Method for estimating drift material accumulation volume, drift material capture body, and information management system

Abstract

To provide an economical and safe flowing-down object amount estimation method and a flowing-down object capturing body.SOLUTION: A flowing-down object capturing body 10 for capturing flowing-down objects at an erosion control dam comprises: flexible capturing members 11a and 11b arranged to cross an effluent direction in a flow passage of the effluent; a support member 15 capable of detachably fixing the capturing members 11a and 11b in the flow passage; a displacement measuring device 20 for performing a displacement measuring step of acquiring displacement information by measuring the variation of a position of the capturing members 11a; and a notification device 29. When the capturing member 11a captures a flowing-down object 6, the capturing member 11a extends by the weight of the flowing-down object 6, and the displacement measuring device 20 acquires an extended amount of the capturing member 11a as displacement information. The displacement information is notified to an outside information management system via the notification device 29. The information management system performs a deposit amount estimating step of the flowing-down object at the flowing-down capturing body 10 related to the flowing-down object 6 on the basis of the notified displacement information.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] This invention relates to a method for estimating the amount of sediment deposited on the river. and Fallen object trap and information management system The present invention relates in particular to a drift material capture body that captures drift material in an erosion control dam and a method for estimating the amount of drift material accumulated in such a drift material capture body. [Background technology]

[0002] Sabo dams are known as structures used to prevent landslides in mountain streams, etc. Sabo dams allow water to pass through while capturing downstream debris such as sediment, gravel and driftwood carried along by debris flows and floods, thereby protecting conservation targets downstream.

[0003] However, in recent years, large amounts of runoff caused by typhoons and floods have become too large for sabo dams alone to capture, and there have been cases where the runoff has flowed down or overtopped the sabo dams and reached conservation targets downstream.

[0004] To deal with such cases, there has conventionally been a fluid capture structure capable of capturing fluids such as driftwood that has not been captured by a sabo dam and has flowed overboard (Patent Document 1).

[0005] Figure 15 is a schematic plan view showing a conventional fluid capture structure, Figure 16 is an arrow view of line XVI-XVI shown in Figure 15, and Figure 17 is an arrow view of line XVII-XVII shown in Figure 15, showing the fluid capture body of the fluid capture structure from a direction perpendicular to the flowing water direction.

[0006] 1 and 2, the fluid capturing structure 71 is made up of fluid capturing bodies 72a to 72c, which are arranged in three rows in a direction perpendicular to the direction of flowing water and have a generally U-shape when viewed from above.

[0007] As shown in FIG. 17, for example, the fluid object capture body 72c is composed of a capture member 75c and a support member 76. The capture member 75c includes a pair of capture members 77a, 77b that are parallel to the flow direction and inclined downward from the downstream side to the upstream side, and first horizontal bars 78a to 78c that are attached to cross the capture members 77a, 77b. The first horizontal bar 78a includes a steel chain 68 as an axis and an elastic body 69 that embeds the steel chain 68 in a partially loosened state, and the elastic body 69 absorbs the impact of the fluid object and captures the fluid object while cushioning it. Each of the first horizontal bars 78b and 78c has a similar configuration to the first horizontal bar 78a.

[0008] With this configuration, the flowing water passes through the fluid capture body 72c, while the fluid is captured by the capture materials 77a, 77b and the first horizontal bars 78a-78c, thereby improving the efficiency of capturing the fluid while preventing the flow of water from being blocked.

[0009] In addition, the above-mentioned fluid capture structure 71 loses its capture ability when the captured fluid, such as driftwood, exceeds the capture limit capacity, but the generation of fluid or the accumulation state of fluid cannot be detected by the fluid capture structure 71. Therefore, in order to check the presence or absence of fluid and to consider the need for tree removal, it was necessary to visually inspect the site where the fluid capture structure 71 was installed.

[0010] However, visual inspection of the fluid capture structures 71, which are mainly installed in mountainous regions, is dangerous, especially immediately after a disaster. In addition, the fluid capture structures 71 are scattered throughout mountainous regions, but the number of personnel who can be dispatched to the sites for visual inspection is limited, so the number of fluid capture structures 71 that can be inspected in a day is limited, resulting in problems of inefficiency and high cost.

[0011] Conventionally, there exist debris flow detection systems (Patent Document 2) and detection devices (Patent Document 3) for detecting debris flows.

[0012] Figure 18 is a plan view of a steel transparent-type sand-control dam using a conventional debris flow detection system, Figure 19 is a side view of the XIX-XIX line shown in Figure 18, Figure 20 is an enlarged view of the "Z" portion shown in Figure 19, Figure 21 is an arrow view (seen from the downstream side) of the XXI-XXI line shown in Figure 20, Figure 22 is a diagram showing a conventional detection device, Figure 23 is a diagram showing an example of a tubular switch used in the detection device shown in Figure 22, and Figure 24 is a diagram showing an example of the installation of the detection device shown in Figure 22.

