JP2003284429A - Method for producing construction material, and method for constructing the material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water retainable construction material for civil engineering, making it possible to rapidly discharge water when a soil part for growing plants, or a soil dressing part with no plants such as a playground or the like contains superflous water due to heavy rain or the like, and to the contrary, making it possible to supply water from a water retainable part to the soil part for growing plants or the soil dressing part when they contains insufficient water, and to provide a method for constructing the material. <P>SOLUTION: The water retainable construction material is obtained through the following process: molding a mixture of a hydrophobic raw material with a binder to form a hydrophobic part, interiorly fixing a water retainable material when molding the hydrophobic raw material so as to expose the surface of one side of the water retainable material to form a water-retainable part to make the exposed surface come in contact with the soil part or the soil dressing part after constructed. This structure utilizes the capillary phenomenon based on the fundamental principal of capillary potential which is caused by change of water content in natural soil or soil dressing so that water content of the soil part or the soil dressing part is adjustable so as not to get excessive or insufficient. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidified product having both a culvert effect due to hydrophobicity and a water retention property, which prevents the soil from shifting to a supersaturated water content due to heavy rain and the like, and prevents the soil from becoming saturated when it is dried. The present invention relates to manufacturing of members having both hydrophobic and water-retaining functions applicable to agricultural civil engineering, environmental civil engineering, general civil engineering, and construction that can permanently supply water, and a construction method using the same.

[0002]

2. Description of the Related Art The prior art is as follows. (1) In growing and cultivating a plant, it is extremely important that the soil that is the base of the plant always has an optimum water content.
At the same time, it is well known that it is extremely difficult. The damage caused by supersaturated hydration of soil due to heavy rain in the rainy season has been a problem in various plant cultivation such as root rot disease, disease occurrence, and fertilizer loss. It is well known that measures such as construction of a culvert, a culvert, etc., or prevention of disease outbreak by spraying chemicals have been taken as a countermeasure. However, these measures are merely for the purpose of preventing the increase of the water content in the soil, and are not the measures for drying, and it is extremely difficult to maintain an appropriate water content. (2) Laying of drains and underdrains is to simply discharge water out of the system, which causes soil to become dry soil in the case of continuous sunshine, which leads to reduced plant growth or dust. It was. As measures against dryness, methods such as spraying water with a sprinkler and improving water retention of soil quality by mixing water retention material with soil have been taken. However, these methods are incompatible with hydrophobicity and water retention, and it is not possible to cope with both heavy rain and dryness. (3) Among the conventional soil water retention improvement measures, when water retention materials are directly mixed into the soil, the water content of the soil may increase to cause oversaturation during rainwater, causing root rot compared to the case where no water retention material is added. Often, it was a problem and this method was not appropriate. (4) It is important that the optimum conditions for growing and cultivating plants are neither high water content nor low water content, and there is no method for preparing such an environment up to now, and both functions are maintained at the same time. There was no material. Although there is a large difference depending on the type of plant, in the cultivation of strawberries, lettuce, flowers, melons, lawns, etc., it is particularly important to take countermeasures against it, and a method that enables it has been desired. (5) Rooftop greening has been seriously studied in recent years for the purpose of improving the urban landscape, reducing carbon dioxide gas, and reducing the temperature rise due to concrete in urban areas. Generally, the rooftop is often in a severe environment for plant growth, especially when the temperature rises sharply.
