JP5914744B1 - Water level adjusting device for paddy field, dam mechanism, and method for making rice field dam - Google Patents

Abstract

[PROBLEMS] To combine a water level adjuster installed in a paddle with a low-cost, low play and strong dam mechanism, and temporarily store paddy water and discharge it little by little to increase the amount of water stored in the rice field and dam the rice field. And providing a water level adjusting device for paddy fields that can prevent water damage by controlling the amount of water discharged. A water level adjustment plate having a variable height is installed in a main body of a paddle, which has a rear wall having a drainage hole and a pair of side walls standing upright in a plan view on a bottom plate to adjust the water level of a paddy field. In the water level adjuster to be performed, a vertical groove is provided in the pair of side walls located between the rear wall and the water level adjustment plate, and the drainage is formed at a lower height than the water level adjustment plate. A dam mechanism configured in a substantially U shape in plan view from a dam plate having a water discharge hole having a smaller diameter than the hole and a pair of support portions provided at both ends in the width direction of the dam plate, The drainage is performed while the paddy water overflowing the water level adjusting plate is stored in the water level adjuster by being inserted into the vertical groove in a direction in which the support portion is positioned in the left-right direction or the vertical direction of the dam plate. A water level adjusting device for paddy fields that discharges little by little from the hole to the drain hole side. [Selection] Figure 1

Description

  The present invention relates to a technique for preventing a downstream flood by preventing a paddy field from being dammed by providing a water level adjuster with a rice field dam mechanism and also suppressing the release of paddy water.

  Since paddy fields need to adjust the water level according to the growing season of rice, a water level adjuster (also called a water level adjusting paddy) is installed in the paddy. Various types of water level adjusters are known, but as an example, the water level adjuster is composed of a pressure receiving plate that receives earth pressure in the main body and a water level adjusting plate whose height position is regulated by pressure contact of the pressure receiving plate. Have been disclosed (see Patent Document 1).

Japanese Patent No. 4817159

  By the way, in recent years, abnormal weather has become normal, and there have been events that have been hit by local heavy rains in various places. On the other hand, the water retention capacity of the forests has declined, causing the occurrence of sediment discharge and frequent flood damage. Therefore, the purpose is to prevent the occurrence of disasters caused by rice dams that make the water storage capacity of paddy fields function as dams during rainfall, and prevent the rain that falls on the paddy fields from flowing down at once and causing floods and sediment-related disasters downstream. Technology is required.

  However, the conventional water level adjuster is intended to adjust the water level of the paddy field, and does not consider how to deal with a large amount of rain on the paddy field. It is discharged from the drainage hole of the main body, and when the discharge amount of the drainage hole cannot be handled, it is overflowing from the main body.

And even if the rice field has a water storage capacity and functions as a dam, the conventional water level regulator for paddy fields is not configured to store rainwater and release it little by little. For this reason, in the case of heavy rain, the current situation is that the water level adjustment plate can be raised to the maximum and raised, or a separate long plate can be installed in the water level adjustment device.
However, there is a problem that the work at the time of rain is dangerous and the effectiveness is not guaranteed because there are some people who are not cooperating with dams and there are no people like part-time farmers because it is troublesome.
Therefore, a proposal has been made to make a paddy field into a dam. As an example, there is a method in which one side of a dam plate is bitten and one side is floated and drained from a triangular opening. However, since it is not the structure which stores paddy water primarily and discharges little by little, there exists a problem that the setting of the discharge amount of water is troublesome.

  The purpose of the present invention is to combine a water level adjuster installed on the paddle with a low-cost, low backlash and strong dam mechanism to increase the amount of water stored in the rice field by temporarily storing and discharging the paddy water. An object of the present invention is to provide a paddy field water level adjusting device, a dam mechanism, and a paddy field damning method capable of making a rice field into a dam and suppressing flooding by preventing water discharge.

