Debris inflow prevention device and debris inflow prevention method

Abstract

To efficiently, safely, and reliably perform maintenance and inspection of the sand discharge door and lubricate the wire ropes. [Solution] A debris inflow prevention device for surrounding the opening of a passage in an embankment, which includes an inclined surface through which water mixed with debris from the upstream side that has crossed the crest flows, a first passage for discharging sediment accumulated on the upstream side of the waterbed to the downstream side, a second passage extending vertically between the inclined surface and the first passage, and a sediment discharge door that is lifted up in the second passage when the first passage is opened by a wire rope connected through the opening of the second passage on the inclined surface side, comprising: a first vertical plate coupled to a vertical wall extending vertically upstream of the passage opening, a second vertical plate adjacent to the vertical wall and surrounding the passage opening, and a third vertical plate that relays between the first vertical plate and the second vertical plate and is detachably coupled to the first vertical plate and the second vertical plate.

Description

Technical Field

[0001] The present invention relates to a dust inflow prevention device and a dust inflow prevention method.

Background Art

[0002] For example, there is known a dam having a structure in which water on the upstream side that has exceeded the top edge of the dam body is discharged downstream along the slope of the downstream slope. The dam body is provided with a sand discharge port for discharging sediment deposited at the bottom on the upstream side to the downstream side, and a sand discharge gate for opening and closing the sand discharge port. The sand discharge gate is connected to a wire rope in a passage provided between the inclined surface and the sand discharge port. When the sand discharge gate is lifted by the wire rope, the sand discharge port opens, and it becomes possible to discharge the sediment on the upstream side. (For example, Patent Document 1)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, an opening for winding up the side opposite to the side connected to the sand discharge gate of the wire rope from the passage is provided on the inclined surface of the dam body by an electric winch or the like. Further, around the opening, in order to prevent dust flowing in with water from the upstream side and dust previously remaining on the inclined surface from flowing into the opening when the water on the upstream side flows over the top edge and flows on the inclined surface, a metal vertical plate surrounding the opening is joined. The vertical plate is an integrally formed object having a large weight with a length in each of the three-dimensional directions on the order of several meters, and it is difficult to remove once it is joined around the opening.

[0005] Therefore, in order to ensure that sediment from the upstream side can be stably discharged downstream through the sediment discharge port, the periodic maintenance and inspection of the sediment discharge gate and the lubrication of the wire ropes are carried out by workers standing on scaffolding erected around the connected vertical plates.

[0006] However, in addition to the cost of setting up scaffolding, an application based on the River Act is required to set up scaffolding, which meant that it would take a lot of time to complete the above work. Furthermore, since the above work would be carried out using scaffolding and vertical boards, it would be difficult to carry out the work, which could lead to a lower quality of work and a risk of not being able to ensure the safety of the workers.

[0007] The present invention has been made in view of the above problems, and one of its objectives is to provide a debris inflow prevention device and a debris inflow prevention method that enable efficient, safe, and reliable maintenance and inspection of the sand discharge door and lubrication of the wire rope. [Means for solving the problem]

[0008] One of the present inventions for achieving the above objective is a debris inflow prevention device, which surrounds the opening of a passage in an embankment including: an inclined surface through which water mixed with debris from the upstream side beyond the top flows; a first passage for discharging sediment accumulated on the upstream side of the waterbed to the downstream side; a second passage extending vertically between the inclined surface and the first passage; and a sand discharge door that is lifted in the second passage when the first passage is opened by a wire rope connected through the opening of the second passage on the inclined surface side, the device comprising: a first vertical plate coupled to a vertical wall extending vertically upstream of the opening of the passage; a second vertical plate adjacent to the vertical wall and surrounding the opening of the passage; and a third vertical plate that relays between the first vertical plate and the second vertical plate and is detachably coupled to the first vertical plate and the second vertical plate.

[0009] Another aspect of the present invention for achieving the above objective is a debris inflow prevention device, wherein the dam body includes a horizontal floor extending horizontally around the periphery except for the upstream side of the opening of the passage, and the lower side of the second vertical plate is integrally formed with a horizontal plate that is detachably coupled to the horizontal floor.

[0010] According to the debris inflow prevention device of the present invention, since the second vertical plate and the horizontal plate are integrated, when water that has exceeded the top of the dam body flows down the slope, it is possible to reliably prevent dust from flowing into the opening, and it becomes possible to set a longer maintenance cycle for maintenance and inspection of the sand discharge door and lubrication of the wire rope.

[0011] Furthermore, another aspect of the present invention for achieving the above objective is a dust inflow prevention device, wherein the first vertical plates are coupled in pairs on both sides in the width direction of the vertical wall, the second vertical plates include a pair of opposing regions that each face the pair of first vertical plates, and the third vertical plates are provided in pairs, with one of the third vertical plates coupling one of the first vertical plates and one of the opposing regions of the second vertical plate, and the other of the third vertical plates coupling the other of the first vertical plate and the other opposing region of the second vertical plate.

[0012] Furthermore, another aspect of the present invention for achieving the above objective is a dust inflow prevention device, wherein the third vertical plate is connected to the first vertical plate and the second vertical plate using bolts and nuts.

[0013] Furthermore, another aspect of the present invention for achieving the above objective is a dust inflow prevention device, wherein the first to third vertical plates are formed of steel plates.

[0014] Another aspect of the present invention for achieving the above objective is a dust inflow prevention device, wherein the floor is made of concrete, the horizontal plate is made of steel plate and is connected to the floor using bolts and nuts.

[0015] According to the dust inflow prevention device of the present invention, the third vertical plate can be removed from the first vertical plate and the second vertical plate, and the second vertical plate can be removed from around the opening. Therefore, it is possible to efficiently and safely perform the maintenance and inspection of the sand discharge door and the operation of greasing the wire rope.

