Mounting member for drainage catch basin, and drainage catch basin

Abstract

To reduce a labor on farm work by satisfying both performing water-level adjustment and drainage amount adjustment by one member of a simple configuration and a simple operation, and preventing leakage which occurs in performing the adjustment.SOLUTION: A mounting member 3 for a drainage catch basin includes: a body part 31 which is attachable / detachable an approximately parallelly or in an inclined direction to / from a through surface 2a of a drainage catch basin body 2, and has an opening surface 31a including an opening 311; a closing member 32 which is installable approximately parallelly to the opening surface 31a and can close a part or the whole of the opening 311; and a rotation mechanism 322 which can rotate the closing member, wherein the rotation mechanism 322 includes a loosening prevention screw which can substantially fix the closing member 32 in a desired direction, and in a water-level adjusting state where the opening 311 becomes an upper side, the mechanism is constituted of being capable of substantially fixing the closing member 32 in a shallow water-dropping mode where a prescribed part P, which is provided separately from one side 31b of the body part 31 at an upper position than a fulcrum of the opening 311, is not closed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mounting member for a drop-out manhole and a drop-out manhole. [Background technology]

[0002] In agricultural work, water level adjustment plates are attached to the water outlet manholes to adjust the water level in farmland or rice paddies, etc. In addition, drainage volume adjustment devices are attached to the manholes to reduce the risk of flooding damage during heavy rain caused by drainage from rice paddies, etc.

[0003] Adjusting the water level and drainage volume can be a significant effort, especially for elderly farmers. From the perspective of reducing the effort required, Patent Document 1 proposes a water level adjustment device for paddy fields, comprising: a manhole body consisting of a rear plate and a pair of side plates with drainage holes, which are erected on a bottom plate in a roughly U-shape in plan view; a pressure plate disposed at the front lower part of the manhole body; a water level adjustment plate disposed in the manhole body in surface contact with the pressure plate so that its height is adjustable and it can be inserted and removed; a dam plate, which is a flat plate taller than the water level adjustment plate and has a water discharge hole on its lower side that is smaller in diameter than the drainage holes, positioned between the rear plate and the water level adjustment plate and arranged to be raised and lowered on the manhole body; and a dam plate support member connected between the dam plate and the manhole body, which enables the height of the dam plate to be adjusted. According to Patent Document 1, it is possible to quickly release large amounts of water from rice paddies, eliminate the risk of dam plates tipping over due to wind pressure, and prevent the dam plates from being lost or stolen.

[0004] The water level adjustment plate is usually attached via a groove provided in the water outlet basin, and in this case, the thickness of the water level adjustment plate is limited by the width of the groove.

[0005] The water level adjustment plate provided in the paddy field water level adjustment device of Patent Document 1 can be arranged in the Masumoto body with a variable height and detachably in a state of surface contact with the pressure receiving plate. That is, the water level adjustment plate is slidable in a state of surface contact with the pressure receiving plate. Therefore, when configuring the paddy field water level adjustment device of Patent Document 1 by retrofitting various members to an existing drop-in box, each of the pressure receiving plate and the water level adjustment plate is considered to be configured as a relatively thin plate having a thickness of about half or less than the thickness of the thickest plate among the water level adjustment plates that can be attached to the drop-in box.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, if the thickness of the water level adjustment plate is thin, it may bend under water pressure during use. Therefore, water leakage may occur from the gap generated by the bending. As a countermeasure against water leakage, it is conceivable to press mud into the gap, etc. However, if the plate thickness is thin, there is a concern that pressing the mud may cause the water level adjustment plate to bend further and create further gaps. This gap can be a cause of water leakage.

[0008] In addition, the paddy field water level adjustment device of Patent Document 1 also has a dam plate and a dam plate support in addition to the pressure receiving plate and the water level adjustment plate in order to realize the paddy field damming function. Therefore, the adjustment device has a relatively complex configuration with a relatively large number of parts, which can increase the management burden for agricultural workers. As a measure to reduce the number of parts, it is conceivable to configure the dam plate and the dam plate support separately. However, even if configured separately in this way, in such a device, when switching from water level adjustment to drainage volume adjustment, it is necessary to carry out the members for drainage volume adjustment one by one from a warehouse or the like and carry the removed members for water level adjustment into a warehouse or the like. Therefore, the management burden for agricultural workers remains increased.

[0009] An object of the present invention is to reduce the labor involved in agricultural work by achieving both water level adjustment and drainage volume adjustment with a single member having a simple structure and simple operation, and preventing water leakage that may occur during these adjustments.

Means for Solving the Problems

[0010] As a result of intensive studies to solve the above problems, the inventors of the present invention provided an opening that can be closed by a closing member on one side with respect to the center of the main body that is detachable from the drain port box, and configured a mounting member for the drain port box to switch between a water level adjustment state and a water drainage state depending on the position of the one side when attaching to the drain port box, and found that the above object can be achieved, thus completing the present invention. Specifically, the present invention provides the following.

[0011] The invention according to the first feature is detachably attached to the inner surface of the side plate of a drain port box having a through surface including a through hole communicating with a drainage channel, which is installed on the drainage side of a paddy field or farmland, in a substantially parallel or inclined direction with respect to the through surface, and includes a main body having an opening surface including an opening, and a closing member that can be installed substantially parallel to the opening surface and can close part or all of the opening. The opening is located on one side with respect to the center of the main body, and can be set to a water level adjustment state by attaching the main body to the drain port box so that the one side of the main body is located vertically above, and can be set to a water drainage state by attaching the main body to the drain port box so that the one side of the main body is located vertically below. A mounting member for a drain port box is provided.

[0012] The invention according to the first feature has an opening located on one side with respect to the center of the main body. Thereby, in the water level adjustment state where the main body is attached to the drain port box so that one side of the main body is located vertically above, the opening is vertically above the main body. Therefore, the water level of the paddy field or farmland is adjusted to a relatively high water level approximately equal to the height of the lower end of the opening vertically above the main body.

[0013] In addition, in the state where the water outlet is attached to the drop inlet frame such that one side of the main body is located vertically below due to the position of the above-described opening, the opening is located vertically below the main body. As a result, even if the water in the paddy field or farmland is at a relatively low water level about the height of the lower end of the opening located vertically below the main body, it is drained through the opening.

[0014] And in the invention according to the first feature, since the main body is detachable in a substantially parallel or inclined direction with respect to the through surface of the drop inlet frame via the groove formed on the inner surface of the side plate, the switching between the water level adjustment state and the water outlet state can be achieved by simply removing the mounting member for the drop inlet frame from the drop inlet frame and attaching it to the drop inlet frame in the desired state. This operation does not require the cumbersome work of transporting members for water level adjustment and / or members for water outlet one by one between the location of the drop inlet frame and a warehouse or the like.

[0015] In addition, the invention according to the first feature is provided with a closing member that can be installed substantially parallel to the opening surface and can block part or all of the opening, so that the drainage volume in water level adjustment and / or water outlet can be adjusted.

