JP2020045755A - River flooding prevention device - Google Patents

Abstract

To provide a river flooding prevention device which can surely control a water level in flooding to be high, to a water level that is safer and lower, and thereby can achieve improvement of safety in concentrated torrential rainfall.SOLUTION: Provided is a river flooding prevention device in which a flow channel having a longitudinal side directed from an upstream side toward a downstream side is formed inside an inner wall of a river bed or a river reservation through which river water flows in flooding, an introduction path having an introduction port opened on the inner wall is provided on an end on the upstream side of the flow channel, and the introduction port is provided with an openable/closable shutter and driving means for driving opening/closing of the shutter. On the upstream side than the introduction port in the inner wall, a control screen that regulates a flow to the introduction port of a flow-down matter in standing and can flow the river water is provided to rise and fall freely in conjunction with the shutter opened when a water level reaches a constant water level or higher in flooding.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a river flood prevention device.

  In the past, heavy rainfall has caused heavy flood damage due to the flooding of rivers flowing through the area. In order to eliminate such damages, flood damage prevention methods as disclosed in Patent Documents 1 and 2 have been proposed.

JP-A-4-30011 JP 2015-187375 A

The technology disclosed in Patent Literature 1 is one of river rehabilitation works, which relates to a river culvert facility for enlarging a substantially effective cross section of a river so that a planned high water flow rate of the river can safely flow down during a flood. A culvert of a required length is formed in the lower part of the riverbed along the flow direction of the river water, and weir structures are constructed at the upstream end and the downstream end of the culvert, respectively. And a flow rate control gate for opening and closing the entrance section and the exit block of the culvert, respectively.
According to this river culvert facility, it appears that the culvert can enlarge the effective cross section of the river and prevent flooding of the river, but it is normally closed as shown in FIG. A large amount of inflowing material accumulates in the recess for introduction in front of the gate, and the introduction efficiency at the time of the important flood may deteriorate, and the original flood prevention effect may not be exhibited. In addition, at the time of the important flood, FIG. As shown in (B), since the entrance portion is opened directly in the direction of the flow of the flood, there is a possibility that the falling material may be directly caught or clogged there.
The technology disclosed in Patent Literature 2 is intended to improve the safety during a torrential rain by enabling the water level at the time of flooding, which will be high, to be controlled to a safer low water level. A river characterized by forming a flow passage extending longitudinally from the upstream side to the downstream side in the riverbed through which the river water flows, and allowing the inlet on the upstream side of the flow passage to be opened and closed with a shutter that opens when necessary. It is a flood prevention device.
This river flood prevention device is designed to open the shutter at the time of flooding to temporarily guide the river water into the flow channel through the inlet to control the height of the flood to be low. A plurality of protective piles are erected around the building and shield screens are stretched around the protective piles so that the entrance is not blocked by drifting objects such as pleasure boats such as houseboats and drift stones. It is.
However, in this case, the protective piles are always standing and fixed, so that during run-off during floods and during the initial stages of floods, the spillage remains in front of them, and the shutter must be opened during important floods. However, it was not possible to introduce the flowing water efficiently through the inlet, and it was not possible to reduce the water level, and there was a risk of flooding.

  The present invention is intended to solve the above-described problem, and it is possible to improve the safety during a torrential rain by ensuring that the water level at the time of flood, which will be high, can be controlled to a safer low water level. It is an object of the present invention to provide a river flood prevention device capable of being used.

  In order to achieve the above object, the invention according to claim 1 forms a flow path whose length is directed from an upstream side to a downstream side in an inner wall of a riverbed or a riverbed where river water flows during a flood, and At the upstream end of the flow path, there is provided an introduction path having an opening formed in the inner wall, and the introduction opening is provided with a shutter which can be opened and closed and a driving means for driving the shutter to open and close. A control screen for controlling the flow of the falling material to the inlet at the time of erecting and enabling the flow of river water at an upstream side of the inlet on the inner wall, the control screen reaching a certain level at the time of flooding It is characterized in that it is provided so that it can be turned upside down in conjunction with a shutter that opens when the shutter is opened.

