Weir plate, method for installing weir plate, and installation structure of weir plate

Abstract

To provide a weir plate that can be installed in waterways of various widths.SOLUTION: The present invention pertains to a weir plate 10 installed in a drainage basin 100 having a first direction as a flow path direction and a second direction orthogonal to the first direction as a width direction. A first dividing plate 20 having a plate shape having a first opposing surface and a second dividing plate 40 having a second opposing surface facing the first opposing surface in the first direction are provided. The first opposing surface is provided with convex portions 31 and 32 that protrude toward opposite sides in the first direction and extend in the second direction. The second opposing surface is provided with a recessed portion that extends in the second direction and is engageable with the convex portions 31 and 32. The first dividing plate 20 and the second dividing plate 40 are movable relative to each other in the second direction by sliding the outer surfaces of the convex portions 31 and 32 and the inner surfaces of the recessed portions.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a weir plate installed in a water channel of agricultural land such as paddy fields, and a method for installing the weir plate.

Background Art

[0002] Conventionally, a drainage tub has been provided in the water conduction path of a paddy field. When storing water in the paddy field, the outflow of water is suppressed by attaching a wooden board to the drainage tub. When draining water from the paddy field, the wooden board attached to the drainage tub is removed. When attaching a wooden board to the drainage tub in this way, it is necessary to prepare a plurality of wooden boards with different heights to adjust the water level of the paddy field, and fine adjustment of the water level is difficult.

[0003] As a weir plate that solves such problems, there is a weir plate described in Patent Document 1. Since the height of the weir plate described in Patent Document 1 is variable, the water level of the water channel can be adjusted without providing a plurality of weir plates or using members other than the weir plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the weir plate described in Patent Document 1, although the water level can be adjusted by making the height variable, when the width of the drainage tub is larger than the weir plate, the weir plate cannot be attached to the drainage tub. When the width of the drainage tub is smaller than the weir plate, it is necessary to cut the weir plate to narrow the width. Therefore, it is necessary to prepare a plurality of weir plates according to the width of the drainage tub. Even if a plurality of weir plates with different widths are prepared, if a drainage tub with a width that does not match the width is installed, it is still impossible to attach the weir plate, or it is necessary to cut the weir plate.

[0006] The present invention has been made to solve the above problems, and its main object is to provide a weir plate that can be installed in water channels of various widths.

Means for Solving the Problems

[0007] A first configuration is a weir plate installed in a water channel with the first direction as the flow path direction and the second direction orthogonal to the first direction as the width direction, comprising a plate-shaped first dividing plate having a first opposing surface, and a second dividing plate having a second opposing surface that opposes the first opposing surface in the first direction. A convex portion that protrudes toward the opposing side in the first direction and extends in the second direction is provided on the first opposing surface, and a concave portion that extends in the second direction and can engage with the convex portion is provided on the second opposing surface. The first dividing plate and the second dividing plate are relatively movable in the second direction by sliding of the outer surface of the convex portion and the inner surface of the concave portion.

[0008] In the first configuration, the width of the entire weir plate can be changed by relatively moving the first dividing plate and the second dividing plate in the second direction, and the weir plate can be installed in water channels of various widths. Also, since the first dividing plate and the second dividing plate are engaged so as to slide, if muddy water flowing through the water channel flows in, sand and mud will enter between the convex portion and the concave portion, and the relative movement will be inhibited by the sand and mud. Therefore, when the weir plate is installed in the water channel, the relative movement is inhibited by sand and mud, and fluctuations in the relative positions of the first dividing plate and the second dividing plate can be suppressed. In addition, since the first dividing plate and the second dividing plate are not merely in contact but are slidable by the convex portion and the concave portion, there are more gaps for sand and mud to enter, and the suppression effect of relative movement by sand and mud can be further improved. Also, if the sand and mud caught between the concave portion and the convex portion are washed away when the weir plate is removed, the first dividing plate and the second dividing plate can slide again and can be reused. Furthermore, since the first dividing plate and the second dividing plate have unevenness, the overall weight can be reduced while maintaining the strength compared to the case of a flat plate.

[0009] In addition to the first configuration, in the second configuration, the convex portion stands upright toward the opposing side in the first direction, and is composed of a first side surface portion extending in the second direction and a tip surface portion provided at the tip on the first direction side and extending in the second direction. The concave portion stands upright toward the opposing side in the first direction and extends in the second direction, and is composed of a second side surface portion slidable with respect to the first side surface portion and a bottom surface located on the inner side of the opposing side and extending in the second direction and slidable with respect to the tip surface portion.

[0010] In the second configuration, since the side surfaces of the convex portion and the concave portion slide against each other, and the tip surface of the convex portion and the bottom surface of the concave portion slide, there are more places where sand and mud can get stuck, and the inhibitory effect of relative movement due to sand and mud can be made greater.

[0011] In addition to the first or second configuration, in the third configuration, the first opposing surface can be installed facing the upstream side of the water channel.

[0012] In the third configuration, when sediment accumulates in the water channel, the sediment also accumulates on the upper side of the convex portion, so the weight of the accumulated sediment can suppress the weir plate from coming out of the water channel.

[0013] In addition to any of the first to third configurations, in the fourth configuration, the concave portion has an end on the second direction side that is open to the outside.

[0014] In the fourth configuration, sand and soil can more easily enter the concave portion, and the sand and soil that enter the concave portion get stuck between the convex portion and the concave portion, so the inhibitory effect of relative movement between the first partition plate and the second partition plate due to sand and soil can be obtained earlier.

[0015] In addition to any of the first to fourth configurations, in the fifth configuration, another partition plate facing the first partition plate and the second partition plate in the first direction is further provided, and the another partition plate is movable relative to the first partition plate and the second partition plate in a third direction orthogonal to the first direction and the second direction.

[0016] In the fifth configuration, since the height of the weir plate can be changed by relatively moving another dividing plate, the water level of the water channel can be finely adjusted using the weir plate.

[0017] In the sixth configuration, in addition to any of the first to fifth configurations, a plurality of weir plates can be stacked in a direction orthogonal to the one direction and the second direction.

[0018] In the sixth configuration, since the overall height of the weir plate can be changed by stacking the weir plates, the water level of the water channel can be adjusted using the weir plate.

[0019] In the seventh configuration, in addition to any of the first to sixth configurations, a mounting portion on which a member capable of adjusting the water level can be mounted is provided in a direction orthogonal to the one direction and the second direction.

[0020] In the seventh configuration, the water level of the water channel can be finely adjusted using a member capable of adjusting the water level prepared separately from the weir plate.

