JP2007110938A - Plant-growing water-absorbing/draining body and method for installing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature-sensitive plant-growing water-absorbing/draining body made of water absorbing/draining resin having water absorption with high expansion rate 100-150 times as high as normal one, and having such a characteristic as to sense a temperature when the temperature of the resin reaches a specific value (temperature sensing point) during temperature rise and drain absorbed and retained water at a blow, and enabling utilization of almost part of the inside of the pipe as an air supply pipe: and to provide a method for constructing the body. <P>SOLUTION: The temperature-sensitive plant-growing water-absorbing/draining body comprises a longitudinal pipe body P having a lot of water absorption/drainage holes 2 with shape-keeping property and flexibility to external pressure and a hollow part 3 inside. The hollow part 3 is interiorly provided with temperature-sensitive water-absorbing/draining resin 4 which absorbs water at low temperature to expand its cubical content and drains the absorbed water at a blast when the peripheral temperature reaches a preset value. The plant-growing water-absorbing/draining body P is laid under the soil of a plant growth ground in such a state as to open at least part of the body on the ground. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a long cylinder having pressure-resistant deformation performance and flexibility to be embedded and used in soil such as a field for seeding and growing crops, or the roots of trees such as orchards and tree-lined roads, The present invention relates to a drainage body for plant growth water that self-senses the temperature of the surrounding soil when the soil is dried at high temperature and discharges retained water into the soil.

  More specifically, the excess water that permeates into the soil during raining or watering is self-sensed and absorbs and expands, and when the dryness in the soil increases, the preset dryness level is self-sensed by increasing the underground temperature, The present invention relates to a water-absorbing drainage body that discharges water retained after being absorbed and swollen into the soil.

  A flexible pipe-like object intended by the present invention is embedded in the soil in advance, and excess water that has penetrated into the soil during raining or watering is detected and absorbed and retained. The technical idea of discharging the water that has been absorbed and absorbed into the soil when the dryness in the soil is increased, and a specific water-absorbing drainage body as described above are described in Patent Document 1 described later. Already known. The underground water retention pipe has a water-permeable expansive resin such as a water-absorbing synthetic resin polymer enclosed in another water-permeable pipe or water-permeable bag having a smaller diameter than the pipe inside the water-permeable pipe body. It is a water retaining pipe that has a double structure inside and outside.

  In addition, as another technique, a sheet-like vegetation unit formed in a multilayer shape by providing an open-cell porous body or a fiber compression-molded body containing a temperature-sensitive water-absorbing and draining resin on a root-proof sheet provided on a base. It is described in Patent Document 2 described later and is already publicly known.

On the other hand, it is buried in soft ground and used for soil improvement that collects surplus water in the ground such as spring water, guides it in the required direction, and drains it. A culvert tube provided with a hole is already known as can be seen in Patent Document 3 below.
Japanese Patent No. 3322276 JP 2004-254560 A JP 2002-155525 A

  Among these known documents, in the water retaining pipe having the inner and outer double structure described in Patent Document 1, when the water-absorbing expansive resin enclosed in the interior absorbs and expands and retains the water, the drainage is required. Because it is a resin that can only release water gradually, even when it is necessary to supply moisture to the roots of the plant in the hot summer season, water is not sufficiently supplied from the water-swellable resin, However, it has a problem that it cannot weaken enough to promote sufficient growth. In other words, the water-swellable resin described in Patent Document 1 releases water only gradually even when it is necessary to supply moisture to the roots of plants during the hot summer season. In spite of this, it is impossible to eliminate the problem that soil drying causes a situation where plants weaken and hinder growth.

  In addition, the water-absorbing expandable resin described in Patent Document 1 is a resin having a property of releasing water only gradually as described above. Therefore, the water-retained and expanded state continues for a long time, and the air flow in the pipe continues. Another problem was that it was difficult to create a gap and it was difficult to use as an air-permeable tube that sent air to the roots of plants.

