Capturing structure for drift

Abstract

To provide a capturing structure for a drift capable of capturing the drift contained in water before a water level exceeds a height of a waterproof structure.SOLUTION: A capturing structure 1 for a drift 12 at a cut-off wall 2 which is a waterproof structure formed so as to surround a structure 5 includes: an openable / closable movable gate 3 provided at an upper part of the cut-off wall 2; and a drift capturing part 4 provided so as to surround the movable gate 3 in a plan view at a back surface side of the cut-off wall 2, and having a capturing mechanism 6 through which water can pass but which captures the drift 12 of a predetermined size or larger. In the capturing structure 1, when the movable gate 3 is opened, an opening part 14 is formed at a position lower than a height 17 of a portion 2a other than the movable gate 3 of the cut-off wall 2, and water can flow into the drift capturing part 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure for capturing driftwood. [Background technology]

[0002] In recent years, severe flooding has become more frequent due to climate change, and in order to protect structures located in areas at high risk of flooding, there has been an increase in the installation of floodproof walls (waterstop walls) around the perimeter of sites (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-18892 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if a flood occurs that exceeds expectations and the water depth exceeds the height of the water cutoff wall, a large amount of driftwood, such as garbage, will flow into the site along with the water that has passed through the city. In this case, garbage will be scattered all over the site after the flood, and cleaning work will become a heavy burden. Recently, there has also been an increase in inland flooding, where rainwater backs up from the sewer system, and water that has passed through unexpected areas may flow in.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a driftwood capture structure that can capture driftwood contained in water before the water level exceeds the height of the waterproof structure. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention is a driftwood capture structure in a waterproof structure installed at a predetermined height, comprising a movable gate that is installed on the upper part of the waterproof structure and can be opened and closed, and a driftwood capture section that is installed on the back side of the waterproof structure, surrounding the movable gate in a planar view, and has a capture mechanism that allows water to pass through but captures driftwood of a predetermined size or larger, characterized in that when the movable gate is opened, an opening is formed at a position lower than the height of the parts of the waterproof structure other than the movable gate, making it possible to allow water to flow into the driftwood capture section.

[0007] In the present invention, a driftwood capture section is provided on the back side of the waterproof structure to surround the movable gate, and when the openable and closable movable gate provided on the top of the waterproof structure is opened, an opening is formed at a position lower than the height of the waterproof structure, so that water can flow in through the opening and driftwood contained in the water can be captured by the driftwood capture section before the water level exceeds the height of the waterproof structure.

[0008] It is desirable for the waterproof structure to have a control unit that opens and closes the movable gate, and for the control unit to open the movable gate when the water level on the front side of the waterproof structure is higher than the lower end of the movable gate and lower than the height of parts of the waterproof structure other than the movable gate. This allows the movable gate to be opened safely in the event of flooding.

[0009] In the driftwood capture section, it is desirable that the capture mechanism can be raised or erected in conjunction with the opening of the movable gate. This allows the capture mechanism to be managed in a state where it does not interfere with traffic during normal times, and can be raised or erected for use in the event of flooding.

[0010] It is preferable that the capture mechanism be detachable from the waterproof structure. This allows the capture mechanism to be stored elsewhere during normal times, and to be attached to the waterproof structure for use in the event of a flood.

[0011] The capture mechanism may be formed in multiple stages, and the size of the driftwood to be captured may become gradually smaller from the waterproof structure side. This allows driftwood of various sizes to be separated and captured.

[0012] The waterproof structure is desirably a water blocking wall formed to surround the structure. This will prevent driftwood from being scattered within the structure's premises after a flood.

[0013] The waterproof structure may be a closed section of a dam, a ring dam, or a double dam. This will prevent driftwood from being scattered in fields and other areas behind the dike after a flood. Effect of the Invention

[0014] According to the present invention, a driftwood capturing structure can be provided that can capture driftwood contained in water before the water level exceeds the height of the waterproof structure. [Brief description of the drawings]

[0015] [Figure 1] FIG. [Diagram 2] 2(a) is a cross-sectional view taken along line AA in FIG. 1, and (b) is a view seen from the direction of arrow B in FIG. [Diagram 3] 2(a) is a cross-sectional view taken along line AA in FIG. 1, and (b) is a view seen from the direction of arrow B in FIG. [Figure 4] 1A is a diagram showing a vertical cross section of the water stop wall 2 with the movable gate 3a closed, and FIG. 1B is an elevation view of the driftwood capture section 4a. [Diagram 5] FIG. 1 shows the capture structure 1a with the movable gate 3a open. [Figure 6] A diagram showing a river 15 in which a capture structure 1b is installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [First embodiment] Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 is a plan view of a capture structure 1 according to a first embodiment of the present invention. Figure 2 shows the capture structure 1 with the movable gate 3 open. Figure 3 shows the capture structure 1 with the movable gate 3 closed.

