JP2010029072A - Subirrigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a subirrigation system which utilizes the permeation function of the soil itself to cause no decrease in the permeation function due to clogging and thereby facilitate maintenance, and also controls the water level control of gravity water at the water-supply side to be free from supply of unnecessary water, and thereby enables the efficient use of water resource. <P>SOLUTION: The subirrigation system 10 includes a water-barrier member 16 to keep the water content of the soil of a cultivation land 200 in a suitable state for the growth of plants. The water-barrier member 16 is formed into a top-open container shape and given a water reserving function. The inside of the water-barrier member 16 is supplied with water from a water tank 12 via a water supply pipe 14, so as to form a soil portion 26 into a gravity water state. The water level 28 of the gravity water in the water-barrier member 16 is properly administered to be a desired one with a water level administrator 18 disposed in the water supply pipe 14. The gravity water inside the water-barrier member 16 which is administered to have the desired water level, is optionally sucked up into the soil at the upper layer by the capillary phenomenon. As a result, a capillary water-state soil portion 30 having the proper water content is formed in the cultivation land 200. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an underground irrigation system, and more particularly to, for example, an underground irrigation system that supplies water from the underground to keep the moisture content of the soil appropriate.

  An example of the prior art is disclosed in Patent Document 1. The technique of patent document 1 is a plant cultivation apparatus used when cultivating various plants in a home, and includes a water tank that accommodates cultivation water. The cultivation container which accommodates vegetation soil is provided in the upper part in an aquarium, and the water absorption body immersed in the cultivation water in an aquarium hangs down from the lower part of this cultivation container. Cultivation water is sucked up by the capillary action of the water-absorbing body and supplied to the vegetation soil.

Another example of the prior art is disclosed in Patent Document 2. The technology of Patent Document 2 is a water storage type soil system having a water level adjustment function. In the technique of Patent Document 2, a lawn pavement or the like is made into a water storage type by a water shielding sheet, and water from rain or water spray is collected without permeating underground by a culvert pipe laid on the water shielding sheet. The collected water is introduced into a water level adjusting tub having a water level adjusting function for each block, and the soil water is adjusted for each purpose by adjusting the groundwater level.
JP 2002-272275 A [A01G 9/02] JP-A-8-302800 [E03F 1/00]

  In the technique of Patent Document 1, impurities in cultivation water adhere to the surface of the water absorbent body, and the water absorbent body is clogged, so that the permeation function of the water absorbent body is significantly reduced over time. Therefore, in the technique of Patent Document 1, it is necessary to clean or replace the water absorbing body, which requires time and effort for maintenance. Moreover, the technique of patent document 1 is a technique applied to small things, such as a planter which grows a flower etc. in a household, and application to a large-scale field crop etc. is practically impossible.

  Moreover, in the technique of patent document 2, since water is collected using a culvert tube, soil particles and the like are easily accumulated in the hole of the culvert tube, and clogging is likely to occur. If the hole in the culvert tube is clogged, the water collecting function is greatly reduced. Therefore, in the technique of Patent Document 2, it is necessary to periodically clean the culvert tube, and maintenance is troublesome. The culvert tube is filled with a culvert filter material, but its specific configuration is not described at all, and its effect is unknown. For example, when crushed stone or gravel is used as a filter material for a culvert, soil particles pass through these gaps and the holes in the culvert tube are clogged. In addition, if a fine filter material for a culvert formed of fibers or the like is used, the culvert filter material itself may be clogged.

  Furthermore, in the technique of Patent Document 2, water is supplied to the soil by natural rainfall or watering, and the groundwater level is adjusted on the drainage side by a water level adjuster. In areas where natural rainfall tends to be insufficient, water is supplied to the soil by watering. However, if the supply of water to the soil is insufficient, the groundwater level cannot be maintained at the target water level. Technology tends to supply excess water. Excess water supplied is only discharged to the drain pipe, resulting in wasteful use of water resources.

  Therefore, the main object of the present invention is to provide a novel underground irrigation system.

  Another object of the present invention is to provide an underground irrigation system that is easy to maintain.

  Still another object of the present invention is to provide an underground irrigation system that can efficiently use water resources.

  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.

  1st invention is formed in the container shape of an upper side opening, the water-impervious member which has the soil part of a gravity water state in the inside, the water supply means which forms the soil part by supplying water inside the water-impervious member, and the soil part An underground irrigation system comprising a water level management means for stopping water supply by the water supply means when the water level of the gravitational water in the soil is equal to or higher than the set value and supplying water by the water supply means when the gravitational water level of the soil portion is less than the set value. is there.

  In the first invention, the underground irrigation system (10) includes a water-impervious member (16) and is applied to the cultivated land (200) or the like to keep the moisture content of the soil in an appropriate state for plant growth. The water shielding member is formed in a container shape having an upper opening and has a water storage function. The water supply means (12, 14) supplies water to the inside of the water shielding member. That is, when water is supplied by the water supply means, the water penetrates into the soil in the water-impervious member and becomes gravity water and remains in the water-impervious member. Thereby, the soil part (26) of a gravity water state is formed in the inside of a water-impervious member. Moreover, a water level management means (18) manages the water supply by a water supply means, and maintains the water level (28) of the gravity water of the soil part of a gravity water state to a desired water level. Gravity water in the soil portion in the gravitational water state is sucked up by the capillarity in the soil above it, and the amount of water in the soil above this varies depending on the level of gravity water. For this reason, by maintaining the water level of gravity water at an appropriate position using the water level management means, a capillary water state soil portion (30) having an appropriate amount of water can be formed on the cultivated land.

  According to the first invention, since the permeation function of the soil itself is used, the permeation function is not deteriorated due to clogging, and maintenance is facilitated. Moreover, since the water level management of gravity water is performed on the water supply side, useless water is not supplied and water resources can be used efficiently.

  A second invention is dependent on the first invention, and the water-impervious member is formed in a horizontal tubular shape having an opening on an upper surface thereof.

  In the second invention, the water-impervious member (16) is formed in a horizontal tubular shape, that is, a horizontally long container shape, and an opening is formed on the upper surface thereof. For example, one opening (98) that extends over the entire length of the water shielding member can be formed, or a plurality of openings can be formed at predetermined intervals.

  A third invention is dependent on the second invention, and the water shielding member includes a reinforcing portion for reinforcing the opening.

  In the third invention, the water-impervious member (16) is formed, for example, in a horizontal tube having a plurality of openings (98) by cutting the upper end of the tube wall at predetermined intervals, and the opening at the upper end of the tube wall. The part except for functions as a reinforcing part (112).

  According to the third invention, the shape of the water-impervious member can be maintained by the reinforcing portion. Therefore, the soil part of a gravity water state can be appropriately formed in the water shielding member.

  A fourth invention is dependent on any one of the first to third inventions, and the water supply means includes a water supply member for forming a water passage that passes through the water shielding member.

  In the fourth invention, the water supply means (12, 14) includes water supply members (90, 94, 114, 138). The water supply member forms a water channel (92) that passes through the water-impervious member (16), and water flowing through the water channel is supplied from the water supply member to the soil in the water-impervious member, so that the soil portion (26) in a gravity water state Form. For example, in the case of using a horizontally impermeable member, the water supply member forms a water channel over the entire inner length thereof. In addition, for example, when a plurality of water shielding members are connected in series, the water supply member forms a water channel that passes through the inside of the water shielding member and the water supply pipe (14, 22b).

  According to 4th invention, since water can be appropriately supplied in a water-impervious member, the soil part of a gravity water state can be formed appropriately in a water-impervious member.

  A fifth invention is dependent on the fourth invention, and the water supply member includes a pipe member provided inside the water shielding member.

  In 5th invention, a pipe member (90,114,138) is provided in the inside of a water-impervious member (16). For example, when a synthetic resin pipe having a large number of pores formed only at the lower end of the pipe wall is used as the pipe member, the pipe member mainly supplies the water in the water channel (92) downward. Accordingly, for example, when the roots of the plant enter the pores of the pipe member, the pores are not blocked, and the water in the water channel can be appropriately supplied into the water shielding member.

  A sixth invention is dependent on the fifth invention and further includes a connection member provided at at least one end of the water-impervious member, and the connection member connects the water-impervious member and the other water-impervious member, A pipe member and another pipe member are connected.

  In the sixth aspect of the invention, the connection member (110) is provided at the end of the water-impervious member (16), and this connection member and the other water-impervious member extend to the vicinity of both ends of the cultivated land (200). A water member is connected. For example, the connecting member includes a socket (116) and a relay pipe (118), receives the end of the water shielding member by the outer tube portion (120) of the socket, and by the inner tube portion (122) of the socket. The ends of the tube members (90, 114, 138) are received. The outer cylinder portion is formed in a cylindrical shape whose one opening is sealed by an outer cylinder stopper (124). The inner cylinder portion is formed in a cylindrical shape that penetrates the outer cylinder stopper, and an inner cylinder stopper (126) is formed on the inner peripheral surface thereof.

  According to 6th invention, even if it is a water-impervious member with a small length dimension, it can be extended to the vicinity of the both ends of cultivated land corresponding to the shape and range of cultivated land.

  A seventh invention is a double pipe unit used in the underground irrigation system according to any one of the first to sixth inventions and continuously provided in the ground of the cultivated land, and has a horizontal tube having an opening on the upper surface. A water-impervious member formed in the water-impervious member, a pipe member provided inside the water-impervious member, and provided at at least one end of the water-impervious member to connect the water-impervious member and another water-impervious member, It is a double pipe unit provided with the connection member which connects other pipe members.