On the other hand, in the sheet-like vegetation unit described in Patent Document 2, since the object is a sheet-like object, it seems that it is suitable for vegetation of flowers with small height, but there is a great need for promoting growth. It is not suitable for sufficient hydration necessary to promote the growth of field plants and trees,
It has the subject that the air supply to the root of a plant cannot be performed.

  Therefore, in order to solve the problems of the known technology, the present invention is a substance having an extremely high water absorption coefficient that absorbs and expands water at a low temperature as a temperature-sensitive water-absorbing resin. , For example, a water-absorbing resin with a high expansion coefficient of 100 to 1050 times, and water that has been absorbed and retained by self-sensing when the temperature rises to a specific temperature (temperature sensing point). It is intended to provide a plant-growing water-absorbing drainage body that can be used as an air supply pipe after drainage, and a method for laying it. Is.

  The structure of the plant growth water absorption and drainage body according to the present invention taken to achieve the object will be described using the reference numerals used in the drawings of the examples. A long tubular body P having a suction / drainage hole 2 and having a hollow portion 3 therein, the hollow portion 3 absorbs water at a low temperature and undergoes volume expansion, and the ambient temperature is a preset temperature. The temperature-sensitive water-absorbing resin 4 having the property of discharging the absorbed water at a time when the temperature reaches the point is configured to be installed in a predetermined amount along the length direction of the pipe body P.

  Moreover, the structure about the laying method of the plant growth water absorption / drainage body which has such a structure has the shape retention property with respect to an external pressure, flexibility, many absorption / drainage holes 2, and has the cavity part 3 inside. The long tubular body P has the property of absorbing water at a low temperature and expanding in volume in the cavity 3 and discharging the absorbed water at a time when the ambient temperature reaches a preset temperature. The plant-grown water-absorbing and draining body P in which a predetermined amount of the temperature-sensitive water-absorbing resin 4 is internally provided along the length direction of the pipe body P is at least one end or a part thereof opened to the ground. It is intended to be buried in the breeding area.

  The plant-growing water absorption / drainage body referred to in the present invention adopts a high expansion coefficient water absorption / drainage resin, and at the same time, a water absorption / drainage resin having the property of draining retained water at a time when draining, Because it is used by installing a predetermined amount along the length direction of the pipe body, the water-absorbing resin absorbs and expands excess water that has penetrated into the soil during rainfall or watering, and the degree of dryness in the soil is determined beforehand. By raising the set underground temperature, water that has been absorbed and absorbed is discharged all at once into the soil, promoting the growth of plants, and after draining, it changes to a small volume all at once. By changing to an air layer, it can be used as an air supply pipe for the air supply body to the root of the plant, and the double effect that the growth of the plant by air supply can be promoted can be expected. It was.

  In addition, when the water absorption / drainage resin performance deteriorates due to repeated frequency of water absorption / drainage, or when plants are harvested or transplanted, or replaced with heterogeneous plants, replacement with a new water intake / drainage body or removal, Since it is only necessary to remove the water-absorbing and drainage body with the water-soluble resin inside the tube, the water-absorbing and draining resin can be reliably and easily recovered and replaced without remaining in the soil. It has the remarkable advantage of.

  On the other hand, the laying method of the plant growth water absorption drainage body referred to in the present invention is to bury the plant growth water absorption drainage body as described above at least at one end, at both ends, or in the middle. Since a part of it is open on the ground, it is embedded in the plant growing area, so it is easy to discharge the air inside the pipe when the water-absorbing resin expands and absorbs water easily. Even when the water that has been absorbed and expanded by the water-absorbing and draining resin is discharged into the soil at once, external air can be easily introduced into the pipe through the opening opened on the ground. It is possible to easily reduce the volume of the water-absorbing and drainage resin at the time of draining the retained water, and after draining the retained water, a large volume cavity can be formed in the pipe, It can be used as an air supply path It is that can be reliably effective.

