JP5916302B2 - Underground irrigation system and water pipe used therefor - Google Patents

Description

  The present invention relates to an underground irrigation system and a water supply pipe used therefor, and more particularly to an underground irrigation system that supplies water to soil from a water supply pipe buried underground, and a water supply pipe used therefor.

  Conventionally, surface irrigation for supplying water from the ground surface to the soil using a perforated hose or a sprinkler or the like laid on the ground surface is generally used for irrigation of fields and the like. Here, the water supplied to the soil by surface irrigation will also moisten the soil surface and the plant surface, but these waters only evaporate into the atmosphere (ie, surface evaporation), so wasting water. Occurs. In addition, the mud of the soil may hinder the work, and may cause problems such as mud splashing and solidification of the soil surface. Furthermore, in the case of house cultivation, the humidity in the house becomes excessively high due to moisture evaporated on the surface, which may cause plant diseases.

  On the other hand, in underground irrigation that supplies water to the soil from a water pipe buried underground, the surface of the supplied water does not evaporate, so that waste of water can be reduced and water resources can be used efficiently. . Moreover, the malfunction resulting from surface irrigation, such as the soil becoming muddy or the humidity in the house rising excessively, does not occur. For this reason, in recent years, various underground irrigation systems have been proposed.

  For example, Patent Document 1 discloses an underground irrigation system (underground irrigation system) proposed by the present applicant. In the technique of Patent Document 1, a gravitational water-state soil portion is formed inside a water-impervious member formed in a container shape with an upper opening, and water from the gravitational water-state soil portion to the plant rhizosphere soil by capillary action. To supply. As an example, a horizontal tubular (horizontal container-shaped) water shielding member having an opening on the upper side is used.

Patent Document 2 discloses an example of an irrigation hose used in a conventional underground irrigation system. The irrigation hose of Patent Document 2 is a hose having a three-layer structure having a braided yarn reinforcing layer in an intermediate layer, and the inner layer and the outer layer have holes independent of each other. The braided yarn reinforcing layer forms a gap connecting the holes of the inner layer and the outer layer so that the inside and outside of the hose can be communicated. When underground irrigation is performed using this irrigation hose, one end of the irrigation hose is sealed, and a water pipe is connected to the other end to apply water pressure. Thereby, the water in the irrigation hose passes through the holes in the inner layer and the outer layer and the braided yarn reinforcing layer and is supplied to the soil.
JP 2010-29072 A [A01G 25/00] JP 2000-346253 A [F16L 11/12]

  In the technique of Patent Document 1, a soil portion in a gravitational water state is formed in the water-impervious member of the upper opening. Therefore, when the water-impervious member is installed with inclination, gravity water in the water-impervious member spills from the opening during irrigation. There is a possibility that. For this reason, in the technique of patent document 1, since it is necessary to install a water-impervious member horizontally, attention is required for the installation work of the water-impervious member, especially when applied to cultivated land (inclined land) having an inclination. The arrangement of the water shielding member is restricted.

  Moreover, although the irrigation hose of patent document 2 is applicable also to sloping ground, in order to perform irrigation using this irrigation hose, since it is necessary to supply water with a high pressure more than fixed, special pumps etc. A separate water supply facility is required. Therefore, in the underground irrigation system using the technique of Patent Document 2, the equipment cost, the maintenance management cost, and the like increase.

  Therefore, a main object of the present invention is to provide a novel underground irrigation system and a water pipe used therefor.

  Another object of the present invention is to provide an underground irrigation system and a water supply pipe used therefor that can be suitably used even on sloping ground without requiring a special water supply facility such as a pump.

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

The first invention is a cultivated land having an inclined, water flowing out from the holes of the water supply pipe is buried underground in a underground irrigation system for feeding subjected to soil rhizosphere of plants by the capillary phenomenon of the soil, water The tube is formed on at least a part of the circumferential direction on the inner surface side of the tube, and is formed in each of a plurality of groove portions arranged in the axial direction and a bottom portion of the groove portion, and a plurality of holes arranged at predetermined intervals in the circumferential direction. The water supplied into the water supply pipe is distributed to each of the grooves, and the water temporarily stored in the grooves is gradually discharged into the soil from the holes .