[0016] In addition, the problems disclosed in the present application and the solutions thereto are clarified by the column of the mode for carrying out the invention and the drawings.

Effect of the Invention

[0017] According to the present invention, it is possible to efficiently, safely and reliably perform the maintenance and inspection of the sand discharge door and the operation of greasing the wire rope.

Brief Description of the Drawings

[0018] [Figure 1A] It is a front view showing an example of the levee 100 with the sand discharge port 400 closed. [Figure 1B] It is a front view showing an example of the levee 100 with the sand discharge port 400 open. [Figure 2A] It is a side sectional view of Fig. 1A. [Figure 2B] It is a side sectional view of Fig. 1B. [Figure 3] It is a perspective view showing a part of the levee 100 shown in Figs. 1A, 1B, 2A, and 2B. [Figure 4] It is a perspective view showing an example of the sand discharge door 500 for opening and closing the sand discharge port 400. [Figure 5A] It is an exploded perspective view when the dust inflow prevention device 1 is viewed from one direction. [Figure 5B] It is a perspective view when the dust inflow prevention device 1 is mounted on the levee 100 and viewed from one direction. [Figure 6A] It is a perspective view when the dust inflow prevention device 1 is viewed from another direction. [Figure 6B] It is a perspective view when the dust inflow prevention device 1 is mounted on the levee 100 and viewed from another direction. [Figure 7A] It is an exploded plan view showing the dust inflow prevention device 1. [Figure 7B] FIG. 1 is a plan view showing a state where the dust inflow prevention device 1 is attached to the levee 100. [Figure 8A] FIG. 2 is a side view showing a state where the dust inflow prevention device 1 is attached to the levee 100. [Figure 8B] FIG. 3 is another side view showing a state where the dust inflow prevention device 1 is attached to the levee 100.

Mode for Carrying Out the Invention

[0019] From the description in this specification and the accompanying drawings, at least the following matters become clear. Hereinafter, the present invention will be described based on one embodiment thereof with reference to the accompanying drawings. ===An Example of the Structure of the Levee 100=== FIG. 1A is a front view showing an example of the levee 100 with the sand discharge port 400 closed. FIG. 1B is a front view showing an example of the levee 100 with the sand discharge port 400 open. FIG. 2A is a side sectional view of FIG. 1A. FIG. 2B is a side sectional view of FIG. 1B. FIG. 3 is a perspective view showing a part of the levee 100 shown in FIGS. 1A, 1B, 2A, and 2B. FIG. 4 is a perspective view showing an example of the sand discharge door 500 for opening and closing the sand discharge port 400. In FIGS. 1A, 1B, 2A, 2B, 3, and 4, for the sake of easy understanding of the explanation, the X-axis, Y-axis, and Z-axis are shown. In this embodiment, the X-axis is an axis along the width direction (horizontal direction) of the levee 100, the Y-axis is an axis along the height direction (vertical direction) of the levee 100, and the Z-axis is an axis along the thickness direction (direction perpendicular to the XY plane) of the levee 100 between the upstream side and the downstream side. Also, the dust inflow prevention device 1 is not shown in FIGS. 1A, 1B, 2A, 2B, and 4.

[0020] The dam body 100 is a type of dam structure that is installed, for example, at a predetermined location in a river to block the flow of water between the upstream side (+Z side) and the downstream side (-Z side), thereby damming and storing water on the upstream side. The dam body 100 includes an inclined surface 300 that slopes downward from the crest 200 (upper end in the +Y direction) toward the downstream side. When the water level of the water stored on the upstream side exceeds the crest 200, the water that exceeds the crest 200 flows downstream along the inclined surface 300, thereby maintaining the maximum water level of the water stored on the upstream side at the height of the crest 200.

[0021] Furthermore, because the dam body 100 blocks the flow of river water, sediment gradually accumulates on the riverbed 700 upstream of the dam body 100. Therefore, the dam body 100 is further composed of a sediment discharge port 400, a sediment discharge door 500, and a passage 600 (second passage) as means for periodically discharging the sediment accumulated on the riverbed 700 (bottom) upstream of the dam body 100 to the downstream side of the dam body 100. The dam body 100, including the crest 200, the inclined surface 300, the sediment discharge port 400, and the passage 600, is formed of reinforced concrete, for example, and the sediment discharge door 500 is formed of steel plate, for example.

[0022] The sediment discharge port 400 is constructed including a sediment discharge passage 410 that penetrates between the upstream and downstream sides along the thickness direction of the dam body 100 at the deepest point (-Y direction) of the dam body 100 adjacent to the riverbed 700. The sediment discharge port 400 slopes downward from the upstream side to the downstream side to facilitate the discharge of sediment accumulated on the upstream side to the downstream side. When the sediment discharge port 400 is viewed in the thickness direction of the dam body 100 (the direction from the upstream side to the downstream side of the dam body 100 or the direction from the downstream side to the upstream side of the dam body 100), the shape of the sediment discharge port 400 when divided vertically (parallel to the XY plane) is a rectangle at any point between the upstream and downstream sides, for example, consisting of two sides along the horizontal direction and two sides along the vertical direction.

[0023] The sediment discharge door 500 is a door that opens and closes the sediment discharge port 400. Specifically, the sediment discharge door 500 is installed so as to be able to move vertically at a predetermined position between the upstream and downstream sides of the sediment discharge passage 410. When it is necessary to discharge sediment accumulated on the riverbed 700 on the upstream side to the downstream side, the door moves vertically upward (+Y direction) to open the sediment discharge passage 410 and open the sediment discharge port 400. On the other hand, when it is not necessary to discharge sediment on the upstream side to the downstream side, the door moves vertically downward (-Y direction) to block the sediment discharge passage 410 and close the sediment discharge port 400.