  In the seventh invention, the double pipe unit is used in the underground irrigation system (10), and is connected to the ground of the cultivated land so as to extend to the vicinity of both ends of the cultivated land (200). The double pipe unit includes a water shielding member (16) formed in a horizontal tubular shape having an opening (110) on an upper surface thereof, and inside the water shielding member, pipe members (90, 114, 138) are provided. ) Is provided. Moreover, the connection member (110) is provided in the edge part of a water-impervious member. The connecting member connects the water shielding member and the other water shielding member, and connects the pipe member and the other pipe member.

  According to this invention, since the permeation function of the soil itself is used, the permeation function is not lowered due to clogging, and maintenance is facilitated.

  Moreover, since the water level management of gravity water is performed on the water supply side, useless water is not supplied and water resources can be used efficiently.

  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.

  Referring to FIG. 1, an underground irrigation system 10 (hereinafter simply referred to as “system 10”) according to an embodiment of the present invention includes a water tank 12, a water supply pipe 14, a water shielding member 16, and a water level controller 18. It is applied to cultivated land 200 and the like, and water is supplied from underground to keep moisture in the soil in an appropriate state for plant growth.

  The water tank 12 is installed on the ground and stores water to be supplied to the cultivated land 200. The water tank 12 is connected to, for example, an agricultural water pipe (not shown), and stores water sent from the agricultural water pipe therein. The amount of water stored in the water tank 12 is appropriately set depending on the area of the cultivated land 200 and the like, and a certain amount or more of water is always stored in the water tank 12. For example, when the water level in the water tank 12 falls below a certain water level, water may be automatically replenished from the agricultural water pipe, or water may be replenished appropriately by manually opening and closing the plug, etc. It may be.

  The water supply pipe 14 is a pipe line that sends water in the water tank 12 to the inside of the water shielding member 16, and includes a main pipe 20 connected to the water tank 12 and a branch pipe 22 branched from the main pipe 20. The branch pipe 22 further extends from the first branch pipe 22 a connected to the main pipe 20 and the first branch pipe 22 a to the water shielding member 16 and supplies water to the inside of the water shielding member 16. Includes tube 22b. The water supply pipe 14 is formed of a synthetic resin such as vinyl chloride and a metal such as SUS, and is formed by appropriately connecting a plurality of straight pipes, flexible pipes, joints, and the like.

  As shown in FIG. 2, the water-impervious member 16 is formed in a container shape having an upper opening and embedded in the ground by a material having water-impervious properties such as synthetic resin and metal. In this embodiment, the water shielding member 16 is formed in a bottomed cylindrical shape, and a plurality of (for example, 16) water shielding members 16 are distributed and arranged in the ground of the cultivated land 200. As the water-impervious member 16, for example, a general-purpose vinyl chloride VU pipe with a bottom attached with a cap or the like may be used. The inner diameter of the water shielding member 16 is, for example, 50 mm-500 mm, and the height thereof is, for example, 50 mm-300 mm. Moreover, the distance from the bottom face 16a of the water-impervious member 16 to the ground surface 202 is, for example, 100 mm-500 mm, and the interval between the respective water-impervious members 16 is, for example, 0.5 m-2.0 m. However, the size, the number of arrangement, the arrangement depth, the arrangement interval, and the like of the water shielding member 16 are not limited to these numerical values, and depend on the area of the cultivated land 200 to which the system 10 is applied, the soil components, the climatic conditions, and the like. Is set as appropriate. This is the same in other embodiments described later. For example, when it is not necessary to plow after planting trees or the like, the water-impervious member 16 can also be buried shallowly near the planting hole.

  Further, a connection port 24 is formed in the lower part of the side surface of the water shielding member 16, and the second branch pipe 22 b is connected to the connection port 24. Further, the water shielding member 16 is filled with soil composed of the same components as the surrounding soil. As will be described in detail later, when water is supplied from the second branch pipe 22b to the inside of the water shielding member 16, a soil portion 26 in a gravity water state is formed there.

  As described above, since the water shielding member 16 is formed in a container shape having an upper opening, the inside of the water shielding member 16 in this case is a concept included above the water shielding member 16. Moreover, the water-impervious member 16 is buried in the ground, so that it has soil on the upper side thereof, and also when the water-impervious member 16 is filled with soil, the upper side is also provided. Will have soil.

  The water supply pipe 14 is provided with a water level manager 18. As shown in FIG. 3, the water level manager 18 includes a vertical pipe 40 having a water storage function, and a management body 42 accommodated in the vertical pipe 40, and supplies water according to the water level in the vertical pipe 40. Is to adjust. In this embodiment, the water level controller 18 is provided on the main pipe 20 (that is, the water supply side), and as described in detail later, by adjusting the supply of water from the main pipe 20 to the branch pipe 22, The gravity water level 28 of the soil portion 26 in the gravity water state formed inside the member 16 is managed.

  The vertical tube 40 is formed in a bottomed cylindrical shape by a synthetic resin such as vinyl chloride. The upper part of the vertical pipe 40 is opened, and the main pipe 20 on the upstream side is inserted from the opening, and the main pipe 20 and the management device main body 42 are connected. In addition, a pipe connecting portion 44 is formed in the lower portion of the side wall of the vertical pipe 40, and the main pipe 20 on the downstream side is connected to the pipe connecting portion 44. Therefore, the laying height of the main pipe 20 changes before and after the water level controller 18.

  As the management device main body 42, the one proposed in Japanese Patent Application No. 2007-83825 filed earlier by the present applicant can be used.

  Specifically, the management device main body 42 includes a shaft portion 46, and the shaft portion 46 is formed in a straight tube shape by metal or synthetic resin. One end portion of the shaft portion 46 is a connection portion for connecting the main pipe 20 on the upstream side and the management device main body 42. The other end of the shaft portion 46 is used as a valve seat 48 that receives a valve body 60 described later, and the opening at the other end is used as a water supply port 50 that supplies water into the vertical tube 40.

  The management device main body 42 includes a shaft fixing tool 52 and a float 54, which are arranged around the shaft portion 46. The shaft fixing member 52 is formed in a flat plate shape using a synthetic resin or the like, and is attached to each of the upper portion and the lower portion of the shaft portion 46. The two shaft fixing portions 52 are arranged so as to extend in directions orthogonal to each other, and the shaft portions 46 are prevented from being inclined by abutting both end portions thereof along the inner surface of the vertical tube 40. Further, the upper shaft fixing portion 52 is provided with a length adjusting portion 56 for finely adjusting the length thereof.

  The float 54 is a buoy that is arranged above the water supply port 50 and rises and falls according to the fluctuation of the water level in the vertical tube 40, and is formed in a hollow ring shape by a synthetic resin such as vinyl chloride. The shaft portion 46 is inserted into the hole formed so as to penetrate the center portion of the float 54, and the float 54 moves (ascends and descends) along the shaft portion 46.

  In addition, a valve body 60 is connected to the float 54 via a link mechanism 58. The valve body 60 is disposed below the water supply port 50. When the float 54 rises, the valve body 60 comes into contact with the valve seat 48 to close the water supply port 50. When the float 54 descends, the valve body 60 moves away from the valve seat 48 and opens the water supply port 50. open. The valve body 60 is formed in a disc shape from a metal, a synthetic resin, or the like, and its upper surface is covered with an elastic material such as ethylene propylene rubber so that it can contact the valve seat 48 without a gap.

  The link mechanism 58 transmits the movement of the float 54 to the valve body 60, and links the movement of the float 54 and the movement of the valve body 60 opening and closing the water supply port 50. The link mechanism 58 is formed by combining a plurality of arms formed in the shape of a flat bar made of metal, synthetic resin, etc., and utilizes the principle of lever to amplify the force that the float 54 moves and transmit it to the valve body 60. . That is, by using the link mechanism 58, the valve body 60 and the valve seat 48 can be pressed with a strong force, and the water supply port 50 can be appropriately closed.

  When such a water level management device 18 is provided in the main pipe 20, first, the vertical pipe 40 is disposed in the ground, and the main pipe 20 on the downstream side is connected to the pipe connection portion 44 of the vertical pipe 40. Next, the management device main body 42 is placed in the vertical tube 40, and the position of the management device main body 42 is adjusted to a desired position (height) in the vertical tube 40. That is, when the water level in the vertical pipe 40 reaches a predetermined water level set value, the float 54 rises so that the valve body 60 contacts the valve seat 48 and the water supply port 50 is closed. The position of the main body 42 is adjusted. In this state, the length adjusting portion 56 is adjusted to increase the length of the upper shaft fixing portion 52, the shaft fixing portion 52 is stretched on the inner surface of the vertical tube 40, and the shaft portion 46 is extended to the vertical tube 40. By fixing it inside, the management device main body 42 is fixed at a desired position in the vertical tube 40. Further, the upstream main pipe 20 is connected to one end portion of the vertical pipe 40.

  In such a system 10, the water in the water tank 12 flows through the main pipe by natural flow using a water level difference between the water level in the water tank 12 and the water level in the vertical pipe 40 (for example, a water level difference of about 1 m). 20 and the shaft portion 46 are supplied into the vertical tube 40. The water supplied into the vertical pipe 40 is further supplied into the water shielding member 16 through the main pipe 20 and the branch pipe 22. Since the water-impervious member 16 is formed in a container shape having an upper opening, that is, has a water storage function, the water supplied to the inside of the water-impervious member 16 permeates into the soil inside the water-impervious member 16 and the gravity water. And stays inside the water shielding member 16. As a result, a soil portion 26 in a gravity water state is formed inside the water shielding member 16.