In the first invention, the underground irrigation system (10) includes a water supply pipe (12) buried underground, and supplies water to the soil from the water supply pipe. The water supply pipe is formed of synthetic resin, metal, or the like, and a plurality of grooves (20) arranged at intervals in the axial direction are formed on the inner surface side of the pipe. In the embodiment, the water supply pipe has a corrugated pipe wall in which a plurality of peak portions (22) and valley portions (24) are alternately arranged in the axial direction, and the inner surface side of the peak portion serves as a groove portion. Used. In addition, a plurality of holes (26) arranged at predetermined intervals in the circumferential direction are formed in each groove portion of the water supply pipe. At the time of irrigation, water supplied from a water supply source (16) such as an agricultural water pipe into the water supply pipe is distributed to each groove and gradually supplied to the soil through each hole.

  According to the first aspect, since the plurality of grooves are formed on the inner surface side of the water supply pipe, water can be stored in each of the grooves when irrigating. For this reason, even if a water supply pipe is installed inclining in the axial direction, water supply from the water supply pipe can be irrigated substantially evenly with respect to the soil without being partially biased. Therefore, it can be suitably used even on slopes. Further, even when the water pressure of the water supply source is low, water can be irrigated from the water supply pipe to the soil, so that it is not necessary to use a special water supply facility such as a pump, and the facility cost and the maintenance management cost can be reduced.

A second invention is according to the first invention, the water supply pipe is inserted into a plurality of further example Bei a water conduit for guiding water into the groove through the through hole or gap formed tube wall, the tube of the conduit The axial interval for forming the through-hole or void in the wall is set equal to or less than the axial interval for forming the groove in the water supply pipe.

In 2nd invention, the water conduit (14) penetrated in a water supply pipe (12) is further provided. A water conduit has a hole (30), a space | gap, etc. in a pipe wall, for example, and guides the water from a water supply source (16) into each groove part (20) of a water supply pipe through the pipe wall. And the axial interval which forms a through-hole or a space | gap in the pipe wall of a water conduit is set to be equivalent to or less than the axial interval which forms a groove part in a water supply pipe.

  According to 2nd invention, even if it installs so that a water supply pipe may meander up and down, water is reliably supplied to each groove part of a water supply pipe. Therefore, the ground irrigation system can be suitably used not only for cultivated land having a uniform slope but also for cultivated land with ups and downs (up and down).

  3rd invention depends on 1st or 2nd invention, and a water supply pipe is provided with the osmosis | permeation material provided in each of the hole of a groove part.

  In the third aspect of the invention, each of the holes (26) formed in the groove (20) of the water supply pipe (12) is provided with a permeable material (36) having water permeability. The penetrating material is formed, for example, by twisting a plurality of fibers into a rod shape, or twisting a strip-like nonwoven fabric into a rod shape, and is attached so as to fit into the hole of the groove portion.

  According to the third aspect of the present invention, it is possible to prevent clogging of the hole because the intrusion of earth and sand or plant roots into the hole of the groove portion of the water supply pipe is prevented.

  A fourth invention is dependent on any one of the first to third inventions, and further includes a water shielding member embedded under the water supply pipe.

  In the fourth invention, a water shielding member (38) is embedded below the water supply pipe (12). The water-impervious member is a sheet or plate having a water-impervious property formed of a synthetic resin or the like, and regulates the movement of water supplied to the soil from the water supply pipe. For example, the water shielding member is disposed in a strip shape in a substantially horizontal direction so as to extend over the entire length of the water supply pipe below the water supply pipe.

  According to the fourth aspect of the invention, wasteful diffusion of water below the soil is prevented by the water shielding member, so that moisture can be appropriately supplied to the plant rhizosphere.

A fifth invention is a water supply pipe that is used in the underground irrigation system according to the first invention and supplies water from the underground to the soil, and is formed on at least a part of the circumferential direction on the pipe inner surface side, In addition, a plurality of grooves arranged in the axial direction and a plurality of holes formed at predetermined intervals in the circumferential direction are formed in each of the groove parts and the bottom part of the groove part , and the size of the holes is determined by the water supplied into the water supply pipe. It is a water supply pipe set to the magnitude | size which reaches to the groove part of the downstream end side of a pipe | tube.