[0016] In addition, the main body of the invention according to the first feature is provided separately from the closing member capable of adjusting the drainage volume, and is not a water level adjustment plate that can slide in a state of being in surface contact with a pressure receiving plate as in Patent Document 1, so it can be configured to have substantially the same thickness as the thickest water level adjustment plate that can be attached to the drop inlet frame. Thereby, the main body can be prevented from being curved by water pressure or the like. Therefore, the work for coping with water leakage in water level adjustment and drainage volume adjustment can be reduced.

[0017] And the invention according to the first feature can achieve both water level adjustment and drainage volume adjustment with one mounting member for the drop inlet frame composed of a small number of parts. Thereby, agricultural workers can perform the desired adjustment between water level adjustment and drainage volume adjustment without spending the labor of using and managing a complicated device with a large number of parts.

[0018] Therefore, the invention according to the first feature can achieve both water level adjustment and drainage volume adjustment with a single member having a simple structure and simple operation, and reduce the work for dealing with water leakage in water level adjustment and drainage volume adjustment, thereby reducing the labor related to agricultural work.

[0019] The invention according to the second feature is the invention according to the first feature, and further includes a slide mechanism capable of adjusting the area of the opening in the open state by sliding the closing member along the opening surface, and provides a mounting member for a dropping hopper.

[0020] The invention according to the second feature can adjust the area of the opening by sliding the closing member via the slide mechanism. Thereby, the invention according to the second feature can achieve further drainage volume adjustment by a simple operation of sliding the closing member.

[0021] Therefore, the invention according to the second feature can achieve both water level adjustment and drainage volume adjustment with a single member having a simple structure and simple operation, and reduce the work for dealing with water leakage in water level adjustment and drainage volume adjustment, thereby reducing the labor related to agricultural work.

[0022] The invention according to the third feature is the invention according to the second feature, and the slide mechanism includes a locking mechanism capable of locking the closing member at a position where the entire opening is closed, and a rotation mechanism capable of rotating the closing member about a fulcrum which is a point on the outer periphery of the closing member in the state where the closing member is locked and is closer to the center of the main body than the center of the opening, and provides a mounting member for a dropping hopper.

[0023] The invention according to the third feature can lock the closing member at a position where the entire opening is closed by the locking mechanism. Thereby, it can be prevented that unintended drainage is performed due to the movement of the closing member or the like. Thereby, the labor for agricultural workers to deal with unintended drainage can be reduced.

[0024] In addition, the closing member of the invention according to the third feature can close a part of the opening closer to the center of the main body portion by rotating about a fulcrum. That is, in the water level adjustment state, the closing member can close a part of the vertically lower side of the opening. Thereby, the invention according to the third feature can adjust the water level to a height different from the lower end of the opening in the water level adjustment state by a simple operation of rotating the closing member.

[0025] Conversely, in the water drainage state, contrary to the water level adjustment state, the closing member can close a part of the vertically upper side of the opening. Thereby, the invention according to the third feature can achieve both adjusting the drainage volume in the water drainage state by a simple operation of rotating the closing member and continuing drainage even at a water level as low as the lower end of the opening.

[0026] Therefore, the invention according to the third feature can achieve both adjusting the water level and the drainage volume by one member with a simple structure and a simple operation, and reducing the work of dealing with water leakage in the water level adjustment and the drainage volume adjustment, thereby reducing the labor related to agricultural work.

[0027] The invention according to the fourth feature is the invention according to any one of the first to third features, and provides a mounting member for a dropping box in which the closing member is provided only on one of the opening surfaces, and the closing member is not provided on the other opening surface.

[0028] The mounting member for a dropping box of the invention according to the fourth feature can be attached to the dropping box such that the opening surface provided with the closing member faces the paddy field or farmland side of the dropping box. Thereby, the closing member can be pressed against the main body portion by the water pressure of the water flowing from the paddy field or farmland side into the through hole and can be in close contact with the main body portion. Thereby, water leakage in the water level adjustment and the drainage volume adjustment can be reduced.

[0029] In addition, the closing member pressed against the main body by water pressure can be fixed in a state where it does not block the opening, a state where it blocks a part of the opening, or a state where it blocks the entire opening. Thereby, it is possible to prevent the unfixed closing member from moving and the state of the closing member from changing. Therefore, the trouble of returning the closing member to a desired state one by one according to the change in the state of the closing member can be saved.

[0030] Therefore, the invention according to the fourth feature can achieve both water level adjustment and drainage volume adjustment by one member with a simple configuration and simple operation, and reduce the work for dealing with water leakage in water level adjustment and drainage volume adjustment, thereby reducing the labor related to agricultural work.

[0031] The invention according to the fifth feature is installed on the drainage side of a paddy field or farmland, and is detachable in a direction substantially parallel or inclined to the through surface via a groove formed on the inner surface of the side plate of the drain box having a through surface including a through hole communicating with a drainage channel. It includes a main body portion having an opening surface including an opening, a closing member that can be installed substantially parallel to the opening surface and can block a part or all of the opening, and a point on the outer periphery of the closing member when the closing member blocks the opening. It is provided with a rotation mechanism that can rotate the closing member around a fulcrum located closer to the center of the main body portion than the center of the opening. The opening is located on one side with respect to the center of the main body portion, and the water level can be adjusted by attaching it to the drain box so that the one side of the main body portion is located vertically above, and the water can be made to fall by attaching it to the drain box so that the one side of the main body portion is located vertically below. The rotation mechanism includes a lock nut that can substantially fix the closing member in a desired direction. In the water level adjustment state, it is configured to be able to substantially fix the closing member in a shallow water falling mode where a predetermined portion of the opening provided away from the one side of the fulcrum is not blocked, and provides a mounting member for a drain box.

[0032] That is, the invention according to the fifth feature is the invention according to the first feature, and further includes a rotation mechanism that can rotate the closing member about a fulcrum that is a point on the outer periphery of the closing member when the closing member closes the opening and is closer to the center of the main body than the center of the opening. The rotation mechanism includes a lock nut that can substantially fix the closing member in a desired orientation. In the water level adjustment state, the closing member is configured to be substantially fixable in a shallow water drainage mode in which a predetermined portion of the opening provided away from the one side of the fulcrum is not blocked, providing a mounting member for a dropping port box.

[0033] The invention according to the fifth feature has an opening located on one side with respect to the center of the main body. Thereby, in the water level adjustment state in which one side of the main body is attached to the dropping port box so as to be located vertically above, the opening is vertically above the main body. Therefore, the water level of the paddy field or farmland is adjusted to a relatively high water level about the height of the lower end of the opening vertically above the main body.

[0034] Also, due to the position of the above-described opening, in the water drainage state in which one side of the main body is attached to the dropping port box so as to be located vertically below, the opening is vertically below the main body. As a result, the water in the paddy field or farmland is drained through the opening even at a relatively low water level about the height of the lower end of the opening vertically below the main body.

