JP7624174B2 - Method for estimating drift material accumulation volume, drift material capture body, and information management system - Google Patents

Description

The present invention relates to a method for estimating the amount of accumulated drift material, a drift material capture body , and an information management system , and more particularly to a drift material capture body that captures drift material in a sabo dam and a method for estimating the amount of accumulated drift material in such a drift material capture body.

Erosion control dams are known as structures used to prevent landslides in mountain streams. Erosion control dams allow water to pass through while capturing downstream debris such as sediment, gravel and driftwood carried along by debris flows and floods, thus protecting conservation targets downstream.

However, in recent years, sabo dams alone have been unable to capture the large amounts of runoff caused by the effects of increasingly large typhoons and floods, and there have been cases where runoff that has flowed down or overflowed the sabo dams has reached conservation targets downstream.

To deal with such cases, there is a conventional fluid capture structure that can capture fluids such as driftwood that have not been captured by sabo dams and have overflowed (Patent Document 1).

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

Referring to these figures, the fluid capture structure 71 is composed of fluid capture bodies 72a to 72c, which are roughly U-shaped in plan view and are arranged in three rows in a direction perpendicular to the flowing water direction.

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 materials 77a, 77b that are parallel to the flow direction and incline downward from the downstream side to the upstream side, and first cross bars 78a-78c that are attached to cross the capture materials 77a, 77b. The first cross 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 cross bars 78b and 78c has the same configuration as the first cross bar 78a.

By configuring it in this way, 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, improving the efficiency of capturing the fluid while preventing the flow of water from being blocked.

The fluid capture structure 71 described above loses its capture capacity when the amount of captured fluid, such as driftwood, exceeds the capture limit, but the fluid capture structure 71 cannot detect the generation of fluid or the accumulation state of fluid. Therefore, a visual inspection was required at the site where the fluid capture structure 71 was installed to check for the presence or absence of fluid and to consider the need for tree removal.

However, visual inspection of the fluid capture structures 71, which are mainly installed in mountainous regions, is dangerous. This is especially true 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 site 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 costs.

Note that there are currently debris flow detection systems (Patent Document 2) and detection devices (Patent Document 3) that detect debris flows.

Figure 18 is a plan view of a steel see-through sabo 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.

First, referring to Figs. 18 to 21, 80 is a dam, 81 is a waterway with 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 flanged pipes 82 and a plurality of steel horizontal members formed by connecting 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 impacts (e.g., debris flow, etc.) applied to the steel transparent sabo dam body, 87 is hard putty as a protective member for protecting the accelerometer 86 from debris flow and the external environment, and 88 is a cable for transmitting the acceleration signal detected by the accelerometer 86 to an external signal processing unit.

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

22 to 24, the detection device 90 is composed of 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 wound in a spiral shape around the tubular switch 91 and the wire ropes 92a, 92b. The tubular switch 91 is equipped with 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 rockfall.

The detection device 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 that a rockfall has occurred and the location of the rockfall. When the detection circuit detects a rockfall, the signal is transmitted to an alarm device, which issues an alarm using a siren, voice, etc.

JP 2019-090307 A JP 2011-021446 A JP 2003-149013 A

However, the conventional debris flow detection system and detection device 90 described above only detect the occurrence and passing of debris flows, and do not detect the presence or absence of accumulation of fluid material or 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.

The present invention has been made to solve the above-mentioned problems, and has an object to provide an economical and safe method for estimating the amount of drift material accumulated, a drift material capture body , and an information management system .

In order to achieve the above-mentioned object, the invention described in claim 1 is a method for estimating the amount of accumulated flow material in a flow material capture body that captures flow material in a sand-control dam, and comprises a displacement measurement step of measuring a change in position of a flexible capture member that is incorporated in the flow material capture body, is permeable to flow water, and is capable of capturing flow material, to obtain displacement information, and an accumulation amount estimation step of 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 the upper load applied to the capture member based on the calculated tensile load and deflection, and estimating the amount of accumulated flow material in the flow material capture body based on the calculated upper load and preset information about the specific gravity of the flow material .

