JP2016067339A - Water intake system - Google Patents

Abstract

CONSTITUTION: In a water intake system (10), an internal conduit (22) is laid in an underground tunnel (18) of a dam body (12), and water of a pool (14) is allowed to pass through an intake float (28), an intake hose (26), and a connection conduit (24) to be introduced to the internal conduit (22) in the tunnel. To an exit of the internal conduit (22) in the tunnel, a discharge conduit (44) is connected. A gate valve (58) is provided to the discharge conduit (44), and to a position higher than the gate valve (58), a discharge port (48) is formed via an inclined part (60). When the gate valve (58) is opened, water of the pool (14) flows into the internal conduit (22) in the tunnel, and through the discharge conduit (44), is discharged into a water-discharge pit (20) from the discharge port (48). When the gate valve (58) is closed, sealing water is formed between the discharge port (48) and the gate valve (58).EFFECT: According to the present invention, provided is a water intake system which has a simpler structure than that of siphon-type system, facilitates management, and further can prevent air contamination by sealing water.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a water intake system, and more particularly to, for example, a novel water intake system that supplies water from a reservoir pond as a water source to a water discharge pit in a field through a tunnel under a bank.

  An example of a conventional water intake system which is the background of the present invention is disclosed in Patent Document 1. The water intake system disclosed in Patent Document 1 is a siphon type.

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

  Although the siphon intake system has the advantage of being safer than the system that opens and closes the tilt shaft, the main parts such as the siphon pipe, water injection pump, check valve or vacuum pump are expensive and maintenance is required. Is necessary and management is troublesome.

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

  Another object of the present invention is to provide a water intake system that is inexpensive and easy to manage.

  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 intake system which discharges the water from a reservoir pond to the pit of a farm field through the culvert under the embankment, has a discharge port, and receives the water passing through the culvert and discharges the discharge port. A discharge pipe that discharges water from the pit to the pit, and an on-off valve provided in the discharge pipe, and the discharge pipe includes a sealing portion provided so that the discharge port is higher than the pipe height of the on-off valve. System.

In the first invention, the water intake system (10: reference numerals exemplifying corresponding parts in the embodiment; the same applies hereinafter) receives the water taken from the reservoir (14) blocked by the dam body (12). This is a system that discharges to a pit (open channel) (20) of a farm field (16).
The dam body (12) of the reservoir pond (14) is usually provided with a tunnel (18), and in the present invention, this existing tunnel (18) is used. That is, the discharge pipe (44) receives water that has passed through the tunnel (18). The discharge pipe (44) is provided with an on-off valve (58). When the on-off valve (58) is opened, water that has flowed into the discharge pipe (44) passes through the discharge port (48) to the pit (20 ). However, the discharge pipe (44) is provided with a water seal (60) such that the discharge port (48) is higher than the pipe height of the on-off valve (58). When the on-off valve (58) is closed, sealed water is formed in the water-sealing part (60) between the discharge port (48) and the on-off valve (58). Therefore, air does not enter the discharge pipe (44) from the discharge port (48).

  According to the first invention, since the structure is simple and the number of parts is small, it can be installed at low cost and is easy to manage. And since air does not mix into the discharge pipe line from the discharge port, air does not flow backward through the inside of the tunnel. Therefore, the intake hose can be prevented from floating (air accumulation), and the amount of water intake can be prevented from being reduced due to the hose cross-section reduction.

  2nd invention is dependent on 1st invention, and a water-sealing part is a water intake system containing the inclination part in which the discharge pipe was inclined.

  In 2nd invention, a sealing part (60) and an inclination part (60) are included.

  According to the second aspect of the invention, since the sealing part can be formed only by inclining the discharge pipe, a special part for the sealing part is unnecessary.

  A third invention is a water intake system according to the second invention, wherein the inclined portion is inclined at an angle of 45 ° or less.

  In 3rd invention, an inclination part (60) is formed by piping, for example in S bend shape of 45 degrees or less.

  According to the third aspect of the invention, since the inclined portion has a gentle inclination of 45 ° or less, even when mud or the like is mixed in the discharge pipe, the contaminants are discharged beyond the inclined portion by the force of the water flow. It can be discharged from the outlet.

  The fourth invention is dependent on any one of the first to third inventions, and further includes a conduit inside the tunnel that is laid in the tunnel and allows water from the reservoir to pass therethrough, and the inlet of the discharge pipeline is the inner pipe of the tunnel A water intake system connected to the exit of the road.

