JP2006271319A - Lock gate with groundwater level regulation function for field - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock gate with a groundwater level regulatory function for a field, with which the used amount of piping is reduced, an installation space is saved and an installation operation is simplified. <P>SOLUTION: The lock gate with a groundwater level regulatory function for a field has a rising pipe part 5 stood on a branch pipe 4 equipped with a drainage part 4A communicating with a culvert pipe 3, is furnished with a water stop valve 6 for preventing drainage to a drainage part 4A, a first operation part 7 for opening and closing operation of the water stop valve 6, an inlet pipe conduit 8 during a water stop, with which a flowing water from the culvert pipe 3 during a water stop by the water stop valve 6 is introduced into the rising pipe part 5, a drainage pipe conduit 9 for draining the flowing water introduced into the rising pipe part 5 during a water stop to a drainage channel 2 and with a water level regulation pipe 10 for regulating extension and contraction in the vertical direction in the rising pipe part 5. A second operation part 11 for inserting and arranging the first operation part 7 of the water stop valve 6 in the water level regulation pipe 10 and operating extension and contraction of the water level regulation pipe 10 is installed, the second operation part 11 is operational by the upper opening part 5A of the rising pipe part 5 and an overflow from the top of the water level regulation pipe 10 regulated in extension and contraction by the second operation part 11 is drained from the drainage pipe conduit 9 to the drainage channel 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water tank with a groundwater level adjusting function for agricultural fields.

  Underground in the field is a culvert pipe that drains irrigation water supplied to the field and groundwater that has penetrated underground into a drainage channel such as a drainage channel provided along the fence.

  In addition, a water tank is provided at the downstream end portion of the culvert tube. For example, the operation part of the water tank is provided in an exposed state on the ground surface such as a bag through a vertical cylinder, and the operation part is operated. The drainage can be opened and closed.

  Conventionally, an apparatus for adjusting the water level of the rice field using a culvert tube provided with this water tank has been proposed (see Patent Document 1).

  Briefly explaining this Patent Document 1, a water intake pipe is branched and provided in the middle of the downstream side of the culvert pipe provided with a water tank (vertical pipe), and an inverted T-shaped joint tube is provided at the protruding tip of the water intake pipe. Are connected to each other, and the vertical tube of the joint tube is exposed to the ground surface, and the upward tube that rises inside the vertical tube with a smaller diameter than the joint tube at the protruding tip of the intake tube in the joint tube Are connected to each other, and a water level adjustment pipe that can be expanded and contracted in the vertical direction is provided at the upper end of the upward pipe, and an operation portion that can be expanded and contracted in the vertical direction is provided at the upper end of the vertical cylinder.

  Then, when the water tank is closed (water stopped), water flows into the intake pipe branched from the culvert pipe and conducts water to the upward pipe. At this time, the position of the upper end of the water level adjustment pipe is adjusted to the water level setting level of the rice field. By doing so, the amount of water for irrigation to the rice field can be adjusted.

JP2003-111526A

  In the case of such a conventional patent document 1, a water intake pipe for installing a vertical pipe for adjusting the water level is branched from a culvert pipe provided with a water tank, and a drain pipe from this branch pipe to the drain is also connected. Therefore, the culvert pipe that leads to the drainage channel and the drainage pipe from the branched intake pipe exist in parallel.

  Therefore, the amount of piping required to install the equipment is large and the cost is high, and the piping installation location of the intake pipe and the drain pipe communicating with this must be secured separately from the installation location of the underdrain pipe. The range of ground digging and backfilling work at the time of installation was wide, and it was a laborious work.

  The present invention pays attention to the problems of such a conventional water level control device for a farm, and intends to solve this problem. At least a vertical pipe for installing a water tank and a vertical pipe for installing a water level control pipe are used as a culvert pipe. It is installed in the same pipe that communicates with each other to reduce the amount of piping used by unifying the water conveyance path in each vertical pipe, and at least this water conveyance path is within the installation space of approximately one conventional underdrain pipe. It is possible to provide an epoch-making water tank with a groundwater level adjustment function for an agricultural field that can be installed in the ground and simplifies the installation work.

  Further, in the case of the above-mentioned Patent Document 1, the water level adjustment is performed by opening and closing the water tank and adjusting the water level adjustment pipe. The operation part of the water tank and the operation part of the water level adjustment pipe are connected via separate vertical cylinders. Since it is provided near the ground surface, the operator has to operate each operation unit located in this different position, and if the position of each operation unit is close, it is sufficient to change the direction of the body, When the position of the operation unit is far away, it has been troublesome work such as having to move one by one and perform the operation.

  The present invention is intended to solve such a problem, and the operation part of the water tank (stop valve) and the operation part of the water level control pipe are arranged from one rising pipe part to the vicinity of the ground surface. The operator can perform the opening and closing operation of the stop cock and the adjustment operation of the water level adjustment pipe in a series of operations at the same place without changing the direction of the body or moving it. It is intended to provide a revolutionary water tank with a groundwater level adjustment function for an agricultural field with a simple structure and excellent workability.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A water tank with a groundwater level adjusting function for a field, which is embedded in the underground of the field 1 and provided to a culvert pipe 3 for draining the soil water of the field 1 to the drainage channel 2, and a drain pipe 24 communicating with the culvert pipe 3. In addition, the first riser pipe part 25 and the second riser pipe part 26 are erected in close proximity to each other, and the upper openings of the first riser pipe part 25 and the second riser pipe part 26 25A and 26A are respectively exposed on the ground surface, and a stop cock 6 is provided in the first riser pipe portion 25 so that the drain pipe 24 is closed to prevent drainage. The stop cock 6 can be opened and closed. A first operation portion 7 that can open and close the stop cock 6 is provided, and the first operation portion 7 is provided so that it can be opened and closed at the upper opening 25A of the first riser pipe portion 25. When water is stopped by the stopper 6, the flowing water from the culvert pipe 3 is introduced into the second rising pipe portion 26, and the flowing water introduced into the second rising pipe portion 26 is drained. A drain pipe 9 is provided for draining downstream of the stop cock 6 in the pipe 24 in the drain direction. The drain pipe 9 is disposed in the second rise pipe section 26 and vertically in the second rise pipe section 26. A water level adjustment pipe 10 that can be expanded and contracted is provided, and a second operation part 11 that can adjust the position of the upper end of the water level adjustment pipe 10 by expanding and contracting the water level adjustment pipe 10 is provided in the water level adjustment pipe 10, and The second operation part 11 is provided so as to be operated at the upper opening 26A of the second riser pipe part 26, and the overflow from the upper end part of the water level adjustment pipe 10 which is expanded and contracted by the second operation part 11 occurs. By draining from the drainage pipe 9 to the drainage path 2 through the drainage direction downstream side of the stop cock 6 in the drainage pipe 24, the groundwater level of soil water in the field 1 is adjusted and set. The present invention relates to a water tank with a groundwater level adjustment function for a farm characterized by being configured to obtain.

  In addition, the first riser pipe part 25 and the second riser pipe part 26 are erected in the state of being juxtaposed along the drainage direction of the drainage pipe 24, and the drainage downstream side of the drainage pipe 24 in the drainage direction If the first riser pipe part 25 is provided on the upstream side and the second riser pipe part 26 is provided on the upstream side, and the water is stopped by the water stopcock 6 in the first riser pipe part 25 on the downstream side, the culvert pipe 3 is introduced into the second riser pipe portion 26 on the upstream side, and the introduced water into the second riser pipe portion 26 passes through the drainage pipe 9 to the water stoppage in the drainage pipe 24. It is comprised so that it may drain in the drainage direction downstream rather than the stopper 6, It concerns on the water tank with a groundwater level adjustment function for agricultural fields of Claim 1 characterized by the above-mentioned.