[0035] And in the invention according to the fifth feature, since the main body is detachable with respect to the penetration surface of the dropping port box in a substantially parallel or inclined direction, switching between the water level adjustment state and the water drainage state only requires removing the mounting member for the dropping port box from the dropping port box and attaching it to the dropping port box in a desired state. This operation does not require a cumbersome operation of transporting members for water level adjustment and / or members for water drainage one by one between the location of the dropping port box and a warehouse or the like.

[0036] Moreover, the invention according to the fifth feature can be installed substantially parallel to the opening surface, and is provided with a closing member that can close part or all of the opening in a state of being substantially fixed in a desired direction by a rotation mechanism using a set screw, so that the water level can be adjusted and / or the drainage volume in the case of water falling can be adjusted. The set screw enables the force (torque) required for the rotation of the closing member to be applied by the user's hand and to be substantially fixed to a given torque that cannot be moved by water pressure or the like. Therefore, the invention according to the fifth feature can change the state of the closing member to a state of closing a part of the upper side of the opening, a state of closing a part of the lower side, a state of closing all, a state of no closing, etc. by a simple operation of changing the direction of the closing member by a rotation mechanism using a set screw.

[0037] In addition, the invention according to the fifth feature realizes a configuration in which the closing member can be substantially fixed in a shallow water falling mode in which a predetermined portion provided away from one side from the fulcrum in the opening is not closed by a rotation mechanism using a set screw. Thereby, the invention according to the fifth feature can adjust the water level of the farmland or the like at the timing when a relatively low water level is desired, as exemplified by the mid-drying period of rice. In addition, since the shallow water falling mode is a state in which the low position is not closed, even in the case of increased water level exemplified by sudden heavy rain or the like, the drainage volume by the water flowing through the attachment member for the drop port into the drainage channel can be suppressed, and the drainage channel can be prevented from overflowing.

[0038] In addition, the main body of the invention according to the fifth feature is provided separately from the closing member capable of adjusting the drainage volume, and is not a water level adjustment plate that can slide in a state of surface contact with a pressure receiving plate as in Patent Document 1, so it can be configured to have substantially the same thickness as the thickest water level adjustment plate that can be attached to the drop port. Thereby, the main body can be prevented from being curved by water pressure or the like. Therefore, the work for coping with water leakage in water level adjustment and drainage volume adjustment can be reduced.

[0039] And the invention according to the fifth feature can achieve both water level adjustment and drainage volume adjustment with a mounting member for a dropping port box configured with a small number of parts. As a result, agricultural workers can perform desired adjustment among water level adjustment and drainage volume adjustment without expending the labor of using and managing a complicated device with a large number of parts.

[0040] Therefore, the invention according to the fifth feature can achieve both performing water level adjustment and drainage volume adjustment with a single member having a simple configuration and simple operation, and reducing the work for dealing with water leakage in water level adjustment and drainage volume adjustment, thereby reducing the labor related to agricultural work.

[0041] The invention according to the sixth feature is the invention according to the fifth feature, and provides a mounting member for a dropping port box, wherein the lock nut includes a lock nut that generates a preloading torque between a nut and a bolt.

[0042] The invention according to the sixth feature improves the durability of the lock nut compared to a configuration using a member that increases frictional force such as nylon with a lock nut that generates a preloading torque. Also, the invention according to the sixth feature realizes better usability than a wire lock that fixes a wire through a hole provided in the screw after tightening the screw with a lock nut that generates a preloading torque.

[0043] Therefore, the invention according to the sixth feature can achieve both performing water level adjustment and drainage volume adjustment with a single member having a simple configuration and simple operation, and reducing the work for dealing with water leakage in water level adjustment and drainage volume adjustment, thereby reducing the labor related to agricultural work.

[0044] The invention according to the seventh feature provides a dropping port box including a dropping port box body having a through surface including a through hole installed on the drainage side of a paddy field or farmland and communicating with a drainage channel, and a mounting member for a dropping port box of the invention according to any one of the first to sixth features.

[0045] According to the invention related to the seventh feature, the state of the water discharge box can be switched to the water level adjustment state or the water discharge state by a relatively simple operation of removing the attachment member for the water discharge box from the water discharge box and attaching it to the water discharge box in a desired state.

[0046] Further, according to the invention related to the seventh feature, since the main body portion of the attachment member for the water discharge box can be configured to have substantially the same thickness as the thickest one among the water level adjustment plates that can be attached to the water discharge box, the main body portion can be prevented from bending due to water pressure or the like. Therefore, the work for coping with water leakage in water level adjustment and drainage volume adjustment can be reduced.

[0047] In addition, according to the invention related to the seventh feature, since the attachment member for the water tank has a simple structure with a small number of parts, farmers can perform water level adjustment and drainage volume adjustment without spending the labor of using and managing a complicated device with a large number of parts.

[0048] Therefore, the invention related to the seventh feature can achieve both performing water level adjustment and drainage volume adjustment with one member having a simple configuration and reducing the work for coping with water leakage in water level adjustment and drainage volume adjustment, and can reduce the labor related to agricultural work.

Effect of the Invention

[0049] The present invention can achieve both performing water level adjustment and drainage volume adjustment with one member having a simple configuration and a simple operation and reducing the work for coping with water leakage in water level adjustment and drainage volume adjustment, and can reduce the labor related to agricultural work.

Brief Description of the Drawings

[0050]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0051] The following is an example of a preferred embodiment for carrying out the present invention, which will be described with reference to the drawings. Note that this is merely an example, and the technical scope of the present invention is not limited thereto.

[0052] <Dropping port box 1> FIG. 1 is a diagram showing an outline of the dropping port box 1 to which the attachment member 3 for the dropping port box is attached in a water level adjustment state. The dropping port box 1 is installed on the drainage side of a paddy field or farmland (such as farmland), and includes a dropping port box main body 2 and an attachment member 3 for the dropping port box.

[0053] 〔Dropping port box main body 2〕 The dropping port box main body 2 has a through surface 2a including a through hole 2b communicating with a drainage channel. The lower end of the through hole 2b preferably substantially coincides with the lower end of the through surface 2a. That is, the lower end of the through hole 2b preferably substantially coincides with the bottom surface inside the dropping port box main body 2. Thereby, drainage through the through hole 2b is performed more reliably.

[0054] The size of the dropping port box main body 2 is not particularly limited, and may be an appropriate size according to the ridge height and / or the drainage depth, etc. The dropping port box main body 2 has an attachment mechanism for detachably attaching various plate-like members such as the attachment member 3 for the dropping port box of the present embodiment and the water level adjustment plate of the prior art, which is exemplified by the groove 2c, in a direction substantially parallel or inclined to the through surface 2a. By attaching various plate-like members through an attachment mechanism such as the groove 2c, water level adjustment and the like are performed.

[0055] [Mounting member 3 for the drain port box] FIG. 2 is a diagram showing an outline of the mounting member 3 for the drain port box when viewed from the front. The mounting member 3 for the drain port box includes at least a main body portion 31 and a closing member 32.

[0056] [Main body portion 31] The main body portion 31 is detachable in a direction substantially parallel or inclined with respect to the through surface 2a of the above-described drain port box main body 2, and has an opening surface 31a including an opening 311. The opening 311 is located on one side 31b with respect to the center of the main body portion 31. With such a configuration, the main body portion 31 can be attached by switching between a water level adjustment state and a water discharge state, which will be described later.

