JP2007304061A - Electromagnetic flow rate sensor for river, and flow rate measuring device and system for river - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic flow rate sensor for a river, a flow rate measuring device for a river, and a flow rate measuring system for a river with excellent durability. <P>SOLUTION: The electromagnetic flow rate sensor 40 comprises a mount type housing 50 inclined toward both ends in the flow direction of a stream, and an inclined side wall 52 on the upstream side is upwardly inclined so as to be separated from a base panel 20 as from the upstream to the downstream. Thereby, an impact when a foreign substance having flowed from the upstream of the river 11 collides with the electromagnetic flow rate sensor 40 is eased, and the durability (reliability) is improved. Since the inclined side wall 52 on the upstream side inclines to the flow direction of the stream, it is prevented that flow-down matter is caught by the electromagnetic flow rate sensor 40. Since resistance of the stream is suppressed and the stream flows smoothly along the surface of the mount type housing 50, the flow rate can be stably measured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic flow velocity sensor for a river which is fixed to a support provided in a water flow of a river and can measure the flow velocity of the water flow, a flow velocity measuring device for a river including the electromagnetic flow velocity sensor for the river, and a river The present invention relates to a flow velocity measurement system for use.

  Understanding river flow rate (velocity) is one of the most important issues for river management. For example, in the case of torrential rain, on-time grasping of the river flow along the river basin to be warned is extremely useful for disaster prevention. If river flow can be measured accurately, it will be useful for river improvement plans, dam construction plans, water utilization, river water quality management, and research on the relationship between vegetation and ecosystems and river flow.

As a conventional river velocity measuring device developed for this purpose, one end of a spring material is fixed to the river bottom of the river, and a float (float) for measuring the water level at the other end of the spring material is used. It is known that a flow rate sensor is attached in the middle of the spring material and the flow rate sensor is always submerged (see, for example, Patent Document 1).
JP-A-10-197299 ([0012]-[0016], FIG. 4)

  However, in the conventional river flow velocity measuring apparatus described above, there is a possibility that a falling material such as driftwood flowing from the upstream collides with the flow velocity sensor and is damaged.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a river electromagnetic flow velocity sensor, a river flow velocity measuring apparatus, and a river flow velocity measurement system that are excellent in durability.

  The electromagnetic flow velocity sensor for a river according to the invention of claim 1 made to achieve the above object is fixed to a support wall surface substantially parallel to the flow direction of the water flow among the support members standing in the water flow of the river. An electromagnetic anemometer for rivers capable of measuring the flow velocity of the water flow, which is mounted on the support wall surface and is inclined toward both ends of the flow direction of the water flow, and on the top portion of the mount housing. It has a feature in that it includes a pair of detection electrodes arranged side by side and measures the flow velocity of the river based on the potential difference detected by the pair of detection electrodes. The “river” in the present invention includes irrigation channels and drainage channels.

  According to a second aspect of the present invention, in the river electromagnetic flow velocity sensor according to the first aspect, the mount type housing is formed by processing sheet metal or resin, and is housed inside the mount type housing and includes a pair of detection electrodes. A main body housing that holds electrical components is formed, and a through hole for detection is formed at the top portion of the mount-type housing, and a fitting protrusion that is fitted into the through hole for detection is formed in the main body housing. It is characterized in that a pair of detection electrodes are arranged in an exposed state.

  According to a third aspect of the present invention, in the electromagnetic flow velocity sensor for a river according to the second aspect, the mount-type housing is formed by bending the sheet metal with a plurality of folding lines extending vertically, and the top constituting wall is parallel to the water flow direction. And a pair of inclined side walls that are connected to both sides of the top constituent wall via a bent portion, and a pair of attachment pieces that are connected to the end portions of both inclined side walls via the bent portion. Each attachment piece is characterized in that attachment holes for fixing the attachment pieces to the support wall surface are formed.

  According to a fourth aspect of the present invention, in the river electromagnetic flow rate sensor according to the second aspect, the mount-type housing includes a dome portion formed by drawing a sheet metal, and an attachment piece projecting laterally from an edge portion of the dome portion. The mounting piece is characterized in that a mounting hole for fixing to the wall surface of the support is formed.

  A river flow velocity measuring device according to a fifth aspect of the invention comprises the river electromagnetic flow velocity sensor according to any one of the first to fourth aspects, and a base board fixed to a support wall surface. It is characterized in that a plurality of electromagnetic flow velocity sensors are mounted side by side.

  According to a sixth aspect of the present invention, in the river flow velocity measuring apparatus according to the fifth aspect, the base board is formed by holding the base frame extending vertically and the base sheet metal in a state where a gap is left between them. Includes a screw part for detachably mounting the mount-type housing, and a cable introduction hole for introducing a cable extending from each river electromagnetic flow rate sensor into a gap between the base frame and the base metal plate. And the cable is led out from the upper end opening of the gap between the base frame and the base sheet metal.