[0021] The eighth configuration is a method of installing a weir plate composed of a plurality of dividing plates in a water channel. The dividing plate is provided with a slide mechanism capable of relatively moving in the width direction of the water channel to change the widths of both ends of the weir plate. The dividing plates are relatively moved so that the width of the weir plate is the width across the water channel, and the weir plate is arranged in the water channel. At least a part of the surface of the weir plate facing the upstream direction is buried by sediment contained in the water flowing through the water channel, and the relative movement of the dividing plates by the slide mechanism is suppressed by the sediment that has entered the slide mechanism to maintain the width of the weir plate.

[0022] In the eighth configuration, the weir plate of any of the first to seventh configurations can be suitably installed in the water channel.

Brief Description of the Drawings

[0023]

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Mode for Carrying Out the Invention

[0024] <First Embodiment> As shown in FIG. 1, the weir plate 10 according to the embodiment is attached to and used for a drain pan 100 provided in a water channel of a paddy field. In the following description, the vertical direction is the up-and-down direction, the paddy field side of the water channel is the front direction, and the width direction of the water channel is the left-and-right direction. Further, each member is formed of a hard resin.

[0025] First, the structure of the drain pan 100 will be described with reference to FIG. 2. This drain pan 100 is integrally formed of concrete. The drain pan 100 includes a bottom plate 101 which is a rectangular flat plate extending in the front-rear direction. A bottom groove 102 extending in the left-and-right direction is formed at a position slightly closer to the rear end in the front-rear direction of this bottom plate 101, parallel to the front and rear ends. On each of the left and right ends of this bottom plate 101, flat side walls 103 and 104 which stand upright upward and have a substantially uniform thickness in the left-and-right direction are provided facing each other. These side walls 103 and 104 have the same shape, and the height of the front end is lower than the height of the rear end, and the height gradually decreases from the rear end toward the front end. On each inner surface of these side walls 103 and 104, side wall grooves 105 and 106 which are grooves extending upward are respectively provided at the same position in the front-rear direction where the bottom groove 102 is provided.

[0026] At the rear ends of the bottom plate 101 and the side walls 103 and 104, there is provided a flat rear wall 107 which stands upright upward and has a uniform thickness in the front-rear direction. Near the lower end of this rear wall 107, there is provided a circular discharge hole 108 which penetrates in the front-rear direction. The center of this discharge hole 108 substantially coincides with the center in the left-right direction of the rear wall, and the diameter of the discharge hole 108 is approximately half of the width of the rear wall 107.

[0027] As shown in FIGS. 3 to 5, the weir plate 10 installed in the drainage trough 100 described above includes a first dividing plate 20 and a second dividing plate 40, the overall shape of which is a substantially rectangular plate. First, the structure of the first dividing plate 20 will be described with reference to FIGS. 6 to 8. The first dividing plate 20 includes a first bottom plate portion 21 which is a rectangular plate having the vertical direction as the short side, the horizontal direction as the long side, and a constant thickness in the front-rear direction. At the left end of the first bottom plate portion 21, there is provided a left side wall portion 22 which bulges forward. The vertical width of the left side wall portion 22 is equal to and constant with that of the first bottom plate portion 21, the horizontal width is constant in the vertical direction and smaller than the vertical width, and the front-rear thickness is substantially constant. In the left side wall portion 22, there is provided a left side wall recess 23 which is recessed from the front to the rear. The left side wall recess 23 is rectangular and extends in the vertical direction in a front view, and the thickness around the left side wall recess 23 is substantially uniform.

[0028] At the upper end of the first bottom plate portion 21, there is provided an upper end wall portion 24 that extends horizontally in the left-right direction and protrudes forward. The left end of this upper end wall portion 24 is in contact with the left side wall portion 22, and the right end is provided up to the right end of the first bottom plate portion 21. The amount of forward protrusion of the upper end wall portion 24 is less than the amount of protrusion of the left side wall portion 22, and the vertical width of the upper end wall portion 24 is substantially uniform. Near the right end of this upper end wall portion 24, there is provided a first upper engaging portion 25 that protrudes downward. This first upper engaging portion 25 is provided on the front end side of the upper end wall portion 24, and a gap is provided between the first upper engaging portion 25 and the first bottom plate portion 21. The amount of downward protrusion of the first upper engaging portion 25 is substantially uniform in the left-right direction, and the amount of protrusion is substantially equal to the vertical width of the upper end wall portion 24, and the front-rear thickness is also substantially uniform. Also, at a position of the first bottom plate portion 21 facing the back surface of the first upper engaging portion 25, there is provided an upper opening 26 that penetrates in the front-rear direction and has substantially the same shape as the first upper engaging portion 25.

[0029] At the lower end of the first bottom plate portion 21, there is provided a lower end wall portion 27 that extends horizontally in the left-right direction and protrudes forward. The shape of this lower end wall portion 27 is vertically symmetric with the upper end wall portion 24. Similar to the upper end wall portion 24, near the right end of the lower end wall portion 27, there is provided a first lower engaging portion 28 that protrudes upward. Also, at a position of the first bottom plate portion 21 facing the back surface of the first lower engaging portion 28, there is provided a lower opening 29 that penetrates in the front-rear direction and has substantially the same shape as the first lower engaging portion 28.

[0030] On the front side of the first bottom plate portion 21, slightly above the center in the vertical direction, a first convex portion 31 that extends horizontally in the left-right direction and protrudes forward is provided. The left end of this first convex portion 31 is in contact with the left side wall portion 22, and the right end is provided up to the right end of the first bottom plate portion 21. Similarly, slightly below the center in the vertical direction of the first bottom plate portion 21, a second convex portion 32 having the same shape as the first convex portion 31 is provided. The forward protrusion amounts of these first convex portion 31 and second convex portion 32 are equal to the protrusion amounts of the upper end wall portion 24 and the lower end wall portion 27, and the upper and lower thicknesses of the first convex portion 31 and the second convex portion 32 are substantially uniform. The right ends of the first convex portion 31 and the second convex portion 32 are connected by a right wall 33 that extends vertically in the up-down direction and protrudes forward. The forward protrusion amount of this right wall 33 is equal to the protrusion amounts of the first convex portion 31 and the second convex portion 32, and the left-right width of the right wall 33 is equal to the up-down widths of the first convex portion 31 and the second convex portion 32.

[0031] Subsequently, the configuration of the second partition plate 40 will be described with reference to FIGS. 9 to 11. The second partition plate 40 includes a second bottom plate portion 41 that is rectangular plate-shaped with the vertical direction as the short side, the horizontal direction as the long side, and has a certain thickness in the front-rear direction. The up-down width, left-right width, and front-rear thickness of the second bottom plate portion 41 are equal to those of the first bottom plate portion 21. At the right end of this second bottom plate portion 41, a right side wall portion 42 that bulges rearward is provided. The shape of this right side wall portion 42 is substantially the same as that of the left side wall portion 22 of the first partition plate. Similarly to the left side wall recess 23 provided in the left side wall portion 22, a right side wall recess 43 that is recessed from the rear to the front is provided.