In this way, the capture material can be used to estimate the amount of deposition.

The invention described in claim 2 is a flow-down object capture body and information management system that captures flow-down objects at a sand-control dam, the flow-down object capture body comprising a flexible capture member that is arranged in the flow path of the flowing water so as to cross the direction of the flowing water, and is permeable to the flowing water and capable of capturing flow-down objects, a support member that can fix the capture member in a detachable manner in the flow path, a displacement measuring device that measures changes in the position of the capture member to obtain displacement information, and an alarm device that obtains the displacement information and alarms it to an external 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 about the capture member, calculates the surplus load applied to the capture member based on the calculated tensile load and amount of deflection, and estimates the amount of accumulated flow-down objects in the flow-down object capture body based on the calculated surplus load and preset information about the specific gravity of the flow-down object .

By configuring it in this way, the information needed to estimate deposition volume can be obtained without going to the site.

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

When configured in this way, the elastic body stretches particularly easily when the floating object is captured. In addition, the force applied to the capturing member due to the collision of the floating object is absorbed by the stretching of the steel chain and the compression of the elastic body between the steel chains.

The invention described in claim 4 is the configuration of the invention described in either claim 2 or claim 3, in which the displacement information is the amount of extension of the capture member.

This configuration allows you to get a more specific understanding of the state of the capture member.

The invention described in claim 5 is the configuration of the invention described in claim 4, in which the displacement measuring device 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 capture member, the device main body comprises 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.

With this configuration, the amount of stretch of the capture member can be grasped using a simple structure.

The invention described in claim 6 is the same as the invention described in claim 5, in which the notification device notifies the displacement information wirelessly.

This configuration eliminates the need for wiring work during installation.

As explained above, the invention described in claim 1 allows the use of a capture member to estimate the amount of accumulated material, making it an economical and safe method for estimating the amount of accumulated material.

The invention described in claim 2 allows the information necessary to estimate the amount of deposition to be obtained without going to the site, reducing the number of visual inspections required on-site, making it more economical and safer.

In addition to the effects of the invention described in claim 2, the invention described in claim 3 has an elastic body that is particularly easy to stretch when capturing floating objects. Also, the force applied to the capturing member due to the collision of the floating objects 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 that combines high capturing performance, cushioning performance, and durability.

The invention described in claim 4 has the same effect as the invention described in claim 2 or 3, and in addition, it allows the state of the capture member to be grasped more specifically, allowing for more accurate confirmation of the situation and a more accurate determination of the need for maintenance and inspection.

The invention described in claim 5 has the same effect as the invention described in claim 4, but in addition, it is possible to grasp the amount of elongation of the capture member using a simple structure, thereby reducing the cost of the displacement measuring device and the notification device and increasing the accuracy of the displacement information.

The invention described in claim 6 has the same effect as the invention described in claim 5, but in addition, it eliminates the need for wiring work during installation, shortening construction time and reducing installation costs.

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. 2 is an enlarged view of a "V" portion shown in FIG. 1 and a schematic diagram of a displacement measuring device. 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. 2 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 is captured; 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. 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. FIG. 7 is an enlarged view of the “X” portion shown in FIG. 6 . FIG. 8 is a plan view of the drift object capture body shown in FIG. 7 . 8 is a cross-sectional view of line IX-IX shown in FIG. 7. FIG. 7 is a front view of the drift object capturing body shown in FIG. 6 in a state in which the drift object is captured. FIG. 11 is an enlarged view of a portion “Y” shown in FIG. 10 . 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. FIG. 13 is a plan view of the flow-down object capture body shown in FIG. 12 . 13 is a cross-sectional view taken along line XIV-XIV shown in FIG. 12. FIG. 1 is a schematic plan view showing a conventional fluid object capture structure. 16 is a view taken along the arrows of line XVI-XVI shown in FIG. 15. 16 is a view taken along the arrows of line XVII-XVII shown 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. FIG. 1 is a plan view of a steel see-through sabo dam using a conventional debris flow detection system. 19 is a side view of line XIX-XIX shown in FIG. 18. FIG. 20 is an enlarged view of a portion “Z” shown in FIG. 19 . This is a cross-sectional view (seen from the downstream side) of the XXI-XXI line shown in Figure 20. FIG. 1 is a diagram showing a conventional detection device. FIG. 23 is a diagram showing an example of a tubular switch employed by the detection device shown in FIG. 22. FIG. 23 is a diagram showing an example of installation of the detection device shown in FIG. 22.

