JP2992987B2 - Greening concrete and its forming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to greening concrete and a method for forming the same, and more particularly to greening concrete formed on a concrete surface coated on an inclined ground such as embankment for protection of a slope and a method for forming the same. About.

[0002]

2. Description of the Related Art Slope of embankment, cut and other sloped ground is
It must be protected by appropriate means to prevent damage from erosion, peeling, rock fall, etc.

[0003] As a means for protecting the slope, there is a vegetation method which is relatively inexpensive and widely used. On rocks and steep slopes, instead of the vegetation method, a protection method using an RC structure or the like is used. It is indispensable to prevent rocks and rocks that are easily weathered or cracked from falling or falling by applying concrete or mortar to cover the entire slope.

On the other hand, there is an increasing need for greening concrete surfaces from the viewpoint of environmental protection.
Various technologies for greening concrete surfaces have been researched and developed.

FIG. 5 shows an example of a conventional technique for greening a concrete surface, in which a concave portion 3 is formed on the surface of concrete 2 covered on a sloping ground 1, and the concave portion 3 is composed of a seed and a binder. The vegetation base 4 is embedded. Then, the seeds embedded in the vegetation base 4 germinate, and the plant 5 grows with roots in the base 4 soon. In addition, there is a method in which concrete with many voids is cast and soil, fertilizer, and seeds are embedded in the voids.

[0006]

However, all of the methods are complicated and time-consuming, and considerable time and cost are required for greening a wide area.

[0007] In addition, if the existing concrete slope that was constructed without considering the greening is to be greened later,
In some cases, it may be necessary to remove all the concrete and mortar sprayed on the slope, and in such a case, the cost of removing the existing concrete is further required.

[0008] Therefore, at present, it is impossible to take fundamental measures for greening, and only to spray green paint.

Further, as a method for suppressing alkali content in concrete that inhibits plant growth, a method of mixing a weakly acidic neutralizing agent or using a low-alkali cement has been proposed. Therefore, a technology that can further reduce costs has been awaited.

The present invention has been made in view of the above circumstances, and provides a green concrete and a method of forming the same, which can improve the construction efficiency, particularly when the existing concrete slope is greened. The purpose is to:

Another object of the present invention is to provide a green concrete and a method for forming the same, which can avoid the influence of alkali in the concrete.

[0012]

In order to achieve the above object, a method for forming greenery concrete according to the present invention, as described in claim 1, covers a seed of a plant with a predetermined coating or in a predetermined capsule. While enclosing to form a coated seed body, a step of mixing concrete so that cracking after casting is promoted, a step of mixing the coated seed body in the concrete, and a step of mixing the coated seed body Casting concrete in a predetermined position and hardening the concrete. According to the method for forming green concrete of the present invention, after the concrete is cast, the cast surface is dried to promote drying shrinkage.

[0013] The green concrete of the present invention is described in the claims.
As described in 3 , the coated seed body formed by covering the seeds of the plant with a predetermined coating or encapsulating in a predetermined capsule is placed in a concrete compounded so as to promote cracking after casting. And cured.

Further, the greening concrete of the present invention is configured such that the coating or the capsule according to claim 3 is cracked or softened by expansion and contraction due to repeated moisture absorption and drying.

Further, the greening concrete of the present invention is configured such that the coating or the capsule according to claim 3 is cracked or softened by decomposition by the action of alkali.

Further, the greening concrete of the present invention is configured such that the coating or the capsule according to claim 3 is cracked or softened by expansion and contraction of the surrounding concrete.

[0017]

In the green concrete and the method of forming the same according to the present invention, first, a seed of a plant is covered with a predetermined coating or encapsulated in a predetermined capsule to form a coated seed body.

Next, the coated seed body is mixed into a predetermined concrete. Here, when compounding the concrete, for example, a unit water amount is increased or a mineral that changes the volume is mixed so as to easily cause cracking during or after hardening.

Finally, concrete mixed with the coated seed body is cast at a predetermined position, for example, an existing slope to which concrete, mortar or the like is sprayed, with a thickness of several cm, for example, to form greening concrete. Here, when the degree of cracking is considered to be small, the casting surface is not wet-cured as usual, but the surface is dried to promote drying shrinkage.

Here, concrete generally has a pH of 1
2 to 13 are strongly alkaline and are not suitable for germination and growth of plants. However, in the present invention, since the seeds of the plant are covered with a coating or capsule, the seeds are protected from alkali content in concrete. You.

After the green concrete is formed, cracks occur on the surface of the green concrete with the lapse of time, and the alkali content of the concrete in the vicinity is neutralized by carbon dioxide in the air.

On the other hand, the cracks generated on the surface eventually reach the coated seed body.

Here, when the coating or the capsule is constituted so as to generate cracks or soften due to expansion and contraction due to repeated moisture absorption and drying, the coating or the capsule expands and contracts due to moisture repeatedly flowing from cracks, and eventually the coating or the like. Breaks.