In the fifth invention, the water supply pipe (12) is used in the underground irrigation system (10), and supplies water from the underground to the soil. The water supply pipe is formed of synthetic resin, metal, or the like, and a plurality of grooves (20) arranged at intervals in the axial direction are formed on the inner surface side of the pipe. In the embodiment, the water supply pipe has a corrugated pipe wall in which a plurality of peak portions (22) and valley portions (24) are alternately arranged in the axial direction, and the inner surface side of the peak portion serves as a groove portion. Used. In addition, a plurality of holes (26) arranged at predetermined intervals in the circumferential direction are formed in each groove portion of the water supply pipe. The size of the hole is set such that the water supplied into the water supply pipe reaches the groove on the downstream end side of the water supply pipe. At the time of irrigation, water supplied from a water supply source (16) such as an agricultural water pipe into the water supply pipe is distributed to each groove and gradually supplied to the soil through the holes.

  According to the fifth aspect, since the plurality of groove portions are formed on the inner surface side of the tube, water can be stored in each of the groove portions during irrigation. For this reason, even if a water supply pipe is installed inclining in the axial direction, water supply from the water supply pipe can be irrigated substantially evenly with respect to the soil without being partially biased. Therefore, it is possible to provide an underground irrigation system that can be suitably applied to slopes. In addition, even if the water pressure of the water supply source is low, water can be irrigated from the water supply pipe to the soil, so there is no need to use special water supply equipment such as a pump, and the equipment cost and maintenance management cost of the underground irrigation system can be reduced. Can be reduced.

  According to the present invention, since the plurality of grooves are formed on the pipe inner surface side of the water supply pipe, water can be stored in each of the grooves when water is supplied. For this reason, even if a water supply pipe is installed inclining in the axial direction, water supply from the water supply pipe can be irrigated substantially evenly with respect to the soil without being partially biased. Therefore, it can be suitably used even on slopes. Further, even when the water pressure of the water supply source is low, water can be irrigated from the water supply pipe to the soil, so that it is not necessary to use a special water supply facility such as a pump, and the facility cost and the maintenance management cost can be reduced.

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

It is an illustration figure which shows a mode that the underground irrigation system which is one Example of this invention was applied to the sloping ground, (A) shows the external appearance and partial cross section which looked at the underground irrigation system from the side, (B ) Shows a cross section of the underground irrigation system as seen from the axial direction. It is an illustration figure which shows an example of the water supply pipe with which the underground irrigation system of FIG. 1 is provided, (A) shows the external appearance and partial cross section which looked at the water supply pipe from the side, (B) The cross section seen from the direction is shown. It is an illustration figure which shows the flow of the water in the underground irrigation system of FIG. It is an illustration figure which shows another example of the water supply pipe with which an underground irrigation system is provided, (A) shows the external appearance and partial cross section which looked at the water supply pipe from the side, (B) is an axial direction of a water supply pipe The cross section seen from is shown. It is an illustration figure which shows the flow of the water in the underground irrigation system at the time of not using the water conduit which is another Example of this invention. It is an illustration figure which shows the cross section which looked at the underground irrigation system which is further another Example of this invention from the axial direction.

  Referring to FIG. 1, an underground irrigation system 10 according to an embodiment of the present invention includes a water supply pipe 12 and a water conduit 14 embedded in a basement, and is applied to, for example, a cultivated land (inclined land) 100 having an inclination. The water necessary for plant growth is supplied to the soil from the underground. Although details will be described later, in this embodiment, water from the water supply source 16 is spread over the entire length of the water supply pipe 12 by the water guide pipe 14 and water is supplied to the soil from the plurality of grooves 20 formed in the water supply pipe 12. .