[0017] 1 to 3, a watertight wall 2, which is a waterproof structure, is formed to surround a structure 5 (such as a facility that is to be flood-prevented). The watertight wall 2 is provided to prevent water from entering from a front surface 22 side to a back surface 21 side, and a height 17 from the ground surface 10 to the top end of the watertight wall 2 is approximately 2 m. The front surface 22 of the watertight wall 2 is the surface that does not face the structure 5, and the back surface 21 is the surface that faces the structure 5.

[0018] The driftwood capture structure 1 is provided at least in one location on the waterstop wall 2. Because water may surge in from multiple directions due to flooding from multiple rivers or inland flooding, when the capture structures 1 are provided at multiple locations on the waterstop wall 2, it is preferable to set the intervals between them at about 10 to 50 m. It is preferable to preferentially place the capture structures 1 in an area where the water level 13 on the front side 22 is relatively high, based on a flood occurrence rate around the waterstop wall 2 and a flood damage simulation based on topographical data.

[0019] The capture structure 1 includes a movable gate 3, a driftwood capture section 4, a scour prevention structure 11, and the like. The movable gate 3 is provided on the upper part of the waterstop wall 2. The movable gate 3 is connected to the waterstop wall 2 by a hinge 8, and opens and closes by rotating at the hinge 8. When the movable gate 3 is closed, as shown in FIG. 2, the upper end of the movable gate 3 is at a height substantially equal to the upper end of the portion 2a of the waterstop wall 2 other than the movable gate 3. When the movable gate 3 is opened, as shown in FIG. 3, the movable gate 3 falls toward the back surface 21 of the waterstop wall 2, and an opening 14 is formed at a position lower than the height 17 of the portion 2a of the waterstop wall 2 other than the movable gate 3. The movable gate 3 is supported by a bracket 9 fixed to the back surface 21 of the waterstop wall 2, for example.

[0020] The driftwood capture section 4 is composed of a capture mechanism 6, a pillar 7-1, a float 7-2, etc. The capture mechanism 6 is made up of a wire 6-1 and a wire mesh 6-2. The wire mesh 6-2 is installed on the back surface 21 side of the waterstop wall 2 so as to surround the movable gate 3 in a plan view. The wire 6-1 is installed so as to divide the area surrounded by the wire mesh 6-2 into two parts, one close to the waterstop wall 2 and one far from it. In other words, the capture mechanism 6 is formed in two stages by the wire 6-1 and the wire mesh 6-2.

[0021] In the driftwood capturing unit 4, a wire 6-1 and a wire mesh 6-2 are attached to a pole 7-1. A float 7-2 is attached to the upper end of the part of the wire mesh 6-2 that is farthest from the water blocking wall 2. When most of the pole 7-1 of the driftwood capturing unit 4 is stored below the ground surface 10 as shown in FIG. 2(a), the capturing mechanism 6 is folded up near the ground surface 10. When the pole 7-1 is raised as shown in FIG. 3(a), the capturing mechanism 6 is raised and spreads out vertically. In the state shown in FIG. 3(a), the distance between the wires 6-1 is, for example, about 5 to 15 cm, and the mesh size of the wire mesh 6-2 is, for example, about 5 cm.

[0022] The scour prevention structure 11 is disposed on the ground surface 10 on the back surface 21 side of the water cutoff wall 2. The scour prevention structure 11 is formed by paving the ground surface 10, for example.

[0023] In the capture structure 1, the movable gate 3 is kept closed under normal circumstances. In the event of flooding, the capture mechanism 6 is raised to the state shown in FIG. 3(a) and then the movable gate 3 is opened. The tasks of raising the capture mechanism 6 and opening the movable gate 3 are performed manually, for example, by an operator. The timing for opening the movable gate 3 is when the water level 13 on the front surface 22 side of the waterstop wall 2 exceeds a predetermined threshold and it is predicted that the water level will then exceed the waterstop wall 2. The water level 13 may be checked visually, or may be measured by installing a sensor or surveillance camera (not shown) on the top edge of the waterstop wall 2.

