JP4544060B2 - Osmotic intake system - Google Patents

Description

  The present invention relates to an osmotic intake system, and more particularly to an osmotic intake system that guides seawater to a water collection facility such as a seawater desalination facility or a power plant by natural infiltration.

  Conventionally, perforated pipes were laid in a straight line from the shore to the offshore as a seepage water intake system for collecting seawater taken from the sea in groundwater desalination facilities and power collection facilities such as power plants. In addition, there are several perforated pipes embedded in the seabed offshore at the same depth and parallel to the coastline, and these perforated pipes and the pipes of the water collection facilities on the ground are connected via a water conduit. Proposed.

As an example of an infiltration water intake system having such a configuration, Patent Document 1 discloses a net for preventing sand from entering the surface of a perforated pipe in order to prevent sand from entering the perforated pipe. Or a non-woven fabric is wound, or a hole that penetrates the inside and outside is provided only at the lower part of the perforated tube.
As another example, when a plurality of perforated pipes are used, a structure is proposed in which the interval between the perforated pipes is set to be twice or more the embedding depth in order to obtain a predetermined water intake amount. ing.
Japanese Patent Publication No. 4-25769

By the way, in the seepage water intake system having the above-described configuration, a net or a non-woven fabric is wound around the surface of the perforated pipe in order to prevent sand from entering, so that the winding work is very troublesome.
In addition, even if a net or nonwoven fabric is wrapped around the surface of the perforated pipe, it is not possible to completely prevent sand from entering, so the amount of sand that accumulates inside the perforated pipe gradually increases over time, The water intake capacity gradually decreases, and troubles such as the inability to obtain a predetermined water intake occur. When such a trouble occurs, it is impossible to repair only that part, so the entire system must be disassembled and rebuilt.

  The present invention has been made in view of the conventional problems as described above, and a perforated pipe (a water intake pipe) or a parent pipe connecting the perforated pipe to a water conduit is damaged due to an unexpected cause. If a problem such as the inflow of foreign matter such as sand into the interior of the machine causes the specified water intake to be lost, repairs can be made to the location where the problem has occurred, thereby disassembling the entire system. An object of the present invention is to provide an osmotic water intake system capable of recovering a predetermined water intake amount without rebuilding.

In order to solve the above problems, the present invention employs the following means.
That is, the invention according to claim 1 is a plurality of intake pipes including at least one parent pipe made of a non-porous pipe and a perforated pipe connected to the parent pipe at predetermined intervals along the longitudinal direction. And a water guide pipe connecting between the parent pipe and the water collection facility, and the parent pipe and the intake pipe are embedded in the ground at a predetermined depth offshore, and the seawater naturally permeates into the ground. Is an osmotic intake system for collecting water into the intake pipe through each hole of the intake pipe and collecting water in the water collection facility via the intake pipe, the parent pipe, and the water conduit. the water guide pipe and the parent tube connecting portion of the water collecting chambers communicating between the water conduit is provided, it provided the inspection holes for going into the interior of said population water square in said population water squares, the intake chambers and It is that the water stop plate for blocking connecting between the water conduit and the parent tube is provided removably And it features a butterfly.

According to the infiltration water intake system of the present invention, it is possible to enter the inside of the catchment basin through the inspection hole, so that when trouble such as sand or other foreign matters flows into the catchment basin, The cause can be removed and repaired.
In addition, since a water stop plate is provided inside the catchment basin to detach the communication between the main pipe and the water conduit, troubles such as sand flowing into the main pipe When this occurs, the repair work can be performed in a state where the main pipe and the conduit pipe are blocked by a water stop plate and the flow of seawater is blocked. In addition, when two or more parent pipes are configured, one parent pipe is blocked by a water stop plate, and one parent pipe is repaired while the other parent pipe is in communication. Therefore, it becomes possible to carry out repair work of the parent pipe without stopping water intake.

The invention according to claim 2 is the osmotic intake system according to claim 1, and is connected to at least one parent pipe made of a non-porous pipe and to the parent pipe at predetermined intervals along the longitudinal direction. A plurality of intake pipes composed of perforated pipes and a water guide pipe connecting between the parent pipe and the water collection facility, and the parent pipe and the intake pipe are placed in a ground at a predetermined depth offshore. Seawater that is buried and naturally permeates into the ground is taken into the intake pipe through each hole of the intake pipe, and collected into the water collection facility through the intake pipe, the parent pipe, and the conduit pipe In the seepage water intake system, a water collecting basin is provided at a connecting portion between the parent pipe and the water conduit, and the water collecting basin enters the water collecting basin. the inspection hole for providing, the parent tube, especially that it is formed from a corrugated tube having a diameter larger than a diameter of the intake pipe And said to be.