A first water level adjusting device for paddy fields according to the present invention includes a rear wall having a drainage hole and a pair of side walls standing on a bottom plate in a substantially square shape in plan view. In the water level adjuster for adjusting the water level of the paddy field by installing a vertical groove in the pair of side walls located between the rear wall and the water level adjustment plate, the height adjustment plate is formed taller than the water level adjustment plate. The dam plate having a water discharge hole smaller in diameter than the drainage hole on the lower side of the plate body and a pair of support portions provided at both ends in the width direction of the dam plate are configured in a substantially U shape in plan view. The dam mechanism is configured such that the pair of support portions are oriented in the left-right direction or the up-down direction of the dam plate, and open in the direction opposite to the paddy field side to form the substantially U-shape. By inserting into the groove, the paddy water that overflows the water level adjustment plate is stored in the water level adjuster while the release is performed. It discharged little by little from the hole to the drain hole side.

By configuring in this way,
(1) By providing a rice field dam mechanism in the water level adjuster installed in the paddy field, the paddy field has a dam function for storing rainwater, and the stored water is discharged little by little to prevent downstream flooding. Therefore, paddy fields can be effectively used to prevent flood damage.
(2) By assembling the dam mechanism once to the water level adjuster, the rice field dam function can be easily and inexpensively provided for many years without any construction work.
(3) In order to easily manufacture the dam mechanism at a low cost, if only a flat dam plate is used, it can be simplified without much trouble. However, even if this flat dam plate is accommodated in the groove of the current water level adjuster, the thickness dimension is small, so that the strength capable of withstanding water pressure cannot be obtained. Further, there is a difference between the thickness dimension of the groove and the thickness dimension of the flat dam plate, and there is a margin (for example, the groove is 20 mm, the flat dam plate is 3 mm, the margin is 17 mm, etc.). The plate-shaped dam plate may be deteriorated and damaged by metal fatigue due to the slight vibration of the paddy water returned. In order to solve these problems, the dam mechanism is formed in a substantially U-shape in plan view, shaped like both sides of a flat dam plate folded, increasing the strength of the main body and without rattling I was able to use it. Although it is conceivable to reduce the thickness dimension of the groove (for example, up to about 5 mm), it is difficult in the manufacturing method of the concrete iron making, and it takes time and cost.
(4) Since the dam mechanism is substantially U-shaped in plan view, the amount of material can be minimized, the cost can be reduced, the manufacturing work is also inexpensive, and the dam mechanism should be fitted in the vertical groove of the water level adjuster. Can be assembled easily.
(5) Two separate components, which have essentially different functions, a water level adjustment plate and a dam mechanism, are housed in a water level adjuster and provided as a single unit, so the farmer does not have to bother Can work on
(6) A busy farmer who does not need to look around even if there is a heavy rain forecast and eliminates dangerous work during the rain because it can be made into a dam by once assembling a dam mechanism consisting of dam plates to the water level adjuster There are many advantages, such as reducing the burden of the farmers and increasing the proportion of farmers who are reluctant to implement paddy fields into dams.

In the dam mechanism of the present invention, a water level adjusting plate having a variable height is installed in a main body of a paddle, which is formed by standing a rear wall having a drainage hole and a pair of side walls in a substantially square shape in a plan view. In the water level adjuster for adjusting the water level, it is located between the rear wall and the water level adjusting plate,
From a dam plate that is formed taller than the water level adjustment plate and has a water discharge hole having a smaller diameter than the drainage hole on the lower side of the plate body, and a pair of support portions provided at both ends in the width direction of the dam plate, A dam mechanism configured in a substantially U shape in plan view,
By the stoppers of the switching device attached to the dam plate, the pair of support portions are inserted into vertical grooves provided in the pair of side walls in a direction in which the pair of support portions are positioned in the left-right direction or the vertical direction of the dam plate. In the state where the regulation is released and the lower end of the dam plate is in contact with the bottom plate, the paddy water overflowing the water level adjusting plate is stored in the water level adjuster while slightly passing from the water discharge hole to the drain hole side. Discharge one by one ,
In a state where the lower end of the dam plate is regulated at a position higher than the drainage hole by the stopper of the switching device, the dam mechanism discharges the paddy water from the drainage hole ,
The switching device provided on the plate surface opposite to the paddy field side of the dam plate, the stopper of the rod-shaped body whose upper tip is bent at a substantially right angle, a pair of upper and lower locking tools, A plurality of pressing members that press the stopper so as not to move away from the dam plate, and when the upper tip of the stopper is engaged with the upper locking member, the lower end of the stopper Is higher than the lower end of the dam plate, the restriction by the stopper is released, and the lower end portion of the dam plate is in contact with the bottom plate, and the upper tip of the stopper is engaged with the lower locking tool. When doing so, the lower end of the stopper is at a position lower than the lower end of the dam plate, and the lower end portion of the dam plate is regulated at a position higher than the drainage hole .