  The gravitational water level 28 in the soil portion 26, that is, the gravitational water level 28 in the water shielding member 16 is linked to the water level in the vertical pipe 40, and as the gravitational water level 28 rises, the vertical pipe 40. The water level inside rises. When the water level in the vertical pipe 40 reaches a predetermined water level set value, the water supply port 50 is closed, and water supply from the shaft portion 46 into the vertical pipe 40 is stopped. Thereby, the water supply into the water shielding member 16 is stopped, and the water level 28 of the gravity water stops at the same water level as the water level in the vertical tube 40, that is, a predetermined water level set value. Further, as will be described later, when the gravity water in the water shielding member 16 is sucked up by the upper soil and the water level 28 of the gravity water is lowered, the water level in the vertical pipe 40 is also lowered and the water supply port 50 is opened. The water supply from the shaft portion 46 into the vertical pipe 40 is performed, and the water supply into the water shielding member 16 is performed.

  In other words, the water level manager 18 closes the water supply port 50 and stops the water supply from the main pipe 20 to the branch pipe 22 when the gravity water level 28 in the water shielding member 16 becomes equal to or higher than the set value. When the water level 28 of the gravity water in 16 becomes less than the set value, the water supply port 50 is opened to supply water from the main pipe 20 to the branch pipe 22. Thus, the water level manager 18 manages the water supply into the water shielding member 16 and keeps the gravity water level 28 in the water shielding member 16 at the set water level.

  Gravity water in the water-impervious member 16, that is, moisture in the soil portion 26 is sucked and penetrated into the upper soil by capillary action to form the soil portion 30 in the capillary water state in the upper soil (FIG. 2). reference). The amount of water in the soil portion 30 in the capillary water state varies depending on the level of the gravitational water level 28 in the water shielding member 16. Therefore, if the gravitational water level 28 is maintained at an appropriate position, the soil portion in the capillary water state The water content of 30 can be kept appropriate. For example, if the water level 28 of gravity water is adjusted according to the plant cultivated on the cultivated land 200, a soil layer having an optimal amount of water for the plant is formed on the cultivated land 200.

  If the distance between the upper end 16b of the water shielding member 16 and the upper surface of the gravity water (that is, the position of the water level 28) is short, the gravity water may continue to flow out of the water shielding member 16 due to the siphon phenomenon. . According to experiments by the inventors of the present application, in order to effectively use the gravity water in the water shielding member 16 for the formation of the soil portion 30 in the capillary water state, the upper end 16b of the water shielding member 16 and the upper surface of the gravity water are The distance is desirably 3 cm or more, preferably 6 cm or more, and more preferably 16 cm to 20 cm. Therefore, the shape of the water shielding member 16 is preferably a structure in which the water level can be freely set between 3 cm and 20 cm.

  In this embodiment, the water content in the soil is maintained in an appropriate state for the growth of the plant by using the permeation function of the soil portions 26 and 30 themselves without using a permeation material such as a water absorbent. Since the soil portions 26 and 30 themselves are not clogged even if they become dry due to water shortage such as drought, the permeation function does not deteriorate due to clogging, and the soil in the water shielding member 16 is not clogged. There is no need to clean or replace. Therefore, according to this embodiment, maintenance management becomes easy.

  Moreover, when water is supplied to the cultivated land 200 by general watering using a sprinkler or the like, that is, surface irrigation, the supplied water will also moisten the soil surface and the plant surface, but these are not related to the growth of the plant. Since it only evaporates in the atmosphere (that is, surface evaporation), water is wasted. Moreover, since the soil becomes muddy, the work is hindered, and problems such as mud splashing and solidification of the soil surface are caused. 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, if water is supplied to the cultivated land 200 by infiltrating from the underground as in this embodiment, that is, if underground irrigation is performed, the surface of the supplied water will not evaporate. It can be reduced and water resources can be used efficiently. In addition, problems such as those described above caused by surface irrigation such as soil becoming muddy and excessive humidity in the house will not occur.

  Furthermore, in this embodiment, the water supply into the water shielding member 16 is managed on the water supply side, and only the amount of water that has been reduced due to the gravity water in the water shielding member 16 being sucked up by capillarity is supplied. In addition, excessive water is not supplied, and water resources can be used more efficiently. In addition, the efficient use of water resources in this way can also contribute to global warming countermeasures.

  Moreover, since the water supply to the impermeable member 16 is managed by the water level manager 18 and water is supplied to the soil by capillary action, no power is required. In addition, when excess water is supplied to the cultivated land 200 due to rain or the like, the surplus water penetrates deep into the ground, so there is no need to separately provide a facility for discharging the surplus water. Therefore, the system 10 can be simplified. However, when the system 10 is applied to the cultivated land 200 that is immediately submerged due to rain or the like, care must be taken and a separate drainage facility may need to be provided.

  It should be noted that when the soil is very dry, the capillary phenomenon is unlikely to occur. Therefore, at the start of cultivation, the soil should be sufficiently irrigated to create a state in which the capillaries are connected in advance.

  Further, when laying the water supply pipe 14 and the water-impervious member 16, it is only necessary to excavate only the laying portion, so that earthwork costs such as excavation and backfilling are compared with excavating the entire cultivated land 200. Can be reduced. Further, since it is not necessary to excavate the entire cultivated land 200, for example, when the system 10 is applied to land where trees are already planted, the water supply pipe 14 and the water shielding member 16 are laid between the trees. If so, the system 10 can be introduced as it is without planting trees, and the trees are not damaged.

  In addition, as plants become taller, they try to maintain their stability by stretching their roots deeply, but by adjusting the water level 28 of gravity water as appropriate, the depth (thickness) necessary for the plant is reached. Since the soil portion 30 in the capillary water state can be formed on the cultivated land 200, various plants can be suitably cultivated on the cultivated land 200.

  Moreover, if the whole underground surface is covered with a water-impervious sheet as in the technique of Patent Document 2, a large tree cannot stretch its roots deeply, and falls down or is adversely affected by its growth. Problems arise. However, if the water-impervious members 16 are arranged in a distributed manner as in this embodiment, such a problem is solved, and even a large tree whose roots are stretched deep into the ground can be cultivated suitably.

  Moreover, since the soil above the soil portion 26 in the gravitational water state can be appropriately maintained in the capillary water state, the water retention capacity is weak, so that rainwater or the like immediately penetrates deeply into the ground, so-called zaru rice fields or sandy land. Can also be suitably applied. In addition, it is possible to easily change the fields.

  Further, the system 10 can be widely applied from a personal use to a large-scale one by appropriately changing the size and the number of the water shielding members 16 according to the area of the cultivated land 200 and the like. For example, it can be used for garden flower beds, can be used for greening verandas, rooftops, etc., and can also be used for large-scale field and rice farming.

  In the above-described embodiment, the water shielding member 16 is connected in parallel to the water supply pipe 14 (specifically, the second branch pipe 22b). However, as shown in FIG. 16 can also be connected in series.

  As the water shielding member 16 in this case, as shown in FIG. 5, for example, a T-type pipe joint (specifically, 90 ° T, 90 ° Y, etc.) is provided at the lower end of a general-purpose vinyl chloride VU pipe. It is good to use what connected. As a result, the two connection ports 24 are formed in the lower part of the side surface of the water-impervious member 16, and thus the water-impervious member 14 is simply connected in series by connecting the second branch pipe 22 b to each connection port 24. be able to.

  However, if soil is filled in the water shielding member 16, the flow of water in the second branch pipe 22 b is blocked there, and there is a possibility that water cannot be supplied appropriately to the subsequent water shielding member 16.

  Therefore, in the embodiment shown in FIG. 4, each water shielding member 16 can be connected by the water supply pipe 14, but as shown in FIG. 5, the second branch pipe 22 b and the hole passing through the inside of the water shielding member 16. A tube 90 can also be provided. The perforated pipe 90 forms a water channel 92 that passes through the water-impervious member 16, and supplies the water flowing inside the water-impervious member 16 through a large number of pores formed in the pipe wall. A soil portion 26 in a gravity water state is formed in the member 16. That is, the perforated pipe 90 functions as a water supply member for forming the water channel 92 that passes through the water shielding member 16. At this time, the water level 28 of gravity water is managed so as to be higher than the pores of the perforated tube 90.

  In addition, if the water level 28 of gravity water is appropriately managed so as to be above the perforated tube 90, the perforated tube 90 is always filled with water and does not come into contact with air, so that iron oxide or the like hardly adheres. Further, the water flow goes from the inside of the perforated tube 90 to the outside. Therefore, in the embodiment shown in FIG. 5, the perforated tube 90 is less likely to be clogged as compared with the technique of Patent Document 2. That is, even if the perforated tube 90 is used, the maintenance burden is not so great.

  However, even if there is no water up to the upper end of the perforated pipe 90, if there is a certain water level in the perforated pipe 90, water is supplied from the circumferential surface of the perforated pipe 90. do not have to.

  Moreover, in the Example shown in FIG. 5, although the perforated pipe | tube 90 was used as a water supply member, it is not limited to this. For example, as shown in FIG. 6, by using a perforated plate 94 as a water supply member, a water channel 92 that passes through the inside of the water shielding member 16 and communicates with the inside of the adjacent second branch pipe 22b is formed. You can also. In this case, for example, when the T-type pipe joint is connected to the lower end portion of the VU pipe to form the water shielding member 16, the perforated plate 94 is sandwiched between the VU pipe and the pipe joint. It is good to provide. In the water shielding member 16, soil is filled on the perforated plate 94. And the water which flows through the water channel 92 is supplied to the soil in the water-impervious member 16 through a large number of pores formed in the perforated plate 94, so that the soil portion in the gravitational water state is contained in the water-impervious member 16. 26 is formed. In other words, the T-shaped pipe joint in this case also functions as a member that forms the water supply pipe 14 connected to the lower end of the vertical tubular water shielding member 16. The perforated plate 94 is a water supply member for forming the water channel 92 and also functions as a water permeable member for holding the soil portion 26 in the vertical tubular water shielding member 16.