[0024] The shape of the sand discharge door 500 is, for example, a rectangular parallelepiped consisting of four vertical plates 510, 520, 530, and 540 and two horizontal plates 550 and 560.

[0025] The vertical plate 510 is parallel to the vertical surface of the sediment discharge port 400 and faces the downstream side of the sediment discharge passage (first passage) 410. The area of ​​the vertical plate 510 is larger than the area of ​​the vertical surface of the sediment discharge port 400 at the predetermined position where the sediment discharge door 500 is installed, so that it can block the sediment discharge passage 410. Opening and closing the sediment discharge port 400 is equivalent to opening and closing the sediment discharge passage 410.

[0026] The vertical plate 520 is parallel to the vertical plate 510 and faces the upstream side of the sediment discharge passage 410. The area of ​​the vertical plate 520 is larger than the area of ​​the vertical surface of the sediment discharge opening 400 at the predetermined position where the sediment discharge door 500 is installed, so that it can block the sediment discharge passage 410. The area of ​​the vertical plate 520 is the same as the area of ​​the vertical plate 510, and the vertical plate 520 is positioned opposite the vertical plate 510 so as to overlap with it.

[0027] The vertical plate 530 is perpendicular to the vertical plates 510 and 520, and is sandwiched between the left-hand (-X) ends of the vertical plates 510 and 520 that are aligned with the Y axis.

[0028] The vertical plate 540 is perpendicular to the vertical plates 510 and 520, and is sandwiched between the ends of the vertical plates 510 and 520 along the Y-axis on the right side (+X side) of the paper. The area of ​​the vertical plate 540 is the same as the area of ​​the vertical plate 530, and the vertical plate 540 is positioned opposite the vertical plate 530 so as to overlap with it.

[0029] The horizontal plate 550 is perpendicular to the vertical plates 510, 520, 530, and 540, and is sandwiched between the upper (+Y) edges of the vertical plates 510, 520, 530, and 540 that are aligned with the X-axis.

[0030] The horizontal plate 560 is perpendicular to the vertical plates 510, 520, 530, and 540, and is sandwiched between the ends of the vertical plates 510, 520, 530, and 540 along the X-axis on the lower side (-Y side) of the paper. The area of ​​the horizontal plate 560 is the same as the area of ​​the horizontal plate 550, and the horizontal plate 560 is positioned opposite the horizontal plate 550 so as to overlap with it.

[0031] The cylindrical rotating body 531 is pivotally supported on the vertical plate 530 so as to rotate around an axis of rotation that extends perpendicular to the vertical plate 530 (along the X-axis). The diameter of the rotating body 531 is longer than the horizontal width (along the Z-axis) of the vertical plate 530. The mounting position of the axis of rotation of the rotating body 531 is at the midpoint of the horizontal width of the vertical plate 530.

[0032] The cylindrical rotating body 532 is pivotally supported on the vertical plate 530 so as to rotate around an axis of rotation that extends perpendicular to the vertical plate 530 (along the X-axis). On the vertical plate 530, the rotating body 532 is pivotally supported at a position lower than where the rotating body 531 is pivotally supported (a position in the -Y direction). The diameter of the rotating body 532 is the same as the diameter of the rotating body 531 and is longer than the horizontal width (along the Z-axis) of the vertical plate 530. The mounting position of the axis of rotation of the rotating body 532 is at the midpoint of the horizontal width of the vertical plate 530.

[0033] In this way, when the rotating bodies 531 and 532 are attached to the vertical plate 530, a portion of the rotating body 531 closer to the vertical plate 510 (-Z side) in the horizontal direction and a portion of the rotating body 531 closer to the vertical plate 520 (+Z side) in the horizontal direction will protrude evenly from the vertical plate 530, and a portion of the rotating body 532 closer to the vertical plate 510 (-Z side) in the horizontal direction and a portion of the rotating body 532 closer to the vertical plate 520 (+Z side) in the horizontal direction will protrude evenly from the vertical plate 530.

[0034] Similarly, the cylindrical rotating body 541 is pivotally supported on the vertical plate 540 so as to rotate around an axis of rotation that extends perpendicular to the vertical plate 540 (along the X-axis). The diameter of the rotating body 541 is greater than the horizontal width (along the Z-axis) of the vertical plate 540. The mounting position of the axis of rotation of the rotating body 541 is at the midpoint of the horizontal width of the vertical plate 540.

[0035] The cylindrical rotating body 542 is pivotally supported on the vertical plate 540 so as to rotate around an axis of rotation that extends perpendicular to the vertical plate 540 (along the X-axis). On the vertical plate 540, the rotating body 542 is pivotally supported at a position lower than where the rotating body 541 is pivotally supported (a position in the -Y direction). The diameter of the rotating body 542 is the same as the diameter of the rotating body 541 and is longer than the horizontal width (along the Z-axis) of the vertical plate 540. The mounting position of the axis of rotation of the rotating body 542 is at the midpoint of the horizontal width of the vertical plate 530.

[0036] In this way, when the rotating bodies 541 and 542 are attached to the vertical plate 540, a portion of the rotating body 541 closer to the vertical plate 510 (-Z side) in the horizontal direction and a portion of the rotating body 541 closer to the vertical plate 520 (+Z side) in the horizontal direction will protrude evenly from the vertical plate 540, and a portion of the rotating body 542 closer to the vertical plate 510 (-Z side) in the horizontal direction and a portion of the rotating body 542 closer to the vertical plate 520 (+Z side) in the horizontal direction will protrude evenly from the vertical plate 540.