In addition, since the wind is often strong and the soil dries quickly, it often becomes a problem in planting plants. In such a harsh environment, plants often have water shortages, so it is not easy to manage water for plant growth as a countermeasure, and because it is on the roof, it is often impossible to spray water, which is a problem. Was becoming. Therefore, it is easy to supply water,
Moreover, it has been desired to provide a greening material or a construction method that can be expected to continuously lower the rooftop temperature due to the heat of vaporization of water. (6) Sprinklers and water sprinkles on the slopes of roads in the central green zone, lateral green zone, and slope greenery hinder the transportation of water during drying, and watering is often impossible, making plant growth extremely difficult. there were. Therefore, most of the time, there is no choice but to wait for natural rainfall, and in the case of continuous sunshine, the plants stop growing and sometimes die due to lack of water. In the method of sowing from seeds, the shortage of water for germination of seeds is the biggest problem, and surface drainage occurs due to insufficient drainage capacity of rainwater during heavy rain, resulting in frequent seed runoff accidents. Until now, there is a limit to the plants to be planted in greening in such places, and there is only a method of transplanting after growing some plants that are resistant to drought, shrubs, and flowers to some extent, and only specific plants are planted. There was a strong tendency.
This is aesthetically limited, and it has been desired that various kinds of plants can be planted by some suitable means. (7) In terms of slopes, most of the construction is on sloping land, and there is a problem of preventing landslides after construction due to the occurrence of large amounts of rainwater.
A large amount of water, which is the cause of this, is frequently lost to the surface of the soil, and the accidents that damage the protected plants associated with it are occurring frequently. It has been well known that promptly discharging water to the outside to reduce the amount of water flowing over the surface is a method of preventing the loss of the soil and the damage to the protected plants. For this reason, measures such as underdrain laying are taken, but at the same time, there was often a dry condition due to insufficient water due to excessive drainage. It is extremely effective if it can retain both functions of water retention and drainage, and such materials and construction methods have been demanded. (8) In the ground such as ground that is not covered by turf, the lack of water due to the drying of the soil causes dust due to the wind, resulting in interruption of exercise and eye diseases. There was a problem. Further, since the hardness of the soil is increased due to lack of water in the soil, there are many injuries in sports on the soil, and a method capable of always maintaining a constant and appropriate water content has been desired. In the summer, water has been sprayed with a hose as a countermeasure to these problems, but these measures have the problems of wasting water, prohibiting the use of grounds during water sprinkling, etc. There was a need for a good way to solve. (9) In parks, golf courses, amusement parks, etc., we often see sprinkler equipment as a water countermeasure, but at the same time, we can see signs forbidden for people to enter during operation. Sprinkler equipment is inconvenient in such places where people are constantly coming and going. In particular, after sprinkling water, the grass or the like is wet and cannot be used until it is dried, which is a problem. There has been a demand for a construction method that does not operate the sprinkler, the surface turf does not get wet, and the lawn growth is not affected even if some sunshine continues. Furthermore, in the case of heavy rain, a measure to drain water quickly was required.

