JP2010053602A - Permeable erosion control dam made of metal and sediment flow monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permeable erosion control dam made of metal, capable of detecting the capture of a sediment flow through the use of at least part of a body of the permeable erosion control dam made of metal without a fracture of the body, and provide a sediment flow monitoring system capable of notifying a person of the capture of a sediment flow. <P>SOLUTION: An acceleration sensor is installed to the back surface of a flange surface on which pipes 15 with flanges are connected to each other on the downstream side of a conduit 11 so as to detect changes in physical quantities caused in the pipes 15 with the flanges due to the capture of a sediment flow with a grid-like wall 14a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a metal transmission type sabo dam having a function of detecting that a debris flow has been captured, and a debris flow monitoring system capable of notifying a notification subject that a debris flow has been captured.

  Sabo dams are installed to protect private houses, facilities, roads, etc. from debris flows caused by heavy rains such as rainy season, typhoon, etc. Broadly classified types are known.

  In addition, since most of the sabo dams are made of concrete, most of the sabo dams are also non-permeable concrete sabo dams. However, in this impervious sabo dam several years after construction, earth and sand accumulate on the upstream side, and the function as a sabo dam is rapidly lost. Therefore, the capacity that can actually capture the debris flow is very small.

In the permeable sabo dam, which has improved the above-mentioned problems with the impervious sabo dam, small gravel and mud that normally flow are allowed to pass downstream, so the capacity to actually capture the debris flow when debris flow occurs. Big things can be secured. As such a transmission type sabo dam, a steel transmission type sabo dam has recently been seen (see, for example, Patent Document 1).

In addition, a system has been developed that detects when the stream of a river hits a dike and the soil is scraped away. In this system, an optical strain sensor consisting of an optical fiber and a weight attached to the optical fiber is embedded in the earth and sand of the levee, and when the levee is eroded by the flow of the river, the weight is exposed, and this weight It detects elongation strain generated in the optical fiber by weight (see, for example, Patent Document 2).
JP-A-7-82725 JP 2006-317461 A

  However, the steel transmission type sabo dam disclosed in Patent Document 1 has the following problems.

1) This steel transmission type sabo dam has the basic function of having a large capacity capable of capturing debris flow. However, this steel transmission sabo dam itself does not have any means to detect that the debris flow has been captured in the first place. There is no way to know if you did.
2) Therefore, when a debris flow occurs, it is not possible to immediately go to the site to check the soundness of the steel transmission type sabo dam, repair it if necessary, or issue an evacuation warning to the residents.
3) In addition, after the debris flow subsided, there was a problem that it was impossible to immediately remove the stone from the steel transmission type sabo dam and prepare for the next debris flow.

  Moreover, the following problems exist in the optical strain sensor disclosed in Patent Document 2 and the levee monitoring system using the same.

1) Since the above-mentioned optical strain sensor is embedded in the earth and sand of the levee and functions only when the levee itself is eroded by water, there is a problem that the levee main body is damaged in principle.
2) In addition, this system detects erosion (scouring) in the width direction of the water channel, and in the first place detects the movement of the water channel flow direction (that is, debris flow with respect to the steel transmission type sabo dam). Is not intended.

  An object of the present invention is to use at least a part of a metal transmission type sabo dam main body, and to detect that a debris flow is captured without damaging the main body. Another object of the present invention is to provide a debris flow monitoring system capable of notifying a notification subject that a debris flow has been captured.

In order to achieve this object, the invention according to claim 1 of the present invention provides:
A metal transmission type sabo dam body installed in a water channel having a specific width, and the metal transmission type sabo dam body because at least a part of the metal transmission type sabo dam body captures debris flow A debris flow detection sensor attached to a part of the metallic transmission-type sabo dam main body to detect a change in a physical quantity occurring in at least a part of the sabo dam main body. A type of sabo dam.

The invention according to claim 2 is the invention according to claim 1,
The metal transmission-type sabo dam main body has a lattice-like wall formed by combining a plurality of steel members so as to intersect vertically and horizontally, and this lattice-like wall crosses the water channel in the width direction. It is the structure erected in.

The invention according to claim 3 is the invention according to claim 2,
The steel member has a configuration in which a flanged pipe is connected.

The invention according to claim 4 is the invention according to claim 1,
The metal transmission-type sabo dam body includes a plurality of lattice walls formed by combining a plurality of steel members so as to intersect vertically and horizontally, and the plurality of lattice walls extend in the width direction of the water channel. In addition to being erected so as to cross, the plurality of grid-like walls are connected in the flow direction of the water channel, and have a plurality of steel connecting members for assembling in a bowl shape.