[0013] 18 to 21, 80 is a dam, 81 is a waterway of a specific width provided at a predetermined location of the dam 80, 82 is a flanged pipe for forming a steel vertical member, 83 is a flanged pipe for forming a steel horizontal member, 84a and 84b are lattice walls formed by combining a plurality of steel vertical members formed by connecting the flanged pipes 82 and a plurality of steel horizontal members formed by connecting the flanged pipes 83 so that they intersect, 85 is a flanged pipe for forming a steel connecting member for connecting the lattice walls 84a and 84b in the flow direction of the waterway 81 and assembling them into a tower shape, 86 is an accelerometer for detecting an impact (for example, a debris flow, etc.) applied to the steel permeable-type sabo dam body, 87 is hard putty as a protective member for protecting the accelerometer 86 from debris flows and the external environment, and 88 is a cable for transmitting an acceleration signal detected by the accelerometer 86 to an external signal processing unit.

[0014] Conventional debris flow detection systems use the above configuration to detect an impact applied to the sabo dam body as an acceleration signal using an accelerometer 86, and if the detected acceleration signal is subjected to specified processing in the signal processing unit and it is determined that the impact is due to a debris flow, a debris flow signal is transmitted.

[0015] Next, referring to Fig. 22 to Fig. 24, the detection device 90 comprises one tubular switch 91, two wire ropes 92a, 92b arranged in parallel on both sides of the tubular switch 91, and two lashing rods 93a, 93b spirally wound around the tubular switch 91 and the wire ropes 92a, 92b. The tubular switch 91 comprises a pair of conductive members 95 fixed to the inner surface of a flexible tube member 94 so that a part of the conductive members 95 is exposed to the internal space, and a detection circuit (not shown) connected to the conductive members 95. When the tube member 94 is crushed or deformed by an external force, the pair of conductive members 95 come into contact with each other, forming a closed circuit connecting the detection circuit and the pair of conductive members 95, and this makes it possible to detect that the tube member 94 has been subjected to an external force, for example, that it has been crushed by a falling rock or the like.

[0016] The detector 90 is installed, for example, by fixing wire ropes 92a, 92b to poles 97, 98 erected on the slope of a mountain. In this state, when soil or rocks hit the lashing rod 93a, the tubular switch 91 is crushed, the internal conductive member 95 becomes conductive, and the detection circuit detects the occurrence of a rockfall and the location of the rockfall. When the detection circuit detects a rockfall, the signal is transmitted to the alarm device, which issues an alarm using a siren, voice, etc. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] JP 2019-090307 A [Patent Document 2] JP 2011-021446 A [Patent Document 3] JP 2003-149013 A Summary of the Invention [Problem to be solved by the invention]

[0018] However, the above-mentioned conventional debris flow detection system and detection device 90 only detect the occurrence and passing of debris flows, etc., and do not detect the presence or absence of accumulation of fluid material and the amount of accumulation. Therefore, even if these are combined with the fluid material capture structure 71, visual inspection is still required to confirm the presence or absence of accumulation of fluid material and to consider the need for tree removal.

[0019] The present invention has been made to solve the above problems, and provides an economical and safe method for estimating the amount of accumulated runoff. and Fallen object trap and information management system The purpose is to provide. [Means for solving the problem]

[0020] In order to achieve the above object, the present invention provides a method for estimating the amount of accumulated drift material in a drift material capture body that captures drift material in a sabo dam, the method comprising: a displacement measuring step for measuring a change in position of a flexible capture member that is incorporated in the drift material capture body, is permeable to flowing water, and is capable of capturing drift material, to obtain displacement information; Based on the information of the capture member that has been preset, a tensile load applied to the capture member and a deflection amount of the capture member are calculated, and based on the calculated tensile load and deflection amount, an upper load applied to the capture member is calculated, and based on the calculated upper load and the specific gravity information of the flowing-down material, and an accumulation amount estimation step for estimating the accumulation amount of the flow-down material.

[0021] In this way, the capture member can be used to estimate the amount of deposition.

