JP2017029104A - Siphon-type water intake system - Google Patents

Abstract

CONSTITUTION: A siphon type intake system 10 is a system for conveying water using the principle of siphon and comprises a siphon pipe 12 extending from a water source 102 to a water supply destination 106 across a levee body 100. The siphon pipe is provided with a water supply stopping device 60 for stopping the supply of water feeding through the siphon pipe when the water level of the water source reaches a predetermined water level. The water supply stopping device includes, for example, an air intake port 62 provided with a variable installation height and a vent pipe 64 for connecting the air intake port and the siphon pipe.EFFECT: According to the present invention, the level of water in the water source can be prevented from dropping more than necessary due to discharge or leakage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a siphon-type water intake system, and in particular, to a siphon-type water intake system that supplies water to a water supply destination from a water source located across a bank body.

An example of a conventional siphon-type water intake system is disclosed in Patent Document 1. The siphon-type water intake device of Patent Literature 1 is a device that transports water from a water source such as a reservoir (reservoir) to a water supply destination using the principle of siphon, and a siphon pipe that is laid across a dam body. Prepare. At the highest point of the siphon tube, a bubble trapping chamber for trapping bubbles contained in the water flowing through the siphon tube is provided, and a water tank is provided above the bubble trapping chamber. Between the bubble trapping chamber and the water tank, bubble discharging means for discharging bubbles in the bubble trapping chamber into the water tank and supplying water in the water tank to the bubble trapping chamber is provided. According to the siphon-type water intake device of Patent Document 1, since air mixed in the siphon pipe is excluded, a stable siphon state is maintained for a long time.
Japanese Patent Laid-Open No. 2001-45888

  In the conventional siphon-type water intake system such as Patent Document 1, in order to improve convenience during water intake, it is important to maintain the siphon state by eliminating air mixing into the siphon pipe. No measures have been taken for emergency discharge in the event of a disaster or when unexpected water leakage occurs in the siphon tube.

  For example, an emergency discharge that lowers the water level of the reservoir to a safe water level due to an earthquake or heavy rain may be performed, but conventional siphon intake systems do not have a mechanism for automatically stopping the discharge. For this reason, the worker needs to monitor the site until the water level in the reservoir reaches the safe water level, and close the discharge valve when the water level reaches the safe water level. However, on-site monitoring and work at the time of emergency discharge are often dangerous, and it is difficult to secure personnel in an aging rural village in recent years.

  In addition, if the siphon pipe is damaged even if the downstream part of the siphon pipe is damaged or the discharge valve is forgotten to close, and an unexpected water leak occurs in the siphon pipe, Water intake from will continue. For this reason, if measures against water leakage are not taken, all stored water may be lost.

  Therefore, the main object of the present invention is to provide a novel siphon-type water intake system.

  Another object of the present invention is to provide a siphon-type water intake system that can prevent the water level from being lowered more than necessary due to discharge or water leakage.

  The present invention employs the following configuration in order to solve the above problems. Note that the reference numerals in parentheses and the description of capture indicate correspondence with the embodiments described later to help understanding of the present invention, and do not limit the present invention.

  A first invention is a siphon-type water intake system that supplies water to a water supply destination from a water source that is located across the bank body, and includes a siphon pipe that extends from the water source to the water supply destination across the bank body, and a siphon pipe A siphon-type water intake system provided with a water supply stop device that is provided and stops water supply by a siphon tube when the water level of a water source reaches a predetermined water level.

  In the first invention, the siphon-type water intake system is a system that transports water using the principle of the siphon, and includes a siphon pipe that extends from the water source to the water supply destination across the bank. The siphon tube is provided with a water supply stop device that stops water supply by the siphon tube when the water level of the water source reaches a predetermined set water level.

  According to the first invention, since the water supply stop device is provided to stop the water supply by the siphon tube when the water level of the water source reaches a predetermined set water level, the water level is prevented from lowering more than necessary due to discharge or water leakage. it can.

  The second invention is dependent on the first invention, and the water supply stop device stops water supply by the siphon tube by taking air into the siphon tube and interrupting the siphon state.