  As shown in FIG. 2, the water supply pipe 12 is formed of a synthetic resin such as polyvinyl chloride or polyethylene, or a metal such as stainless steel, and a plurality of groove portions 20 arranged at intervals in the axial direction on the pipe inner surface side. Is formed. In this embodiment, the water supply pipe 12 has a corrugated (bellows-like) pipe wall that alternately repeats an annular peak portion 22 and a valley portion 24, and the inner surface side of the peak portion 22 is in the circumferential direction. It becomes the annular groove part 20 extended over the perimeter. In addition, although the cross-sectional shape of the groove part 20 has illustrated the trapezoidal thing in FIG. 2, it is not limited to this, A suitable shape is applicable, for example, circular shape, square shape, etc. may be sufficient. The water supply pipe 20 is not limited to a circular pipe, and may be an elliptical or rectangular pipe. The magnitude | size of the water supply pipe | tube 12 and the groove part 20 is not specifically limited, It sets suitably by the soil component etc. of the cultivated land 100 to apply. As an example, the outer diameter of the water supply pipe 12 (the outer diameter of the peak portion 22) is, for example, 50-300 mm, and the width and depth of the groove portion 20 are each, for example, 5-50 mm.

  In addition, a plurality of through holes 26 are formed in the bottom part of each groove part 20 (the top part of the peak part 22) arranged at predetermined intervals in the circumferential direction. The predetermined interval in the circumferential direction is such that the through hole 26 is located near the bottom of the water supply pipe 12 regardless of the circumferential position of the water supply pipe 12, that is, even if the water supply pipe 12 rotates or twists. Set to The size of the through hole 26 is, for example, 1-5 mm in diameter.

  Although FIG. 2 illustrates an example in which eight circular through holes 26 are arranged in a line in the circumferential direction at the center of the bottom of the groove 20, the present invention is not limited to this. For example, the through holes 26 may be formed in a slit shape, arranged in two or more rows in the circumferential direction, or randomly distributed over the entire tube wall forming the groove 20. . The size, shape, formation position, number, and the like of the through holes 26 are appropriately set according to the soil components of the cultivated land 100 to be applied. By adjusting and changing these, the water pipe 12 to the soil The amount of water supply can be controlled.

  For the production of the water supply pipe 12, a general-purpose corrugated pipe (corrugated pipe) is preferably used as the original pipe, and a water supply pipe is easily and inexpensively made by drilling a through-hole using a drill or the like in the peak portion of the original pipe. 12 can be made.

  Returning to FIG. 1, such a water supply pipe 12 is embedded in the cultivated land 100 along the root zone of the plant, for example. In addition, although the one water supply pipe 12 is shown in FIG. 1, when the cultivated land 100 is wide, it is good to arrange | position the several water supply pipe 12 in parallel. For example, in the cultivated land 100 having a plurality of reeds, the water supply pipes 12 may be disposed for each reed, or the water supply pipes 12 may be disposed at a ratio of 1 to 2 per reed. The interval between adjacent water supply pipes 12 is, for example, 500-2000 mm. Moreover, although the water supply pipe | tube 12 is fundamentally arrange | positioned at linear form, you may arrange | position so that it may meander.

  Further, a water conduit 14 formed of synthetic resin or synthetic rubber is inserted into the water supply pipe 12. The water guide pipe 14 is inserted over the entire length of the water supply pipe 12 and guides the water from the water supply source 16 to each groove 20 of the water supply pipe 12 through holes and voids formed in the pipe wall. is there. In this embodiment, the water guide pipe 14 is a perforated pipe having a plurality of through holes 30 in the pipe wall. The outer diameter of the water conduit 14 is, for example, 5-30 mm, and the size of the through hole 30 formed in the tube wall of the water conduit 14 is, for example, 1-5 mm in diameter. In addition, the axial interval in which the through holes 30 of the water conduit 14 are formed is the axial interval in which the grooves 20 of the water supply pipe 12 are formed so that water can be reliably guided to all the grooves 20 of the water supply pipe 12. Is preferably set to be equal to or lower than. In addition, the hole, the space | gap, etc. which are formed in the pipe wall of the water conduit 14 are not limited to what penetrates a pipe wall linearly, A porous form or a mesh shape may be sufficient. Further, when water is introduced to the water supply pipe 12, it may be supplied with a weak pressure.

  The downstream ends of the water supply pipe 12 and the water guide pipe 14 are appropriately sealed with a pipe end cap (not shown) or the like. Further, the upstream end portion of the water conduit 14 is connected to a water supply source 16 such as an agricultural water pipe (water pipe line) or a water storage tank via a water distribution pipe 32.