  Further, a water tank with a groundwater level control for a field which is embedded in the underground of the field 1 and is provided for the underdrain pipe 3 for draining the soil water of the field 1 to the drainage channel 2, and a drainage portion communicating with the underdrain pipe 3 The rising pipe portion 5 is erected on the branch pipe 4 provided with 4A so that the upper opening 5A of the rising pipe portion 5 is exposed to the ground surface, and the drainage pipe is discharged from the underdrain pipe 3 into the rising pipe portion 5. A stop cock 6 that closes and prevents drainage to the portion 4A is provided so as to be openable and closable. The stopcock 6 is provided with a first operation section 7 that can be opened and closed. The operation part 7 is provided so that it can be opened and closed at the upper opening 5A of the riser pipe part 5, and when water is stopped by the water stop cock 6, the running water from the underdrain pipe 3 is passed through the riser pipe part 5. A water stop introduction pipe 8 to be introduced into the water supply pipe 8 is provided, and the flowing water introduced into the rising pipe section 5 is drained into the drainage pipe 2 through the water stop introduction pipe 8. And a water level adjusting pipe 10 that can be adjusted in the vertical direction within the rising pipe portion 5. The water level adjusting pipe 10 is also provided with a water stoppage 9. The second operation unit is configured to insert and arrange the first operation unit 7 of the stopper 6 and adjust the position of the upper end of the water level adjustment tube 10 by extending and contracting the water level adjustment tube 10 to the water level adjustment tube 10. 11 and the second operation part 11 is provided so as to be operated at the upper opening 5A of the riser pipe part 5. From the upper end part of the water level adjustment pipe 10 which is expanded and contracted by the second operation part 11 With the function of adjusting the groundwater level for the field, the groundwater level of the soil water in the field 1 can be adjusted and set by draining the overflow water from the drainage pipe 9 to the drainage path 2 It is related to Minamata.

  In addition, the first operation portion 7 is projected upward from the upper portion of the stop cock 6, and the first operation portion 7 is formed to have a smaller diameter than the water level adjusting pipe 10. 7 is inserted into the water level adjusting pipe 10 and the length of the first operating section 7 is set so that the upper end of the first operating section 7 is located near the upper opening 5A of the rising pipe section 5. And at least the upper end portion of the first operation portion 7 can be opened and closed by the upper opening portion 5A of the rising tube portion 5 and is directed upward to the upper peripheral edge portion of the water level adjusting tube 10. The second operation portion 11 is projected, and the length of the second operation portion 11 is adjusted so that the upper end portion of the second operation portion 11 is located in the vicinity of the upper opening 5A of the riser tube portion 5. It is set and configured such that at least the upper end portion of the second operation portion 11 can be expanded and contracted by the upper opening portion 5A of the riser tube portion 5. That claim 3 relates to a field for groundwater level-adjustable water 閘 according.

  In addition, a water level measurement pipe portion 12 communicating with the inside of the water stop introduction pipe 8 is provided in an upright state in the water stop introduction pipe 8, and an upper opening 12A of the water level measurement pipe 12 is formed on the ground surface. In this water level measuring pipe section 12, a long measuring body 14 having a float 13 is accommodated in the water level measuring pipe section 12, and drainage from the underdrain pipe 3 to the drainage section 4A is performed by the stop cock 6. When the water is stopped and the water is introduced into the water level measuring pipe part 12 through the introduction pipe 8 when the water stops, the long measuring body 14 protrudes from the upper opening 12A of the water level measuring pipe part 12 through the float 13. It is comprised so that the groundwater level of the said field 1 can be measured by measuring the length of this protruding long measuring body 14, The field use of any one of Claims 3 and 4 characterized by the above-mentioned. It relates to a water tank with a function of adjusting the groundwater level.

  Moreover, the scale 14A which displays the water level of the said agricultural field 1 in the said long measuring body 14 was formed, It concerns on the water tank with a ground water level adjustment for agricultural fields of Claim 5 characterized by the above-mentioned.

  Further, the water level measuring pipe section 12 is provided with a water supply pipe 15 that leads to a location on the drainage path 2 side in the field 1, and the culvert pipe 3 is stopped by the stop cock 6 and the water level is adjusted. By positioning the upper end of the pipe 10 above the water supply line 15, the drainage path in the field 1 from the water supply line 15 via the water stop introduction pipe 8 and the water level measurement pipe part 12. It is comprised so that water can be supplied to the 2nd field surface, It concerns on the water tank with a groundwater level adjustment for agricultural fields of any one of Claim 5, 6.

  In addition, a soft water stop ring that is in pressure contact with the lower inner surface of the first riser pipe portion 25 or the lower inner surface of the riser pipe portion 5 when water is stopped by the stop cock 6 is provided above the stop cock 6. The band 36 is provided around the water tank according to any one of claims 1 to 7, wherein the ground water level is adjusted.

  As described above, the present invention unifies the first riser pipe part having a water tank function and the water introduction path and the drainage path of the second riser pipe part having a water level adjustment function. In addition to reducing the amount of piping required to install this equipment, the installation workability will be improved because the ground digging and backfilling work need only be done for one pipe. The installation cost is reduced, and the first riser pipe and the second riser pipe are installed in close proximity to each other. It is easy to carry out in a short time, and it is an epoch-making water tank with a groundwater level adjustment function for fields that is extremely practical, such as excellent operability.

  Further, in the invention according to claim 2, it is a water tank with a function of adjusting the groundwater level for a field, having a more excellent configuration that makes it possible to easily design and realize a configuration that reliably exhibits the functions and effects.

  Moreover, since it comprised as mentioned above in invention of Claim 3, it does not perform the opening / closing operation of a stop cock and the level adjustment of a water level adjustment pipe in a separate place like the conventional water level adjustment apparatus for fields. Because the water faucet can be operated at the upper opening of the riser pipe that is exposed only at one location on the surface of the earth (operation of the first operation section) and the water level adjustment pipe (operation of the second operation section). There is no need to change the direction of the body or move one by one, it is possible to perform the opening and closing operation of the water faucet and the expansion and contraction operation of the water level adjustment pipe in a series of operations, etc. In addition, the present invention has a configuration in which two members (a stop cock and a water level adjustment pipe) and two operation parts (a first operation part and a second operation part) are accommodated in one vertical pipe (a rising pipe part). However, a water level adjustment pipe is provided in the riser pipe, and the first operation part of the stop cock is inserted into the water level adjustment pipe. Due to the arrangement, the riser pipe section may have a width that can accommodate the water level adjustment pipe equivalent to the vertical cylinder of the conventional device. As a result, the system can be made more compact than conventional devices, and the water stop function and the water level adjustment function are combined into a single vertical pipe. Compared to conventional equipment, the amount of piping required to install this equipment has been reduced, and the scope of digging and backfilling of the ground during installation is limited to that of one pipe. Therefore, it is possible to construct a product that improves the workability by reducing the labor required for the installation work, and it is a groundwater level adjustment pad for a field with an extremely excellent practicality.

  In the invention according to claim 4, a water level adjusting pipe is provided in the rising pipe portion, and the first operation portion of the stop cock is inserted and disposed in the water level adjusting pipe, thereby simplifying the configuration of the apparatus. It becomes a water tank with a groundwater level adjustment function for a field with a structure that is more practical and can be realized.

  Further, in the invention according to claim 5, since it is possible to adjust the amount of water in the field by expanding and contracting the water level adjustment pipe while observing the measured value of the groundwater level in the field indicated by the long measuring body, The water level in the field can be finely adjusted, and the water tank with the groundwater level adjustment function for the field can be easily adjusted to the optimum water level according to need and has an extremely practical configuration.

  In the invention according to claim 6, the water tank with a function of adjusting the groundwater level for a field is provided, which has a more excellent practicality in which an actual measured value of the groundwater level in the field can be easily confirmed.

  Further, in the invention according to claim 7, when supplying water to the surface of the field in the field, water can be supplied from the water supply line to the drainage side in the field which is easy to dry, simultaneously with water supply from the normal water supply port. This is a water tank with a function of adjusting the groundwater level for the field, which is very useful when it is necessary to quickly water the surface of the field in the field.

