port instead of the port.

  Furthermore, in the above-described embodiment, the scale portion (first scale portion) 50 is provided on the outer peripheral surface of the inner cylinder 14. However, instead of the scale portion 50 together with the scale portion 50, the upper surface of the inner cylinder 14 is provided. A scale (second scale) 54 may be provided on the end face.

  For example, as shown in FIG. 16, a scale portion including scale lines arranged at predetermined intervals in the circumferential direction with respect to the upper end surface of the inner cylinder 14 and indicating the height position from the lowermost position to the uppermost position of the inner cylinder 14 54 can also be provided. At this time, an alignment mark portion 56 indicating a reference position (reference direction) serving as a reference for scale alignment is provided on the upper end surface of the outer cylinder 12. The operator can set the water level of the paddy water to a desired water level by aligning the scale line indicating the desired water level of the scale unit 54 with the alignment mark unit 56. That is, in the embodiment shown in FIG. 16, the height position of the inner cylinder 14 is defined by the rotation angle of the inner cylinder 14.

  For example, as shown in FIG. 17, a collar 14 c may be formed at the upper end of the inner cylinder 14 to enlarge the upper end surface of the inner cylinder 14 and provide a scale 54 including scale lines and numerical values. However, even when the flange portion 14c is not formed on the upper end portion of the inner cylinder 14 as shown in FIG. 16, the scale portion 54 may include a numerical value.

  According to the embodiment shown in FIG. 16 or 17, since the scale portion 54 is provided on the upper end surface of the inner cylinder 14, the scale portion 54 can be easily visually observed from above, and the height position of the inner cylinder 14 is adjusted. Becomes easy. Further, since the upper end surface of the inner cylinder 14 does not rub against the water blocking member 26, the scale portion 54 provided on the upper end surface of the inner cylinder 14 is unlikely to disappear.

  The above-described specific numerical values such as dimensions are merely examples, and can be changed as appropriate according to the product specifications and the like.

10 ... drainage device 12 ... outer cylinder 14 ... inner cylinder 14 b ... lower end (first engagement portion) of the inner cylinder
16 ... Lid (sealed part)
20 ... drainage inflow port 22 ... exhaust port 26 ... water blocking member 28, 38 ... projection (second engaging portion)
30 ... Field water inlet 42 ... Locking groove (first engaging portion)
100 ... field 102 ... 104 104 ... drainage channel

Claims (4)

It is a drainage device that discharges the field water above the set water level and adjusts the water level when flooding, and discharges drainage from the deep ditch or underground during dry paddy,
An outer cylinder formed in a bottomed vertical tube with an open upper end and having a drainage inlet and an outlet formed at the lower end of the side wall,
An inner cylinder having a rice field water inlet formed at the upper end, which is inserted into the outer cylinder and vertically moved to change the height position of the rice field water inlet,
A sealing portion for sealing the drainage inlet so as to open and close;
A first engaging portion provided in the inner cylinder, and a second engaging portion provided in the outer cylinder and holding the inner cylinder at a desired height position by locking the first engaging portion Equipped with a drainage device. The lower portion of the inner cylinder is formed to have different axial lengths in the circumferential direction,
The outer cylinder has a protrusion which protrudes from the inner circumferential surface,
The drainage device according to claim 1, wherein the first engagement portion is a lower end of the inner cylinder, and the second engagement portion is the protrusion.   The drainage device according to claim 2, wherein the lower end of the inner cylinder is formed in a step shape.   The drainage device according to any one of claims 1 to 3, further comprising a water blocking member in close contact with the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder.

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