The second water level adjusting apparatus for paddy fields according to the present invention is a water level adjusting plate having a variable height in the main body of the paddle, wherein the rear wall having a drainage hole and the pair of side walls are erected on the bottom plate in a substantially square shape in plan view. In the water level regulator that adjusts the water level of the paddy field, a dam plate that is formed taller than the water level adjustment plate and has a water discharge hole that is smaller in diameter than the drainage hole on the lower side, the rear wall and the water level In the state where the restriction by the stopper of the switching device attached to the dam plate is released and the lower end of the dam plate is in contact with the bottom plate, it overflows the water level adjustment plate. While storing the paddy water in the water level adjuster, it is gradually discharged from the water discharge hole to the drain hole side,
In a state where the lower portion is restricted to a position higher than the drain hole of the dam plate by a stopper of the switching device, a paddy field water level adjusting device for discharging the paddy water from the exhaust water hole,
The switching device provided on the plate surface opposite to the paddy field side of the dam plate, the stopper of the rod-shaped body whose upper tip is bent at a substantially right angle, a pair of upper and lower locking tools, A plurality of pressing members that press the stopper so as not to move away from the dam plate, and when the upper tip of the stopper is engaged with the upper locking member, the lower end of the stopper Is higher than the lower end of the dam plate, the restriction by the stopper is released, and the lower end portion of the dam plate is in contact with the bottom plate, and the upper tip of the stopper is engaged with the lower locking tool. When doing so, the lower end of the stopper is at a position lower than the lower end of the dam plate, and the lower end portion of the dam plate is regulated at a position higher than the drainage hole .

In the rice field dam formation method of the present invention, a rear wall having a drainage hole and a pair of side walls are provided with a water level adjusting plate having a variable height in the main body of a rice cake which is erected in a substantially square shape in plan view on the bottom plate. In the water level adjuster for adjusting the water level of the paddy field, a plate groove is provided between the rear wall and the water level adjusting plate, and a vertical groove is provided in the pair of side walls, and is formed taller than the water level adjusting plate. A dam plate having a water discharge hole smaller in diameter than the drainage hole on the lower side of the dam plate, and a pair of support portions provided at both ends in the width direction of the dam plate. The mechanism is inserted into the longitudinal groove in such a direction that the pair of support portions are positioned in the left-right direction or the up-down direction of the dam plate, and is opened to the opposite side of the paddy field to form the substantially U-shape. Fits the drainage hole from the water discharge hole while storing the paddy water overflowing the water level adjustment plate in the water level adjuster. It is discharged little by little.

  According to the present invention, the water level adjuster installed in the paddle is combined with a low-cost, low-fluctuating and strong dam mechanism, and the paddy water is temporarily stored and released gradually to increase the amount of water stored in the rice field. Paddy fields can be made into dams and water discharge can be controlled to prevent flood damage.

It is a perspective view of the water level adjustment apparatus for paddy fields in the 1st embodiment of the present invention. It is a perspective view of the dam mechanism in the 1st Embodiment of this invention. It is a top view of the water level adjustment apparatus for paddy fields in the 1st embodiment of the present invention. It is sectional drawing of the water level adjustment apparatus for paddy fields in the 1st Embodiment of this invention. It is a figure which shows the example of the switching apparatus in the 1st Embodiment of this invention. It is a figure which shows the modification of the switching apparatus in the 1st Embodiment of this invention. It is a figure which shows the example of the cover body in the 1st Embodiment of this invention. It is a perspective view of the water level adjustment apparatus for paddy fields in the 2nd embodiment of the present invention. It is a perspective view of the dam mechanism in the 2nd Embodiment of this invention.

  Hereinafter, a paddy field water level adjusting apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

  The water level adjuster 1 for paddy fields includes a paddle main body 2, a pressure receiving plate 3, a water level adjusting plate 4, a dam mechanism 5, and a switching device 10.