  Also in the embodiment shown in FIG. 6, if the gravity water level 28 is appropriately managed so as to be above the perforated plate 94, that is, the soil portion 26 in the gravity water state is always formed in the water shielding member 16. If the state is maintained, similarly to the embodiment shown in FIG. 5, the perforated plate 94 is not easily clogged, and the maintenance burden is not so great.

  Further, in each of the above-described embodiments, one water level manager 18 is provided in the main pipe 20 of the water supply pipe 14, and the water level 28 of gravity water in all the water shielding members 16 is collectively managed. However, it is not limited to this. For example, the water level manager 18 may be provided in each of the first branch pipes 22a, and the water level 28 of gravity water may be managed for each of the plurality of water shielding members 16. The connecting method between each water level manager 18 and each first branch pipe 22a is only required to change the main pipe 20 in FIG. 3 to each first branch pipe 22a, and thus detailed description thereof is omitted. In this case, the laying height of each first branch pipe 22a changes before and after each water level manager 18, and the gravity in a plurality of water shielding members 16 provided downstream by each water level manager 18 is obtained. The water level 28 is managed collectively.

  In addition, as shown in FIG. 7, a water level manager 18 is provided for each second branch pipe 22 b, that is, for each water shielding member 16, and the water level 28 of gravity water in each water shielding member 16 can be individually managed. it can. In this case, a simple water level manager 18 as shown in FIGS. 8 and 9 may be used. In addition, about the part which overlaps with what was mentioned above, description is abbreviate | omitted or simplified. This is the same in other embodiments described later.

  The simplified water level management device 18 includes a vertical pipe 70 and is provided at an end portion of the water supply pipe 14 (second branch pipe 22b in this embodiment) to supply water according to the water level in the vertical pipe 70. To be adjusted. The vertical tube 70 is formed in a cylindrical shape with openings at both ends by a synthetic resin such as vinyl chloride, and its inner diameter is, for example, 40 mm. As the vertical tube 70, a general-purpose vinyl chloride VU tube may be used. Further, a water level setting tool 72 and a float 74 are provided inside the vertical pipe 70.

  The water level setting tool 72 is arranged in the vertical pipe 70 and defines the water level setting value in the vertical pipe 70 based on the arrangement height. The water level setting tool 72 is formed in a bottomed cylindrical shape, and its outer diameter is set to be substantially the same as the inner diameter of the vertical tube 70 to such an extent that it can be placed at a desired position (height) in the vertical tube 70. . A through hole 76 is formed on the bottom surface of the water level setting tool 70. As the water level setting tool 72, a general-purpose vinyl chloride cap can be used.

  Further, a through hole 78 is formed in the side wall of the vertical pipe 70 at a position higher than the water level setting tool 72. The end portion of the second branch pipe 22b passing through the underground from the through hole 78 is inserted into the vertical pipe 70, and the end portion of the second branch pipe 22b is further inserted into the through hole 76 of the water level setting tool 72 to It is fixed so as to protrude downward from the setting tool 72. The end of the second branch pipe 22 b functions as a valve seat 82 that comes into contact with the upper surface 80 of the float 74 described later, and the opening serves as a water supply port 84 for supplying water into the vertical pipe 70.

  The float 74 is disposed below the water level setting tool 72 and rises and falls according to the fluctuation of the water level in the vertical pipe 70, and its upper surface 80 is a valve body that abuts the valve seat 82 and closes the water supply port 84. Also works. The float 74 is formed in a hollow cylindrical shape by an elastic material such as rubber and a synthetic resin, and the outer peripheral surface thereof extends along the inner peripheral surface of the vertical tube 70 with a slight gap. That is, the float 74 is arranged in a state of being simply put in the vertical pipe 70 at a position below the water supply port 84 (the end of the water supply pipe 14), and moves while being guided by the vertical pipe 70. However, at least a portion that contacts the valve seat 82 on the upper surface 80 of the float that functions as a valve body needs to be formed of an elastic material such as rubber. This is because even when the rising force of the float 74 is weak, the upper surface 80 (valve element) of the float 74 and the end (valve seat 82) of the second branch pipe 22b are in contact with each other without gaps, so that the water supply port 84 is appropriately This is so that it can be closed. As the float 74, a polystyrene container for lactic acid bacteria beverages, a PET bottle or the like can be used, and an upper surface 80 which functions as a valve body by sealing the upper opening with an elastic material such as a rubber sheet. It is good to form.

  As described above, the simple water level manager 18 can be easily and inexpensively manufactured by combining only general-purpose products. As described above, instead of causing the end of the second branch pipe 22b to protrude from the through hole 76 formed in the bottom surface of the water level setting tool 72 and causing the end of the second branch pipe 22b itself to function as the valve seat 82, A cylindrical shaft portion having both end openings that project upward and downward is formed on the bottom surface of the water level setting tool 72, and the end of the second branch pipe 22b is connected to the upper portion of the shaft portion. You may do it. In this case, the lower end of the shaft portion corresponds to the end of the water supply pipe 14 and functions as a valve seat 82 that contacts the upper surface 80 of the float 74, and the lower end opening of the water supply port 84 supplies water into the vertical pipe 70. Function as. Further, instead of providing the through-hole 78 in the side wall of the vertical pipe 70 and inserting the second branch pipe 22b passing therethrough into the vertical pipe 70, the second branch pipe 22b is arranged along the ground surface 202. The second branch pipe 22b may be inserted into the vertical pipe 70 from the upper opening of the vertical pipe 70. Further, an appropriate lid may be attached to the upper opening of the vertical tube 70.

  An example of a method of providing such a simple water level manager 18 on the water shielding member 16 will be described. First, when the water-impervious member 16 is disposed in the ground, the soil is filled to a predetermined height in the water-impervious member 16, and the vertical pipe 70 is placed on the soil. Next, after putting the float 74 in the vertical tube 70, the water level setting tool 72 is fixed at a desired position (height) in the vertical tube 70. That is, when the water level in the vertical pipe 70 reaches a predetermined water level set value, the water level is set at such a position that the float 74 rises and its upper surface 80 comes into contact with the valve seat 82 and the water supply port 84 is closed. The tool 72 is fixed. Subsequently, the second branch pipe 22 b is inserted into the through hole 78 of the vertical pipe 70 and the through hole 76 of the water level setting tool 72, and the end of the second branch pipe 22 b is protruded below the vertical pipe 70 and fixed. Finally, the remainder inside the water shielding member 16 and the periphery thereof are filled with soil, and the vertical pipe 70 is fixed.

  The set water level is set by changing the embedment depth (arrangement height) of the vertical pipe 70 in the water shielding member 16 instead of changing the arrangement position of the water level setting tool 72 in the vertical pipe 70. You can also For example, when the water level setting tool 72 and the end portion of the water supply pipe 14 (water supply port 84) are fixed in advance in a predetermined position in the vertical pipe 70 and the vertical pipe 70 is arranged in the water shielding member 16, the arrangement is made. The set water level can be set to a desired position by appropriately adjusting the height. In this case, the water level setting tool 72 is not necessarily provided, and a fixing tool for fixing the water supply port 84 at a predetermined position in the vertical pipe 70 may be used.

  When the simple water level management device 18 is provided in each water shielding member 16 as described above, the water flowing through the second branch pipe 22b flows into the vertical pipe 70 as shown in FIG. It is supplied into the member 16. The water supplied into the water-impervious member 16 permeates through the soil and becomes gravity water and remains in the water-impervious member 16. As a result, the soil portion 26 in the state of gravity water is formed in the water shielding member 16. The water level 28 in the water-impervious member 16 and the water level in the vertical pipe 70 are the same. When the water level 28 reaches the set water level, as shown in FIG. It is closed and the water supply from the second branch pipe 22b into the vertical pipe 70 is stopped. Further, when the gravity water in the water shielding member 16 is sucked up by the upper soil and the water level 28 of the gravity water is lower than the set water level, the water supply port 84 is opened as shown in FIG. Water is supplied from the second branch pipe 22b into the vertical pipe 70.

  As described above, according to the embodiment shown in FIG. 7, the water level 28 of the gravitational water in each of the water shielding members 16 can be individually adjusted. For example, as shown in FIG. Alternatively, if the water level 28 of gravity water is changed for each of the plurality of water shielding members 16 arranged in the vicinity, the soil portion 30 in a capillary water state having a different moisture content for each place can be formed on the cultivated land 200. Therefore, in the same system 10, plants having different soil water content suitable for growth can be cultivated simultaneously in an optimal state. For example, in the cultivated land 200 of the same system 10, cabbage is cultivated in a certain range, soybeans are cultivated in another certain range, and trees are cultivated in another certain range.

  In FIG. 10, the water level 28 of the gravity water is individually changed by changing the height at which the water level setting tool 72 of the simplified water level management device 18 is provided. You may make it also change the embedment depth.

  In addition, the system 10 can be suitably applied to the cultivated land 200 having undulations, slopes, and the like on the ground surface 202 by individually adjusting the water level 28 of the gravity water. For example, as shown in FIG. 11, if the distance between the ground surface 202 and the upper surface of the gravitational water in each water-impervious member 16 is made constant at an optimum distance, the soil having the optimum amount of water for the plants cultivated there. The part 30 can be formed on the cultivated land 200 having undulations, slopes, and the like.