[0032] On the back side of the second bottom plate portion 41, slightly below the upper end, there is an upper raised portion 44 that extends in the left-right direction, is substantially rectangular in shape, and bulges rearward. The right end of this upper raised portion 44 is in contact with the right side wall portion 42, and the left end is provided up to the left end of the second bottom plate portion 41. Also, the upper raised portion 44 protrudes substantially uniformly forward, and the amount of protrusion is substantially equal to the amount of protrusion of the upper end wall portion 24 of the first dividing plate 20 and the like. The distance from the upper end of the second bottom plate portion 41 to the upper end of the upper raised portion 44 is substantially equal to the distance from the upper end of the first bottom plate portion 21 to the first upper engaging portion 25 in the first dividing plate 20. Also, the height from the upper end of the second bottom plate portion 41 to the lower end of the upper raised portion 44 is substantially equal to the height from the upper end of the first bottom plate portion 21 to the upper end of the first convex portion 31 in the first dividing plate 20.

[0033] Over the entire rear edge of this upper raised portion 44, a second upper engaging portion 45 that projects upward is provided. The height from the upper surface of the upper raised portion 44 to the upper end of the second upper engaging portion 45 is equal to the height from the lower surface of the upper end wall portion 24 to the lower end of the first upper engaging portion 25 in the first dividing plate 20 and is substantially uniform. A gap is provided between the front surface of this second upper engaging portion 45 and the back surface of the second bottom plate portion 41, and the front-rear width of the gap is substantially equal to the front-rear width of the first upper engaging portion 25 provided on the upper end wall portion 24 of the first dividing plate 20. Also, the front-rear width of the second upper engaging portion 45 is substantially equal to the distance between the first bottom plate portion 21 and the first upper engaging portion 25 in the first dividing plate 20.

[0034] Slightly above the lower end of the second bottom plate portion 41, a lower raised portion 46 having a shape symmetrical to the upper raised portion 44 in the vertical direction is provided. At the rear edge of this lower raised portion 46, a second lower engaging portion 47 that projects downward is provided in the same manner as the upper raised portion 44.

[0035] Since the upper raised portion 44 and the lower raised portion 46 are provided as described above, the region surrounded by the lower surface of the upper raised portion 44, the upper surface of the lower raised portion 46, the left side surface of the right side wall portion 42, and the back surface of the second bottom plate portion 41 can be referred to as a concave portion 51 that is recessed from the back side toward the front side. The vertical width of this concave portion 51 is substantially equal to the width from the upper surface of the first convex portion 31 to the lower surface of the second convex portion 32, and it can be said that the left end of the concave portion 51 is open. Further, at the upper end on the front side of the second bottom plate portion 41, a mounting portion 52 that protrudes toward the front and extends in the left-right direction is provided. The upper end of this mounting portion 52 forms a flat surface together with the upper end of the second bottom plate portion 41.

[0036] When attaching the weir plate 10 composed of the first dividing plate 20 and the second dividing plate 40 described above to the drain pan 100, first, the first dividing plate 20 and the second dividing plate 40 are combined to form one weir plate 10 shown in FIGS. 3 to 5. Specifically, after fitting the first upper engaging portion 25 and the first lower engaging portion 28 of the first dividing plate 20 between the second upper engaging portion 45 and the second lower engaging portion 47 of the second dividing plate 40, it is slid in the left-right direction. At this time, since the front surface of the first bottom plate portion 21 of the first dividing plate 20 faces the back surface of the second bottom plate portion 41 of the second dividing plate 40, the front surface of the first bottom plate portion 21 can be referred to as the first opposing surface, and the back surface of the second bottom plate portion 41 can be referred to as the second opposing surface. At this time, the first dividing plate 20 and the second dividing plate 40 are assembled so as to suppress the separation in the front-rear direction (the separation between the first opposing surface and the second opposing surface) of the first dividing plate 20 and the second dividing plate 40 by the first upper engaging portion 25, the first lower engaging portion 28, the second upper engaging portion 45, and the second lower engaging portion 47.

[0037] The upper surface of the first convex portion 31 of the first partition plate 20 abuts against the lower surface of the upper raised portion 44 of the second partition plate 40, and the front surface of the first convex portion 31 abuts against the rear surface of the second bottom plate portion 41. Similarly, the lower surface of the second convex portion 32 of the first partition plate 20 abuts against the upper surface of the lower raised portion 46 of the second partition plate 40, and the front surface of the second convex portion 32 abuts against the rear surface of the second bottom plate portion 41. That is to say, the first convex portion 31 and the second convex portion 32 of the first partition plate 20 are in contact with the concave portion 51 of the second partition plate 40. At this time, if the upper side surface of the first convex portion 31 and the lower side surface of the second convex portion 32 are combined to form a first side surface portion extending in the left-right direction, it can be said that the first side surface portion is in contact with the second side surface portion which is the upper side surface and the lower side surface of the concave portion 51. Also, if the front surfaces of the first convex portion 31 and the second convex portion 32 are referred to as the tip surfaces, and the inner side surface on the side facing the first partition plate 20 in the second concave portion 52 is referred to as the bottom surface, it can be said that the tip surface and the bottom surface are in contact. In addition, since the right end of the concave portion 51 is blocked by the left side surface of the right side wall portion 42 and the left end of the concave portion 51 is open, the left side which is the side facing the first partition plate 20 in the left-right direction of the concave portion 51 is open, and it can be said that the right side which is the opposite side of the side facing the first partition plate 20 is blocked.

[0038] In the above state, if the first partition plate 20 and the second partition plate 40 are relatively slid in the left-right direction, the first convex portion 31 and the second convex portion 32 slide while being in contact with the concave portion 51. When relatively sliding the first partition plate 20 and the second partition plate 40, the left side wall recess 23 of the first partition plate 20 and the right side wall recess 43 of the second partition plate 40 are used as finger-hooking portions for hooking fingers to operate. At this time, the first side surface portion of the first convex portion 31 and the second convex portion 32 and the second side surface portion of the concave portion 51 slide while being in contact, and the tip surface of the first convex portion 31 and the second convex portion 32 and the bottom surface of the concave portion 51 slide while being in contact. Incidentally, the first convex portion 31, the second convex portion 32, and the concave portion 51 can also be collectively referred to as a sliding mechanism.

