JP2017205073A - Water supply system - Google Patents

Abstract

CONSTITUTION: According to the present invention, a water supply system (10) comprises a water supply pipe (18) installed in a tunnel (16) of a levee body (12). The water of a water source pond (14) is introduced into the water supply pipe through an intake water float (24), an intake hose (22), and a connection conduit (20). The water supply pipe is connected to a water discharge conduit (52) via a connection conduit (50), and supplies water from the water discharge conduit to the field. A plurality of air vent holes (64) is formed in the vicinity of the intake water float of the intake hose at intervals in the axial direction of the intake hose. The air staying in the intake hose is discharged into the atmosphere through the air vent hole, and drained therefrom.EFFECT: By releasing the staying air in the intake hose from the air vent hole, the floated intake hose can be settled to allow water to pass therethrough.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a water supply system, and more particularly to a water supply system and a water supply system that supply water from a water source pond blocked by a bank body to a field on the opposite side of the water source pond across the bank body.

  An example of a conventional water supply system as the background of the present invention is disclosed in Patent Document 1. In this water supply system, water is taken into a siphon pipe portion constituting the water supply pipe through a water intake hose from a water intake float floated on a water source such as a reservoir.

JP2013-204278 [E02B 7/20 A01G 25/00]

  In this water supply system, the water intake hose may come out of the water surface near the water intake float, making it impossible to feed water into the water supply pipe. In other words, since the water intake hose is flexible, when the air stays in the hose, the stayed part floats up and jumps out of the water surface, shuts off the water supply from the water intake and cannot take in water.

  If the water intake hose has surfaced, it must be pushed down below the surface of the water, or the water intake float must be lifted to discharge the air from the water intake and sink the water intake hose. In order to push the surfacing intake hose below the surface of the water, it is necessary to carry out by two boats, four workers or more or two divers. In order to lift the intake float, it is necessary to prepare a crane vehicle such as a UNIC vehicle and carefully lift the intake float from the water surface.

  In any case, when such a water intake hose levitation accident occurs, it takes a lot of personnel, equipment, and time.

  Therefore, the main object of the present invention is to provide a novel water supply system.

  Another object of the present invention is to provide a water supply system that can prevent the intake hose from floating as much as possible.

  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.

  1st invention is a water supply system which supplies the water of the water source pond blocked by the bank body to the farm field on the opposite side to the water source pond across the bank body, floated on the water source pond, Float that takes water from the water source pond from the water, a water intake hose that is connected to the float and the water that is taken into the float is fed into the water source pond, and a water intake hose that is connected to the base end of the water intake hose in the water source pond. The water intake hose is a water supply system that includes an air vent formed to vent air therein.

In the first invention, the water supply system (10: reference numerals exemplifying corresponding parts in the embodiment; the same applies hereinafter) is used to store the water stored in the water source (14) such as a reservoir, and the water source Supply to the field on the opposite side across the dam body (12) to be dammed. A water intake float (24) is floated on the surface of the water source while being moored by mooring ropes (28, 30). The intake float takes water from the source and sends it to the intake hose (22) connected to the intake float. Water supply pipes (18, 50) connected to the intake hose guide water from the intake hose to the field. For example, on the upstream side of the intake hose, an air vent (64) is formed for extracting the air in the intake hose by, for example, releasing it into the atmosphere. When the water intake hose is completely lifted from the water surface (66) of the water source, the air staying in that portion is released into the atmosphere through the air vent. Therefore, the water intake hose sinks, and eventually the water surface inside the water intake hose becomes the same level as the water surface of the water source, and the water can be passed through the water intake hose. Even when the air stays inside and rises from the water surface of the water source, the air can be discharged from the air vent and the intake hose can be passed through. Therefore, it is possible to save many personnel, equipment, and time that were necessary in the past.

  2nd invention is a water supply system which depends on 1st invention, and an air vent part is formed in the front end side rather than the middle between the front-end | tip and base end of a water intake hose.

  In 2nd invention, an air vent part is formed in the upstream (front end side) from the middle of a water intake hose. For example, if the intake hose has a length of 10 m, it is formed in the upstream half (5 m). The reason why the water intake hose floats and cannot be taken is because the upstream side of the water intake hose has floated.