  Further, in each of the above-described embodiments, the plurality of water shielding members 16 are regularly arranged, but the water shielding members 16 may be irregularly arranged. Further, by arranging the water shielding member 16 uniformly throughout the cultivated land 200, the entire soil layer of the cultivated land 200 can be used as the soil portion 30 in the capillary water state, or a part of the cultivated land 200 can be used. By disposing the water-impervious member 16 in the range, only a partial range of the soil layer of the cultivated land 200, that is, only a range desired by the cultivator can be set as the soil water portion 30 in the capillary water state.

  Furthermore, not only the soil surface 30 in the capillary water state is formed up to the ground surface 202, but the ground surface 202 is in the dry state, but at the soil depth where the plant absorbs moisture, the soil water portion 30 in the capillary water state is It can also be in the state of being formed. In addition, as the plant grows, the water level 28 of gravity water is appropriately adjusted so that the soil water 30 in the capillary water state is formed at the necessary soil depth in the growth stage. You can also.

  Further, it is not always necessary to supply water corresponding to the upper and lower levels of the gravity water level 28. In some cases, such as soil conditions, water may be intermittently supplied to control the moisture in the soil portion 30 as appropriate.

  Moreover, although the soil component in the water-impervious member 16 is the same as the surrounding (external) soil component, the soil component in the water-impervious member 16 is not particularly limited. For example, as the soil component in the water-impervious member 16, soil particles having a particle diameter larger than or smaller than the surrounding soil components may be used. Moreover, the soil in the water-impervious member 16 can also be made into a multi-layered state, for example, forming a gravel layer, a sand layer, and a silt layer in order from the lower layer.

  In addition, as shown in FIG. 12, a hook-shaped member 96 may be further provided in the upper opening of the water shielding member 16. The eaves member 96 is formed of a material having a water shielding property such as a synthetic resin and a metal, and is formed so as to extend like a bowl from the side wall of the water shielding member 16. For example, as shown in FIG. 12 (A), the flange-like member 96 is formed in a ring shape whose inner side surface is along the outer side surface of the water-impervious member 16 by using a vinyl sheet or the like. Arranged at the top.

  As described above, the moisture of the soil portion 26 is sucked up by the capillarity to the upper soil and permeates into the upper portion of the water shielding member 16 and the surrounding soil, and the soil portion 30 in the capillary water state is absorbed. Form. Here, if the hook-shaped member 96 is provided in the water-impervious member 16, the hook-shaped member 96 blocks the penetration of water into the soil below it, so that the penetrating water penetrates in the lateral direction. . Thereby, the soil part 30 of the capillary water state which spreads widely in the horizontal direction can be formed. In this way, by reducing the amount of water that permeates downward using the bowl-shaped member 96, it is possible to form a capillary water state soil portion 30 that more efficiently spreads over a wide area. The amount of water to be reduced can be reduced.

  Note that the hook-like member 96 is only required to be provided so as to extend like a hook from the side wall of the water-impervious member in a plan view, and blocks water penetration into the soil below the hook-like member 96, for example, FIG. ), The outer peripheral portion can be formed to rise. Further, for example, as shown in FIG. 12C, the bowl-shaped member 96 may be formed in a funnel shape and inserted into the upper opening of the water shielding member 16. In FIG. 12, the hook-shaped member 96 is provided on the upper side wall of the water-blocking member 16, but the arrangement position (depth) of the hook-shaped member 96 is not limited to this. You may arrange | position in the side wall center part of the water-impervious member 16, and may arrange | position in the side wall lower part of the water-impervious member 16. Furthermore, the bowl-shaped member 96 may be formed in a dish shape, for example, and disposed below the water-impervious member 16. Thus, the soil part 30 of a capillary water state can be formed to desired depth by adjusting the arrangement position of the bowl-shaped member 96. FIG. Moreover, the water-impervious member 16 and the bowl-shaped member 96 may be integrally formed.

  Moreover, in each above-mentioned Example, although the water-impervious member 16 was formed in the bottomed cylindrical shape, the shape of the water-impervious member 16 does not need to be limited to this.

  For example, as shown in FIGS. 13 to 18, the water shielding member 16 may be formed in a horizontal tubular shape.

  For example, in the embodiment shown in FIG. 13, the water-impervious member 16 is formed in a horizontal tube shape having an opening 98 on the upper surface, and the water-impervious member 16 extending to the vicinity of both ends of the cultivated land 200 is separated by a predetermined interval. They are distributed in a line. The water shielding member 16 is, for example, a half pipe having a semicircular cross-sectional shape. As the half pipe, for example, two general-purpose vinyl chloride VU pipes having an inner diameter of 100 mm along the axial direction are provided. You can use what you cut.

  Thus, even if the water-impervious member 16 is formed in a horizontal tubular shape, the soil water 30 in the capillary water state can be appropriately formed by appropriately managing the water level 28 of the gravity water therein by the water level manager 18. . For example, a water level management device 18 is provided near the center of each water shielding member 16, and water is supplied into the water shielding member 16 from the second branch pipe 22b via the water level management device 18 as in the embodiment shown in FIG. And it is good to manage individually so that the water level 28 of the gravity water in each water-impervious member 16 may become a desired water level.

  Thus, if the water level 28 of the gravitational water in each water-impervious member 16 is individually managed, the system 10 can be suitably applied to terraced fields formed on slopes. It is not always necessary to individually manage the water level 28 of the gravitational water. Similar to the embodiment shown in FIG. 1, the water level manager 18 is provided in the main pipe 20 to control the water level 28 of all the water shielding members 16. The water level management device 18 may be provided in the first branch pipe 22a and the water level 28 of the gravity water may be managed for each of the plurality of water shielding members 16.

  Here, if the shape of the water shielding member 16 is too long in the lateral direction, the water supplied from the second branch pipe 22b does not permeate properly to the end in the water shielding member 16 and overflows from the upper part thereof. Therefore, there is a possibility that the soil part 26 in the gravity water state cannot be properly formed. Therefore, when the horizontal tubular water shielding member 16 is used, it is preferable to provide a water supply member inside the water shielding member 16 and form a water channel 92 passing through the inside of the water shielding member 16. For example, in the embodiment shown in FIG. 14 and FIG. 15, a perforated tube 90 extending in the axial direction along the bottom surface of the water shielding member 16 is provided inside the water shielding member 16. The perforated pipe 90 is connected to the second branch pipe 22b inside the water shielding member 16, and the water sent from the second branch pipe 22b is passed through a large number of pores formed in the pipe wall. The water is supplied into the water shielding member 16. By using such a perforated pipe 90, even when the water shielding member 16 is formed in a horizontally long shape, water can be appropriately permeated to the end in the water shielding member 16, and the water shielding member 16 The soil part 26 in a gravity water state can be appropriately formed therein.

  Further, as shown in FIG. 16, a water shielding member 16 may be formed by connecting rectangular side plates in the vertical direction to both side edges in the circumferential direction of the half pipe.

  Furthermore, as shown in FIG. 17, instead of the perforated pipe 90, a water channel 92 may be formed at the bottom of the water shielding member 16 by providing a perforated plate 94 in the lower part of the water shielding member 16. For example, when the water shielding member 16 is formed by connecting a side plate to the half pipe, a rectangular perforated plate 94 may be provided so as to be sandwiched between the half pipe and the side plate. Also in this case, the gravity water level 28 is appropriately managed so as to be above the perforated plate 94.

  In the embodiment shown in FIGS. 13 to 15, the half pipe is used as the horizontal tubular water shielding member 16 having the opening 98 on the upper surface, but the invention is not limited to this. For example, as shown in FIG. 18, as the water shielding member 16, use is made of a general-purpose vinyl chloride VU pipe whose upper end is cut out over the entire length in the pipe axis direction and provided with an opening 98. You can also.

  In order to maintain the gravity water level 28 above the perforated pipe 90 or to maintain the distance between the upper end 16b of the water shielding member 16 and the upper surface of the gravity water at a predetermined interval or more, the water shielding member 16 needs to have a certain height. Here, when the water-impervious member 16 (see FIG. 15) formed by only the half pipe is used, there is an advantage that the manufacture of the water-impervious member 16 itself is easy, but the lateral width becomes large. . However, if the water-impervious member 16 of the embodiment shown in FIGS. 16 to 18 is used, the height can be secured while suppressing the lateral width.

  By the way, in the embodiment shown in FIGS. 13 to 18, the water shielding member 16 is formed in a horizontal tube having an opening 98 on the upper surface, and both ends of the water shielding member 16 extend to the vicinity of both ends of the cultivated land 200. However, it need not be limited to this.

  In another embodiment of the present invention shown in FIG. 19, a connection member 110 is provided at the end of the water shielding member 16, and the water shielding member 16 and the other water shielding member 16 are connected by the connection member 110. .

  As shown in FIGS. 20 and 21, as the water shielding member 16 in this case, for example, an upper end portion of a general-purpose vinyl chloride VU pipe having an inner diameter of 100 mm is cut at predetermined intervals in the pipe axis direction. A device provided with a plurality of openings 98 is used. The length of the water shielding member 16 in the axial direction is, for example, 2000 mm. A portion excluding the opening 98 at the upper end portion of the pipe wall of the water shielding member 16 functions as a reinforcing portion 112 for reinforcing the opening 98. In other words, the reinforcing portion 112 is provided at a predetermined interval on the upper end portion of the pipe wall of the water shielding member 16.

  In addition, a pipe member 114 is provided inside the water shielding member 16 as a water supply member. As the pipe member 114, for example, a general-purpose vinyl chloride VU pipe having a large number of pores formed only at the lower end of the pipe wall is used. The pipe member 114 mainly supplies water in the water channel 92 downward. The inner diameter of the pipe member 114 is, for example, 50 mm, and the axial length of the pipe member 114 is, for example, 2000 mm.