[0039] Further, the first upper engagement portion 25 and the second upper engagement portion 45, and the first lower engagement portion 28 and the second lower engagement portion 47 also slide while being in contact with each other. At this time, the region formed by the front surface of the second upper engagement portion 45, the upper surface of the upper raised portion 44, and the front surface of the second bottom plate portion 41 can be referred to as a recess that extends in the left-right direction and is recessed from top to bottom. The first upper engagement portion 25 can be referred to as a convex portion that extends in the left-right direction and protrudes downward. It can be said that these convex and concave portions slide while being in contact with each other. Similarly, the region formed by the front surface of the second lower engagement portion 47, the upper surface of the lower raised portion 46, and the front surface of the second bottom plate portion 41 can also be referred to as a recess that extends in the left-right direction and is recessed from bottom to top. The first lower engagement portion 28 can be referred to as a convex portion that extends in the left-right direction and protrudes upward. It can be said that these convex and concave portions slide while being in contact with each other. In addition, the first upper engagement portion 25, the first lower engagement portion 28, the second upper engagement portion 45, and the second lower engagement portion 47 can also be collectively referred to as a slide mechanism. Further, with respect to these first upper engagement portion 25, first lower engagement portion 28, second upper engagement portion 45, and second lower engagement portion 47, since they assemble the first partition plate 20 and the second partition plate 40 while suppressing the separation in the front-rear direction between the first partition plate 20 and the second partition plate 40, they can also be collectively referred to as an assembly mechanism.

[0040] When attaching the weir plate 10 to the drain pan 100, the width of the entire weir plate 10 formed by combining the first partition plate 20 and the second partition plate 40 is made substantially equal to the interval between the side wall grooves 105 and 106 of the drain pan 100, and then the weir plate 10 is inserted into the side wall grooves 105 and 106 from above to attach the weir plate 10 to the drain pan 100. At this time, the number of weir plates 10 used is changed according to the required water level. In FIG. 1, an example of using three weir plates 10 is shown. However, when setting a lower water level, the number of weir plates 10 may be one or two, and when setting a higher water level, four or more weir plates 10 may be used. Further, since a placement portion 52 is provided at the upper end of the second partition plate 40, another water level adjustment member may be placed on the weir plate 20 by utilizing the placement portion 52, and the water level may be adjusted by the water level adjustment member.

[0041] If the weir plate 10 is installed on the drain box 100 as described above, the water flowing from the water channel of the paddy field into the drain box 100 is blocked by the weir plate 10. Since the water flowing from the paddy field into the drain box 100 contains sand and mud, sand and mud accumulate in front of the weir plate 10, and a part of the sand and mud penetrates between the first partition plate 20 and the second partition plate 40. At this time, the sand and mud are fitted between the first convex portions 31 and 32 of the first partition plate 20 and the concave portion 51 of the second partition plate 40. Similarly, sand and mud are also fitted between the first upper engaging portion 25 and the second upper engaging portion 45, and between the first lower engaging portion 28 and the second lower engaging portion 47. The soil and sand thus fitted engage with each other between the first partition plate 20 and the second partition plate 40 to generate friction, and the relative movement of the first partition plate 20 and the second partition plate 40 in the left-right direction is suppressed. Further, when the weir plate 10 is removed, by washing the weir plate 10 with water or the like, the sand and mud engaged between the first partition plate 20 and the second partition plate 40 are washed away, and the width of the weir plate 10 can be changed and it can be reused.

[0042] With the above configuration, the weir plate 10 according to the present embodiment has the following effects.

[0043] · Just by installing the weir plate 10 on the drain box 100, the relative movement between the first partition plate 20 and the second partition plate 40 can be suppressed by the sand and mud contained in the inflowing water. Therefore, it is possible to install and fix the width of the weir plate 10 in accordance with the width of the drain box 100.

[0044] · Since the first partition plate 20 and the second partition plate 40 are not simply in contact with each other but are slidable by the convex portions 31, 32 and the concave portion 51, there are more gaps for sand and mud to enter, and the suppression effect of relative movement by sand and mud can be further improved.

[0045] · Since the first partition plate 20 has the convex portions 31, 32 and the second partition plate 40 has the concave portion 51, it is possible to maintain the strength while reducing the overall weight compared to the case of a flat plate.

[0046] · Since the sides of the convex portions 31 and 32 and the concave portion 51 slide against each other, and the tip surfaces of the convex portions 31 and 32 and the bottom surface of the concave portion 51 slide, there are more places where sand and mud can get stuck, and the inhibitory effect of relative movement by sand and mud can be made greater.

[0047] · By installing the front surface of the first weir plate 20 so as to face the water flow, the sediment deposited in the drain trough 100 also accumulates on the upper side of the convex portions 31 and 32, and the weight of the accumulated sediment can suppress the detachment of the weir plate 10 from the drain trough 100.

[0048] · Since the left end of the concave portion 51 is open, sand and soil can easily enter the inside of the concave portion 51, and the sand and soil that enter the inside of the concave portion 51 get stuck between the convex portions 31 and 32, so that the inhibitory effect of relative movement between the first partition plate 20 and the second partition plate 40 by sand and soil can be obtained earlier.

[0049] · Since the overall height can be changed by stacking a plurality of weir plates 10 vertically, the water level of the water channel can be adjusted using the weir plates 10.

[0050] <Second Embodiment> The weir plate 200 according to the present embodiment is used by being attached to the drain trough 100 in the same manner as the weir plate 10 according to the first embodiment. As shown in FIGS. 12 and 13, the weir plate 200 is composed of a first partition plate 210 arranged at the upper left, a second partition plate 230 arranged at the upper right, a third weir plate 250 arranged at the lower left, and a fourth weir plate 270 arranged at the lower right when viewed from the front. Note that the weir plate 200 according to the present embodiment is formed of a hard resin, similar to the first embodiment.

[0051] First, the structure of the first dividing plate 210 will be described with reference to FIGS. 18-20. The first dividing plate 210 includes a first bottom plate portion 211 that is rectangular plate-shaped with the vertical direction as the short side, the horizontal direction as the long side, and has a certain thickness in the front-rear direction. Near the left end of this first bottom plate portion 211, a first left side wall portion 212 that bulges forward is provided, and at the left end of the first bottom plate portion 211, a flat plate-shaped first left side engaging portion 213 that extends vertically is provided.

[0052] At the upper end of the first bottom plate portion 211, a first upper side wall portion 214 that extends horizontally in the left-right direction and protrudes forward is provided, and near the right end of this first upper side wall portion 214, a first upper side engaging portion 215 that protrudes downward is provided. Also, at the lower end of the first bottom plate portion 211, a first lower side wall portion 216 that extends horizontally in the left-right direction and protrudes forward is provided, and near the right end of this first lower side wall portion 216, a first lower side engaging portion 217 that protrudes upward is provided. The specific shapes of these first upper side wall portion 214, first upper side engaging portion 215, first lower side wall portion 216, and first lower side engaging portion 217 are equivalent to the upper end wall portion 24, first upper side engaging portion 25, lower end wall portion 27, and first lower side engaging portion 28 in the first embodiment. Further, on the back surface of the first bottom plate portion 211, a handle 218 that extends horizontally in the left-right direction and protrudes rearward is provided.