  In the second aspect of the invention, it is possible to eliminate as soon as possible the inability to take water due to the floating of the water intake hose.

  3rd invention is a water supply system which depends on 1st or 2nd invention, and an air vent part contains the several air vent hole formed in the water intake hose at intervals in the pipe-axis direction of the water intake hose. .

  In 3rd invention, an air vent part contains the several air vent hole (64) formed at intervals in the pipe-axis direction of the water intake hose. Since the plurality of air vent holes are formed by dispersing the air vent holes over a certain range in the tube axis direction, air can be extracted from a wide range in the water intake hose.

  According to the third aspect of the invention, air can be released even from one of the plurality of air vent holes, so that the air in the water intake hose can be efficiently extracted.

  A fourth invention is a water supply system according to the third invention, further comprising a plurality of sheets provided on the outer surface of the water intake hose and blocking corresponding ones of the plurality of air vent holes from the outer surface.

  In the fourth aspect of the invention, since the sheet covers the air vent hole from the outer surface of the water hose, the air in the water intake hose is exhausted from the air vent hole, but the sheet can act as a valve to block the reverse flow from the water source pond.

  According to 4th invention, it can prevent backflow in a water intake hose from a water source pond with a sheet | seat.

  A fifth invention is dependent on any one of the first to fourth inventions, and the water supply pipe includes a water supply pipe passing under the dam body and a connecting pipe portion connected to the water supply pipe outside the dam body. Water is supplied to the field through a gate valve provided in the connection pipe part, and further includes a pressurized water injection part formed in the water supply pipe upstream of the gate valve.

  In the fifth aspect of the invention, the water supply pipe is connected to the water supply pipe (18) extending below the bank body (12) to the outside of the bank body and the connection pipe line (50) connecting the water supply pipe and the water discharge pipe (52). The water is supplied to the field from the water discharge pipe through the gate valve (61) provided in the connection pipe. When the pressurized water injection part (70, 72) is formed in the connecting pipe line upstream from the gate valve, when water is injected under pressure from this pressurized water injection part, the staying air in the intake hose moves upstream, The air can be discharged from the air vent (64).

  According to the fifth aspect of the invention, when the water is pressurized and injected from the pressure injection part, the staying air in the water intake hose moves, so that the air can be reliably released from the air release part.

  6th invention floats in a water source pond in order to supply the water of a water source pond blocked by a bank body to the field on the opposite side to a water source pond across the bank body, Float that takes in water, a water intake hose that has a tip connected to the float and that feeds water taken into the float, and a water supply that is connected to the proximal end of the water intake hose in the water source pond and leads the water taken by the water intake hose to the field In a water supply system having a pipe line, a method of sinking a floating intake hose below the surface of a water source pond, wherein the intake hose is submerged by releasing air from an air vent formed in the intake hose. It is a method of sinking.

  In the sixth invention, when air stays in the intake hose (22) in the vicinity of the air vent (64) and the intake hose has completely lifted from the water surface (66) of the water source (14), The air staying in the part is released into the atmosphere through the air vent. Therefore, the water intake hose settles, and the water surface inside the water intake hose eventually becomes the same level as the water surface of the water source, so that water can pass through the water intake hose.

  In the sixth invention, the same effect as in the first invention can be expected.

  A seventh invention is a method according to the sixth invention, in which the intake air in the intake hose is moved to the air vent by injecting water under pressure from the downstream side of the water supply pipe, and the intake hose is sunk. .

  In the seventh invention, the water supply line of the water supply system is connected to, for example, a water supply line (18) extending below the dam body (12) to the outside of the dam body, and connecting the water supply line and the water discharge line (52). Water is supplied to the field from the water discharge pipe through the gate valve (61) provided in the connection pipe including the pipe (50). When the pressurized water injection part (62, 72) is formed in the connecting pipe line upstream from the gate valve and water is injected under pressure from this pressurized water injection part, the staying air in the intake hose moves upstream, The air can be discharged from the air vent (64).

  According to the seventh aspect, the water intake hose can be efficiently sunk.

