JP6625843B2 - Siphon intake system - Google Patents

Description

  The present invention relates to a siphon-type intake system, and more particularly to a siphon-type intake system that supplies water to a water supply destination from a water source located across a bank, for example.

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 by using the principle of siphon, and a siphon pipe laid across a bank body. Prepare. At the highest point of the siphon tube, a bubble trap chamber for trapping bubbles contained in water flowing in the siphon tube is provided, and a water tank is provided above the bubble trap chamber. A bubble discharging means is provided between the bubble capturing chamber and the water tank to discharge bubbles in the bubble capturing chamber into the water tank and supply water in the water tank to the bubble capturing chamber. According to the siphon-type water intake device of Patent Literature 1, the air mixed in the siphon pipe is removed, so that a stable siphon state is maintained for a long time.
JP 2001-45888 A

  In a conventional siphon-type water intake system such as Patent Literature 1, in order to improve convenience at the time of water intake, it is important to maintain a siphon state by eliminating air from entering the siphon pipe, No measures have been taken in the event of emergency discharge in the event of a disaster or unexpected leakage of siphon pipes.

  For example, an emergency water discharge may be performed to lower the water level of the reservoir to a safe water level due to an earthquake or heavy rain, for example. However, the conventional siphon-type water intake system has no mechanism for automatically stopping the water discharge. For this reason, it is necessary for the worker to monitor the water level in the reservoir until the water level reaches the safe water level, and to close the discharge valve when the water level reaches the safe water level. However, on-site surveillance and work during an emergency release often involves dangers, and it is difficult to secure personnel in aging rural villages in recent years.

  In addition, even if the siphon tube is damaged or the discharge valve is forgotten to close and the siphon tube unexpectedly leaks, if the siphon condition in the siphon tube is maintained, the reservoir Water intake from will continue. For this reason, if no countermeasures are taken against water leakage, all stored water may be lost.

  Therefore, a primary 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 capable of preventing a water source from unnecessarily lowering in water level due to discharge or leakage.

  The present invention has the following features to attain the object mentioned above. The reference numerals in parentheses, the description of capture, and the like show the correspondence with the embodiment described later to facilitate understanding of the present invention, and do not limit the present invention in any way.

A first invention is a siphon-type water intake system that supplies water to a water supply destination from a water source located across a bank, and includes a siphon pipe extending from a water source to a water supply destination across a bank and a siphon pipe. provided, e Bei a water stop device for stopping the water supply by the siphon tube when the water level of the water source has reached a predetermined water level, the water supply stop device, air inlet provided the installation height variable, and flexible A ventilation pipe for connecting the air intake port and the siphon pipe, wherein the air intake port is fixed to the outer peripheral surface of the siphon pipe provided on the water source side at a predetermined water level, and the water supply is stopped. The apparatus is a siphon-type water intake system that stops the water supply by the siphon pipe by taking in air from the air intake port into the siphon pipe to interrupt the siphon state .

In the first invention, the siphon-type water intake system is a system for transporting water using the principle of a siphon, and includes a siphon pipe extending from a water source to a water supply destination across a bank. The siphon pipe is provided with a water supply stop device for stopping water supply by the siphon pipe when the water level of the water source reaches a predetermined set water level. Further, the water supply stopping device includes an air intake port whose installation height is variably provided, and the air intake port is connected to the siphon pipe by a flexible ventilation pipe. Further, the air intake port is fixed to the outer peripheral surface of the siphon pipe provided on the water source side at a predetermined set water level. Then, when the water level of the water source reaches a predetermined set water level, the water supply stopping device takes in air into the siphon pipe from the air intake port to interrupt the siphon state. Thereby, water supply by the siphon pipe can be easily stopped.

According to the first invention, since the water supply stop device for stopping the water supply by the siphon pipe when the water level of the water source reaches the predetermined set water level is provided, it is possible to prevent the water source from being unnecessarily lowered due to discharge or leakage. it can. Further, since the configuration of the water supply stopping device is simple, it can be introduced at a low cost. Further, since the water supply stop device does not require a power source, there is no possibility that the system will be shut down when necessary due to an unexpected power loss due to a power failure or lightning strike. Furthermore, since the installation height of the air intake is variable, the installation height of the air intake, that is, the set water level at which the water supply is stopped can be freely changed according to the use needs.