[0037] When the sand discharge door 500 is moving vertically (along the Y-axis) within the passage 600, the sand discharge door 500 may swing in directions other than vertical. In this case, the sand discharge door 500 is protected from damage by either the outer circumferential surfaces of parts of the rotating bodies 531 and 532 that protrude from the vertical plate 510 side of the vertical plate 530 and the outer circumferential surfaces of parts of the rotating bodies 541 and 542 that protrude from the vertical plate 510 side of the vertical plate 540 contacting the inner wall of the passage 600 opposite the vertical plate 510, or by the outer circumferential surfaces of parts of the rotating bodies 531 and 532 that protrude from the vertical plate 520 side of the vertical plate 530 and the outer circumferential surfaces of parts of the rotating bodies 541 and 542 that protrude from the vertical plate 520 side of the vertical plate 540 contacting the inner wall of the passage 600 opposite the vertical plate 520. Furthermore, the sand discharge door 500 is protected from damage by either the side of the rotating bodies 531 and 532 opposite to the vertical plate 530 (-X side) contacting the inner wall of the passage 600 facing the vertical plate 530, or by the side of the rotating bodies 541 and 542 opposite to the vertical plate 540 (+X side) contacting the inner wall of the passage 600 facing the vertical plate 540.

[0038] When the sand discharge door 500 is moving vertically within the passage 600, if the outer circumferential surfaces of a portion of the rotating bodies 531, 532 that protrude from the vertical plate 510 side of the vertical plate 530 and the outer circumferential surfaces of a portion of the rotating bodies 541, 542 that protrude from the vertical plate 510 side of the vertical plate 540 come into contact with the inner wall of the passage 600 opposite to the vertical plate 510, or if the outer circumferential surfaces of a portion of the rotating bodies 531, 532 that protrude from the vertical plate 520 side of the vertical plate 530 and the outer circumferential surfaces of a portion of the rotating bodies 541, 542 that protrude from the vertical plate 520 side of the vertical plate 540 come into contact with the inner wall of the passage 600 opposite to the vertical plate 520, the rotating bodies 531, 532, 541, 542 will rotate, and the vertical movement of the sand discharge door 500 will proceed smoothly.

[0039] The pulley base 551 is connected to the upper surface (+Y side) of the horizontal plate 550 on the side closer to the vertical plate 530 (-X side). Two pulleys, for example, 552 and 553, are pivotally supported on the pulley base 551 so as to rotate around the same axis of rotation. The axis of rotation of pulleys 552 and 553 is an axis that extends in the direction along the X axis. The position of the axis of rotation of pulleys 552 and 553 is an intermediate position between the end of the horizontal plate 550 on the vertical plate 510 side and the end on the vertical plate 520 side. When viewed from the direction of the axis of rotation, the wire ropes 552A and 553A are tightly attached in a U-shape to the grooves formed around the entire outer circumference of pulleys 552 and 553, respectively, with both ends facing upwards (+Y side).

[0040] Similarly, the pulley base 554 is connected to the upper surface (+Y side) of the horizontal plate 550 on the side closer to the vertical plate 540 (+X side). Two pulleys, for example, 555 and 556, are pivotally supported on the pulley base 554 so as to rotate around the same axis of rotation. The axes of rotation of pulleys 555 and 556 are coaxial with the axes of rotation of pulleys 552 and 553. When viewed from the direction of the axis of rotation, the wire ropes 555A and 556A are tightly attached in a U-shape to the grooves formed around the entire outer circumference of pulleys 555 and 556, respectively, with both ends facing upwards (+Y side). Furthermore, since wire ropes 552A, 553A, 555A, and 556A are metal ropes made by twisting seamless steel wires together to create strands, and then twisting these strands around a core steel at a constant pitch, regular lubrication of wire ropes 552A, 553A, 555A, and 556A is necessary for them to function properly.

[0041] The pulley platforms 551 and 554 are connected at positions symmetrical along the X-axis, with the boundary being the midpoint between the end of the horizontal plate 550 on the vertical plate 530 side (-X side) and the end of the vertical plate 540 side (+X side). The sand discharge door 500 is lifted by wire ropes 552A, 553A, 555A, and 556A. This allows the sand discharge door 500 to move stably in the vertical direction.

[0042] The passage 600 is a vertically extending elongated hole that guides the sand discharge door 500 along the inner wall of the passage 600 as it moves vertically. Specifically, the passage 600 is an elongated hole that penetrates vertically between the sand discharge opening 400 and the inclined surface 300 at a predetermined position where the sand discharge door 500 is installed. The shape of the passage 600 from the sand discharge opening 400 to the inclined surface 300 is a rectangular prism shape of a size that can smoothly guide the rectangular sand discharge door 500. When viewing the passage 600 in the longitudinal direction (along the Y-axis), the shape of the surface perpendicular to the longitudinal direction of the passage 600 (the surface parallel to the XZ plane) is a rectangle of a size that allows the sand discharge door 500, which is integrated with the rotating bodies 531, 532, 541, and 542, to fit within the passage 600. In other words, within the passage 600, inner walls are provided that face the vertical surfaces 510, 520, 530, and 540 of the sand discharge door 500, respectively.

[0043] Around the passage 600 that penetrates the inclined surface 300, a rectangular prism-shaped work platform 110 is formed integrally with the dam body 100, projecting vertically upward (+Y direction) from the inclined surface 300, allowing workers to perform maintenance and inspection of the sand discharge door 500 and lubrication of wire ropes 552A, 553A, 555A, and 556A. Inside the work platform 110, the passage 600 is formed, penetrating vertically upward from the inclined surface 300. On the upper surface of the work platform 110, the upper end of the passage 600 is formed as an opening 610, and a horizontal floor 120 is formed around the opening 610, flush with the opening 610 and horizontal (parallel to the XZ plane), so that workers can safely perform the above work.

