JP4232960B2 - Embedded solidified layer greening method - Google Patents

Description

The present invention relates to an embedded solidified layer greening method required for disposing a solidified layer mainly composed of pure sandy soil in the soil, planting a plant on the solidified layer, and suppressing the growth of the plant and extending the root system. . Further, the present invention relates to a buried solid layer greening method required for maintenance of plant generating materials.

The conventional tree planting method emphasizes how strong vegetation is formed on the slope. Various methods have been devised, including the following methods.
A spraying method in which the seeds of the coated plant are fixed to the slope using a special glue, a framework method of assembling a concrete fence and planting the coated plant in it, and covering the entire slope with concrete. There is a method of placing a thick lawn. In any of these methods, concrete is used, and in particular, when a buried solid layer is made of concrete, water permeability and water retention of the concrete layer are not expected at all. In addition, since the growth of plants is hindered by the lye leached from the concrete, it is fully expected that the lawn will peel from the concrete slab surface.

Furthermore, the spraying method and the framework method are methods for forming vegetation on the slope, and no consideration is given to maintenance after vegetation formation. That is, in these methods, plants such as planted lawns need to be trimmed to a certain height and are trimmed by a brush cutter, but work on slopes is dangerous. In addition, weeds such as scraps and pampas grass are likely to invade, and the weeds that have invaded increase in size as they are left unattended, so that weed control by regular mowing or hand-picking is necessary to maintain the vegetation of the dressed plants. Furthermore, a great deal of labor and energy is required for plant management such as collection, transportation, and disposal of plant-generated materials such as weeds.
Further, since concrete is used in the above-mentioned spraying method and framework method, it is an extremely important issue that any of these must be disposed as industrial waste.
As described above, there is a limit to the use of any tree planting method, and it cannot be put into practical use as it is.

Therefore, the present invention provides a solidified layer mainly composed of pure sand soil in the soil, and uses a natural material different from concrete for the solidified layer and the solidified plate, thereby suppressing the growth of the plant and replanting the solidified layer greening required for root system elongation. The construction method is provided. In addition, we will reduce the costs required for vegetation management after construction, such as reducing the invasion of weeds and eliminating the need to cut vegetation plants such as lawns, and a recycling-type greening method that emphasizes waste reduction. It is to provide.

Therefore, the present invention focuses on the growth amount of the above-ground part of the plant and the growth amount of the root part is always in a constant relationship, and the root region is limited by laying a solidified layer in the soil to control the growth of the covered plant. In addition, the solidified layer is not a concrete, but is characterized by using a natural material mainly made of pure sand soil having excellent water permeability and water retention.
In order to achieve the above object, the embedded solidified layer greening method according to claim 1 is provided with water permeability and water retention at a depth of a root portion in which the growth amount of the above-ground portion of the plant can be limited to a predetermined height in the soil. Forming a solidified layer, and the solidified layer is composed of a composition mixture containing 70 to 80% by weight sand sand, 3 to 5% Portland cement, and a suitable amount of a nonionic surfactant;
It is characterized by planting a covering plant such as Koba Shiba, Noshiba, Shibazakura on the solidified layer.
The invention of claim 2 is characterized in that the thickness of the solidified layer is 10 mm or more corresponding to the plant-specific plant height.
The invention of claim 3 is characterized in that drainage pores for infiltration of rainwater are provided at the bottom of the solidified layer.

In the present invention, since the depth can be set by disposing a solidified layer, the growth of plants can be controlled, cutting of planted plants such as lawns is not required, and weed invasion can be suppressed. Further, the plant root system can be extended and roots can be stretched on the solidified layer, so that the roots do not flow out. Furthermore, on the slope, the plant is constructed in a stepped or wavy solidified layer and provided with drainage pores, so that plants do not flow out even in heavy rain.
Furthermore, since a natural material different from concrete is used for the solidified layer and the solidified board, it is possible to reduce the cost required for soil degradation, waste reduction, and vegetation management after construction.

Embodiments of the present invention will be described with reference to FIGS. 1, 2, 3, 4, and 5, and Table 1. FIG.
FIG. 1 is a conceptual diagram showing plant suppression by root zone restriction. It is known that the S / R ratio, which is the relationship between plant height and root length, is always in a constant relationship, and artificially limiting the underground space where roots grow is called root zone restriction. Plant height can be suppressed by limiting. The left figure of this figure shows the state without root area restriction, and there is no restriction on the length of the plant because there is no restriction on the root length. In this figure, where the root zone is moderately restricted in the soil, the root length only grows within the restricted range and grows to a plant height according to the amount. The figure on the right side of the figure shows that the root restriction is extremely shallow, so that the length of the root length is extremely suppressed and the growth of the plant height is strongly suppressed.