  As described above, the invention according to claim 1 forms a flow path whose length is directed from the upstream side to the downstream side in an inner wall of a riverbed or a riverbed where river water flows during a flood, and the upstream side of the flow path. At the end of the river flooding prevention device provided with an introduction path with an introduction opening in the inner wall, the introduction opening is provided with a shutter that can be opened and closed and a driving unit that opens and closes the shutter. On the upstream side of the inlet on the inner wall, a shutter that opens when the control screen reaches a certain level at the time of flooding, which regulates the flow of the falling material to the inlet when standing up and allows the flow of river water. It is characterized by being provided so that it can be moved up and down in tandem with the water, so that the water level during floods, which will be high, can be controlled to a safer low water level to ensure safety during heavy rainfall Can be improved It is possible to provide a river flood prevention apparatus which so that.

  1 is a river plan view showing a river flood prevention device according to an embodiment of the present invention.   FIG. 2 is a sectional view taken along line II-II of FIG. 1.   Sectional drawing explaining operation | movement of the apparatus of FIG.   FIG. 4 is a sectional view taken along line IV-IV of FIG. 1.   FIG. 5 is a sectional view taken along line VV of FIG. 1.   Sectional drawing which shows another embodiment.   FIG. 7 is a sectional view illustrating the operation of the embodiment in FIG. 6.   FIG. 9 is a cross-sectional view of the apparatus showing another embodiment.   River plan view showing another embodiment.   XX sectional drawing of FIG.   Sectional drawing which shows operation | movement of the embodiment of FIG.   FIG. 12 is a perspective view showing the screen of FIG. 11.   River plan view showing another embodiment.   FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13.   FIG. 15 is a sectional view illustrating the operation of the embodiment in FIG. 14.

Hereinafter, an embodiment of a river flood prevention device of the present invention will be described with reference to FIGS.
FIG. 1 shows a bird's-eye view of a river (part) 3 flowing from the right upstream side 1 to the left downstream side 2 and its surroundings, and this river flood prevention device is empirically necessary. It is a part of the section described as follows. The section may be a curved section of high risk of flooding of the river. In the river 3, a riverbed (low waterbed) 5 through which river water flows in normal times when the amount of water is small, and riverbeds (high waterbeds) 6 and 6 slightly higher on both sides thereof are formed, and further away from both sides. Is formed with embankments 7,7 which are considerably higher than the riverbed 6. Here, the surface portions of the riverbed 5 and the riverbeds 6 and 6 are called inner walls a, and in the case of the embodiment in which the river flood prevention device is provided on the embankment 7, the inner wall of the embankment 7 becomes the inner wall a. 7a is the top of the embankment 7.

  Inside the inner wall a of the riverbed 5, a flow path 10 whose length is directed from the upstream side to the downstream side is formed. The flow channel 10 is formed by burying a large number of rectangular horizontal culverts 11 each having a length of A × B and a length of L in the inner wall a in a state of being connected to each other in the front-rear direction. When the width is large, a plurality of rows may be arranged in the width direction as shown in the upper right column of FIG. The number of arrangements differs depending on the width of the riverbed 5 and the like. The culverts 11 may be arranged in one row or a plurality of rows on the left and right, and in that case, they may be arranged in a plurality of rows above and below. A muddy inner wall a is formed on the culvert 11. However, the upper surface of the culvert may be exposed so as to be flush with the upper surface of the riverbed 5.

  At the upstream end of the flow path 10, an introduction path 14 having an introduction port 13 opened in the inner wall a is provided. The introduction path 14 is formed in the oblique culvert 15 connected to the front end of the flow path 10, and has a stepped portion lower than the inner wall a at the rectangular inner peripheral edge of the introduction port 13 formed at the upper end of the introduction path 14. Are formed. A shutter 17 made of SUS, aluminum alloy, titanium, reinforced resin, or the like and having a rectangular plate shape is fitted into the step portion so as to seal the inlet 13 through a sealing material (not shown). After being provided at the end, it is tilted forward by 45 degrees via a hinge 18 so as to be capable of standing up and down. The drive means 19 for raising and lowering the shutter 17 is a fluid cylinder of water, oil, air or the like. The base is attached to the front end of the flow passage 10 and the tip of the rod is attached to the back of the shutter 17. The drive means 19 is a pair of left and right, but may be a single drive means.