  In the eighth invention, in order to supply the water from the water source pond blocked by the bank body to the farm field on the opposite side of the water source pond across the bank body, the water source pond is floated on the water source pond. Float that takes in water, a water intake hose that has a tip connected to the float and that feeds water taken into the float, and a water supply that is connected to the proximal end of the water intake hose in the water source pond and leads the water taken by the water intake hose to the field The water supply line includes a water supply line that passes under the dam body and a connection pipe part that is connected to the water supply line outside the dam body, and water is supplied to the field through a gate valve provided in the connection pipe part. In the water supply system, the intake hose that has floated is submerged under the surface of the water source pond, and the intake hose is submerged by pressurized water injection in the connecting pipe upstream of the gate valve. This is a method of sinking the hose.

  In the eighth invention, for example, the pressurized water injection section (62, 72) provided in the connection pipe (50) pushes the air reservoir in the intake hose (22) upstream and carries it to the tip of the intake hose. it can. Then, air is discharged into the atmosphere through the intake hose and the intake float. Therefore, the amount of air in the water intake hose decreases, the water intake hose settles, and it becomes possible to pass water before long.

  According to the eighth invention, the water intake hose can be efficiently sunk.

  According to this invention, since the air vent part is provided in the water intake hose, the air staying in the water intake hose is discharged therefrom, and therefore the water intake hose can be prevented from rising. Therefore, the situation that the water intake hose rises and water cannot be taken can be eliminated without requiring a lot of personnel, equipment, and time.

  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.

FIG. 1 is a schematic view of a water supply system according to one embodiment of the present invention as viewed from the side, FIG. 1 (A) shows an upstream side, and FIG. 1 (B) shows a downstream side. FIG. 2 is a schematic view of a water supply system according to an embodiment of the present invention as viewed from above. FIG. 2 (A) shows the upstream side, and FIG. 2 (B) shows the downstream side. 3 is an enlarged schematic view showing a water intake portion in the water supply system of the embodiment of FIGS. 1 and 2, FIG. 3 (A) is a view from above, and FIG. 3 (B) is a view from the side. It is a figure. FIG. 4 is a schematic view showing an example of the action of the air vent hole in the embodiment, FIG. 4 (A) shows a state where the intake hose is floating, and FIG. 4 (B) shows a state where the intake hose is slightly submerged. FIG. 4 (C) shows a state in which the water intake hose sinks and water can be passed. FIG. 5 is a schematic view showing another example of the action of the air vent hole in the embodiment, and shows a state in which the water intake hose is floating as in FIG. FIG. 6 is a schematic view showing a modification of the air vent hole of the water intake hose. FIG. 7 is a schematic view showing another modification of the air vent hole of the water intake hose. FIG. 8 is a schematic view showing a modification of the pressurized water injection unit.

  Referring to FIGS. 1 and 2, a water intake system 10 according to an embodiment of the present invention is a facility for supplying water to a farm field (not shown) from a water source pond 14 dammed up by a bank body 12. Specifically, the water from the water source pond 14 is discharged into a water discharge pit (not shown) provided in the field by using a culvert 16 formed by a fume pipe, for example, in the basement of the dam body 12. )

  In addition, when the water source pond 14 is provided, the tunnel 16 is always made in the dam body 12. In this embodiment, since the existing tunnel 16 is used, the construction cost is reduced. Can be suppressed. In addition, although the nominal diameter of the fume pipe | tube which forms the canal 16 is 600-800 as an example, it is not limited to this.

  In the water intake system 10 of the embodiment, a water supply pipe 18 is laid in the culvert 16 by, for example, butt joining (butt fusion) of PE (polyethylene) pipes. The nominal diameter of the water supply pipe 18 is 200-250 as an example, but is not limited thereto.

  Although the method for laying the water supply pipe 18 in the tunnel 16 is not described in detail, a so-called “pipe-in-pipe method” is adopted. Therefore, there is no need for large-scale renovation work of the dam body 12 and the culvert 16 and it can be installed relatively inexpensively.

  In addition, when making a water source new, you may make it construct the water supply pipe line 18 separately from a raft. In that case, the water supply pipe is devised so as to block the levee body or endure the earth pressure, for example, by hardening the periphery with concrete.