  The connecting member 110 includes two sockets 116 having the same shape and one relay pipe 118. As shown in FIGS. 21 to 23, the socket 116 includes an outer cylinder part 120 and an inner cylinder part 122, and receives the end of the water shielding member 16 by the outer cylinder part 120, and a tube member by the inner cylinder part 122. 114 end is received. That is, the position of the pipe member 114 inside the water shielding member 16 is fixedly held by the connecting member 110.

  The outer cylinder part 120 is formed in a cylindrical shape whose one opening is sealed by an outer cylinder stopper 124, and the inner diameter thereof is appropriately set according to the outer diameter of the water shielding member 16, and is 115 mm, for example.

  The inner cylinder portion 122 is formed in a cylindrical shape penetrating the outer cylinder stopper 124, and the inner diameter thereof is appropriately set according to the outer diameter of the tube member 114, and is, for example, 60 mm. For example, a gap that is equal to or slightly larger than the thickness of the pipe wall of the water shielding member 16 is formed between the outer peripheral surface of the lower end portion of the peripheral wall of the inner cylindrical portion 122 and the inner peripheral surface of the lower end portion of the peripheral wall of the outer cylindrical portion 120. The end portion of the water shielding member 16 is fitted into this gap. An inner cylinder stopper 126 having a width substantially equal to that of the outer cylinder stopper 124 is formed on the inner peripheral surface of the inner cylinder portion 122 on the same plane as the outer cylinder stopper 124. The inner cylinder part 122 is partitioned into a first opening 128 that opens on the opening surface side in the outer cylinder part 120 and a second opening 130 that opens on the outer cylinder stopper 124 side in the outer cylinder part 120.

  The relay pipe 118 has a diameter substantially equal to that of the pipe member 114, and connects the sockets 116 by being inserted into the second opening 130 of the inner cylinder portion 122.

  An example of a method of configuring the water shielding member 16 that extends to the vicinity of both ends of the cultivated land 200 using such a connecting member 110 will be described. First, the pipe member 114 is provided inside the water-impervious member 16, and the connecting member 110 is attached to the end portions thereof to constitute a double pipe unit. Specifically, the end portion of the water shielding member 16 is inserted into the outer tube portion 120 of the socket 116 and pushed in until it is locked by the outer tube stopper 124, and the end of the tube member 114 in the water shielding member 16 is also inserted. Part is inserted into the first opening 128 in the inner cylinder part 122 of the socket 116 and pushed in until it is locked by the inner cylinder stopper 126. Next, as shown in FIG. 24, this double pipe unit is continuously provided in the ground of the cultivated land 200 so as to extend to the vicinity of both ends of the cultivated land 200. Specifically, the second opening 130 in the inner cylindrical portion 122 of the socket 116 provided at the end portion of the water shielding member 16 and the inner cylindrical portion 122 of the socket 116 attached to the end portion of the other water shielding member 16. The relay pipe 118 is inserted so as to straddle the second opening 130 and is pushed in until it is locked to the inner cylinder stopper 126 of each socket 116. This is repeated until the water shielding member 16 extends to the vicinity of both ends of the cultivated land 200.

  In this embodiment, a connection member 110 is provided at the end of the water shielding member 16, and the water shielding member 16 and a pipe member 114 (water supply member) provided therein are appropriately connected by the connection member 110. For this reason, even the water shielding member 16 having a small length can be extended to the vicinity of both ends of the cultivated land 200 in correspondence with the shape and range of the cultivated land 200. Therefore, compared with the case where the impermeable member 16 having a large length is moved to the site, the immobilization member 16 can be easily moved to the site and the workability is excellent.

  Further, in this embodiment, the position of the pipe member 114 inside the water shielding member 16 is fixedly held by the connecting member 110. For this reason, even if a synthetic resin pipe in which a large number of pores are formed only at the lower end of the pipe wall is used as the pipe member 114, the pores on the lower surface of the pipe member 114 and the pipe bottom of the water shielding member 16 are used. A gap is formed between the inner circumferential surface and the water in the water channel 92 can be appropriately supplied into the water shielding member 16.

  Further, in this embodiment, a synthetic resin pipe having a large number of pores formed only at the lower end of the pipe wall is used as the pipe member 114, and the pipe member 114 mainly supplies water in the water channel 92 downward. . For this reason, for example, the roots of the plant extending toward the water supply source enter the pores for supplying water in the water channel 92 so that the pores are not blocked, and the water in the water channel 92 is not blocked. Can be appropriately supplied into the water shielding member 16.

  Furthermore, in this embodiment, the water shielding member 16 is provided with a reinforcing portion 112 for reinforcing the opening 98. For example, when the opening 98 is provided in the water-impervious member 16 over the entire length of the upper end portion of the pipe wall, the water-impervious member 16 is deformed by earth pressure from its surroundings or its own stress, and the opening 98 is closed. It is also possible. However, by providing the reinforcing portions 112 at predetermined intervals on the upper end portion of the pipe wall of the water shielding member 16 as in this embodiment, the shape of the water shielding member 16 can be maintained. Therefore, the soil portion 26 in the gravity water state can be appropriately formed in the water shielding member 16.

  Further, in this embodiment, a circular pipe having both ends open, that is, a general-purpose synthetic resin pipe is used for the water shielding member 16 and the pipe member 114. Thus, by providing versatility to the water-impervious member 16 and the pipe member 114, it leads to the reduction of the kind of product and the amount of inventory, and the efficiency of production, and it is excellent in economical efficiency.

  In the above-described embodiment, the upper end portion of the pipe wall of the water shielding member 16 is cut out at predetermined intervals, and the portion excluding the opening 98 functions as the reinforcing portion 112. What is necessary is just to provide the reinforcement part 112 for reinforcing the opening 98 in the water member 16. For example, as shown in FIGS. 25 and 26, the upper end of the pipe wall is blocked by a VU pipe having an opening 98 extending over the entire length in the pipe axis direction, and a reinforcing member 112 of another member attached to the VU pipe. The water member 16 can also be formed. The reinforcing part 112 is formed on a substantially short cylinder having a recessed part 132 in a part of its peripheral wall, and the recessed part 132 is fitted into the opening 98 to maintain the shape of the water shielding member 16.

  Further, in the above-described embodiment, the socket 116 formed so that the outer cylinder stopper 124 of the outer cylinder portion 120 and the inner cylinder stopper 126 of the inner cylinder portion 122 are located on the same plane is shown, but the present invention is not limited thereto. There is no need to be done.

  For example, in the socket 116 shown in FIG. 27 and FIG. 28, the outer cylinder stopper 124 of the outer cylinder portion 120 and the opening surface of the second opening 130 of the inner cylinder portion 122 are formed on the same plane. The inner cylinder stopper 126 is disposed within a range between the opening surface of the outer cylinder portion 120 and the outer cylinder stopper 124. Further, the outer cylinder stopper 124 is formed with a holding portion 134 that extends in the axial direction with the outer cylinder portion 120. For example, a gap that is equal to or slightly larger than the thickness of the pipe wall of the water shielding member 16 is formed between the holding portion 134 and the inner peripheral surface of the upper end portion of the peripheral wall of the outer cylinder portion 120. The end of the member 16 is fitted. That is, the end portion of the water-impervious member 16 is not only in the gap between the inner peripheral surface of the outer cylindrical portion 120 and the outer peripheral surface of the inner cylindrical portion 122 but also in the gap between the inner peripheral surface of the outer cylindrical portion 120 and the holding portion 134. It is inserted.

  Here, when the insertion amount of the pipe member 114 with respect to the inner cylinder portion 122 is insufficient, there is a possibility that the water channel 92 may not be formed properly. Therefore, at least the end of the pipe member 114 is locked to the inner cylinder stopper 126. It is necessary to push into the inner cylinder part 122 until it is done. For this reason, when the outer cylinder stopper 124 and the inner cylinder stopper 126 are formed on the same plane, the length dimension of the water shielding member 16 is adjusted so as to be substantially equal to the length dimension of the pipe member 114. There must be.

  On the other hand, in the socket 116 shown in FIGS. 27 and 28, the inner cylinder stopper 126 of the inner cylinder portion 122 is disposed between the opening surface of the outer cylinder portion 120 and the outer cylinder stopper 124. The end portion of the water shielding member 16 can be fitted into the gap between the inner peripheral surface of the outer cylindrical portion 120 and the outer peripheral surface of the inner cylindrical portion 122 and the gap between the inner peripheral surface of the outer cylindrical portion 120 and the holding portion 134. . For this reason, the allowable range of the insertion amount of the water-impervious member 16 with respect to the outer cylindrical portion 120 is expanded, and at least the end portion of the pipe member 114 can be pushed into the inner cylindrical portion 122 until the inner cylindrical stopper 126 is locked. For example, the length dimension of the pipe member 114 and the length dimension of the water-impervious member 16 may be either larger or smaller than the other as long as there is no significant difference. Therefore, it is not necessary to adjust the length dimension of the water shielding member 16 in detail.

  Further, in the above-described embodiment, the water shielding member 16 is connected by the connection member 110 including the two sockets 116 having the same shape and the one relay pipe 118, but the water shielding member 16 is not necessarily limited thereto.

  For example, the connecting member 110 shown in FIGS. 29 and 30 includes a first socket 116a and a second socket 116b having different shapes, and connects the water shielding member 16 and the pipe member 114 without using the relay pipe 118. can do.