  At the front of the oblique culvert 15, an oblique rectangular tubular front culvert 21 is formed integrally or separately, and the inside thereof is formed as a pocket 22 for collecting a falling material. A sewage drain 23 is provided below the front end wall of the diagonal culvert 15 to make it easier for the falling material to enter the pocket 22, but may be omitted.

At the upper end of the front culvert 21, a rectangular trapping guide port 25 is formed, and at the rear end of the trapping guide port 25, a front hinge 26 is provided. A control screen 27 having a rectangular outer shape is provided via the front hinge 26. The control screen 27 has a main body having a front and rear frame portion and a pair of left and right frame portions and having a plurality of (six in the example in the figure) intermediate vertical bars between the left and right frame portions. A plurality of openings 27a are formed between the pair of left and right frame portions and the plurality of intermediate vertical rail portions, and these openings 27a are openable and closable by a single lid 29 on the upper side. is there.
In normal times, the control screen 27 with the lid 29 closes the capture guide port 25, so that when the river flows, as in the normal times in FIGS. 3 and clogging in the pocket 22. As a result, when the control screen 27 rises as shown in FIG. There is no risk that the flow to 10 will be impaired.
On the other hand, if a large number of fence-shaped screens 27 are left as they are without the lid 29 as shown in the lower column of FIG. When the control screen 27 with the falling-off material X is attached at the time of the flood as in 3, the falling-off material X, etc. attached to the control screen 27 is brought to the inlet 13 side by the flow of the river water from the front, and is brought into the opening. There is a danger that the flow will flow to the flow path 10 due to hanging and clogging.
The whole of FIG. 2, for example, the riverbed 5, the channel 10, and the like, are gradually lowered and inclined in the direction of the estuary, which is the left direction in FIG. 2.

  Between the shutter 17 and the control screen 27, a pair of left and right links 31 for linking them are provided. Reference numeral 32 denotes an anchor formed by a link chain or the like for keeping the rising angle of the control screen 27 constant. The driving means 19 may be attached to the control screen 27 side. The control screen 27 rises at 45 degrees, but may rise as low as about 30 degrees (see FIG. 7). An openable shutter is provided downstream of the flow path 10 to prevent backflow from the estuary. In the river flood prevention device, as shown in FIG. 3, the water flow velocity may be accelerated by an air or water jet injection type acceleration device 34. The acceleration device 34 may be an electrically driven axial fan type or A screw shaft type may be used. The culverts 11 may be configured so that part or all of them can be opened and closed so that they can be opened after a flood to facilitate maintenance.

  FIG. 1 and FIG. 2 show the state of the river flood prevention device in a normal river state. In this case, since the shutter 17 and the control screen 27 are both in the closed state, there is no problem that the river water W enters the channel 10 or the pocket 22 and becomes clogged, so that the flow cannot be secured at the time of the essential flood. In addition, since the shutter 17 and the control screen 27 are closed to be in a horizontal state, there is no danger that the falling objects X at the initial stage of the flood will stay, not only during normal times. Even if the shutter 17 is opened in the normal time or in the initial stage of the flood, the control screen 27 rises in front of the shutter 17 and captures and collects the flowing-down material X. Absent. It is to be noted that, in the upper surface of the shutter 17 and the screen 27, there is a possibility that flowing-down materials X, such as mud and branch trees, accumulate from normal times. There is a danger that they need to be cleaned and removed during normal times when floods do not occur.

  On the other hand, the flood sign levels include an evacuation determination water level (level 3) and a flood caution water level (level 2) before the flood danger water level (level 4). In this embodiment, the water level is determined by the shutter 17 and the control. When the evacuation determination water level (level 3), which is a level of 1 to 2 m, exceeds the rising height H of the screen 27, the shutter 17 and the control screen 27 are raised and driven. In this case, since the water level exceeds the control screen 27, the falling objects X, such as driftwood, flowing along with the river water W are less likely to be caught on the control screen 27, and the river water flows into the inlet 13 through the eyes of the control screen 27. W is easily introduced.