  A water intake hose 22 is connected to the inlet side of the water supply pipe 18 through a connection pipe 20. The water intake hose 22 is a flexible straight pipe made of soft vinyl chloride as an example, and its tip is connected to the water intake float 24. The connecting pipe 20 is fixedly locked to the bottom of the water source pond 14 by a fixing base 26 formed of, for example, concrete near the base of the bank body 12 on the water source pond 14 side. However, the water intake hose 22 may be composed of a flexible tube such as a bellows tube.

  Although not shown in detail, a penetration portion between the inlet end of the water supply pipe 18 connected to the connection pipe 20 and the upstream concrete structure of the tunnel 16 is sealed with, for example, concrete. Similarly, the through-hole between the outlet end of the water supply pipe 18 and the downstream concrete structure of the tunnel 16 is also sealed with concrete, for example. That is, the water supply pipe 18 is a so-called “rolling pipe” in the tunnel 16 and only both ends thereof are fixed by the concrete structure. Therefore, coupled with the fact that the water supply pipe 18 is a PE pipe, it can easily cope with expansion and contraction due to a temperature difference.

  The above-described intake float 24 is for taking in surface water having a relatively high temperature, and moves up and down as the intake hose 22 bends as the water level changes. However, the intake float 24 is moored by the mooring ropes 28 and 30 in order to prevent the intake float 24 from swinging more than necessary. The base end of the mooring rope 28 is locked to a mooring pole 34 supported by a base 32 fixed in the water source pond 14, and the base end of the mooring rope 30 is supported by a base 36 fixed on the dam body 12. The support tool 38 is locked.

  As can be clearly understood from FIG. 3, the intake float 24 is composed of two upper and lower members, and the upper float portion 40 is composed of two large and small hollow sealed pipes having a rectangular planar shape, and imparts buoyancy to the intake float 24. On the lower side of the float portion 40, a water intake portion 42 having a planar shape formed in, for example, a “ten” shape is attached. A large number of water intake ports 44 are dispersedly formed on both sides of each side of the water intake portion 42. Therefore, the water intake section 42 takes water from each water intake 44 and feeds the water into the water hose 22.

  More specifically, a rectangular box-shaped water receiving portion 46 is attached to the tip of the water intake hose 22, and the water receiving portion 46 is fixed to a water supply portion 48 formed at the center of the water intake portion 42. Therefore, the water receiving portion 46 and the water feeding portion are connected so that the water feeding port (not shown) formed on the bottom surface of the water feeding portion 48 and the water receiving port (not shown) formed on the top surface of the water receiving portion 46 communicate with each other. The water 48 is joined and the water taken in by the water intake section 42 is sent to the water intake hose 22 through the water inlet and the water inlet.

  Thus, the water in the water source 14 taken into the water intake hose 22 enters the water supply pipe 18 in the tunnel 16. The water supply pipe 18 is connected to a water discharge pipe 52 that discharges water to a farm field (not shown) via a connection pipe 50. It should be noted that water is supplied to the water discharge line 52 via the connection line 50, so that “water supply line” may refer to both the water supply line 18 and the connection line 50.

  Although not shown in detail in the connection pipe 50 connected to the water supply pipe 18, an exhaust valve device 54 is provided. The exhaust valve device 54 discharges air that has entered from the field side, and blocks the floating of the air upstream. The details are described in detail in the co-pending Japanese Patent Application No. 2016-93670 relating to the application of the applicant of the present application, and the detailed description is omitted here by using the description.

  Since it is not clear in FIG. 1 and FIG. 2, here, the exhaust valve apparatus 54 is demonstrated easily with reference to FIG. 8 for convenience. The exhaust valve device 54 has a tank 56, and two exhaust valves 60 that are opened and closed by the vertical movement of the float 58 are formed at the upper end of the tank 56. However, in this embodiment, a valve body such as a rubber packing fixed to the upper end of the float 58 and a valve seat in which the valve body contacts and separates according to the vertical movement of the float 58 are included. Therefore, when air is mixed in the water stored in the tank 56 and the water level is lowered, the float 58 is lowered, the exhaust valve 60 is opened, and the air released from the water in the tank 56 is discharged to the exhaust valve 60. To the atmosphere. Further, when the water supply from the water supply pipe 18, that is, the connection pipe 50 is reduced or interrupted, the water outflow from the tank 56 stops when the water level in the tank 56 falls below the outflow side.