Similarly, when a crack is formed or softened by decomposition by the action of an alkali,
Decomposed by alkali content in surrounding concrete,
Eventually, the film or the like will be broken.

When a crack or softening is caused by expansion and contraction of the surrounding concrete, the coating or capsule buried in the concrete is forcibly deformed by expansion and contraction of the surrounding concrete and the crack is generated. Is generated.

When the capsule or capsule is broken by such an external action, air or water is supplied to the inside of the capsule or the like along the crack, and the seed germinates soon. Then, the plant grows by growing the shoots along the cracks where the alkali is already neutralized.

[0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a green concrete and a method of forming the same according to the present invention. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

FIG. 1 is a flowchart showing the procedure of the method for forming greenery concrete according to the present embodiment.

As can be seen from the figure, in the method of forming greenery concrete according to the present embodiment, first, as shown in FIG. Is formed (FIG. 1, step 101).

Here, the coating 12 is configured to crack or soften due to expansion and contraction due to repeated moisture absorption and drying. The coating 12 is made of, for example, clay whose volumetric expansion is remarkable due to moisture absorption, a material obtained by immersing paper in water to separate fibers and then hardening, a rice bran or soybean meal to which water is added to form a dumpling, a glue for wood chips. It is preferable to use a material that has been hardened by adding a solid.

On the other hand, apart from step 101, concrete is compounded so as to easily cause cracking during or after hardening (FIG. 1, step 102). In order to easily cause cracks, for example, the unit water amount may be increased, or a mineral such as montmorillonite which is a main component of bentonite may be mixed.
Such minerals undergo significant volume changes under repeated wet and dry conditions, causing the concrete to expand and crack. Also, usually, actively utilize the alkali-aggregate reaction that should be suppressed to deteriorate the durability of concrete,
That is, volume expansion due to a reaction between a predetermined aggregate and an alkali component in concrete may be used.

Next, the coated seed body 13 is mixed into the concrete (step 103 in FIG. 1), and the concrete mixed with the coated seed body 13 is removed from the existing concrete as shown in FIG. 2 (b). The slope 15 is sprayed with a thickness of, for example, several centimeters and hardened to form a green concrete 16 (FIG. 1, step 104).

Before spraying the concrete mixed with the coated seed body 13 onto the existing concrete slope 15,
A wire mesh or net is stretched and fixed on the existing slope 15 as necessary to prevent concrete from flowing. If the degree of cracking is considered to be small, the surface on which the green concrete 16 is cast is not wet-cured as usual, but the surface is dried to promote drying shrinkage.

FIG. 3 shows a state after the greening concrete 16 is formed.

Immediately after the greening concrete 16 is cast,
As can be seen from FIG. 3 (a), the coated seed body 13 is buried in concrete, but since the seed 11 is covered with the coating 12, the seed 11 is protected from alkali in the concrete.

When a predetermined time has elapsed after the greening concrete 16 has been cast, many cracks 21 are formed on the surface of the greening concrete 16 as shown in FIG. The minutes are neutralized by reacting with carbon dioxide in the air. On the other hand, the cracks 21 generated on the surface eventually reach the coated seed body 13.

Here, the coating 12 of the coated seed body 13 expands and contracts due to moisture repeatedly flowing from the cracks 21, and eventually the coating 12 is broken. The thickness and material of the coating 12 are adjusted or selected so that the crack 21 is first formed on the surface of the green concrete and then the coating is broken at a stage where the neutralization reaction near the crack has progressed to some extent.

When the coating 12 is broken by such an external action, air or water is supplied to the inside of the coating 12 along the cracks 21, and the seed 11 eventually germinates as shown in FIG. 3 (c). Then, the plant grows by growing the buds 22 along the cracks 21 in which alkali has already been neutralized.

As described above, according to the greening concrete and the method for forming the same according to the present embodiment, the seeds of the plant mixed with the concrete are covered with the predetermined coating, so that the alkali content around the seeds is somewhat medium. Until the seeds are unified, the seeds can be protected from the alkali content of the concrete, and the germination failure due to the alkali can be prevented.

Further, according to this embodiment, since many cracks are generated on the concrete surface, a space for retaining water, a space for ventilation, or a space for germination growth is secured. The surface area of the concrete in contact with the air increases, and the neutralization reaction of the concrete with carbon dioxide in the air proceeds, thus forming an environment necessary for plant growth.

Further, according to the present embodiment, greening concrete can be formed only by mixing the coated seed body into concrete and spraying it on a predetermined slope, so that the existing concrete slope can be used. However, it can be greened in a short period and on a large scale.

In this embodiment, the seeds of the plant are covered with the coating, but this may be encapsulated in a capsule.

In this embodiment, the coating is broken by expansion and contraction due to repeated moisture absorption and drying.
A material that decomposes by the action of an alkali, for example, polyester, polycarbonate, polyurethane, or the like that hydrolyzes by an alkali may be used.