  The eaves body 2 is made of concrete, and includes a bottom plate 2A, a pair of side walls 2B standing at both ends in the width direction of the bottom plate 2A, and a rear wall standing at the rear end of the bottom plate 2A by connecting both ends in the width direction to the pair of side walls 2B. 2C, a drain hole 2D having a diameter of about 150 mm provided in the rear wall 2C, a guide groove 2E provided in the vertical direction facing the inner surfaces of the pair of side walls 2B, and a position corresponding to the position of the guide groove 2E ′ The pressure plate support groove 2F is provided on the upper surface of the bottom plate 2A.

  The pressure receiving plate 3 is installed in a substantially lower half of the rod main body 2 and has a shape in which a locking stopper 3B protrudes rearward from the upper end side of the plate main body 3A made of a flat plate, and both ends in the width direction are guide grooves 2E. The lower end is fitted into the pressure receiving plate support groove 2F.

  The water level adjusting plate 4 is located above the pressure receiving plate 3 and is inserted into the gutter main body 2. The water level adjusting plate 4 projects from the flat plate main body 4A and the lower end side of the plate main body 4A, and is in contact with the locking stopper 3B. The engaging stopper 4B is separated from the upper end of the plate main body 4A, and the projecting protrusion 4C is projected forward. The engaging stopper 4B is slidably fitted into the guide groove 2E at both ends in the width direction. The water level is adjusted by raising and lowering the state where 4B contacts the locking stopper 3B as an upper limit.

The dam mechanism 5 is made of aluminum or fiber reinforced synthetic resin, and includes a dam plate 6 and a pair of supports 7. The dam mechanism 5 is disposed between the rear wall 2 </ b> C of the paddy field water level adjuster 1 and the water level adjust plate 4. Provided, both ends in the width direction are fitted into the guide groove 2E ′, and the lower end is in contact with the upper surface of the bottom plate 2A.
In the dam plate 6, a water discharge hole 6 </ b> B having a diameter of about 50 mm is formed on the lower end side of a plate body 6 </ b> A made of a flat plate set to a height that is higher than the upper end 4 </ b> D when the water level adjusting plate 4 is pulled up most. In addition, the diameter of the water discharge hole 6B is not limited to the above numerical value, and is smaller than the water discharge hole 2D of the rear wall 2C, and the water discharge amount from the water discharge hole 6B is smaller than the water discharge amount from the water discharge hole 2D. It is sufficient if the paddy water can be stored in the size 8.
The pair of support bodies 7 are provided at both ends in the width direction of the dam plate 6 so as to be substantially U-shaped in plan view together with the dam plate 6. The pair of supports 7 have the same height as the dam plate 6.
Since it is substantially U-shaped, the amount of necessary members is reduced as compared with a substantially H-shape described later, and there is a merit of cost reduction.
It should be noted that the dam mechanism 5 is incorporated into the paddy field water level adjuster 1 and sold as a paddy field water level adjuster, but is sold as a dam mechanism 5 alone and incorporated into the existing paddy field water level adjuster 1. Either mode may be used.

A switching device 10 is attached to the dam mechanism 5. The switching device 10 includes, for example, a rod-like body (stopper) 10A whose upper end is bent at a substantially right angle as shown in FIG. 5, a pair of upper locking tools 10B, a lower locking tool 10C, a pressing tool 10D, 10E. When the upper tip of the rod-shaped body 10A is engaged with the upper locking tool 10B, the dam mechanism 5 is not restricted, while the upper tip of the rod-shaped body 10A is engaged with the lower locking tool 10C. The lower part of the rod-shaped body 10A becomes a replacement part, and the dam mechanism 5 is restricted so as to move the arrangement position upward. That is, in the state where the restriction by the rod-like body 10A of the switching device 10 is released and the lower end portion of the dam mechanism 5 is in contact with the bottom plate 2A, the paddy water is discharged little by little from the water discharge hole 6B, and the rod-like body 10A of the switching device 10A In a state where the lower end of the dam mechanism 5 is regulated at a position higher than the upper end of the drain hole 2D, the paddy water is discharged from the drain hole 2D.
In addition, the switching device 10 can be realized by various known mechanisms as schematically illustrated in FIG.
Moreover, when the switching device 10 is attached to the surface of the dam plate 6 on the side opposite to the rice field side of the dam mechanism 5, the farmer or the like can easily perform the switching work by reaching out from the fence.