Based on this concept, FIG. 2 illustrates an embodiment of the embedded solidified layer greening method of the present invention.
An embedded solidified layer 1 having a thickness of 10 mm was laid in a soil having a depth of 30 mm, and a plant 3 covered with cucumber shiba, enokorogusa, himeshiba, oyster rush, and dolphins was planted on the soil layer 2 provided thereon.
The composition of the embedded solidified layer 1 is composed of pure sand as a basic composition, and a composition mixture containing a small amount of cement and a surfactant. By weight, the pure sand is 70 to 80%, cement is 3 to 5%, and nonion. A composition mixture of an appropriate amount of the system surfactant was prepared. The pure sand was made of weathered granite, etc., from the sand of the mountain, excluding clay such as volcanic ash. The surfactant was a nonionic surfactant, a nonylphenyl ether polymer having 6 to 7 carbon atoms, and a saturide manufactured by DEBCO PTY.LIMITED in Australia.
The embedded solidified layer 1 has both water permeability and water retention. As a result, the plant height of each plant grew in 2 months.
The growth situation is shown in Table 1.

As shown in Table 1, by setting a solidified layer in the soil, the plant height for the non-construction zone is suppressed from 19.6% to 31.1% in the weeds such as Enocorosa and Himeshiba, although the effect is slightly inferior to 69.0% in the moss. It was. Furthermore, weed control and pruning were reduced, and it became clear that this construction method was extremely effective. In addition, it is thought that the cause with a small inhibitory effect with respect to a mulberry is that a mulberry is originally a plant with low plant height, and the effect is hard to appear.

The above is the embodiment of the embedded solidified layer greening method in the planar soil. Next, the embodiment in the slope is shown in FIG. 3, and the modified embodiment of the fixed anchor is shown in FIG.
The slope is excavated to an arbitrary depth, and the excavated soil surface is averaged as much as possible. Depending on the soil quality, the sand layer 4 is about 10 mm in order to keep moisture movement between the buried solidified layer 1 and the soil. Lay on thickness. The thickness of the embedded solidified layer is generally in the range of 20 to 2,000 mm from the viewpoint of durability, strength, etc., but in places where high strength is required such as river bank slopes and road slopes, The thickness of the embedded solidified layer is increased to 1,000 to 2,000 mm. Further, depending on the inclination angle of the construction site, the fixed anchor 5 is hit against the soil or the wire 6 is attached to the fixed anchor 5 and the embedded solid layer 1 is suspended by the wire 6 in order to prevent the embedded solid layer from sliding down. In this case, the interval and depth of hitting the fixed anchor 5 are determined by the thickness of the embedded solidified layer 1 and the inclination angle.

In addition, the shape of the upper part of the embedded solidified layer needs to be devised so that the soil above the formed solidified layer does not flow out and is easily fixed. A structural diagram of the solidified plate 11 is shown in FIG.
The shape of the upper part of the buried solidified layer is not a flat shape but a stepped or wavy shape so that the soil is easily fixed. In order to construct in this shape, the solidified plate 11 having the shape is formed. Furthermore, since the solidified layer 1 itself has water permeability, in normal rainfall, rainwater passes through the solidified layer 1 and permeates into the underlying soil. However, the plant system is separated from the embedded solidified layer slab surface by extreme heavy rain. Therefore, drainage pores 7 for rainwater infiltration are provided at the bottom of the solidified plate. After laying the solidified layer 1 on the solidified plate 11, it is possible to plant a plant such as pearl millet or shibazakura by placing soil on the solidified layer slab.

The present invention can be used on road shoulders, median strips, etc. on flat ground, and on river dikes, roads, farmland lakeside slopes, etc. on slopes.

Conceptual diagram of plant suppression by root zone restriction The embedded solidified layer greening method showing one embodiment of the present invention Examples of slopes Example of changing fixed anchor on slope Solidified plate structure on the slope

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Embedded solidified layer 2 Soil layer 3 Covered plant 4 Sand layer 5 Fixed anchor 6 Wire rope 7 Drainage pore 11 Solidified board

Claims (3)

In the soil, forming a solidified layer with water permeability and water retention at the depth of the root that can limit the growth amount of the above-ground part of the plant to a predetermined height,
The solidified layer is composed of a composition mixture containing 70 to 80% pure sand soil, 3 to 5% Portland cement, and an appropriate amount of a nonionic surfactant by weight,
An embedded solidified layer replanting method characterized by planting a covered plant such as Koba Shiba, Noshiba, Shibazakura on the solidified layer. The embedded solidified layer revegetation method according to claim 1, wherein the solidified layer has a thickness of 10 mm or more corresponding to the plant-specific plant height. The embedded solidified layer greening method according to claim 1 or 2, wherein drainage pores for infiltration of rainwater are provided at the bottom of the solidified layer.