The second invention is a siphon-type water intake system that supplies water to a water supply destination from a water source located across a bank, and includes a siphon pipe extending from a water source to a water supply destination across a bank and a siphon pipe. A water stop device is provided to stop water supply by the siphon pipe when the water level of the water source reaches a predetermined water level.The predetermined water level is the height position of the safety water level that is the target water level for emergency discharge in the event of a disaster or the like. This is a siphon type water intake system.

A third invention is according to the first or second invention, wherein a restart means capable of restarting the siphon state of the siphon tube and restarting water intake after stopping water supply by the siphon tube by the water supply stop device. Further prepare.

A fourth invention is a siphon-type water intake system that supplies water to a water supply destination from a water source located across a bank, and includes a siphon pipe extending from the water source to the water supply destination across the bank, and a siphon pipe. A water supply stop device for stopping water supply by the siphon pipe when the water level of the water source reaches a predetermined water level, the water supply stop device has an air intake port variably provided at an installation height, and an air intake port And a siphon pipe that connects the siphon pipe to the siphon pipe, and the water feed stop device stops the siphon pipe from feeding water by taking in air from the air intake port into the siphon pipe to interrupt the siphon state. Bei El ventilation shutoff valve for a siphon intake system.

  In the fourth invention, the ventilation pipe is provided with a ventilation shutoff valve that can open and close a ventilation path in the ventilation pipe, for example, at a 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 closing the ventilation shutoff valve.

  According to the fourth invention, the water of the water source equal to or lower than the set water level can be taken by the siphon, and the water of the important water source as the agricultural water can be used to the last.

A fifth invention is according to the fourth invention, and further includes a protection tube for housing the ventilation tube.

  In the fifth invention, the ventilation pipe connecting the air intake and the siphon pipe is housed and installed in the protection 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 present invention, since the protection pipe for accommodating the ventilation pipe is provided, the trauma resistance of the ventilation pipe is improved, and unnecessary intake of air due to breakage of the ventilation pipe is prevented. That is, system failure due to breakage of the ventilation pipe is prevented.

A sixth invention is according to the fourth or fifth invention, wherein the air intake has a plurality of holes.

  In the sixth invention, a plurality of holes are dispersedly formed in the air intake. This prevents the air intake from being clogged by floating substances in the water.

  According to the present invention, since the water supply stop device for stopping the water supply by the siphon pipe when the water level of the water source reaches the predetermined set water level is provided, it is possible to prevent the water source from lowering more than necessary due to discharge or leakage.

  The above and 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.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows schematically the siphon type water intake system which is one Example of this invention. FIG. 2 is a plan view schematically showing the siphon type water intake system of FIG. 1. FIG. 2 is a partially enlarged view showing, in an enlarged manner, a bleeding part connection joint part of the siphon type water intake system of FIG. FIG. 2 is an illustrative view showing a ventilating portion connection joint provided in the siphon type water intake system of FIG. 1. FIG. 2 is a partially enlarged view showing an air intake portion of the siphon type intake system of FIG. 1 in an enlarged manner. It is a partial enlarged view which expands and shows the air intake part of the siphon type water intake system which is another Example 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 includes a field on the opposite side from a water source 102 such as a reservoir located across a bank 100. This is a system for transporting water to the pipeline (water supply destination) 104 using the siphon principle, and includes a siphon pipe 12 laid across the embankment body 100.

  As shown in FIGS. 1 to 3, the siphon pipe 12 includes a water source side pipe 12a, an embankment top pipe 12b, and a water supply side pipe 12c, and appropriately connects synthetic resin or metal pipes and joints. By being plumbed. In this embodiment, the siphon tube 12 is made of polyethylene. The inner diameter of the siphon tube 12 is appropriately set according to the water intake scale, and is, for example, 50 to 300 mm.