Alternatively, a crack may be formed by expansion and contraction of concrete. For example, the thickness μ
It is good to make a plastic of m. In such a configuration, the capsule buried in the concrete is forcibly deformed by expansion and contraction of the surrounding concrete, causing a crack and eventually breaking.

Although not specifically mentioned in the present embodiment, when the voids required for plant growth are insufficient due to cracks generated on the concrete surface, porous concrete can be used without using fine aggregates. If the water retention is insufficient, replace a part of the coarse aggregate with a material with high water absorption, such as cork, nonwoven fabric, polyurethane, etc., or if the neutralization with carbon dioxide in the air is insufficient, It is preferable to use a low alkaline cement or mix a weakly acidic neutralizer.

In this embodiment, the greening concrete is formed on the existing concrete slope. However, the present invention is not limited to this case. For example, the greening concrete of the present invention may be placed on a bedrock where it is difficult to vegetate. May be formed.

In this embodiment, the greening concrete is cast on site, but it may be precast concrete. For example, in the case of manufacturing an RC precast block used for slope protection of a river, as shown in FIG. 4, according to the present embodiment, greening concrete 31 is manufactured in advance as a precast plate with a thickness of about several cm, for example. Is affixed to the inside of the mold 32, and another mold 33 is arranged opposite to the mold 32 to arrange a predetermined reinforcing bar 34.
5, the RC block 36 may be manufactured.

In such a configuration, the RC block 36
Has a normal RC structure, but its surface layer is greened by the greening concrete of this embodiment.

[0049]

As described above, according to the method for forming greenery concrete of the present invention, the seeds of a plant are covered with a predetermined coating or encapsulated in a predetermined capsule as described in claim 1. Forming the body, mixing concrete so that cracking after casting is promoted, mixing the coated seed body in the concrete, and placing the concrete mixed with the coated seed body in a predetermined position. Since it includes a step of casting and hardening, it can improve the work efficiency when constructing greening concrete, especially the workability when greening existing concrete slopes, and the effect of alkali content in concrete And greening concrete suitable for plant growth can be produced.

The green concrete of the present invention is described in the claims.
As described in 3 , the coated seed body formed by covering the seeds of the plant with a predetermined coating or encapsulating in a predetermined capsule is placed in a concrete compounded so as to promote cracking after casting. Mixed and hardened, it can improve construction efficiency, especially work efficiency when greening existing concrete slopes, and is suitable for plant growth by avoiding the effect of alkali in concrete. You can create an environment.

[0051]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure of a method for forming greenery concrete according to the present embodiment.

FIG. 2 (a) is a schematic diagram showing a state in which a seed of a plant is covered with a predetermined coating to form a coated seed body, and (b) is a concrete in which the coated seed body is mixed is sprayed onto an existing concrete slope. Schematic diagram showing the situation.

FIG. 3 is a cross-sectional view showing the progress after greening concrete has been cast.

FIG. 4 is a cross-sectional view showing how to manufacture a precast concrete block in which greening concrete of the present embodiment is attached to the surface.

FIG. 5 is a vertical sectional view showing a conventional technique for forming a vegetation base on a concrete slope.

[Explanation of symbols]

 101 Coated seed body forming step 102 Concrete mixing step 103 Mixing step 104 Planting step 11 Plant seed 12 Coating 13 Coated seed body 16 Greening concrete 21 Crack 31 Greening concrete (made of precast) 36 Precast concrete block

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-119902 (JP, A) JP-A-5-272142 (JP, A) JP-A-5-33319 (JP, A) JP-A-51- 139104 (JP, A) JP-A-50-118516 (JP, A) JP-B-48-3406 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 17/20 102 E02D 17/20 104 A01C 1/00-1/08

Claims (6)

(57) [Claims] A step of coating a plant seed with a predetermined coating or encapsulating in a predetermined capsule to form a coated seed body, and mixing concrete so as to promote cracking after casting; A method for forming greening concrete, comprising: a step of mixing the coated seed body into the concrete; and a step of casting and hardening the concrete mixed with the coated seed body at a predetermined position. 2. The method for forming greening concrete according to claim 1, wherein after casting the concrete, the casting surface is dried to promote drying shrinkage. 3. A coated seed body formed by coating a plant seed with a predetermined coating or encapsulating in a predetermined capsule is mixed into concrete mixed so as to promote cracking after casting. Greening concrete characterized by being cured. 4. The greening concrete according to claim 3, wherein the coating or the capsule is configured to crack or soften due to expansion and contraction due to repeated moisture absorption and drying. 5. The greening concrete according to claim 3, wherein the coating or the capsule is configured to crack or soften by decomposition by the action of an alkali. 6. The green concrete according to claim 3, wherein the coating or the capsule is configured to crack or soften due to expansion and contraction of the surrounding concrete.