  In the fourth aspect of the present invention, the inner pipe line (22) is laid in the tunnel (18), and the discharge pipe (44) is connected to the inner pipe line (22). That is, the water that has flowed down through the inner conduit (22) is introduced into the discharge conduit (44).

  According to the fourth aspect of the present invention, since the conduit in the tunnel is laid and water is sent from the pipeline in the tunnel to the discharge pipeline, the tunnel can be easily reused when necessary.

  A fifth invention is a water intake system according to the fourth invention, in which the conduit in the tunnel has a polyethylene pipe.

  In the fifth invention, the conduit in the tunnel is laid by, for example, butt fusion of a polyethylene (PE) pipe.

  According to the fifth invention, since the PE pipe is used, it can easily cope with expansion and contraction due to temperature change of water.

  According to this invention, the water in the reservoir is guided to the discharge pipe through the inside of the tunnel, and only the on-off valve is provided in the discharge pipe. Therefore, the main device is less than the siphon type, and the installation cost can be reduced. Management becomes easy.

  In addition, since air can be prevented from being mixed in from the discharge pipe side, the hose can be prevented from floating (air pool), and a reduction in water intake can be prevented.

  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 showing a cross-sectional structure of a water intake system according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a planar structure of the water intake system of FIG. 1 embodiment. FIG. 3 is a schematic view showing a cross-sectional structure of the discharge pipe in the embodiment shown in FIGS. FIG. 4 is a schematic diagram illustrating a first step of an example of a method for laying a conduit in a tunnel in the embodiment. FIG. 5 is a schematic diagram showing a second step of an example of a method for laying a conduit in a tunnel in the embodiment. FIG. 6 is a schematic view showing the main part of another embodiment of the present invention.

  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 field 16 from a reservoir 14 that is blocked by a bank body 12. Specifically, water from the reservoir pond 14 is discharged into a water discharge pit (open channel) 20 provided in the field 16 by using a tunnel 18 formed by a fume pipe, for example, in the basement of the dam body 12. Discharge).

  Incidentally, the tunnel 18 is always made in the dam body 12 when the reservoir pond 14 is provided, and in this embodiment, since the existing tunnel 18 is used, the construction cost is reduced. Can be suppressed. In addition, although the nominal diameter of the fume pipe | tube which forms the tunnel 18 is 600-800 as an example, it is not limited to this.

  In the water intake system 10 of the embodiment, a conduit 22 in the canal is laid in the canal 18 by, for example, butt joining (butt fusion) of PE (polyethylene) pipes. The nominal diameter of the inner duct 22 is 200-250 as an example, but is not limited thereto.

  As will be described later, a method of laying the inner conduit 22 in the tunnel 18 employs a so-called “pipe-in-pipe method”. Therefore, there is no need for large-scale repair work of the dam body 12 and the culvert 18 and it can be installed at a relatively low cost.

  A water intake hose 26 is connected to the entrance side of the inner conduit 22 through the connecting pipe 24. The water intake hose 26 is a bellows-like flexible pipe as an example, and the tip thereof is connected to a water intake portion (not shown) of the water intake float 28. The connecting pipe 24 is fixedly locked to the bottom of the reservoir 14 by a fixing base 30 formed of, for example, concrete near the base of the bank body 12 on the reservoir 14 side.

  The water intake float 28 is for taking surface water having a relatively high temperature, and moves up and down as the water intake hose 26 bends as the water level fluctuates. Further, the water intake portion of the water intake float 28 has one or more water intakes (not shown), and the water intakes are formed so as not to inhale air during water intake. The water intake float 28 sends water taken from the water intake into a water intake hose 26 connected to the water intake unit. In addition, since the proximal end of the water intake hose 26 is connected to the connection pipe line 24 described above, it does not float in the reservoir 14.

  The intake float 28 is moored by mooring ropes 36 and 42. The base end of the mooring rope 36 is locked to a mooring pole 34 supported by a gantry 32 fixed in the reservoir 14, and the base end of the mooring rope 42 is supported by a gantry 38 fixed on the dam body 12. It is locked to the support 40 made.

  Although not shown in detail, the gap between the inlet end of the inner conduit 22 connected to the connecting conduit 24 and the conduit 18 is sealed with concrete, for example. Similarly, a gap between the outlet end of the inner conduit 22 and the tunnel 18 is sealed with concrete, for example. That is, the inner conduit 22 is a so-called “rolling pipe” in the tunnel 18, and only both ends are fixed by the concrete structure. Therefore, along with the fact that the inner duct 22 is a PE pipe, it can easily cope with expansion and contraction due to the temperature of water.