  In carrying out the plant growth water absorption / drainage body of the present invention, the temperature-absorbing / drainage resin 4 having a high water absorption ratio of, for example, 100 times to 1050 times is used. Moreover, this temperature-sensitive water-absorbing resin 4 is selected from those having different temperature-sensitive points, and only one of them is used to concentrate the drainage of the holding water at one time, or a plurality of types having different temperature-sensitive points. It is also possible to mix the above resin and drain the retained water into a plurality of times. The temperature-sensitive water-absorbing and draining resin 4 is, for example, in the range of 1 to 20% or less, preferably in the range of 1 to 10% or less of the internal volume of the cavity 3 in the tube P, and the length of the tube. It is preferable to use it as being installed along the vertical direction. When the amount of the interior of the pipe is 1% or less, it is difficult to obtain a practical amount of drainage even when the temperature-sensitive water-absorbing resin 4 having a high expansion rate as described above is used. When the interior is built, volume expansion at the time of water absorption is hindered by the tube wall, and it becomes difficult to obtain a sufficient expansion effect. Therefore, it is preferably within the above range.

  Moreover, as the temperature-sensitive water-absorbing resin 4 referred to in the present invention, specifically, Thermogel (registered trademark) manufactured by Kojin Co., Ltd. can be exemplified. The thermogel here absorbs and holds water at a low temperature, and when the ambient temperature rises and exceeds a preset temperature, it has a temperature-sensitive characteristic of discharging the water that has been absorbed and held to the outside at once. A water-absorbing resin.

  The thermosensitive point of this thermogel can be appropriately set between 15 ° C. and 60 ° C. according to the application, and standard grades include 20 ° C., 25 ° C., 30 ° C., 35 ° C., 40 ° C., etc. . Needless to say, this temperature is not limited to these temperatures, and can be set as appropriate. The thermosensitive water absorption / drainage characteristics of this thermogel have the property that even if the water absorption / drainage is repeated 10,000 times or more, the water absorption / drainage characteristics do not change.

  Embodiments of the present invention will be described below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of the present invention, FIG. 1 is a front cross-sectional front view showing a tubular body used for installing a temperature-sensitive water-absorbing and draining resin, and FIG. FIG. 3 is a perspective view showing the upper half section of another tubular body used for carrying out the present invention, FIG. 4 is a perspective view showing the porous wall constituting the tubular body, and FIG. Fig. 6 is a partially cutaway view showing a small-diameter cylindrical body in which a temperature-sensitive water-absorbing resin is internally provided; The schematic diagram which shows the relationship between a body, the state after water discharge, and a tubular body, FIG. 7 is a perspective view which shows a use condition.

  Thus, the pipe body P shown in FIG. 1 is a view showing an example of a pipe body used for embedding the granular substance of the temperature-sensitive water-absorbing and draining resin 4 in carrying out the present invention, The inner shape is shown across the upper half, and the outer shape is shown in the lower half.

  The tubular body P shown in the first embodiment has a plurality of water supply / drainage holes 2 having a structure which will be described later by spirally winding a polyethylene reinforcing core 11 formed to a predetermined width with a predetermined interval. The provided porous membrane 12 is spirally wound between the adjacent reinforcing cores 11 and 11, and both side edges thereof are adjacent to each other while being bonded to the reinforcing cores 11 and 11 using an adhesive or heat-sealing. Another reinforcing member 13 made of polyethylene which is wound so as to block between the reinforcing cores 11 and formed to have a predetermined width is spirally wound on both side edges of the porous membrane 12 to form the reinforcing core. It is formed by adhering on the outer peripheral surface of the material using an adhesive or heat-sealing.

  Thus, the reinforcing core 11 has a cross-sectional shape in which the lower side is arcuate and the upper side is formed flat, and the outer peripheral protective member 13 has its lateral width as a reinforcing core as seen in FIG. It is formed so as to have substantially the same width as the lateral width of the material 11, and an intermediate portion thereof is formed so as to be directly bonded and integrated with the outer peripheral surface of the reinforcing core material 11. By doing in this way, even when a large earth pressure is concentrated on the outer periphery protection member 13, it is possible to work together with the reinforcing core member 11 to prevent deformation. .