  The invention according to claim 7 is characterized in that, in the river flow velocity measuring device according to claim 5 or 6, the base board is detachable from the pier as a support.

  The invention of claim 8 is characterized in that in the river flow velocity measuring device according to any one of claims 5 to 7, the plurality of river electromagnetic flow velocity sensors are detachably fixed to the base board. .

  A ninth aspect of the invention is characterized in that, in the river flow velocity measuring device according to any one of the fifth to eighth aspects, the base board can be divided into a plurality of base board constituting bodies in the vertical direction.

  According to a tenth aspect of the present invention, in the river flow velocity measuring device according to any one of the fifth to ninth aspects, the fixing is swingably connected to both side edges of the base board by hinge pins extending in the vertical direction of the base board. It has a feature in that a fixing hole for fixing the base board to the support wall surface is formed in the fixing piece.

  A river flow velocity measuring system according to an invention of claim 11 is measured by the river flow velocity measuring device according to any one of claims 5 to 10 and a plurality of river electromagnetic flow velocity sensors provided in the river flow velocity measuring device. It has a feature in that it includes an information collecting device that collects the flow velocity information, and a transmission device that transmits the collected flow velocity information to the outside together with identification information for identifying the electromagnetic flow velocity sensor for rivers.

  According to a twelfth aspect of the present invention, in the river flow velocity measuring system according to the eleventh aspect, a plurality of supports are erected in the river width direction of the river, and a river flow velocity measuring device is attached to each of the plurality of supports. It has the characteristics.

[Invention of Claim 1]
The river electromagnetic flow velocity sensor according to claim 1 measures the flow velocity of the river by detecting a potential difference caused by the flow of river water crossing the magnetic field with a pair of detection electrodes. Here, the electromagnetic flow velocity sensor for rivers includes a mount-type housing that is attached to a support wall surface and is inclined toward both ends in the flow direction of the water flow, and a pair of detection electrodes is disposed on the top portion thereof. That is, the mount-type housing is inclined so as to gradually rise from the support wall surface as it goes from the upstream edge to the top portion. Thereby, the impact at the time of the fallen thing which flowed from the upstream of a river collides is relieved, and durability (reliability) can be improved. In addition, it is possible to prevent the spilled material from being caught by the electromagnetic flow velocity sensor for rivers. Furthermore, the resistance of the water flow is suppressed, and the water flow smoothly flows along the surface of the mount-type housing, so that the flow velocity can be measured stably.

[Invention of claim 2]
According to the second aspect of the present invention, since the main body housing is covered with the mount-type housing, it is possible to prevent the occurrence of the malfunction of the electrical component due to the collision of the flowing-down object.

[Invention of claim 3]
According to the invention of claim 3, since the mount-type housing is opened up and down, mud and sand can be prevented from accumulating inside the mount-type housing.

[Invention of claim 4]
According to the invention of claim 4, mud and sand can be prevented from entering the inside of the mount-type housing. Here, the outer surface shape of the dome portion may be a spherical surface, an elliptical spherical surface, or a polygonal truncated pyramid surface with a rounded ridgeline.

[Invention of claim 5]
In the river flow velocity measuring device according to claim 5, since the flow velocity is measured using the river electromagnetic flow velocity sensor according to any one of claims 1 to 4, durability is higher than that of a conventional river flow velocity measuring device. improves. In addition, the flow velocity can be measured at a plurality of positions in the depth direction of the river, and a rough water level can be measured according to the measurement result. Furthermore, even if any of the river electromagnetic flow velocity sensors malfunctions, the flow velocity can be continuously measured by another normal river electromagnetic flow velocity sensor.

[Invention of claim 6]
According to invention of Claim 6, the cable extended from the electromagnetic flow velocity sensor for rivers can be protected by a base board, and the disconnection of a cable, the catch of a fallen thing, etc. can be prevented.

[Invention of Claim 7]
According to the invention of claim 7, it is possible to install or remove a plurality of electromagnetic flow velocity sensors for rivers in a river flow at a time. The base board may be fixed with anchor bolts provided on the pier, or may be tied to the pier with a wire or the like.

[Invention of Claim 8]
According to the eighth aspect of the present invention, when a problem occurs in any of the river electromagnetic flow rate sensors, only the river electromagnetic flow rate sensor can be removed from the base panel and replaced.

[Invention of claim 9]
According to invention of Claim 9, the length of a base board can be adjusted according to the water level of a river, and the height of a support body, for example.

[Invention of Claim 10]
According to the tenth aspect of the present invention, since the fixed piece can swing around the hinge pin, even if the support wall surface is curved, the fixed plate can be directed to the support wall surface to fix the base board. . That is, the degree of freedom of the fixing position of the base board is improved.

