JP2018178504A - Sink-and-float type fence and sink-and-float type fence system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sink-and-float type fence which is compact with a weight body and a bag body which floats the lower end of a water-blocking fence and is hard to be resisted by water.SOLUTION: The present invention comprises a float 18 (A, B) floating on the water surface, a water-blocking fence 17 depending from the float 18 (A, B), a weight body 4 for sinking the lower end of the water-blocking fence 17, and a bag body 5 formed so as to be able to supply and discharge air so that the lower end of the water-blocking fence 17 can be floated by the buoyancy of the air. The bag body 5 includes a first bag body 51 supported at the lower end of the water-blocking fence and a second bag body 52 housed in the first bag body 51 and formed so as to be able to supply and discharge air. The weight body 4 is accommodated in the second bag body 52.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a floating fence and a floating fence system.

  Conventionally, in rivers, dam lakes, and the like, a floating fence may be disposed for the purpose of suppressing the downstream outflow of floating debris. As such a floating and sinking fence, a floating and sinking fence as disclosed in, for example, Patent Document 1 is known. The floating and sinking fence disclosed in Patent Document 1 includes an upper fence, a lower fence, and a bag (float) whose buoyancy can be adjusted by air at the lower ends of the upper fence and the lower fence. A bag is provided outside with a weight separately disposed approximately parallel to the bag, and air is supplied to one or both of the bag disposed on the upper fence and the bag disposed on the lower fence. , And one or both of the upper and lower fences can be floated. As a result, for example, when the water discharge period or turbid water flows, it is possible to float the lower part of the fence and carry out water flow as needed.

Patent No. 3632000

  However, in the floating and sinking type fence as in Patent Document 1, since a weight is disposed separately from the bag on the outer side of the bag, the bag and the weight become bulky, and the bag and the weight are separated. Each one of the body becomes resistance of water. Therefore, in the normal state in which the weight and the bag disposed at the lower end of the fence are submerged in water, it is difficult for the water to flow smoothly. In addition, it is also conceivable that the resistance of the water may hinder smooth raising and lowering of the lower end of the fence. Furthermore, when raising or lowering the lower end of the fence, it is also conceivable that the fence may be damaged by a weight or a foreign object caught by the cone.

  The present invention has been made to solve the above problems, and aims to provide a floating and sinking fence in which the weight and the bag body for floating the lower end of the water blocking fence are compact and are not susceptible to water resistance. . More preferably, it is an object of the present invention to provide a floating and sinking fence which is less likely to be damaged by a weight and foreign matter caught on the fence when raising and lowering the fence.

  In order to solve the above problems, according to the present invention, the float floating on the water surface, a water blocking fence hanging down from the float into water, a weight for sinking the lower end of the water blocking fence, and the buoyancy of air. And a bag body formed to be capable of supplying and discharging air so that the lower end of the water blocking fence can float, and one of the weight and the bag is accommodated in the other To provide a floating fence characterized in that

  According to this configuration, it is possible to raise (lift) the lower end of the water blocking fence by supplying air to the bag body to generate buoyancy larger than the weight of the weight. In addition, since one of the weight and the bag is accommodated in the other, it can be made compact and the resistance of water can be reduced. Therefore, in the normal state in which the weight and the bag placed at the lower end of the water blocking fence are submerged in water, the water can flow smoothly. In addition, also when raising and lowering the lower end of the water blocking fence, the resistance of water can be reduced to perform smoothly.

  In the above-described floating and sinking fence, the bag body may include a weight receiving portion for receiving the weight, and the weight may be received in the weight receiving portion.

  For example, when the weight is disposed separately from the bag on the outside of the bag and the weight is exposed, the foreign matter is easily caught by the weight. In particular, when a chain is used as a weight body, foreign matter is easily caught, and the foreign matter may be rubbed against the fence when raising and lowering the lower end of the fence, and the fence may be damaged. In addition, even when no foreign object is caught on the weight, the weight itself may be rubbed against the fence when raising or lowering the lower end of the fence, and the fence may be damaged.