  Further, in the invention according to claim 8, the water tank with a groundwater level adjusting function for a field having a more excellent practicality in which the water stop state by the water stop cock becomes extremely good and the above-mentioned action and effect are surely exhibited. Become. In particular, when the water is stopped by the water stop cock as in the third aspect of the invention, in the case of the structure in which the running water from the underdrain pipe is introduced into the riser pipe portion equipped with the water level control pipe, the water leaks from the water stop cock. If water flows into the drainage section, the water level adjustment function will not work well, and the maintenance of the groundwater level will be insufficient, but the water level adjustment function is ensured by improving the water stoppage as in this invention. It will be extremely useful.

  Embodiments of the present invention that are considered suitable (how to carry out the invention) will be briefly described with reference to the drawings, illustrating the operation of the present invention.

  The case of the invention described in claim 1 will be described.

  If the stop cock 6 is opened, soil water in the field 1 is drained to the drainage channel 2 through the underdrain pipe 3 and the drainage pipe 24. Therefore, the groundwater level in the field 1 is lowered and the paddy field is converted to dry rice. Can be encouraged.

  In order to adjust the water level in the field 1 (the water level on the rice field and the groundwater level), for example, first, the first operation part 7 is operated at the upper opening exposed on the ground surface of the first riser pipe part 25, and the stop is stopped. The drainage from the culvert pipe 3 to the drain pipe 24 is blocked (stopped) by the faucet 6.

  Then, the flowing water from the culvert pipe 3 is introduced into the second riser pipe portion 26, rises in the water level adjustment pipe 10, and overflows from the upper end of the water level adjustment pipe 10. The water is drained to the drain side 4 </ b> A from the stop cock 6 and drained to the drainage channel 2.

  Next, when the second operation portion 11 is operated at the upper opening of the second riser pipe portion 26 and the position of the upper end of the water level adjustment pipe 10 is moved in the vertical direction, the water level in the field 1 is changed to the water level adjustment pipe 10. Therefore, the water level in the field 1 can be adjusted to an arbitrary water level by operating the second operation unit 11.

  At this time, since the first riser pipe part 25 and the second riser pipe part 26 are erected in close proximity to each other, the first operation part 7 and the second operation part 11 are also close to each other, and therefore are stopped. The opening / closing operation of the faucet 6 and the expansion / contraction operation of the water level adjusting pipe 10 can be easily performed in a series of operations, and the operability is excellent.

  In addition, the conventional water level control device for a farm is provided with a pipe part having a water tank function by branching a culvert pipe and a pipe part having a water level control function provided at different positions, and the drain pipes are also provided separately. In the present invention, the drain pipe 24 communicating with the underdrain pipe 3 is connected to the first rise pipe section 25 having a water tank function and the second rise pipe section having a water level adjusting function. 26 and the drainage pipe 24 that drains the water introduced into the second riser pipe section 26 (in the water level control pipe section 10) when the water stops. 9 is connected to the drainage pipe 24 downstream from the stop cock 6 without being connected directly to the drainage channel 2, and the drainage path of this device is integrated into the drainage pipe 24. The amount of piping used to install the equipment will be reduced, and in addition, the range of ground digging and backfilling work during installation will be Since only one tube is enough, installation workability is improved and installation costs are reduced.

  The case of the invention described in claim 3 will be described.

  If the stop cock 6 is opened, the soil water in the field 1 is drained to the drainage channel 2 through the drainage part 4A of the underdrain pipe 3 and the branch pipe 4, so that the groundwater level of the field 1 is lowered. , Can promote dry rice.

  When adjusting the groundwater level in the field 1, for example, first, the first operation unit 7 is operated with the upper opening 5 </ b> A exposed to the ground surface of the riser pipe unit 5, and the stopcock 6 is used to The drainage to the drainage part 4A is blocked (stopped).

  Then, the flowing water from the culvert pipe 3 is introduced into the rising pipe section 5 through the introduction pipe line 8 at the time of water stoppage, and when it rises in the water level control pipe 10 and overflows from the upper end of the water level control pipe 10, The water is drained to the drainage channel 2 through the pipe 9.

  Next, when the second operating portion 11 is operated at the upper opening 5A of the rising pipe portion 5 to move the position of the upper end of the water level adjusting pipe 10 in the vertical direction, the water level in the field 1 is adjusted to the level of the water level adjusting pipe 10. Since it follows the level of the upper end, the water level in the field 1 can be adjusted to an arbitrary water level by the operation of the second operation unit 11.

  Therefore, according to the present invention, the rising pipe portion 5 that is exposed to only one place on the ground surface without performing the opening / closing operation of the water faucet and the level adjustment of the water level adjustment pipe at different places as in the conventional apparatus. The operation of the stop cock 6 (first operation part 7) and the operation of the water level adjustment pipe 10 (second operation part 11) can be performed at the upper opening 5A of the water without changing or moving the body one by one. The opening / closing operation of the stop cock 6 and the expansion / contraction operation of the water level adjusting pipe 10 can be performed in a series of operations, and the operability is extremely excellent.

  Further, the present invention includes two members (a stop cock 6 and a water level adjusting pipe 10) and two operation parts (a first operation part 7 and a second operation part 11) in one pipe (the rising pipe part 5). However, the two members and the two operation portions are arranged side by side so that the rising pipe portion 5 does not require a horizontal width, and the water level is set in the rising pipe portion 5. Since the adjustment pipe 10 is provided, and the first operation portion 7 of the water stop cock 6 is inserted and disposed in the water level adjustment pipe 10, the riser pipe portion 5 has the same water level adjustment as that of the vertical cylinder of the conventional device. Since it is sufficient to have a width that can accommodate the tube 10, the apparatus does not increase in size, and therefore a configuration in which the water tank function and the water level adjustment function are integrated in the space of one vertical pipe can be realized. This makes it possible to achieve a more compact size than conventional devices.

  Further, the conventional water level adjusting device for a farm has provided a pipe part having a water tank function by branching a culvert pipe and a pipe part having a water level adjusting function provided at different positions in the present invention. The standing pipe section 5 is erected on the branch pipe 4 provided with the drainage section 4A communicating with the underdrain pipe 3, and a water stop function (water tank) function and a water level adjustment function are provided in the single rising pipe section 5. Therefore, it is possible to unify the water guide path to the riser pipe section 5 having each of these functions, thereby reducing the amount of piping required for installing this apparatus. Since the ground digging and backfilling work needs to be at least as long as one pipe at least for the water conduit, the installation workability is improved and the installation cost is reduced.

  Further, for example, a water level measurement pipe portion 12 communicating with the inside of the water stop introduction pipe line 8 is provided in an upright state in the water stop introduction pipe line 8 and an upper opening 12A of the water level measurement pipe portion 12 is provided. Is exposed to the ground surface, and a long measuring body 14 having a float 13 at the bottom is accommodated in the water level measuring pipe section 12, and the water faucet 6 connects the underdrain pipe 3 to the drainage section 4A. When the drainage is stopped and the water is introduced into the water level measurement pipe part 12 through the introduction pipe 8 at the time of water stoppage, the long measurement body 14 is inserted from the upper opening 12A of the water level measurement pipe part 12 through the float 13. By projecting and measuring the length of the projecting long measuring body 14 so that the groundwater level of the field 1 can be measured, the actual measured value of the water level in the field 1 indicated by the long measuring body 14 can be seen. However, the amount of water in the field 1 can be adjusted by expanding and contracting the water level adjusting pipe 10, so that the finer The water level in the field 1 can be adjusted, and the adjustment to the optimum water level according to need can be easily performed.

  By the way, the normal farm 1 is provided with a drainage outlet on the drainage channel 2 side and a water supply outlet on the opposite side of the drainage channel 2 side, and drains water on the rice field in the farmland 1 from this drainage port. In addition, it is possible to supply water directly from the water supply port to the field 1 Uchida. However, when draining from this drainage port, there is a field where only the surface on the drainage channel 2 side of the field 1 is likely to dry quickly, and then water is supplied from the water supply port on the surface of the field 1 to fill the water. However, because of the size of the farm field 1, there is a problem that water often does not spread from the vicinity of the water supply port to the dry drainage channel 2 side.