[Invention of Claim 11]
In the river flow velocity measuring system according to claim 11, since the flow velocity is measured using the electromagnetic flow velocity sensor for river according to any one of claims 1 to 4, durability is higher than that of a conventional river flow velocity measuring system. improves. Also, flow velocity information measured by a plurality of river electromagnetic flow velocity sensors is collected by an information collecting device and transmitted to the outside together with identification information by a transmission device. Then, the flow velocity information of each river electromagnetic flow velocity sensor is collected in, for example, a management center, and the river flow velocity, flow rate, water level, and the like can be observed. This eliminates the need for an attendant to actually go to the river to perform measurement work, and allows the state of the river to be observed safely and at low cost. In addition, river flow velocity information can be collected in real time.

[Invention of Claim 12]
According to the configuration of the twelfth aspect, the flow velocity distribution and the average flow velocity of the river can be observed in the two directions of the river width direction and the water depth direction.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Reference numeral 10 in FIG. 1 is, for example, a concrete pier that is erected in the water flow of the river 11, and is erected in the width direction of the river 11 (in FIG. 1, only one pier 10 is provided. It is shown). Among these piers 10, river flow velocity measuring devices 90 according to the present invention are respectively attached to pier wall surfaces 10 </ b> A (corresponding to “support wall surfaces” of the present invention) that are substantially parallel to the flow direction of the water flow. The river flow velocity measuring device 90 includes a base board 20 fixed to the bridge pier wall surface 10A with, for example, anchor bolts (not shown), and a plurality of river electromagnetic flow velocity sensors 40 attached to the base board 20 side by side. Composed.

  As shown in FIG. 2, the base board 20 can be divided into a plurality of base board constituent bodies 21 in the vertical direction (longitudinal direction), and the plurality of base board constituent bodies 21 are arranged in a straight line on the pier wall surface 10A. Has been. Thereby, the length of the up-down direction of the base board 20 can be changed according to the height of the pier 10 or the water level of the river 11, for example. In addition, the length of the up-down direction of the base board structure 21 is 1 m, for example.

  As shown in FIG. 5, each base board constituent body 21 is formed by stacking and fixing a base frame constituent body 21 </ b> A and a base sheet metal constituent body 21 </ b> B extending vertically with a gap left therebetween. As shown in FIG. 4, a plurality of base frame components 21A are connected in the vertical direction to form one base frame 20A, and a plurality of base sheet metal components 21B are connected in the vertical direction to form a single base metal plate 20B. Has been.

  As shown in FIG. 7, the base frame structure 21A has a ladder structure. That is, a pair of vertical frame members 121, 121 extending vertically and parallel to each other, and a long plate-shaped horizontal frame member 122 that is passed so as to connect both ends and the center of the vertical frame member 121 in the vertical direction. The vertical frame member 121 and the horizontal frame member 122 are welded, for example. Both end portions of the horizontal frame member 122 protrude to the side of the vertical frame member 121, and an oval shape for fixing the base frame structure 21A (base board structure 21) to the pier wall surface 10A at the protruded portion. A fixing hole 22A is formed. That is, an anchor bolt (not shown) standing upright from the pier wall surface 10A is inserted into the fixing hole 22A, and a nut (not shown) is tightened on the anchor bolt to fix the base frame structure 21A (base board structure 21) to the pier wall surface 10A. Is done. Further, the vertical frame member 121 has a crank-like cross section in the vertical direction, and the base sheet metal constituting body 21B is addressed to the end of the vertical frame member 121 that is not welded to the horizontal frame member 122. The base frame constituting body 21 </ b> A and the base sheet metal constituting body 21 </ b> B are integrally fixed by bolts 23.

  Here, hooks are formed on the upper end portions of the base frame constituting body 21A and the base sheet metal constituting body 21B, respectively, and the hooks are engaged with each other, whereby the base frame constituting body 21A and the base sheet metal constituting body 21B are temporarily connected. While fixing, the hole which lets the volt | bolt 23 pass may be made to align. This facilitates the assembly of the base sheet metal structure 21B to the base frame structure 21A.

  The base sheet metal structure 21B has a long plate shape having the same length (specifically 1 m) as the base frame structure 21A, and is a base frame structure 21A with a folding line extending vertically on both sides in the lateral direction. The structure is bent toward the front. Specifically, as shown in FIG. 5, the intermediate portion of the base sheet metal structure 21B in the short direction (water flow direction) is parallel to the water flow direction and flat between the base frame structure 21A. The flat mounting wall 29 is formed with a gap 26, and both side portions are inclined flat walls 28 that are inclined so as to approach the base frame constituting body 21A as the distance from the mounting flat wall 29 increases.

  A maximum of three river electromagnetic flow velocity sensors 40 can be attached to the front surface of the base sheet metal structure 21B. As shown in FIG. 6, sensor attachment portions 24 are formed at a total of three locations, that is, a central portion in the vertical direction of the base sheet metal structure 21 </ b> B and a position separated by 0.25 m from the central portion to both ends. Yes. Each sensor mounting portion 24 is regularly formed with a plurality of mounting holes 24A for screwing the river electromagnetic flow velocity sensor 40, and the river electromagnetic flow velocity sensor 40 is based on the mounting holes 24A. It is detachably fixed to the panel structure 21.