  Further, since the inflow side from the connection pipe 50 in the tank 56 of the exhaust valve device 54 is lower than the outflow side to the water discharge pipe 52, even if the water level in the tank 56 becomes lower than the outflow side, the inflow side Since it is still below the water level in the tank 56, a trap with the inflow side blocked is formed. Therefore, air does not flow back through the water supply pipe 18.

  A gate valve 61 is provided slightly upstream of the exhaust valve device 54 in the connection pipe 50, and a pressurized water injection unit 62 is disposed further upstream. The pressurized water injection part 62 is used for injecting water into the connecting pipe 50, that is, the water supply pipe 18, and the action thereof is an air vent hole 64 (formed on the pipe top of the water intake hose 22 ( This will be described later together with the operation of FIG.

  In addition, the pressurized water injection part 62 is inserted in the connection pipe line 50 by, for example, a flange joint, and, for example, a pressure pump (not shown) is connected to a pipe end that has passed through a gate valve or a check valve, for example. Pressurized water is injected into the connecting pipe 50.

  As shown in FIG. 3, a plurality of (five in the embodiment) air vent holes 64 penetrating the pipe wall of the water intake hose 22 are formed at the top of the pipe near the water intake float 24 of the water intake hose 22. As an example, in this embodiment, the length of the water intake float 24 (horizontal direction or length in FIG. 3) is 3.6 m, and the water supply part 48 is the center thereof. .8m. And the five air vent holes 64 are formed in the range of 2-4 m from the water supply part 48 of the water intake float 24 at intervals of 0.5 m. That is, in this embodiment, the air vent holes 64 are formed at positions 2.0 m, 2.5 m, 3.0 m, 3.5 m, and 4.0 m from the water supply section 48.

  However, the size (diameter) of the hole 64 is about 1 mm as an example. If the size of the air vent hole 64 is made too large, the same inconvenience occurs even if the number of air vent holes 64 is excessively increased. On the other hand, if the distance between the air vent holes 64 is made too small and the air vent holes 64 are densely packed, not only does the strength of the water intake hose 22 decrease in the density, but air is vented from the air vent holes 64. There is a concern that the axial length of the water intake hose 22 can be shortened and cannot sufficiently cope with a wide range of air retention. Therefore, the inventor determined the specifications as described above through experiments. However, these numerical values are only examples, and it is needless to say that the present invention is not limited as it is.

  As described above, there is a problem that the water intake hose 22 rises and water supply cannot be performed. However, in the current water supply system, in order to prevent the water intake hose 22 from rising when the water in the water source (reservoir) is stored, Although water is discharged by injecting water into the intake hose 22 and the water supply pipe 18 in advance, exhausting is not sufficiently performed, and the intake hose 22 floats. In addition, depending on the reservoir, the pond may be drowned or drought may occur. In this case, water supply to the intake hose 22 and the water supply pipe 18 is not performed, and storage of water in the reservoir begins. The water intake hose 22 may float up.

  The current intake hose 22 is flexible enough to follow the movement of the intake float 24, but the process of moving the accumulated air upstream of the intake hose (from the pond bottom to the intake float 24 side). Thus, the water intake hose 22 is lifted and a part of the hose is pushed and bent on the water surface 66 to be floated. The state is shown in FIG.

  In the state of FIG. 4A, air stays in the vicinity of the air vent hole 64, and the water intake hose 22 is completely lifted from the water surface 66 of the water source. However, in this embodiment, there is an air vent hole 64 at the location of the water intake hose 22 that has been lifted. Therefore, the air staying in the floating part is released into the atmosphere through one or more air vent holes 64. Therefore, the water intake hose 22 slightly sinks as shown in FIG.

  Thereafter, air is further released from the air vent hole 64 of the water intake hose 22, and the water intake hose 22 further sinks. Then, as shown in FIG. 4C, the water level inside the water intake hose 22 becomes the same level as the water surface 66 of the water source 14, and water can pass through the water intake hose 22. In the state of FIG. 4 (C), since water is sent into the intake hose 22 thereafter, air is pushed away by the water flow, and the intake hose 22 sinks below the water surface 66 of the water source 14 and normal water supply It becomes a state.