[0024] When a plurality of capture structures 1 are provided on the water blocking wall 2, the movable gates 3 of all the capture structures 1 may be opened simultaneously or at different times. Also, the movable gates 3 of some of the capture structures 1 may be opened while the movable gates 3 of the remaining capture structures 1 are kept closed.

[0025] In the capture structure 1, when the movable gate 3 is opened, an opening 14 is formed, and a fast flow occurs from the front 22 side of the waterstop wall 2 to the opening 14, and water containing drifting objects 12 flows into the back 21 side of the waterstop wall 2. As shown in FIG. 3, when water containing drifting objects 12 flows in from the opening 14, the capture mechanism 6 captures drifting objects 12 of a predetermined size or more while allowing the water to pass through. As described above, the capture mechanism 6 is formed in two stages with a wire 6-1 and a wire mesh 6-2, and the distance between the wires 6-1 is larger than the mesh of the wire mesh 6-2. Therefore, as shown in FIG. 3(a), the wire 6-1 captures drifting objects 12 such as driftwood that are too small to pass between the wires 6-1. In addition, the wire mesh 6-2 captures drifting objects 12 such as plastic containers that are too small to pass through the mesh of the wire mesh 6-2 among the drifting objects 12 that have passed between the wires 6-1.

[0026] The cut-off wall 2 surrounding the structure 5 is generally installed as a measure against inland flooding in urban areas, where rainwater that cannot be treated due to the drainage function being unable to keep up with a large amount of rain overflows. When the capture structure 1 installed in the cut-off wall 2 is operated, sensors may be installed in manholes near the structure 5, and the water level conditions around the structure 5 may be simulated based on the positions and water levels of multiple manholes. This allows the conditions around the structure 5 to be grasped in advance, and the movable gate 3 and driftwood capture unit 4 to be operated appropriately.

[0027] In this way, in the capture structure 1 of the first embodiment, the drifting object capture section 4 is provided on the back surface 21 side of the waterstop wall 2 so as to surround the movable gate 3, and when the movable gate 3 provided on the upper part of the waterstop wall 2 is opened, the opening 14 is formed at a position lower than the height 17 of the part 2a of the waterstop wall 2 other than the movable gate 3. In this way, when water is made to flow inward from a part of the waterstop wall 2, the water flow becomes faster near the surface of the surrounding water, and the drifting objects 12 floating around are carried by the flow and collected to the opening 14. Therefore, before the water level 13 on the front surface 22 side of the waterstop wall 2 exceeds the height 17, water can be made to flow in from the opening 14 to collect and capture the drifting objects 12 floating in the surrounding water to the drifting object capture section 4. Therefore, even if the water level exceeds the waterstop wall 2, the drifting objects floating around can be first flowed into the drifting object capture section and captured, thereby preventing the scattering of the drifting objects 12 in the site surrounded by the waterstop wall 2 after a flood.

[0028] In the capture structure 1, the capture mechanism 6 is raised in conjunction with the opening of the movable gate 3. Therefore, the capture mechanism 6 can be managed in a state where it does not interfere with traffic within the premises during normal times, and can be raised and used during flooding.

[0029] In the capture structure 1, the capture mechanism 6 is formed in two stages, and the size of the driftwood 12 to be captured decreases from the side closest to the water blocking wall 2. Therefore, driftwood 12 of various sizes can be separated and captured. In addition, by capturing large driftwood 12 with the wire 6-1, the collision energy of the driftwood 12 can be absorbed.

[0030] In the first embodiment, the movable gate 3 is opened manually, but it may be opened and closed automatically. In this case, for example, a float switch is provided on the front surface 22 side of the waterstop wall 2, and the movable gate 3 is controlled to open when the water level 13 is higher than the lower end 18 of the movable gate 3 and lower than the height 17 of the waterstop wall 2. Alternatively, a control unit 19 (FIG. 1) may be provided in the structure 5, and a water level sensor and a pressure sensor (not shown) may be provided on the top end of the waterstop wall 2 to measure the water level 13 on the front surface 22 side of the waterstop wall 2, and the control unit 19 may control the movable gate 3 to open when the water level 13 is higher than the lower end 18 of the movable gate 3 and lower than the height 17 of the waterstop wall 2.

[0031] Even when the movable gate 3 is opened automatically, the capture mechanism 6 is raised to the state shown in Fig. 3(a) before the movable gate 3 opens. For example, the capture mechanism 6 is automatically raised by a float switch or the control unit 19 in conjunction with the opening of the movable gate 3.