[0057] Returning to FIG. 1. In FIG. 1, the mounting member 3 for the drain port box is in a water level adjustment state attached to the drain port box main body 2 such that one side 31b of the main body portion 31 is located vertically above. The mounting member 3 for the drain port box in the water level adjustment state can adjust the water level of farmland or the like to a relatively high water level approximately equal to the height of the lower end of the opening 311 located vertically above the main body portion 31.

[0058] FIG. 3 is a diagram showing the drain port box 1 to which the mounting member 3 for the drain port box is attached in the water discharge state. Due to the position of the above-described opening 311, in the water discharge state where the mounting member 3 for the drain port box is attached to the drain port box main body 2 such that one side 31b of the main body portion 31 is located vertically below, the opening 311 is located vertically below the main body portion 31. As a result, the water in the farmland or the like is drained through the opening 311 even at a relatively low water level approximately equal to the height of the lower end of the opening 311 located vertically below the main body portion 31.

[0059] Since the main body portion 31 is detachable in a direction substantially parallel or inclined with respect to the through surface 2a of the drain port box main body 2, switching between the water level adjustment state and the water discharge state only requires removing the mounting member 3 for the drain port box from the drain port box main body 2 and attaching it to the drain port box main body 2 in a desired state. This operation does not require a complicated operation of transporting members for water level adjustment and / or members for water discharge one by one between the location of the drain port box and a warehouse or the like.

[0060] The material of the main body 31 is not particularly limited. The material of the main body 31 may be, for example, synthetic resin such as polyvinyl chloride, wood, concrete, metal, etc. Among them, the material of the main body 31 is preferably a relatively inexpensive synthetic resin having water resistance exemplified by synthetic resin mainly composed of polyvinyl chloride. Thereby, the main body 31 can have water resistance, be lightweight, and excellent in cost effectiveness.

[0061] The material of the main body 31 is preferably a relatively inexpensive synthetic resin having water resistance exemplified by synthetic resin mainly composed of polyvinyl chloride and having a strength that can be cut by household tools, tools for agricultural workers, etc. Thereby, the user can separate a part of one side 31b or another part away from one side 31b from the main body 31 according to the desired water level. Also, thereby, the user can procure a plurality of mounting members 3 for the dropping port box inexpensively and operate by separating a part or another part of each according to a set of desired water levels and preparing them.

[0062] One side 31b attached to the dropping port box main body 2 in the water level adjustment state via the groove 2c preferably substantially coincides with the upper end of the groove 2c (FIG. 1). That is, the height when one side 31b of the main body 31 is upward preferably substantially coincides with the length from the upper end to the lower end of the groove 2c provided in the dropping port box main body 2. Thereby, when attached to the dropping port box main body 2 configured to an appropriate size according to the bank height and / or the drainage depth, etc., the mounting member 3 for the dropping port box can adjust the water level to the bank height and / or the drainage depth.

[0063] The thickness of the main body 31 is preferably 60% or more of the thickness of the thickest plate that can be attached via the groove 2c, and more preferably 80% or more. Thereby, it can be prevented that the main body 31 is curved by water pressure etc. from the side of the farmland etc. to the side of the main body 31. Therefore, the work corresponding to water leakage in water level adjustment and drainage volume adjustment can be reduced. Since the mounting member 3 for the dropping port box of this embodiment is not a member combining a plurality of slidable plates, it can have such a thick and robust configuration.

[0064] The main body portion 31 preferably has fitting portions (for example, the first fitting portion 31f and the second fitting portion 31g shown in FIG. 6) that can be fitted with the size-changing member 5 described later on one side 31b or the other side facing one side 31b. Thereby, water leakage when the size of the main body portion 31 is changed by the size-changing member 5 is reduced. In FIG. 6, the first fitting portion 31f is shown as having a convex shape and the second fitting portion 31g is shown as having a concave shape, but conversely, the first fitting portion 31f may have a concave shape and the second fitting portion 31g may have a convex shape. Also, both the first fitting portion 31f and the second fitting portion 31g may have concave and convex shapes. Also, if separation of the main body portion 31 and the size-changing member 5 is not necessary, the fitting portions may be integrated using an adhesive, waterproof tape, screws, etc. to further reduce water leakage from around the fitting portions.

[0065] The first fitting portion 31f and the second fitting portion 31g may be made of a material with high wear resistance. Examples of such materials include metal materials such as stainless steel.

[0066] It is preferable that the distance from the portion closest to one side 31b to one side 31b of the opening 311 is 80 mm or less, and more preferably 60 mm or less. Thereby, even when the water level in farmland or the like is a low water level corresponding to the above distance, drainage is preferably performed. It is preferable that the distance from the portion closest to one side 31b to one side 31b of the opening 311 is 20 mm or more, and more preferably 40 mm or more. Thereby, the outflow of sediment that agricultural workers dislike is prevented.

[0067] The opening 311 is preferably configured such that the distance from one end 31d of one side 31b is greater than the distance from the other end 31e (FIG. 2). That is, when the attachment member 3 for the drop mouth box in the water level adjustment state or the falling water state is viewed from the front in a direction perpendicular to the opening surface 31a, it is preferable that the opening 311 is provided so as to be offset to either the left or right of the opening surface 31a (FIGS. 1 and 3). Thereby, a part or all of the region on the one end 31d side of the opening 311 in the open state can be used as the region for arranging the closing member 32 in the open state (FIG. 2).

[0068] The shape of the opening 311 is not particularly limited and may be various shapes such as a substantially circular shape, a substantially elliptical shape, a substantially rhombic shape, a substantially trapezoidal shape, a substantially rectangular shape, etc. Among these, the shape of the opening 311 is preferably a shape in which the central side end of the main body 31 of the opening 311 spreads from the central side toward one side 31b, as exemplified by a substantially circular shape, a substantially elliptical shape, a rhombic shape, a trapezoidal shape, etc. Thereby, in the water level adjustment state, the water level adjusting member 3 can adjust the water level so that the drainage volume decreases as the water level approaches the lower end of the opening 311. The shape of the opening 311 is more preferably a substantially circular shape. Thereby, floating substances near the surface of the water drained from agricultural land or the like can be prevented from being caught on the corners of the opening 311 and clogging the opening 311.

[0069] When reducing the labor involved in manufacturing, the shape of the opening 311 is preferably a shape in which the outer circumference is not included in the circle among substantially circular shapes (FIG. 1). Thereby, the main body 31 can be manufactured by relatively simple processing using a tool for making a circular hole such as a hole saw. Further, when further improving the accuracy of water level adjustment, the shape of the opening 311 is more preferably a substantially lacking circular shape in which the left and right sides of the circle are lacking when viewed with one side 31b facing up, and the lacking portions respectively constitute substantially linear portions in the vertical direction (FIG. 2). Thereby, it is possible to prevent floating substances from being caught in the curved portion, and the drainage volume when the water level corresponds to the substantially linear portion becomes substantially constant, and the accuracy of water level adjustment can be improved.