According to the osmotic intake system of the present invention, the seawater taken into the intake pipe is reduced in flow rate by flowing from the intake pipe into the large-diameter parent pipe, and foreign substances such as sand contained in the seawater are removed from the corrugated pipe. Will be accumulated in the valley of the parent pipe .

According to a third aspect of the present invention, in the osmotic water intake system according to the first aspect, the parent pipe is formed of a corrugated pipe having a diameter larger than that of the water intake pipe .
Infiltration water intake system.

The invention according to claim 4 is the osmotic water intake system according to any one of claims 1 to 3, wherein an inspection hole for entering the inside of the parent pipe is provided in at least one place of the parent pipe. It is characterized by that.

According to the osmotic water intake system of the present invention, since it is possible to enter the inside of the main pipe through the inspection hole, troubles such as inflow of foreign substances such as sand into the inside of the main pipe and the intake pipe connected to the parent pipe occur. If this happens, the cause of the trouble can be removed and repaired .

The invention which concerns on Claim 5 is the osmosis | permeation water intake system of any one of Claims 1-4, Comprising: The space | interval of these several intake pipes was set in the range of 2.5m-7.5m. It is characterized by that.

According to the osmotic intake system of the present invention, the interval between the intake pipes is set in the range of 2.5 m to 7.5 m, so that the osmotic flow velocity in the surface layer portion of the ground can be made substantially uniform. Clogging can be prevented, and a predetermined water intake amount can be obtained.

The invention according to claim 6 is the seepage water intake system according to any one of claims 1 to 5, wherein the ground includes a crushed stone layer, and a particle size-adjusted crushed stone layer laminated on the crushed stone layer. And a sand layer laminated on the upper part of the particle size-adjusted crushed stone layer, wherein the parent pipe and the intake pipe are embedded in the crushed stone layer .

According to the infiltration water intake system of the present invention, the seawater that naturally permeates into the ground is taken into the intake pipe from each hole of the intake pipe through the sand layer, the particle size-adjusted crushed stone layer, and the crushed stone layer, It will be led to the ground water collection facility through the main pipe and the water conduit .

The invention according to claim 7 is the seepage water intake system according to claim 6, wherein the crushed stone layer and the particle size-adjusted crushed stone layer allow permeation of seawater and prevent sand particles from permeating through the sand layer. It is characterized by having a water-permeable structure .

According to the osmotic water intake system of the present invention, it is possible to prevent the sand particles of the sand layer from entering the crushed stone layer and the particle size adjusted crushed stone layer, so that a predetermined water intake amount can be stably obtained .

The invention according to claim 8 is the infiltration water intake system according to claim 6 or 7, wherein the infiltration flow velocity on the surface of the sand layer is set within a range of 4.0 to 8.0 (m / day). It is characterized by that .

According to the osmotic water intake system of the present invention, it is possible to prevent clogging of the sand layer, so that a predetermined water intake amount can be stably obtained .

The invention according to claim 9 is the infiltration water intake system according to any one of claims 6 to 8, wherein the water depth of the sand layer is deeper than the water depth at which the sand of the surface layer portion of the sand layer moves by 50 cm or more. And it is set shallower than the water depth which moves 1 cm or more .

According to the osmotic water intake system of the present invention, it is possible to prevent clogging of the sand layer, so that a predetermined water intake amount can be stably obtained .

As described above, according to the osmotic water intake system of the present invention, it is possible to enter the water collecting basin through the inspection hole. When a trouble such as the inflow of foreign matter occurs, the place where the trouble has occurred can be repaired.
In addition, since it is possible to enter the main pipe through the inspection hole, the main pipe or intake pipe is damaged due to an unexpected cause, and sand or other foreign matter flows into the main pipe or intake pipe. If a trouble occurs, the place where the trouble has occurred can be repaired.
In addition, since the water stop plate that blocks the communication between the main pipe and the conduit pipe is detachably provided on the catchment basin, if a trouble occurs inside the parent pipe, Since the restoration work can be performed by blocking the flow to the water conduit, the safety of the work can be ensured. In addition, when two or more parent pipes are configured, one parent pipe is blocked by a water stop plate, and one parent pipe is repaired while the other parent pipe is in communication. Therefore, it becomes possible to carry out repair work of the parent pipe without stopping water intake.
Further, since the parent pipe is formed of a corrugated pipe having a diameter larger than that of the water intake pipe, the flow rate of seawater flowing into the parent pipe from the intake pipe can be reduced, and foreign substances such as sand contained in the seawater can be removed from the valley of the corrugated pipe. Can be stored in the part.
Furthermore, since the infiltration flow rate of seawater in the surface layer portion of the ground can be made substantially uniform, clogging of the ground can be prevented, and a predetermined water intake amount can be obtained stably.