  Each sensor mounting portion 24 has a cable introduction hole 27 for introducing a cable 42 extending from the river electromagnetic flow rate sensor 40 into the gap 26 between the base frame 20A and the base metal plate 20B in addition to the mounting hole 24A. Is formed. As shown in FIGS. 3 and 5, the cable 42 is led out of the base board 20 from the upper end opening 26 </ b> A through the gaps 26 of the base board constituting bodies 21 arranged in tandem. By passing the cable 42 through the gap 26 formed on the inner side of the base board 20, disconnection and catching of the flowed-down object are prevented. The cable 42 is routed along the rear surface of the base sheet metal structure 21B by a wiring fixture (not shown) attached to the rear surface of the base sheet metal structure 21B.

  Here, only one river electromagnetic flow rate sensor 40 is attached to the base panel structure 21 of the present embodiment at the center in the vertical direction of the base sheet metal structure 21B. That is, the river flow velocity measuring device 90 has a configuration in which a plurality of river electromagnetic flow velocity sensors 40 are attached at intervals of 1 m above and below the base board 20 (see FIG. 2).

  In addition, a total of two river electromagnetic flow velocity sensors 40 may be attached one by one at a position 0.25 m away from the central portion of the base sheet metal structure 21B to both ends. That is, the river flow velocity measuring device 90 may have a configuration in which a plurality of river electromagnetic flow velocity sensors 40 are attached at intervals of 0.5 m above and below the base board 20.

  The river electromagnetic flow velocity sensor 40 is as follows. As shown in FIG. 5, the river electromagnetic flow velocity sensor 40 includes a main body housing 41 that holds a pair of detection electrodes 43 and 43, and a mount-type housing 50 that covers the main body housing 41.

  As shown in FIG. 9A, the main body housing 41 accommodates electric parts such as a pair of detection electrodes 43, an excitation coil 44, and a measurement circuit unit 45 in a flat body 48 made of resin, and resin around them. (For example, urethane resin) is molded, and these electrical components are electrically connected to a cable 42 extending from the upper surface of the main body housing 41.

  More specifically, the exciting coil 44 is disposed at the core of the main body housing 41 and generates a magnetic field from the front end face 46A of the flat cylindrical sensor head 46 into the water flow. From the front end face 46A of the sensor head 46, the front ends of the pair of detection electrodes 43, 43 are slightly exposed so that they can come into contact with water flowing through the river 11. These detection electrodes 43 and 43 are connected to the measurement circuit unit 45, and are arranged side by side so as to be substantially orthogonal to the flow direction of the water flow (see FIG. 6). The detection electrodes 43 and 43 detect an electromotive force (potential difference) generated when river water passes through the magnetic field generated by the excitation coil 44, and the measurement circuit unit 45 calculates the flow velocity based on the detection signal. To do. Here, as shown in FIG. 9C, the front end surface 46A of the sensor head 46 has a flat dome shape that bulges outward and narrows toward the center.

  As shown in FIG. 9B, attachment holes 47 for attachment to the base board 20 are formed at the four corners of the main body housing 41. Bolts (not shown) are inserted into the mounting holes 47 and the mounting holes 24A formed in the sensor mounting portions 24 of the base board 20, and nuts (not shown) are attached to the bolts on the rear surface side of the base sheet metal structure 21B. The main body housing 41 is fixed to the base board 20 by screwing together. A metallic conductive plate 49 is assigned to the rear surface of the main body housing 41, and the conductive plate 49 is in conduction with the base sheet metal 20B. The conduction plate 49 is connected to the GND portion of the measurement circuit unit 45, and the conduction plate 49 serves as a grounding portion of the river electromagnetic flow velocity sensor 40.

  On the other hand, the mount-type housing 50 has a structure in which the central portion is raised in a trapezoidal shape corresponding to the convex shape of the main body housing 41 as shown in FIG. It is formed by bending with a plurality of extended folding lines. Specifically, the mount-type housing 50 is connected to the top component wall 51 parallel to the flow direction of the water flow, and is connected to both sides of the top component wall 51 via the bent portions 56 and 56 toward the base board 20. A pair of inclined side walls 52, 52, and a pair of attachments that are connected to the ends of both inclined side walls 52, 52 via bent portions 57, 57 and are directed to the front surface of the base board 20 and fixed. And 53 and 53. A portion between the mounting pieces 53 and 53 is a mount portion 59 raised from the base board 20. In addition, since each bending part 56 and 57 is roundish, the flow of water is not disturbed in the bending parts 56 and 57.

  A circular detection through hole 55 passes through the central portion of the top constituting wall 51, and a sensor head 46 protruding from the main body housing 41 is fitted therein. As a result, the pair of detection electrodes 43, 43 exposed on the tip surface 46A of the sensor head 46 are exposed to the outside of the mount-type housing 50, and can come into contact with river water.