[0070] [Blocking member 32] The blocking member 32 is a member that can be installed substantially parallel to the opening surface 31a and can block part or all of the opening 311. The blocking member 32 can adjust the water level and / or the drainage volume during water drainage. The material of the blocking member 32 may be the same as that of the main body 31.

[0071] The blocking member 32 is preferably provided only on one opening surface (opening surface 31a) and not on the other opening surface (not shown). Thereby, the attachment member 3 for the dropping port can be attached to the dropping port body 2 such that the opening surface 31a provided with the blocking member 32 faces the side of the farmland or the like of the dropping port 1. Further, thereby, the blocking member 32 can be pressed against the main body portion 31 by the water pressure of the water flowing from the side of the farmland or the like into the through hole 2b and can be in close contact with the main body portion 31. Therefore, water leakage in the water level adjustment and the drainage volume adjustment can be reduced.

[0072] Further, the blocking member 32 pressed against the main body portion 31 by the water pressure applied from the side of the farmland or the like to the side of the main body portion 31 can be more firmly fixed in a fully open state where the opening 311 is not blocked, an open state where a part of the opening 311 is blocked, or a closed state where the entire opening 311 is blocked, etc. Thereby, it is possible to further prevent the non-fixed blocking member 32 from moving and the state of the blocking member 32 from changing. Therefore, the labor of returning the blocking member 32 to a desired state one by one according to the change in the state of the blocking member 32 can be further saved.

[0073] The shape of the blocking member 32 is not particularly limited as long as it can block a part or all of the opening 311. When the opening 311 is substantially circular, the shape of the blocking member 32 is preferably substantially circular as well. Thereby, the blocking member 32 is configured to minimize the blank portion on the outside of the opening 311 in a state where the entire opening 311 is blocked. Similarly, when the opening 311 has other shapes, by making the shape of the blocking member 32 the same as the shape of the opening 311, the blank portion can be minimized.

[0074] The blocking member 32 preferably has a gripping mechanism 32a that can move the blocking member 32 by holding it by hand and / or operating it with the operation means 4 described later, an instrument with a long handle, etc. The gripping mechanism 32a is, for example, a protrusion, a knob, etc. provided on a side different from the opening surface 31a of the blocking member 32. Thereby, agricultural workers or the like can easily slide the blocking member 32 using the slide mechanism 33 described later.

[0075] [Slide mechanism 33] The attachment member 3 for the drop-in box preferably includes a slide mechanism 33 capable of adjusting the area of the opening 311 in the open state by sliding the closing member 32 along the opening surface 31a. As a result, the area of the opening 311 can be adjusted. Therefore, agricultural workers can achieve further drainage adjustment by a simple operation of sliding the closing member 32.

[0076] The slide mechanism 33 is not particularly limited. The slide mechanism 33 preferably has a locking mechanism 331 and a rotation mechanism 332. The locking mechanism 331 is a mechanism capable of locking the closing member 32 at a position where it closes the entire opening 311. The rotation mechanism 332 is a mechanism capable of rotating the closing member 32 about a fulcrum which is a point on the outer periphery of the closing member 32 in a state where the closing member 32 is locked and which is located closer to the center 31c of the main body 31 than the center of the opening 311.

[0077] When the opening 311 and the closing member 32 are substantially circular and are configured such that the distance from one end 31d of one side 31b is greater than the distance from the other end 31e, the above-mentioned fulcrum is preferably in the range of 90° to 150° with respect to the direction from the center of the opening 311 to one side 31b as seen from the center of the opening 311, and is provided at a position closer to one end 31d than the center of the opening 311.

[0078] When the fulcrum and one end 31d have the above-mentioned positional relationship and the direction of the fulcrum as seen from the center of the opening 311 is 90° or more, the upper side of the closing member 32 can be brought closer to horizontal when the water level is made relatively low in the water level adjustment state. As a result, the accuracy of water level adjustment when the water level is made relatively low can be increased. Also, when the fulcrum and one end 31d have the above-mentioned positional relationship and the direction of the fulcrum as seen from the center of the opening 311 is 150° or less, the upper side of the closing member 32 can be brought closer to horizontal when the water level is made relatively high in the water level adjustment state. As a result, the accuracy of water level adjustment when the water level is made relatively high can be increased.

[0079] Among these, it is particularly preferable that the position of the fulcrum is 105° to 135° with respect to the direction in which the direction seen from the center of the opening 311 faces one side 31b from the center of the opening 311, and is provided at a position closer to one end 31d than the center of the opening 311 (FIG. 1). Thereby, the accuracy when the water level is relatively low and the accuracy when the water level is relatively high can be further reconciled.

[0080] The locking mechanism 331 is not particularly limited, and may be, for example, a stopper composed of a protrusion or the like. The rotation mechanism 332 is not particularly limited, and may be, for example, one that passes through a rotation shaft configured using a bolt or the like in a hole provided in the closing member 32. The locking mechanism 331 can lock the closing member 32 at a position where the entire opening 311 is closed. Thereby, it is possible to prevent the closing member 32 from moving due to gravity, the force of water, etc. and unintended drainage from occurring. Therefore, the labor for agricultural workers to deal with unintended drainage can be reduced.

[0081] The rotation mechanism 332 preferably includes a fixture capable of applying a force to the closing member 32 via a rotation shaft and generating friction between the closing member 32 and the main body portion 31. Thereby, the rotation mechanism 332 can substantially fix its position in a state where the area of the opening 311 in the open state is adjusted.

[0082] Examples of such a fixture include a fixture using a spring force such as a combination of a double nut and a spring washer. By disposing a spring washer on the side closer to the main body portion 31 of the double nut with two nuts stacked, the spring washer presses the closing member 32 against the main body portion 31. Therefore, friction is generated between the closing member 32 and the main body portion 31, and the closing member 32 can substantially fix its position in an arbitrary state. Since a double nut is used, loosening of the nut is prevented even if the spring washer presses the double nut in a direction away from the main body portion 31.

[0083] The material of the slide mechanism 33 is not particularly limited as long as it has water resistance. The material of the slide mechanism 33 may be, for example, various synthetic resins having water resistance, stainless steel, or the like.

[0084] The slide mechanism 33 preferably further includes a movement prevention mechanism 333 that prevents the closing member 32 in the closed state from moving away from the main body portion 31. Thereby, it is possible to prevent the closing member 32 in the closed state from separating from the main body portion 31 and causing water leakage. The movement prevention mechanism 333 may be, for example, a cover, a guard, etc. that can cover a part of the outer periphery of the closing member 32 in the closed state from a side different from the main body portion 31 as viewed from the closing member 32 (FIG. 2).