Figure 1 shows 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, Figure 2 shows an enlarged view of the "V" portion shown in Figure 1 and a schematic diagram of a displacement measurement device, and Figure 3 shows a block diagram of the displacement measurement device shown in Figure 2 and an overall configuration diagram of an estimation system including the displacement measurement device.

First, referring to (1) and (2) of Figure 1, a flow-down object capture body 10 is installed in the flow path 2 (water beating section) of the erosion control dam 1 in order to capture flow-down objects (described later) at the erosion control dam 1. In addition, 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.

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

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, fixing 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 of the flowing water in the flow path 2 of the flowing water. The capture member 11b is provided in the middle of the flow direction of the flowing water, and the capture member 11a is provided above the capture member 11b, i.e., near the upper end of the incline. The support member 15 is also detachably fixed to the bottom surface of the flow path 2 by anchor bolts 16 at the fixing parts 152a and 152b. In other words, the support member 15 is configured to be able to detachably fix the capture members 11a and 11b in the flow path 2.

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 a state in which parts of the steel chain 12 are loosened near each end of the steel chain 12. The capture member 11b as a whole is flexible, permeable to flowing water, and capable of capturing objects that flow down the stream.

When configured in this manner, the elastic body 13 is particularly likely to stretch when capturing floating objects, as described below. In addition, 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 configuration to the capturing member 11b.

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

The displacement measuring device 20 comprises a device body 21 fixed to the support member 15 via an attachment member 17, and a filamentary 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 23 of the filamentary member 22 is connected to the device body 21, and the other end 24 is connected to the capture member 11a, and the filamentary member 22 is stretched without slack between the device body 21 and the capture member 11a.

The device body 21 is provided with a pulley 25. The pulley 25 is connected to a bracket 27 that is fixed to the mounting member 17 and a shaft 26 that connects 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 can rotate freely about the shaft 26 from a reference position (the position shown in (1) of Figure 2) and is biased to return to the reference position.

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

The mounting member 17 is provided with a guide roller 18 at a position that is on the upstream side when mounted, and the thread-like member 22 pulled out from the pulley 25 travels upstream via the guide roller 18 and extends to the capture member 11a through a through hole 157 provided in the 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 at the center of the capture member 11a where the steel chain 12 is exposed.

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

Now, referring to FIG. 3, the displacement measuring device 20 constitutes an estimation system 100 including an information management system 103 consisting of cloud computing, etc., which is made up of a server, storage, a network, etc.

In the estimation system 100, when the displacement information acquisition means 28 obtains displacement information, the notification device 29 notifies the base station 104, which acts as a relay station, of the displacement information by wireless communication using the 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, tablet terminal, personal computer, or the like, via a network 105 such as the Internet, the stored measurement results are provided to the information processing device 102. The effects of this configuration will be described later.

Figure 4 shows a side view and a partially enlarged side view of the drift catcher shown in Figure 1 after capturing drift.

First, referring to FIG. 4 (1), 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 mentioned above, the capture member 11a is fixed by the support member 15, and is configured to be easily stretched from the elastic body 13 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.

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 capture member 11a, so that it is pulled out relative to the device body 21. 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.