[0022] The invention described in claim 2 is a drift material capture body that captures drift material in a sabo dam. and information management system And, The drift catcher is The present invention relates to a flexible trapping member that is disposed in a flow path of flowing water so as to cross the flow direction of the flowing water, is permeable to the flowing water, and is capable of trapping objects that flow down the flow path; a support member that can detachably fix the trapping member in the flow path; a displacement measuring device that measures a change in the position of the trapping member to obtain displacement information; and a device that obtains the displacement information and outputs it to an external device. Information Management System and a notification device for notifying the The information management system calculates the tensile load acting on the capture member and the amount of deflection of the capture member based on the displacement information and the preset information on the capture member, calculates the upper load acting on the capture member based on the calculated tensile load and the amount of deflection, and estimates the amount of accumulated flow-down material in the flow-down material capture body based on the calculated upper load and the preset specific gravity information of the flow-down material. It is something.

[0023] With this configuration, the information required to estimate the amount of deposition can be obtained without going to the site.

[0024] The invention described in claim 3 is the same as the invention described in claim 2, in which the capturing member includes a steel chain and an elastic body in which the steel chain is embedded in a slackened state.

[0025] With this structure, the elastic body stretches particularly easily when the floating object is captured. Also, the force applied to the capturing member due to the collision of the floating object is absorbed by the stretching of the steel chains and the compression of the elastic body between the steel chains.

[0026] The invention as recited in claim 4 is characterized in that in the configuration of the invention as recited in either claim 2 or claim 3, the displacement information is an amount of extension of the capturing member.

[0027] With this configuration, the state of the capture member can be grasped more specifically.

[0028] The invention described in claim 5, in the configuration of the invention described in claim 4, comprises a device main body fixed to a support member, and a thread-like member having a single thread-like shape, one end of which is connected to the device main body and can expand and contract based on the device main body, and the other end of which is connected to a capturing member, the device main body comprising a displacement information acquisition means for measuring the amount of expansion of the thread-like member to obtain displacement information, and the alarm device is incorporated into the device main body.

[0029] With this configuration, the amount of elongation of the capture member can be grasped using a simple structure.

[0030] The invention as recited in claim 6 is the same as the invention as recited in claim 5, in which the notification device notifies the displacement information wirelessly.

[0031] With this configuration, no wiring work is required during installation. Effect of the Invention

[0032] As described above, the invention described in claim 1 allows the capture member to be used to estimate the amount of accumulated material, making it an economical and safe method for estimating the amount of accumulated material.

[0033] The invention described in claim 2 makes it possible to obtain the information necessary to estimate the amount of deposition without going to the site, thereby reducing the number of visual inspections at the site, which is both economical and safe.

[0034] In the invention of claim 3, in addition to the effect of the invention of claim 2, the elastic body part is particularly easy to stretch when capturing the flowing object. Also, the force applied to the capturing member due to the collision of the flowing object is absorbed by the stretching of the steel chains and the compression of the elastic body between the steel chains, resulting in a capturing member with high capturing performance, cushioning performance and durability.

[0035] The invention described in claim 4 has the effect of the invention described in either claim 2 or claim 3, and in addition, allows the state of the capturing member to be grasped more specifically, so that confirmation of the situation and a determination as to whether or not maintenance inspection is required can be made more accurately.

[0036] The invention described in claim 5, in addition to the effects of the invention described in claim 4, makes it possible to grasp the amount of elongation of the capture member using a simple structure, thereby reducing the costs incurred in the displacement measuring device and the notification device and increasing the accuracy of the displacement information.

[0037] The invention recited in claim 6 has the same effect as the invention recited in claim 5, and in addition, eliminates the need for wiring work during installation, thereby shortening construction time and reducing installation costs. [Brief description of the drawings]