[0003]

The problem to be solved by the present invention is to promptly solve the problem that the water content of the soil part for growing plants or the part of the soil such as ground without plants is excessive due to heavy rain. It is an issue to drain water to the soil and to replenish the water without using artificial methods such as water sprinkling when the water in the soil or the soil becomes dry and becomes dry soil. And a material having both functional parts of a hydrophobic part and a water-retaining part, which makes it possible to keep the fluctuation of water content in the soil part or the guest soil part small. The problem is to solve the problem by providing the construction method using.

[0004]

Means for Solving the Problem
In 0-403053, Japanese Patent Application No. 2000-404580, and Japanese Patent Application No. 2001-402333, a molding material (hereinafter referred to as hydrophobic material) capable of imparting hydrophobicity or water permeability (hereinafter referred to as hydrophobicity) is prepared by using an inorganic binder such as cement. A hydrophobic solidified product is obtained by solidifying,
Furthermore, by providing a built-in underdrain, it was possible to make a composite underdrain. However, these inventions relating to the solidified hydrophobic material and the construction work emphasized the hydrophobicity and did not consider the water retention.
The present inventor focused on only the hydrophobic property of the series of techniques, and in consideration of the fact that it is difficult to be applied to applications requiring water retention since it is extremely ineffective in retaining water, and further, in a natural environment, it is hydrophobic. Since water and water retention functions are often required, it has water retention as a measure when soil and guest soil (hereinafter referred to as soil part) become dry and inappropriate for plant growth. Tests have confirmed that it is effective to integrate the substances. The above invention is a method in which a hydrophobic material and an inorganic binder such as cement are kneaded with a mixer or the like, and the mixture is filled in a molding die to form a molded product into a hydrophobic part. It was impossible to retain water, and as it was, it was impossible to achieve the object of the present invention. In particular, when the water retaining material is kneaded at the same time when the hydrophobic material and the inorganic binder such as cement are kneaded, the surface of the water retaining material is sealed by the binder, which causes a decrease in the water retaining effect due to a decrease in water absorption. Was confirmed.
From such a fact, it was generally considered difficult to impart water retention while making the most of the hydrophobic function, but the present inventor integrated the water retention part that can closely contact with the upper soil part inside the hydrophobic part. By molding and replenishing water from the water retention part to the soil part by utilizing the principle of the capillary phenomenon due to the decrease in water potential against water desaturation in the soil part, it is possible to reduce changes in the water content of the soil. It was found that it is possible, and excess water can be removed by the hydrophobic part with respect to water caused by heavy rain and the like, and it has been found that it is possible to provide a material having both properties. That is, the water-retaining part is disposed inside the hydrophobic part of the molded product, does not exist in the soil, the upper part thereof is not sealed by the binder, and the water content of the soil part is reduced by direct contact with the soil part. It was confirmed that the water content of the water retaining part can be easily transferred to the soil side by the capillary phenomenon when the water content of the plant is lowered by water absorption or natural drying. The present invention does not need to take a means of imparting water retention by mixing a water retention material into the soil itself as in the conventional case by integrating the hydrophobic part and the water retention part, which exert an underdrain effect, by molding, so that a large amount of Since it is possible to retain water in the water retaining portion outside the soil portion, it is possible to avoid the occurrence of root rot caused by mixing the water retaining material with the soil itself. In particular, when the soil water saturation is high, the difference in the capillary potential between the soil and the water retention part is small, so the capillary stress becomes small and the capillary phenomenon does not easily occur, and the transfer of water to the soil is unlikely to occur. . As a result,
Excessive water supply does not occur because it is difficult for water to transfer from the water retaining part to the soil part. In addition, the construction of the water retention section is also extremely economical because it can store rainwater underground and is effective in reducing the amount of water used. Furthermore, when the material according to the present invention is used, when the water content in the soil part is excessive, the underdrain effect that can be discharged to the outside via the hydrophobic part is also an effect when the hydrophobic part and the water retention part are constructed separately. As described above, the means for solving the problem of the present invention is characterized in that a hydrophobic portion capable of removing excess water and a water retaining portion that retains water are individually constructed in the solidified structure, which is required due to the difference in capillary potential. Therefore, it was decided to form a system of water supply from the lower water retaining part to the upper soil part by the natural force according to the above.

Next, it is often necessary to enhance the compressive strength of the hydrophobic, water-retaining molding of the present invention. In particular, the water retaining portion often has a reduced compressive strength only at this portion when absorbing water for retaining water. In such a case, the problem can be solved by integrally molding so as to cover the entire surface of the material of the present invention, or partially with a reinforcing material that does not prevent the transfer of water from the water retaining part to the soil part. I did it. further,
It is possible to increase the pressure resistance by selecting the reinforcing material.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiment of the present invention is a method for manufacturing a molded product, which is capable of integrally forming a hydrophobic portion having a hydrophobic function and a water retaining portion having a water retaining function by molding, and further maintaining pressure resistance, And its construction method. Outdoors,
There are many damages caused by excess water or sunshine and lack of water both indoors and out. In the present invention, the above-mentioned damage is prevented at the same time by producing and constructing a molded product that retains both the properties of hydrophobicity and water retention, and is also a method of preventing runoff of the fertilizer component. It is extremely difficult to give these two properties to the soil part. For example, the means for mixing the water retention material (eg, vermculite, phenol resin foam, peat moss) into the soil part is There was a high risk of excess, which often caused root rot. Further, simply providing a hydrophobic function with a water permeability improving material (eg, gravel, Kanuma soil) for the purpose of imparting hydrophobicity often causes water shortage, which causes plant death. The present invention eliminates the drawback, forms a water retaining portion inside the hydrophobic portion, and replenishes the water retained by this water retaining portion to the soil portion based on the principle of the capillary phenomenon caused by the difference in the capillary potential. The main purpose is to take a form. Further, it was found that the integrally molded product is appropriate for the purpose of preventing the water retaining part from being floated up by heavy rain due to the integral molding and mixing with the upper soil part or the guest soil part.