[0044] On the upstream side (+Z side) of the opening 610, a rectangular prism-shaped winding platform 130 is formed integrally with the work platform 110. This platform winds up the wire ropes 552A, 553A, 555A, and 556A when the sand discharge door 500 is raised vertically upward, and releases the wound-up wire ropes 552A, 553A, 555A, and 556A when the sand discharge door 500 is lowered vertically downward.

[0045] On the downstream side (-Z side) of the winding table 130, a vertical wall 140 is formed that rises vertically upward from the upstream side of the opening 610. On the opposite side (+Y side) of the vertical wall 140 from the opening 610, an inclined wall 150 is formed integrally with the vertical wall 14, which extends downstream as it goes vertically upward. The inclined wall 150 faces the opening 610 in the vertical direction (along the Y axis). The inclined wall 150 has an insertion hole 160 that penetrates vertically. The wire ropes 552A, 553A, 555A, and 556A, which are wound around the pulleys 552, 553, 555, and 556 respectively, extend vertically upward, and both ends of the wire ropes 552A, 553A, 555A, and 556A are inserted into the insertion hole 160.

[0046] The winding device 800 is a device that includes, for example, an electric winch capable of winding and unwinding the rope. The winding device 800 is coupled to the top surface (+Y side surface) of the winding base 130. Both ends of the wire ropes 552A, 553A, 555A, and 556A are connected to the winding device 800 via the insertion holes 160. The winding device 800 operates to wind up the wire ropes 552A, 553A, 555A, and 556A when the sand discharge door 160 is raised vertically upward, and to unwind the wound wire ropes 552A, 553A, 555A, and 556A when the sand discharge door 160 is lowered vertically downward. ===An example of a dust and debris inflow prevention device 1=== Figure 5A is an exploded perspective view of the debris inflow prevention device 1 from one direction. Figure 5B is a perspective view of the debris inflow prevention device 1 attached to the dam body 100 from one direction. Figure 6A is an exploded perspective view of the debris inflow prevention device 1 from another direction. Figure 6B is a perspective view of the debris inflow prevention device 1 attached to the dam body 100 from another direction. Figure 7A is an exploded plan view of the debris inflow prevention device 1. Figure 7B is a plan view showing the debris inflow prevention device 1 attached to the dam body 100. Figure 8A is a side view of one side showing the debris inflow prevention device 1 attached to the dam body 100. Figure 8B is a side view of the other side showing the debris inflow prevention device 1 attached to the dam body 100. Note that in Figures 5A, 5B, 6A, 6B, 7A, 7B, 8A, and 8B, the X, Y, and Z axes are sometimes used for explanation purposes. The directions of the X, Y, and Z axes are the same as those of the X, Y, and Z axes described in Figures 1A, 1B, 2A, 2B, 3, and 4.

[0047] The debris inflow prevention device 1 is a device that is installed around the opening 610 to prevent debris flowing in from the upstream side along with the water, or debris already present on the inclined surface 300 before the upstream water begins to flow on the inclined surface 300, when the water on the upstream side beyond the top 200 of the dam body 100 is flowing on the inclined surface 300, from flowing into the passage 600 through the opening 610 along with the water flowing on the inclined surface 300.

[0048] The dust inflow prevention device 1 is a device that can be detachably attached to the periphery of the opening 610 on the workbench 110. The dust inflow prevention device 1 is formed, for example, from a steel plate. The dust inflow prevention device 1 is composed of a pair of first vertical plates 10A, 10B, a second vertical plate 20, a pair of horizontal plates 30A, 30B, and a pair of third vertical plates 40A, 40B, as means to achieve detachability around the periphery of the opening 610.

[0049] One of the first vertical plates 10A is connected to one end (the -X side end) of the vertical wall 140 in the width direction (the direction along the X axis) along a direction perpendicular to the horizontal floor of the workbench 110 (the direction along the Y axis). The first vertical plate 10A is integrally formed from a flat plate 11A that is parallel to the vertical wall 140 and connected in surface contact to one end of the vertical wall 140, and a flat plate 12A that is perpendicular to the flat plate 11A (parallel to the YZ plane) and extends downstream from one end (the -X side end) of the flat plate 11A. Multiple bolt holes 13A and 14A are drilled in the flat plates 11A and 12A, respectively, along their longitudinal direction. The bolt holes 13A are holes through which bolts 15A are inserted to connect the flat plate 11A to the vertical wall 140. The bolt hole 14A is a hole through which a bolt 16A is inserted to connect the flat plate 12A and the third vertical plate 40A. The shape of the first vertical plate 10A when viewed along the longitudinal direction (direction along the Y-axis) of the vertical wall 140 is L-shaped.

[0050] The other first vertical plate 10B is connected to the other end (+X side end) of the vertical wall 140 in the width direction, along a direction perpendicular to the horizontal floor 120 of the workbench 110. The first vertical plate 10B is integrally formed from a flat plate 11B that is parallel to the vertical wall 140 and connected in surface contact to the other end of the vertical wall 140, and a flat plate 12B that is perpendicular to the flat plate 11B (parallel to the flat plate 12A, i.e., parallel to the YZ plane) and extends downstream from one end (+X direction end) of the flat plate 11B. Multiple bolt holes 13B and 14B are drilled in the flat plates 11B and 12B along their longitudinal directions. Bolt holes 13B are holes through which bolts 15B for connecting the flat plate 11B to the vertical wall 140 are inserted. Bolt holes 14B are holes through which bolts 16B for connecting the flat plate 12B to the third vertical plate 40B are inserted. When the first vertical plate 10B is viewed along the longitudinal direction of the vertical wall 140, its shape is L-shaped.