  A proximal end 46 of the discharge conduit 44 is connected to the outlet end of the inner conduit 22. The discharge pipe 44 is also made of, for example, a PE pipe and is formed in a “U” shape as shown in FIG. 2 in a plan view, and the tip of the pipe 44 faces the water discharge pit 20 as a discharge port 48. Since the cross-sectional structure is difficult to understand in FIG. 1, here, the discharge pipe 44 will be described in detail with reference to FIGS. 2 and 3.

  The discharge pipe 44 is bent upward in FIG. 2 by a bent joint such as a large bent elbow, for example, from a base end 46 connected to the inner duct 22, and further, the first straight part 50, the folded part 52, and A discharge port 48 is formed at the tip through the second straight portion 54.

  The first straight part 50 is provided with an air valve or a gas separation type exhaust valve device 56. The air valve or the gas separation type exhaust valve device 56 removes air mixed in the discharge pipe 44 and prevents the air from flowing backward from the discharge pipe 44 to the inner conduit 22 or eventually the intake hose 26.

  A gate valve 58 is provided in the second linear portion 54. The gate valve 58 opens and closes the discharge pipe 44 to switch between water flow and water blocking to the discharge port 48, and may be replaced with another open / close valve such as a butterfly valve.

  In this embodiment, as can be seen from FIG. 3 in particular, an inclined portion 60 inclined so as to rise toward the discharge port 48 is formed between the gate valve 58 and the discharge port 48. The inclined portion 60 is formed by piping, for example, in an S bend shape of 45 ° or less. The inclined portion 60 is a sealing portion formed to dispose the discharge port 48 at a high level with respect to the gate valve 58 so that a water seal can be formed between the discharge port 48 and the gate valve 58. That is, the sealing portion is formed by providing the discharge port 48 so as to act more than the pipe line height of the gate valve 58. When the gate valve 58 is closed, water remains between the discharge port 48 and the gate valve 58, and the gate valve 58 is lower than the discharge port 48. It will not leave 48 and will remain. This residual water forms a sealed water between the discharge port 48 and the gate valve 58. And by forming the sealing water in the inclined portion 60, it is possible to prevent air from being mixed into the discharge pipe 44 from the discharge port 48.

  In addition, since the sealing part is formed by the inclined part 60 in this way and the inflow of air from the discharge port 48 is prevented, the air valve or the gas separation type exhaust provided in the first straight part 50 described above is used. Although the valve device 56 may not be necessary, by providing a sealed water and providing an air valve or a gas separation type exhaust valve device 56, air can be more reliably supplied from the discharge conduit 44 to the inner conduit 22 and the intake hose. 26 can be prevented from entering.

  The reason why the inclined portion 60 for forming the sealed water portion is a gentle inclination of 45 ° or less is that even if mud or pebbles are mixed in the discharge pipe 44, if the inclination is gentle, This is because these contaminants can be discharged from the discharge port 48 beyond the inclined portion 60 by the force of the water flow. This is because, for example, when a steep inclination such as 90 ° is used, it is difficult to discharge such contaminants from the discharge port 48. Therefore, in the embodiment, the angle of the inclined portion 60 is set to 45 ° or less. However, it may be larger than 45 ° as long as the contaminants can be discharged. Further, if the mud and the pebbles are prevented from being mixed, or if a mud reservoir for removing these is installed, a sealing part may be provided so as to stand up vertically.

  In such a water intake system 10, since no valve is provided in the water intake float 28, the water intake float 28 can always suck the surface water of the reservoir 14. Therefore, when the gate valve 58 is opened, according to the water level difference (head difference) between the intake water float 28 and the discharge port 48, the water in the reservoir pond 14 passes through the intake water float 28 and the intake hose 26 and is connected from the connecting conduit 24 to the inner pipe of the tunnel. The water flows into the passage 22 and is discharged from the discharge port 48 into the water discharge pit 20 through the discharge pipe 44.

  In this embodiment, since water is discharged into an open channel such as the water discharge pit 20, the water can be taken only by natural flow unlike the case of supplying water to the pipeline. That is, a forced flow-down means such as a siphon type pump is not necessary, is inexpensive, has little fear of failure, and is easy to manage.

  When the gate valve 58 is closed, the above-mentioned sealed water is formed between the discharge port 48, and on the other hand, the water intake hose 26, the inner conduit 22 and the discharge conduit 44 are filled with water, Will be stopped.