  However, according to the above configuration in which the weight is housed in the bag body, even when using a chain as the weight, for example, no foreign matter is caught on the weight, and the lower end of the water blocking fence is raised. Foreign matter is prevented from rubbing against the water blocking fence to damage the water blocking fence. Further, since the weight does not directly rub against the water blocking fence, the water blocking fence can be protected from being damaged by the chain even when, for example, a chain is used as the weight. That is, according to the above configuration, a rational configuration is achieved in which the bag body supplied with the air to lift and lower the lower end of the fence is also used to cover the weight in order to prevent catching of the foreign matter.

  Further, in the above-described floating and sinking fence, the bag body includes a first bag body supported by the lower end of the water shielding fence, and a second bag body accommodated in the first bag body, The second bag body may be configured to be capable of supplying and discharging air, and the weight accommodation portion may be formed in the second bag body.

  According to this configuration, since the second bag body containing the weight is contained in the first bag body, the second bag body is prevented from being damaged by rubbing against the water blocking fence. Therefore, even in long-term use, it is possible to prevent the bag from being torn, causing problems in raising and lowering the lower end of the fence and exposing the weight.

  The weight body has a tubular shape having a bag housing portion in the inside, and includes a cylindrical body having a plurality of through holes communicating with the inside and the outside formed in the circumferential surface, and the bag is housed in the bag body It can be set as the structure accommodated in the part.

  According to this configuration, the lower end of the water blocking fence can be raised by supplying air to the bag housed in the bag housing portion of the weight to generate a buoyancy greater than the weight of the weight. it can. In addition, since the bag body is housed inside the cylindrical body, it can be made compact, water can flow smoothly, and the lower end of the water blocking fence can be smoothly raised and lowered.

  In the above-mentioned floating and sinking fence, it is preferable that the cylindrical body has a circular or elliptical cross-sectional outer peripheral shape.

  According to this configuration, it is possible to reduce the resistance of water when raising and lowering the lower end of the water blocking fence, and, even when raising the lower end of the water blocking fence, the weight is directly rubbed by the water blocking fence. Contact resistance is small, and the water blocking fence is less likely to be damaged.

  On the other hand, in the floating and sinking fence system of the present invention, the floating and sinking fence described above, a detecting unit for detecting an external force acting on the water blocking fence by water flow or a physical quantity proportional to the external force, and detection values by the detecting unit are set. When it becomes more than a value, it has a control part which controls supply of the air to the said bag body, in order to float the lower end of the said fence for water blocking.

  According to this floating and sinking fence system, it is possible to automatically raise the lower end portion of the water blocking fence to promote water flow when there is a situation where the external force acting on the water blocking fence becomes large, such as when the water is rising. It becomes. Therefore, it is possible to protect the water blocking fence from damage due to water increase and the like.

  As described above, according to the floating and sinking fence of the present invention, it is possible to provide a floating and sinking fence in which the weight and the bag body for floating the lower end of the water blocking fence are compact and hard to receive water resistance. .

It is a top view of the floating and sinking fence of the first embodiment of the present invention installed in a dam lake. It is a front view of the floating and sinking fence of FIG. 1 seen from the upstream side. BRIEF DESCRIPTION OF THE DRAWINGS It is a circuit diagram which shows the whole structure of an ups and downs type fence system. FIG. 2 is a schematic cross-sectional view of the floating and sinking fence of FIG. 1; It is a schematic sectional drawing of the state in which air was supplied to the bag provided in the floating and sinking type | mold fence of FIG. 1, and the lower end of the water blocking fence floated up. It is a front view of the floating and sinking fence of 2nd Embodiment. FIG. 7 is a schematic cross-sectional view of the floating and sinking fence of FIG. 6; It is a schematic sectional drawing of a state in which air was supplied to the bag provided in the floating and sinking fence of FIG. 6, and the lower end of the water blocking fence floated up.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of the floating and sinking fence according to the first embodiment of the present invention installed in the dam lake, FIG. 2 is a front view of the floating and sinking fence viewed from the upstream side, and FIG. It is a circuit diagram showing the whole composition of a fence system.

  The floating and sinking fence 1 of the first embodiment includes a float 18 (A, B) that floats on the water surface of the dam lake 10, a water blocking fence 17, and a weight 4 for sinking the lower end of the water blocking fence 17. , And a bag 5 for raising the lower end of the water blocking fence 17. And, the floating and sinking type fence system is constituted by the floating and sinking type fence 1 and the supply and discharge device 60 for supplying and discharging the air to the bag body 5. In FIG. 2, the float 18 (A) is indicated by a line for the sake of convenience.