The hydrophobic part (2) of the civil engineering material of the present invention is obtained by filling and solidifying a hydrophobic material in a mold with inorganic cement. The hydrophobic part is formed by the solidifying step, and the water retention material is set at the time of filling and solidification. Then, the water retaining part is constructed at a certain place from the inside to the outside of the hydrophobic part by integrating them. In the present invention, as the hydrophobic material forming the hydrophobic portion, it is necessary to select a material that can exhibit its characteristics. Examples of the hydrophobic material include rice husks, wood chips or coconut shells with low sugar content, gravel, synthetic resin foams, and the like. Examples of the synthetic resin foam include styrene foam, olefin resin foam, melamine resin foam, and the like, but most preferably,
Judging from the viewpoint of recycling, price, and ease of handling, it is a crushed product of used Styrofoam, and it is possible to use more than 5 times expanded Styrofoam. Further, as the binder capable of solidifying the hydrophobic material, organic solvents, inorganic binders, organic binders can be exemplified, but from the viewpoint of price, ordinary Portland cement, quick-setting cement, etc. are preferable and easily available. It is also optimal because it is easy to handle. The water-retaining substance (hereinafter referred to as the water-retaining material) forming the water-retaining part (3) can be used as long as it has a water-retaining effect, but it is preferable to use water in an amount of 5 times or more the absolute dry weight of the water-retaining substance. It is preferable that it can retain water. Further, in consideration of repeating water retention and water discharge, it is preferable that it can be used for a long period of time and can retain the water retention effect. Examples of the water-retaining substance that can be used include urethane resin foam, phenol resin foam, synthetic resin water-retaining material such as organic fiber bundles, or cellulose fiber bundles, cellulose fiber solidified matter, pulp and bundles thereof, and palm. Shell,
A plant water-retaining material such as cork can be effectively used.
Of these, those solidified with a binder are the easiest to handle.

Next, a molded article according to the present invention (water-holding material for civil engineering work) having the water-holding property and the hydrophobic property using the above materials
(1) Manufacturing will be described. The present description is an explanation of an embodiment in which a crushed polystyrene foam is used as the hydrophobic material. The styrofoam crushed product may be a polystyrene foam, but a foaming ratio of 10 times or more is preferred in the present invention. The reason is that Styrofoam is originally a substance that is difficult to bond with a cement-based binder, and the surface is formed by crushing to break the closed cells partially on the surface to make it rough, and a method that enables mechanical bonding with a binder. This is because it adopts. This principle is described in the above-mentioned pending patents. That is, the non-foamed product or the less than 10-fold foamed product has no bubble part to be broken during crushing, or has few bubble parts, which may cause trouble in mechanical adhesion. The crushing can be performed by a crusher, and the crushing method by impact or tearing force is most suitable for the production of the styrofoam crushed product used in the present invention. The particle size of these crushed styrene foams is preferably about 5 to 20 mm, and it is also possible to mix and use the crushed products of a plurality of particle sizes. If high pressure resistance is required, 40
It is preferable to use crushed styrofoam of less than double, and when pressure resistance is not required, crushed styrofoam of 40 times or more may be used, and the pressure resistance required by mixing these It is also possible to manufacture Since the styrofoam is closed cells, water does not enter inside the bubbles, and therefore the hydrophobicity is maintained. The use of the crushed waste Styrofoam as a hydrophobic material is an example, and various hydrophobic materials can be used by a similar method. Furthermore, it is also possible to mix and use a plurality of hydrophobic materials.

Next, a method of integrally molding the hydrophobic portion and the water retaining portion will be described. Hydrophobic material (4) Fill the cement mixture into a mold of the desired shape, and at that time, make hydrophobic so that the upper surface of the water retaining part (contact surface with soil) (5), which is one side of the water retaining material, is exposed. It is important to fill the wood and cement mixture mixture. By exposing one surface of the water retaining material, after the soil portion (9) is loaded on the upper portion thereof, the water retaining portion (3) and the soil portion (9) have the contact surface (5), A large amount of water contained in the water retention material migrates to the soil part (9) via the contact surface (5) between the water retention material and the soil part (9) due to the capillary phenomenon resulting from the increase in the capillary potential difference due to the decrease in water content. Will be replenished. In addition, if excessive water is generated due to heavy rain, etc., it can be discharged to the outside via the hydrophobic part when the water retention capacity of the water retention material exceeds, and it is easier to form a drainage channel. It is possible to discharge excess water to the outside. By doing so, it is possible to take measures against heavy rain, and it is possible to improve water retention and fertilizer retention.