  In the second invention, when the water level of the water source reaches a predetermined set water level, the water supply stop device takes air into the siphon tube from the air intake and interrupts the siphon state. Thereby, the water supply by a siphon pipe | tube can be stopped easily.

  A third invention is dependent on the second invention, and the water supply stop device includes an air intake port provided with a variable installation height, and a vent pipe connecting the air intake port and the siphon tube.

  In 3rd invention, a water supply stop apparatus is provided with the air intake port provided in variable installation height. This air intake port is connected to the siphon tube by, for example, a flexible vent tube.

  According to the third invention, since the structure of the water supply stop device is simple, it can be introduced at a low cost. In addition, since the water supply stop device does not require a power source, there is no possibility of causing a system down when necessary due to an unexpected power loss due to a power failure or a lightning strike. Furthermore, since the installation height of the air intake port is variable, the installation height of the air intake port, that is, the set water level at which water supply is stopped can be freely changed according to usage needs.

  A fourth invention is dependent on the third invention and further includes a ventilation cutoff valve provided in the ventilation pipe.

  In the fourth invention, the ventilation pipe is provided with a ventilation cutoff valve capable of opening and closing the ventilation path in the ventilation pipe, for example, at the connection portion with the siphon pipe. For this reason, even when the water level of the water source is equal to or lower than the set water level, the siphon state can be restarted and water intake can be started by keeping the ventilation shutoff valve closed.

  According to 4th invention, the water of the water source below a setting water level can be taken with a siphon, and the water of an important water source as agricultural water can be utilized to the last.

  5th invention is dependent on 3rd or 4th invention, and is further provided with the protection pipe | tube which accommodates a ventilation pipe | tube.

  In the fifth invention, the vent pipe connecting the air intake port and the siphon pipe is housed and installed in the protective pipe. As the protective tube, for example, a corrugated flexible tube formed of a synthetic resin such as polyethylene is used.

  According to the fifth aspect of the invention, since the protective tube for housing the vent pipe is provided, the trauma resistance of the vent pipe is improved, and unnecessary air intake due to breakage of the vent pipe is prevented. That is, system failure due to breakage of the vent pipe is prevented.

  A sixth invention is dependent on any one of the third to fifth inventions, and the air intake port has a plurality of holes.

  In the sixth invention, the air intake port is formed with a plurality of holes dispersed. This prevents the air intake from being clogged with suspended matters in the water.

  According to the present invention, since the water supply stop device for stopping the water supply by the siphon tube when the water level of the water source reaches a predetermined set water level, the water level can be prevented from being lowered more than necessary due to discharge or water leakage.

  The above object, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is a side view which shows roughly the siphon type water intake system which is one Example of this invention. It is a top view which shows roughly the siphon type water intake system of FIG. It is the elements on larger scale which expand and show the extraction part connection joint part of the siphon type water intake system of FIG. It is an illustration figure which shows the extraction part connection coupling with which the siphon type water intake system of FIG. 1 is provided. It is the elements on larger scale which expand and show the air intake opening part of the siphon type water intake system of FIG. It is the elements on larger scale which expand and show the air intake opening part of the siphon type water intake system which is other Examples of this invention.

  Referring to FIG. 1, a siphon-type water intake system (hereinafter simply referred to as “system”) 10 according to an embodiment of the present invention is a farm field on the opposite side from a water source 102 such as a reservoir located across a bank body 100. This is a system for transporting water to 104 pipelines (water supply destinations) 106 using the principle of siphon, and includes a siphon pipe 12 laid across the bank body 100.

  As shown in FIGS. 1 to 3, the siphon pipe 12 includes a water source side pipe line 12a, a dam body top pipe line 12b, and a water supply side pipe line 12c, and appropriately connects synthetic resin or metal pipes and joints. It is piped by doing. In this embodiment, the siphon tube 12 is made of polyethylene. Moreover, the inner diameter of the siphon tube 12 is appropriately set according to the water intake scale, for example, 50 to 300 mm.