[0038] [Figure 1] 1A and 1B are a side view and a front view of a flow-down object capture body according to a first embodiment of the present invention, the flow-down object capture body being installed in a flow path. [Diagram 2] 2 is an enlarged view of the “V” portion shown in FIG. 1 and a schematic diagram of a displacement measuring device. [Diagram 3] 3 is a block diagram of the displacement measuring device shown in FIG. 2 and an overall configuration diagram of an estimation system including the displacement measuring device. [Figure 4] 2 is a side view and a partially enlarged side view of the drifting object capturing body shown in FIG. 1 in a state in which the drifting object is captured. [Diagram 5]2(a) and 2(b) are a partially enlarged side view and a partially enlarged front view of a flow-down object capture body according to a second embodiment of the present invention, respectively, and correspond to FIG. 2(a) of the first embodiment. [Figure 6] FIG. 11 is a front view of a flow-down object capture body according to a third embodiment of the present invention, installed in a flow path. [Figure 7] FIG. 7 is an enlarged view of the “X” portion shown in FIG. [Figure 8] FIG. 8 is a plan view of the flow-down object capture body shown in FIG. [Figure 9] 8 is a cross-sectional view taken along line IX-IX shown in FIG. 7. [Figure 10] 7 is a front view of the drifting object capturing body shown in FIG. 6 in a state in which the drifting object has been captured. [Figure 11] FIG. 11 is an enlarged view of the “Y” portion shown in FIG. [Figure 12] FIG. 11 is a partially enlarged front view of a flow-down object capture body according to a fourth embodiment of the present invention, installed in a flow path, and corresponds to FIG. 7 of the third embodiment. [Figure 13] FIG. 13 is a plan view of the drift object capture body shown in FIG. [Figure 14] 13 is a cross-sectional view of line XIV-XIV shown in FIG. 12. [Figure 15] FIG. 1 is a schematic plan view showing a conventional fluid object capture structure. [Figure 16] 16 is a view taken along the arrows of line XVI-XVI shown in FIG. 15. [Figure 17] 16 is a view taken along line XVII-XVII in FIG. 15, in which the fluid capturing body of the fluid capturing structure is viewed from a direction perpendicular to the flowing water direction. [Figure 18] FIG. 1 is a plan view of a steel see-through sabo dam using a conventional debris flow detection system. [Figure 19] FIG. 19 is a side view of line XIX-XIX shown in FIG. 18. [Figure 20] FIG. 20 is an enlarged view of the “Z” portion shown in FIG. [Figure 21] This is a cross-sectional view (seen from the downstream side) of line XXI-XXI shown in Figure 20. [Figure 22]FIG. 1 illustrates a conventional detection device. [Diagram 23] FIG. 23 is a diagram showing an example of a tubular switch employed in the detection device shown in FIG. 22. [Figure 24] FIG. 23 is a diagram showing an example of installation of the detection device shown in FIG. 22. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] FIG. 1 is a side view and a front view of a flow-down object capture body according to a first embodiment of the present invention installed in a flow path, FIG. 2 is an enlarged view of the "V" portion shown in FIG. 1 and a schematic diagram of a displacement measuring device, and FIG. 3 is a block diagram of the displacement measuring device shown in FIG. 2 and an overall configuration diagram of an estimation system including the displacement measuring device.

[0040] First, referring to Figures 1(1) and (2), in order to capture drifting material (described later) at the erosion control dam 1, a drifting material capture body 10 is installed in the flow path 2 (water beating section) of the erosion control dam 1. In Figure 1(1), the left side is the downstream side and the right side is the upstream side, and in Figure 1(2), the front side of the page is the downstream side and the back side of the page is the upstream side.

[0041] The flow-down object capture body 10 includes capture members 11a and 11b, a support member 15, and a displacement measuring device 20.

[0042] The support member 15 is mainly composed of a steel platform assembled by connecting H-shaped steel with bolts or the like, and includes columnar parts 151a and 151b, fixed parts 152a and 152b, inclined parts 153a and 153b, and a connecting part 154. The support member 15 fixes the capture members 11a and 11b arranged between the inclined parts 153a and 153b so as to cross the flow direction in the flow path 2 of the flowing water. The capture member 11b is provided in the middle of the flow direction, and the capture member 11a is provided above the capture member 11b, that is, near the upper end of the incline. The support member 15 is detachably fixed to the bottom surface of the flow path 2 by using anchor bolts 16 at the fixed parts 152a and 152b. That is, the support member 15 is configured to be able to detachably fix the capture members 11a and 11b in the flow path 2.

[0043] The capture member 11b comprises a steel chain 12 as a core material, and an elastic body 13 in which the steel chain 12 is embedded in the vicinity of each end of the steel chain 12 in a partially loosened state. The capture member 11b as a whole is flexible, permeable to flowing water, and capable of capturing objects flowing downstream.

[0044] With this construction, the elastic body 13 is particularly likely to stretch when capturing floating objects, as described below. Furthermore, the force applied to the capturing member 11b due to the collision of the floating objects is absorbed by the stretching of the steel chains 12 and the elastic body 13 on the outside of the steel chains 12, and the compression of the elastic body 13 between the steel chains 12, resulting in the capturing member 11b having high capturing performance, cushioning performance, and durability. The capturing member 11a has a similar construction to the capturing member 11b.

[0045] Next, referring to (1) and (2) in Figure 2, the displacement measuring device 20 uses a measuring device described in JP 2020-71194 A, which is mainly used for crack management.

[0046] The displacement measuring device 20 comprises a device body 21 fixed to the support member 15 via an attachment member 17, and a filamentous member 22 made of a single steel wire. Specifically, the device body 21 is attached below the web portion 155 of the connection portion 154 of the support member 15. One end portion 23 of the filamentous member 22 is connected to the device body 21, and the other end portion 24 is connected to the capturing member 11a, and the filamentous member 22 is stretched without slack between the device body 21 and the capturing member 11a.