  In such an underground irrigation system 10, at the time of irrigation, water is supplied from the water supply source 16 to the conduit pipe 14 by manually opening and closing a valve 34 provided in the water distribution pipe 32, for example. However, water may be automatically supplied from the water supply source 16 in a predetermined time period using a solenoid valve, a timer, or the like, or the water intake from the water supply source 16 may be adjusted appropriately to May be constantly supplied.

  As shown in FIG. 3, the water supplied from the water supply source 16 to the water guide pipe 14 is transported through the water guide pipe 14 over the entire length of the water supply pipe 12 and from each through hole 30 to the water guide pipe 14. It goes out and is distributed in each groove part 20 of the water supply pipe 12. And the water temporarily stored in the groove part 20 is gradually supplied to soil through the through-hole 26, and permeates around the water supply pipe 12 by a capillary phenomenon. As described above, in the underground irrigation system 10, water can be stored in each of the groove portions 20 of the water supply pipe 12. Therefore, even if the water supply pipe 12 is installed inclined in the axial direction, Water can be irrigated substantially evenly with respect to the soil without partial supply.

  As described above, the amount of water supplied from the water supply pipe 12 to the soil can be controlled by the size, shape, formation position, number, and the like of the through holes 26 of the groove portion 20. In this case, the water supply pipe The amount of water that goes out to the soil from 12 and the amount of water that is supplied from the water conduit 14 to the water supply pipe 12 are set to be approximately the same. However, the diameter of the through-hole 26 formed in the groove portion 20 of the water supply pipe 12 is increased so that the water supplied to the groove portion 20 immediately goes out to the soil. Control may be performed according to the amount of water supplied to the water supply pipe 12 (groove 20).

  According to this embodiment, since water can be stored in each of the plurality of grooves 20 formed at intervals in the axial direction of the water supply pipe 12, even if the water supply pipe 12 is installed inclined in the axial direction. The water supply from the water supply pipe 12 can be substantially uniformly irrigated with respect to the soil without being partially biased. That is, since it is not necessary to perform the leveling of the water supply pipe 12 accurately, the water supply pipe 12 can be suitably used even on an inclined land. Moreover, even when the water pressure of the water supply source 16 is low, water can be irrigated from the water supply pipe 12 to the soil, so that it is not necessary to use a special water supply facility such as a pump, and equipment costs, maintenance costs, etc. can be reduced. .

  Further, in this embodiment, an annular groove portion 20 extending over the entire circumference in the circumferential direction with respect to the water supply pipe 12 is formed, and a plurality of through holes 26 arranged at predetermined intervals in the circumferential direction are formed in the groove portion 20. . For this reason, when installing the water supply pipe 12, even if the water supply pipe 12 is twisted or rotated, the groove 20 and the through-hole 26 always exist on the bottom side of the water supply pipe 12, and the Water supply will be made appropriately. That is, since the installation work can be performed without worrying about the circumferential position of the water supply pipe 12, the underground irrigation system 10 can be easily constructed.

  Furthermore, in this embodiment, since the water guide pipe 14 is inserted into the water supply pipe 12 and the water is guided to each groove portion 20 of the water supply pipe 12 by the water guide pipe 14, the water supply pipe 12 meanders in the vertical direction. Even if it is installed, water is reliably supplied to each groove portion 20 of the water supply pipe 12. For this reason, the underground irrigation system 10 is suitably used not only for cultivated land having a uniform inclination, but also for cultivated land with ups and downs (up and down). In particular, cultivated lands such as fields often have undulations even if they appear to be horizontal at first glance, so the effect of using the underground irrigation system 10 is great. Of course, the underground irrigation system 10 can also be suitably used for horizontal ground.

  The water supply pipe 12 also has a function of covering and protecting the water conduit 14, and since the water conduit 14 does not contact the soil, the through hole 30 of the water conduit 14 may be clogged with soil or sand. Absent. That is, the water conveyance function does not deteriorate due to clogging of the water conduit 14, and it is not necessary to clean or replace the interior of the water conduit 14. Therefore, the underground irrigation system 10 is easily maintained. .

  Moreover, the underground irrigation system 10 can be applied widely from a personal use to a large-scale one by appropriately changing the size and arrangement of the water supply pipe 12 according to the area of the cultivated land 100 and the like. For example, it can be used for a flower bed in a garden, and can be used for large-scale field farming or rice farming.