[0032] Hereinafter, other examples of the present invention will be described as the second and third embodiments. In the second and third embodiments, differences from the first embodiment will be described, and the same configurations will be denoted by the same reference numerals in the drawings and the like, and the description thereof will be omitted. In addition, the configurations described in the first to third embodiments can be combined as necessary.

[0033] [Second embodiment] Figure 4 shows a capture structure 1a according to a second embodiment of the present invention, and Figure 5 shows the capture structure 1a with the movable gate 3a open. The capture structure 1 a of the second embodiment differs from the capture structure 1 of the first embodiment mainly in that the driftwood capture section 4 a is detachable from the water blocking wall 2 .

[0034] As shown in Figures 4 and 5, the driftwood capturing section 4a of the capturing structure 1a is composed of a capturing mechanism 6a, a frame 7a-1, a cart 7a-2, etc. The capturing mechanism 6a is composed of a wire 6-1 and a wire mesh 6-2. The wire 6-1 and the wire mesh 6-2 are attached to a frame 7a-1 fixed on the cart 7a-2. The wire 6-1 is provided so as to divide the area surrounded by the wire mesh 6-2 into three parts: a part close to the water blocking wall 2, a middle part, and a part far from the water blocking wall 2. In other words, the capturing mechanism 6a can be traveled by the cart 7a-2, and is formed into three stages by the wire 6-1 and the wire mesh 6-2.

[0035] In the capture structure 1a, during normal times, the drifting object capture unit 4a shown in FIG. 4(b) is stored at any location that does not interfere with traffic. During flooding, before the movable gate 3a is opened, the drifting object capture unit 4a is fixed to the back surface 21 of the waterstop wall 2 as shown in FIG. 5. For example, the drifting object capture unit 4a is connected to a fixing part provided on the back surface 21 of the waterstop wall 2. The drifting object capture unit 4a may be connected to the waterstop wall 2 via a frame 7a-1 or a cart 7a-2, or the cart 7a-2 may be fixed to the ground surface 10 by a stopper 7a-3 or an outrigger (not shown). The drifting object capture unit 4a is installed so as to surround the movable gate 3a in a plan view.

[0036] Once the drifting object capture unit 4a is fixed to the back surface 21 side of the water blocking wall 2, when the water level 13 on the front surface 22 side of the water blocking wall 2 exceeds a threshold value, for example, an operator manually slides down the movable gate 3a to open it. Alternatively, the movable gate 3a is automatically lowered and opened by a float switch or a control unit.

[0037] In the capture structure 1a, when the movable gate 3a is opened, an opening 14 is formed at a position lower than the height of the portion 2a of the waterstop wall 2 other than the movable gate 3a, and water flows into the inside of the waterstop wall 2 from the opening 14. When water containing driftwood 12 flows in from the opening 14 as shown in Fig. 5, the capture mechanism 6a captures driftwood 12 of a predetermined size or larger while allowing the water to pass through. As described above, the capture mechanism 6a is formed in three stages by the wire 6-1 and the wire mesh 6-2, and the size of the driftwood 12 captured becomes gradually smaller in the order of the wire 6-1 closer to the waterstop wall 2, the wire 6-1 farther from the waterstop wall 2, and the wire mesh 6-2.

[0038] In the capture structure 1a of the second embodiment, as in the first embodiment, water can be made to flow in from the opening 14 and the driftwood 12 contained in the water can be captured by the driftwood capture section 4a before the water level 13 on the front side 22 of the waterstop wall 2 exceeds the height 17. In addition, scattering of the driftwood 12 within the site surrounded by the waterstop wall 2 after a flood can be prevented.

[0039] In the capture structure 1a, a movable driftwood capture unit 4a that can run is used, so that the driftwood capture unit 4a can be stored at any location during normal times, and can be installed and used on the back surface 21 side of the water cut-off wall 2 during floods. The movable gate 3a may be slid upwards as long as it does not hinder the inflow of driftwood 12. Also, in this embodiment, the opening and closing of the movable gate 3a may be automatically controlled.

[0040] [Third embodiment] FIG. 6 is a diagram showing a river 15 in which a capture structure 1b according to the third embodiment of the present invention is installed. The capture structure 1b of the third embodiment differs from the capture structure 1 of the first embodiment mainly in that a movable gate 3 is provided at a closed portion 2b of a barrier 16.