[0047] The device body 21 is provided with a pulley 25. In addition, the pulley 25 is connected to a bracket 27 fixed to the mounting member 17 and a shaft 26 connecting the pulley 25 and the device body 21. The device body 21 is fixed to the mounting member 17 via the bracket 27 in a state in which it is rotatable about the shaft 26 from a reference position (the position shown in FIG. 2(1)) and is biased to return to the reference position.

[0048] Furthermore, the thread-like member 22 is attached to the pulley 25 so that it can be wound and pulled out, and the thread-like member 22 can expand and contract based on the device main body 21, and the device main body 21 is configured to rotate as the thread-like member 22 is wound or pulled out.

[0049] The mounting member 17 is provided with a guide roller 18 at a position that becomes the upstream side when mounted, and the thread-like member 22 pulled out from the pulley 25 heads upstream via the guide roller 18 and extends to the capturing member 11a through a through hole 157 provided in a flange portion 156 on the upstream side of the connection part 154. The other end 24 is attached to one of the elements of the steel chain 12 located in the center of the capturing member 11a where the steel chain 12 is exposed.

[0050] The device body 21 is equipped with a displacement information acquiring means 28 that measures the rotational state of the device body 21 from a reference position to obtain rotation information, measures the amount of elongation of the thread-like member 22 based on the rotational information, measures the amount of elongation of the capturing member 11a (described later) based on the amount of elongation of the thread-like member 22, and obtains the amount of elongation of the capturing member 11a as displacement information. As the displacement information acquiring means 28, for example, an acceleration sensor that measures acceleration corresponding to the inclination can be used. Also, the device body 21 incorporates an alarm device 29 that obtains the displacement information and notifies the outside.

[0051] Now, referring to FIG. 3, the displacement measuring device 20 constitutes an estimation system 100 including an information management system 103 configured by cloud computing or the like that is made up of a server, storage, a network, and the like.

[0052] In the estimation system 100, when the displacement information acquisition means 28 acquires displacement information, the notification device 29 notifies the displacement information to a base station 104 serving as a relay station by wireless LPWA (Low Power Wide Area) method. The information management system 103 receives the displacement information via the base station 104, and performs calculations and stores the measurement results as necessary. In addition, in response to a request from the information processing device 102, which is composed of a smartphone, a tablet terminal, a personal computer, or the like, via a network 105 such as the Internet, the information management system 103 provides the stored measurement results to the information processing device 102. The effects of this configuration will be described later.

[0053] FIG. 4 is a side view and a partially enlarged side view of the drift object capturing body shown in FIG. 1 in a state in which the drift object has been captured.

[0054] First, referring to Fig. 4(1), a driftwood (driftwood) 6 is captured by the capture members 11a and 11b of the driftwood capture body 10. For ease of explanation, the driftwood 6 is shown as a single piece of driftwood in the figure, but in reality, countless pieces of driftwood are captured as the driftwood 6. As described above, the capture member 11a is fixed by the support member 15 and is configured to be easily stretched around the elastic body 13 portion shown in Fig. 1(2) (the elastic body 13 between the steel chains 12 is compressed by the load of the driftwood 6), so the capture member 11a stretches due to the weight of the driftwood 6.

[0055] Now, referring to FIG. 4(2), which is an enlarged view of the "W" portion of FIG. 4(1), the thread-like member 22 extends in response to the extension of the capturing member 11a, so as to be pulled out based on the device body 21, and as the thread-like member 22 extends, the device body 21 rotates from the reference position shown by the two-dot chain line in the figure to the position shown by the solid line in the figure.

[0056] Then, based on the rotation information of device body 21 of displacement measuring device 20, displacement information acquiring means 28 sequentially measures the amount of elongation of thread-like member 22 and the amount of elongation of capturing member 11a by conversion, and obtains displacement information (displacement measuring step).

[0057] Here, referring again to FIG. 3, the obtained displacement information is wirelessly notified to the base station 104 via the notification device 29, and then transmitted from the base station 104 to the information management system 103.

[0058] In the information management system 103, when the notified displacement information reaches a preset value, the tensile load applied to the capture member 11a and the deflection amount of the capture member 11a are calculated based on the displacement information and the preset information of the capture member 11a (information related to the relationship between the elongation amount and the load). Next, the upper load applied to the capture member 11a is calculated based on the calculated tensile load and the deflection amount. Finally, the deposition amount (deposition load) of the flowing object 6 in the flowing object capture body 10 related to the flowing object 6 is estimated based on the calculated upper load and the preset specific gravity information of the flowing object (deposition amount estimation process). The estimated flowing object deposition amount thus obtained is stored in the information management system 103 as a measurement result, and is also provided to the information processing device 102 via the network 105 in response to a request from the information processing device 102. The information processing device 102 presents the estimated flowing object deposition amount (measurement result) to the user on a screen display. For example, a display method may be a form such as a graph showing the change in the measurement result over time. The estimated amount of sediment thus presented is used as information for determining whether visual inspection or removal work is required.