  As shown in FIG. 2, the porous membrane 12 shown in this example is formed by extruding a low melting point resin film made of a low melting point polyethylene resin on both the front and back surfaces of a high melting point resin made of a high density polyethylene resin by a coextrusion means. The tape-like material f obtained by biaxially stretching the film-like material to a thickness of about 130 μm and cutting it to a width of about 1 mm is used as the yarn material for the fabric. Both the warp and the weft are about 1 mm. Distribute the yarns at intervals and make a plain fabric in which a large number of approximately square square water intake and drain holes 2 of about 1 mm square are regularly arranged. The plain fabric is further heated under pressure and present on the surface of the tape-like material f, f. The melted low melting point resins are fused to each other, and the film is provided with a large number of small holes that do not expand or contract in the weft direction and hardly expand or contract.

  Needless to say, the diameter of the tube P and the pitch of the reinforcing core 11 should be appropriately changed as necessary. The tube P shown in this embodiment has an inner diameter of 100 mm. The approximate dimensions of each part of the pipe are as follows. The minimum diameter formed by the reinforcing core 11 is 94 mm, the diameter of the porous membrane 12 is 100 mm, the spiral pitch is 35 mm, the lateral width of the reinforcing core 11 is 16 mm, and the lateral width of the outer peripheral protective material 13 is 16 mm.

  FIG. 3 shows another embodiment of the tubular body P referred to in the present invention. The tubular body P shown in FIG. 3 has a shape of the reinforcing core material 11 corresponding to the reinforcing core material in the tubular body P shown in FIG. The shape of the outer periphery protective member 13 is a portion that has a flat portion with a central portion protruding in a trapezoidal shape toward the outer peripheral surface side and a lower end portion protruding toward the lateral outer side, and is bonded to the porous film 12 It is what.

  In addition, the tubular body P shown in the embodiment has the porous film 12 made of the stretched film material described in the tubular body P shown in FIG. 1 as an inner surface as the structure of the porous film 12 having a large number of small holes. The second water-permeable membrane 12b made of nonwoven fabric shown in FIG. 4 is arranged in a double-stacked manner on the outer peripheral surface side of the first water-permeable membrane 12a, and is sandwiched between the reinforcing core material 11 and the outer peripheral protective material 13 It is made into the structure made to do.

  The second water permeable membrane 12b is formed of a 7 denier extruded by a coextrusion means as a core-sheath shape having a central portion made of a high melting point resin made of a polyester resin and its periphery wrapped with a low melting point resin made of a low melting point polyethylene resin material. A non-woven fabric constituent fiber formed by appropriately cutting a fibrous material and cutting it to an appropriate length, and having a density of about 0.15 g / cm 3 and a thickness of about 0.1 mm.

  The tube P formed in this way has shape retention and flexibility against external pressure, and has a large number of water intake / drain holes 2 on the tube wall and a tube P having a hollow portion 3 inside. is there. The cavity 3 absorbs water at a low temperature and expands in volume by a factor of 100 to 150, and has a characteristic of discharging the absorbed water all at once when the ambient temperature reaches a preset temperature. The granular material of the hot water-absorbing and draining resin 4 is used inside.

  FIG. 5 shows a means for embedding the temperature-sensitive water-absorbing and draining resin 4 having such properties. A tape-shaped material obtained by cutting a non-permeable non-woven fabric having water permeability into a required width. The cylindrical body 5 is formed along the longitudinal direction by the heating and melting means 51 or by the sewing means using the sewing thread. The fused portion and the sewn portion are set to have a strength that can be easily cut without resisting the expansion force when the temperature-sensitive water-absorbing and draining resin 4 packed therein absorbs water and expands in volume.

  As one of the means, it is possible to sew with a thread that self-decomposes and loses its tension once it absorbs water, for example, a paper thread thread, a paper thread, a starch thread, or the like. In addition, the cylindrical body 5 may be formed of a material having a property of softening and losing its shape as a non-woven fabric when it absorbs water, for example, formed of starch fibers, or of an oblate made of starch and agar. it can. Further, the fibers forming the nonwoven fabric itself are formed of such starch-made fibers, and are further formed of fibers formed of the temperature-sensitive water-absorbing resin 4, or such fibers and chemicals. It is also possible to form the cylindrical body 5 using a nonwoven fabric formed of mixed fibers with fibers, or to form a thick nonwoven fabric in which such fibers are laminated in a mat shape and use it as a temperature-sensitive water-absorbing and draining resin. Is possible.