  In this regard, for example, the water level measurement pipe section 12 is provided with a water supply pipe 15 leading to the location on the drainage path 2 side in the field 1, and the culvert pipe 3 is stopped by the stop cock 6, By positioning the upper end of the water level adjusting pipe 10 above the water supply pipe 15, the water level adjustment pipe 10 is connected to the water supply line 15 through the water stop introduction pipe 8 and the water level measurement pipe section 12. If water is supplied to the surface of the drainage channel 2 side of the water, water supply from the water supply line 15 to the surface of the drainage channel 2 side in the field 1 that is easy to dry is performed simultaneously with water supply from the normal water supply port. Therefore, it is very useful when it is desired to spread water on the rice field in the field 1 as uniformly as possible in a short time.

  A specific embodiment 1 of the present invention will be described with reference to FIGS.

  In the present embodiment, as shown in FIG. 1, the underdrain pipe 3 embedded in the basement of the farm field 1 communicates with the underdrain pipe 3 on the downstream end side existing in the ground of the underdrain 1 A along the drainage channel 2. The drainage pipe 24 to be connected is connected, and the first riser pipe part 25 and the second riser pipe part 26 are erected in a state of being juxtaposed in parallel with the connection pipe 24, and the first riser pipe part 25 The upper openings 25A and 26A of the second riser pipe portion 26 are exposed to the ground surface. In addition, the description “embedded in the basement of the farm field” described in claim 1 is that the underdrain of the underdrain of the paddy field 1A around the paddy field 1A is buried in the underground field of the paddy field 1A. It is used in the meaning including. Reference numeral 22 in the figure denotes a pipeline for supplying irrigation water.

  Specifically, one end of a straight drainage pipe 24 is connected to the downstream end of the underdrain pipe 3, and a discharge pipe 33 leading to the drainage channel 2 is connected to the other end of the drainage pipe 24. Yes.

  In addition, as shown in FIGS. 2 and 3, the drain pipe 24 is provided with three vertical pipes at intervals, of which two pipes existing upstream of the drain pipe 24 in the drain direction. The vertical pipes are provided so that their upper ends protrude slightly from the ground surface of the eaves 1A, and the two vertical pipes 26, 26 The riser pipe section 25 is used. The first riser pipe portion 25, the second riser pipe portion 26, and the vertical pipe 29 erected on the most downstream side may be integrally formed with the drainage pipe 24, or another pipe material may be used as the drainage pipe. You may provide by connecting to 24.

  Further, a lid 31 is attached to the upper opening 25A of the first riser pipe part 25 so as to be opened and closed, and the lid 32 can also be opened and closed to the upper opening 26A of the second riser pipe part 26. Wearing.

  In the present embodiment, a stop cock 6 that closes the drain pipe 24 to prevent drainage is provided in the first riser pipe section 25 so as to be openable and closable, and the stop cock 6 is attached to the stop cock 6. A first operating part 7 that can be opened and closed is provided, and the first operating part 7 is provided so that it can be opened and closed at the upper opening 25A of the first riser pipe part 25.

  Specifically, the stop cock 6 is provided so as to be movable up and down at the lower part in the first riser pipe portion 25, and the drain pipe 24 is closed at the lowest movement position of the stop cock 6 so that the underdrain pipe 3 is closed. The drainage pipe 24 is blocked in the middle (intermediate part) of the drainage pipe 24 (see FIG. 3), and the horizontal pipe part 40 is opened to the drainage channel 2 by moving the stop cock 6 upward. It is set as the structure which can drain (refer FIG. 2).

  The stop cock 6 is a rubber plug having a cylindrical shape having an outer diameter substantially the same as the inner diameter of the continuous vertical pipe portion of the drain pipe 24 and the first riser pipe portion 25, and the lower end portion formed into a hemispherical shape. In addition, the hemispherical lower end portion of the water stop cock 6 is in close contact with the bottom surface of the drain pipe 24, and the drain pipe 24 is stopped by having the upper peripheral surface in close contact with the inner surface of the continuous vertical pipe section. Yes.

  Further, the lower inner surface of the first riser pipe part 25 (the drainage in which the lower part of the first riser pipe part 25 is fitted in the drawing) when the water faucet 6 is stopped. A soft (rubber) water stop ring 36 is provided around the inner surface of the short vertical pipe portion standing from the pipe 24. In addition, the description of “pressure contact with the lower inner surface of the first rising pipe portion 25” in claim 8 is not limited to the structure in which the water stop ring 36 is directly pressed against the lower inner surface of the first rising pipe portion 25. It is used in the meaning including a configuration in which the waterstop ring 36 is indirectly pressed against the lower inner surface of the first rising pipe portion 25 as in the embodiment.

  In more detail, as shown in FIG. 4, the water stop ring 36 is provided around the entire circumference of the small-diameter portion of the top of the water stop cock 6 in a double-upper manner. The pressure contact surface portion 37 is also formed on the lower inner surface of the first riser pipe portion 25 (lower tube half body 250) that is in pressure contact, that is, in the present embodiment, the inner surface of the short vertical pipe portion erected from the drainage pipe 24. In addition, the water stop ring 36 and the pressure contact surface portion 37 improve water stop and prevent water leakage.

  In addition, the structure for attaching the water stop ring 36 to the water stop cock 6 is such that an annular spacer 38 is fitted on the small diameter portion of the upper part of the water stop cock 6, and the ring band is made superposed on the spacer 38. A plate-shaped water-stop ring band 36 is fitted, and another spacer 38 is fitted on the upper part of the water-stop ring band 36 in a polymerized state. The mounting structure is such that a water stop ring 36 is fitted and a fixing cap 39 is fitted and fixed to the upper part of the upper water stop ring 36. The mounting structure of the water stop ring 36 can be easily designed and realized.

  In addition, the first operation portion 7 is projected from the upper portion of the water stop cock 6.

  More specifically, the first operation portion 7 is configured by projecting an operation rod 7A upward from the top of the water stop cock 6 and forming a handle 7B on the upper end portion of the operation rod 7A.

  Further, the length of the operating rod 7A is set so that the handle 7B at the upper end is positioned in the vicinity of the upper opening 25A of the first rising pipe portion 25, and the handle 7B Is configured to move up and down in the vicinity of the upper opening 25A of the first riser pipe section 25 from which the lid 31 has been removed, so that the water stop cock 6 can be easily opened and closed.

  Further, a guide body 21 is provided near the upper portion of the first riser pipe portion 25, and the operation rod 7A is inserted into a guide hole formed at the center position of the guide body 21 so that the operation rod 7A is raised. The operation rod 7 </ b> A is smoothly moved up and down by the guide hole.

  Further, in this embodiment, when water is stopped by the water stop cock 6, the flowing water from the culvert pipe 3 is introduced into the second riser pipe part 26, and this second riser pipe part A drain pipe 9 is provided for draining the flowing water introduced into the drain 26 to the drain downstream side of the stop cock 6 of the drain pipe 24.

  Specifically, the bellows tube 28 is projected from the downstream side surface of the second rising tube portion 26 toward the downstream side.

  On the other hand, the vertical pipe 29 erected on the most downstream side of the drain pipe 24 is set to have a low height and its upper end portion is bent toward the upstream side.

  Then, as shown in FIG. 5, the bellows tube 28 is curved to bypass the side of the first riser tube portion 25, and the projecting tip portion of the bellows tube 28 toward the downstream side is the downstream vertical tube. 29 is connected to the bent tip portion of the pipe 29, and the drainage pipe 24 communicates with the downstream side of the drainage pipe 24 through the bellows pipe 28 and the vertical pipe 29 and the drainage pipe 24 communicates with the downstream side of the drainage pipe 24. A path is formed, and this drain line 9 is used as the drain line 9. If the configuration in which the drain pipe 9 bypasses the first rising pipe portion 25 in this way is adopted, the apparatus can be saved in space. In addition, by adopting a configuration using the bellows tube 28 as the detour structure, the structure can be easily designed and realized.