  Both ends of the floats 18 (A, B) are connected to the wires of anchor blocks 16 and 16 respectively installed on the left bank and the right bank (the directions for looking at the downstream side from the upstream side for the left and right. It is done. The total length of the floating and sinking fence 1 of this embodiment is, for example, about 302 m, and the maximum deflection D is, for example, about 65 m. The total length L1 of the float 18 (A, B) is also substantially equal to the total length of the floating and sinking fence 1.

  The floats 18 (A, B) are composed of a fixed float 18 (A) always floating on the water surface of the dam lake 10, and a float 18 (B) floated up and down by air supply and discharge.

  The fixed floats 18 (A) are disposed on the right bank side and the left bank side, respectively, and float between the fixed float 18 (A) on the right bank side and the fixed float 18 (A) on the left bank side. ) Are arranged.

  The float 18 (B-1) is a passing / shipping float 18 (B-1) having a width L5 (eg, about 6 m) through which a small boat for management can pass and a length H2 (eg, about 2 m) that can sink. And a float / sink float 18 (B-1) for securing a desired water flow together with the float / sink float 18 (B-1). In this embodiment, the total length (L2 + L3) of these floats 18 (B-1) and (B-2) is about 40 m.

  The floating / sink floats 18 (B-1) for passing water and ships are provided with a length L2 from the substantially central portion of the floating / sinking fence 1 to the left bank, and the floating-only floats 18 (B-2) are the central portions To the right bank side with a length L3.

  The water passing float type floating float 18 (B-1) is formed of a synthetic rubber, and expands in a cylindrical shape (for example, about 400 mm in outer diameter) when air is supplied.

  In addition, auxiliary floats (not shown) are connected to both ends of the upper part of the floating / sink floats 18 (B-1) for passing water and ships, respectively, and the floating floats for passing and passing ships by this auxiliary float. By floating on the water surface when the float 18 (B-1) sinks, the sink position of the water passing floating float sink 18 (B-1) is regulated.

  In addition, a ship display buoy (not shown) is connected by means of a chain or the like to both sides of the upper part of the floating / sink float 18 (B-1) for passing / shipping vessels, and the pair of left and right When the ship display buoy floats on the water surface when the floating / sink float 18 (B-1) sinks (refer to the alternate long and short dash line), the shipable width (for example, about 6 m) L5 is displayed. There is.

  The water-specification float / sink float 18 (B-2) is made of synthetic rubber, similar to the water-passing / shipping float / sink float 18 (B-1), and has a cylindrical shape (for example, an outer diameter when air is supplied) Has expanded to about 400 mm).

  In this embodiment, auxiliary floats (not shown) are respectively connected by means of a chain or the like at appropriate positions (four places in this example) on the upper part of the water-passing float / sink float 18 (B-2). The float floats on the water surface at the time of settlement of the flow-specific float / sink float 18 (B-2), thereby regulating the settlement position of the flow-specific float / sink float 18 (B-2).

  The right end of the float / float for floating / sink float 18 (B-1) and the left end of the float for float only 18 (B-2) are connected so as to be in air communication via a communication valve 28 and a connection fitting described later. It is done. On the other hand, the left end portion of the floating / sink float float 18 (B-1) and the right end portion of the fixed float 18 (A) on the left bank side are connected only by the connection fitting. The right end of B-2) and the left end of the fixed float 18 (A) on the right bank side are connected only by the connection fitting. That is, the floats 18 (B-1) and (B-2) and the fixed float 18 (A) are simply connected in a state where air communication is not possible.

  The upper end of the water blocking fence 17 is connected to the float 18 (A, B), and the lower end of the water blocking fence 17 is suspended from the float 18 (A, B) in water by the weight of a weight 4 described later. In this embodiment, the water blocking fence 17 is formed of a synthetic resin sheet, and the length thereof is substantially the same as the float 18 (A, B), and the height H of the water blocking fence 17 Is about 15 m, for example. In addition, depending on the place and the use, the water blocking fence 17 has a water cut-off fence and a water permeable fence having a certain degree of water permeability. In this embodiment, water-quenched ones are used.

  The bag body 5 includes a first bag body 51 supported by the lower end of the water blocking fence 17 and a second bag body 52 accommodated in the first bag body 51.