  Of the pair of inclined side walls 52, 52, the upstream inclined side wall 52 is inclined upward so as to gradually move away from the base board 20 from upstream to downstream, and the downstream inclined side wall 52 extends from the upstream. The slope is descending so as to gradually approach the base board 20 as it goes downstream.

  Each mounting piece 53, 53 is formed with a pair of mounting holes 54, 54 arranged vertically. Bolts 25B are inserted into these mounting holes 54 and mounting holes 24A formed in each sensor mounting portion 24 of the base board 20, and nuts 25N are screwed onto the bolts 25B on the rear surface side of the base sheet metal structure 21B. A mount-type housing 50 is fixed to the base board 20.

  The above is the description of the configuration of the river electromagnetic flow velocity sensor 40 and the river flow velocity measuring device 90 provided with the river electromagnetic flow velocity sensor 40. The river flow velocity measuring device 90 is a river flow velocity described below. It is incorporated in the measurement system 100.

  As shown in FIG. 1, a data logger 60 that houses various devices constituting the river flow velocity measurement system 100 is installed on the pier 10. For example, one data logger 60 is provided for each river flow velocity measuring device 90 and is connected to a plurality of river electromagnetic flow velocity sensors 40 attached to the base board 20 by the cable 42.

  As shown in FIG. 10, the data logger 60 includes a transmission device 61, a data collection device 62, a storage device 63, a power supply 64, and the like. The data collection device 62 accesses the measurement circuit units 45 of all the river electromagnetic flow velocity sensors 40 and reads out the flow velocity information and the identification information. The storage device 63 temporarily stores information read by the data collection device 62.

  The transmission device 61 transmits the flow rate information, identification information, and the like stored in the storage device 63 wirelessly to a management center computer that performs data analysis using a wireless communication network such as a PHS or a mobile phone network. Transmission or wired transmission using an optical cable. The power source 64 may be, for example, a commercial power source or a built-in battery supplied from an electric power company, but is any one of solar power generation, hydroelectric power generation, wind power generation obtained in a place where the river flow velocity measuring device 90 is installed, or a combination thereof. A power source is preferred. Further, since the river electromagnetic flow velocity sensor 40 is disposed in water, wireless transmission is difficult. Therefore, the information acquired by the river electromagnetic flow velocity sensor 40 using the cable 42 that is passed through the inside of the base board 20 and mechanically protected as described above is collected in the data logger 60. The above is the description of the river flow velocity measuring system 100.

  Next, the effect of this embodiment is demonstrated. When the river flow velocity measuring system 100 is activated, the excitation coil 44 provided in the river electromagnetic flow velocity sensor 40 is excited, and a magnetic field that intersects the flow direction of the water flow is generated in the vicinity of the river electromagnetic flow velocity sensor 40. When river water passes through this magnetic field, an electromotive force is generated according to the flow velocity, and a potential difference between the detection electrodes 43 and 43 is taken into the measurement circuit unit 45 as a detection signal. The measurement circuit unit 45 calculates the flow velocity.

  Flow velocity information measured by each river electromagnetic flow velocity sensor 40 is read by the data collection device 62 as a set with identification information for distinguishing the river electromagnetic flow velocity sensor 40 and temporarily stored in the storage device 63. The flow rate information and the identification information stored in the storage device 63 are wirelessly transmitted to the computer of the management center by the transmission device 61 at predetermined time intervals or in real time, and data analysis is performed at the management center. Specifically, for example, the flow velocity distribution, the flow velocity change, the average flow velocity, and the flow rate of the river 11 in the water depth direction and the river width direction are observed. Here, the flow rate of the river 11 can be obtained by multiplying the cross-sectional area of the river 11 measured by a known method and the average flow velocity. Further, since it is possible to determine whether or not the river electromagnetic flow rate sensor 40 is in water based on the flow velocity information of the river electromagnetic flow rate sensor 40, among the plurality of river electromagnetic flow rate sensors 40 attached to the base board 20, It is possible to roughly know the water level of the river 11 from the mounting position of the uppermost river electromagnetic flow velocity sensor 40 determined to be in water. In the configuration of the present embodiment, since the river electromagnetic flow velocity sensor 40 is attached at intervals of 1 m, it is possible to measure the water level in units of 1 m.

  By the way, it is not unusual for garbage to flow through the river 11. In particular, during a heavy rain or flood, a large amount of trees, earth and sand, etc. flow from the river basin, so that there is a high possibility that these falling objects will collide with the electromagnetic flow velocity sensor 40 for the river. Further, since the flow velocity increases during a flood, there is a possibility that the flowed-down material will collide with the river electromagnetic flow velocity sensor 40 more strongly than usual.