[0051] When viewed from the longitudinal direction of the vertical wall 140, the shapes of the first vertical plates 10A and 10B, which are connected to the vertical wall 140, are symmetrical.

[0052] The second vertical plate 20 extends vertically upward from the horizontal floor 120 of the workbench 110 and, together with the vertical wall 14, surrounds the opening 610. The second vertical plate 20 is formed by three flat plates 21, 22, and 23 that extend vertically upward from the horizontal floor 120. Flat plate 21 is a plate that extends vertically upward from the edge (one edge along the Z-axis on the -X side) that is perpendicular to the vertical wall 140 in the opening 610 and adjacent to the wire rope 552A. Flat plate 23 is a plate that extends vertically upward from the edge (the other edge along the Z-axis on the +X side) that is perpendicular to the vertical wall 140 in the opening 610 and adjacent to the wire rope 556A. Flat plate 22 is a plate that extends vertically upward from the edge (the edge along the X-axis) opposite to the vertical wall 14 in the opening 610. When the second vertical plate 20 is viewed along the longitudinal direction of the vertical wall 140, it has a U-shape. In the areas of the flat plates 21 and 23 opposite to the flat plate 22, multiple bolt holes 24A and 24B are drilled along the longitudinal direction of the vertical wall 140, respectively. Bolt holes 24A are holes through which bolts 17A are inserted to connect the flat plate 21 to the third vertical plate 40A. Bolt holes 24B are holes through which bolts 17B are inserted to connect the flat plate 23 to the third vertical plate 40B.

[0053] The heights of the first vertical plates 10A, 10B and the second vertical plate 20, which extend vertically upward from the horizontal floor 110 of the workbench 110, are, for example, the same.

[0054] The horizontal plate 30A is a flat plate that extends from the lower side (-Y side) of the flat plate 21 toward the opposite side (-X side) from the opening 610. Multiple bolt holes 31A are drilled in the three sides of the horizontal plate 30A that are not connected to the flat plate 21. The bolt holes 31A are holes through which bolts 18A are inserted to connect the horizontal plate 30A to the horizontal floor 120. When the flat plate 21 and the horizontal plate 30A are viewed along the direction perpendicular to the vertical wall 140 (along the Z axis), they form an L shape.

[0055] The other horizontal plate 30B is a flat plate that extends from the lower side (-Y side) of the flat plate 23 toward the opposite side (+X side) from the opening 610. Multiple bolt holes 31B are drilled in the three sides of the horizontal plate 30B that are not connected to the flat plate 23. The bolt holes 31B are holes through which bolts 18B are inserted to connect the horizontal plate 30B to the horizontal floor 120. When the flat plate 23 and the horizontal plate 30B are viewed along the direction perpendicular to the vertical wall 140, they form an L shape.

[0056] When the horizontal plate 30A is connected to the horizontal floor 120 with bolts 18A, and the horizontal plate 30B is connected to the horizontal floor 120 with bolts 18B, the second vertical plate 20 is fixed in a state that surrounds the opening 610.

[0057] When the first vertical plate 10A is connected to the vertical wall 140 and the horizontal plate 30A is connected to the horizontal floor 120, the flat plate 12A of the first vertical plate 10A and the flat plate 21 of the second vertical plate 20 face each other in a line along a direction perpendicular to the vertical wall 140 (along the Z-axis). The third vertical plate 40A then acts as a bridge between the area of ​​the flat plate 12A of the first vertical plate 10A that faces the flat plate 21 of the second vertical plate 20 (-Z side) and the area of ​​the flat plate 21 of the second vertical plate 20 that faces the flat plate 12A of the first vertical plate 10A (+Z side), and is a flat plate that can be attached to and detached from the flat plates 12A and 21. The third vertical plate 40A has multiple bolt holes 41A drilled in it along the longitudinal direction of the vertical wall 140, which overlap with the multiple bolt holes 14A drilled in the flat plate 12A of the first vertical plate 10A. Furthermore, the third vertical plate 40A also has multiple bolt holes 42A drilled along the longitudinal direction of the vertical wall 140, which overlap with the multiple bolt holes 24A drilled in the flat plate 21 of the second vertical plate 20. When the flat plate 11A of the first vertical plate 10A is connected to the vertical wall 140 at a predetermined position with bolts 15A, and the horizontal plate 30A is connected to the horizontal floor 120 at a predetermined position with bolts 18A, the bolt holes 41A and 42A of the third vertical plate 40A will overlap with the bolt holes 14A of the flat plate 12A and the bolt holes 24A of the flat plate 21, respectively. Then, by inserting bolt 16A through bolt holes 41A and 14A and tightening it with nut 16M, and by inserting bolt 17A through bolt holes 42A and 24A and tightening it with nut 17M, the flat plate 12A of the first vertical plate 10A and the flat plate 21 of the second vertical plate 20 are joined together and become one unit.