However, when the risk of flooding is very high, such as when record short-term heavy rain information is issued, it is early to prepare to start the shutter 17 etc. at an early stage. In preparation, a large amount of river water mixed with mud, branches, etc. may flow into the flow path 10, and if the water level does not reach the dangerous level as a result, the flow path after the flood In consideration of the fact that it is necessary to perform a recovery operation such as an operation to remove the mud in the inside 10 and the inflowing material X accumulated in front of the screen 27, which is a difficult operation, the water level is more than a certain level (a flood risk water level). It is necessary to select a point that reaches the point (1) as a suitable startup timing.
When the water level gradually rises due to the flood and the shutter 17 and the control screen 27 are erected, there is no problem because the falling objects X flowing through the high water level are guided to the downstream side at a much higher part of the control screen 27, but there is no problem. , Flowing down below the height H, are caught by the control screen 27 and collected in the pocket 22, and the river water W that has passed through the control screen 27 is thus collected. Is guided to flow from the inlet 13 into the flow channel 10. As a result, the water level corresponding to the amount of water guided to the flow path 10 is reduced as shown by the imaginary line in FIG. 5, and the risk of flooding is significantly reduced. An outlet shutter (not shown) provided at the downstream end of the flow passage is provided near or before the estuary of the extended flow passage 10 so as to prevent backflow. It should be opened after a certain time, which prevents backflow.
The shutter 17 may be adjusted to be half-opened in the first stage and fully opened in the second stage, for example, in addition to being opened forward at once. In the case of horizontal arrangement as shown in the upper right column of FIG. 5, for example, the shutter 17 on one or both sides may be opened first, and then the central shutter 17 may be additionally opened. it can.

  6 and 7 show another embodiment. This embodiment is a simplified device in which the front culvert 21, the pocket 22, the lid 29, etc. of the above embodiment are omitted. That is, FIG. 6 shows the state of a river (part) 3 and its surroundings which are made to flow from the right upstream side 1 to the left downstream side 2, and this river flood prevention device is empirically necessary. It is a part of the section described as follows. The section may be a curved section of high risk of flooding of the river. In the river 3, a riverbed (low waterbed) 5 through which river water flows in normal times when the amount of water is small, and riverbeds (high waterbeds) 6 and 6 slightly higher on both sides thereof are formed, and further away from both sides. Is formed with embankments 7,7 which are considerably higher than the riverbed 6. Here, the surface portions of the riverbed 5 and the riverbeds 6 and 6 are called inner walls a, and in the case of the embodiment in which the river flood prevention device is provided on the embankment 7, the inner wall of the embankment 7 becomes the inner wall a. 7a is the top of the embankment 7.

  Inside the inner wall a of the riverbed 5, a flow path 10 whose length is directed from the upstream side to the downstream side is formed. The flow channel 10 is formed by burying a large number of rectangular horizontal culverts 11 each having a length of A × B and a length of L in the inner wall a in a state of being connected to each other in the front-rear direction. When the width is large, a plurality of rows may be arranged in the width direction as shown in the upper right column of FIG. The number of arrangements differs depending on the width of the riverbed 5 and the like. The culverts 11 may be arranged in one row or a plurality of rows on the left and right, and in that case, they may be arranged in a plurality of rows above and below. A muddy inner wall a is formed on the culvert 11. However, the upper surface of the culvert may be exposed so as to be flush with the upper surface of the riverbed 5.