Hereinafter, embodiments of the present invention shown in the drawings will be described.
1 to 7 show an embodiment of an osmotic water intake system according to the present invention. FIG. 1 is an overall plan view, FIG. 2 is a sectional view of FIG. 1, and FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a partially enlarged view of FIG. 3, FIG. 6 is a cross-sectional view taken along line BB in FIG. It is.

  That is, as shown in FIGS. 1 and 2, this infiltration water intake system includes at least one (1 in this embodiment) parent pipe 1 embedded in the ground 41 at the same depth of the seabed 40, A plurality of intake pipes 10 connected to the pipe 1, a single conduit pipe 22 connecting the master pipe 1 and the ground water collection facility 47, and a connecting section of the conduit pipe 22 of the master pipe 1. And a water collecting basin 23 provided.

 The main pipe 1 is buried in the ground 41 of the seabed 40 at a predetermined depth offshore so as to be substantially parallel and horizontal to the coastline 46, and the central portion of the main pipe 1 in the longitudinal direction and the ground water collection facility 47. Are connected to each other through a water conduit 22 laid along the slope of the seabed 40.

  As shown in FIGS. 3, 4, 8, and 9, the parent pipe 1 is formed by connecting a plurality of non-porous high-density polyethylene corrugated pipes 2 via joints 4. Each of the corrugated pipes 2 is formed with an inner diameter that allows a person to enter. In the present embodiment, a plurality of corrugated tubes 2 having an inner diameter of φ1800 mm and a length of 5 m are connected, and the total length of the parent tube 1 is set to about 300 m. A disc-shaped closing plate 3 made of FRP or the like as shown in FIG. 8 is integrally attached to both end openings in the longitudinal direction of the parent tube 1 by welding or the like. The part is blocked. The parent pipe 1 is configured to be extendable via a joint 4.

  The main pipe 1 is not limited to one, and a plurality of the main pipes 1 may be embedded in the ground 41 so that each is parallel to the shoreline 46. In this case, a water collecting basin 23 may be provided at each connecting portion between the parent pipe 1 and the water conduit 22.

  The joint 4 is formed of FRP or the like, and as shown in FIGS. 8 and 9, a tubular joint part 6 and a central part in the longitudinal direction of the joint part 6 are orthogonal to the joint part 6. It is comprised from a pair of cylindrical intake pipe attachment parts 7 and 7 provided integrally, and it connects between the edge parts of the corrugated pipes 2 and 2 which adjoin via the joint part 6, and each intake pipe attachment part 7 is each connected. The intake pipe 10 is connected.

  The joint 4 is divided into a pair of semi-cylindrical joint halves 5 and 5, and both the joint halves 5 and 5 are connected between the ends of the corrugated pipes 2 and 2 adjacent to each other in the vertical direction, and between the corrugated pipes 2 and 2. The ends of a pair of intake pipes 10 and 10 connected to each other are fitted through rubber packings 8 and the edges of both joint halves 5 and 5 are tightened with bolts and nuts 9 so as to be adjacent to each other. The ends of the corrugated pipes 2 and 2 are connected to each other, and a pair of intake pipes 10 and 10 are connected between the corrugated pipes 2 and 2.

  As shown in FIG. 3 to FIG. 6, FIG. 8 and FIG. 9, an inspection unit 17 formed of FRP or the like is provided at a plurality of locations of the parent tube 1. It is configured to be able to enter the inside of the. Each inspection part 17 includes a cylindrical inspection hole 18 provided perpendicularly to the central part of the corrugated pipe 2 located between adjacent joints 4, 4, and an opening / closing lid 19 that opens and closes the opening of the inspection hole 18. The inspection hole 18 is composed of a fixing portion 20 that fixes the corrugated tube 2 to the central portion of the corrugated tube 2, and the corrugated tube 2 corresponding to the inspection hole 18 is provided with a hole penetrating the inside and the outside.