The invention according to claim 5 is the invention according to claim 4,
The steel member and the steel connecting member have a configuration in which a flanged pipe is connected.

The invention according to claim 6 is the invention according to claim 5,
At least one debris flow detection sensor is attached to the plurality of steel connecting members, and the position of the attached debris flow detection sensor is a back surface of a flange surface to which the flanged pipes are connected, and It is the downstream of the water channel.

The invention according to claim 7 is the invention according to any one of claims 1 to 6,
The debris flow detection sensor is an acceleration sensor, and the acceleration sensor is provided with a protective member for protecting the acceleration sensor from the debris flow and the external environment.

  The invention described in claim 8 is directed to a notification target person based on the debris flow detection signal detected by the debris flow detection sensor that constitutes the metal transmission type sabo dam according to any one of claims 1 to 7. It is a debris flow monitoring system provided with a notification means for notification.

The invention according to claim 9 is the invention according to claim 8,
The notifying unit amplifies the debris flow detection signal, a record storing unit for recording and storing the signal amplified by the amplifier, and transmits a signal output from the record storing unit to a notification subject. And a communication means.

The invention according to claim 10 is the invention according to claim 8 or 9, wherein
The notification means is installed at a predetermined location outside the metal transmission-type sabo dam main body constituting the metal transmission-type sabo dam according to any one of claims 1 to 7. To do.

The invention according to claim 11 is the invention according to claim 8 or 9, wherein
The said notification means is installed in a part of said metal transmission-type sabo dam main body which comprises the metal transmission-type sabo dam of any one of Claims 1-7, It is characterized by the above-mentioned.

As described above, according to the metal transmission type sabo dam according to the present invention,
A metal transmission type sabo dam body installed in a water channel having a specific width, and the metal transmission type sabo dam body because at least a part of the metal transmission type sabo dam body captures debris flow A debris flow detection sensor attached to a part of the metal transmission type sabo dam body in order to detect a change in physical quantity occurring in at least a part of the sabo dam body, so that the metal transmission It is possible to detect that a debris flow has been captured using the main sabo dam main body and without causing damage to the main body.

Moreover, according to the debris flow monitoring system according to the present invention,
Notify the person who has captured the debris flow because it is equipped with a notification means for notifying the notification target person based on the debris flow detection signal detected by the debris flow detection sensor that constitutes the metal transmission type sabo dam Can be notified. In addition, since the person to be notified can know that the debris flow has been captured, when the debris flow occurs, immediately go to the site to check the soundness of the steel permeable sabo dam and repair as necessary. It is also possible to give evacuation warnings to residents. Furthermore, after the debris flow has subsided, the above-mentioned steel transmission type sabo dam can be immediately removed to prepare for the next debris flow.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a front view of a steel transmission type sabo dam according to an embodiment of the present invention (viewed from the upstream side), FIG. 2 is a side view thereof, and FIG. 3 is an enlarged view of a portion A and a portion B shown in FIG. 4 is a view in the direction of arrow C in FIG. 3 (viewed from the downstream side), FIG. 5 is an enlarged sectional view of the portion D shown in FIG. 4 viewed from the direction E, and FIG. 6 is a debris flow according to an embodiment of the present invention. It is explanatory drawing which illustrates the outline | summary of a monitoring system typically.

  First, the structure of the steel transmission type sabo dam and debris flow monitoring system according to the present invention will be described.

  1 to 6, 10 is a dam, 11 is a water channel having a specific width provided at a predetermined location of the dam 10, 12 is a flanged pipe for constituting a steel vertical member, and 13 is steel. 14a, 14b are a plurality of steel vertical members formed by connecting flanged pipes 12 and a plurality of steel members formed by connecting flanged pipes 13 to each other. A grid-like wall 15 formed by combining the cross members of each other in a crossing manner, 15 constitutes a steel connection member for connecting the grid-like walls 14a and 14b in the flow direction of the water channel 11 and assembling them in a bowl shape. 16 is an acceleration sensor as a debris flow detection sensor, 17 is a hard putty as a protective member for protecting the acceleration sensor 16 from debris flow and the external environment, and 18 is an acceleration sensor. 6 is a cable for transmitting the debris flow detection signal detected by 6, and 19 is an amplifier (not shown) for amplifying the debris flow detection signal transmitted by the cable 18 for recording and storing the amplified signal. A data logger as a recording storage means, 20 is an amplifier, an existing commercial power supply (AC100V) for supplying power to the data logger 19 and various data processing personal computers (not shown), and 21 is a signal output from the data logger 19 Is a fiber optic cable as a communication means for transmitting information to a manager as a notification target person, 22 is an optical communication router installed under the manager to which the optical fiber cable 21 is connected, and 23 is a light This is a personal computer for collecting the signals via the communication router 22.