Further, the water retaining material generally has a reduced pressure resistance when absorbing water. Therefore, in civil engineering work, the water retaining material is compressed by the weight of the contact surface between the soil portion and the lower water retaining material, and there is a risk that the internal water will be discharged to the outside via the hydrophobic portion, reducing the water retaining effect. Sometimes. As a countermeasure, it is necessary to reduce the weight on the water retention part,
For that purpose, it is effective to cover the fibrous material as shown in FIG. 2 during the integral molding. As the fibrous material or mesh material, vegetable fibers, synthetic resin fibers, inorganic fibers, etc. can be used and must be water-permeable. Examples thereof include the following, and non-woven fabrics, mesh products, fibrous products and the like, but non-woven fabric products and mesh products are particularly suitable for use. The plant fiber includes hemp fiber, coconut shell fiber and the like, and the synthetic resin fiber includes acrylic resin, nylon, polypropylene resin, polyethylene resin, aramid resin and the like spun or further processed. As the inorganic fiber, a wire of copper, iron or the like, a fibrous material or the like, a glass fiber or the like, and besides that, carbon fiber or the like can be used. The most suitable one is one obtained by processing these into a mesh shape, but it is also possible to use a fibrous or string-like material before mesh processing.

Next, the principle of movement of water by capillarity and the construction method using the water-retentive solidified product for civil engineering according to the present invention will be described with reference to FIGS. 3 and 4. These are diagrams of the case where the water-retentive solidified product for civil engineering work is buried, and are examples of embankment of soil and soil, showing the flow of water. FIG. 4 (a) is a diagram in which the water content of the soil part (9) is reduced by evaporation or plant absorption, and a large amount of water stored in the water retention part is transferred to the soil part (9). Figure 4
(B) is a state in the case of excessive rainfall, in which a part of the water is absorbed by the water retaining material, and the excess water is discharged into the soil or the underdrain pipe via the hydrophobic part. . That is, it is a diagram in which the water that cannot be absorbed and absorbed by the moisture retention is discharged to the outside. As described above, when the soil has no water storage capacity as in the conventional case, the amount of water discharged is extremely large and wasted.

[0012]