  Here, the bank body top pipe line 12 b is a pipe line that is piped to the top flat part of the bank body 100. Further, the water source side pipe line 12a is a pipe piped from the dam body top pipe line 12b to the water source 102 side. Specifically, the pipe extending from the water intake 14 to the upper end of the inclined part on the water source 102 side. Road. Further, the water supply side pipe line 12c is a pipe line that is piped from the bank body top pipe line 12b to the water supply destination 106 side. Specifically, the water supply side pipe line 12c reaches the siphon gate valve 16 from the upper end of the inclined portion on the water supply destination 106 side. This is a pipeline.

  The upstream portion of the water source side conduit 12a is a flexible tube (flexible tube), and a water intake float 20 is provided at the water intake port 14 which is the upstream end thereof. The water intake float 20 is for taking water having a relatively high temperature near the surface of the water source 102, and moves the water intake 14 up and down in accordance with fluctuations in the water level of the water source 102.

  An irrigation pipeline 106 is connected to the downstream end of the water supply side pipe line 12 c via the siphon gate valve 16. The siphon gate valve 16 is a gate valve for stopping the downstream end of the siphon tube 12 when starting the siphon and keeping the injected priming water in the siphon tube 12. Further, the siphon gate valve 16 is used as a water intake main plug for the pipeline 106 after the siphon is activated.

  Moreover, the gas capture tank 24 is connected to the levee body top pipe line 12b through the venting part connecting joint 22 as can be seen from FIG. The gas capture tank 24 captures air (gas) generated in the siphon tube 12 and temporarily stores it.

  A water-injection exhaust valve 34 is provided below the gas trapping tank 24 for discharging air in the siphon tube 12 when water is injected when the siphon is activated. In addition, an air extraction float 38 is connected to the top of the gas trapping tank 24 via an air extraction tube 36. The air extraction float 38 is for extracting air in the gas trapping tank 24 (and thus in the siphon tube 12), and includes an air extraction device 40. As the venting device 40, a known vacuum pump may be used. For example, a gas-liquid mixture suction device disclosed in Japanese Patent Application Laid-Open No. 2006-283733 can be suitably used. Further, the gas trapping tank 24 is provided with a water level detector 42 for detecting the water level in the gas trapping tank 24, and a control panel 46 and an air extraction float 38 are connected to the water level detector 42 via a cable 44. Connected. The water level data in the gas capture tank 24 detected by the water level detector 42 is transmitted to the control panel 46. When the water level in the gas trapping tank 24 becomes lower than the set value (that is, when the air is trapped in the gas trapping tank 24), the control panel 46 operates the venting device 40 of the ventilating float 38 to make the gas The air in the capture tank 24 is automatically extracted.

  The venting portion connecting joint 22 is a joint for connecting the venting portions such as the gas trapping tank 24 and the venting float 38 to the dam body top pipe line 12b. As shown in FIG. 4, the ventilating portion connecting joint 22 has both ends 26 a connected to the dam body top pipe line 12 b to form a part of the dam body top pipe line 12 b, and the joint body 26. A rising pipe section 28 is provided that branches in a vertical direction from the top of the pipe and whose upper end portion 28 a is connected to the gas trapping tank 24. Both end portions 26a of the joint body 26 and the upper end portion 28a of the rising pipe portion 28 are flanges. However, for the connection between the joint body 26 and the siphon pipe 12 and the connection between the riser pipe portion 28 and the gas trapping tank 24, an appropriate connection method may be employed depending on the material, size, etc. In addition, mechanical bonding, fusion bonding, adhesive bonding, or the like may be used.

  The joint body 26 of the ventilating part connection joint 22 is provided with a water injection part 30 for injecting priming water into the siphon pipe 12 when the siphon is activated. A water injection pump 54 is connected to the water injection unit 30 via a water injection pipe 50 and a water injection valve 52. The inner diameters of the water injection part 30 and the water injection pipe 50 are, for example, 30-80 mm.