  Here, the embankment top pipe 12b is a pipe that is piped to a flat top portion of the embankment 100. Further, the water source side pipe 12a is a pipe that is piped from the embankment top pipe 12b to the water source 102 side, and specifically, a pipe from the intake port 14 to the upper end of the inclined portion on the water source 102 side. Road. Further, the water supply side pipe 12c is a pipe that is piped from the embankment body top pipe 12b to the water supply destination 106 side, and specifically, from the upper end of the inclined part on the water supply destination 106 side to the siphon gate valve 16. Up to the pipeline.

  The upstream part of the water source side pipeline 12a is a flexible pipe (flexible pipe), and a water intake float 20, which is an upstream end thereof, is provided at a water intake port 14. The water intake float 20 is for taking in 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 a change in the water level of the water source 102.

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

  In addition, a gas trapping tank 24 is connected to the embankment top pipe line 12b via a vent connection joint 22, as can be clearly understood from FIG. The gas capturing tank 24 captures and temporarily stores air (gas) generated in the siphon tube 12.

  A water injection exhaust valve 34 for discharging air from the siphon tube 12 at the time of water injection when starting the siphon is provided below the gas capture tank 24. In addition, a venting float 38 is connected to the top of the gas capturing tank 24 via a venting tube 36. The deaeration float 38 is for extracting air from the gas trapping tank 24 (and, consequently, the inside of the siphon tube 12), and includes a deaeration device 40. A well-known vacuum pump may be used as the degassing device 40. For example, a gas-liquid mixture suction device disclosed in JP-A-2006-283733 can be suitably used. Further, the gas trapping tank 24 is provided with a water level detector 42 for detecting a water level in the gas trapping tank 24. The water level detector 42 includes a control panel 46 and a deaeration float 38 via a cable 44. Connected. The water level data in the gas capturing 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 equal to or lower than the set value (that is, when the air is trapped in the gas trapping tank 24), the control panel 46 operates the degassing device 40 of the degassing float 38, The air in the capture tank 24 is automatically extracted.

  The vent connection joint 22 is a joint for connecting a vent portion such as the gas capture tank 24 and the vent float 38 to the embankment top line 12b. As shown in FIG. 4, the vent connection joint 22 has two ends 26 a connected to the embankment top conduit 12 b to form a part of the embankment top conduit 12 b and a joint main body 26. A riser portion 28 is provided which branches vertically from the top of the tube and has an upper end 28 a connected to the gas capturing tank 24. Both ends 26a of the joint main body 26 and upper ends 28a of the riser pipes 28 are flanges. However, the connection between the joint body 26 and the siphon pipe 12 and the connection between the riser pipe section 28 and the gas trapping tank 24 may be made by an appropriate connection method depending on the material and size of the pipe. Alternatively, mechanical bonding, fusion bonding, adhesive bonding, or the like may be used.

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

  Specifically, the water injection section 30 has a receiving port shape whose tip end is connected to the water injection pipe 50, extends parallel to the joint main body 26, and then forms an acute angle toward the water supply side pipe line 12 c at the joint main body 26. To join. That is, the water injection unit 30 joins the embankment body top pipeline 12b at an inclined angle. At this time, the angle at which the water injection section 30 joins the joint main body 26 is preferably 45 ° or less with respect to the pipe axis of the joint main 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 pipeline 12c. Further, it is preferable that the circumferential position where the water injection section 30 joins with the joint body 26 avoids the pipe top of the joint body 26. This is to prevent gas generated in the siphon tube 12 from accumulating in the water injection unit 30. The axial position at which the water injection section 30 joins the joint body 26 is not particularly limited, and may be joined at the upstream portion of the joint body 26 or at the downstream portion. In this way, the priming water supplied from the water injection pipe 50 via the water injection part 30 at the time of siphon activation is formed by merging the water injection part 30 at the acute angle toward the water supply side pipe 12c with respect to the embankment body top pipe 12b. , Water is preferentially injected into the water supply pipe 12c.

  In addition, a vent pipe connecting section 56 to which a vent pipe 64 to be described later is connected is provided in the riser pipe section 28 of the vent connection part 22. The ventilation pipe connection part 56 is connected to an end of the ventilation pipe 64 and forms a part of the ventilation pipe 64. The ventilation pipe connection portion 56 is provided with a ventilation shutoff valve 58 that can open and close a ventilation path in the ventilation pipe 64.