  On the other hand, the river electromagnetic flow velocity sensor 40 of the present embodiment includes the mount-type housing 50 that is inclined toward both ends in the direction of flow of the water flow, and the base panel as the inclined side wall 52 on the upstream side moves from upstream to downstream. An upward slope is formed so that the distance from 20 gradually increases. Thereby, the impact when the flowing-down thing flowing from the upstream of the river 11 collides with the electromagnetic flow velocity sensor 40 for rivers is relieved, and durability (reliability) improves. Further, since the upstream inclined side wall 52 is inclined with respect to the flow direction of the water flow, it is possible to prevent the flowing-down matter from being caught by the river electromagnetic flow velocity sensor 40. Further, the resistance of the water flow is suppressed, and the water flow smoothly flows along the surface of the mount-type housing 50, so that the flow velocity can be measured stably.

  Further, a main body housing 41 including electrical parts such as the detection electrodes 43 and 43, the exciting coil 44, and the measurement circuit unit 45, which are the main parts of the river electromagnetic flow velocity sensor 40, is accommodated inside the metal mount housing 50. Therefore, it is possible to prevent the occurrence of malfunctions of those electrical components due to the collision of the falling material. Moreover, since the mount-type housing 50 is opened up and down, mud and sand are difficult to accumulate inside the mount-type housing 50.

  Further, according to the river flow velocity measuring device 90 of the present embodiment, the cable 42 extending from the river electromagnetic flow velocity sensor 40 is passed through the gap 26 inside the base panel 20, so that disconnection and catching of a fallen object are prevented. Can be prevented. Since the base board 20 is fixed to the pier 10, it can be prevented from being swept away or tilted by water pressure. Moreover, since the base board 20 is detachable with respect to the pier 10, the several electromagnetic flow velocity sensors 40 for rivers can be installed in the water flow of the river 11 at once, or can be removed, and work effort is reduced. Furthermore, since the river electromagnetic flow rate sensor 40 can be attached to and detached from the base board 20, if any of the river electromagnetic flow rate sensors 40 malfunctions, only the river electromagnetic flow rate sensor 40 is removed from the base board 20. Can be removed and replaced. Even if any of the river electromagnetic flow velocity sensors 40 is removed, the flow velocity can be continuously measured by another normal river electromagnetic flow velocity sensor 40.

  Moreover, according to the river flow velocity measuring system 100 of the present embodiment, the flow velocity distribution, the average flow velocity, and the like of the river 11 can be observed in two directions, the water depth direction and the river width direction. Thereby, the flow velocity and flow rate of the river 11 can be measured more accurately. Furthermore, since the flow velocity information measured by the river electromagnetic flow velocity sensor 40 is transmitted to the management center by the transmission device 61, it is not necessary for an attendant to actually go to the river 11 to perform measurement work, and the river can be safely and low-cost. 11 states can be observed.

[Second Embodiment]
In the second embodiment, among the electromagnetic flow velocity sensors for rivers, the configuration of the mount type housing is different from that of the first embodiment. The mount-type housing 150 of the present embodiment is formed, for example, by drawing a stainless steel sheet metal, and as shown in FIG. 11C, the dome portion 151 bulged corresponding to the convex shape of the main body housing 41. And a flange portion 152 (corresponding to the “mounting piece” of the present invention) projecting laterally from the edge portion of the dome portion 151. The outer surface of the dome portion 151 is formed of a smooth curved surface (specifically, a part of a spherical surface), and is inclined so as to fall gently from the apex portion toward the flange portion 152. The sensor head 46 is fitted in the detection through hole 55 penetrating the apex portion of the dome portion 151, and the detection electrodes 43, 43 are exposed to the outside from here. Further, as shown in FIG. 11A, the front end surface 46A of the sensor head 46 and the outer surface of the dome portion 151 are substantially flush with each other. A plurality of (for example, four) mounting holes 54 are equally arranged in the circumferential direction in the flange portion 152.

  As shown in FIG. 11C, the main body housing 41 is fixed to a back plate 153 having a disk shape by screwing or welding. The main body housing 41 is accommodated in a dome-shaped space 154 formed between the dome portion 151 and the back plate 153 with the flange 152 of the mount housing 150 being directed to the peripheral edge of the back plate 153. The cable 42 of the main body housing 41 is led out from a cable lead-out hole 155 that penetrates the dome portion 151.

  The river electromagnetic flow rate sensor 140 is fixed to the pier wall surface 10A directly by anchor bolts or via the base board 20 in the same manner as in the first embodiment. Other configurations are the same as those in the first embodiment.

  The configuration of this embodiment also has the same effect as the first embodiment. Further, according to the configuration of the present embodiment, mud and sand can be prevented from entering the inside of the mount-type housing 150. Here, the outer surface shape of the dome portion 151 may be an elliptical spherical shape that is elongated in the flow direction of the water flow as shown in FIG. 12 (A), or the ridgeline and the corner portion as shown in FIG. 12 (B). A rounded truncated pyramid trapezoidal surface may be used.