Then, based on the rotation information of the device body 21 of the displacement measuring device 20, the displacement information acquisition means 28 sequentially measures the amount of elongation of the thread-like member 22 and the amount of elongation of the capture member 11a by conversion, and obtains displacement information (displacement measurement process).

Now, 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.

In the information management system 103, when the reported 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 first 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 flow-down material 6 in the flow-down material capture body 10 related to the flow-down material 6 is estimated based on the calculated upper load and the preset specific gravity information of the flow-down material (deposition amount estimation process). The estimated flow-down material deposition amount obtained in this manner 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 flow-down material deposition amount (measurement result) to the user on a screen display. As a display method, for example, a graph showing the change over time and the measurement result can be used. The estimated amount of sediment accumulated in this way is used as information for visual inspection and for determining whether removal work is necessary.

In this way, the capture member 11a can be used to estimate the amount of accumulated flow-down material, making it an economical and safe method for estimating the amount of accumulated flow-down material.

In addition, this configuration allows the information necessary to estimate the amount of deposition to be obtained without going to the site, reducing the number of visual inspections required on-site, making it more economical and safer.

Furthermore, the condition of the capture member 11a can be grasped more specifically, allowing for more accurate confirmation of the situation and determination of the need for maintenance and inspection.

Furthermore, the amount of elongation of the capture member 11a can be grasped using a simple structure, which reduces the costs of the displacement measuring device 20 and the alarm device 29 and increases the accuracy of the displacement information.

In addition, since no wiring work is required for installation, construction time can be shortened and installation costs can be reduced.

Figure 5 shows a partially enlarged side view of a flow-down object capture body according to a second embodiment of the present invention, which corresponds to Figure 2 (1) of the first embodiment, and a partially enlarged front view.

The configuration of the flow-down object capture body 30 according to the second embodiment is basically the same as the flow-down object capture body 10 according to the first embodiment described above, so the following explanation will focus on the differences.

Referring to the figure, the flow-down object capture body 30 is a displacement measuring device 20 that is retrofitted to the support member 15 and capture member 11a that are already installed in the flow path 2.

The displacement measuring device 20 is attached to the mounting member 17, and the frame 34, which is made up of a plate-like installation member 31 that is U-shaped in side view 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, so that it is retrofitted to the support member 15. With this configuration, it is possible to easily add the function of estimating the amount of flow-down accumulation to existing equipment.

Figure 6 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 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 the IX-IX line shown in Figure 7.

First, referring to Figure 6, in order to capture drifting debris at the sabo 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 sabo dam 1. Note that in Figure 6, the front side of the page is the downstream side, and the back side of the page is the upstream side.

The flow-down object capture body 40 comprises capture members 41a and 41b, support members 45a to 45d, and a displacement measurement device 20. Note that the displacement measurement device 20, the displacement measurement process, and the deposition amount estimation process are the same as those in the first embodiment described above, and therefore will not be described in detail here.

6 to 9, the capture 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 capture member 41a as a whole is flexible and permeable to flowing water, making it possible to capture the flowing object. With this configuration, the elastic bodies 43a and 43b are particularly likely to stretch when capturing the flowing object. In addition, the force applied to the capture member 41a due to the collision of the flowing object is absorbed by the stretching of the steel chain 42 and the elastic body 43 outside the steel chain 42, and the compression of the elastic body 43 between the steel chains 42, so that the capture member 41a has high capture performance, cushioning performance, and durability. The capture member 41b has a similar configuration. The capture members 41a and 41b are connected via a connecting chain 44 that is hung around the center of each of them.

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 the end of the capture member 41a. Each of the support members 45b-45d has a similar configuration, and fixes 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.

The 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.

Figure 10 is a front view of the drift catcher shown in Figure 6 after capturing drift, and Figure 11 is an enlarged view of the "Y" portion shown in Figure 10.