For example, when all the paddy water is discharged by grooving or the like, the switching device 10 moves the arrangement position of the dam mechanism 5 upward to open all the lower part of the dam mechanism 5. Then, the paddy water is drained directly from the drainage hole 2D having a large diameter of the main body 2 and can be drained efficiently in a short time.
If the switching device 10 is not provided, it is necessary to remove the dam mechanism 5 and place it once in a bag, which may be lost, obstructed or damaged, but such inconvenience is avoided. The
After the grooving, if the paddy field is not used in winter or the like, the switching device 10 can move the arrangement position of the dam mechanism 5 upward and leave all the lower part of the dam mechanism 5 open. The snowmelt water in the rice field is drained directly from the drainage hole 2D having a large diameter in the main body 2, and the trouble of storing the dam mechanism 5 in a barn or the like and the situation of being damaged during storage can be avoided. is there.

  Next, the operation of the paddy field water level adjusting apparatus of the present embodiment and the method for forming a rice field dam will be described.

A space is defined by the bottom plate 2 </ b> A and the pair of side walls 2 </ b> B, the pressure receiving plate 3, the water level adjusting plate 4, and the dam plate 6 of the main body 2, by the water level adjuster 1 for paddy fields and the dam mechanism 5. Since the water discharge hole 6 </ b> B of the dam plate 6 is formed to have a smaller diameter than the drainage hole 2 </ b> D of the main body 2, the space functions as a storage tank 8 for paddy water that flows over the water level adjustment plate 4.
This will be described with reference to FIG. 4. Although the water level adjuster 1 has the water level A when the water level adjusting plate 4 is pulled up most, the paddy field water that flows over the water level adjusting plate 4 and flows into the storage tank 8. Since the water level is stored up to the upper end 6C of the dam plate 6, the water level of the rice field becomes the height of B, and the amount of stored water in the rice field increases to have a dam function. In this way, the rice field damification method is realized.
And since the stored water is controlled to the original height of the water level adjusting plate 4 after the rain has stopped by discharging the paddy water little by little from the water discharge hole 6B, it is not necessary to operate the dam plate 6.

  In addition, the space behind the dam plate 6 in the water level adjuster 1 for paddy fields functions as an overflow water treatment tank 9, and all the water that overflows the dam plate 6 due to heavy rain does not cross the shore. It is possible to drain the water in the interior, and it is possible to treat the overflow water when the water discharge hole 6B of the dam plate 6 cannot be discharged due to clogging with dust.

  In addition, as shown in FIG. 7, a lid made of iron or the like may be installed in a drop lid system or the like in the opening above the paddy field water level adjusting device. In this way, it is possible to avoid the risk that a farmer or the like accidentally falls into the paddy field water level adjusting device. In addition, a lid made of iron or the like may be installed by a dropping lid method or the like at the opening above the rear side of the dam plate 6 of the paddy field water level adjusting device (the rear wall 2C side of the main body 2). If it does in this way, attachment and removal of the dam board 6 will be attained with the lid installed.

According to the above embodiment,
(1) By providing a rice field dam mechanism in the water level adjuster installed in the paddy field, the paddy field has a dam function for storing rainwater, and the stored water is discharged little by little to prevent downstream flooding. Therefore, paddy fields can be effectively used to prevent flood damage.
(2) By assembling the dam mechanism once to the water level adjuster, the rice field dam function can be easily and inexpensively provided for many years without any construction work.
(3) In order to easily manufacture the dam mechanism at a low cost, if only a flat dam plate is used, it can be simplified without much trouble. However, even if this flat dam plate is accommodated in the groove of the current water level adjuster, the thickness dimension is small, so that the strength capable of withstanding water pressure cannot be obtained. Further, there is a difference between the thickness dimension of the groove and the thickness dimension of the flat dam plate, and there is a margin (for example, the groove is 20 mm, the flat dam plate is 3 mm, the margin is 17 mm, etc.). The plate-shaped dam plate may be deteriorated and damaged by metal fatigue due to the slight vibration of the paddy water returned. In order to solve these problems, the dam mechanism is formed in a substantially U-shape in plan view, shaped like both sides of a flat dam plate folded, increasing the strength of the main body and without rattling I was able to use it. Although it is conceivable to reduce the thickness dimension of the groove (for example, up to about 5 mm), it is difficult in the manufacturing method of the concrete iron making, and it takes time and cost.
(4) Since the dam mechanism is substantially U-shaped in plan view, the amount of material can be minimized, the cost can be reduced, the manufacturing work is also inexpensive, and the dam mechanism should be fitted in the vertical groove of the water level adjuster. Can be assembled easily.
(5) Two separate components, which have essentially different functions, a water level adjustment plate and a dam mechanism, are housed in a water level adjuster and provided as a single unit, so the farmer does not have to bother Can work on On the other hand, when the dam mechanism is provided as a single unit, the same effect as described above can be obtained by being attached to various existing water level adjusters.
(6) A busy farmer who does not need to look around even if there is a heavy rain forecast and eliminates dangerous work during the rain because it can be made into a dam by once assembling a dam mechanism consisting of dam plates to the water level adjuster This will increase the proportion of farmers who are reluctant to implement paddy field dams.
(7) With the switching device, there are many advantages such that the paddy water can be discharged little by little from the water discharge hole 6B or drained at once from the drain hole 2D, or can be easily switched.