[0059] In this way, the capture member 11a can be used to estimate the accumulated amount of flow-down matter, which results in an economical and safe method for estimating the accumulated amount of flow-down matter.

[0060] Furthermore, with this configuration, the information required to estimate the amount of accumulated waste can be obtained without going to the site, so the number of visual inspections at the site can be reduced, making it more economical and safer.

[0061] Furthermore, since the state of the capturing member 11a can be grasped more specifically, it is possible to more accurately check the situation and determine whether or not maintenance and inspection are required.

[0062] Furthermore, since the amount of elongation of the capturing member 11a can be grasped using a simple structure, the costs for the displacement measuring device 20 and the notification device 29 are reduced and the accuracy of the displacement information is increased.

[0063] Furthermore, since no wiring work is required for installation, construction time can be shortened and installation costs can be reduced.

[0064] FIG. 5 is a partially enlarged side view of a flow-down object capturing body according to a second embodiment of the present invention, which corresponds to FIG. 2(1) of the first embodiment, and a partially enlarged front view.

[0065] Incidentally, the configuration of the flow-down object capture body 30 according to the second embodiment is basically the same as that of the flow-down object capture body 10 according to the above-mentioned first embodiment, so the following description will focus on the differences.

[0066] 1, the flow-down object capture body 30 is configured by retrofitting a displacement measuring device 20 to a support member 15 and a capture member 11a that have already been installed in the flow path 2. As shown in FIG.

[0067] With the displacement measuring device 20 attached to the mounting member 17, a frame 34 consisting of a plate-like installation member 31, which is U-shaped in side view and on which the mounting member 17 is installed, four L-shaped steels 32a to 32d, and four connecting bolts 33a to 33d is attached so as to sandwich the connection part 154 of the support member 15, thereby being retrofitted to the support member 15. With this configuration, a function for estimating the amount of accumulated flowing material can be easily added to existing equipment.

[0068] Figure 6 is a front view of a flow-down object capture body according to the third embodiment of the present invention installed in a flow path, Figure 7 is an enlarged view of the "X" portion shown in Figure 6, Figure 8 is a plan view of the flow-down object capture body shown in Figure 7, and Figure 9 is a cross-sectional view of line IX-IX shown in Figure 7.

[0069] First, referring to Fig. 6, in order to capture drifting debris at the erosion-control dam 1, a drifting debris capture body 40 is installed in the flow path 4 (water passage section) of the main dam 3 of the erosion-control dam 1. In Fig. 6, the front side of the page is the downstream side, and the back side of the page is the upstream side.

[0070] The flow-down object capture body 40 includes capture members 41a and 41b, support members 45a to 45d, and a displacement measuring device 20. The displacement measuring device 20, the displacement measuring process, and the deposition amount estimating process are the same as those in the first embodiment described above, and therefore will not be described in detail here.

[0071] Next, referring to Fig. 6 to Fig. 9, the capturing member 41a includes a steel chain 42 as a core material, and elastic bodies 43a and 43b that are embedded in the steel chain 42 in a state where the steel chain 42 is partially loosened near each end of the steel chain 42. The capturing member 41a as a whole has flexibility, is permeable to flowing water, and is capable of capturing the flowing object. With this configuration, the elastic bodies 43a and 43b are particularly likely to stretch when capturing the flowing object. Furthermore, the force applied to the capturing member 41a due to the collision of the flowing object is absorbed by the stretching of the steel chain 42 and the elastic bodies 43 outside the steel chain 42, and the compression of the elastic bodies 43 between the steel chains 42, so that the capturing member 41a has high capturing performance, cushioning performance, and durability. The capturing member 41b has a similar configuration. The capturing members 41a and 41b are connected via a connecting chain 44 that is hung around the center of each of the capturing members.

[0072] The support member 45a is equipped with anchor bolts 46a-46d embedded in the main bank 3 and a metal fixing plate 47, and is attached to the inner wall of the main bank 3. The fixing plate 47 detachably fixes an end of the capture member 41a. Each of the support members 45b-45d has a similar configuration, and fixes each of the ends of the capture members 41a and 41b. With this configuration, the capture members 41a and 41b can be detachably fixed in the flow path 4 via the support members 45a-45d.