  FIG. 4 shows another example of the water supply pipe provided in the underground irrigation system 10. The water supply pipe 12 shown in FIG. 4 is the same as the water supply pipe 12 shown in FIG. 2 except that a penetrant 36 is provided on the water supply pipe 12 shown in FIG. And redundant descriptions are omitted or simplified.

  As shown in FIG. 4, a plurality of groove portions 20 are formed on the inner surface side of the water supply pipe 12 so as to be spaced apart in the axial direction, and each groove portion 20 has a plurality of grooves arranged at predetermined intervals in the circumferential direction. A through hole 26 is formed. Each of the through holes 26 is provided with a water permeable penetrating material 36. The penetrating material 36 sucks out the water in the groove 20 to the outside of the water supply pipe 12 (soil) by capillary action, is provided so as to fit into the through hole 26, and extends from the groove 20 to the outside of the water supply pipe 12. The penetrating material 36 is formed, for example, by twisting a plurality of fibers into a rod shape, or twisting a strip-shaped nonwoven fabric into a rod shape. Then, between the fibers forming the penetrating material 36 becomes a passage of water that moves due to capillary action. The material of the fibers forming the penetrating material 36 is not particularly limited, and for example, general fibers such as synthetic fibers such as polyester and polyamide, and natural fibers such as cotton and hemp can be used. The penetrating material 36 may be formed of a material other than fiber as long as it is a material that causes capillary action.

  In the water supply pipe 12 shown in FIG. 4, since the penetrating material 36 is provided in the through hole 26, intrusion of earth and sand, plant roots, and the like into the through hole 26 is prevented. Therefore, clogging of the through hole 26 of the water supply pipe 12 can be prevented, and maintenance of the underground irrigation system 10 becomes easier.

  In the embodiment shown in FIG. 1, the water guide pipe 14 is inserted into the water supply pipe 12, but the underground irrigation system 10 is applied to the cultivated land 100 having a uniform inclination (no undulation). In some cases, the water conduit 14 is not necessarily provided. In this case, the water distribution pipe 34 is connected to the upstream end of the water supply pipe 12, and the water from the water supply source 16 is directly supplied into the water supply pipe 12. As shown in FIG. 5, the water supplied into the water supply pipe 12 is supplied into the upstream groove portion 20, and part of the water overflows and is sequentially supplied into the downstream groove portion 20. And the water temporarily stored in the groove part 20 is gradually supplied to soil through the through-hole 26, and permeates around the water supply pipe 12 by a capillary phenomenon. When the water conduit 14 is omitted, the through-hole 26 provided in the groove 20 is formed to be small, and the water supplied from the water supply source 16 appropriately reaches the groove 20 on the downstream end side of the water supply pipe 12. To be done. Thus, further cost reduction of the underground irrigation system 10 can be achieved by omitting the water guide pipe 14.

  As another example of the underground irrigation system 10, as shown in FIG. 6, a water-impervious member 38 embedded under the water supply pipe 12 may be further provided. The water-impervious member 38 is a sheet or plate having a water-impervious property formed of a synthetic resin such as polyethylene and polyvinyl chloride, and regulates the movement of water supplied from the water supply pipe 12 to the soil. As an example, the water-impervious member 38 is disposed in a strip shape in a substantially horizontal direction so as to extend over the entire length of the water supply pipe 12, for example, at a distance of 10-50 mm away from the bottom of the water supply pipe 12. It will be launched along.

  By providing the water-impervious member 38 below the water supply pipe 12 in this way, the water supplied to the soil from the water supply pipe 12 is suppressed from moving downward and sideward, and easily moves upward as capillary water. . Accordingly, water can be supplied more efficiently to the plant rhizosphere. However, the water shielding member 38 may be disposed only in the substantially horizontal direction below the water supply pipe 12. If the water shielding member 38 is formed in a container shape or disposed over a wide area of the cultivated land 100, water may accumulate when there is rain, and root rot may occur. It is preferable to form a hole or the like in the water shielding member 38 that allows excessive water to flow downward.