  As shown in FIG. 4, the first bag body 51 is formed of a cylindrical body having a second bag body accommodating portion 51 a for accommodating the second bag body 52 inside. In this embodiment, the first bag body 51 is provided by folding the lower end of the sheet forming the water blocking fence 17 and forming it into a tubular shape. Therefore, as shown in FIG. 2, the first bag has substantially the same length as the entire length of the water blocking fence 17 and is disposed over the entire area of the lower end of the water blocking fence 17. Even if the first bag body 51 is a separate body from the water blocking fence 17, a cylindrical body formed of a synthetic resin sheet or the like is connected to the lower end of the water blocking fence 17. Good.

  In the present embodiment, as shown in FIG. 4, the second bag 52 is made of a synthetic rubber cylindrical body having a weight accommodating portion 52 a for containing the weight 4 therein. Further, the second bag body 52 is formed so that air can be supplied to and drained from the weight accommodating portion 52 a so that the lower end of the water shielding fence 17 can be floated by the buoyancy of the air.

  The second bag 52 has substantially the same length as the first bag 51, and the entire second bag 52 is accommodated in the second bag receiving portion 51 a of the first bag 51.

  In this embodiment, the weight 4 is formed of a chain in which a plurality of chain elements are sequentially connected, and has a length substantially the same as the length of the water blocking fence 17. The weight 4 is housed in the weight housing portion 52 a of the second bag 52, and the whole is covered by the second bag 52. The weight 4 is fixed to the second bag 52 at a plurality of locations including both ends in the longitudinal direction. In FIG. 2, only a part of the weight 4 is shown.

  As shown in FIG. 3, the water supply and discharge device 60 communicates with the air supply device (compressor) 6, the air supply hose extending from the air supply device 6, and the floating / sink float 18 (B-1) for passing water and passing ship. The communication valve 28 is connected to the water-only float float 18 (B-2), and the exhaust valve 30 is provided on the water float float float 18 (B-1). In addition, in FIG. 3, the 1st bag body 51 and the weight 4 are abbreviate | omitted.

  The air supply hose includes a float air supply hose 29 extending from the air supply device 6 to the floating / sink float float 18 (B-1), and a bag supply for extending from the air supply device 6 to the second bag body 52. An air hose 54, a communication valve air supply hose 32a extending from the air supplier 6 to the communication valve 28, and an exhaust valve air supply hose 33a extending from the air supplier 6 to the exhaust valve 30 are provided.

  The float air supply hose 29 is provided with a float air supply valve 31, and the bag air supply hose 54 is provided with a bag air supply / discharge valve 71. Further, air drive valves 32 b and 33 b for controlling the opening and closing of the communication valve 28 and the exhaust valve 30 are respectively provided on the communication valve air supply hose 32 a and the exhaust valve air supply hose 33 a. Further, the bag air supply hose 54 is provided with a bag air supply / discharge valve 71 such as a three-way valve.

  In this embodiment, air supply to the second bag body 52 is automatically controlled by the control unit 7 through the bag body supply / discharge valve 71.

  Specifically, the water blocking fence 17 is provided with a detection sensor 72 (corresponding to a detecting unit of the present invention) that detects tension applied to the water blocking fence 17 by the water flow. The control unit 7 is communicably connected to each of the bag body air supply and exhaust valve 71 and the detection sensor 72. Then, when the detection sensor 72 detects that tension higher than the set tension (corresponding to the set value of the present invention) is applied to the water blocking fence 17, the control unit 7 controls the bag body supply / discharge valve 71. Thus, air is sent from the air feeder 6 to the second bag body 52.

  The air supply valve 31 and the air drive valves 32b and 33b can be manually operated by a worker on land or the like, but can also be remotely controlled by an occupant or the like of a small boat for management by remote control or the like.

  Further, the supply / exhaust valve 71 for the bag is not limited to the one automatically controlled by the control unit 7, and may be one that can be manually operated. Further, the detection sensor 72 is not limited to the one that detects the tension applied to the water blocking fence 17, but may be, for example, the flow rate or the flow velocity of the water flow. Any external force acting or a physical quantity proportional to the external force may be detected.

  Next, the operation of the floating and sinking fence 1 of the first embodiment configured as described above will be described. First, the operation of the floating / sink floats 18 (B-1) for passing and passing ships and the floats 18 (B-2) dedicated to passing water will be described.