[0053] On the front side of the first bottom plate portion 211, a first upper side convex portion 221 is provided, which is composed of a pair of convex portions that extend horizontally in the left-right direction and protrude forward, and a convex portion that protrudes forward so as to connect the right ends of the convex portions. Below this first upper side convex portion 221, a first central convex portion 222 having the same shape as the first upper side convex portion 221 is provided at an interval, and below the first central convex portion 222, a first lower side convex portion 223 having the same shape as the first upper side convex portion 221 is provided at an interval. The amount of forward protrusion of the first upper side convex portion 221, first central convex portion 222, and first lower side convex portion 223 is equal to that of the first upper side wall portion 214, etc., and the interval between the first upper side convex portion 221 and the first central convex portion 222, and the interval between the first central convex portion 222 and the first lower side convex portion 223 are equal.

[0054] The region surrounded by the lower ends of these first upper convex portions 221, the upper ends of the first central convex portions 222, the right ends of the first left side wall portions 212, and the front surface of the first bottom plate portion 211 can be referred to as a first upper concave portion 224 that is recessed from the front surface toward the back surface. Also, the region surrounded by the lower ends of the first central convex portions 222, the upper ends of the first lower convex portions 223, the right ends of the first left side wall portions 212, and the front surface of the first bottom plate portion 211 can be referred to as a first lower concave portion 225 that is recessed from the front surface toward the back surface.

[0055] Subsequently, the structure of the second partition plate 230 will be described with reference to FIGS. 21-23. The second partition plate 230 includes a second bottom plate portion 231 that is rectangular plate-shaped with the vertical direction as the short side, the horizontal direction as the long side, and having a certain thickness in the front-rear direction. The vertical width, horizontal width, and front-rear thickness of the second bottom plate portion 231 are equal to those of the first bottom plate portion 211. Near the right end of this second bottom plate portion 231, a second right side wall portion 232 that bulges rearward is provided, and at the left end of the second bottom plate portion 231, a flat plate-shaped second right engagement portion 233 that extends vertically is provided.

[0056] Slightly below the upper end on the back side of the second bottom plate portion 231, a second upper side wall portion 234 that extends horizontally in the left-right direction and protrudes rearward is provided, and at the upper end of this second upper side wall portion 234, a second upper engagement portion 235 that extends in the left-right direction and protrudes upward is provided. Also, slightly above the lower end of the second bottom plate portion 231, a second lower side wall portion 236 that extends horizontally in the left-right direction and protrudes rearward is provided, and at the lower end of this second lower side wall portion 236, a second lower engagement portion 237 that extends in the left-right direction and protrudes upward is provided. The shapes of the second upper engagement portion 235 and the second lower engagement portion 237 are equivalent to the shapes of the second upper engagement portion 45 and the second lower engagement portion 47 in the first embodiment. Also, the amount of protrusion rearward of the second upper side wall portion 234 and the second lower side wall portion 236 is equal to the amount of protrusion forward of the first upper side wall portion 214, etc. in the first partition plate 210.

[0057] On the back side of the second bottom plate portion 231, below the second upper side wall portion 234, there is provided a second upper convex portion 241 which is composed of a pair of convex portions horizontally extending in the left - right direction and protruding rearward, and a convex portion protruding rearward so as to connect the left ends of the convex portions. Below the second upper convex portion 241 and above the lower side wall portion 236, second lower convex portions 242 having the same shape as the second upper convex portion 241 are provided at intervals. The widths of the upper and lower ends of these second upper convex portions 241 and second lower convex portions 242 are equal to the vertical widths of the first upper concave portion 224 of the first dividing plate 210, etc., and the forward protruding amounts of the second upper convex portions 241 and second lower convex portions 242 are equal to the protruding amounts of the second upper side wall portion 234, etc. Also, the intervals between the second upper side wall portion 234 and the second upper convex portion 241, between the second upper convex portion 241 and the second lower convex portion 242, and between the second lower convex portion 242 and the second lower side wall portion 236 are equal, and that interval is equal to the width of the upper and lower ends of the first upper convex portion 221 of the first dividing plate 210.

[0058] The region surrounded by the lower end of the second upper side wall portion 234, the upper end of the second upper convex portion 241, the left end of the second right side wall portion 232, and the front surface of the second bottom plate portion 231 can be referred to as a second upper concave portion 243 that is recessed from the back surface toward the front surface. Similarly, the region surrounded by the lower end of the second upper convex portion 241, the upper end of the second lower convex portion 242, the left end of the second right side wall portion 232, and the front surface of the second bottom plate portion 231 can be referred to as a second central concave portion 244 that is recessed from the back surface toward the front surface, and the region surrounded by the lower end of the second lower convex portion 242, the upper end of the second lower side wall portion 236, the left end of the second right side wall portion 232, and the front surface of the second bottom plate portion 231 can be referred to as a second lower concave portion 245 that is recessed from the back surface toward the front surface.

[0059] Next, the structure of the third weir plate 250 will be described with reference to FIGS. 24 to 26. The third weir plate 250 includes a third bottom plate portion 251 that is rectangular plate-shaped with the vertical direction as the short side, the horizontal direction as the long side, and has a constant thickness in the front-rear direction. Near the left end of the third bottom plate portion 251, a third left side wall portion 252 that bulges forward is provided, and on the back surface of the third left side wall portion 252, a flat plate-shaped third left side engaging portion 253 that extends vertically with a space therebetween is provided. The space between the back surface of the third left side wall portion 252 and the third left side engaging portion 253 is substantially equal to the thickness of the first left side engaging portion 213 of the first dividing plate 210.

[0060] At the lower end of the third bottom plate portion 251, a third lower side wall portion 254 that extends horizontally in the left-right direction and protrudes forward is provided, and near the right end of the third lower side wall portion 254, a third lower side engaging portion 255 that protrudes upward is provided. The specific shapes of the third lower side wall portion 254 and the third lower side engaging portion 255 are equivalent to those of the lower end wall portion 27 and the first lower side engaging portion 28 in the first embodiment.

[0061] The upper end on the front side of the third bottom plate portion 251 is provided with a third upper convex portion 261 that is composed of a pair of convex portions that extend horizontally in the left-right direction and protrude forward, and a convex portion that protrudes forward so as to connect the right ends of the convex portions. Below the third upper convex portion 261, a third central convex portion 262 having the same shape as the third upper convex portion 261 is provided with a space therebetween, and below the third central convex portion 262, a third lower convex portion 263 having the same shape as the third upper convex portion 261 is provided with a space therebetween. The amount of forward protrusion of the third upper convex portion 261, the third central convex portion 262, and the third lower convex portion 263 is equal to that of the third lower side wall portion 254, and the space between the third upper convex portion 261 and the third central convex portion 262 and the space between the third central convex portion 262 and the third lower convex portion 263 are equal.