EXAMPLES The present invention will be described below with reference to Examples, but the invention is not limited to the following Examples without departing from the gist thereof. Example 1 As the hydrophobic material forming the hydrophobic part, used styrofoam such as used fish box, electric product cushioning material, etc. was crushed, and ordinary Portland cement and water were added and mixed in a mixer. The used expanded polystyrene used had a diameter of 5 to 15 mm by a crusher (manufactured by Taisetsu Co., Ltd.). By this crushing, the crushed surface of the used Styrofoam became an extremely rough and rough state, and it was observed by a microscope that the closed cells, which are the characteristics of Styrofoam, were partially broken. further,
Ordinary Portland cement (manufactured by Nittetsu Cement) was used as the binder. The water used was tap water. As the water retaining material, a mat-like molded product obtained by molding wood pulp by point bonding with an acrylic resin emulsion was used. The water-retaining material molded product has a dry weight of 0.5 kg, and the maximum water-retaining capacity during water retention is 6 liters of water. That is, it has a water retention capacity of about 12 times for 100 g of the mat-like material. Further, as the reinforcing mesh material for the purpose of imparting pressure resistance, jute (hemp fiber) was used in a string shape and further processed into a mesh shape. Next, the procedure for molding the water-retentive solidified product for civil engineering work will be described. Regarding the mixing procedure of the used styrofoam, water and ordinary Portland cement, 0.3 m ² of the used styrofoam was put into a concrete mixer, and then 10 l of water was put therein and mixed for 5 minutes. Immediately after the mixing, 30 kg of ordinary Portland cement was added and kneaded for 15 minutes. In this way, a mixture of ordinary Portland cement and water is attached to the surface of the used styrofoam crushed product. A water-retaining material prepared in advance by filling the hydrophobic part-forming material up to a depth of 10 cm in a rectangular iron mold having a width of 90 cm, a length of 100 cm, and a depth of 20 cm, and then flattening it to absorb water sufficiently. The material was placed. The meaning of allowing the water retention material to absorb water sufficiently is that when a dry material is used, the cement does not solidify because it absorbs the water of the kneaded material during the filling and solidifying process, and that it is used after commercialization. This is to cope with the inconvenience caused when the water retaining material expands due to the absorbed water. Then, the kneaded product is filled so that the upper part of the water retaining material is further exposed on the side portion thereof, and the reinforcing hemp mesh material is laid so as to be in close contact with the side portion, and then the mixture is directly placed in the mold.
It was left at room temperature for 4 hours and allowed to stand and solidify. After confirming that it was sufficiently cured in the mold, it was removed from the mold and left at room temperature for 1 week to obtain a product. A plurality of this product were manufactured and used for construction. The thus produced water-retentive solidified product for civil engineering work was obtained in a state where the water-retaining material was placed in the hydrophobic material, and the upper plane portion of the water-retaining material was not sealed with the hydrophobic material. By doing so, the water-retentive solidified material for civil engineering work can bring the water-retaining portion and the soil portion into close contact when forming the upper soil portion during use, and facilitate the movement of water by the capillary phenomenon. It is possible. That is, the water retained in the water retaining portion can be transferred to the soil portion via the contact surface due to the difference in the capillary potential between the water retaining material and the soil portion. Since the water retention material used in the present invention has resilience together with water retention, when water such as rain enters from above, the water retention material first absorbs and retains water, and further excess water invades. In some cases, it is designed to be discharged to the outside via the hydrophobic part. The water-retentive solidified product for civil engineering work is shown in FIGS. 1 and 2. Experimental Example 1 shows the relationship between the water movement between the water retaining material and the absolutely dry soil and the type of soil.
This is shown in FIG.

Experimental Example 1 The difference in the infiltration rate of rising capillaries due to the difference in soil quality when the water-retentive solidified product for main civil engineering was buried in the soil was actually measured. In the test method, a water-retaining material, which was made to retain water to the maximum extent, was placed at the bottom of a prism-shaped transparent acrylic container having a bottom of 10 cm × 10 cm. As the water retaining material, a mat-like molded product obtained by molding wood pulp by point bonding with an acrylic resin emulsion was used. Fine particle soil, medium particle soil, and sandy soil were separately filled in the upper part and lightly point-pressed to measure the rate of infiltration of capillaries by soil. All soils were used in an absolutely dry state, and the results are shown in FIG. As a result, it was confirmed that the infiltration rate of rising capillaries varied greatly depending on the soil quality depending on the soil quality.

Example 2 An example of construction using the water-retentive solidified product for civil engineering work produced in Example 1 according to the present invention will be described below. Example 1
In order to confirm the effect of the water-retaining solidified material for civil engineering works manufactured in, it was used for constructing the hydrophobic part of the soil part and the water-retaining part in the greening of the median road. FIG. 3 is a buried view at that time. In the present implementation, for comparison, a test zone in which the water-retentive solidified product for main civil engineering work was not buried was also installed. First of all, the burying depth of the water-retentive solidified product for civil engineering was set so that the thickness of the soil portion above it was 20 cm, and a growing test was conducted on May 15 by sowing seeds of grass. Floor soil
In order to unify the conditions, they were sufficiently mixed and stirred, and then divided into two and used for the test. The results of this germination growth test are shown in Table 1. still,
In this case, the sheet was protected so as not to be exposed to rainwater, and the test was conducted. Next, a test using a lawn beam was performed under the same soil condition as above. In this case, the thickness of the soil part was set to 10 cm, and the turf cultivated outside was laid. This test was carried out for 30 days from May 15th, when the conditions of natural weather are severe, and the degree of growth was visually judged. The results are shown in Table 2. As a result of this test, when the water-retentive solidified product for main civil engineering work is used as the groundwork for the soil part, the water retention capacity and the lawn growing capacity are completely different from the conventional methods, and it is possible to avoid drying the soil part. It was proved that it is easy to avoid the high water content due to rain and is extremely suitable for the growing environment. In the implementation, the conventional watering work can be omitted,
Moreover, it has been proved that it is possible to grow plants without arranging sprinklers and other sprinklers.