  In each of the above-described embodiments, the groove portion 20 of the water supply pipe 12 is formed in an independent annular shape extending in the circumferential direction. However, the present invention is not limited to this, and a groove extending spirally along the pipe inner surface of the water supply pipe 12 is formed. However, the groove may be the groove portion 20. Moreover, the groove part 20 does not necessarily need to be formed over the entire circumference. The groove part 20 should just be formed in the bottom part of the water supply pipe 12 at least, and can also be formed in the circular arc shape extended over a part of circumferential direction, for example, the half of a circumferential direction, or 1/4. Further, for example, a groove portion 20 may be formed by arranging circular recesses in the axial direction, or a plurality of weir portions (for example, semicircular protrusions) that partition the lower portion of the inner space of the water supply pipe 12 at predetermined intervals in the axial direction. Part), and each portion partitioned by the dam portion may be the groove portion 20.

  In addition, when forming the groove part 20 in a part of the circumferential direction, as a mark at the time of installation of the water supply pipe 12, a protrusion, a groove, or the like is formed at the pipe outer surface position facing the circumferential center of the groove part 20, It is good to print logo marks. By providing such a mark, the water supply pipe 12 can be reliably installed so that the groove 20 is located at the bottom of the water supply pipe 12.

  Moreover, it is not necessary to form the groove portion 20 so as to repeat unevenness over the entire length of the water supply pipe 12 in the axial direction, and the groove portion 20 can be formed in a part of the water supply pipe 12 in the axial direction. That is, the groove portion 20 of the water supply pipe 12 only needs to be provided in a necessary place where irrigation is desired. The water supply pipe 12 is a plain pipe in which the groove portion 20 is not formed in addition to the wave-shaped portion where the groove portion 20 is formed. It may have a part. For example, the water supply pipe 12 may be formed by connecting a pipe having the groove 20 and a normal plain pipe. Further, the grooves 20 are not necessarily provided at regular intervals in the axial direction.

  Furthermore, since the groove part 20 should just be formed in the pipe inner surface side of the water supply pipe 12, the pipe outer surface side of the water supply pipe 12 may be formed smoothly. Further, only one through hole 26 may be formed in each groove 20. In this case, it is preferable to form a mark at the time of installation as described above at a position on the outer surface of the pipe facing the through hole 26.

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

DESCRIPTION OF SYMBOLS 10 ... Underground irrigation system 12 ... Water supply pipe 14 ... Water supply pipe 16 ... Water supply source 20 ... Groove part 26 ... Water supply pipe through-hole 30 ... Water guide pipe through-hole 36 ... Infiltration material 38 ... Water-impervious member 100 ... Cultivated land

Claims (5)

In cropland having an inclined, water flowing out from the holes of the water supply pipe is buried underground in a underground irrigation system for feeding subjected to soil rhizosphere of plants by the capillary phenomenon of soil,
The water pipe is
In the tube surface, formed on at least a portion of the circumferential direction, and a plurality of grooves arranged in the axial direction, and the respectively formed in the bottom of the groove comprises a plurality of said holes are arranged at predetermined intervals in the circumferential direction ,
The underground irrigation system in which the water supplied into the water supply pipe is distributed to each of the groove portions, and the water temporarily stored in the groove portions is gradually discharged into the soil from the holes . Wherein is inserted through the water supply pipe, e conduit further Bei directing water into said groove a plurality of through-holes or voids formed in the tube wall,
The axial interval for forming the through hole or the gap in the pipe wall of the water conduit is set equal to or less than the axial interval for forming the groove in the water supply pipe . Underground irrigation system.   The underground watering system according to claim 1 or 2, wherein the water supply pipe includes a penetrating material provided in each of the holes of the groove.   The underground irrigation system according to any one of claims 1 to 3, further comprising a water shielding member embedded under the water supply pipe. A water supply pipe that is used in the underground irrigation system according to claim 1 to supply water from the underground to the soil,
On the inner surface side of the tube, a plurality of grooves formed in at least a part of the circumferential direction and arranged in the axial direction, and formed in each of the bottoms of the grooves, and provided with a plurality of holes arranged at predetermined intervals in the circumferential direction ,
The size of the hole is set to a size that allows water supplied into the water supply pipe to reach the groove on the downstream end side of the water supply pipe.

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