[0085] (Locking screw) The slide mechanism 33 preferably has a rotation mechanism 332 including a locking screw that can manually change the orientation of the closing member 32 and substantially fix the closing member 32 in a desired orientation. The rotation mechanism 332 including the locking screw is a mechanism that can rotate the closing member 32 about a fulcrum that is a point on the outer periphery of the closing member 32 when the closing member 32 closes the opening 311 and is located closer to the center 31c of the main body portion 31 than the center of the opening 311. The locking screw enables the force (torque) required for the rotation of the closing member 32 to be applied by the user's hand and to be substantially fixed to a given torque that is not moved by water pressure or the like. Therefore, this configuration enables the state of the closing member to be changed to a state of closing a part of the upper side of the opening 311, a state of closing a part of the lower side of the opening 311, a state of closing the whole, a state of no closing, etc. by a simple operation of changing the orientation of the closing member 32.

[0086] FIG. 7 is a diagram schematically showing an example of the falling port box 1 in the shallow water falling mode. The slide mechanism 33 in this example has a rotation mechanism 332 including a locking screw and does not include a locking mechanism 331. As shown in this example, the slide mechanism 33 having the above-described configuration using a locking screw preferably does not include the locking mechanism 331. Thereby, in the above-described water level adjustment state, this configuration can realize a shallow water falling mode in which a part of the lower side of the opening 311 is closed without being hindered by the locking mechanism 331 by a simple operation of changing the orientation of the closing member 32.

[0087] With the above-described configuration using the anti-loosening screw, even if the slide mechanism 33 is not provided with the locking mechanism 331, the closing member 32 can block part or all of the opening 311 in a state of being substantially fixed in a desired orientation. As a result, in the water level adjustment state described above, the rotation mechanism 332 can substantially fix the closing member 32 in a shallow water mode in which a predetermined portion P provided away from one side 31b from the fulcrum among the openings 311 is not blocked (FIG. 7). The predetermined portion P is, for example, the portion surrounded by the dashed line below the opening 311 in FIG. 7. The effects brought about by various modes such as the shallow water mode will be described in detail later.

[0088] The configuration of the anti-loosening screw is not particularly limited. The configuration of the anti-loosening screw may be, for example, a configuration using an anti-loosening nut, a configuration using a Nord-Lock washer, a wire lock, or the like. In particular, from the viewpoints of improving durability and usability, the anti-loosening nut is preferably configured such that the nut does not rotate due to the preloading torque generated between the nut and the bolt by the frictional force brought about by the elastic force by which a friction ring exemplified by a U-NUT (registered trademark) or the like biases.

[0089] In addition, from the viewpoint of improving usability, the anti-loosening nut may be configured such that the nut does not rotate due to the preloading torque generated between the nut and the bolt by the frictional force brought about by a member (for example, nylon or the like) that increases the frictional force provided on a part of the nut. The Nord-Lock washer is composed of, for example, two washers with cams applied thereto. As a result, when the screw tends to loosen, the camming effect of the cams applied to the two washers prevents the loosening. The wire lock is configured to pass a wire through a hole provided in the screw after tightening the screw to fix the screw. Although the wire lock is inferior to a configuration using an anti-loosening nut in terms of usability due to the trouble of passing the wire, it can surely prevent the screw from loosening.

[0090] 〔Operating means 4〕 Although not an essential aspect, it is preferable that the mouthpiece 1 further includes an operating means 4 (assist device) capable of operating the gripping mechanism 32a. As the operating means, for example, a gripping hole 42 through which the gripping mechanism 32a can be passed is provided at a position closer to one end 41b than the center 41a of the elongated operating means main body 41, and a handle-like member is configured such that at least a part of the position closer to the other end 41c than the center 41a can be gripped (FIG. 3).

[0091] Thereby, an agricultural worker or the like can hook the gripping mechanism 32a in the gripping hole 42 and operate the gripping mechanism 32a without exerting the labor of deeply bending to operate the gripping mechanism 32a. The operating means main body 41 is more preferably substantially plate-shaped, and the length in the longitudinal direction when viewed from the side of the plate surface is preferably 3 times or more the length in the short direction. Thereby, the manufacturing and storage of the operating means main body 41 can be facilitated.

[0092] The length in the longitudinal direction of the operating means 4 is not particularly limited, and may be, for example, 50 to 100 cm. Thereby, it is possible to facilitate storage and transportation and to easily operate the gripping mechanism 32a. The material of the operating means 4 is not particularly limited. The material may be, for example, a lightweight material excellent in durability and cost-effectiveness, exemplified by aluminum / aluminum alloy.

[0093] 〔Size changing member 5〕 FIG. 6 is a view showing an example of the size changing member 5. The mouthpiece 1 may include a size changing member 5 (also referred to as a "bench") capable of changing the size of the main body portion 31 of the mouthpiece mounting member 3. The size changing member 5 is not particularly limited as long as it can change the size of the mouthpiece mounting member 3, and may be, for example, a plate-shaped member that can be attached to one side 31b or the other side of the main body portion 31 to change the length from one side 31b to the other side of the main body portion 31. Thereby, the size of the main body portion 31 of the mouthpiece mounting member 3 can be changed according to a desired size. Examples of the desired size include sizes corresponding to a desired ridge height, the height expected at the lower end of the opening 311 in the water falling state, the size of the mouthpiece main body 2, the length of the groove 2c, and the like.

[0094] The size-changing member 5 may be attached and used on one side 31b or the other side, or two or more thereof may be used in combination. By using two or more in combination, more flexible size change can be achieved.

[0095] When the main body 31 has fitting portions such as a first fitting portion 31f and a second fitting portion 31g, the size-changing member 5 preferably has at least one of a first fitting portion 5a of the changing member and a second fitting portion 5b of the changing member that can be fitted to these fitting portions. Thereby, water leakage is reduced when the size-changing member 5 is attached to change the size of the main body 31.

[0096] The material of the size-changing member 5 is not particularly limited and may be the same as that of the attachment member 3 for the dropping hopper. The size-changing member 5 may be configured such that the first fitting portion 5a of the changing member and the second fitting portion 5b of the changing member are made of a material with high wear resistance. Examples of such materials include metal materials such as stainless steel.

[0097] <Farmland, etc.> The farmland, etc. where the dropping hopper 1 is installed is not particularly limited, and it may be a field, etc. where any one or more of various crops exemplified by rice, millet, lotus, water chestnut, taro, wasabi, watermelon, spinach, celery, and Dutch rush can be cultivated. The farmland, etc. preferably includes, among others, a paddy field where various crops such as rice can be cultivated in a flooded state. Thereby, the dropping hopper 1 can adjust the water level of the flooded field. Also, the dropping hopper 1 can drain water from the flooded field while adjusting the drainage volume, and can bring the field to a drained state while preventing flooding damage caused by sudden drainage.

[0098] <Examples of using the dropping hopper 1> The following is an explanation of an example of using the dropping hopper 1 in this embodiment. Hereinafter, the case where the farmland, etc. is a paddy field and the crop is rice will be described, but even when the combination of the farmland and the crop is different, by appropriately changing the water level adjustment state and the drained state according to the growth situation and / or weather, etc., various favorable effects brought about by the dropping hopper 1 of this embodiment can be obtained.