  Specifically, the water injection section 30 has a receiving shape whose tip is connected to the water injection pipe 50, extends in parallel with the joint main body 26, and then at an acute angle toward the water supply side pipe line 12 c. To join. That is, the water injection part 30 merges with an inclination angle with respect to the bank body top pipe line 12b. At this time, the angle at which the water injection part 30 joins the joint body 26 is preferably 45 ° or less with respect to the tube axis of the joint body 26. This is to allow the priming water flowing into the siphon pipe 12 from the water injection section 30 to flow smoothly toward the water supply side pipe line 12c. Moreover, it is preferable that the circumferential position where the water injection part 30 merges with the joint body 26 avoids the pipe top of the joint body 26. This is to prevent the gas generated in the siphon tube 12 from accumulating in the water injection unit 30. In addition, the axial direction position where the water injection part 30 merges with the joint main body 26 is not specifically limited, You may make it merge in the upstream part of the joint main body 26, and may make it merge in a downstream part. Thus, the priming water supplied from the water injection pipe 50 through the water injection part 30 at the time of siphon activation is achieved by joining the water injection part 30 to the water supply side pipe line 12c at an acute angle with respect to the dam body top pipe line 12b. Water is preferentially poured into the water supply side pipe line 12c.

  In addition, the rising pipe portion 28 of the venting portion connecting joint 22 is provided with a vent pipe connecting portion 56 to which a vent pipe 64 described later is connected. The vent pipe connecting portion 56 is connected to an end portion of the vent pipe 64 to constitute a part of the vent pipe 64. The vent pipe connection portion 56 is provided with a vent block valve 58 that can open and close the vent path in the vent pipe 64.

  Returning to FIG. 1 to FIG. 3, the siphon tube 12 is provided with a water supply stopping device 60 that automatically stops water supply by the siphon tube 12 when the water level of the water source 102 reaches a predetermined set water level. The water supply stop device 60 includes an air intake port 62 and an air pipe 64 for taking air into the siphon tube 12. One end portion of the vent pipe 64 is connected to the vent pipe connecting portion 56 provided in the venting portion connecting joint 22 as described above, and the other end portion (tip end portion) of the vent pipe 64 is connected to the air intake port 62. Is provided.

  Specifically, as shown in FIG. 5, the air intake port 62 is formed in a cylindrical shape with a top and bottom by an appropriate material such as a synthetic resin such as polyethylene and polyvinyl chloride, or a metal. The air intake port 62 is formed with a plurality of holes 62a on the entire surface (side surfaces and both end surfaces). As the vent pipe 64, a flexible pressure-resistant tube formed of a synthetic resin such as polyurethane and polyamide, rubber, or the like is used.

  The inner diameter of the vent pipe 64 is, for example, 13 mm. Moreover, the diameter of each hole 62a which the air intake port 62 has is set a little smaller than the internal diameter of the vent pipe 64, for example, is 10 mm. In this way, by setting the diameter of each hole 62 a of the air intake port 62 to be smaller than the inner diameter of the vent pipe 64, large underwater floating substances that clog the vent pipe 64 enter the vent pipe 64. It is prevented. That is, the air intake port 62 of this embodiment also functions as a filter that prevents the ventilation pipe 64 from being clogged by entry of suspended matters in the water. Further, by forming a plurality of holes 62a in a plurality of directions in the air intake port 62, the air intake port 62 itself is prevented from being clogged with suspended matters in the water.

  And the air intake port 62 is fixed to the outer peripheral surface of the water source side pipe line 12a at the height position of the set water level of the water source 102 using a fixture 66 such as a fixing band. Here, since the air intake port 62 is connected to the siphon tube 12 using a flexible ventilation tube 64, the installation height thereof is variable. That is, the installation height of the air intake port 62 can be changed, and the user of the system 10 can freely set the installation height (that is, the set water level) of the air intake port 62 according to the use needs. Can change. In this embodiment, the air intake 62 is installed at the height of the safe water level, which is the target water level when urgently discharging during a disaster or the like. When it becomes necessary to change the set water level for stopping water supply, after removing the fixture 66 from the air intake port 62 or moving the air intake port 62 up and down with the fixture 66 loosened, The air intake port 62 may be fixed at a desired height position by using the fixture 66 again.