  The steel transmission-type sabo dam body is made of steel in which grid-like walls 14a and 14b, the above-described steel connecting members and flanged pipes for supporting the grid-like wall 14b from the downstream side are connected. It is composed of diagonal materials.

  The amplifier, data logger 19 and various data processing personal computers are stored in a waterproof storage box and installed in a predetermined and stable place.

  The notification means for notifying the administrator based on the debris flow detection signal detected by the acceleration sensor 16 includes at least the amplifier, the data logger 19, and the optical fiber cable 21.

  Next, regarding the mechanism for detecting the change in physical quantity occurring in at least a part of the main body by the acceleration sensor 16 due to at least a part of the steel transmission type sabo dam main body capturing the debris flow, the following is described. Explained.

  In general, a large impact force caused by the debris flow is exerted on the grid wall 14a installed on the upstream side of the grid wall 14b installed on the downstream side and also downward in the grid wall 14a. The impact force due to the debris flow is transmitted to the A part and the B part shown in FIG. 2 through the flanged pipe 15 constituting the connecting member, and the acceleration sensor 16 provided in each of the A part and the B part is used for the magnitude of acceleration. It is detected as (change in physical quantity). This detected signal is a debris flow detection signal. Further, as these debris flow detection signals, the debris flow detection signals obtained by the acceleration sensor 16 provided in the B portion are larger than the debris flow detection signals obtained by the acceleration sensor 16 provided in the A portion. Thus, a part of the steel transmission type sabo dam main body, that is, in this embodiment, the A part and the B part also function as a part (or amplifier) of the measuring device, and the main body is damaged. It is possible to detect that the debris flow has been captured even without the

  The debris flow detection signals respectively obtained by the acceleration sensors 16 provided in the A part and the B part are transmitted by the cable 18, amplified by the amplifier, and then recorded and stored in the data logger 19. Further, each debris flow detection signal recorded and stored in the data logger 19 is appropriately processed by a personal computer, transmitted to the optical communication router 22 installed under the administrator by the optical fiber cable 21, and the above-mentioned via the optical communication router 22. Each signal is collected on a personal computer. Therefore, it is possible to notify the manager that the debris flow has been captured. In addition, since the administrator can know that the debris flow has been captured, when the debris flow occurs, immediately go to the site, check the soundness of the steel transmission sabo dam, repair as necessary, Evacuation warnings can be issued to residents. Furthermore, after the debris flow has subsided, the above-mentioned steel transmission type sabo dam can be immediately removed to prepare for the next debris flow.

  In the present embodiment, the transmission-type sabo dam body is configured by connecting the grid-like walls 14a and 14b, the above-described steel connecting members, and a flanged pipe for supporting the grid-like wall 14b from the downstream side. Although the example comprised from the made steel diagonal material was demonstrated, it is not necessarily limited to this. For example, only one grid wall may be used, or various types of walls may be considered. Moreover, although the transmission type sabo dam main body demonstrated what used steel from the point of intensity | strength and cost, it was not necessarily limited to this and various metal materials can be used. Moreover, although the example in which a pipe with a flange is connected has been described with respect to vertical and horizontal members, connecting members, and the like constituting the transmission type sabo dam main body, it is not necessarily limited thereto.

  In this embodiment, an example in which an acceleration sensor is used as a debris flow detection sensor has been described. However, the present invention is not necessarily limited to this, and various devices such as a load sensor, a vibration sensor, and an acoustic sensor can be used. . For example, when a vibration sensor is used as a debris flow detection sensor, the vibration amplitude of the transmission-type sabo dam body increases upward due to the impact force of the debris flow, so that the debris flow detection signal obtained from the vibration sensor also increases upward. The tendency is different from the case of using. It is possible to make use of such features according to the sensors used.

  Further, in the present embodiment, taking into consideration that the possibility of directly receiving a debris flow is low, it is the back surface of the flange surface to which the flanged pipes 15 for constituting the connecting member of the acceleration sensor are connected, and Although the example installed in the downstream of the water channel 11 was demonstrated, it is not necessarily limited to this, For example, as long as there exists an effect of this invention, such as the inside of a steel pipe, various attachment positions can be considered.