  In addition, as shown in FIG. 5, when the area | region where the air stays in the intake hose 22 exists in the downstream from the air vent hole 64, unlike the case shown in FIG. The air will not escape. Therefore, in this embodiment, a water injection pump (not shown) is connected to the pressurized water injection unit 62 shown in FIGS. 1 and 2, and water is supplied from the water injection pump to the intake hose 22 through the connection line 50. inject. By injecting and pressurizing water from the downstream side of the water intake hose 22, the air pool retained in the water intake hose 22 moves to the upstream side of the water intake hose 22 having the air vent hole 64, for example, as shown in FIG. Thus, exhaust from the air vent hole 64 becomes possible. Thereafter, even if the water injection is stopped, the water can be finally passed as shown in FIG. 4 (B) and FIG. 4 (C). However, the necessary water in addition to the pressurized water injection at this time is preferably obtained not from the water source pond 14 but from an agricultural field (not shown).

  Thus, if it is a water supply system which can perform pressurized water injection from the downstream side of the intake hose 22 by the pressurized water injection part 62 using a water injection pump, the air vent hole 64 may become unnecessary.

  That is, as described above, if the air reservoir in the water intake hose 22 can be pushed up by the pressurized water injection section, the air reservoir can be carried to the position of the water receiving section 46 at the tip of the water hose 22. Then, air is discharged from the water intake port 44 through the water supply port, through the water supply unit 48 of the water intake unit 42, to the atmosphere. Therefore, the amount of air in the intake hose 22 is reduced, and eventually the water can be passed as shown in FIG. 4C, that is, the water surface in the intake hose 22 becomes the same level as the water surface 66 of the water source 14. That is, even if there is no air vent hole 64, the intake water hose 22 can be lifted by the retained air in the water intake hose 22 and the inability to take water can be eliminated only by the pressurized water injection part.

  In addition, even if there is no water injection by the pressurized water injection part 62, that is, only the air vent hole 64 is formed, the water intake hose 22 is lifted by the accumulated air in the water intake hose 22 and the inability to take water can be eliminated. As described with reference to FIG.

  FIG. 6 is a schematic view showing another example of the air vent part, and an air vent hole 64 similar to that in FIG. 3A is formed in the water intake hose 22 and is made of a soft resin so as to cover the air vent hole 64 from the outside. The sheets 68 are attached to the corresponding air vent holes 64. For example, the sheet 68 is a rectangle having an appropriate size, and one side (the upper side in FIG. 6) is bonded to the water hose 22. Then, the sheet 68 is supported on one side thereof and opens and closes the air vent hole 62. Then, the air in the water intake hose 22 is exhausted from the air vent hole 64, but the backflow of the water in the water source pond 14 (FIGS. 1 and 2) and the backflow of air from the atmosphere are blocked by the seat 68 as a valve. it can.

  FIG. 7 is a schematic view showing still another example of the air vent, and the air vent hole 64 is formed by, for example, a cross cut through the pipe wall of the water intake hose 22. When the air vent hole 64 is formed by such a cut, the air in the water intake hose 22 is exhausted from the air vent hole 64 as in the sheet 68 of the embodiment of FIG. The backflow of air can be blocked by the piece formed by the notch acting as a valve.

  In the embodiment shown in FIG. 1 and FIG. 2, a pressurized water injection part 62 is provided in the connection pipe 50, and a pump, for example, is connected thereto to function as a pressure water injection part. However, the pressurized water injection section 62 can be modified as in the embodiment of FIG. That is. A hose 72 may be connected to the connection line 50 using a three-way joint 70, a gate valve or a check valve may be inserted into the hose 72, and the end of the pipe may be used as a pressurized water inlet. In that case, a water injection pump (not shown) is connected to the pressurized water inlet, and pressurized water is injected from the hose 72. In the embodiment of FIG. 8, the hose 72 having an appropriate length can be routed to an appropriate position, so that the pressurized water inlet can be installed at an arbitrary place. Moreover, if the pressurized water inlet is extended to a drainage channel (not shown), it can also be used as a mud drainage channel when not used as a pressurized water inlet. However, when it uses as a mud drain pipe, the valve inserted in the hose 72 is a gate valve.