[0073] A mounting member 48 for mounting the displacement measuring device 20 is also fixed to the fixed plate 47 of the support member 45a. The mounting member 48 has a plate-like shape that is roughly U-shaped when viewed from the side, and is arranged so as to cover the end side of the elastic body 43a. The displacement measuring device 20 is fixed to the support member 45a by being attached to the upper surface 49 of the mounting member 48, and the other end 24 of the thread-like member 22 is connected to the shackle part 142 of the steel chain 42 that straddles the elastic body 43a, and the thread-like member 22 is stretched without slack between the device main body 21 and the capture member 41a, straddling the elastic body 43a. The effect of this configuration will be described later.

[0074] FIG. 10 is a front view of the drift object capturing body shown in FIG. 6 in a state in which the drift object has been captured, and FIG. 11 is an enlarged view of the "Y" portion shown in FIG.

[0075] First, referring to Fig. 10, a driftwood (driftwood) 6 is captured by the capturing members 41a and 41b of the driftwood capturing body 40. For ease of explanation, the driftwood 6 is illustrated as one piece of driftwood in the figure, but in reality, countless pieces of driftwood are captured as the driftwood 6. As described above, the capturing member 41a is fixed by the support members 45a and 45b, and is configured to be easily stretched around the elastic bodies 43a and 43b (the elastic bodies 43a and 43b between the steel chains 42 are compressed by the load of the driftwood 6), so the capturing member 41a stretches due to the weight of the driftwood 6.

[0076] 11, the thread-like member 22 extends so as to be pulled out from the device body 21 in accordance with the extension of the capture member 41a (elastic body 43a), and the device body 21 rotates from a reference position shown by a two-dot chain line in the figure to a position shown by a solid line in the figure in accordance with the extension of the thread-like member 22. From this rotation information, displacement information that is the amount of extension of the capture member 41a is obtained (displacement measuring step), and the accumulation amount of the flowing-down material in the flowing-down material capture body 40 related to the flowing-down material 6 is estimated based on the displacement information (accumulation amount estimating step).

[0077] In this way, the capture member 41a can be used to estimate the accumulated amount of flow-down matter, which results in an economical and safe method for estimating the accumulated amount of flow-down matter.

[0078] Figure 12 is a partially enlarged front view of a flow-down object capture body according to a fourth embodiment of the present invention installed in a flow path, and corresponds to Figure 7 of the third embodiment, Figure 13 is a plan view of the flow-down object capture body shown in Figure 12, and Figure 14 is a cross-sectional view of line XIV-XIV shown in Figure 12.

[0079] Incidentally, the configuration of the flow-down object capture body 50 according to the fourth embodiment is basically similar to that of the flow-down object capture body 40 according to the above-mentioned third embodiment, so the following description will focus on the differences.

[0080] 1 and 2, the flow-down object capture body 50 is configured by retrofitting the displacement measuring device 20 to the capture member 41a and the support member 45a that are already installed in the flow path 4. As shown in FIG.

[0081] The mounting member 58 on which the displacement measuring device 20 is attached has a plate-like shape that is generally L-shaped when viewed from the front, is disposed so as to cover the upper end side of the capturing member 41a, and is fixed to anchor bolts 46a and 46b of the support member 45a. The displacement measuring device 20 is fixed to the support member 45a by being attached to an upper surface 59 of the mounting member 58. With this configuration, it is possible to easily add a function for estimating the amount of accumulated flowing matter to existing equipment while maintaining the fixed state of the capturing member 41a by the fixing plate 47.

[0082] In addition, in each of the above embodiments, a displacement measurement process was performed in which the amount of elongation of the capturing member was used as displacement information, but a displacement measurement process may also be performed in which the result of measuring the change in the position of the capturing member is used as displacement information and this is measured.

[0083] In addition, in each of the above embodiments, the capturing member has a specific structure made of a steel chain and an elastic body, but it may have other configurations and structures as long as it is flexible overall. For example, it may be made of only a steel chain, only an elastic body, a woven wire rope, etc. The capturing member may include a rigid member in part, and may include at least a stretchable portion in part.

[0084] Furthermore, in each of the above embodiments, the capture member has a specific shape, but as long as it is disposed so as to cross the direction of the flowing water, is permeable to the flowing water, and can capture the flowing matter, it may have another shape, such as a net, a lattice, a screen, etc.

[0085] Furthermore, in each of the above embodiments, the support member has a specific shape and a specific structure, but it may have other shapes and structures as long as it can fix the capture member in a detachable manner in the flow path.

[0086] Furthermore, in each of the above embodiments, the thread-like member is expandable and contractible, but it may be that the thread-like member does not expand and contract but merely rotates the device body.

[0087] Furthermore, in each of the above embodiments, the thread-like member is made of a wire, but it is sufficient that the thread-like member has a single thread-like shape.