  Further, in this embodiment, a water level adjusting pipe 10 that is adjustable in the vertical direction in the second rising pipe section 26 is provided in the second rising pipe section 26, and the water level adjusting pipe 10 is provided with this water level adjusting pipe 10. A second operating portion 11 is provided that can adjust the position of the upper end of the water level adjusting pipe 10 by extending and contracting the water level adjusting pipe 10, and the second operating portion 11 is an upper opening 26A of the second rising pipe portion 26. So that it can be expanded and contracted.

  Specifically, the lower edge of the water level adjusting pipe 10 is attached and fixed near the lower portion of the second rising pipe portion 26.

  Further, the water level adjusting pipe 10 is smaller in diameter than the pipe diameter of the second rising pipe 26 and has a gap that allows water to flow between the inner surface of the second rising pipe 26 and the outer surface of the water level adjusting pipe 10. A bellows tube 10 having a diameter is generated.

  Further, the lower peripheral edge of the water level adjusting pipe 10 is fixed to the inner peripheral surface of the second riser pipe part 26 (lower pipe half 260 to be described later) in a watertight state, and the second riser pipe is fixed at the time of the water stoppage. The water introduced into the part 26 does not rise as it is along the inner surface of the second riser pipe part 26 but is accommodated in the water level adjustment pipe 10 and flows upward. This water flows from the upper end of the water level adjustment pipe 10. When it overflows, it is configured to flow into the gap between the inner surface of the second rising pipe 26 and the outer surface of the water level adjusting pipe 10 and fall (see the arrow in FIG. 3).

  The second operating portion 11 has an operating rod 11A formed of a screw rod at a center position of the second riser pipe portion 26 and supports the operating rod 11A in a vertically installed state so as to be rotatable. A handle 11B is attached to the upper end of the operating rod 11A. It is configured to be detachable. Further, the operation rod 11A is supported in an upright state by being pivotally supported by bearings 30 provided at the upper and lower end portions of the second rising cylinder portion 26.

  On the other hand, when a screw hole 10A is provided at the center position of the upper end of the water level adjusting pipe 10, the operation rod 11A is screwed into the screw hole 10A, and the operation rod 11A is rotated by the handle 11B. The upper end portion of the water level adjusting pipe 10 is screwed up and down through the screw hole 10A so that the expansion and contraction is adjusted.

  Further, the second operating portion 11 sets the length of the operating rod 11A so that the upper end handle 11B is positioned near the upper opening 26A of the second riser tube portion 26, and the handle 11B. Is rotated near the upper opening 26A of the second riser pipe portion 26 so that the water level adjustment pipe 10 can be expanded and contracted (the height of the upper end of the water level adjustment pipe 10 is raised and lowered). .

  That is, as the second operation portion 11, the configuration in which the upper end portion of the water level adjusting pipe 10 is screwed up and down by a turning operation is adopted, so that the second rising pipe portion of the operating rod 11 </ b> A can be obtained even if the water level adjusting pipe 10 is extended to a high degree. Since the height in 26 does not fluctuate, the handle 11B can be removed and the lid 32 can be closed after the expansion / contraction operation of the water level adjustment pipe 10, and the components in the upper opening 26A are protected from the ultraviolet rays of sunlight. Thus, deterioration can be prevented.

  In addition, a measure 27 for measuring the height of the upper end of the expanding and contracting water level adjusting pipe 10 is attached to the upper peripheral edge of the water level adjusting pipe 10 and accommodated in the second riser pipe part 26. By using the measure 27, the adjustment state of the water level adjustment pipe 10 (height position of the upper end of the water level adjustment pipe 10, that is, the set water level in the field 1) can be confirmed.

  Further, the drain pipe 9 is configured to branch from the side surface of the second rising pipe portion 26 slightly above the lower end portion of the water level adjusting pipe 10, and when the overflow from the upper end of the water level adjusting pipe 10 falls, It is configured to flow into the conduit 9 and be discharged from the downstream side of the drainage pipe 24 to the drainage path 2 (see arrow in FIG. 3).

  Accordingly, the water level adjusting pipe 10 is vertically expanded and contracted to change the height of the overflow from the upper end of the water level adjusting pipe 10 so that the groundwater level in the field 1 can be adjusted. . In other words, the soil water level in the field is normally adjusted by rainwater or spring water, and the groundwater level is the same even when water is taken from the irrigation water pipeline 22 and is actively supplied to the soil by underground irrigation. It can be adjusted and set.

  The water level adjustment pipe 10 may be configured by using a pipe other than the bellows pipe. However, when the bellows pipe is used, the expansion / contraction adjustment range is wide, and even if there is no positioning presser, the water level adjustment pipe 10 is self-supporting after adjustment. There is an advantage that the structure of the apparatus can be simplified by using the bellows tube that can maintain the positioning state.

  In the present embodiment, the first riser pipe part 25 and the second riser pipe part 26 are provided with the expansion / contraction adjustment mechanism 20, and the expansion / contraction adjustment mechanism 20 allows the upper opening 25A of the first riser pipe part 25 to Adjust the position of the upper opening 26A of the second riser pipe portion 26 to the height of the eaves 1A or the like on which this apparatus is installed (between the underdrain pipe 3 installed in the ground and the upper surface of the eaves 1A etc. By adjusting the expansion and contraction (according to the distance), the workability is improved by reducing the work by cutting and bonding the pipes at the time of height adjustment.

  Specifically, the first riser pipe portion 25 and the second riser pipe portion 26 are both lower pipe halves 250 and 260 and larger in diameter than the lower pipe halves 250 and 260. It consists of upper pipe halves 251 and 261 that are slidably fitted on the outer peripheries of the pipe halves 250 and 260. The expansion / contraction adjustment mechanism 20 that can adjust the height of the first rising pipe portion 25 and the second rising pipe portion 26 is configured.

  A second embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, as shown in FIG. 6, the underdrain pipe 3 embedded in the basement of the farm field 1 communicates with the underdrain pipe 3 on the downstream end side existing in the ground of the overhang 1 </ b> A along the drainage channel 2. The branch pipe 4 provided with the drainage section 4A is connected, and the rising pipe section 5 is erected on the branch pipe 4 so that the upper opening 5A of the rising pipe section 5 is exposed to the ground surface. Reference numeral 22 in the figure denotes a pipeline for supplying irrigation water.

  Specifically, one end portion of the horizontal tube portion 40 of the substantially inverted T-shaped branch tube 4 is connected to the downstream end portion of the underdrain tube 3, and the horizontal tube portion 40 communicating with the underdrain tube 3 is connected to the drainage portion 4A. And a discharge pipe 33 communicating with the drainage channel 2 is connected to the other end of the horizontal pipe section 40.

  A vertical pipe portion of the branch pipe 4 is provided so that its upper end portion slightly protrudes from the ground surface of the ridge 1A, and this vertical pipe portion is used as a rising pipe portion 5. The rising pipe portion 5 may be integrally formed with the branch pipe 4 or may be provided by connecting a separate pipe member to the branch pipe 4.

  A lid 16 is attached to the upper opening 5A of the rising pipe portion 5 so as to be freely opened and closed.

  In this embodiment, a stop cock 6 is provided in the riser pipe section 5 so as to be able to open and close to prevent the drainage from the underdrain pipe 3 to the drain section 4A. A first operating portion 7 that can open and close the faucet 6 is provided, and the first operating portion 7 is provided so that it can be opened and closed at the upper opening 5A of the rising pipe portion 5.

