JP2012012786A - Slope surface greening structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slope surface greening structure which is easy to execute, has excellent stability and water permeability/water retentivity, makes it difficult for weeds to overgrow, and also allows easy and safe walking on a surface layer surface.SOLUTION: The slope surface greening structure 1 includes: a surface layer 3 formed by placing a kneaded material of a soil material, a cement-based solidification material, a granulator and water to the slope surface 2a of soil 2 configuring a river bank 8; multiple lines of groove parts 4 extended along the horizontal direction crossing a gradient direction B of the slope surface 2a; and a greening area 5 formed by planting plants 5a inside the groove parts 4. The multiple lines of the groove parts 4 are provided at intervals in the gradient direction B of the slope surface 2a, and by planting the plants 5a respectively inside the groove parts 4, a belt-like greening area 5 continuously extended in the longitudinal direction (horizontal direction) of the groove parts 4 is formed.

Description

  The present invention relates to a technique for preventing erosion and collapse of a river bank or an inclined surface in a mountainous area and attaining greening.

  Slopes such as river embankments, embankment slopes, or slopes after logging timber and forest roads in mountainous areas can be easily eroded by rainwater, wind and snow, etc. In the past, there has been a mortar spraying method in which mortar is sprayed and stabilized on the slope.

  However, in the mortar spraying method, the grayish white mortar surface formed on the surface of the slope is conspicuous after construction, so the surrounding landscape is remarkably increased in tourist spots with many trees and river areas where flowers and flowers grow. make worse. Moreover, since the plant which absorbs a carbon dioxide and produces | generates oxygen by photosynthesis does not grow on the slope after mortar spraying, it is contrary to the request | requirement of the global warming prevention which is increasing in recent years. Therefore, a slope greening technique aimed at realizing both stabilization and greening of the slope has been proposed (see, for example, Patent Documents 1 and 2).

JP 2003-47330 A JP 2000-73370 A

  The slope revegetation technology described in Patent Documents 1 and 2 can stabilize the slope of the ground and promote greening, but the surface layer and the vegetation part formed on the slope of the ground have a complicated structure. Construction is not easy, and there is a high possibility that weeds will grow on the surface after construction. In addition, it is difficult to walk when a person goes up and down on the surface after construction.

  The problem to be solved by the present invention is a slope that is easy to construct, has excellent stability, water permeability and water retention, is difficult to grow weeds, and can easily and safely walk on the surface. To provide a greening structure.

  The slope revegetation structure of the present invention has a surface layer formed by placing a soil material, a cement-based solidifying agent, an aggregating agent and a water kneaded material on the slope of the ground, and intersects the slope direction of the slope. And a belt-like greening region formed by planting a plant in the groove.

  With such a configuration, the surface layer formed on the slope of the ground by the solidification action of the cement-based solidifying agent is as hard as asphalt pavement, and after construction, the roots of the plants planted in the groove are deep in the ground. Since the surface layer is fixed to the slope by stretching, it is excellent in stability. In addition, even if weed seeds fly on the surface of the surface, it is difficult to settle, and germination of weed seeds existing in the ground is also blocked by the hard surface, so that weeds can be prevented from growing.

  Further, in the surface layer immediately after the kneaded material is placed and before solidification, the soil material and the cement-based solidifying agent particles form a three-dimensional aggregate structure by the action of ions contained in the aggregate agent. Since continuous voids are generated in this aggregate structure, the solidified surface layer has a good balance between water permeability and water retention and has good air permeability. Therefore, a state suitable for the growth of the plant planted in the groove is formed, and it does not adversely affect organisms and bacteria in the ground below the surface layer, and is in harmony with the surrounding natural environment.

  In addition, a groove is provided in the surface layer formed by placing a kneaded material mixed with a soil material, a cement-based solidifying agent, an aggregating agent and water on the ground slope, and a plant is simply planted in the groove. The construction of greening slopes can be constructed, so construction is easy. In addition, since the surface of the surface layer after solidification has moderate irregularities based on the aggregate structure described above, it is difficult for the feet to slip, and the plants planted in the grooves become a foothold. You can walk easily and safely.

  Here, if a plurality of rows of groove portions are provided at intervals in the slope direction of the slope, a plurality of regions that become footholds are formed at intervals, so that it is easy to walk and during walking Safety is further improved.

  On the other hand, it is desirable that the aggregating agent contains a polymer compound composed of a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. If such an aggregating agent is used, a strong aggregate structure is formed during the solidification of the kneaded product, so that the water permeability and water retention are well balanced, air permeability is good, strength and A surface layer having excellent durability can be formed.

  According to the present invention, there is provided a sloped greening structure that is easy to construct, has excellent stability, water permeability and water retention, is difficult to grow weeds, and can easily and safely walk on the surface. Can do.