  Next, a paddy field water level adjusting apparatus according to a second embodiment of the present invention will be described with reference to FIGS. Since the basic configuration is the same as that of the paddy field water level adjusting apparatus of the first embodiment, a duplicate description is omitted.

  The dam mechanism 50 includes a dam plate 60 and a pair of support plates 70 provided at both ends in the width direction of the dam plate 60 so as to form a substantially H shape in plan view together with the dam plate 60. The pair of supports 70 has the same height as the dam plate 60 and is set to have a front-rear width that fits between the rear wall 2 </ b> C and the water level adjusting plate 4.

  The dam mechanism 50 is provided with the switching device 10 similar to that of the first embodiment. When the switching device 10 is attached to the surface of the dam plate 50 opposite to the rice field side of the dam plate 50, a farmer or the like can easily perform the switching operation by reaching out from the fence.

In addition, although not illustrated one by one, the present invention may be implemented with various modifications within a range not departing from the gist thereof.
For example, the water discharge hole 6 </ b> B may be formed in an inverted U shape that opens downward so that the mold can be removed. In this way, the dam mechanism 5 can be manufactured easily and inexpensively.
In each of the above embodiments, the dam mechanism configured in a substantially U shape in plan view is inserted into the guide groove (vertical groove) with the pair of support portions positioned in the left-right direction of the dam plate. Although the fitting mode (ease of processing and excellent strength to withstand micro vibrations) has been described, a pair of support parts are positioned in the vertical direction of the dam plate. It is possible to adopt a mode in which it is inserted into a guide groove (vertical groove) in a direction to be performed (an attachment direction of the switching device is also changed).

DESCRIPTION OF SYMBOLS 1 Water level adjuster 2 Coral body 2A Bottom plate 2B Side wall 2C Rear wall 2D Drain hole 3 Pressure receiving plate 4 Water level adjust plate 5, 50 Dam mechanism 6, 60 Dam plate 6B Water discharge hole 7, 70 Support body 8 Storage tank 9 Overflow water treatment tank 10 Switching device

Claims (4)