  Specifically, the stop cock 6 is provided in the upright pipe portion 5 so as to be movable up and down, and the horizontal pipe portion 40 is closed at the lowest movement position of the stop cock 6 to discharge the drainage from the underdrain pipe 3. A configuration that prevents drainage to the portion 4A (see FIGS. 9 and 10), and a configuration that allows the drainage by opening the horizontal pipe portion 40 by moving the stop cock 6 upward (see FIG. 12). It is said.

  The stop cock 6 employs the same configuration as that of the first embodiment, and the upper portion of the stop cock 6 has the above-mentioned standing at the time of water stoppage by the stop cock 6 as in the first embodiment. A soft (rubber) water stop ring that presses against the lower inner surface of the upper pipe portion 5 (in the drawing, the inner surface of a short vertical pipe portion erected from the drainage portion 4A on which the lower portion of the rising pipe portion 5 is fitted) A belt 36 is provided around.

  On the other hand, for example, the soft (rubber) pressure contact surface portion 37 that the water stop ring 36 is in pressure contact with the lower inner surface of the rising tube portion 5 (lower tube half 50), that is, in the present embodiment, Attached to the inner surface of the short vertical pipe portion standing from the drainage portion 4A, the waterstop is improved by the waterstop ring zone 36 and the pressure contact surface portion 37. The water stop structure by the water stop ring 36 and the pressure contact surface portion 37 is basically the same as that of the first embodiment. In the description of the first embodiment, the first rise pipe portion 25 is replaced with the rise pipe portion. The drainage pipe 24 should be replaced with the drainage section 4A.

  Further, the description of “pressure contact with the lower inner surface of the rising pipe portion 5” in claim 8 is not limited to the structure in which the waterstop ring 36 is directly pressed against the lower inner surface of the rising pipe portion 5, but also in this embodiment. In addition, it is used in the meaning including a configuration in which the waterstop ring 36 is indirectly in pressure contact with the lower inner surface of the rising pipe portion 5.

  In addition, the first operation portion 7 is projected from the upper portion of the water stop cock 6.

  More specifically, the first operation portion 7 is configured by projecting an operation rod 7A upward from the top of the water stop cock 6 and forming a handle 7B on the upper end portion of the operation rod 7A.

  Further, the first operating portion 7 sets the length of the operating rod 7A so that the upper end handle 7B is positioned in the vicinity of the upper opening 5A of the riser tube portion 5, and stands the handle 7B. It is configured such that the stop cock 6 can be easily opened and closed by moving up and down in the vicinity of the upper opening 5A of the upper pipe portion 5.

  In addition, a guide body 21 is provided near the upper portion of the rising pipe portion 5, and the operation rod 7A is maintained in an upright state by inserting the operation rod 7A through a guide hole formed at the center position of the guide body 21. In addition, the guide rod is configured to smoothly move the operating rod 7A up and down.

  Further, in this embodiment, when water is stopped by the water stop cock 6, a water stop introduction pipe line 8 is provided for introducing the running water from the underdrain pipe 3 into the riser pipe portion 5. A drainage pipe 9 is provided for draining running water introduced into the rising pipe section 5 through the introduction pipe 8 to the drainage path 2.

  Specifically, as shown in FIG. 7, after the branch pipe portion is erected from the upper side surface on the upstream side of the horizontal pipe portion 40 of the branch pipe 4, the branch pipe portion is once extended upward. The branch pipe is bent in the horizontal direction on the downstream side of the underdrain pipe 3 and is connected to a position on the lower side surface of the rising pipe portion 5 and above the water stop cock 6 in the water stop state. A pipe line is formed through which the upstream side of the horizontal pipe part 40 (underdrain pipe 3) and the rising pipe part 5 communicate with each other, and the pipe line formed by this branch pipe part is used as the water stop introduction pipe line 8. . Note that the water stop cock introduction pipe line 8 may be formed integrally with the branch pipe 4 or may be provided by connecting a pipe material of a separate part to the branch pipe 4.

  Moreover, it is a side surface of the rising pipe part opposite to the position where the introduction pipe line 8 at the time of water stop is connected to the rise pipe part 5 and is higher than the connection position of the introduction pipe line 8 at the time of water stop. The branch pipe part is horizontally projected from the position to the downstream side of the culvert pipe 3, and this branch pipe part is horizontally extended to the downstream side of the culvert pipe 3, and then the upper side surface of the horizontal pipe part 40 on the downstream side of the culvert pipe Are connected to each other to form a pipe line through which the rising pipe part 5 communicates with the downstream side of the horizontal pipe part 40 (underdrain pipe 3) via the branch pipe part. Yes. The drain pipe 9 may be integrally formed with the branch pipe 4 or may be provided by connecting a separate pipe member to the branch pipe 4.

  In this embodiment, a water level adjusting pipe 10 that can be adjusted in the vertical direction in the rising pipe portion 5 is provided in the rising pipe portion 5, and the water stop cock is provided in the water level adjusting pipe 10. The first operation portion 7 is inserted and disposed, and the second operation portion 11 that can adjust the position of the upper end portion of the water level adjustment pipe 10 by expanding and contracting the water level adjustment pipe 10 to the water level adjustment pipe 10. The second operation portion 11 is provided so that it can be expanded and contracted at the upper opening 5A of the riser tube portion 5.

  Specifically, the lower edge of the water level adjusting pipe 10 is attached and fixed at a position slightly above the connection position of the water stopping introduction pipe line 8 to the rising pipe section 5.

  Further, the water level adjusting pipe 10 is smaller in diameter than the pipe diameter of the rising pipe 5 and has a diameter that creates a gap that allows water to flow between the inner surface of the rising pipe 5 and the outer surface of the water level adjusting pipe 10. A bellows tube 10 is employed, and the operation rod 7A of the water stop cock 6 is inserted into the bellows tube 10 so as to be movable up and down.

  Further, the lower peripheral edge of the water level adjusting pipe 10 is fixed in a watertight state with the inner peripheral surface of the rising pipe 5, and the water introduced into the rising pipe 5 through the introduction pipe 8 at the time of water stoppage. Does not rise as it is along the inner surface of the rising pipe portion 5 but is accommodated in the water level adjusting pipe 10 and flows upward. When this water overflows from the upper end of the water level adjusting pipe 10, the rising pipe 5 It is configured to flow into a gap between the inner surface and the outer surface of the water level adjusting pipe 10 and fall (see the arrow in FIG. 11).

  In addition, the second operation portion 11 is projected from the upper peripheral edge of the water level adjusting pipe 10.

  More specifically, the second operating portion 11 projects an operating rod 11A that employs a pipe rod upwardly toward the upper peripheral edge of the water level adjusting pipe 10, and a handle 11B is formed at the upper end of the operating rod 11A. Is configured.

  In addition, the second operating portion 11 has a length of the operating rod 11A so that the handle 11B at the upper end is positioned in the vicinity of the upper opening 5A of the rising pipe portion 5 with the water level adjusting pipe 10 being most contracted. Set the dimensions and move the handle 11B up and down near the upper opening 5A of the riser 5 to expand and contract the water level adjustment tube 10 (the height of the upper end of the water level adjustment tube 10 is raised and lowered) It is configured to be able to.

  The operating rod 11A displays a scale 17 indicating the height of the upper end of the expanding and contracting water level adjusting pipe 10, and the adjustment status of the water level adjusting pipe 10 (height position of the upper end of the water level adjusting pipe 10, That is, the set water level in the field 1 is made visible.

  Further, as shown in FIG. 8, the operating rod 11A is inserted into a guide hole 21A formed at an eccentric position of the guide body 21 to maintain an upright state, and the guide hole 21A allows the operating rod 11A to move up and down. The movement is performed smoothly.

  Further, the lower end of the operation rod 11A is detachably screwed to the upper peripheral edge of the water level adjusting pipe 10, and when the position of the upper end of the water level adjusting pipe 10 is set upward, The operation rod 11A can be removed from the water level adjusting pipe 10. Since the operation rod 11A is configured to be detachable as described above, the upper opening 5A of the rising pipe portion 5 can be closed with the lid 16 regardless of the adjustment position of the upper end portion of the water level adjustment pipe 10. This makes it possible to protect the components in the upper opening 5A from the ultraviolet rays of sunlight and prevent deterioration.