  At the upstream end of the flow path 10, an introduction path 14 having an introduction port 13 opened in the inner wall a is provided. The introduction path 14 is formed in the oblique culvert 15 connected to the front end of the flow path 10, and has a stepped portion lower than the inner wall a at the rectangular inner peripheral edge of the introduction port 13 formed at the upper end of the introduction path 14. Are formed. Into the step portion, a rectangular plate-shaped shutter 17 selected from SUS, aluminum alloy or titanium, reinforced resin, or the like is fitted to seal the inlet 13 through a sealing material (not shown). After being provided at the rear end on the downstream side, it is provided so as to be capable of standing up and down by 30 ° (or 45 °) forward via a hinge 18. The drive means 19 for raising and lowering the shutter 17 is a fluid cylinder of water, oil, air or the like. The base is attached to the front end of the flow passage 10 and the tip of the rod is attached to the back of the shutter 17. The drive means 19 is a pair of left and right, but may be a single drive means.

  In the above-described embodiment, the front culvert 21 is provided at the front of the oblique culvert 15, and the inside thereof is the pocket 22 for collecting the falling material. However, in this embodiment, these 21, 22 and the like are omitted. It has been simplified.

    A front hinge 26 is provided at a position slightly forward of the front end of the oblique culvert 15, and a control screen 27 having a rectangular outer shape is provided via the front hinge 26. The control screen 27 is formed by a frame using a long band plate, has front and rear frame portions and a pair of left and right frame portions, and has a plurality of (eight in the illustrated example) intermediate between the left and right frame portions. It has a main body with a vertical cross section. The control screen 27 does not include the lid 29 as in the above-described embodiment, and remains as a fence. A plurality of openings 27a are formed between the pair of left and right frame portions and the plurality of intermediate vertical rail portions. Below the control screen 27 in FIG. 6 is an inner wall portion corresponding to the front of the inlet 13 of the riverbed 5.

  Between the shutter 17 and the control screen 27, a pair of left and right links 31 for linking them are provided. An anchor 32 (see FIG. 3) such as a link chain may be provided to keep the rising angle of the control screen 27 constant. The anchor 32 may be extended between the control screen 27 and the riverbed 5. An openable shutter is provided downstream of the flow path 10 to prevent backflow from the estuary. In the river flood prevention device, the water flow velocity may be accelerated by an air or water jet injection type acceleration device 34, as shown in FIG. Alternatively, a screw shaft type may be used. The culverts 11 may be configured so that part or all of them can be opened and closed so that they can be opened after a flood to facilitate maintenance.

In normal times, the shutter 17 closes the inlet 13 and the control screen 27, which is a fence-like body, is lying down on the riverbed 5 in front of the shutter 13. There is no drip or clogging in the flow path 10.
Before the river reaches the flood danger level, the shutter 17 is opened. At the same time, the control screen 27 is started up. 13 so that only river water is guided.

  The culverts 11 may be arranged on both left and right sides (or one side) of the riverbed 5 or in correspondence with the riverbed 6, as shown in the cross-sectional view of the river in FIG. When the culvert 11 is passed away from the vicinity of the center of the riverbed 5 in this way, the construction can be performed while flowing the river water during the normal time to the center of the riverbed 5, so that the work can be performed easily and the construction period can be shortened and cheap. In addition, if the culverts 11 are arranged on both sides (or one side), the level of the flood basin where the risk is highest when flooding is attempted can be reduced, and the effect of flood prevention becomes effective. When the culvert 11 is provided on the riverbed 6, the position of the shutter 31 is on the upper inner surface or the top surface. Further, the flow channel 10 may be formed by connecting the culvert 11 to one or both of the river embankments 7. In the case where the culvert 11 is arranged on one side of the river embankment 7, the side on the left or right where the possibility of flooding is high is selected. In this case, a shutter 31 is provided on the upper inner surface 11a of the culvert 11 to take in river water at a dangerous water level.

  FIG. 9 to FIG. 12 show another embodiment, in which a falling object X, such as a driftwood, passes over the control screen without hanging over it, so that the river water W can easily pass through and is guided by the channel reliably. That's what I did. That is, FIG. 9 shows the state of a river (part) 3 and its surroundings which are made to flow from the right upstream side 1 to the left downstream side 2, and this river flood prevention device is empirically necessary. It is a part of the section described as follows. The section may be a curved section of high risk of flooding of the river. In the river 3, a riverbed (low waterbed) 5 through which river water flows in normal times when the amount of water is small, and riverbeds (high waterbeds) 6 and 6 slightly higher on both sides thereof are formed, and further away from both sides. Is formed with embankments 7,7 which are considerably higher than the riverbed 6. Here, the surface portions of the riverbed 5 and the riverbeds 6 and 6 are called inner walls a, and in the case of the embodiment in which the river flood prevention device is provided on the embankment 7, the inner wall of the embankment 7 becomes the inner wall a.