 As shown in FIG. 9, the fixing part 20 of the inspection part 17 is divided into a pair of semi-cylindrical fixing halves 21, 21, and an inspection hole 18 stands vertically at the center part of the one fixing half 21. Has been. The inspection unit 17 fits both the fixed halves 21 and 21 to the outer peripheral surface of the corrugated pipe 2 from above and below via the packing 8 and tightens the edges of the both fixed halves 21 and 21 with bolts and nuts 9. Thus, the corrugated tube 2 is attached to the central portion.

  As shown in FIGS. 10 to 12, the intake pipe 10 is formed from a corrugated pipe 11 made of a perforated type high-density polyethylene. The trough 12 of the intake pipe 10 is provided with a plurality of holes 13 penetrating inside and outside, and configured to be able to take in seawater into the intake pipe 10 through the holes 13.

  As shown in FIGS. 10 and 11, one end of the intake pipe 10 is connected to each intake pipe mounting portion 7 of the joint 4 via a packing 8. A disc-shaped closing plate 14 made of high-density polyethylene as shown in FIG. 11 is integrally attached by welding or the like, and the other end opening of the intake pipe 10 is closed by this closing plate 14. The intake pipe 10 is formed to have a predetermined length by connecting one corrugated pipe 11 or a plurality of corrugated pipes 11 via a cylindrical joint 15. The joint 15 is composed of a pair of semi-cylindrical joint halves 16, 16, and between the ends of the corrugated pipes 11, 11 by tightening between the edges of the joint halves 16, 16 with bolts and nuts 9. Are concatenated.

  As shown in FIGS. 13 and 14, the catchment basin 23 has an outer wall 24 erected vertically in the ground 41 of the seabed 40, a bottom plate 37 that closes the bottom of the outer wall 24, and an upper portion of the outer wall 24. A water collecting space 29 is formed in a portion surrounded by the outer wall 24, the bottom plate 37, and the upper plate 38.

  The outer wall 24 has a rectangular tube shape composed of four walls including a front wall 25, a rear wall 26, a left lateral wall 27, and a right lateral wall 28, and one end portion of the water conduit 22 penetrates through the center of the front wall 25. In this state, the corrugated pipe 2 of the parent pipe 1 is integrally connected to the portions near the rear wall 26 of the left lateral wall 27 and the right lateral wall 28 with the end of the corrugated pipe 2 passing therethrough.

  A partition wall 30 is provided in the central portion of the water collecting space 29 of the water collecting basin 23 in parallel and perpendicular to the left lateral wall 27 and the right lateral wall 28, and between the tip of the partition wall 30 and the left lateral wall 27, and the right lateral wall. 28, a water stop plate 31 is detachably provided. And normally, both the water stop plates 31 and 31 are in a removed state, and the left and right parent pipes 1 and 1 and the water guide pipe 22 are in a state of communicating with each other via a water collecting rod 23. On the other hand, when troubles such as damage to the left and right parent pipes 1 and 1 due to an unexpected cause such as an earthquake and the inflow of foreign matter such as sand flow into the inside, either the right or left water stop plate 31 is attached, the space between one parent pipe 1 and the water guide pipe 22 is shielded via the water stop plate 31 to perform repair work for the troubled part. In this case, since the water stop plate 31 is not attached to the other parent pipe 1 side, there is a state in which the other parent pipe 1 and the water guide pipe 22 communicate with each other via the water collecting basin 23. The amount of water intake can be secured. The water stop plate 31 is constituted by a shutter, for example.

  In the portion of the upper plate 38 corresponding to the left side of the partition wall 30 of the water collecting basin 23 and the portion of the upper plate 38 corresponding to the right side, a cylindrical inspection hole 35 penetrating the inside and outside of the water collecting basin 23 is erected vertically. In addition, it is configured to be able to enter the left portion of the partition wall 30 and the right portion of the partition wall 30 through the inspection hole 35. The opening of each inspection hole 35 is configured to be opened and closed by an opening / closing lid 36.

  As shown in FIG. 11, the ground 41 on the seabed in which the main pipe 1, the intake pipe 10, the catchment basin 23, and the inspection unit 17 are embedded is a crushed stone layer 43 and a particle size adjustment stacked on the crushed stone layer 43. It consists of a crushed stone layer 44 and a sand layer 45 laminated on the upper part of the particle size-adjusted crushed stone layer 44, and the intake pipe 10 is embedded horizontally in the center of the crushed stone layer 43 in the thickness direction.