  In addition, a soft guide rod 34 for guiding the operating rod 11A to the screwed portion is provided at the screwed portion of the operating rod 11A above the water level adjusting tube 10, so that the water level adjusting tube 10 can be readjusted. At this time, when the pipe-shaped operating rod 11A is fitted on the guide rod 34 and lowered along the guide rod 34, the lower end portion of the operating rod 11A is guided to the screwed portion, and the operating rod 11A is screwed. The structure is such that it can be easily screwed to the attachment portion. The guide bar 34 is stored in the rising pipe portion 5 when the lid body 16 is closed (see FIG. 12).

  In addition, the drainage pipe 9 is configured to branch from the side of the rising pipe part 5 at a position slightly above the lower end part of the water level adjusting pipe 10, and when the overflow from the upper end of the water level adjusting pipe 10 falls, the drainage pipe line 9 9 and is discharged to the drainage channel 2 from the drainage part 4A.

  Accordingly, the water level adjusting pipe 10 is vertically expanded and contracted to change the height of the overflow from the upper end of the water level adjusting pipe 10 so that the groundwater level in the field 1 can be adjusted. . In other words, the soil water level in the field is normally adjusted by rainwater or spring water, and the groundwater level is the same even when water is taken from the irrigation water pipeline 22 and is actively supplied to the soil by underground irrigation. It can be adjusted and set.

  At this time, if the water leaks from the stop cock 6 and the water flows into the drainage part 4A, the water level adjustment function does not work well and the maintenance of the groundwater level becomes insufficient. In the embodiment, as described above, in addition to the water stop action by the water stop cock 6, the water stop is improved by the pressure stop water action of the water stop ring 36 and the pressure contact surface portion 37. As a configuration in which the water flowing into the part 5 (water level adjusting pipe 10) is surely prevented from leaking from the stop cock 6 to the drainage part 4A, and the water level adjusting function functions reliably. Yes.

  Further, in this embodiment, as shown in FIG. 7, a water level measuring pipe portion 12 communicating with the inside of the water stop introduction pipe 8 is provided in the standing state in the water stop introduction pipe 8. An upper opening 12A of the water level measuring pipe part 12 is exposed to the ground surface, and a long measuring body 14 having a float 13 at the lower part is accommodated in the water level measuring pipe part 12.

  Specifically, a tubular body is formed to extend further upward from the upper part of the bent portion of the introduction pipe line 8 at the time of water stoppage, and this extended tubular body is provided in parallel with the rising pipe portion 5. An installation pipe is used as the water level measurement pipe section 12, and an upper opening 12A of the water level measurement pipe section 12 is provided so as to slightly protrude from the flange 1A. The water level measurement pipe section 12 may be formed integrally with the water stop introduction pipe line 8 or may be provided by connecting a separate pipe member to the water stop introduction pipe line 8.

  The long measuring body 14 is constituted by a thin cylindrical body having a diameter smaller than that of the water level measuring pipe portion 12, and a scale 14A indicating the water level of the field 1 is displayed on the surface of the long measuring body 14.

  Further, the rod-shaped float 13 having a diameter smaller than that of the water level measuring pipe portion 12 is attached to the lower portion of the long measuring body 14, and the long measuring body 14 is placed inside the water level measuring pipe portion 12 with the float 13 facing down. It is stored in a vertical state.

  Accordingly, when the drainage from the underdrain pipe 3 to the drainage section 4A is stopped by the stop cock 6 and introduced into the water level measurement pipe section 12 through the introduction pipe 8 at the time of the stoppage, the float 13 is passed through. The long measurement body 14 protrudes from the upper opening 12A of the water level measurement pipe section 12, and the water level (actual value) of the field 1 can be measured by reading the scale 14A of the protruding long measurement body 14 (See FIGS. 9 to 12).

  Further, a lid 18 is attached to the upper opening 12A of the water level measuring pipe section 12 so that it can be freely opened and closed. When the long measuring body 14 is to measure the actual value of the water level in the field 1, this lid is used. Remove body 18.

  In this embodiment, the water level measurement pipe section 12 is provided with a water supply pipe 15 that leads to a location on the drainage path 2 side in the field 1.

  Specifically, in the drawing, a pipe is projected in a horizontal direction from a side surface at a height position within the expansion and contraction adjustment range of the water level adjustment pipe 10 and closer to the upper part of the water level measurement pipe section 12. A pipe body is provided so as to project to a location on the drainage channel 2 side of the field 1, and this pipe body is used as the water supply pipe line 15. This water supply pipe line 15 may be formed integrally with the water level measurement pipe part 12 or may be provided by connecting a separate pipe member to the water level measurement pipe part 12.

  Therefore, when the underdrain pipe 3 is stopped by the stop cock 6 and the upper end portion of the water level adjusting pipe 10 is positioned above the water supply pipe 15, the water stop introduction pipe 8 is interposed. When the water level in the water level measuring pipe section 12 rises and reaches the position of the water supply pipe 15, the water supply pipe 15 can supply water to the drainage pipe 2 side in the field 1 (FIGS. 10 and 10). 11).

  In addition, unlike the field 1 as shown in the figure, the height of the ridge 1A is low with respect to the rice field, and the water supply pipe 15 cannot be provided at the position 12 of the water level measurement pipe portion within the expansion / contraction adjustment range of the water level adjustment pipe 10. Even in this case, in the present embodiment, the water supply pipe 15 can be provided at a high position outside the expansion / contraction adjustment range of the water level adjustment pipe 10.

  That is, in this embodiment, when the water level adjusting pipe 10 is extended to a position where it is in close contact with the lower surface of the guide body 21, the upper peripheral edge of the water level adjusting pipe 10 is connected to the inner surface of the connecting ring portion 21B suspended from the lower surface of the guide body 21. The outer surface of the pipe is connected in a water-stopped state via the packing 35, so that the rising water introduced into the water level adjusting pipe 10 rises above the guide body 21 via the guide hole 21 </ b> A. The water level rises inward, and the water level in the water level measuring pipe section 12 also rises. Therefore, water can be supplied into the field 1 from the water supply pipe 15 protruding at a position higher than the height of the upper end of the water level adjusting pipe 10 having the maximum length.

  In addition, when the water supply pipe 15 is formed at a high position of the water level measurement pipe section 12 outside the expansion adjustment range of the water level adjustment pipe 10 as described above, if the cap 15A is mistakenly forgotten when water is supplied from the water supply pipe 15, Even if the water level continues to rise in the riser 5 and is closed by the lid 16, water may overflow from the upper opening 5 </ b> A and damage the bag 1 </ b> A.

  For this reason, in this embodiment, an overflow pipe 19 is protruded toward the drainage channel 2 on the side surface of the upper end of the water level measurement pipe section 12. The water is drained to the drainage channel 2 (see FIG. 12). The overflow pipe 19 may be formed integrally with the water level measurement pipe section 12 or may be provided by connecting a separate pipe member to the water level measurement pipe section 12.

  Further, in this embodiment, an expansion / contraction adjustment mechanism 20 is provided in the rising pipe section 5 and the water level measurement pipe section 12, and the expansion adjustment mechanism 20 allows the upper opening 5 </ b> A of the rising pipe section 5 and the water level measurement pipe section 12. The position of the upper opening 12A can be adjusted in accordance with the height of the fence 1A or the like where the apparatus is installed (according to the distance between the underdrain pipe 3 installed in the ground and the upper surface of the fence 1A or the like). In this height adjustment, the workability is improved by reducing work by cutting and bonding the pipe.