[0099] 〔Installation of the drain inlet box body 2〕 When the drain inlet box body 2 is not installed, agricultural workers etc. install the drain inlet box body 2 on the drainage side of farmland etc., and communicate the through hole 2b with the drainage channel.

[0100] 〔Attach the mounting member 3 for the drain inlet box in the water level adjustment state〕 Agricultural workers etc. attach the mounting member 3 for the drain inlet box to the drain inlet box body 2 in a water level adjustment state where the opening 311 is vertically upward through the mounting mechanism such as the groove 2c provided in the drain inlet box body 2 (Fig. 1). At this time, the mounting member 3 for the drain inlet box is attached in a state where the closing member 32 is on the farmland etc. side of the drain inlet box 1. Thereby, the closing member 32 is pressed against the main body portion 31 by the water pressure applied from the farmland etc. side to the main body portion 31 side, and water leakage during water level adjustment is reduced. Thereby, it can be prevented that labor is spent on the work for dealing with water leakage.

[0101] Agricultural workers etc. may cut a part on the side of one side 31b or another part on the side different from the one side 31b of the mounting member 3 for the drain inlet box to change the size according to the desired water level of the paddy field surface etc. in preparation for the water inflow period in spring, and attach the mounting member 3 for the drain inlet box to the drain inlet box body 2. Also, agricultural workers etc. may attach the size changing member 5 in order to perform size change according to the desired water level. In order to facilitate the water volume adjustment by the closing member 32, in these size changes, it is preferable for agricultural workers etc. to make the center of the opening 311 substantially coincide with the desired water level.

[0102] When attaching, it is preferable for agricultural workers etc. to pile up soil only on the lower part not including the vicinity of the opening 311 of the mounting member 3 for the drain inlet box and trample it firmly. Thereby, the outflow of sediment from the opening 311 is prevented, and at the same time, it is prevented that the main body portion 31 moves and the operation becomes unstable. This is because the mounting member 3 for the drain inlet box is pressed against the groove of the drain inlet box body 2 by water pressure and becomes stable.

[0103] [Water level adjustment using the closing member 32] FIG. 4 is a diagram showing an outline of the drop inlet box 1 when adjusting the water level to a level higher than the lower end of the opening 311. The closing member 32 can cooperate with the rotation mechanism 332 to rotate about a fulcrum, so as to block a part of the opening 311 closer to the center 31c of the main body portion 31. That is, in the water level adjustment state, the closing member 32 can block a part of the vertically lower side of the opening 311. Thereby, the agricultural worker can adjust the water level to a height different from the lower end of the opening 311 in the water level adjustment state by a simple operation of rotating the closing member 32. Agricultural workers and the like can rotate the closing member 32 more easily by operating the gripping mechanism 32a using the operating means 4 and the like.

[0104] The drop inlet box mounting member 3 shown in FIG. 4, in which a part above the opening 311 is not blocked by the closing member 32 in the water level adjustment state, is also referred to as the water level adjustment mode. The drop inlet box mounting member 3 in the water level adjustment mode keeps the water level higher than when the shallow water drainage mode is used, thereby preventing the drainage channel from overflowing in the same way as the shallow water drainage mode, suppressing the drainage volume at a time when sediment such as that exemplified by agricultural land etc. immediately after ridging is likely to flow out, and preventing the outflow of sediment from a low position.

[0105] In a situation where sediment outflow is likely to occur, such as when the soil is still soft immediately after ridging, agricultural workers and the like can block a relatively wide area (for example, 80% or more) of the opening 311 with the closing member 32 to minimize sediment outflow. After an appropriate period of about one month has passed and the soil has become firm, agricultural workers and the like can perform an operation so that a wider portion of the opening 311 is not blocked by the closing member 32, thereby suppressing the outflow amount of sediment in the entire water level adjustment process.

[0106] Also, agricultural workers and the like can lock the closing member 32 at a position where the entire opening 311 is blocked using the locking mechanism 331 and adjust the water level at the upper end of the drop inlet box mounting member 3. Crops are cultivated in a flooded state where the agricultural land etc. is filled with water.

[0107] 〔Perform mid-season drainage〕 Agricultural workers etc. perform mid-drying of farmland etc. to a water-drained state as necessary. When starting mid-drying, agricultural workers etc. remove the mounting member 3 for the drain spout in the water level adjustment state from the drain spout body 2, reverse it vertically, and attach it to the drain spout body 2, for example, about one month after rice planting or about one month before heading. Thereby, the mounting member 3 for the drain spout is attached to the drain spout body 2 in a water-drained state where the opening 311 faces vertically downward (Fig. 3).

[0108] The mounting member 3 for the drain spout shown in Fig. 3, where a part below the opening 311 is not blocked by the blocking member 32 in the water-drained state, is also referred to as the deep water-draining mode. The mounting member 3 for the drain spout in the deep water-draining mode can drain water at a low water level from farmland etc. Also, since a part of the opening 311 is blocked, the mounting member 3 for the drain spout in the deep water-draining mode can prevent the drainage channel from overflowing and keep the water level of farmland etc. low, for example, during a period when heavy rain such as after the Bon Festival in rice cultivation is likely to occur.

[0109] At this time, the mounting member 3 for the drain spout is attached with the blocking member 32 on the side of the farmland etc. of the drain spout 1. Thereby, similar to the case of the water level adjustment state, water leakage during drainage is reduced, and it can be prevented that labor is spent on water leakage countermeasure work. Also, since changing to the water-drained state does not involve a complicated operation of transporting members etc. for drainage adjustment one by one from a warehouse etc., the labor related to mid-drying is reduced. Thereby, it can be expected that methane gas emissions from oxygen-deficient soil will be reduced through appropriate implementation of mid-drying. By reducing emissions of methane gas, which is a greenhouse gas, a contribution to achieving the SDGs can be expected.

[0110] In the case of mid-season drainage, it is more preferable to use the shallow drainage mode shown in FIG. 7. In the shallow drainage mode, the water level is kept higher than that in the deep drainage mode shown in FIG. 3. Also, in the shallow drainage mode, the lower position shown in FIG. 4 is not blocked. As a result, the mounting member 3 for the drainage opening of the shallow drainage mode can adjust the water level of agricultural land, etc. to a higher water level than when the deep drainage mode, which is exemplified by, for example, the mid-season drainage period of rice, is used, and a lower water level than when the water level adjustment mode is used. In addition, since the shallow drainage mode is in a state where the lower position is not blocked, even in the case of increased water level exemplified by heavy rain, etc., the amount of drainage by the water flowing through the mounting member 3 for the drainage opening into the drainage channel can be suppressed, and it is possible to prevent the drainage channel from overflowing.

[0111] 〔Perform intermittent irrigation〕 Agricultural workers, etc. perform intermittent irrigation (intermittent watering) that alternates between the flooded state and the drained state in a short period as necessary. Intermittent irrigation is performed, for example, by managing the mounting member 3 for the drainage opening so that the state of the mounting member 3 for the drainage opening is in the water level adjustment state for 1 day and in the drained state for 2 to 3 days alternately during the period of performing intermittent irrigation. In the present embodiment, as described above, the labor when switching between the water level adjustment state and the drained state is reduced. Therefore, the labor of agricultural workers, etc. in intermittent irrigation where the flooded state and the drained state are switched many times is significantly reduced. As a result, it can be expected that methane gas emissions from the oxygen-deficient soil will be reduced through the appropriate implementation of intermittent irrigation. Therefore, the mounting member 3 for the drainage opening of the present embodiment contributes to the suppression of greenhouse gases.