A water level adjuster that adjusts the water level of a paddy field by installing a water level adjusting plate with a variable height in the main body of the paddle, which has a rear wall having a drainage hole and a pair of side walls standing upright in a plan view on the bottom plate. The vertical wall is provided between the rear wall and the water level adjusting plate, and the pair of side walls are provided with vertical grooves, which are formed taller than the water level adjusting plate and have a smaller diameter than the drainage hole on the lower side of the plate body. A dam mechanism configured in a substantially U shape in a plan view from a dam plate provided with a water discharge hole and a pair of support portions provided at both ends in the width direction of the dam plate, the pair of support portions The water level adjusting plate is inserted into the vertical groove in an orientation that is positioned in the left-right direction or the up-down direction of the dam plate and that is open to the opposite side of the paddy field and forms the substantially U-shape. The overflowing paddy water is stored in the water level adjuster and discharged gradually from the drainage hole to the drainage hole side. Paddy field water level adjustment device. A water level adjuster that adjusts the water level of a paddy field by installing a water level adjusting plate with a variable height in the main body of the paddle, which has a rear wall having a drainage hole and a pair of side walls standing upright in a plan view on the bottom plate. In, between the rear wall and the water level adjustment plate,
From a dam plate that is formed taller than the water level adjustment plate and has a water discharge hole having a smaller diameter than the drainage hole on the lower side of the plate body, and a pair of support portions provided at both ends in the width direction of the dam plate, A dam mechanism configured in a substantially U shape in plan view,
By the stoppers of the switching device attached to the dam plate, the pair of support portions are inserted into vertical grooves provided in the pair of side walls in a direction in which the pair of support portions are positioned in the left-right direction or the vertical direction of the dam plate. In the state where the regulation is released and the lower end of the dam plate is in contact with the bottom plate, the paddy water overflowing the water level adjusting plate is stored in the water level adjuster while slightly passing from the water discharge hole to the drain hole side. Discharge one by one ,
In a state where the lower end of the dam plate is regulated at a position higher than the drainage hole by the stopper of the switching device, the dam mechanism discharges the paddy water from the drainage hole ,
The switching device provided on the plate surface opposite to the paddy field side of the dam plate, the stopper of the rod-shaped body whose upper tip is bent at a substantially right angle, a pair of upper and lower locking tools, A plurality of pressing members that press the stopper so as not to move away from the dam plate, and when the upper tip of the stopper is engaged with the upper locking member, the lower end of the stopper Is higher than the lower end of the dam plate, the restriction by the stopper is released, and the lower end portion of the dam plate is in contact with the bottom plate, and the upper tip of the stopper is engaged with the lower locking tool. In this case, the lower end of the stopper is located at a position lower than the lower end of the dam plate, and the lower end portion of the dam plate is in a state of being regulated at a position higher than the drainage hole. A water level adjuster that adjusts the water level of a paddy field by installing a water level adjusting plate with a variable height in the main body of the paddle, which has a rear wall having a drainage hole and a pair of side walls standing upright in a plan view on the bottom plate. A dam plate formed taller than the water level adjusting plate and having a water discharge hole having a smaller diameter than the drainage hole on the lower side is disposed between the rear wall and the water level adjusting plate, In the state where the restriction by the stopper of the switching device attached to the bottom is released and the lower end portion of the dam plate is in contact with the bottom plate, the paddy water overflowing the water level adjustment plate is stored in the water level adjuster. Drain little by little from the drainage hole to the drainage hole side,
In a state where the lower portion is restricted to a position higher than the drain hole of the dam plate by a stopper of the switching device, a paddy field water level adjusting device for discharging the paddy water from the exhaust water hole,
The switching device provided on the plate surface opposite to the paddy field side of the dam plate, the stopper of the rod-shaped body whose upper tip is bent at a substantially right angle, a pair of upper and lower locking tools, A plurality of pressing members that press the stopper so as not to move away from the dam plate, and when the upper tip of the stopper is engaged with the upper locking member, the lower end of the stopper Is higher than the lower end of the dam plate, the restriction by the stopper is released, and the lower end portion of the dam plate is in contact with the bottom plate, and the upper tip of the stopper is engaged with the lower locking tool. When it does, the lower end of the said stopper is in the position lower than the lower end of the said dam board, and the water level adjustment apparatus for paddy fields used as the state where the lower end part of the said dam board was regulated in the position higher than the said drain hole. A water level adjuster that adjusts the water level of a paddy field by installing a water level adjusting plate with a variable height in the main body of the paddle, which has a rear wall having a drainage hole and a pair of side walls standing upright in a plan view on the bottom plate. The vertical wall is provided between the rear wall and the water level adjusting plate, and the pair of side walls are provided with vertical grooves, which are formed taller than the water level adjusting plate and have a smaller diameter than the drainage hole on the lower side of the plate body. A dam mechanism configured in a substantially U shape in a plan view from a dam plate provided with a water discharge hole and a pair of support portions provided at both ends in the width direction of the dam plate, the pair of support portions The dam plate is inserted in the vertical groove in an orientation that is located in the left-right direction or the up-and-down direction of the dam plate, and that is open to the opposite side of the paddy field to form the substantially U-shape. The paddy field drains little by little from the drainage hole to the drainage hole side while storing the paddy water to be stored in the water level regulator. Method of.

Images