  Normally, by closing the exhaust valve 30 and opening the communication valve 28, air is supplied from the air feeder 6 to the floating / sink float 18 (B-1) for passing water and passing ship through the air supply hose 29, and the communication is established. Air is also supplied to the flow-through float float (18) (B-2) through the valve 28. As a result, the floating / sink floats 18 (B-1) for passing and passing ships and the floats 18 (B-2) exclusively for passing water are kept floating on the water surface. Therefore, the water on the upstream side flows downstream only through the lower side of the water blocking fence 17.

  At this time, since the weight 4 disposed at the lower end of the water blocking fence 17 is accommodated in the bags 51 and 52, the water resistance is higher than when the weight and the bag are separately disposed. It becomes smaller. Therefore, water can be smoothly flowed from the lower side of the water blocking fence 17 to the downstream side.

  Then, when the exhaust valve 30 and the communication valve 28 are opened as necessary, the air of the float-float for water and watercraft float 18 (B-1) and the float-only float 18 (B-2) are exhausted. The water passing floating float sink 18 (B-1) and the water only floating float 18 (B-2) will sink in water. Thereby, the water on the upstream side is also transmitted through the portion of the upper end of the water blocking fence 17 through the sinking floating / floating float 18 (B-1) and the water-only floating float 18 (B-2). It will flow downstream.

  In addition, in order to allow the small boat for management to pass through in a state in which the floating / sink float 18 (B-1) for water passing / shipping and the float 18 (B-2) for water only float on the water surface, the communication valve 28 Is closed and the exhaust valve 30 is opened, only the air of the floating / sink float 18 (B-1) is exhausted, so the water-only float / sink float 18 (B-2) is kept floating on the water surface, It is possible to sink only the floating / sink floats 18 (B-1) for water passing / shipping to the depth H2 over the width L5. As a result, the small boat can freely pass through the upstream side and the downstream side of the floating / sink float 18 (B-1) for water and shipping.

  Next, the operation of the bag 5 will be described. For example, when it is detected by the detection sensor 72 that a large amount of turbid water flows at a high speed from the upstream side and that the tension above the set tension is applied to the water blocking fence 17, the control unit 7 controls the bag body 71 is controlled to send air from the air feeder 6 to the second bag 52 through the bag air supply / exhaust valve 71. As a result, as shown in FIGS. 4 and 5, when air is accumulated in the second bag 52 containing the weight 4 and the second bag 52 exerts a buoyancy greater than the weight of the weight 4, The two-bag body 52 ascends to the water surface together with the weight 4. As a result, the lower part of the water blocking fence 17 floats up to the water surface, and the water blocking state by the water blocking fence 17 is released. Therefore, the water blocking fence 17 is prevented from being damaged by continuing to receive a large amount of turbid water pressure.

  At this time, since the weight 4 disposed at the lower end of the water blocking fence 17 is accommodated in the bags 51 and 52, when raising the lower end of the water blocking fence 17, the weight and the bag are separately provided. The resistance of water can be reduced as compared with the case of being disposed in the above, and the lower end of the water blocking fence 17 can be smoothly floated up.

  Further, when the weight 4 is exposed to the outside, the foreign matter is easily caught by the weight 4 made of a chain, and the foreign matter is rubbed against the water shielding fence 17 when the lower end of the water shielding fence 17 is lifted. The water blocking fence 17 may be damaged. In addition, even when no foreign matter is caught on the weight 4, the weight 4 itself may be rubbed against the water blocking fence 17 when the water blocking fence 17 is lifted, and the water blocking fence 17 may be damaged.

  However, according to the water blocking fence 17 of the above embodiment, since the weight 4 is accommodated in the bag bodies 51 and 52, there is no risk that foreign matter is caught on the weight 4 composed of a chain, and the water blocking fence 17 The foreign matter does not damage the water blocking fence 17 when raising the lower end of In addition, when raising the lower end of the water blocking fence 17, the weight 4 does not directly rub against the water blocking fence 17, and hence the water blocking fence 17 is not damaged by the weight 4.

  Further, since the second bag 52 containing the weight 4 is further contained in the first bag 51, the second bag 52 does not rub against the water blocking fence 17, and the second bag 52 It is prevented that the water blocking fence 17 is rubbed and damaged. Therefore, even in long-term use, it is possible to prevent the bag from being torn, causing problems in raising and lowering the lower end of the fence and exposing the weight.