  In the above-described embodiment, the water supply pipe 18 is configured as a conduit inside the tunnel, but the present invention can also be used in a water supply system using a siphon pipe as in Patent Document 1. In that case, the water intake hose 22 is connected to the siphon conduit at the base end in the water source pond 14. And the air vent hole 64 (FIG. 3, FIG. 6, FIG. 7) mentioned above is formed in the predetermined position of a water intake hose. Therefore, when the intake hose floats from the water surface of the water source 14 due to stagnant air and water can no longer be taken, if the air is removed from the air vent hole as described above, the intake hose can pass water. become.

  In addition, when a siphon conduit is used, the siphon water inlet can be used as a pressurized water inlet. However, the siphon inlet is a portion for injecting water in order to first place the siphon conduit in the siphon state.

  Note that the specific numerical values such as the specific materials and dimensions mentioned above are merely examples, and can be appropriately changed according to the needs of the product specifications and the like.

DESCRIPTION OF SYMBOLS 10 ... Water supply system 12 ... Dam body 14 ... Water source pond 16 ... Passage 18 ... Water supply pipe 22 ... Water intake hose 24 ... Water intake float 62 ... Pressurization water injection part 64 ... Air vent hole 66 ... Water surface 68 ... Sheet 72 ... Hose (pressure injection) Aquatic)

Claims (8)

A water supply system for supplying water from a water source pond blocked by a bank body to a farm field on the opposite side of the water source pond across the bank body,
A float that floats on the water source pond and takes in water from the water source pond from a water intake;
A water intake hose having a tip connected to the float and fed with water taken into the float, and a water supply connected to a base end of the water intake hose in the water source pond and guiding the water taken by the water intake hose to the field With a pipeline,
The water intake hose includes an air vent formed to vent air therein.   The water supply system according to claim 1, wherein the air vent is formed closer to the distal end than an intermediate between the distal end and the proximal end of the water intake hose.   The water supply system according to claim 1 or 2, wherein the air vent part includes a plurality of air vent holes formed in the water intake hose at intervals in a tube axis direction of the water intake hose.   The water supply system according to claim 3, further comprising a plurality of sheets provided on an outer surface of the water intake hose and blocking corresponding ones of the plurality of air vent holes from the outer surface. The water supply pipe includes a water supply pipe passing under the dam body and a connection pipe connected to the water supply pipe outside the dam body, and the water passes through a gate valve provided in the connection pipe. The water supply system in any one of Claims 1 thru | or 4 provided with the pressurized water injection | pouring part formed in the said connecting pipe part upstream from the said sluice valve which is supplied with water to the said agricultural field. In order to supply the water of the water source pond blocked by the dam body to the farm field on the opposite side of the water source pond across the dam body, it is floated on the water source pond, and the water of the water source pond is taken from the intake section. A float to be taken in, a water intake hose whose tip is connected to the float to feed water taken into the float, and a water intake hose connected to a base end of the water intake hose in the water source pond, In a water supply system including a water supply pipe that leads to a water supply line, a method of sinking the floating intake hose below the surface of the water source pond,
A method of sinking an intake hose, wherein the intake hose is sunk by releasing air from an air vent formed in the intake hose.   The method for sinking a water intake hose according to claim 6, wherein the stagnant air in the water intake hose is moved to the air vent by injecting water from the downstream side of the water supply pipe. In order to supply the water of the water source pond blocked by the dam body to the farm field on the opposite side of the water source pond across the dam body, it is floated on the water source pond, and the water of the water source pond is taken from the intake section. A float to be taken in, a water intake hose whose tip is connected to the float to feed water taken into the float, and a water intake hose connected to a base end of the water intake hose in the water source pond, The water supply pipe includes a water supply pipe passing under the bank body and a connection pipe connected to the water pipe outside the bank body, wherein the water is the connection pipe part. In the water supply system in which water is supplied to the field through a gate valve provided in the method, the floating intake hose is submerged below the surface of the water source pond,
A method of sinking a water intake hose, wherein the water intake hose is sunk by pressurized water injection in the connecting pipe portion upstream of the gate valve.

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