  The crushed stone layer 43 is composed of an aggregate of crushed stones having a random particle size, and the particle size-adjusted crushed stone layer 44 is composed of an aggregate of crushed stones having a particle size within a predetermined range. A filter layer 42 for filtering seawater is configured.

  The crushed stone layer 43 and the particle size-adjusted crushed stone layer 44 are composed of inorganic granular materials such as crushed stone. Note that the crushed stone layer 43 and the particle size-adjusted crushed stone layer 44 are not limited to inorganic granular materials such as crushed stone, but may be composed of gravel, glass, plastic, or the like.

The filter layer 42 is configured to have a semi-permeable structure that allows permeation of seawater and prevents sand particles 45 from passing therethrough. The semi-permeable structure is obtained by satisfying the following two conditions.
(1) Of the passing weight percentage of crushed stone that is a constituent material of the particle size-adjusted crushed stone layer 44 of the filter layer 42, 15% particle size value AD ₁₅ is 15% of the passing weight percentage of sand particles that are the constituent material of the sand layer 45. The value divided by the% particle size value SD ₁₅ is greater than 5.
(2) Of the passing weight percentage of crushed stone that is a constituent material of the particle size-adjusted crushed stone layer 44 of the filter layer 42, the 15% particle size value AD ₁₅ is 85% of the passing percentage of sand particles that are the constituent material of the sand layer 45. The value divided by the% particle size value SD ₈₅ is less than 5.

In the present embodiment, the semi-permeable structure as described above is also applied between the particle size-adjusted crushed stone layer 44 and the crushed stone layer 45 of the filter layer 42. In this case, a semi-permeable structure is obtained by satisfying the following two conditions.
(1) Of the passing weight percentage of crushed stone that is the constituent material of the crushed stone layer 43 of the filter layer 42, the 15% particle size value BD ₁₅ is the percentage of the passing weight percentage of crushed stone that is the constituent material of the particle size adjusted crushed stone layer 44. The value divided by the 15% particle size value AD ₁₅ is greater than 5.
(2) of the passage the weight percentage of crushed stone is the material of the crushed stone layer 43, a 15% particle diameter value BD _15, among the crushed rock passes percentages are constituent material of the crushed stone for mechanical stabilization layers 44, 85% particle diameter value The value divided by AD ₈₅ is less than 5.

  Moreover, in this Embodiment, the seawater infiltration flow velocity expressed in the sand layer 45 by the water intake effect | action by the water intake pipe 10 is 4.0-8.0 (m / day). Here, the seawater permeation flow rate is a permeation rate when seawater permeates the surface layer portion of the sand layer 45. The faster the seawater permeation flow rate, the more seawater can be taken. Hesilt is infiltrated, causing the sand layer 45 to be clogged. On the other hand, if the seawater infiltration flow rate is too slow, the amount of water intake becomes small and the water intake efficiency becomes very poor, and sufficient oxygen cannot be supplied into the sand layer 45, causing a problem of killing the biofilm. .

  For this reason, in this Embodiment, in order to prevent the above problems, as shown in FIG. 15, the space | interval of the intake pipe 10 which consists of a perforated pipe | tube is in the range of 2.5m-7.5m. The seawater infiltration flow rate is set within the range of 4.0 to 8.0 (m / day).

  That is, since the particle size of the silt particles is about 0.005 mm to 0.074 mm, the flow velocity of seawater (movement limit flow velocity) at which the silt does not start is obtained. Here, the movement limit flow velocity is a value obtained by multiplying the limit actual flow velocity of the silt particles by the area porosity. The area porosity is set to 0.35. The limit actual flow velocity of the silt particles is obtained using a graph (the measurement result by Geotechnical Society: “Geotechnical Handbook”, Hokkodo, p1041, 1999, Kubota, Tanaka) representing the relationship between the particle size and the limit actual flow velocity. From this graph, the limit actual flow rate of silt particles having a particle size of 0.08 mm can be read as 0.026 cm / s. Accordingly, the upper limit of the movement limit flow velocity of silt is 0.026 × 0.35 × 24 × 3600 = 786.24 (cm / day) .about.8.0 (m / day).