[0058] When the first vertical plate 10B is connected to the vertical wall 140 and the horizontal plate 30B is connected to the horizontal floor 120, the flat plate 12B of the first vertical plate 10B and the flat plate 23 of the second vertical plate 20 face each other in a line along a direction perpendicular to the vertical wall 140. The other third vertical plate 40B then acts as a bridge between the area of ​​the flat plate 12B of the first vertical plate 10B that faces the flat plate 23 of the second vertical plate 20 (-Z side) and the area of ​​the flat plate 23 of the second vertical plate 20 that faces the flat plate 12B of the first vertical plate 10B (+Z side), and is a flat plate that can be attached to and detached from the flat plates 12B and 23. The third vertical plate 40B has multiple bolt holes 41B drilled in it along the longitudinal direction of the vertical wall 140, which overlap with the multiple bolt holes 14B drilled in the flat plate 12B of the first vertical plate 10B. Furthermore, the third vertical plate 40B also has multiple bolt holes 42B drilled along the longitudinal direction of the vertical wall 140, which overlap with the multiple bolt holes 24B drilled in the flat plate 23 of the second vertical plate 20. When the flat plate 11B of the first vertical plate 10B is connected to the vertical wall 140 at a predetermined position with bolts 15B, and the horizontal plate 30B is connected to the horizontal floor 120 at a predetermined position with bolts 18B, the bolt holes 41B and 42B of the third vertical plate 40B will overlap with the bolt holes 14B of the flat plate 12B and the bolt holes 24B of the flat plate 23, respectively. Then, by inserting bolt 16B through bolt holes 41B and 14B and tightening it with nut 16N, and by inserting bolt 17B through bolt holes 42B and 24B and tightening it with nut 17N, the flat plate 12B of the first vertical plate 10B and the flat plate 23 of the second vertical plate 20 are joined together and become one unit.

[0059] In this way, the flat plate 12A of the first vertical plate 10A and the flat plate 21 of the second vertical plate 20 are joined using the third vertical plate 40A, and the flat plate 12B of the first vertical plate 10B and the flat plate 23 of the second vertical plate 20 are joined using the third vertical plate 40B, thereby the second vertical plate 20 is joined with the first vertical plates 10A and 10B to form a single unit.

[0060] If maintenance and inspection of the sand discharge door 500 and lubrication of the wire ropes 552A, 553A, 555A, and 556A are not required, the debris inflow prevention device 1 is left mounted on the workbench 110 so as to surround the opening 610. This ensures that even if the upstream water flows over the top 200 of the dam body 100 and along the inclined surface 300, debris flowing in with the water from upstream and debris already remaining on the inclined surface 300 are blocked by the second vertical plate 20, preventing this debris from flowing into the opening 610.

[0061] On the other hand, when performing maintenance and inspection of the sand discharge door 500 and lubrication work on the wire ropes 552A, 553A, 555A, and 556A, the bolts 16A and 17A are loosened to remove the third vertical plate 40A from the flat plate 12A of the first vertical plate 10A and the flat plate 21 of the second vertical plate 20, the bolt 18A is loosened to remove the horizontal plate 30A from the horizontal floor 120, the bolts 16B and 17B are loosened to remove the third vertical plate 40B from the flat plate 12B of the first vertical plate 10B and the flat plate 23 of the second vertical plate 20, the bolt 18B is loosened to remove the horizontal plate 30B from the horizontal floor 120, and the second vertical plate 20 that surrounded the opening 610 is removed from around the opening 610. This allows workers to efficiently and safely perform maintenance and inspection of the sand discharge door 500 and work on the wire ropes 552A, 553A, 555A, and 556A.

[0062] In particular, when looking down along the longitudinal direction of the vertical wall 140 at the area where the second vertical body 20 surrounds the opening 610, if the area of ​​the plane perpendicular to the longitudinal direction of the vertical wall 140 (the plane parallel to the XZ plane) is smaller than the area of ​​the opening 610, the sand discharge door 500 cannot be raised to a position above the horizontal floor 120 of the work platform 110 unless the dust inflow prevention device is removed. As a result, sufficient maintenance and inspection work on the sand discharge door 500 and sufficient lubrication work on the wire ropes 552A, 553A, 555A, and 556A cannot be performed. However, by adopting the debris inflow prevention device 1 of this embodiment, the second vertical plate 20 can be removed from around the opening 610, allowing the sand discharge door 500 to be raised to a position above the horizontal floor 120 of the workbench 110, making it possible to perform thorough maintenance and inspection work on the sand discharge door 500 and thorough lubrication work on the wire ropes 552A, 553A, 555A, and 556A. ===Summary=== As explained above, the dam body 100 includes a sloping surface 300 through which water mixed with debris flows on the upstream side beyond the crest 200, a sediment discharge port 400 for discharging sediment accumulated on the upstream riverbed 700 to the downstream side, a passage 600 extending between the sloping surface 300 and the sediment discharge port 400, and a sediment discharge door 500 that is lifted within the passage 600 when the sediment discharge port 400 is opened by wire ropes 552A, 553A, 555A, 556A connected through the opening 610 of the passage 600 on the sloping surface 400 side. A dust inflow prevention device 1 that surrounds the opening 610 of a passage 600, comprising: a pair of first vertical plates 10A, 10B coupled to a vertical wall 140 that extends vertically upstream of the opening 610 of the passage 600; a second vertical plate 20 adjacent to the vertical wall 140 and surrounding the opening 610 of the passage 600; and a pair of third vertical plates 40A, 40B that relay between the first vertical plates 10A, 10B and the second vertical plate 20 and are detachably coupled to the first vertical plates 10A, 10B and the second vertical plate 20.

[0063] Furthermore, in the debris inflow prevention device 1, the dam body 100 includes a horizontal floor 120 that extends horizontally around the periphery of the passage 600 except for the upstream side of the opening 610, and the lower side of the second vertical plate 20 is integrally formed with a pair of horizontal plates 30A and 30B that are detachably coupled to the horizontal floor 120.