  As shown in FIG. 29, the first socket 116a has a shape in which the outer cylindrical portion 120 in the socket 116 shown in FIG. 27 is removed. In the second socket 116b, the outer cylindrical portion 120 removed by the first socket 116a is formed integrally with the outer cylindrical portion 120 of the socket 116 shown in FIG. It has an integrally formed shape. As shown in FIG. 30, according to such a connection member 110, the first socket 116 a attached to the end portion of the water shielding member 16 and the second socket 116 b attached to the end portion of the other water shielding member 16 are provided. By combining these, each of the water shielding member 16 and the pipe member 114 can be connected.

  Further, for example, as shown in FIGS. 31 and 32, the water shielding member 16 can be connected by a connecting member 110 including a single socket 116.

  The socket 116 shown in FIGS. 31 and 32 includes an outer cylinder portion 120 and an inner cylinder portion 122. The outer cylinder portion 120 receives the end portion of the water shielding member 16, and the inner cylinder portion 122 allows the end of the pipe member 114 to be received. Accept the department. The outer cylinder portion 120 is formed in a cylindrical shape whose substantially central portion in the axial direction is closed by an outer cylinder stopper 124. For example, the length in the axial direction is 100 mm, and the inner diameter thereof is a water shielding member. It is set appropriately according to the outer diameter of 16, for example, 115 mm. The inner cylinder part 122 is formed in a cylindrical shape that penetrates the outer cylinder stopper 124 in the outer cylinder part 120, and its axial length is 50 mm, and its inner diameter is appropriately set according to the outer diameter of the tube member 114. For example, 60 mm. On the inner peripheral surface of the inner cylinder portion 122, an inner cylinder stopper 126 that protrudes toward the center of the inner cylinder portion 122 is formed on the same plane as the outer cylinder stopper 124.

  As shown in FIG. 33, the outer cylinder stopper 124 of the socket 116 can be formed with a communication portion 136 that allows the one opening and the other opening of the outer cylinder portion 120 to communicate with each other. In this case, the water inside the water-impervious member 16 can be moved between the adjacent water-impervious members 16 connected by the socket 116 (connecting member 110) via the communication portion 136. .

  Further, as shown in FIG. 34, the axial length of the outer cylindrical portion 120 of the socket 116 and the axial length of the inner cylindrical portion 122 may be made to correspond to each other.

  Further, in the socket 116 shown in FIGS. 31 to 34, the outer cylinder stopper 124 of the outer cylinder portion 120 and the inner cylinder stopper 126 of the inner cylinder portion 122 are formed with substantially the same width on the same plane. There is no need to be done. For example, as shown in FIG. 35, by forming the inner cylinder stopper 126 of the inner cylinder portion 122 to be long in the axial direction, the portion of the inner cylinder stopper 126 that locks the end portion of the tube member 114 is changed to the outer cylinder portion 120. It can also be arranged between the opening surface of this and the outer cylinder stopper 124. Even in this case, as described above, it is not necessary to adjust the length dimension of the water shielding member 16 in detail, so that the workability is excellent.

  Similarly, as shown in FIG. 36, in the socket 116 in which the axial lengths of the outer cylinder portion 120 and the inner cylinder portion 122 correspond, the inner cylinder stopper 126 of the inner cylinder portion 122 is axially moved. By forming the length of the inner cylinder stopper 126 long, the portion of the inner cylinder stopper 126 that locks the end of the tube member 114 can be disposed between the opening surface of the outer cylinder portion 120 and the outer cylinder stopper 124.

  Furthermore, in the above-described embodiment, the synthetic resin pipe having a large number of pores formed only at the lower end portion of the pipe wall is used as the pipe member 114, but it is not necessary to be limited to this.

  For example, the perforated tube 90 as described above may be used as the tube member 114.

  For example, as shown in FIG. 37, a water guide portion 138 formed integrally with the water shielding member 16 can be used as the pipe member 114. The water guide portion 138 includes a cylindrical portion 140 that forms the water channel 92 and a support portion 142 that supports the cylindrical portion 140.

  The cylindrical portion 140 has, for example, a substantially cylindrical shape in which a gap 144 is formed at the lower end portion of the peripheral wall, and the water in the water channel 92 is supplied downward through the gap 144. The support portion 142 is formed in a plate shape that protrudes upward from the lower end portion of the pipe wall of the water shielding member 16, and connects the inner peripheral surface of the cylindrical portion 140 and the inner peripheral surface of the water shielding member 16 through the gap 144. It connects and fixes the position of the cylindrical part 140 within the water-impervious member 16.

  In this embodiment, the water shielding member 16 and the water guiding portion 138 (pipe member 114) are integrally formed. Therefore, the piping work in the underground irrigation system 10 can be reduced and the workability can be improved.

  When the water shielding member 16 and the pipe member 114 are integrally formed as in this embodiment, as shown in FIGS. 38 and 39, the first opening in the inner cylindrical portion 122 of the socket 116 is used. A notch 146 may be formed at the lower end of the cylinder wall on the 128 side over the entire axial length, and the support 142 may be inserted through the notch 146.

  Moreover, although the cylindrical part 140 in the water conveyance part 138 was formed in the substantially cylindrical shape by which the space | gap 144 was formed in the lower end part of a surrounding wall, it is not necessary to be limited to this, The water channel 92 formed by the cylindrical part 140 As long as the water can be supplied downward through the gap 144, the shape of the water guiding portion 138 is not particularly limited.

  For example, as shown in FIG. 40, the tubular portion 140 in the water guide portion 138 can be formed in a substantially rectangular tubular shape in which a gap 144 is formed at the lower end portion of the peripheral wall.

  For example, as shown in FIG. 41, a cylindrical portion 140 having a substantially cylindrical shape with a gap 144 formed at the lower end portion of the peripheral wall is formed at the upper end of the support portion 142, thereby forming a so-called question mark shape. The water guide portion 138 can also be formed inside the water shielding member 16.

  Furthermore, for example, as shown in FIG. 42, by bending the opening edge at the upper end portion of the pipe wall of the water shielding member 16 inward, a gap 144 is formed between the opening edge of the water shielding member 16 and the inner peripheral surface. The water guide portion 138 to be formed can also be formed inside the water shielding member 16.

  Furthermore, in the above-described embodiment, the cylindrical portion 140 and the support portion 142 are integrally formed, but it is not necessary to be limited to this. Although illustration is omitted, the tubular portion 140 and the support portion 142 in the water guiding portion 138 may be configured as separate bodies.

  As another embodiment, as shown in FIGS. 43 and 44, the water shielding member 16 can be formed using a water shielding sheet formed of rubber, synthetic resin, or the like.

  Specifically, in the embodiment shown in FIGS. 43 and 44, the sheet-shaped water shielding member 16 is laid under the cultivated land 200 so as to spread over the entire surface of the cultivated land 200. The end of the sheet-like water-impervious member 16 is raised, whereby the water-impervious member 16 is formed in a container shape with an upper opening. However, when the periphery of the cultivated land 200 is a water-impermeable layer by another means, such as clay, or when a water-impervious sheet having a sufficient size (width) is used, a sheet-like water-impervious sheet is used. It is only necessary to provide the member 16 in the horizontal direction. The laying depth of the horizontal water shielding member 16, that is, the bottom surface of the water shielding member 16, is, for example, 300 to 500 mm.

  Even if water is supplied from the water tank 12 through the water supply pipe 14 to the inside (or the upper side) of such a water shielding member 16, the soil portion 26 in a gravity water state can be formed there. And the soil part 30 of a capillary water state can be formed appropriately by managing the water level 28 of gravity water appropriately by the water level management device 18. 43 and 44 also utilize the permeation function of the soil itself, so that the permeation function does not deteriorate due to clogging, and maintenance is easy. Moreover, since the water level management of gravity water is performed on the water supply side, useless water is not supplied and water resources can be used efficiently.

  In addition, the sheet-like water-impervious member 16 is not necessarily provided on the entire surface of the cultivated land 200, and can be formed in a part of the cultivated land 200, or distributed as in the embodiment shown in FIG. It can also be arranged. However, when the water-impervious member 16 is formed by the water-impervious sheet, the water-impervious sheet is likely to be worn out, so that water in the water-impervious member 16 leaks, making it difficult to appropriately control the water content of the soil portion 30. There is a possibility. Further, when the sheet-shaped water shielding member 16 is provided on the entire surface of the cultivated land 200, excess water due to rain or the like cannot penetrate deep underground, so it is necessary to provide a separate drainage facility, and further, roots are deep underground. In some cases, it is not possible to properly cultivate large trees that stretch up to a maximum.

  Further, in each of the above-described embodiments, the water tank 12 is connected to an agricultural water pipe or the like and stores water sent therefrom, but is not limited thereto. For example, in the case of a small-scale system 10 used for personal use, a farmer (user) may refill water in the water tank 12 as appropriate using a bucket or the like. Further, for example, a configuration in which rainwater is appropriately stored in the water tank 12 may be adopted. Furthermore, the water tank 12 is not necessarily provided, and water can be directly supplied to the water supply pipe 14 from an agricultural water distribution pipe or the like.

  Further, the piping structure of the water supply pipe 14 is appropriately changed in accordance with the arrangement of the water shielding member 16 and the like. For example, the water supply pipe 14 may be formed only by the main pipe 20 or from the second branch pipe 22b. A third branch pipe that branches may be further formed.

  Further, in the embodiment shown in FIG. 1, a water level manager 18 as shown in FIG. 3 is used, and in the embodiment shown in FIG. 7, a simplified water level manager 18 as shown in FIG. 8 is used. It is not limited to. The water level management device 18 shown in FIG. 3 or FIG. 8 can be used in any embodiment, and the water level management device 18 other than the water level management device 18 shown in FIG. 3 or FIG. You can also. However, compared with the water level management device 18 shown in FIG. 3, the simplified water level management device 18 shown in FIG. 8 has a weak force for closing the water supply port 84, so that the water sent from the water supply pipe 14 is low-pressure water. Only in this case, the simplified water level manager 18 shown in FIG. 8 can be used.