  From this result, in order not to cause clogging due to silt, it is necessary to set the seawater infiltration flow velocity to 8.0 (m / day) or less at the maximum. Further, in order to supply sufficient oxygen into the sand layer 45 and not kill the biofilm, a seawater infiltration flow rate of at least 1.0 (m / day) is required. From these facts, it is best to set the seawater infiltration flow rate within the range of 1.0 to 8.0 (m / day), but in the present embodiment, in consideration of the reality, FIG. As shown in Fig. 4, the value is set within a narrower range of 4.0 to 8.0 (m / day).

  By setting the seawater infiltration flow rate within such a range, the seawater naturally permeates through the sand layer 45 at a predetermined infiltration flow rate, so that nitrifying bacteria or the like formed around the sand particles in the sand layer 45 It comes into contact with a biofilm made of microorganisms and is biofiltered by this biofilm and purified to the bacterial level.

  Furthermore, the water depth of the sand layer 45 of the ground 41 in which these intake pipes 10 are buried is set to be deeper than the water depth at which the sand of the surface layer portion of the sand layer 45 moves by 50 cm or more and shallower than the water depth by which 1 cm or more moves. These water depths are determined not only by numerical calculations, but also based on various oceanographic observation data such as moving sand drift observation data, wave data, bottom sediment data, tidal current analysis data, etc. using radioactive tracers. It is done. This water depth varies depending on the sea area. By setting the sand layer 45 to such a thickness, the surface layer portion of the sand layer 45 can be appropriately agitated by waves and tides, so that the clogging of the surface portion of the sand layer 45 can be more effectively prevented. .

  In the seawater intake system according to the present embodiment configured as described above, since it is configured to be able to enter the inside of the catchment basin 23 and the inside of the parent pipe 1 from the inspection holes 18 and 35, an earthquake or the like If the main pipe 1 or the water intake pipe 10 is damaged due to an unexpected cause of the water, and a foreign matter such as sand flows into the inside of the main pipe 1 or the water intake pipe 10 and the water intake amount decreases, By entering the inside of the pipe 1 through the inspection holes 18 and 35, the trouble portion can be repaired. Therefore, when trouble occurs, it is not necessary to disassemble and reconstruct the entire system.

 Moreover, when entering the inside of the water collecting basin 23 and the inside of the main pipe 1 from the inspection holes 18 and 35, the water guide pipe 22 and the main pipe 1 can be blocked by the water stop plate 31. The main pipe 1 and the water conduit 22 are shut off, the parent pipe 1 is repaired, and communication between the other parent pipe 1 and the water conduit 22 is ensured to continue water intake. Therefore, the repair work can be performed without stopping the water intake.

 Further, since the corrugated pipes 2 and 11 are used for the main pipe 1 and the intake pipe 10 and the main pipe 1 has a larger diameter than the water pipe 10, sand or the like entering the inside of the intake pipe 10 and the main pipe 1, etc. Can be accumulated in the valleys of the corrugated tubes 2 and 11. Moreover, since the flow velocity of the seawater flowing into the main pipe 1 from the intake pipe 10 can be lowered, foreign substances such as sand can be efficiently stored in the valleys of the corrugated pipe 2 of the parent pipe 1.

 Furthermore, since the intake pipe 10 can be increased by extending the length of the parent pipe 1, it becomes possible to flexibly cope with a design change due to an increase in the future intake quantity.

  Furthermore, since the interval between the intake pipes 10 is set in the range of 2.5 m to 7.5 m, the infiltration flow rate in the surface layer portion of the sand layer 45 can be set substantially uniformly. Therefore, the surface layer portion of the sand layer 45 is not locally clogged due to variations in the infiltration flow rate, and a predetermined water intake amount can be reliably ensured by natural infiltration.

  Furthermore, since the infiltration flow rate is set within the range of 4.0 to 8.0 (m / day), silt does not enter the sand layer 45 and the sand layer 45 is clogged. Therefore, a predetermined water intake amount can be reliably obtained.

 Furthermore, since the water depth of the sand layer 45 is set to a value where the surface layer portion of the sand layer 45 is appropriately stirred by waves and tides, the movement of the surface portion of the sand layer 45 stops and clogging occurs. Therefore, a predetermined water intake amount can be obtained with certainty.