  Further, in the present embodiment, debris flow detection signals having different sizes are obtained from the acceleration sensors 16 provided in the A part and the B part as described above, and logical sum calculation is performed using these signals. It is also possible to perform a logical product operation. By performing such processing, it becomes possible to increase signal redundancy and to construct a highly accurate debris flow monitoring system.

  In the present embodiment, an example of a system based on the premise that an existing commercial power supply (AC 100 V) can be used as the debris flow monitoring system has been described. However, the present invention is not necessarily limited thereto. For example, it is also possible to employ a solar system instead of a commercial power supply (AC 100V). Moreover, although the example in which the debris flow detection signal is transmitted to the manager using the optical fiber cable 21 as the communication means has been described, the present invention is not necessarily limited thereto. For example, a wireless communication system such as satellite communication can be employed.

  In the present embodiment, the administrator is described as an example of the notification subject, but the present invention is not necessarily limited to this. For example, various persons such as neighbors other than the manager are subject to notification.

  Moreover, in this embodiment, although the debris flow monitoring system demonstrated the example installed in the predetermined | prescribed location outside a transmission type sabo dam main body, it is not necessarily limited to this. For example, the above-described solar system, wireless communication system, or the like can be adopted, and the debris flow monitoring system itself can be installed in a part of the transmission type sabo dam body.

It is a front view (viewed from the upstream side) of the steel transmission type sabo dam of one embodiment of the present invention. It is the same side view. It is the A section and B section enlarged view shown in FIG. FIG. 4 is a view in the direction of arrow C (viewed from the downstream side) of FIG. 3. It is the expanded sectional view which looked at the D section shown in Drawing 4 from the E direction. It is explanatory drawing which illustrates typically the outline | summary of the debris flow monitoring system of one Embodiment of this invention.

Explanation of symbols

10: Dam 11: Waterways 12, 13, 15: Flange pipes 14a, 14b: Lattice wall 16: Acceleration sensor 17: Hard putty 18: Cable 19: Data logger 20: Commercial power supply (AC100V)
21: Optical fiber cable 22: Optical communication router 23: Personal computer

Claims (11)

  A metal transmission type sabo dam body installed in a water channel having a specific width, and the metal transmission type sabo dam body because at least a part of the metal transmission type sabo dam body captures debris flow A debris flow detection sensor attached to a part of the metallic transmission-type sabo dam main body to detect a change in a physical quantity occurring in at least a part of the sabo dam main body. Type sabo dam.   The metal transmission-type sabo dam main body has a lattice-like wall formed by combining a plurality of steel members so as to intersect vertically and horizontally, and this lattice-like wall crosses the water channel in the width direction. The metal transmission type sabo dam according to claim 1, wherein the metal transmission type sabo dam is constructed upright.   The metal transmission-type sabo dam according to claim 2, wherein the steel member has a configuration in which a flanged pipe is connected.   The metal transmission-type sabo dam body includes a plurality of lattice walls formed by combining a plurality of steel members so as to intersect vertically and horizontally, and the plurality of lattice walls extend in the width direction of the water channel. 2. A structure comprising: a plurality of steel connecting members that are erected so as to cross and connect the plurality of grid-like walls in the flow direction of the water channel, and are assembled in a bowl shape. Metal transmissive sabo dam as described.   The metal transmission-type sabo dam according to claim 4, wherein the steel member and the steel connecting member have a configuration in which a flanged pipe is connected.   At least one debris flow detection sensor is attached to the plurality of steel connecting members, and the position of the attached debris flow detection sensor is a back surface of a flange surface to which the flanged pipes are connected, and The metal transmission type sabo dam according to claim 5, which is downstream of the water channel.   The debris flow detection sensor is an acceleration sensor, and the acceleration sensor is provided with a protection member for protecting the acceleration sensor from the debris flow and the external environment. The metal transmission type sabo dam as described in the item.   A notification means is provided for notifying a notification target person based on a debris flow detection signal detected by the debris flow detection sensor constituting the metal transmission-type sabo dam according to any one of claims 1 to 7. Debris flow monitoring system.   The notifying unit amplifies the debris flow detection signal, a record storing unit for recording and storing the signal amplified by the amplifier, and transmits a signal output from the record storing unit to a notification subject. The debris flow monitoring system according to claim 8, further comprising: a communication unit.   The notification means is installed at a predetermined location outside the metal transmission-type sabo dam main body constituting the metal transmission-type sabo dam according to any one of claims 1 to 7. The debris flow monitoring system according to claim 8 or 9.   The said notification means is installed in a part of said metal transmission-type sabo dam main body which comprises the metal transmission-type sabo dam of any one of Claims 1-7. Item 10. The debris flow monitoring system according to Item 8 or 9.

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