  In addition, the conduit 22 in the tunnel can be laid in the tunnel 18 in the procedure as shown in FIGS. 4 and 5. However, in FIGS. 4 and 5, the dam body 12 and the like are schematically shown unlike FIGS. 1 and 2. Then, the inner conduit 22 is laid before installing the water discharge pit 20, the connecting conduit 24, and the discharge conduit 44 shown in FIGS. 1 and 2.

  For example, by excavation, a start shaft 62 is formed on the inlet side (the reservoir pond 14 side) of the shaft 18 below the dam body 12, and a reaching shaft 64 is formed on the outlet side (the water discharge pit 20 side). Then, as shown in FIG. 4, a line instrument 66 is installed in the start shaft 62, and a line 68 is inserted into the tunnel 18 from there. When the line 68 goes out to the reach shaft 64, the lead-in wire 70 is connected to the line 68. And until the connected drawing wire 70 comes out to the start shaft 62 side, the wire 68 is rewound and drawn. The wiring device 66 is removed.

  Thereafter, as shown in FIG. 5, for example, using a truck with a crane (not shown), a fixed-size PE pipe 72 is carried into the start shaft 62, and is passed to the lead-in wire 70 through the leading conduit 74. Link. Next, the PE pipe 72 carried into the start shaft 62 is butt-joined by the preceding PE pipe 72 and the butt fusion machine 76, and the lead-in wire 70 is taken up from the reaching shaft 66 and joined in the tunnel 18. Introduce continuous PE pipe to become. This operation is repeated to lay the PE pipe, that is, the inner conduit 22 to the reach shaft 66. In addition, since the regular PE pipe 72 is joined by the butt fusion machine 76, there is an advantage that there is no need to use a joint and there is no protrusion on the outer peripheral surface.

  Then, an airtight test is performed as needed. In other words, the PE pipes laid from the compatible wells 62 and 64, that is, the both ends of the inner duct 22 are sealed, and in this state, a negative pressure is generated in the pipe to perform an airtight test.

  The method for laying the conduit 22 in the tunnel is not limited to the method shown in the embodiments of FIGS.

  Further, in the above-described embodiment, the inner conduit 22 is laid in the tunnel 18 and water is supplied from the inner pipeline 22 to the discharge conduit 44, so the tunnel 18 remains as it is. It is easy to reuse the tunnel 18 at a later date.

  On the other hand, in the embodiment shown in FIG. 6, the canal 18 itself is used as a water supply conduit of the water system. That is, a lid 78 is formed by a structure such as concrete at the exit of the sway 18 and the discharge pipe 44 having the same structure as that shown in FIG. 3 is formed in the through hole formed in the lid 78. Connecting. However, a lid (not shown) similar to the lid 78 may also be provided on the entrance side of the tunnel 18 and the connection pipe line 24 may be connected to a through hole (not shown) formed in the lid. In this embodiment, the water in the reservoir 14 is introduced into the culvert 18 through the water intake hose 26.

  Also in the embodiment of FIG. 6, by opening the gate valve 58 of the discharge pipe 44, the water accumulated in the canal 18 flows into the discharge pipe 44 and is discharged from the discharge port 48 to the water discharge pit 20. Then, when the gate valve 58 is closed, water discharge is stopped in a state in which sealed water is formed in the inclined portion 60 shown in FIG.

  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 ... Intake system 12 ... Dam body 14 ... Reservoir 16 ... Farm 18 ... Drainage channel 20 ... Discharge pit 22 ... Discharge pit 26 ... Intake hose 28 ... Intake float 44 ... Discharge line 48 ... Discharge port 56 ... Air valve or gas Separate exhaust valve device 58 ... Gate valve 60 ... Inclined portion 70 ... Retracting wire 72 ... PE pipe 76 ... Butt fusion machine 78 ... Lid

Claims (5)

A water intake system that discharges water from a reservoir pond to a pit in a farm field through a tunnel under the levee body,
A discharge pipe having a discharge port, receiving water that has passed through the tunnel, and discharging water from the discharge port to the pit; and an opening / closing valve provided in the discharge pipe line,
The water discharge system, wherein the discharge pipe includes a sealing portion provided so that the discharge port is higher than a pipe height in the on-off valve.   The water intake system according to claim 1, wherein the sealing portion includes an inclined portion in which the discharge pipe is inclined.   The water intake system according to claim 2, wherein the inclined portion is inclined at an angle of 45 ° or less.   4. The pipe according to claim 1, further comprising an inner pipe line that is laid in the tunnel and allows water from the reservoir to pass, and an inlet of the discharge pipe is connected to an outlet of the inner pipe. 5. Intake system as described in.   The water intake system according to claim 4, wherein the conduit in the tunnel includes a polyethylene pipe.

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