[0112] 〔Perform water level adjustment at a low water level〕 After agricultural workers, etc. operate the blocking member 32 to make it in the fully open state where the opening 311 is not blocked, the mounting member 3 for the drainage opening is attached to the drainage opening main body 2 in the water level adjustment state. As a result, the water level of agricultural land, etc. is adjusted to a low water level.

[0113] 〔Perform water level adjustment at a high water level〕 After agricultural workers etc. lock the closing member 32 at the closed position where the entire opening 311 is blocked by the locking mechanism 331, they attach the attachment member 3 for the drop inlet box to the drop inlet box body 2 in the water level adjustment state. Thereby, the water level of agricultural land etc. is adjusted to a high water level.

[0114] Also, after locking the closing member 32 as described above, in the drop inlet box body 2 to which the attachment member 3 for the drop inlet box is attached, by blocking the opening formed vertically above the drop inlet box body 2 and between the attachment member 3 for the drop inlet box and the drop inlet box body 2 with a plate and / or a mound of soil etc., the water level of agricultural land etc. can be adjusted to an even higher water level.

[0115] 〔Perform drainage volume adjustment during heavy rain〕 When heavy rain occurs due to typhoons, guerrilla heavy rain, guerrilla thunderstorms etc., agricultural workers etc. use the slide mechanism 33 to adjust the area of the opening 311 and attach the attachment member 3 for the drop inlet box to the drop inlet box body 2 in the water discharge state. Thereby, while preventing waterlogging damage caused by drainage from agricultural land etc. in the surrounding and / or downstream areas, drainage from agricultural land etc. can be performed. That is, a paddy field dam is realized.

[0116] Figure 5 is a diagram showing an outline of the drop inlet box 1 when reducing the drainage volume and causing water to fall. Contrary to the water level adjustment state, in the water discharge state, the closing member 32 can block a part on the vertically upper side of the opening 311. Thereby, the attachment member 3 for the drop inlet box can achieve both adjusting the drainage volume in the water discharge state by a simple operation of rotating the closing member 32 and continuing drainage even at a water level as low as around the lower end of the opening 311.

[0117] By the way, when the rice paddy dam is realized by different members for water level adjustment and drainage volume adjustment, since the members for the rice paddy dam are carried out one by one from a warehouse or the like, the work becomes complicated and the work time can become long. Therefore, if the work time is insufficient due to suddenly increased rainfall or the like, there is a concern that the rice paddy dam cannot be realized at all drainage points in a wide agricultural land or the like. In addition, there is a concern that the removed members for water level adjustment are unavoidably left around the drainage points without being stored in a warehouse or the like due to insufficient work time, and are damaged or lost during heavy rain.

[0118] In this embodiment, since the water level adjustment and the drainage volume adjustment can be performed by one mounting member 3 for the dropping box, even in a situation where the work time is limited such as during sudden heavy rain, the members for the rice paddy dam can be realized in a relatively short time and with less labor without carrying out the members for the rice paddy dam one by one from a warehouse or the like and without leaving the removed members for water level adjustment.

[0119] 〔Perform water drainage〕 Agricultural workers, etc., for example, put the mounting member 3 for the dropping box in a water-dropping state at about 30 days after heading and about 10 days before rice harvesting. As a result, water drainage is performed, the rice dries, and the ripening is completed. In addition, due to the water drainage, the soil is dried, the running performance of the combine harvester is stabilized, and the rice harvesting work is smoothly performed.

[0120] 〔Take flood control measures during the snowmelt period〕 In winter, agricultural workers, etc., attach the mounting member 3 for the dropping box to the dropping box main body 2 in the above-described shallow water-dropping mode or deep water-dropping mode, that is, the rice paddy dam mode. As a result, it is possible to drain water from agricultural land or the like while preventing waterlogging damage due to drainage from agricultural land or the like in the vicinity and / or downstream due to a sudden increase in water level during the snowmelt period. That is, flood control measures during the snowmelt period are realized.

[0121] As described above, an example of a preferred embodiment of the present invention has been explained. It should be noted that within the scope of the idea of the present invention, those skilled in the art can conceive of various modification examples and correction examples, and it is understood that those modification examples and correction examples also belong to the scope of the present invention. For example, with respect to the above-described embodiment, those obtained by appropriately adding, deleting, or changing the design of components by those skilled in the art, or those obtained by adding, omitting, or changing conditions of steps, are also included in the scope of the present invention as long as they have the gist of the present invention.

Explanation of Signs

[0122] 1 Hopper 2 Hopper body 2a Through surface 2b Through hole 2c Groove 3 Mounting member for hopper 31 Main body part 31a First opening surface 31b One side 31c Center of the main body part 31d One end 31e The other end 31f First fitting part 31g Second fitting part 311 Opening 32 Closing member 32a Gripping mechanism 33 Slide mechanism 331 Locking mechanism 332 Rotating mechanism 333 Anti-movement mechanism 4 Operating means 41 Operating means main body 41a Center 42b One end 42c The other end 42 Gripping hole 5 Size-changing member 5a First fitting part of the changing member 5b Second fitting part of the changing member P Predetermined part

Claims

1. A mounting member for a drain inlet box, which is installed on the drainage side of a paddy field or farmland, is detachable in a direction substantially parallel or inclined to a through surface having a through hole communicating with a drainage channel, via a groove formed on an inner surface of a side plate of the drain inlet box having the through surface, and includes a main body portion having an opening surface including an opening; a closing member that can be installed substantially parallel to the opening surface and can block part or all of the opening; a rotation mechanism that can rotate the closing member about a fulcrum, which is a point on the outer periphery of the closing member when the closing member blocks the opening and is located closer to the center of the main body portion than the center of the opening; and is provided with; The opening is; located on one side with respect to the center of the main body portion; By attaching it to the drain inlet box so that the one side of the main body portion is located vertically above, a water level adjustment state can be achieved, and by attaching it to the drain inlet box so that the one side of the main body portion is located vertically below, a water falling state can be achieved; The rotation mechanism is; includes a lock nut that generates a preloading torque between a nut and a bolt; In the water level adjustment state, the closing member is configured to be substantially fixable in a shallow water falling mode that does not block a predetermined portion provided away from the one side from the fulcrum in the opening; Mounting member for drain inlet box.

2. The mounting member for a drain inlet box according to claim 1, wherein the lock nut includes a lock nut that generates a preloading torque between a nut and a bolt.

3. A drain inlet box, comprising a drain inlet box main body installed on the drainage side of a paddy field or farmland and having a through surface including a through hole communicating with a drainage channel, and the mounting member for a drain inlet box according to claim 1 or 2. Drain inlet box.

Images