  The small-diameter cylindrical body 5 is filled with the granular material of the temperature-sensitive water-absorbing and draining resin 4 almost completely, and the packed granular material 4 is restrained from freely moving in the cylindrical body 5. This means that the packed granular material 4 is packed in a substantially equal amount throughout the entire length of the cylindrical body 5 without greatly increasing or decreasing partly.

  The cross-sectional area of the cylindrical body 5 is about 1 to 20% larger than the inner volume of the tube P shown in FIG. Is good.

  In this way, the cylindrical body 5 filled with the granular material of the temperature-sensitive water-absorbing and draining resin 4 in a full interior is left at an appropriate length at least at one end or both ends of the tubular body P shown in FIG. It is used by inserting it over almost the entire length.

  As shown in FIG. 7, for example, as shown in FIG. 7, the tubular body P in which the cylindrical body 5 packed with the granular substance of the temperature-sensitive water-absorbing and draining resin 4 is provided over almost the entire length of the tubular body P. It embeds in the ground along the length direction of the breeding ridge R, and extends one end or both ends to the outside of the ridge R so as to be opened. Depending on the case, you may protrude the middle part of the pipe P to the ground. In this way, a part of the pipe P is in contact with the ground so that the air can freely move, and the air in the pipe P can be freely discharged during the water absorption and expansion of the temperature-sensitive water-absorbing resin. In addition, care should be taken so that air can be freely sucked into the pipe body P when draining the expanded and held water.

  Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures of these embodiments, and includes the above-described constituent features according to the present invention. The present invention can be carried out with appropriate modifications within the scope of achieving the object and having the above-mentioned effects.

  In the present invention, excess water that has penetrated into the soil during rainfall or watering is self-sensing by the water-absorbing resin, and absorbs and expands. The water that has been naturally detected and absorbed and swollen is discharged into the soil at once, thereby promoting the growth of the plant. It can be changed to an air layer and used as an air supply tube to the roots of plants as an air supply pipe. It can promote the growth of plants by supplying air to the roots of the plant. In the future, it is expected to be widely spread.

The upper half cross-sectional front view which shows a use pipe body. The perspective view which shows a porous wall. The upper half cross-sectional front view which shows another use pipe body. The perspective view which shows another porous wall. The partially broken figure which shows the interior small diameter cylindrical thing of temperature-sensitive water absorption / drainage resin. The schematic diagram which shows the water absorption / drainage state of temperature-sensitive water absorption / drainage resin. The perspective view which shows a use condition.

Explanation of symbols

P tube 2 Water supply / drain hole 3 Cavity 4 Temperature sensitive water drainage resin 5 Cylindrical body

Claims (2)

A long tubular body P having a shape retaining property and flexibility with respect to external pressure and a large number of water intake / drain holes 2 and having a cavity 3 therein, and absorbs water into the cavity 3 at a low temperature. The temperature-sensitive water-absorbing resin 4 having the property of discharging the water absorbed and retained at a time when the ambient temperature reaches a preset temperature is discharged along the length direction of the tube P. Fixed amount of plant growth water absorption drainage body. A long tubular body P having a shape retaining property and flexibility with respect to external pressure and a large number of water intake / drain holes 2 and having a cavity 3 therein, and absorbs water into the cavity 3 at a low temperature. A predetermined amount of the temperature-sensitive water-absorbing resin 4 having the property of discharging the water absorbed at a time when the ambient temperature reaches a preset temperature is discharged along the length direction of the tube P. A method for laying a plant-growing water-absorbing and draining body, characterized in that the plant-growing water-absorbing and draining body P is embedded in the ground of the plant-growing area with at least one end or a part thereof opened on the ground .

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