[0062] The region surrounded by the lower ends of these third upper convex portions 261, the upper ends of the third central convex portions 262, the right ends of the third left side wall portions 252, and the front surface of the third bottom plate portion 251 can be referred to as a third upper concave portion 264 that is recessed from the front surface toward the back surface. Further, the region surrounded by the lower ends of the third central convex portions 262, the upper ends of the third lower convex portions 263, the right ends of the third left side wall portions 252, and the front surface of the third bottom plate portion 251 can be referred to as a third lower concave portion 265 that is recessed from the front surface toward the back surface.

[0063] Subsequently, the structure of the fourth weir plate 270 will be described with reference to FIGS. 27-29. The fourth weir plate 270 includes a fourth bottom plate portion 271 that is rectangular plate-shaped with the vertical direction as the short side, the horizontal direction as the long side, and has a constant thickness in the front-rear direction. The vertical width, horizontal width, and front-rear thickness of the fourth bottom plate portion 271 are equal to those of the first bottom plate portion 211. Near the right end of this fourth bottom plate portion 271, a fourth right side wall portion 272 that bulges rearward is provided, and on the back surface of the fourth right side wall portion 272, a flat plate-shaped fourth right side engaging portion 273 that extends vertically with a gap is provided. The gap between the back surface of this fourth right side wall portion 272 and the fourth right side engaging portion 273 is substantially equal to the thickness of the second right side engaging portion 233 of the second dividing plate 230.

[0064] At the upper end on the back side of the fourth bottom plate portion 271, a fourth upper side wall portion 274 that extends horizontally in the left-right direction and protrudes rearward is provided. Further, at the lower end of the fourth bottom plate portion 271, a fourth lower side wall portion 275 that extends horizontally in the left-right direction and protrudes rearward is provided, and at the lower end of this fourth lower side wall portion 275, a fourth lower side engaging portion 276 that extends in the left-right direction and protrudes upward is provided. The shape of this fourth lower side engaging portion 276 is equivalent to the shape of the second lower side engaging portion 47 in the first embodiment. Also, the amount of protrusion rearward of the fourth upper side wall portion 274 and the fourth lower side wall portion 275 is equal to the amount of protrusion forward of the third lower side wall portion 255 and the like in the third weir plate 250.

[0065] On the back side of the fourth bottom plate portion 271, below the fourth upper side wall portion 274, there is provided a fourth upper convex portion 281 which is composed of a pair of convex portions horizontally extending in the left - right direction and protruding rearward, and a convex portion protruding rearward so as to connect the left ends of the convex portions. Below this fourth upper convex portion 281 and above the lower side wall portion 275, a fourth lower convex portion 282 having the same shape as the fourth upper convex portion 281 is provided at intervals. The widths of the upper and lower ends of these fourth upper convex portion 281 and fourth lower convex portion 282 are equal to the vertical width such as that of the third upper concave portion 264 of the third weir plate 250, and the forward protruding amounts of the fourth upper convex portion 281 and fourth lower convex portion 282 are equal to the protruding amounts such as those of the fourth upper side wall portion 274. Also, the intervals between the fourth upper side wall portion 274 and the fourth upper convex portion 281, between the fourth upper convex portion 281 and the fourth lower convex portion 282, and between the fourth lower convex portion 282 and the fourth lower side wall portion 275 are equal, and that interval is equal to the width of the upper and lower ends of the third upper convex portion 261 of the third weir plate 250.

[0066] The region surrounded by the lower end of the fourth upper side wall portion 274, the upper end of the fourth upper convex portion 281, the left end of the fourth right side wall portion 272, and the front surface of the fourth bottom plate portion 271 can be referred to as a fourth upper concave portion 283 that is recessed from the back to the front. Similarly, the region surrounded by the lower end of the fourth upper convex portion 281, the upper end of the fourth lower convex portion 282, the left end of the fourth right side wall portion 272, and the front surface of the fourth bottom plate portion 271 can be referred to as a fourth central concave portion 284 that is recessed from the back to the front, and the region surrounded by the lower end of the fourth lower convex portion 282, the upper end of the fourth lower side wall portion 275, the left end of the fourth right side wall portion 272, and the front surface of the fourth bottom plate portion 271 can be referred to as a fourth lower concave portion 285 that is recessed from the back to the front.

[0067] The procedure for assembling the weir plate 200 by combining the first to fourth dividing plates 210, 230, 250, and 270 described above will be described with reference to FIGS. 14 to 17. First, as shown in FIGS. 14 and 15, the first dividing plate 210 and the second dividing plate 230 are combined. Specifically, the first upper engaging portion 215 and the first lower engaging portion 217 of the first dividing plate 210 are fitted between the second upper engaging portion 235 and the second lower engaging portion 237 of the second dividing plate 230, and then slid in the left-right direction. At this time, since the front surface of the first bottom plate portion 211 of the first dividing plate 210 faces the back surface of the second bottom plate portion 231 of the second dividing plate 230, the front surface of the first bottom plate portion 211 can be referred to as the first opposing surface, and the back surface of the second bottom plate portion 231 can be referred to as the second opposing surface.

[0068] The first upper convex portion 221 of the first dividing plate 210 engages with and fits into the second upper concave portion 243 of the second dividing plate 230, and the front surface and the upper and lower ends of the first upper convex portion 231 respectively abut against the back surface and the upper and lower ends of the second upper concave portion 243. Similarly, the first central convex portion 222 of the first dividing plate 210 engages with and fits into the second central concave portion 244 of the second dividing plate 230, and the front surface and the upper and lower ends of the first central convex portion 222 respectively abut against the back surface and the upper and lower ends of the second central concave portion 244. The first lower convex portion 223 of the first dividing plate 210 engages with and fits into the second lower concave portion 245 of the second dividing plate 230, and the front surface and the upper and lower ends of the first lower convex portion 223 respectively abut against the back surface and the upper and lower ends of the second lower concave portion 245.

[0069] The engagement relationship between the convex portions and the concave portions of the first dividing plate 210 and the second dividing plate 230 can be rephrased. The second upper convex portion 241 of the second dividing plate 230 engages with and fits into the first upper concave portion 224 of the first dividing plate 210, and the front surface and the upper and lower ends of the second upper convex portion 241 respectively abut against the back surface and the upper and lower ends of the first upper concave portion 224. Similarly, the second lower convex portion 242 of the second dividing plate 230 engages with and fits into the first lower concave portion 225 of the first dividing plate 210, and the front surface and the upper and lower ends of the second lower convex portion 242 respectively abut against the back surface and the upper and lower ends of the first lower concave portion 225.