  Returning to FIG. 1 to FIG. 3, the siphon pipe 12 is provided with a water feed stop device 60 for automatically stopping the water supply by the siphon pipe 12 when the water level of the water source 102 reaches a predetermined set water level. The water supply stopping device 60 includes an air intake port 62 for taking in air into the siphon pipe 12 and a ventilation pipe 64. One end of the ventilation pipe 64 is connected to the ventilation pipe connecting section 56 provided in the vent connection joint 22 as described above, and the other end (end) of the ventilation 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 a bottom using a suitable material such as a synthetic resin such as polyethylene and polyvinyl chloride or a metal. The air intake 62 has a plurality of holes 62a formed on the entire surface (side surfaces and both end surfaces). As the ventilation tube 64, a flexible pressure-resistant tube made of a synthetic resin such as polyurethane or polyamide, rubber, or the like is used.

  The inside diameter of the ventilation pipe 64 is, for example, 13 mm. The diameter of each hole 62a of the air intake 62 is set slightly smaller than the inner diameter of the ventilation pipe 64, and is, for example, 10 mm. In this way, by setting the diameter of each hole 62a of the air intake 62 to be smaller than the inner diameter of the ventilation pipe 64, a large underwater floating substance that clogs the ventilation pipe 64 enters the ventilation pipe 64. 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 floating substances in the water. In addition, by forming the plurality of holes 62a in the air intake 62 in a dispersed manner in a plurality of directions, it is possible to prevent the air intake 62 itself from being clogged by floating substances in the water.

  The air intake port 62 is fixed to the outer peripheral surface of the water source side pipe 12a at a height position of the set water level of the water source 102 using a fixing tool 66 such as a fixing band. Here, since the air intake port 62 is connected to the siphon pipe 12 using the flexible ventilation pipe 64, the installation height 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 be changed. In this embodiment, the air intake port 62 is installed at a height of a safety water level which is a target water level for emergency discharge at the time of disaster or the like. When it is necessary to change the set water level for stopping the water supply, after removing the fixture 66 from the air intake port 62 or moving the air intake port 62 in the vertical direction with the fixture 66 loosened, It is preferable to fix the air intake port 62 at a desired height position by using the fixing tool 66 again.

  Subsequently, a method of starting the siphon in the system 10 to start water intake 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 capturing tank 24 is opened. Further, the ventilation shutoff valve 58 provided in the ventilation pipe connecting portion 56 (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 to pump up water from the water source 102, and the water is injected into the siphon pipe 12 from the water injection section 30 as priming water. At this time, since the water injection section 30 is provided at an acute angle toward the water supply side pipeline 12c, the priming water is preferentially filled from the water supply side pipeline 12c. Then, when it is confirmed that water comes out of the water injection exhaust valve 34, that is, when the water supply side pipeline 12 c is full, the water injection pump 54 is stopped, and the water injection valve 52 and the water injection exhaust valve 34 are closed. .

  Next, the power of the control panel 46 is turned on, and the control panel 46 is brought into an operating state. At this time, since the inside of the gas trapping tank 24 is full of air and is below the predetermined water level, the degassing device 40 of the degassing float 38 is operated, and the air in the gas trapping tank 24 is evacuated. As a result, the inside of the gas trapping tank 24 and the inside of the siphon pipe 12 are decompressed, and the priming water is sucked from the water source 102 into the water source side pipe 12a. At this time, since the water supply side pipe 12c is already full, the water can be easily sucked up into the water source side pipe 12a by the deaerator 40. In addition, since the air in the gas capturing tank 24 is evacuated, the inside of the ventilation pipe 64 is also in a reduced pressure state, so that water is sucked up from the water source 102 into the ventilation pipe 64, and the inside of the ventilation pipe 64 is also full. Become.