  Next, a method for starting water intake by activating a siphon in the system 10 will be described. First, the siphon gate valve 16 located at the downstream end of the siphon pipe 12 is closed, and the water injection exhaust valve 34 provided in the gas capture tank 24 is opened. Further, the ventilation shutoff valve 58 provided in the ventilation pipe connecting portion 56 (the ventilation pipe 64) is also opened. Next, the water injection valve 52 provided in the water injection pipe 50 is opened, the water injection pump 54 is activated, the water of the water source 102 is pumped up, and water is injected from the water injection part 30 into the siphon pipe 12 as priming water. At this time, since the water injection section 30 is provided at an acute angle toward the water supply side pipe line 12c, the priming water is preferentially filled from the water supply side pipe line 12c. When it is confirmed that water is discharged from the water supply exhaust valve 34, that is, when the water supply side conduit 12c is full, the water injection pump 54 is stopped, and the water injection valve 52 and the water supply exhaust valve 34 are closed. .

  Next, the control panel 46 is turned on to bring the control panel 46 into an operating state. At this time, since the gas trapping tank 24 is filled with air and is below a predetermined water level, the venting device 40 of the venting float 38 is operated, and the air in the gas trapping tank 24 is vented. Thereby, the inside of the gas capture tank 24 and the inside of the siphon pipe 12 are in a decompressed state, and priming water is sucked up from the water source 102 into the water source side pipe line 12a. At this time, since the water supply side pipe line 12c is already full, water can be easily sucked into the water source side pipe line 12a by the venting device 40. Further, since the air in the gas trapping tank 24 is vented, the inside of the vent pipe 64 is also decompressed, so that water is sucked into the vent pipe 64 from the water source 102 and the inside of the vent pipe 64 is also full. Become.

  Thereafter, when it is confirmed that the gas trapping tank 24 is full, that is, when the entire siphon pipe 12 is full, the siphon gate valve 16 is opened. Thereby, water intake by a siphon is started.

  As described above, after the water supply side pipe line 12c of the siphon pipe 12 is first filled with the water injection pump 54, the water source side pipe line 12a is inserted into the water source side pipe line 12a from the water source 102 using the air extraction device 40 of the air extraction float 38. By sucking the priming water and filling the entire siphon pipe 12 with water, the siphon water intake can be efficiently started without providing a check valve in the water source side pipe line 12a.

  In such a system 10, after the siphon tube 12 is in a siphon state, that is, water can be taken in according to the principle of the siphon, the siphon gate valve 16 that is used as a main plug is placed on an operator (use of the system 10 Open / close control of whether or not water is supplied to the pipeline 106 of the farm 104. For example, in order to stop irrigation for the field 104 at night, when the siphon gate valve 16 is closed, water supply to the pipeline 106 is stopped. In the next morning, when resuming irrigation to the field 104, if the siphon gate valve 16 is opened, water supply to the pipeline 106 by the siphon is resumed.

  On the other hand, when an emergency discharge is performed to lower the water level of the water source 102 to a safe water level due to an earthquake or heavy rain, the siphon gate valve 16 is opened by an operator, so that the water in the water source 102 is supplied to the siphon tube 12. And it is discharged into a river etc. via the pipeline 106 grade | etc.,. However, although not shown, a discharge pipe and a discharge valve branched from the downstream end of the siphon pipe 12 or the upstream end of the pipeline 106 are separately provided. The water from the water source 102 may be discharged into a river or the like.

  After the emergency discharge is started, when the water level of the water source 102 drops to the safe water level (set water level) and the air intake port 62 is exposed to the air, air enters the ventilation pipe 64 from each hole 62a of the air intake port 62. Flows in. The air flowing into the vent pipe 64 is taken into the siphon pipe 12 through the vent pipe 64 and interrupts the siphon state in the siphon pipe 12. Thereby, water supply by the siphon tube 12 is stopped.

  Thus, by providing the water supply stop device 60 for the system 10, the water supply by the siphon tube 12 is automatically stopped when the water level of the water source 102 reaches the safe water level. There is no need to monitor the water level until the water level reaches the safe water level, or to close the siphon gate valve 16 (discharge valve) when the water level becomes safe. Therefore, the worker can evacuate immediately to a safe place after the siphon gate valve 16 is opened and emergency discharge is started, and the work load is reduced.