[Third Embodiment]
FIG. 13 shows a river electromagnetic flow velocity sensor 240 according to a third embodiment of the present invention. This river electromagnetic flow rate sensor 240 includes a metal back plate 130, and is different from the first embodiment in that it is directly fixed to the pier wall surface 10A without the base board 20.

  The back plate 130 has, for example, a horizontally long rectangular shape corresponding to the shape of the mount housing 50, and the main body housing 41 is fixed to the back plate 130 by screwing or welding. On both sides of the back plate 130, mounting holes 131 for fixing the back plate 130 and the mount-type housing 50 together and fixing the back plate 130 to the pier wall surface 10 </ b> A are formed. The mounting pieces 53 and 53 of the mount-type housing 50 are directed to both sides of the back plate 130, and the anchor bolts erected from the pier wall surface 10A in the mounting holes 54 and 131 formed in the mounting pieces 53 and 53 and the back plate 130. By tightening the nut through, the river electromagnetic flow velocity sensor 240 is directly fixed to the pier wall surface 10A. In addition, if the metal plate 132 is laid on the rear surface of both side portions of the back plate 130, the river electromagnetic flow velocity sensor 240 can be firmly fixed. Further, the cable 42 may be passed through a gap formed between the back plate 130 and the pier wall surface 10A by laying the metal plate 132. Even in the configuration of the present embodiment, the durability of the river electromagnetic flow rate sensor 240 is improved.

[Fourth Embodiment]
14 and 15 show a fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in the configuration of the base board structure 21 (base board 20). That is, the base board structure 21 in this embodiment includes a plurality of fixing pieces 222 instead of the horizontal frame member 122 in the first embodiment. A plurality of these fixing pieces 222 are provided at equal intervals on both side edges of the base sheet metal structure 21B, and project laterally. Each fixing piece 222 is pivotally supported with respect to the base sheet metal structure 21B by a hinge pin 221 (see FIG. 15) extending in the vertical direction (longitudinal direction of the base sheet metal structure 21B). In the center portion, for example, a fixing hole 22A for penetrating an anchor bolt standing from the pier wall surface 10A and fixing the base sheet metal structure 21B to the pier wall surface 10A is formed through.

  According to this river flow velocity measuring device 90, since the fixed piece 222 swings with respect to the base sheet metal structure 21B, not only when the pier wall surface 10A is a flat surface, but also as shown in FIG. Even if is a curved surface, the base board 20 can be fixed in a state where the fixing piece 222 is directed to the pier wall surface 10A. Thereby, the freedom degree of the fixed place of the base board 20 improves. Further, as shown in FIG. 15, even when the pier wall surface 10A is a curved surface, the gap between both side edges of the base sheet metal structure 21B and the pier wall surface 10A can be kept small.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) The shape of the mount-type housing 50 is not limited to the one constituted by a continuous flat wall as in the first embodiment, and the mount portion 59 can be seen when viewed from above and below as shown in FIG. You may make it make a substantially circular arc wall shape.

  (2) In the first to third embodiments, the main body housing 41 is accommodated inside the mount type housings 50 and 150. However, the excitation coil 44, the detection electrode 43, and the like are provided inside the mount type housing 50. 43, electrical components such as the measurement circuit unit 45 may be accommodated and the periphery of the electrical components 43, 44, 45 may be molded with resin. That is, a configuration in which the electrical components 43, 44, 45 are integrally incorporated in the mount type housing 50 may be employed.

  (3) In the first to third embodiments, the mount-type housings 50 and 150 are made of metal. However, the mount-type housings 50 and 150 may be made of a resin having excellent strength (specifically, FRP (fiber reinforced plastic)). Good.

  (4) The base board 20 is fixed to the pier 10 with anchor bolts, but may be tied to the pier 10 with a wire, a rope, or the like.

  (5) Although the mount-type housing 50 is detachably fixed to the base board 20, one side (for example, the upstream side) in the flow direction is attached to the base board 20 so as to be rotatable with respect to the hinge. In addition, a configuration that can be opened and closed like a so-called door may be employed. At this time, the other side portion of the mount-type housing 50 and the base board 20 may be provided with engagement portions that engage with each other when the mount-type housing 50 is closed.

  (6) The electromagnetic flow velocity sensors 40, 140, and 240 for rivers are attached to the pier 10, but may be attached to H steel standing in the water flow, a rock portion on the riverbank, a revetment wall, or the like.