First, referring to FIG. 10, driftwood (driftwood) 6 is captured by the capture members 41a and 41b of the driftwood capture body 40. 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 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 capture member 41a stretches due to the weight of the driftwood 6.

Now, referring to FIG. 11, following the stretching of the capture member 41a (elastic body 43a), the thread-like member 22 stretches so as to be pulled out from the device body 21, and as the thread-like member 22 stretches, 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. From this rotation information, displacement information that is the amount of stretching of the capture member 41a is obtained (displacement measurement process), and the amount of accumulated material in the flow-down material capture body 40 related to the flow-down material 6 is estimated based on the displacement information (accumulation amount estimation process).

In this way, the capture member 41a can be used to estimate the amount of accumulated flow-down material, making it an economical and safe method for estimating the amount of accumulated flow-down material.

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.

The configuration of the flow-down object capture body 50 according to the fourth embodiment is basically the same as the flow-down object capture body 40 according to the third embodiment described above, so the following explanation will focus on the differences.

Referring to these figures, the flow-down object capture body 50 is a displacement measuring device 20 that is retrofitted to the capture member 41a and support member 45a that are already installed in the flow path 4.

The mounting member 58 on which the displacement measuring device 20 is attached has a plate-like shape that is roughly L-shaped when viewed from the front, is arranged so as to cover the upper end side of the capture member 41a, and is fixed to the 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 the upper surface 59 of the mounting member 58. With this configuration, it is possible to easily add a function for estimating the amount of flow-down accumulation to existing equipment while maintaining the fixed state of the capture member 41a by the fixing plate 47.

In addition, in each of the above embodiments, a displacement measurement process is performed in which the amount of extension of the capture member is 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 capture member is used as displacement information and this is measured.

In addition, in each of the above embodiments, the capture member has a specific structure consisting 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, or a woven wire rope. The capture member may include a rigid member in part, and may include at least a stretchable portion in part.

Furthermore, in each of the above embodiments, the capture member has a specific shape, but it may have other shapes as long as it is arranged to cross the direction of the flowing water, is permeable to the flowing water, and can capture the flowing matter. For example, it may be in the shape of a mesh, a lattice, a screen, etc.

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 the capture member can be detachably fixed in the flow path.

Furthermore, in each of the above embodiments, the thread-like member is stretchable, but it may be designed not to stretch but to simply rotate the device body.

Furthermore, in each of the above embodiments, the thread-like member is made of a wire, but it may be any member having a single thread-like shape.

Furthermore, 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 thread-like member and the capturing member to obtain displacement information. Also, other measuring devices may be used that measure the change in the position of other capturing members to obtain displacement information.

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

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

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

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.

Furthermore, in each of the above embodiments, the notification device notifies wirelessly, but it may also notify via wired communication.

Furthermore, in each of the above embodiments, the notification device notifies an external information management system, but it is sufficient if it notifies the outside of the displacement information. For example, it may simply be an alarm, etc.

Furthermore, in each of the above embodiments, the notification device is built into the device body, but it may be installed separately from the displacement measuring device.

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

Furthermore, in each of the above embodiments, the accumulation amount estimation process is performed by an information management system, but the accumulation amount estimation process may also be performed by a person based on the displacement information.

DESCRIPTION OF SYMBOLS 1...Sand-control dam 2...Flow path 4...Flow path 10...Floating object capture body 11a, 11b...Capturing member 12...Steel chain 13...Elastic body 15...Support member 20...Displacement measuring device 21...Device main body 22...Thread-shaped member 23...One end 24...Other end 28...Displacement information acquisition means 29...Alarm device 30...Floating object capture body 40...Floating object capture body 41a, 41b...Capturing member 42...Steel chain 43a, 43b...Elastic body 45a, 45b, 45c, 45d...Support member 50...Floating object capture body 100...Estimation system 103...Information management system.Note that the same symbols in each figure indicate the same or corresponding parts.

Claims (6)

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 . A flow-down object capture body and an 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. The drifting object 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. 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. 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. 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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