  In addition to the emergency discharge, when the downstream portion of the water supply side pipe 12c of the siphon pipe 12 is damaged or the siphon gate valve 16 is forgotten to be closed, unexpected water leakage occurs in the siphon pipe 12. The water supply by the siphon tube 12 is automatically stopped by the water supply stop device 60 when the water level of the water source 102 reaches the set water level. Therefore, even when unexpected water leakage occurs in the siphon tube 12, it is possible to prevent the water source 102, which is important as agricultural water, from being wasted.

  Further, in the system 10, a ventilation blocking valve 58 is provided at the upstream end portion of the ventilation pipe 64. For this reason, when water intake from the water source 102 is to be performed when the water level of the water source 102 is equal to or lower than the set water level, the ventilation shutoff valve 58 is closed to perform the same as the above-described water intake start method. Then, the siphon state can be restarted and water intake can be started. That is, even when the water in the water source 102 is below the set water level, water can be taken by the siphon, and the water from the water source 102 that is important as agricultural water can be used to the end.

  As described above, according to this embodiment, when the water level of the water source 102 reaches a predetermined set water level, water is taken into the siphon tube 12 and the siphon state is interrupted, thereby supplying water through the siphon tube 12. Since the water supply stop device 60 for automatically stopping is provided in the siphon tube 12, it is possible to appropriately prevent an unnecessary decrease in the water level of the water source 102 due to discharge or water leakage.

  Further, according to this embodiment, the water supply stop device 60 has a simple configuration in which the air intake port 62 and the siphon tube 12 are connected by the vent tube 64, and therefore can be introduced at a low cost. Moreover, since the water supply stop device 60 does not require a power source, there is no possibility of causing a system down when necessary due to an unexpected power loss due to a power failure or a lightning strike.

  Furthermore, according to this embodiment, since the installation height of the air intake port 62 is variable by using the flexible ventilation pipe 64, the user of the system 10 can adjust the air according to the usage needs. The installation height of the intake port 62, that is, the set water level for stopping water supply can be freely changed.

  In the above-described embodiment, the vent pipe 64 is installed in a state exposed to the outside. However, as in the embodiment shown in FIG. 6, the vent pipe 64 is accommodated in a flexible protective pipe 68. It can also be installed. The protective tube 68 may be provided for the entire length of the ventilation pipe 64 or a portion where the ventilation pipe 64 may be immersed in the water source 102. The protective tube 68 is preferably formed of an opaque material. For example, a corrugated flexible tube formed of a synthetic resin such as polyethylene is used as the protective tube 68.

  As in the embodiment shown in FIG. 6, by providing the protective tube 68 that accommodates the vent pipe 64, the trauma resistance of the vent pipe 64 is improved, and unnecessary air intake due to breakage of the vent pipe 64 is prevented. The That is, system failure due to breakage of the vent pipe 64 is prevented. Further, when a transparent tube is used as the vent pipe 64, algae may be generated by photosynthesis in the vent pipe 64, but by storing the vent pipe 64 in the opaque protective pipe 68, This is prevented.

  In the above-described embodiment, the vent pipe connecting portion 56 for connecting the vent pipe 64 to the siphon pipe 12 is provided in the vent section connecting joint 22 provided in the dam body top pipe line 12b of the siphon pipe 12. Although the ventilation shutoff valve 58 is provided in the vent pipe connecting portion 56, the positions where the vent pipe connecting portion 56 and the vent shutoff valve 58 are provided are not particularly limited and can be appropriately changed. However, the position of the ventilation shutoff valve 58 provided in the ventilation pipe 64 is preferably a part that is piped to the top flat part of the bank body 100 in consideration of safety of the opening / closing operation.

  Furthermore, in the above-described embodiment, the air intake port 62 is formed in a cylindrical shape with a bottom, and a plurality of holes 62a are formed on the entire surface. However, the shape of the air intake port 62 and the holes The number and arrangement of 62a can be changed as appropriate. For example, the air intake port 62 may be formed in a rectangular parallelepiped shape or a spherical shape. Moreover, you may utilize the front-end | tip part of the vent pipe 64 as the air intake port 62 as it is.