[0041] As shown in Figure 6, a levee 16 is formed in a river 15 to weaken the force of the flow by causing water to flow backward when the river 15 floods. A closed section 2b is provided at the end of the levee 16 opposite the part where it branches off from the river 15, and the land on the rear side 21 of the closed section 2b is used as fields, etc. The closed section 2b is a waterproof structure that prevents water that flows backward from the river 15 into the levee 16 from flowing into the fields, etc. on the rear side 21.

[0042] In the capture structure 1b, a movable gate 3 is provided on the upper part of the closed-off part 2b. In addition, a driftwood capture part 4 is provided on the back surface 21 side of the closed-off part 2b so as to surround the movable gate 3. In the capture structure 1b, when the movable gate 3 provided on the upper part of the closed-off part 2b is opened, an opening is formed at a position lower than the height of the part 2c of the closed-off part 2b other than the movable gate 3.

[0043] When operating the capture structure 1b installed in the closed section 2b of the levee 16, cameras or the like capable of monitoring the water level of the river 15 may be installed in multiple locations to predict the water level inside the levee 16. This allows the state of the levee 16 to be grasped in advance, and the movable gate 3 and driftwood capture section 4 to be operated appropriately.

[0044] In the capture structure 1b of the third embodiment, water is allowed to flow in from the opening, and driftwood contained in the water can be separated and captured by the driftwood capture section 4 before the water level on the front 22 side of the closing section 2b reaches the height of the portion 2c of the closing section 2b other than the movable gate 3. Furthermore, after a flood, driftwood is not scattered in the fields, etc. on the back 21 side of the closing section 2b. Note that, although a supplementary structure is provided in the closing section 2b of the levee 16 in this embodiment, the same can also be applied to closing sections of similar structure, such as ring levees and double levees.

[0045] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the technical ideas disclosed in this application, and it is understood that such examples also naturally belong to the technical scope of the present invention.

[0046] For example, the configuration of the drifting object capturing unit 4, 4a is not limited to the above. The drifting object capturing unit may be any one that can capture drifting objects without being damaged by water pressure or collision energy of drifting objects, and the capturing mechanism 6, 6a may be a plastic net or a filter with slits. The capturing mechanism may be erected by standing up a pole to which the capturing mechanism is attached from a lying position, or the capturing mechanism 6 may be raised as the water level rises by the buoyancy of a float to which the capturing mechanism is attached. [Explanation of symbols]

[0047] 1, 1a, 1b……capture structure 2. Water cutoff wall 2a, 2c……parts 2b: Closure 3, 3a... Movable gate 4, 4a……Flotsam trapping section 5……Structure 6, 6a……Capturing mechanism 6-1…Wire 6-2………Wire mesh 7-1………Pillar 7-2………Float 7a-1………Frame 7a-2: Cart 7a-3………Stopper 8.... Hinge 9...Bracket 10……ground surface 11...Scouring prevention structure 12……Flotsam 13……Water level 14...Opening 15. River 16……Kasumi Bank 17………Height 18……Lower end 19...Control section 21……Back side 22...Front

Claims

1. A structure for capturing driftwood in a waterproof structure provided at a predetermined height, A movable gate provided on the upper portion of the waterproof structure and capable of being opened and closed; a drifting object capture section provided on the rear side of the waterproof structure so as to surround the movable gate in a plan view, the drifting object capture section having a capture mechanism that allows water to pass through but captures drifting objects of a predetermined size or larger; Equipped with A driftwood capture structure characterized in that, when the movable gate is opened, an opening is formed at a position lower than the height of parts of the waterproof structure other than the movable gate, allowing water to flow into the driftwood capture section.

2. A control unit for opening and closing the movable gate is provided, The driftwood capture structure described in claim 1, characterized in that the control unit opens the movable gate when the water level on the front side of the waterproof structure is higher than the lower end of the movable gate and lower than the height of parts of the waterproof structure other than the movable gate.

3. 2. The driftwood capturing structure according to claim 1, characterized in that, in the driftwood capturing section, the capturing mechanism can be raised or erected in conjunction with the opening of the movable gate.

4. 2. The structure for capturing driftwood according to claim 1, wherein the capturing mechanism is detachable from the waterproof structure.

5. 2. The driftwood capturing structure according to claim 1, wherein the capturing mechanism is formed in a plurality of stages, and the size of the driftwood to be captured gradually decreases from the waterproof structure side.

6. 2. The driftwood capture structure according to claim 1, wherein the waterproof structure is a water blocking wall formed to surround the structure.

7. 2. The driftwood capture structure according to claim 1, wherein the waterproof structure is a closed section of a levee, a ring levee, or a double levee.

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