[0070] Subsequently, as shown in FIGS. 16 and 17, the third dividing plate 250 and the fourth dividing plate 270 are combined. Specifically, the third lower engaging portion 255 of the third weir plate 250 is fitted between the fourth lower engaging portions 276 of the fourth weir plate 270 and then slid in the left-right direction. At this time, since the front surface of the third bottom plate portion 251 of the third weir plate 250 faces the rear surface of the fourth bottom plate portion 271 of the fourth weir plate 270, the front surface of the third bottom plate portion 251 can be referred to as the third opposing surface, and the rear surface of the fourth bottom plate portion 271 can be referred to as the fourth opposing surface.

[0071] The third upper convex portion 261 of the third weir plate 250 engages with and fits into the fourth upper concave portion 283 of the fourth weir plate 270, and the front surface and the upper and lower ends of the third upper convex portion 261 respectively abut against the rear surface and the upper and lower ends of the fourth upper concave portion 283. Similarly, the third central convex portion 262 of the third weir plate 250 engages with and fits into the fourth central concave portion 284 of the fourth weir plate 270, and the front surface and the upper and lower ends of the third central convex portion 262 respectively abut against the rear surface and the upper and lower ends of the fourth central concave portion 284. The third lower convex portion 263 of the third weir plate 250 engages with and fits into the fourth lower concave portion 285 of the fourth weir plate 270, and the front surface and the upper and lower ends of the third lower convex portion 263 respectively abut against the rear surface and the upper and lower ends of the fourth lower concave portion 285.

[0072] The engagement relationship between the convex and concave portions of the third weir plate 250 and the fourth weir plate 270 can be rephrased in the same way as in the case of the first dividing plate 210 and the second dividing plate 230. The fourth upper convex portion 281 of the fourth weir plate 270 engages with and fits into the third upper concave portion 264 of the third weir plate 250, and the front surface and the upper and lower ends of the fourth upper convex portion 281 respectively abut against the rear surface and the upper and lower ends of the third upper concave portion 264. Similarly, the fourth lower convex portion 282 of the fourth weir plate 270 engages with and fits into the third lower concave portion 265 of the third weir plate 250, and the front surface and the upper and lower ends of the fourth lower convex portion 282 respectively abut against the rear surface and the upper and lower ends of the third lower concave portion 265.

[0073] As described above, when the first dividing plate 210 and the second dividing plate 230 are combined, and the third weir plate 250 and the fourth weir plate 270 are combined, they are further combined to form one weir plate 200. Specifically, the first left engaging portion 213 of the first dividing plate 210 is inserted while abutting between the third left side wall portion 252 and the third left engaging portion 253 of the third weir plate 250, and the second right engaging portion 233 of the second dividing plate 230 is inserted while abutting between the fourth right side wall portion 272 and the fourth right engaging portion 273 of the fourth weir plate 270. Thus, the weir plate 200 shown in FIGS. 12 and 13 is completed.

[0074] Regarding the weir plate 200 described above, if the width is to be changed, the first dividing plate 210 and the third weir plate 250 and the second dividing plate 230 and the fourth weir plate 270 may be relatively moved in the left-right direction. At this time, each convex portion 221, 222, 223, 241, 242, 261, 262, 263, 281, 282 and each concave portion 224, 225, 243, 244, 245, 264, 265, 283, 284, 285 slide in the left-right direction while abutting. More specifically, the upper and lower surfaces of each convex portion 221, 222, 223, 241, 242, 261, 262, 263, 281, 282 abut against the upper and lower surfaces of each concave portion 224, 225, 243, 244, 245, 264, 265, 283, 284, 285, and the tip surfaces of each convex portion 221, 222, 223, 241, 242, 261, 262, 263, 281, 282 abut against the bottom surfaces of each concave portion 224, 225, 243, 244, 245, 264, 265, 283, 284, 285 and slide. Incidentally, each convex portion 221, 222, 223, 241, 242, 261, 262, 263, 281, 282 and each concave portion 224, 225, 243, 244, 245, 264, 265, 283, 284, 285 can be collectively referred to as a slide mechanism.

[0075] Also, if the height is to be changed, the first dividing plate 210 and the second dividing plate 230 and the third weir plate 250 and the fourth weir plate 270 may be relatively moved in the vertical direction. At this time, the first left engaging portion 213 slides while abutting against the back surface of the third left wall portion 252 and the front surface of the third left engaging portion 253, and the second right engaging portion 233 slides while abutting against the back surface of the fourth right wall portion 272 and the front surface of the fourth right engaging portion 273.

[0076] The weir plate 200 according to the present embodiment described above is installed in the drain pan 100 in the same manner as the weir plate 10 according to the first embodiment. Then, in the same manner as in the first embodiment, mud and sand contained in the water blocked by the weir accumulate on the front side of the weir plate 200, and the accumulated sand and mud fit between the convex portions 221, 222, 223, 241, 242, 261, 262, 263, 281, 282 and the concave portions 224, 225, 243, 244, 245, 264, 265, 283, 284, 285. Thereby, the first dividing plate 210 and the second dividing plate 230 mesh with each other via sand and mud, and the third dividing plate 250 and the fourth dividing plate 270 mesh with each other via sand and mud.

[0077] Also, sand and mud fit between the first left engaging portion 213 and the back surface of the third left wall portion 252 and the front surface of the third left engaging portion 253, and sand and mud fit between the second right engaging portion 233 and the back surface of the fourth right wall portion 272 and the front surface of the fourth right engaging portion 273. Thereby, the first dividing plate 210 and the third dividing plate 250 mesh with each other via sand and mud, and the second dividing plate 230 and the fourth dividing plate 270 mesh with each other via sand and mud. As described above, when the first to fourth dividing plates 210, 230, 250, 270 mesh with each other, their frictional resistance suppresses relative movement in the vertical, horizontal, and lateral directions, and the height and width in the state where the weir plate 200 is installed can be maintained.

[0078] Note that the areas of the sliding portions between the first left engaging portion 213, the back surface of the third left wall portion 252, and the third left engaging portion 253, and the areas of the sliding portions between the second right engaging portion 233, the back surface of the fourth right wall portion 272, and the fourth right engaging portion 273 are smaller than the areas of the sliding portions between the respective convex portions 221, 222, 223, 241, 242, 261, 262, 263, 281, 282 and the respective concave portions 224, 225, 243, 244, 245, 264, 265, 283, 284, 285. That is, the area of the sliding portion in the vertical direction is smaller than the area of the sliding portion in the horizontal direction. When sand or mud meshes, the frictional resistance in the vertical direction becomes smaller than the frictional resistance in the horizontal direction. Therefore, the effect of suppressing sliding due to the meshing of sand or mud is greater in the horizontal direction than in the vertical direction. In other words, it can be said that it is easier to change the height in the vertical direction than to change the width in the horizontal direction. Thereby, even when sand or mud is meshing, the height of the weir plate 200 can be changed to adjust the water level of the water channel.