  Furthermore, in the above-described embodiment, the air intake port 62 is attached to the outer peripheral surface of the water source side conduit 12a of the siphon tube 12, but the present invention is not limited to this. For example, a pole may be erected on the water source 102 and the air intake 62 may be attached to the pole.

  In the above-described embodiment, a flexible pressure-resistant tube is used as the vent pipe 64 in order to make the installation height of the air intake port 62 variable. However, the vent pipe 64 does not necessarily extend over the entire length. It is not necessary to have flexibility. For example, only the tip portion of the vent pipe 64 on the side of the air intake port 62 may be flexible so as to correspond to the height range in which the installation height of the air intake port 62 is desired to be changed. The same applies to the protective tube 68 that only the distal end portion may have flexibility. Further, for example, a plurality of holes serving as air intake ports are formed in advance at the tip portion of the vent pipe 64 so that the height positions are different, and holes other than a desired height position (set water level) are formed. By closing, the installation height of the air intake can be changed.

  Furthermore, in the above-described embodiment, the water supply stop device 60 that stops the water supply by the siphon tube 12 by taking air into the siphon tube 12 and interrupting the siphon state is used, but the present invention is not limited to this. For example, as the water supply stop device, an electric valve such as an electric gate valve capable of opening and closing a water passage in the siphon tube 12 can be used. In this case, the water source 102 is provided with a water level sensor for measuring the water level. Then, when the water level sensor detects that the water level of the water source 102 has reached a predetermined set water level, the water supply path through the siphon tube 12 is sealed by operating the motorized valve to seal the water passage in the siphon tube 12. Should be automatically stopped.

  Furthermore, in the above-described embodiment, the siphon gate valve 16 and the separately provided discharge valve (emergency release valve) are assumed to be manual valves that are manually opened and closed by an operator. The discharge valve or the like can be an electrically operated valve that can be operated remotely. Thereby, at the time of emergency discharge, a series of operations from the start of emergency discharge to the stop of discharge at the safe water level can be performed safely and easily in a remote place without approaching the dam body 100 and the water source 102.

  Further, in the above-described embodiment, in order to efficiently activate the siphon, the siphon activation method in which the water supply side pipe 12c of the siphon tube 12 is first filled is adopted. The present invention including the water supply stop device can be appropriately changed and can be employed in various conventional siphon-type water intake systems.

  It should be noted that the specific numerical values such as the dimensions given above are merely examples, and can be appropriately changed according to necessity such as product specifications.

DESCRIPTION OF SYMBOLS 10 ... Siphon type water intake system 12,12a, 12b, 12c ... Siphon pipe 14 ... Water intake 16 ... Siphon gate valve 20 ... Water intake float 22 ... Air extraction part connection joint 24 ... Gas capture tank 40 ... Air extraction device 50 ... Water injection pump 58 ... Ventilation shutoff valve 60 ... Water supply stop device 62 ... Air intake port 64 ... Ventilation pipe 68 ... Protection pipe 100 ... Bank body 102 ... Water source 106 ... Pipeline (water supply destination)

Claims (6)

A siphon-type water intake system that supplies water to a water supply destination from a water source located across a levee body,
A siphon pipe extending from the water source to the water supply destination across the bank body, and a water supply stop device provided in the siphon pipe and stopping water supply by the siphon pipe when the water level of the water source reaches a predetermined water level , Siphon type water intake system.   The siphon-type water intake system according to claim 1, wherein the water supply stop device stops water supply by the siphon tube by taking air into the siphon tube and interrupting the siphon state. The water supply stop device is
The siphon-type water intake system according to claim 2, further comprising: an air intake port provided with a variable installation height; and a vent pipe that connects the air intake port and the siphon tube.   The siphon type water intake system according to claim 3, further comprising a ventilation cutoff valve provided in the ventilation pipe.   The siphon-type water intake system according to claim 3 or 4, further comprising a protective tube for housing the vent tube.   The siphon-type water intake system according to claim 3, wherein the air intake port has a plurality of holes.

Images