  Specifically, as shown in FIG. 13, the rising pipe portion 5 and the water level measuring pipe portion 12 are both larger in diameter than the lower pipe half 50/120 and the lower pipe half 50/120. It consists of upper pipe halves 51 and 121 that are slidably fitted on the outer peripheries of these lower pipe halves 50 and 120. By doing so, the expansion / contraction adjustment mechanism 20 is configured that enables the height adjustment of the riser pipe part 5 and the water level measurement pipe part 12 to be performed. Reference numeral 23 in the figure denotes a sealing packing.

  Note that the present invention is not limited to the first embodiment and the second embodiment, and the specific configuration of each component can be appropriately designed.

FIG. 3 is a schematic explanatory diagram illustrating a usage state of the first embodiment. It is an expansion explanation side sectional view showing the state where the water stop cock of Example 1 was opened. It is an expanded explanation side sectional view showing the state where the water stop cock of Example 1 was closed and the water level adjustment pipe was raised and the water level was raised. 2 is a partially enlarged explanatory view showing a water stop structure of Example 1. FIG. 3 is an explanatory plan view of Example 1. FIG. FIG. 6 is a schematic explanatory diagram illustrating a usage state of Example 2. 6 is an explanatory side sectional view showing Example 2. FIG. FIG. 10 is an explanatory perspective view illustrating a relationship between a first operation unit and a second operation unit according to the second embodiment. It is explanatory side sectional drawing which shows the state which obstruct | occluded the water stop cock of Example 2, and adjusted the water level. It is explanatory side sectional drawing which shows the state which raised the water level further from the state of FIG. 9, and was supplied to the drainage channel side in a farm field from a water supply pipe part. It is the elements on larger scale of FIG. It is explanatory side sectional drawing which shows the state from which the water level of Example 2 rises too much and drains from an overflow pipe. FIG. 6 is an explanatory side view showing an expansion / contraction adjustment mechanism of Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Farm 2 Drainage channel 3 Underdrain pipe 4 Branch pipe 4A Drainage part 5 Rising pipe part 5A Upper opening part 6 Stop cock 7 First operation part 8 Introducing pipe line 9 Drainage pipe line
10 Water level control pipe
11 Second operation section
12 Water level measuring tube
12A top opening
13 Float
14 Long measuring body
14A scale
15 Water supply pipeline
24 Drain pipe
25 First riser
25A top opening
26 Second riser
26A Top opening
36 Water stop ring

Claims (8)

  A water tank with a groundwater level adjustment function for a field that is buried under the field and drains the soil water in the field into the drainage channel, and is adjacent to the drain pipe that communicates with the light pipe The first riser pipe part and the second riser pipe part are erected and the upper openings of the first riser pipe part and the second riser pipe part are respectively exposed to the ground surface. A stop cock that closes the drain pipe to prevent drainage is provided in the riser pipe so as to be openable and closable. The stop cock is provided with a first operation section that can open and close the stop cock. One operation part is provided so that it can be opened and closed at the upper opening of the first riser pipe part, and when water is stopped by this stop cock, flowing water from the underdrain pipe is introduced into the second riser pipe part. The flowing water to be introduced into the second riser pipe is drained to the downstream side in the drainage direction from the stop cock in the drain pipe. A water pipe is provided, and a water level adjusting pipe that can be vertically adjusted in the second rising pipe is provided in the second rising pipe, and the water level adjusting pipe is expanded and contracted in the water level adjusting pipe. A second operation part that can adjust the position of the upper end of the water level adjustment pipe is provided, and the second operation part is provided so that it can be operated at the upper opening of the second riser pipe part. The overflow from the upper end of the water level adjustment pipe that has been stretched and contracted by the drainage is drained from the drainage pipe to the drainage path downstream from the stop cock in the drainage pipe to the drainage path. A water tank with a function of adjusting the groundwater level for agricultural fields, characterized in that the groundwater level of middle water can be adjusted and set.   The first riser pipe part and the second riser pipe part are erected in a juxtaposed state along the drainage direction of the drainage pipe, and the first riser pipe is disposed downstream of the drainage pipe in the drainage direction. If the second riser pipe part is provided on the upstream side and water is stopped by the stop cock in the first riser pipe part on the downstream side, the flowing water from the culvert pipe is upstream of the second riser pipe part. Introduced into the upper pipe part, the flowing water introduced into the second riser pipe part is configured to drain from the drainage pipe to the downstream side in the drainage direction from the stop cock in the drainage pipe. The water tank with a groundwater level adjustment function for agricultural fields according to claim 1.   A water tank with a groundwater level control for a farm that is buried underground in the field and that drains the soil water in the field into the drainage channel, and stands on a branch pipe that has a drainage unit that communicates with the conduit. An upper pipe is set up to expose the upper opening of this riser pipe to the ground surface, and a stop cock is opened and closed in this riser pipe to block and prevent drainage from the underdrain pipe to the drainage section. The faucet is provided with a first operation part that can be opened and closed, and the first operation part is provided so that it can be opened and closed at the upper opening of the riser pipe part. When the water is stopped by the water stop cock, a water stop introduction pipe is provided for introducing the running water from the culvert pipe into the rise pipe, and the rise pipe is provided via the water stop introduction pipe. A drainage pipe that drains the flowing water to be introduced into the drainage channel is provided, and this vertical pipe part is expanded and contracted vertically in the vertical pipe part. A water level control pipe that can be saved is provided, and the first operation portion of the stop cock is inserted and disposed in the water level control pipe, and the water level control pipe is expanded and contracted to the water level control pipe. The second operation part that can adjust the position of the upper end portion of the tube is provided, and the second operation part is provided so that it can be operated at the upper opening of the riser pipe part, and the expansion and contraction is adjusted by the second operation part. The groundwater for a field characterized in that the groundwater level of the soil water in the field can be adjusted and set by draining overflow water from the upper end of the water level control pipe from the drainage pipe to the drainage path. Water tank with position adjustment function.   The first operation part protrudes upward from the top of the stop cock, and the first operation part is formed to have a diameter smaller than that of the water level adjustment pipe, and the first operation part is inserted into the water level adjustment pipe. And the length of the first operating portion is set so that the upper end portion of the first operating portion is positioned near the upper opening of the riser tube portion, and at least the upper end of the first operating portion is set. And the second operation part is provided so as to project upward from the upper peripheral edge of the water level adjustment pipe, and the second operation part. The length dimension of the second operation portion is set so that the upper end portion of the second operation portion is positioned near the upper opening portion of the riser tube portion, and at least the upper end portion of the second operation portion is set to the upper opening portion of the riser tube portion. The water tank with a groundwater level adjusting function for a farm according to claim 3, wherein the expansion and contraction operation can be performed.   The water level measurement pipe part communicating with the inside of the water stop time introduction pipe line is provided in an upright state in the water stop time introduction pipe line, and the upper opening of the water level measurement pipe part is exposed to the ground surface. A long measuring body with a float at the bottom is accommodated in the pipe part, the drainage from the underdrain pipe to the drainage part is stopped by the stop cock, and the water level is passed through the introduction pipe at the time of stoppage. When water is introduced into the measuring pipe, a long measuring body protrudes from the upper opening of the water level measuring pipe through the float, and the length of the protruding long measuring body is measured to determine the groundwater level of the field. The water tank with a groundwater level adjusting function for agricultural fields according to any one of claims 3 and 4, wherein the water tank is configured to be able to measure.   The scale for displaying the water level of the field is formed on the long measuring body.   The water level measurement pipe part is provided with a water supply pipe that leads to a location on the drainage channel side in the field, and the culvert pipe is stopped by the stop cock, and the upper end of the water level adjustment pipe is connected to the water supply pipe It is configured so that water can be supplied from this water supply line to the surface on the drainage channel side in the field via the water stop introduction pipe and the water level measurement pipe part. The water tank with a groundwater level control for a farm according to any one of claims 5 and 6. A soft water stop ring that presses against the lower inner surface of the first riser pipe part or the lower inner surface of the riser pipe part when water is stopped by the stopcock is provided around the upper part of the stop cock. The water tank with an adjusted groundwater level for agricultural fields according to any one of claims 1 to 7.

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