Conceptual diagram of river flow velocity measurement system according to the first embodiment Front view of river flow velocity measuring device Cross-sectional view of river flow velocity measuring device Perspective view of river velocity measuring device Plan view of river velocity measuring device Front view of base board structure and river electromagnetic flow velocity sensor Front view of base frame structure Mounted housing perspective view (A) Side sectional view of main housing, (B) Front view, (C) Side view Conceptual diagram of data logger (A) top view, (B) front view, (C) plane sectional view of an electromagnetic flow velocity sensor for rivers according to a second embodiment Front view of river electromagnetic flow velocity sensor The perspective view of the electromagnetic flow velocity sensor for rivers concerning 3rd Embodiment Front view of river flow velocity measuring apparatus according to the fourth embodiment Plan view of river velocity measuring device Plan sectional view of an electromagnetic flow velocity sensor for rivers according to another embodiment (1)

Explanation of symbols

10 Pier (support)
10A Wall surface of the pier (support wall surface)
11 River 20 Base panel 21 Base panel structure 20A Base frame 20B Base sheet metal 22A Fixing hole 25B Bolt (spiral part)
25N nut (spiral part)
26 Gap 26A Upper end opening 27 Cable introduction hole 40,140,240 River electromagnetic flow velocity sensor 41 Main body housing 42 Cable 43 Detection electrode 44 Excitation coil (electrical part)
45 Measurement circuit (electric parts)
46 Sensor head (fitting protrusion)
50, 150 Mount type housing 51 Top construction wall 52 Inclined side wall 53 Mounting piece 54 Mounting hole 55 Detection through-hole 61 Transmitter 62 Data collector (information collector)
90 River Flow Velocity Measurement Device 100 River Flow Velocity Measurement System 130 Back Plate 131 Mounting Hole 151 Dome 152 Flange (Mounting Piece)
221 Hinge pin 222 fixed piece

Claims (12)

A river electromagnetic anemometer fixed to a support wall surface substantially parallel to the flow direction of the water flow among the supports provided in the water flow of the river, and capable of measuring the flow velocity of the water flow,
A mount-type housing attached to the support wall surface and inclined toward both end sides in the water flow direction; and a pair of detection electrodes arranged vertically on the top portion of the mount-type housing;
An electromagnetic flow velocity sensor for a river, wherein the flow velocity of the river is measured based on a potential difference detected by the pair of detection electrodes. The mount-type housing is formed by processing sheet metal or resin,
A main body housing that holds an electrical component that is housed in the mount housing and includes the pair of sensing electrodes;
A through hole for detection is formed in the top portion of the mount-type housing, and a fitting protrusion is formed in the main body housing to be fitted into the detection through hole, and the pair of detections is formed in the fitting protrusion. The electromagnetic flow velocity sensor for rivers according to claim 1, wherein the electrodes are arranged in an exposed state. The mount-type housing is formed by bending the sheet metal with a plurality of folding lines extending vertically, and is connected to a top constituting wall parallel to the flow direction of the water flow, and to both sides of the top constituting wall via a bent portion. A pair of inclined side walls, and a pair of attachment pieces connected to the ends of both of the inclined side walls via a bent portion,
The river electromagnetic flow velocity sensor according to claim 2, wherein an attachment hole for fixing the attachment pieces to the support wall surface is formed in each of the attachment pieces.   The mount-type housing includes a dome portion formed by drawing the sheet metal and an attachment piece projecting laterally from an edge of the dome portion, and the attachment piece is fixed to the support wall surface. A river electromagnetic flow velocity sensor according to claim 2, wherein a mounting hole is formed. An electromagnetic flow velocity sensor for rivers according to any one of claims 1 to 4,
A base board fixed to the support wall surface,
A river flow velocity measuring device, wherein a plurality of the river electromagnetic flow velocity sensors are attached to the base panel in a vertical direction. The base board is formed by holding a base frame extending vertically and a base sheet metal in a state where a gap is left therebetween, and a screw part for detachably attaching the mount housing to the base sheet metal, A cable introduction hole for introducing a cable extending from each of the river electromagnetic flow rate sensors into the gap between the base frame and the base sheet metal is formed,
The river flow velocity measuring device according to claim 5, wherein the cable is led out from an upper end opening of a gap between the base frame and the base sheet metal.   The river flow velocity measuring device according to claim 5 or 6, wherein the base board is detachable from a bridge pier as the support.   The river flow velocity measuring device according to any one of claims 5 to 7, wherein the plurality of river electromagnetic flow velocity sensors are detachably fixed to the base board.   The river flow velocity measuring device according to any one of claims 5 to 8, wherein the base board can be divided into a plurality of base board components in the vertical direction.   A fixing piece that is swingably connected to both side edges of the base board by hinge pins extending in the vertical direction of the base board, and for fixing the base board to the support wall surface on the fixing piece. The river flow velocity measuring device according to any one of claims 5 to 9, wherein a hole is formed. A river flow velocity measuring device according to any one of claims 5 to 10,
An information collecting device for collecting flow velocity information measured by the plurality of river electromagnetic flow velocity sensors provided in the river flow velocity measuring device;
A river flow velocity measurement system comprising: a transmitter that transmits the collected flow velocity information to the outside together with identification information for identifying the river electromagnetic flow velocity sensor. A plurality of the supports are erected in the river width direction of the river,
The river flow velocity measuring system according to claim 11, wherein the river flow velocity measuring device is attached to each of the plurality of supports.

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