  Inside the inner wall a of the riverbed 5, a flow path 10 whose length is directed from the upstream side to the downstream side is formed. The flow channel 10 is formed by burying a large number of rectangular horizontal culverts 11 each having a length of A × B and a length of L in the inner wall a in a state of being connected to each other in the front-rear direction. When the width is large, a plurality of rows may be arranged in the width direction as shown in the upper right column of FIG. The number of arrangements differs depending on the width of the riverbed 5 and the like. The culverts 11 may be arranged in one row or a plurality of rows on the left and right, and in that case, they may be arranged in a plurality of rows above and below. A muddy inner wall a is formed on the culvert 11. However, the upper surface of the culvert may be exposed so as to be flush with the upper surface of the riverbed 5.

  At the upstream end of the flow path 10, an introduction path 14 having an introduction port 13 opened in the inner wall a is provided. The introduction path 14 is formed in the oblique culvert 15 connected to the front end of the flow path 10, and has a stepped portion lower than the inner wall a at the rectangular inner peripheral edge of the introduction port 13 formed at the upper end of the introduction path 14. Are formed. Into the step portion, a rectangular plate-shaped shutter 17 selected from SUS, aluminum alloy or titanium, reinforced resin, or the like is fitted to seal the inlet 13 through a sealing material (not shown). After being provided at the rear end on the downstream side, it is provided so as to be capable of standing up and down by 30 ° (or 45 °) forward via a hinge 18. The drive means 19 for raising and lowering the shutter 17 is a fluid cylinder of water, oil, air or the like. The base is attached to the front end of the flow passage 10 and the tip of the rod is attached to the back of the shutter 17. The drive means 19 is a pair of left and right, but may be a single drive means.

  The control screen 40 is formed of a number of vertical rails 41 and a connecting horizontal rail 42 on the back side, and is configured as a member that restricts the passage of the falling material X and allows the passage of the river water W, and the downstream side thereof. The rear end is connected to the upstream front end of the shutter 17 via a front hinge 43. At the front end of the control screen 40, a movable roller 44 that is movable on the riverbed 5 is provided. The control screen 40 is lifted together with the shutter 17 and falls forward, and its inclination angle is a gentle rising angle of 15 degrees between the riverbed 5 and the falling object such as driftwood as shown in FIG. X crosses the downstream side rearward with the flow of the flood W, so that the possibility of clogging of the control screen 40 is reduced, whereby the river water W easily passes through the control screen 40 and the flow path 10 Guidance can be obtained reliably. The vertical rail 41 may be of a link chain type as shown in the lower right column of FIG. 11 in addition to the band plate shape as shown in FIG. Further, as shown in the right column of FIG. 12, the control screen 40 may have a corrugated shape to make it difficult for the falling objects X to pass therethrough. The timing of lifting the control screen 40 is as described in the above embodiment. The opening timing of the shutter 17 is preferably before the flood danger level, but may be higher than the evacuation determination level. Below the control screen 40 in FIG. 10 is an inner wall portion corresponding to the front of the inlet 13 of the riverbed 5.

13 to 15 show another embodiment. In this embodiment, the shutter 47 is opened rearward in the horizontal direction, and the control screen 48 rises obliquely rearward in conjunction with the movement.
That is, FIG. 13 shows a river (part) 3 that flows from the right upstream side 1 to the left downstream side 2 and its surroundings. This river inundation prevention device is empirically necessary. It is a part of the section described as follows. The section may be a curved section of high risk of flooding of the river. In the river 3, a riverbed (low waterbed) 5 through which river water flows in normal times when the amount of water is small, and riverbeds (high waterbeds) 6 and 6 slightly higher on both sides thereof are formed, and further away from both sides. Is formed with embankments 7,7 which are considerably higher than the riverbed 6. Here, the surface portions of the riverbed 5 and the riverbeds 6 and 6 are called inner walls a, and in the case of the embodiment in which the river flood prevention device is provided on the embankment 7, the inner wall of the embankment 7 becomes the inner wall a.