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

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

  In such a system 10, after the inside of the siphon pipe 12 is in a siphon state, that is, after a state in which water can be withdrawn by the principle of the siphon, a siphon gate valve 16 used as a main stopper is changed by an operator (use of the system 10). ), The availability of water supply to the pipeline 106 in the field 104 is controlled. For example, in the case of stopping watering the field 104 at night, when the siphon gate valve 16 is closed, the water supply to the pipeline 106 is stopped. Then, in the next morning, when the irrigation of the field 104 is restarted, the siphon gate valve 16 is opened to restart the siphon water supply to the pipeline 106.

  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, and the water of the water source 102 is drained from the siphon pipe 12. And discharged into a river through a pipeline 106 or the like. 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, and at the time of emergency discharge, the discharge pipe is connected through the discharge pipe. The water of the water source 102 may be discharged to 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, the air enters the ventilation pipe 64 from each hole 62a of the air intake port 62. Flows in. The air that has flowed into the ventilation pipe 64 passes through the ventilation pipe 64 and is taken into the siphon pipe 12 to interrupt the siphon state in the siphon pipe 12. Thereby, the water supply by the siphon pipe 12 is stopped.

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

  In addition, even when emergency discharge is not performed, 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, and unexpected water leakage occurs in the siphon pipe 12. When the water level of the water source 102 reaches the set water level, the water supply by the siphon pipe 12 is automatically stopped by the water supply stop device 60. 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 shutoff valve 58 is provided at an upstream end of the ventilation pipe 64. For this reason, when water is to be taken from the water source 102 when the water level of the water source 102 is equal to or lower than the set water level, the ventilation shut-off valve 58 is closed so that the above-described method of starting water intake is performed. Thus, the siphon state can be restarted to start water intake. That is, even when the water of the water source 102 is lower than the set water level, water can be taken by the siphon, and the water of 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 the predetermined set water level, the siphon state is interrupted by taking in the air into the siphon pipe 12 so that the water supply by the siphon pipe 12 is stopped. Since the water supply stop device 60 for automatically stopping the water supply is provided in the siphon pipe 12, it is possible to appropriately prevent the water level of the water source 102 from unnecessarily lowering due to discharge or leakage.

  Further, according to this embodiment, since the water supply stopping device 60 has a simple configuration in which the air intake port 62 and the siphon pipe 12 are connected by the ventilation pipe 64, it can be introduced at a low cost. Further, since the water supply stopping device 60 does not require a power supply, there is no possibility that the system will be shut down when necessary due to an unexpected power loss due to a power failure or lightning strike.

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

  In the above-described embodiment, the ventilation pipe 64 is installed so as to be exposed to the outside. However, as in the embodiment shown in FIG. 6, the ventilation pipe 64 is housed in the flexible protection pipe 68. It can also be installed. The protection tube 68 may be provided for the entire length of the ventilation tube 64 or a portion where the ventilation tube 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 for accommodating the ventilation tube 64, the trauma resistance of the ventilation tube 64 is improved, and unnecessary intake of air due to breakage of the ventilation tube 64 is prevented. You. That is, system failure due to breakage of the ventilation pipe 64 is prevented. When a transparent tube is used as the ventilation tube 64, algae due to photosynthesis may be generated in the ventilation tube 64, but by storing the ventilation tube 64 in the opaque protection tube 68, This is prevented.

  Further, in the above-described embodiment, the vent pipe connecting portion 56 for connecting the vent pipe 64 to the siphon pipe 12 is provided at the vent connection joint 22 provided in the embankment top conduit 12b of the siphon pipe 12. The ventilation pipe connecting portion 56 is provided with the ventilation shutoff valve 58. However, the position where the ventilation pipe connecting portion 56 and the ventilation blocking valve 58 are provided is not particularly limited, and can be appropriately changed. However, it is preferable that the position of the ventilation shut-off valve 58 provided in the ventilation pipe 64 is a part that is piped to a flat top portion of the embankment body 100 in consideration of safety of opening and closing work.

  Further, in the above-described embodiment, the air intake port 62 is formed in a cylindrical shape with a top and a bottom, and a plurality of holes 62a are formed on the entire surface thereof. The number and arrangement of the 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. Further, the distal end portion of the ventilation pipe 64 may be used 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 pipe line 12a of the siphon pipe 12, but is not limited to this. For example, a pole may be erected on the water source 102, and the air intake port 62 may be attached to the pole.