  The simple water level manager 18 shown in FIG. 8 can be easily and inexpensively manufactured, and is optimal when used when the system 10 is applied to a small-scale cultivated land 200. For example, as shown in FIG. 45, when the system 10 is applied to a planter 204 disposed outdoors, one water shielding member 16 is embedded in the cultivated land 200 in the planter 204 (that is, the soil in the planter 204). One simple water level manager 18 may be provided in the water shielding member 16. A water supply pipe 14 connected to the water tank 12 is connected to the water level manager 18. And if the soil part 26 of a gravitational water state is formed in the water-impervious member 16 and the water level 28 of the gravitational water is appropriately maintained as in the above-described embodiments, the upper part of the soil in the planter 204 is formed. The soil part 30 in a capillary water state can be formed, and plants such as flowers can be cultivated appropriately. In this case, even if surplus water is given into the planter 204 due to rain or the like, the water drains from a hole 206 formed in advance on the bottom surface of the planter 204. That is, in the embodiment shown in FIG. 1 and the like, the same action as that of surplus water permeating deep underground works.

  Moreover, in each above-mentioned Example, although the water-impervious member 16 was embed | buried under the ground (in the soil), the water-impervious member 16 does not necessarily need to be embed | buried under the ground. For example, as shown in FIG. 46, the planter 204 or the pot itself is used as the water-impervious member 16 to grow flowers and the like in the soil portion 30 in the capillary water state formed in the upper layer portion of the soil in the water-impervious member 16. Good.

  Specifically, the system 10 may be applied to a planter 204 or the like disposed indoors. In this case, the planter 204 itself functions as the water shielding member 16. However, it is necessary to seal the hole 206 formed in the bottom surface of the planter 204 with an appropriate sealing tool 208 such as a cap so that the planter 204 has a water storage function. One water level manager 18 is provided in the planter 204, that is, in the water-impervious member 16, and a soil portion 26 in a gravity water state is formed in the water-impervious member 16 as in the embodiment shown in FIG. The In this case, the water level 28 of the gravitational water may be kept at the middle of the soil in the water-impervious member 16, and thereby the soil portion 30 in the capillary water state is formed on the upper layer of the soil in the water-impervious member 16. Is formed. Since the embodiment shown in FIG. 46 is applied to the planter 204 disposed indoors, it is not necessary to consider a state in which excessive water is supplied due to rainfall or the like.

  In addition, for example, when the system 10 is applied to rooftop greening, a water shielding member 16 having an appropriate size is disposed on the roof, and the upper layer of soil in the water shielding member 16 is the same as the embodiment shown in FIG. The soil part 30 of a capillary water state is formed in a part, and it is good to grow a plant in the soil part 30. However, when applied outdoors, it is necessary to provide an appropriate drainage facility separately.

  Moreover, the system 10 can also be comprised combining the water-impervious member 16 shown in each Example. For example, the water shielding member 16 shown in FIG. 2, the water shielding member 16 shown in FIG. 15, the water shielding member 16 shown in FIG. 21, and the water shielding member 16 shown in FIG. 37 may be applied in the same system. Further, for example, the water-impervious member 16 shown in FIG. 2 may be disposed on the sheet-like impermeable member 16 to form the two-layered soil water portion 30 in the capillary water state.

It is an illustration figure which shows one Example of the underground irrigation system of this invention. It is a schematic sectional drawing which shows the mode of the impermeable member periphery of the underground irrigation system of FIG. It is a schematic sectional drawing which shows the mode of the water level management device periphery of the underground irrigation system of FIG. It is an illustration figure which shows the other Example of the underground irrigation system of this invention. It is a schematic sectional drawing which shows an example of the mode of the impermeable member periphery of the underground irrigation system of FIG. It is a schematic sectional drawing which shows another example of the mode of the impermeable member periphery of the underground irrigation system of FIG. It is an illustration figure which shows the further another Example of the underground irrigation system of this invention. It is a schematic sectional drawing which shows the mode of the water-impervious member periphery of the underground irrigation system of FIG. It is a schematic sectional drawing which shows operation | movement of the water level management device of FIG. 7, (A) shows the state which the water supply opening opened, (B) shows the state which the water supply opening closed. FIG. 8 is a schematic cross-sectional view showing a state in which the water level of gravity water is changed for each water shielding member in the underground irrigation system of FIG. 7. It is a schematic sectional drawing which shows a mode that the underground irrigation system of FIG. 7 was applied to land with many undulations. It is a schematic sectional drawing which illustrates a mode that a gutter-like member was provided in a water-impervious member used for an underground irrigation system of this invention. It is an illustration figure which shows the further another Example of the underground irrigation system of this invention. It is an illustration figure which shows the further another Example of the underground irrigation system of this invention. It is a schematic sectional drawing which shows an example of the mode of the impermeable member periphery of the underground irrigation system of FIG. It is a schematic sectional drawing which shows another example of the state of the impermeable member periphery of the underground irrigation system of FIG. It is a schematic sectional drawing which shows another example of the mode of the water-impervious member periphery of the underground irrigation system of FIG. It is a schematic sectional drawing which shows another example of the mode of the water-impervious member periphery of the underground irrigation system of FIG. It is an illustration figure which shows the further another Example of the underground irrigation system of this invention. It is a perspective view which shows an example of the water-impervious member used for the underground irrigation system of FIG. It is a schematic sectional drawing which shows an example of the mode of the water-impervious member periphery of the underground irrigation system of FIG. It is sectional drawing which shows an example of the connection member used for the underground irrigation system of FIG. It is a top view which shows the connection member of FIG. It is an illustration figure which shows a mode that the water-impervious member was connected by the connection member of FIG. It is a perspective view which shows another example of the water-impervious member used for the underground irrigation system of FIG. FIG. 20 is a schematic cross-sectional view showing another example of a state around a water shielding member of the underground irrigation system of FIG. 19. It is an illustration figure which shows another example of the connection member used for the underground irrigation system of FIG. It is sectional drawing which shows a mode that a water shielding member is connected by the connection member of FIG. It is an illustration figure which shows another example of the connection member used for the underground irrigation system of FIG. It is sectional drawing which shows a mode that a water-impervious member is connected by the connection member of FIG.

It is sectional drawing which shows another example of the connection member used for the underground irrigation system of FIG. It is a top view which shows the connection member of FIG. It is a top view which shows another example of the connection member used for the underground irrigation system of FIG. It is sectional drawing which shows another example of the connection member used for the underground irrigation system of FIG. It is sectional drawing which shows another example of the connection member used for the underground irrigation system of FIG. It is sectional drawing which shows another example of the connection member used for the underground irrigation system of FIG. FIG. 20 is a schematic cross-sectional view showing still another example of the state around the water shielding member of the underground irrigation system in FIG. 19. It is sectional drawing which shows an example of the connection member used for the water-impervious member of FIG. It is sectional drawing which shows an example of the connection member used for the water-impervious member of FIG. FIG. 20 is a schematic cross-sectional view showing still another example of the state around the water shielding member of the underground irrigation system in FIG. 19. FIG. 20 is a schematic cross-sectional view showing still another example of the state around the water shielding member of the underground irrigation system in FIG. 19. FIG. 20 is a schematic cross-sectional view showing still another example of the state around the water shielding member of the underground irrigation system in FIG. 19. It is an illustration figure which shows the further another Example of the underground irrigation system of this invention. It is a schematic sectional drawing which shows the underground irrigation system of FIG. It is a schematic sectional drawing which shows the further another Example of the underground irrigation system of this invention. It is a schematic sectional drawing which shows the further another Example of the underground irrigation system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Underground irrigation system 12 ... Water tank 14 ... Water supply pipe 16 ... Water shielding member 18 ... Water level controller 20 ... Main pipe 22 ... Branch pipe 26 ... Gravity water state soil part 28 ... Gravity water level 30 ... Capillary water state Soil part 92 ... water channel 110 ... connecting member 114 ... pipe member 116 ... socket 138 ... water guide part 200 ... cultivated land

Claims (7)

A water-impervious member formed in a container shape with an upper opening and having a gravitational water-state soil portion therein,
Water supply means for supplying water into the water-impervious member to form the soil part, and when the gravity water level of the soil part is equal to or higher than a set value, water supply by the water supply means is stopped, and the gravity of the soil part An underground irrigation system comprising water level management means for supplying water by the water supply means when the water level is less than a set value.   The underground irrigation system according to claim 1, wherein the water shielding member is formed in a horizontal tubular shape having an opening on an upper surface thereof.   The underground irrigation system according to claim 2, wherein the water shielding member includes a reinforcing portion for reinforcing the opening.   The underground irrigation system according to any one of claims 1 to 3, wherein the water supply means includes a water supply member for forming a water channel that passes through the water shielding member.   The underground irrigation system according to claim 4, wherein the water supply member includes a pipe member provided inside the water shielding member. A connection member provided at at least one end of the water-impervious member;
The underground irrigation system according to claim 5, wherein the connection member connects the water-impervious member and the other water-impervious member and connects the pipe member and the other pipe member. A double pipe unit that is used in the underground irrigation system according to any one of claims 1 to 6 and that is connected to the ground of a cultivated land,
A water-impervious member formed in a horizontal tube having an opening on the upper surface;
A pipe member provided inside the water-impervious member; and provided at at least one end of the water-impervious member to connect the water-impervious member and the other water-impervious member; and the pipe member and the other pipe A double pipe unit comprising a connecting member for connecting the member.

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