It is the top view which showed the whole one Embodiment of the osmosis | permeation water intake system by this invention. It is sectional drawing of FIG. It is the elements on larger scale of FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a partially enlarged view of FIG. 3. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is CC sectional view taken on the line of FIG. It is the elements on larger scale of FIG. It is a front view of FIG. It is the elements on larger scale of FIG. It is a front view of FIG. It is an enlarged view of an intake pipe. It is a top view of a catchment basin. It is the DD sectional view taken on the line of FIG. It is explanatory drawing which showed the relationship between the osmosis | permeation flow rate and the space | interval of a water intake pipe.

Explanation of symbols

1 Parent pipe 2 Corrugated pipe (Non-hole type)
3 Blocking Plate 4 Joint 5 Joint Half 6 Joint Part 7 Intake Pipe Mounting Part 8 Packing 9 Bolt / Nut 10 Intake Pipe 11 Corrugated Pipe (Perforated Type) 12 Valley Part 13 Hole 14 Blocking Plate 15 Joint 16 Joint Half 17 Inspection Portion 18 Inspection hole 19 Opening / closing lid 20 Fixing portion 21 Fixing half portion 22 Water conduit 23 Water collecting rod 24 Outer wall 25 Front wall 26 Rear wall 27 Left side wall 28 Right side wall 29 Water collecting space 30 Bulkhead 31 Water stop plate 35 Inspection hole 36 Opening / closing Lid 40 Seafloor 41 Ground 42 Filter layer 43 Crushed stone layer 44 Grain-regulated crushed stone layer 45 Sand layer 46 Coastline 47 Catchment facility

Claims (9)

At least one parent pipe made of a non-porous pipe, a plurality of intake pipes made of perforated pipes connected to the parent pipe at predetermined intervals along the longitudinal direction, the parent pipe and the water collecting facility, And a conduit pipe connecting between the
The master pipe and the intake pipe are embedded in the ground at a predetermined water depth offshore, and the seawater that naturally permeates into the ground is taken into the intake pipe through the holes of the intake pipe, the intake pipe, An osmotic intake system for collecting water in the water collection facility via the parent pipe and the water conduit;
Providing a water collecting basin that communicates between the parent pipe and the water guiding pipe at a connecting portion between the parent pipe and the water guiding pipe, and providing an inspection hole for entering the water collecting basin in the water collecting basin;
A seepage water intake system , wherein a water stop plate for connecting and disconnecting between the parent pipe and the water conduit pipe is detachably provided on the water intake trough. At least one parent pipe made of a non-porous pipe, a plurality of intake pipes made of perforated pipes connected to the parent pipe at predetermined intervals along the longitudinal direction, the parent pipe and the water collecting facility, And a conduit pipe connecting between the
The master pipe and the intake pipe are embedded in the ground at a predetermined water depth offshore, and the seawater that naturally permeates into the ground is taken into the intake pipe through the holes of the intake pipe, the intake pipe, An osmotic intake system for collecting water in the water collection facility via the parent pipe and the water conduit;
Providing a water collecting basin that communicates between the parent pipe and the water guiding pipe at a connecting portion between the parent pipe and the water guiding pipe, and providing an inspection hole for entering the water collecting basin in the water collecting basin;
The permeate water intake system , wherein the parent pipe is formed of a corrugated pipe having a diameter larger than that of the water intake pipe . The osmotic intake system according to claim 1, wherein the parent pipe is formed of a corrugated pipe having a diameter larger than that of the intake pipe . The infiltration water intake system according to any one of claims 1 to 3, wherein an inspection hole for entering the inside of the parent pipe is provided in at least one place of the parent pipe . The osmotic water intake system according to any one of claims 1 to 4, wherein an interval between the plurality of water intake pipes is set in a range of 2.5 m to 7.5 m .   The ground is composed of a crushed stone layer, a particle size-adjusted crushed stone layer laminated on the upper portion of the crushed stone layer, and a sand layer laminated on the upper portion of the particle-sized adjusted crushed stone layer. The permeation water intake system according to any one of claims 1 to 5, wherein a water pipe is embedded.   The infiltration water intake system according to claim 6, wherein the crushed stone layer and the particle size-adjusted crushed stone layer are set in a semi-permeable structure that allows permeation of seawater and prevents the sand particles from permeating through the sand layer. .   The infiltration water intake system according to claim 6 or 7, wherein an infiltration flow rate on the surface of the sand layer is set within a range of 4.0 to 8.0 (m / day).   The water depth of the sand layer is set to be deeper than the water depth in which the sand of the surface layer portion of the sand layer moves 50 cm or more and shallower than the water depth to move 1 cm or more. The infiltration water intake system according to item.

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