  In order to return the water blocking fence 17 to the original state (the state shown in FIG. 1), the operator operates the bag body supply / exhaust valve 71 manually or remotely by remote control etc. The air of the second bag 52 is exhausted from the air supply and exhaust valve 71. Thereby, the weight of the weight 4 sinks the lower part of the water blocking fence 17 in water.

  Also in this case, since the weight 4 disposed at the lower end of the water shielding fence 17 is accommodated in the bag bodies 51 and 52, the water resistance is reduced as in the case of floating the lower end of the water shielding fence 17 The lower end of the water blocking fence 17 can be lowered smoothly. Further, since the weight 4 is accommodated in the bags 51 and 52, there is no risk that foreign matter is caught on the weight 4 made of a chain, and when lowering the lower end of the water shielding fence 17, the foreign material fence 17 will not be damaged. Further, when lowering the lower end of the water blocking fence 17, the weight 4 does not directly rub against the water blocking fence 17, and therefore, the water blocking fence 17 is not damaged by the weight 4.

  In the first embodiment, the bag body 5 is composed of the first bag body 51 and the second bag body 52. However, the bag body 5 is not limited to this one, and may be composed of only the second bag body 52, for example. It may be changed appropriately. However, according to the configuration including the first bag body 51 and the second bag body 52, it is prevented that the second bag body 52 (bag body to which air is supplied) is damaged due to contact with foreign matter such as driftwood. Be done. Therefore, there is an advantage that the durability of the floating and sinking fence 1 can be improved.

  Next, the floating and sinking fence 100 of the second embodiment will be described based on FIGS. 6 to 8. Similar to the first embodiment, the floating and sinking fence 100 of the second embodiment includes the float 18 (A, B), the water blocking fence 17, the weight 104, and the bag 152. . Then, the floating fence system 100 is configured by the floating fence 100 and the supply / discharge device 60 (see FIG. 3). The floats 18 (A, B), the water blocking fence 17 and the water supply and discharge device 60 have the same configuration as that of the first embodiment.

  The weight 104 of the second embodiment is configured of a cylindrical body having a bag housing portion 142 inside. The weight 104 is, for example, a flexible tube made of a synthetic resin (rubber) and having an elliptical cross-sectional outer peripheral shape, has a length substantially the same as the length of the water blocking fence 17, and the lower end of the water blocking fence 17 It has a sinkable weight. In addition, the cross-sectional outer peripheral shape of the weight 104 is not limited to an elliptical shape, and for example, the cross-sectional outer peripheral shape may be circular and can be changed as appropriate.

  A plurality of through holes 141 which penetrate the bag housing portion 142 from the outside are formed on the circumferential surface of the weight body 104. The through holes 141 allow water to enter the bag housing portion 142 and discharge the internal air, and are formed along the longitudinal direction of the weight 104. In FIG. 6, only a part of the through holes 141 is shown.

  The bag 152 is made of a synthetic rubber cylindrical body. The bag 152 is housed in the bag housing portion 142 of the weight 104. The bag 152 is connected to the bag air supply / exhaust valve 71 via a bag air supply hose 54.

  In the floating and sinking fence 100 of the second embodiment configured as described above, normally, air is not supplied to the bag body 152, and the lower end of the water blocking fence 17 is sunk by the weight of the weight 104. It has become.

  In this state, when it is detected by the detection sensor 72 that the tension above the set tension is applied to the water blocking fence 17, the control unit 7 controls the bag air supply / exhaust valve 71 from the air feeder 6. Air is sent to the second bag 52. As a result, as shown in FIGS. 7 and 8, when air is accumulated in the bag body 152 accommodated in the weight body 104 and a buoyancy larger than the weight of the weight body 104 acts on the bag body 152, the weight together with the bag body 152 The body 104 will rise to the surface of the water. As a result, the lower part of the water blocking fence 17 floats up to the water surface, and the water blocking state by the water blocking fence 17 is released. Therefore, the water blocking fence 17 is prevented from being damaged by the pressure of a large amount of turbid water.

  At that time, since the bag body 152 disposed at the lower end of the water blocking fence 17 is accommodated in the weight 104, when raising the lower end of the water blocking fence 17, the weight and the bag are separately disposed. The resistance of water can be reduced as compared with the case of the above, and the lower end of the water blocking fence 17 can be smoothly floated up.