Example 3 An example of rooftop greening construction using the water-retentive solidified product for civil engineering produced by the present invention will be described below. In this example,
This is an example of rooftop greening of a five-story condominium, and is a comparative test in which two sections each having an area of 2 × 3 m ² are set in the same place. Section A is a section using the water-retentive solidified product for civil engineering according to the present invention, and B
The section is a section that does not use a water-retentive solidified product for civil engineering work. An impermeable sheet is laid at the bottom of both sections, and a water-retentive solidified material for civil engineering of 5 cm in thickness according to the present invention and 5 cm of sand having a diameter of 5 cm are laid on the upper part of the section, and medium particle soil is further laid above the section. Was laid for 10 cm to form a green ground foundation. A growth test was conducted by using an externally grown grass on the upper part. In addition, a tent was set up on the section so that there was no influence of rainwater from the outside. Immediately after attaching the grass, water was sprinkled until water came out of the drainage port, watering was stopped, and the growth condition was observed. A temperature sensor was installed on the surface of the center of each section to measure and compare the change in temperature, and the growth conditions of turf were also shown in Table 3. As a result, it was found that the water retention solidified material for civil engineering work according to the present invention replenishes water with the decrease of water content in the upper soil, and further has an extremely large effect of suppressing the rise in the surface temperature of the soil. Proved to make. This proved to be an extremely effective method not only for rooftop greening but also for parks, golf courses, road-related greening and slope greening.

[0016]

INDUSTRIAL APPLICABILITY The present invention relates to the production and construction of a water-retentive solidified product for civil engineering work, which retains both hydrophobic and water-retaining functions. When a water-retentive solidified product for main civil engineering work is used, the water in the water retention part causes a potential difference with a decrease in the water content of the soil part above it, moves into the soil by capillary infiltration and replenishes water, and When a large amount of water, such as heavy rain, etc., it is a material that can quickly discharge excess water to the outside through the hydrophobic part. That is, it is a functional material that prevents the soil portion from drying and discharges excess water. The present invention makes it possible to easily carry out greening projects, measures against ground drying, and the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a water-retentive solidified product for civil engineering work.

2 is a cross-sectional view taken along the line AA 'in FIG. 1, in which a reinforcing material is applied to the surface.

FIG. 3 is a cross-sectional view showing the construction of a water-retentive solidified product for civil engineering work and after the soil is made into the soil.

FIG. 4 is a cross-sectional view of water movement. (A) It is sectional drawing regarding the water movement of the soil part and the water retention part at the time of drying. (B) It is sectional drawing regarding the water movement of the soil part, the water retention part, and the hydrophobic part at the time of excessive water generation, such as rainfall.

FIG. 5 is a comparative diagram regarding the type of dry soil and water rise due to a capillary phenomenon.

[Explanation of symbols]

1 Water-retentive solidified material for civil engineering work 2 Hydrophobic part 3 water retention section 4 Hydrophobic material 5 Water retaining surface 6 Hydrophobic surface 7 Reinforcement material 8 Water retention part and soil part contact surface 9 Soil Department (Customer Soil Department) 10 Soil part (customer soil part) surface 11 Abutment surface of water retaining material for civil engineering 12 Underdrain 13 Water transpiration from soil (customer soil) 14 Water movement in water retention section 15 turf 16 impermeable sheet 17 Concrete foundation 18 Water sprinkling such as rainfall 19 Water permeation from soil to hydrophobic 20 Water permeation from the hydrophobic part to the base soil 21 Fine particle soil 22 Medium particle soil 23 Sandy soil

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E02D 17/20 102 E02D 17/20 102Z

Claims (4)

[Claims] 1. A manufacturing method for a member used for greening work, general civil engineering work, etc., wherein a hydrophobic part (underdrain effect part) and a water retention part are integrally held. 2. The method for producing a member according to claim 1, wherein a part or the whole surface of the water retaining portion is reinforced with a reinforcing material by integral molding or secondary processing. 3. A civil construction method relating to plant growth using the method according to claim 1. 4. A civil construction method for preventing dry soil by using the method according to claim 1.