  Further, in the above-described embodiment, a flexible pressure-resistant tube is used as the ventilation pipe 64 in order to make the installation height of the air intake port 62 variable, but the ventilation pipe 64 does not necessarily extend over its entire length. It need not be flexible. For example, only the distal end portion of the ventilation pipe 64 on the air intake port 62 side may have flexibility in accordance with the height range in which the installation height of the air intake port 62 is to be changed. The fact that only the tip portion may have flexibility is the same for the protection tube 68. Further, for example, a plurality of holes serving as air intake ports are formed in advance at the end of the ventilation pipe 64 so as to have different height positions, 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.

  Further, in the above-described embodiment, the water supply stop device 60 that stops the water supply by the siphon tube 12 by taking in the air into the siphon tube 12 to break the siphon state is used, but the present invention is not limited to this. For example, an electric valve such as an electric gate valve that can open and close a water passage in the siphon pipe 12 can be used as the water supply stop device. 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 electric valve is actuated to seal the water passage in the siphon pipe 12 so that the water supply by the siphon pipe 12 is performed. Should be automatically stopped.

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

  Further, in the above-described embodiment, in order to start the siphon efficiently, the siphon starting method in which the water supply side pipe 12c of the siphon pipe 12 is first filled with water is adopted. The present invention, which can be appropriately changed and includes a water supply stopping device, can be adopted in various conventional siphon-type water intake systems.

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

DESCRIPTION OF SYMBOLS 10 ... Siphon type water intake system 12,12a, 12b, 12c ... Siphon pipe 14 ... Intake port 16 ... Siphon gate valve 20 ... Intake float 22 ... Venting part connection joint 24 ... Gas capture tank 40 ... Venting device 50 ... Injection pump 58 ... ventilation shutoff valve 60 ... water supply stop device 62 ... air intake 64 ... ventilation pipe 68 ... protection pipe 100 ... embankment 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 bank body,
A siphon pipe extending from the water source to the water supply destination across the embankment body; and a water feed stop device provided on the siphon pipe and stopping water supply by the siphon pipe when the water level of the water source reaches a predetermined water level. e,
The water supply stop device,
An air intake with a variable installation height, and
It has flexibility, and comprises a ventilation pipe connecting the air intake port and the siphon pipe,
The air intake is fixed to an outer peripheral surface of the siphon pipe provided on the water source side at the height position of the predetermined water level,
The siphon-type water intake system , wherein the water-supply stopping device stops the water supply by the siphon pipe by taking in air from the air intake port into the siphon pipe to interrupt a siphon state . A siphon-type water intake system that supplies water to a water supply destination from a water source located across a bank body,
A siphon pipe extending from the water source to the water supply destination across the embankment, and
A water supply stop device is provided on the siphon pipe and stops water supply by the siphon pipe when the water level of the water source reaches a predetermined water level,
The siphon type water intake system , wherein the predetermined water level is a height position of a safety water level which is a target water level at the time of emergency discharge in a disaster or the like . The siphon-type water intake system according to claim 1 or 2 , further comprising: a restarting means capable of restarting a siphon state of the siphon pipe and restarting water intake after stopping water supply by the siphon pipe by the water supply stop device. . A siphon-type water intake system that supplies water to a water supply destination from a water source located across a bank body,
A siphon pipe extending from the water source to the water supply destination across the embankment, and
A water supply stop device is provided on the siphon pipe and stops water supply by the siphon pipe when the water level of the water source reaches a predetermined water level,
The water supply stop device,
An air inlet with a variable installation height, and
A ventilation pipe connecting the air intake port and the siphon pipe,
The water stop device, by creating interrupting the siphon state takes in air in the siphon pipe from the air inlet, the siphon tube water was stopped by, obtain further Bei ventilation shutoff valve provided in said air pipe , support alternative version type water intake system. The siphon-type water intake system according to claim 4 , further comprising a protection tube that houses the ventilation tube. The siphon-type intake system according to claim 4 , wherein the air intake has a plurality of holes.

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