  Inside the inner wall a of the riverbed 5, a flow path 10 whose length is directed from the upstream side to the downstream side is formed. The flow channel 10 is formed by burying a large number of rectangular horizontal culverts 11 each having a length of A × B and a length of L in the inner wall a in a state of being connected to each other in the front-rear direction. When the width is large, a plurality of rows may be arranged in the width direction as shown in the upper right column of FIG. The number of arrangements differs depending on the width of the riverbed 5 and the like. The culverts 11 may be arranged in one row or a plurality of rows on the left and right, and in that case, they may be arranged in a plurality of rows above and below. A muddy inner wall a is formed on the culvert 11. However, the upper surface of the culvert may be exposed so as to be flush with the upper surface of the riverbed 5.

  At the upstream end of the flow path 10, an introduction path 14 having an introduction port 13 opened in the inner wall a is provided. The introduction path 14 is formed in the oblique culvert 15 connected to the front end of the flow path 10, and has a stepped portion lower than the inner wall a at the rectangular inner peripheral edge of the introduction port 13 formed at the upper end of the introduction path 14. Are formed. Into the step portion, a rectangular plate-shaped shutter 17 selected from SUS, aluminum alloy or titanium, reinforced resin, or the like is fitted to seal the inlet 13 through a sealing material (not shown). After being provided at the rear end on the downstream side, it is provided so as to be capable of standing up and down by 30 ° (or 45 °) forward via a hinge 18.

  A guide 49 for moving the shutter 47 forward and backward is provided at a position corresponding to the rear of the inlet 13 of the riverbed 5, and a driving means (cylinder) 50 for moving the small-diameter sprocket 47 is moved along the space above the culverts 11. The shutter 47 is provided so as to face forward and backward to drive the shutter 47 forward and backward. The control screen 48 waits forward and horizontally via a rear hinge 51, and rises forward between a first hinge 54 of a projecting piece 53 protruding from an upper surface of the screen 48 and a second hinge 55 at the front end of the shutter 47. It is connected and connected by an interlocking link 56. The control screen 48 includes vertical rails 48a and horizontal rails 48b.

  For example, when the water reaches the evacuation determination water level (level 3) or between the evacuation determination water level (level 3) and the flood danger level (level 4) from the normal state of FIG. , And the inlet 13 is opened. Therefore, when the shutter 47 is pulled backward, the control screen 48 is turned backward through the interlocking link 56, and the control screen 48 is stopped at about 45 degrees (or 30 degrees). The falling objects X flow at the upper level of the river water W flowing over the control screen 48, but may flow at a low level corresponding to the control screen 48 in some cases. Thus, the river water W easily passes through the control screen 48 and flows downstream from the inlet 13 through the flow path 10 while flowing over the control screen 48 as shown by the arrow.

  DESCRIPTION OF SYMBOLS 1 ... Upstream side 2 ... Downstream side 3 ... River 5 ... Riverbed (low floor) 6 ... Riverbed (high floor) 7 ... Embankment a ... Inner wall 10 ... Flow path 13 ... Inlet 14 ... Introductory path 17, 47 ... Shutter 19, 50: driving means 27, 40, 48: control screen W: river water (flood) X: falling objects such as driftwood and vegetation.

Claims (1)

  A flow passage whose length is directed from the upstream side to the downstream side is formed inside an inner wall such as a riverbed or a riverbed through which river water flows during a flood, and an inlet is formed in the inner wall at the upstream end of the flow passage. A river flood protection device comprising an introduction path and a shutter that can be opened and closed at the introduction port and a drive unit that opens and closes the shutter. Controls the flow of inflowing substances to the inlet and enables the flow of river water.The control screen is provided so that it can move up and down in conjunction with the shutter that opens when the water level reaches a certain level during floods. A feature for preventing river flooding.