[0079] <Modification Example> · In the first embodiment, the weir plate 10 is constituted by two split plates 20 and 40, but it may be constituted by three or more split plates that slide in the horizontal direction. Similarly, in the second embodiment, three or more split plates may slide in the horizontal direction, or three or more split plates may slide in the vertical direction.

[0080] · Both the weir plate 10 according to the first embodiment and the weir plate 200 according to the second embodiment may be used simultaneously. Specifically, one or more weir plates 10 according to the first embodiment may be placed on the lower end side of the drain pan 100, and the weir plate 200 according to the second embodiment may be placed thereon. By doing so, after roughly adjusting the water level according to the number of weir plates 10 according to the first embodiment, the water level can be finely adjusted by the weir plate 200 according to the second embodiment.

[0081] · In the first embodiment, the upper and lower side surfaces and the tip surface of the convex portions 31 and 32 are in contact with the upper and lower side surfaces and the bottom surface of the concave portion 51, but only a part of them may be in contact and slide left and right.

[0082] · In the first embodiment, the convex portions 31 and 32 extend over substantially the entire left - right direction. However, convex portions shorter than the convex portions 31 and 32 in the first embodiment may be provided at intervals in the left - right direction. By doing so, the friction between the convex portions 31 and 32 and the concave portion 51 is reduced, and the width adjustment by sliding in the left - right direction can be performed more easily.

[0083] · In the first and second embodiments, holes for inserting screws or the like may be provided to suppress the relative movement of the partition plates 20, 40, 210, 230, 250, and 270. By doing so, even when the amount of sand and mud contained in water is small and the effect of suppressing the relative movement of the partition plates 20, 40, 210, 230, 250, and 270 by sand and mud cannot be sufficiently obtained, the weir plates 20 and 200 can be appropriately installed.

[0084] · In the first and second embodiments, openings penetrating the partition plates 20, 40, 210, 230, 250, and 270 in the front - rear direction may be provided, and the closed state and the open state of the openings may be changeable. By doing so, the openings are usually closed, and when it is necessary to reduce the water level, drainage can be achieved by opening the openings, and the water level can be adjusted without removing the weir plates 20 and 200.

[0085] · In the embodiments, the weir plates 10 and 200 are used by being attached to the drain pan 100 provided in the water channel. However, it may be installed in the water channel of a paddy field where the drain pan 100 is not provided, or may be installed in various other water channels. In this case, depending on the installed water channel, the amount of sand and mud contained in the water may be small, but by adding auxiliary fixing means such as screws, the relative movement of the partition plates 20, 40, 210, 230, 250, and 270 may be suppressed.

Explanation of reference numerals

[0086] Weir plate…10, first dividing plate…20, first convex portion…31, second convex portion…32, second dividing plate…40, concave portion…51, drain pan…100, weir plate…200, first dividing plate…210, first upper convex portion…221, first central convex portion…222, first lower convex portion…223, first upper concave portion…224, first lower concave portion 225, second dividing plate…230, second upper convex portion…241, second lower convex portion…242, second upper concave portion…243, second central concave portion…244, second lower concave portion 245, third dividing plate…250, third upper convex portion…261, third central convex portion…262, third lower convex portion…263, fourth dividing plate…270, fourth upper convex portion…281, fourth lower convex portion…282, fourth upper concave portion…283, fourth central concave portion…284, fourth lower concave portion 285

Claims

1. A weir plate installed in a water channel with the first direction as the flow path direction and the second direction orthogonal to the first direction as the width direction, comprising: a plate-shaped first dividing plate having a first opposing surface; a second dividing plate having a second opposing surface that opposes the first opposing surface in the first direction; another dividing plate that opposes the first dividing plate and the second dividing plate in the first direction, and a convex portion that protrudes toward the opposing side in the first direction and extends in the second direction is provided on the first opposing surface; a concave portion that extends in the second direction and can engage with the convex portion is provided on the second opposing surface; the first dividing plate and the second dividing plate are relatively movable in the second direction with the outer surface of the convex portion and the inner surface of the concave portion sliding; the another dividing plate is relatively movable with respect to the first dividing plate and the second dividing plate in a third direction orthogonal to the first direction and the second direction.

2. The convex portion is erected toward the opposing side in the first direction and includes a first side surface portion extending in the second direction, and a tip surface portion provided at the tip on the first direction side and extending in the second direction, and the concave portion is erected toward the opposing side in the first direction and extends in the second direction, and includes a second side surface portion slidable with respect to the first side surface portion, and a bottom surface located on the back side of the opposing side and extending in the second direction and slidable with respect to the tip surface portion. The weir plate according to claim 1.

3. The weir plate according to claim 1 or 2, wherein the first opposing surface can be installed facing the upstream side of the water channel.

4. The weir plate according to any one of claims 1 to 3, wherein an end portion on the second direction side of the concave portion is open to the outside.

5. The another dividing plate is composed of a third dividing plate and a fourth dividing plate that oppose each other in the first direction, and the third dividing plate and the fourth dividing plate are relatively movable in the second direction. The weir plate according to any one of claims 1 to 4.

6. It is possible to stack a plurality in the third direction. The weir plate according to any one of claims 1 to 5.

7. A method of installing a weir plate composed of a plurality of dividing plates in a water channel, wherein the dividing plate is provided with a slide mechanism that can change the width of both ends of the weir plate by relatively moving in the width direction of the water channel, the dividing plates are relatively moved so that the width of the weir plate is the width across the water channel, and the weir plate is arranged in the water channel. At least a part of the surface of the weir plate facing the upstream direction is buried by sediment contained in the water flowing through the water channel, An installation method of a weir plate, which suppresses the relative movement of the partition plate by the slide mechanism due to the sediment that has entered the slide mechanism and maintains the width of the weir plate.

8. An installation structure in which a weir plate composed of a plurality of partition plates is installed in a water channel, The partition plate is provided with a slide mechanism capable of relatively moving in the width direction of the water channel to change the widths of both ends of the weir plate, The weir plate is arranged in the water channel with the width of the weir plate being the width across the water channel by relatively moving the partition plates, At least a part of the surface of the weir plate facing the upstream direction is buried by sediment contained in the water flowing through the water channel, An installation structure of a weir plate, in which the relative movement of the partition plate by the slide mechanism is suppressed by sediment that has entered the slide mechanism, and the width of the weir plate is maintained.

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