It is a vertical sectional view showing the slope greening structure which is an embodiment of the present invention. It is the figure seen from the arrow X direction in FIG. It is a figure which shows the manufacturing process of the kneaded material which is the raw material of the surface layer which comprises the slope greening structure shown in FIG. It is process drawing which shows the construction procedure of the slope greening structure shown in FIG.

  As shown in FIGS. 1 and 2, the slope greening structure 1 of the present embodiment includes a soil material 10, a cement-based solidifying agent 11, an aggregating agent 14, and a water kneaded material 15 shown in FIG. 3 described later. A surface layer 3 formed by being cast on the slope 2a of the ground 2 constituting the river dike 8, and a plurality of rows of grooves 4 extending along the horizontal direction H intersecting the gradient direction B of the slope 2a; The greening region 5 formed by planting a plant 5a in the groove 4 is provided. The plurality of rows of grooves 4 are provided at intervals in the gradient direction B of the slope 2a, and each plant 5a is planted in each of these grooves 4 so as to be continuous in the longitudinal direction (horizontal direction R) of the grooves 4. A belt-like greening region 5 extending in the direction is formed. In the present embodiment, two rows of greening regions 5 are formed by planting the plants 5a in the two rows of groove portions 4, respectively, but the number of rows, the width, the length, etc. of the groove portions 4 and the greening regions 5 etc. Is not limited, and can be set according to the construction conditions.

  Here, based on FIG. 3, FIG. 4, the construction procedure of the slope greening structure 1 is demonstrated. As shown in FIG. 3, the soil material 10 and the cement-based solidifying agent 11 are put into a mixer 12 and sufficiently stirred and mixed. As the mixer 12, a mixer 12 having a stirring and mixing function using the motor 13 or the like as a power source can be used. As the soil material 10, it is possible to use pure sand, shirasu, incinerated ash, or earth and sand collected from the ground 2 which is a construction planned site of the sloped greening structure 1. In addition, instead of the soil material 10 or in combination with the soil material 10, a waste material of tile, a waste material of glass, or a pulverized material of molten slag can be used.

  When the soil material 10 and the cement-based solidifying agent 11 are uniformly mixed, the aggregating agent 14 containing a polymer compound composed of a composite of magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. And kneaded product 15 is formed by adding water and further stirring and kneading. In addition, since the stirring and mixing means is not limited, it can be mixed using a backhoe instead of the mixer 12 described above.

In this embodiment, the mixing ratio of each component constituting the kneaded material 15 is as follows, but is not limited thereto.
Soil material 10: 1000kg-1500kg
Cement-based solidifying agent 11: 100 kg to 200 kg
Aggregating agent 14: 1 liter to 10 liter water: appropriate amount (adjustment amount is adjusted while confirming the fluidity and hardness of the kneaded material 15)

  On the other hand, as shown in FIG. 4 (a), on the slope 2a of the ground 2 at the construction site, a plurality of rows of grooves 4 are formed along the horizontal direction H (see FIG. 2) intersecting the gradient direction B, The mold material 6 is inserted into each of the groove portions 4. The vertical cross-sectional shapes of the groove 4 and the mold member 6 are both rectangular, but the depth 6a of the mold member 6 is larger than the depth 4a of the groove 4, so that the mold inserted in the groove 4 is used. A part of the frame 6 on the upper surface 6b side protrudes from the slope 2a.

  Next, the kneaded product 15 obtained in the kneading step shown in FIG. 3 is driven on the slope 2a of the ground 2 to form the surface layer 3, as shown in FIG. 4 (b). Although the construction method for placing the kneaded material 15 is not limited, for example, it can be applied using a mortar spray gun 7 connected to a mortar spray pump (not shown). In the present embodiment, the kneaded material 15 is driven to such an extent that the upper surface 6b of the mold member 6 and the surface 3a of the surface layer 3 are substantially flush with each other. However, the present invention is not limited to this. The thickness of the surface layer 3 can be adjusted by increasing / decreasing the placement amount of 15.

  After the kneaded material 15 is placed and cured for about 15 hours and the surface layer 3 is sufficiently solidified, the mold material 6 is detached from the surface layer 3 and opened on the surface 3a of the surface layer 3 as shown in FIG. The seedling 5b of the plant 5a is planted in the groove part 4 which has become the finished state. Thereafter, when the number of days elapses, the plant 5a grows in the groove portion 4, and eventually, as shown in FIG. 2, a greening region 5 continuous in a belt shape is formed, and the slope greening structure 1 is completed.