  Moreover, since the cross-sectional outer peripheral shape of the weight body 104 is an elliptical shape, foreign matter is hard to be caught by the weight body 104, and when the lower end of the water blocking fence 17 is raised, the foreign matter is rubbed against the water blocking fence 17 Be done. Further, even when the weight 104 is directly rubbed against the water blocking fence 17 when raising the lower end of the water blocking fence 17, the contact resistance of the weight 104 is small, and the water blocking fence 17 is hard to be damaged. Therefore, the water blocking fence 17 can be protected from damage due to rubbing with the weight 104 or a foreign object caught on the weight 104.

  In order to return the water blocking fence 17 to the original state (the state shown in FIG. 6), the operator manually or operates the bag body supply / exhaust valve 71 remotely by remote control etc. The air of the bag 152 is exhausted from the air supply and exhaust valve 71. Thereby, the weight of the weight 104 sinks the lower portion of the water blocking fence 17 in water.

  Also in this case, since the weight 104 has an elliptical cross-sectional outer peripheral shape, the water resistance can be reduced and the lower end of the water blocking fence 17 can be made smooth similarly to the case of floating the lower end of the water blocking fence 17 It can be lowered. In addition, when lowering the lower end of the water blocking fence 17, even when the weight 104 is directly rubbed by the water blocking fence 17, the contact resistance of the weight 104 is small, and the water blocking fence 17 is difficult to damage. Therefore, the water blocking fence 17 can be protected from damage due to rubbing with the weight 104 or a foreign object caught on the weight 104.

  Moreover, since the bag body 152 is accommodated in the weight 104 disposed at the lower end of the water blocking fence 17 in a state where the lower end of the water blocking fence 17 is sunk, the weight 104 and the bag body 152 are separately provided. The resistance of water can be reduced compared to the case where it is arranged. Therefore, water can be smoothly flowed from the lower side of the water blocking fence 17 to the downstream side.

  Further, as the bag body 152 is housed in the weight body 104 in this manner, the bag body 152 is prevented from being damaged by the contact with a foreign object such as a driftwood. Therefore, there is also an advantage that the durability of the floating and sinking fence 100 can be improved.

  In the above embodiment, the floats 18 (A, B) are composed of the fixed float 18 (A) and the floating float 18 (B), but the present invention is not limited to this. A) It may be constituted only, and can be changed suitably.

DESCRIPTION OF SYMBOLS 1, 100 Floating and sinking type fence 4, 104 Weight 5 bag body 6 Air supply machine 17 Water blocking fence 18 Float 18 (A) Fixed float 18 (B) Floating and sinking float 18 (B-1) Floating and floating floating sink 18 (B-2) Flow-only float 51 The first bag 52 The second bag

Claims (6)

A float floating on a water surface, a water blocking fence hanging down from the float in water, a weight for sinking the lower end of the water blocking fence, and floating force of air so that the lower end of the water blocking fence can float And a bag body capable of supplying and discharging air,
One of the weight and the bag body is accommodated in the other, and the floating and sinking fence is characterized. The bag body includes a cone accommodating portion for accommodating the cone,
The floating and sinking fence according to claim 1, wherein the weight is housed in the weight housing portion. The bag body includes a first bag body supported by the lower end of the water shielding fence, and a second bag body accommodated in the first bag body.
The second bag body is formed to be able to supply and discharge air.
The floating and sinking fence according to claim 2, wherein the weight accommodating portion is formed in the second bag body. The weight has a cylindrical shape having a bag housing portion inside, and includes a cylindrical body having a plurality of through holes communicating with the inside and the outside formed in a circumferential surface thereof.
The said bag body is accommodated in the said bag accommodating part, The floating sink fence of Claim 1 characterized by the above-mentioned.   5. The floating and sinking fence according to claim 4, wherein the cylindrical body has a circular cross-sectional outer shape or an elliptical shape. The floating and sinking fence according to any one of claims 1 to 5;
A detection unit that detects an external force acting on the water blocking fence by the water flow or a physical quantity proportional to the external force;
And a control unit configured to control the supply of air to the bag body in order to cause the lower end of the water blocking fence to rise when the detection value by the detection unit exceeds a set value.

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