[0088] Further, in each of the above embodiments, a specific measuring device is used as the displacement measuring device, but other measuring devices may be used as long as they can measure the amount of elongation of the filamentous member and the capturing member to obtain displacement information. Also, other measuring devices may be used that measure the change in position of other capturing members to obtain displacement information.

[0089] Furthermore, in each of the above-described embodiments, the other end of the thread-like member is attached to a part of the exposed steel chain, but it may be attached midway through the elastic body.

[0090] Furthermore, in the above third and fourth embodiments, the other end of the thread-like member is connected to the shackle portion of the steel chain, but it may be connected to a connecting chain.

[0091] Furthermore, in each of the above embodiments, the device main body was fixed to a specific location on the support member by a specific structure, but as long as it is fixed to the support member, it may be fixed to other structures and other locations on the support member.

[0092] Furthermore, in each of the above embodiments, the device body is fixed to the support member, but it may be fixed to the capture member.

[0093] Furthermore, in each of the above embodiments, the notification device notifies wirelessly, but may notify via wired communication.

[0094] Furthermore, in each of the above embodiments, the notification device notifies an external information management system, but it is sufficient if it notifies the displacement information to the outside. For example, it may be a simple alarm.

[0095] Furthermore, in each of the above embodiments, the notification device is incorporated in the device main body, but it may be installed separately from the displacement measuring device.

[0096] Furthermore, in each of the above-described embodiments, the flow-down object capture body has a specific structure, but it may have a structure other than these.

[0097] Furthermore, in each of the above embodiments, the accumulation amount estimation step is performed by an information management system, but the accumulation amount estimation step may be performed manually based on the displacement information. [Explanation of symbols]

[0098] 1. Erosion control dam 2...Flow path 4...Flow path 10... Fallen object trap 11a, 11b...capturing member 12...Steel chain 13...Elastic body 15...Support member 20...Displacement measuring device 21...Device body 22...Thread-like member 23...One end 24...Other end 28...Displacement information acquisition means 29...Alarm device 30... Fallen object trap 40... Fallen object trap 41a, 41b...capturing member 42…Steel chain 43a, 43b...elastic body 45a, 45b, 45c, 45d...Support members 50... Fallen object trap 100…Guessing system 103...Information Management System In addition, the same symbols in each drawing indicate the same or corresponding parts.

Claims

1. A method for estimating an amount of accumulated runoff in a runoff trap that traps runoff in a sabo dam, comprising the steps of: a displacement measuring step of measuring a change in position of a flexible capturing member that is incorporated in the flow-down object capturing body, is permeable to flowing water, and is capable of capturing the flow-down object, to obtain displacement information; and an accumulation amount estimation process for calculating the tensile load applied to the capture member and the amount of deflection of the capture member based on the displacement information and preset information about the capture member, calculating an upper load applied to the capture member based on the calculated tensile load and the amount of deflection, and estimating the accumulation amount of the flow-down material in the flow-down material capture body based on the calculated upper load and preset specific gravity information of the flow-down material.

2. A flow-down object capture body and information management system for capturing flow-down objects at a sabo dam, The flow-down object capture body is a flexible capture member that is disposed in a flow path of the flowing water so as to cross the flow direction of the flowing water, is permeable to the flowing water, and is capable of capturing the flow-down object; a support member capable of removably fixing the capture member in the flow channel; a displacement measuring device for measuring a change in the position of the capturing member to obtain displacement information; a notification device that obtains the displacement information and notifies the information management system outside the information management system; The information management system calculates the tensile load applied to the capture member and the amount of deflection of the capture member based on the displacement information and preset information of the capture member, calculates the upper load applied to the capture member based on the calculated tensile load and the amount of deflection, and estimates the amount of accumulation of the flow-down material in the flow-down material capture body based on the calculated upper load and preset specific gravity information of the flow-down material.

3. 3. The drift material capture body and information management system according to claim 2, wherein said capture member includes a steel chain and an elastic body for embedding said steel chain in a slackened state.

4. 4. The flow-down object capturing body and information management system according to claim 2, wherein the displacement information is an amount of extension of the capturing member.

5. The displacement measuring device is An apparatus main body fixed to the support member; a thread-like member having a single thread-like shape, one end of which is connected to the device body and is extendable and contractable with respect to the device body, and the other end of which is connected to the capture member; the device body includes a displacement information acquiring means for acquiring the displacement information by measuring the amount of elongation of the thread-like member, 5. The drift object capturing body and information management system according to claim 4, wherein the notification device is incorporated in the device body.

6. The drift object capturing body and information management system according to claim 5 , wherein the notification device notifies the displacement information wirelessly.

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