  As shown in FIG. 1, in the slope greening structure 1, the surface layer 3 formed on the slope 2 a of the ground 2 by the solidification action of the cement-based solidifying agent 11 is as hard as asphalt pavement. Since the root 5c of the plant 5a planted on the surface is stretched deeply in the ground 2, the surface layer 3 is fixed to the slope 2a, which is excellent in stability. Further, even if weed seeds fly on the surface 3a of the surface layer 3, it is difficult to settle, and germination of weed seeds existing in the ground 2 is also blocked by the hard surface layer 3, so that weeds can be prevented from prospering. .

  Further, as shown in FIG. 4B, in the surface layer 3 immediately after the kneaded material 15 is placed and before solidification, the soil material 10 is produced by the action of ions contained in the aggregating agent 14 (see FIG. 3). And the cement-based solidifying agent 11 particles form a three-dimensional aggregate structure, and continuous voids are generated in the aggregate structure. Therefore, the solidified surface layer 3 has a good balance between water permeability and water retention. In addition, the air permeability is also good. Therefore, a state suitable for the growth of the plant 5a planted in the groove part 4 is formed, and it does not adversely affect the organisms and bacteria in the ground 2 below the surface layer 3, and harmonizes with the surrounding natural environment.

  Further, the groove portion 4 is provided in the surface layer 3 formed by placing the kneaded material 15 obtained by mixing the soil material 10, the cement-based solidifying agent 11, the aggregating agent 14, and water on the slope 2 a of the ground 2. Since the greening slope structure 10 can be constructed only by planting the seedlings 5b of the plant 5a in 4, the construction is easy. Moreover, since the moderate unevenness | corrugation based on the aggregate structure mentioned above is formed in the surface 3a of the solidified surface layer 3, a leg | foot is hard to slip, and the plant 5a planted in the groove part 4 becomes a footrest of a pedestrian. Therefore, it is possible to walk easily and safely on the surface 3a of the surface layer 3.

  Further, in the slope greening structure 1, by providing a plurality of rows of groove portions 4 at intervals in the gradient direction B of the slope 2a, a plurality of rows of greening regions 5 to be used as a foothold are formed. It is effective for ensuring ease of walking and safety during walking. Further, as shown in FIG. 1 and FIG. 2, the presence of a plurality of greening regions 5 that are continuous in a belt shape in a substantially horizontal direction causes a surface on the surface 3 a along with rainwater flowing along the surface 3 a of the surface layer 3. Since the earth and sand that flows down remain in each greening region 5, it is possible to prevent the earth and sand from accumulating at the lowest part of the surface 3a of the surface layer 3.

  On the other hand, as the aggregating agent 14, the kneaded material 15 was solidified by using a polymer containing a polymer compound composed of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. Therefore, the surface layer 3 has a good balance between water permeability and water retention, good air permeability, and excellent strength and durability.

  In addition, since the formation method of the groove part 4 and the greening area | region 5 is not limited to the construction method shown in FIG. 4, before the kneaded material cast on the slope of another construction method hardens, it is planted in a belt shape. A method of planting seeds or planting plant seeds, a method of planting plant seedlings in a groove in the horizontal direction H formed on the surface layer after solidification, or a method of planting plant seeds can also be employed. Moreover, although it does not limit also about the kind of the plant 5a shown in FIG.

  In the present embodiment, the groove 4 is formed in a straight line along the horizontal direction H intersecting the gradient direction B of the slope 2a. However, the present invention is not limited to this, and the gradient direction B of the slope 2a By forming a continuous groove part that draws a wave shape, mountain valley shape or irregular zigzag along the intersecting direction, and planting the plant, the shape extended in a substantially horizontal direction when viewed as a whole A greening region can be formed.

  The slope revegetation structure of the present invention can be widely used as a revegetation technique for a slope such as a river bank, a slope of embankment, or an inclined face after logging of a timber in a mountainous area or after a forest road is constructed.

DESCRIPTION OF SYMBOLS 1 Slope greening structure 2 Ground 2a Slope 3 Surface layer 3a Surface 4 Groove part 4a Depth 5 Greening region 5a Plant 5b Seedling 5c Root 6 Form material 6a Depth 6b Upper surface 7 Mortar spray gun 8 River dike 10 Soil material 11 Cement system solidification 11 Agent 12 Mixer 13 Motor 14 Aggregating agent 15 Kneaded product

Claims (3)

  A surface layer formed by placing a soil material, a cement-based solidifying agent, an aggregating agent and a kneaded mixture of water on the slope of the ground, and extending along a direction crossing the slope direction of the slope. A sloped greening structure comprising a groove part and a belt-like greening region formed by planting a plant in the groove part.   The slope greening structure according to claim 1, wherein a plurality of rows of the groove portions are provided at intervals in the slope direction of the slope.   The slope according to claim 1 or 2, wherein the aggregating agent comprises a polymer compound comprising a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. Greening structure.

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