[0064] Furthermore, in the dust inflow prevention device 1, the first vertical plates 10A and 10B are connected to both sides of the vertical wall 140 in the width direction, the second vertical plate 20 includes a pair of opposing regions that face the first vertical plates 10A and 10B respectively, the third vertical plate 40A connects the flat plate 12A of the first vertical plate 10A to the flat plate 21 of the second vertical plate 20, and the third vertical plate 40B connects the flat plate 12B of the first vertical plate 10B to the flat plate 23 of the second vertical plate 20.

[0065] Furthermore, in the dust inflow prevention device 1, the third vertical plates 40A and 40B are connected to the first vertical plates 10A and 10B and the second vertical plate 20 using bolts 16A, 16B, 17A, and 17B and nuts 16M, 16N, 17M, and 17N.

[0066] Furthermore, in the dust inflow prevention device 1, the first vertical plates 10A, 10B, the second vertical plate 20, and the third vertical plates 40A, 40B are formed of, for example, steel plates.

[0067] Furthermore, in the dust inflow prevention device 1, the horizontal floor 120 is formed, for example, by pouring concrete, and the horizontal plates 30A and 30B are formed, for example, from steel plates and are connected to the horizontal floor 120 using bolts 18A and 18B.

[0068] With the debris inflow prevention device 1, by removing the third vertical plate 40A from the flat plate 12A of the first vertical plate 10A1 and the flat plate 21 of the second vertical plate 20, and removing the third vertical plate 40B from the flat plate 12B of the first vertical plate 10B and the flat plate 23 of the second vertical plate 20, the second vertical plate 20 can be removed from around the opening 610, making it possible to efficiently and safely perform maintenance and inspection of the sand discharge door 500 and lubrication work on the wire ropes 552A, 553A, 555A, and 556A.

[0069] The above embodiments are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. The present invention may be modified or improved without departing from its spirit, and equivalents thereof are also included. [Explanation of symbols]

[0070] 1 Dust inflow prevention device 10A,10B 1st vertical plate 11A,11B,12A,12B flat plate 13A, 13B, 14A, 14B, 24A, 24B, 31A, 31B, 41A, 41B, 42A, 42B Bolt holes 15A, 15B, 16A, 16B, 17A, 17B, 18A, 18B bolts 16M, 16N, 17M, 17N nuts 20 Second vertical plate 21,22,23 flat plate 30A,30B,550,560 Horizontal board 40A,40B 3rd vertical plate 100 Embankment body 110 Workbench 120 horizontal floor 130 Winding stand 140 vertical wall 150 Slanted wall 160 Through hole 200 Top surface 300 Slope 400 Sand exhaust port 410 Sediment Removal Passage 500 Sand discharge door 510,520,530,540 vertical plate 531, 532, 541, 542 Rotating bodies 551,554 Pulley stand 552, 553, 555, 556 Pulleys 552A, 553A, 555A, 556A Wire Rope 600 aisles 610 Aperture 700 Riverbed 800 Winding device

Claims

1. The sloping surface on the upstream side, where water mixed with debris flows after crossing the crest, A first passage for discharging sediment accumulated on the upstream side of the riverbed to the downstream side, A second passage extending vertically between the inclined surface and the first passage, A sand discharge door is lifted up within the second passage when the first passage is opened by a wire rope connected through the opening of the second passage on the inclined surface side, A debris inflow prevention device surrounding the opening of the second passage in a dam body including, A first vertical plate is connected to a vertical wall extending vertically upstream of the opening of the second passage, A second vertical plate adjacent to the aforementioned vertical wall surrounds the opening of the second passage, A third vertical plate is provided, which acts as a relay between the first vertical plate and the second vertical plate and is detachably connected to the first vertical plate and the second vertical plate. A dust and debris inflow prevention device, including [specific component].

2. A dust inflow prevention device according to claim 1, The embankment includes a horizontal floor extending horizontally around the periphery, excluding the upstream side of the opening of the second passage. The lower side of the second vertical plate is integrally formed with a horizontal plate that is detachably connected to the horizontal floor. Dust inflow prevention device.

3. A dust inflow prevention device according to claim 1, The first vertical plate is connected in pairs to both sides of the vertical wall in the width direction, The second vertical plate includes a pair of opposing regions that are each opposite to the pair of first vertical plates, The third vertical plates are provided in pairs, with one of the third vertical plates connecting one of the first vertical plates and one of the opposing regions of the second vertical plate, and the other of the third vertical plates connecting the other of the first vertical plate and the other of the opposing regions of the second vertical plate. Dust inflow prevention device.

4. A dust inflow prevention device according to claim 1, The third vertical plate is connected to the first vertical plate and the second vertical plate using a plurality of bolts. Dust inflow prevention device.

5. A dust inflow prevention device according to claim 1, The first to third vertical plates are formed of steel plates. Dust inflow prevention device.

6. A dust inflow prevention device according to claim 2, The aforementioned horizontal floor is made of concrete. The horizontal plate is made of steel plate and is attached to the horizontal floor using bolts. Dust inflow prevention device.

7. The sloping surface on the upstream side, where water mixed with debris flows after crossing the crest, A first passage for discharging sediment accumulated on the upstream side of the riverbed to the downstream side, A second passage extending vertically between the inclined surface and the first passage, A sand discharge door is lifted up within the second passage when the first passage is opened by a wire rope connected through the opening of the second passage on the inclined surface side, A method for preventing debris from flowing into the opening of the second passage in a dam body including, The first vertical plate is connected to a vertical wall extending vertically upstream of the opening of the second passage, The second vertical plate is used to surround the opening of the second passage adjacent to the vertical wall, By detachably connecting the third vertical plate, which acts as a relay between the first vertical plate and the second vertical plate, to the first vertical plate and the second vertical plate, the inflow of dust and debris into the opening of the second passage is prevented. Method for preventing inflow of dust.

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