JP5610188B2 - Tree planting structure using wood chip concrete - Google Patents

Tree planting structure using wood chip concrete Download PDF

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JP5610188B2
JP5610188B2 JP2010019810A JP2010019810A JP5610188B2 JP 5610188 B2 JP5610188 B2 JP 5610188B2 JP 2010019810 A JP2010019810 A JP 2010019810A JP 2010019810 A JP2010019810 A JP 2010019810A JP 5610188 B2 JP5610188 B2 JP 5610188B2
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JP2011157714A (en
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十河　潔司
潔司 十河
杉本　英夫
英夫 杉本
邦彦 浜井
邦彦 浜井
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Obayashi Corp
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Description

本発明は、河川堤防や崖地等の法面を主として緑化するのに用いられる木片コンクリートを用いた緑化構造に関する。   The present invention relates to a greening structure using wood chip concrete used mainly for greening slopes such as river banks and cliffs.

造成地の盛土や切土、道路の盛土、河川堤防等に見られる傾斜地においては、適当な手段でこれを保護することにより、法面の侵食、剥離、落石等を未然に防止しなければならない。   On slopes found in embankments and cuts, road embankments, river embankments, etc., it is necessary to prevent slope erosion, delamination, and falling rocks by protecting them with appropriate means. .

法面を緑化によって保護する方法としては、植物の種子、肥料、水、チップ材、粘着剤等を攪拌混合した水性スラリーからなる植生基材を法面に吹き付ける方法が採用されてきたが、植物の定着と生育を図るためには、植生基材を十分な厚さで吹き付けなければならず、材料コストや施工コストが高くなりがちであった。   As a method for protecting the slope by greening, a method has been adopted in which a vegetation base material composed of an aqueous slurry obtained by stirring and mixing plant seeds, fertilizer, water, chip material, adhesive and the like is sprayed on the slope. In order to establish and grow the vegetation, the vegetation base must be sprayed with a sufficient thickness, which tends to increase the material cost and construction cost.

一方、セメントミルクあるいはフレッシュモルタルと木片とが混合されてなる混練物を法面に吹き付け、あるいは該混練物を予め硬化させてなる木片コンクリート板を法面に敷設し、その上に植生基材を積層する技術が本出願人によって開発された。   On the other hand, a kneaded mixture of cement milk or fresh mortar and wood pieces is sprayed on the slope, or a wood concrete board made by pre-curing the kneaded material is laid on the slope, and a vegetation base material is placed on it. A technique for laminating was developed by the applicant.

かかる木片コンクリートによれば、植生基材で成長した植物の根が木片の間隙に伸張することによって自立性が向上し、かくして木片コンクリートの上に積層すべき植生基材を従前よりも薄くすることが可能となり、全体の緑化コストを大幅に低減することができるようになった。   According to such wood chip concrete, the root of the plant grown on the vegetation base material is extended by the gap between the wood pieces, so that the self-supporting property is improved, and thus the vegetation base material to be laminated on the wood piece concrete is made thinner than before. And the overall greening cost can be greatly reduced.

特開平８−４０１７号公報JP-A-8-4017 特開２００４−９２０３８号公報JP 2004-92038 A 特開２００４−８４４１５号公報JP 2004-84415 A 特開２００４−８４４０２号公報JP 2004-84402 A

ここで、緑化による法面保護は、法面の浸食等を防止することが目的である関係上、できるだけ成長の早い植物で法面を覆うことが必要とされ、そのために在来種よりも成長の早い外来種が多用される。   Here, because the purpose of slope protection by greening is to prevent slope erosion, etc., it is necessary to cover the slope with a plant that grows as fast as possible. Early alien species are often used.

しかしながら、このような外来種を用いた場合、法面保護ひいては防災機能の確保を早期に実現できるものの、外来種ゆえの旺盛な成長により、成長し過ぎた植物に対する刈り取り等の維持管理が大きな負担になるという問題を生じていた。加えて、成長力の強い外来種が在来種を駆逐するのではないかという生態系への影響も懸念されていた。   However, when such alien species are used, the slope protection and thus the disaster prevention function can be secured at an early stage, but due to vigorous growth due to the alien species, maintenance and management such as harvesting for overgrown plants is a heavy burden. The problem of becoming. In addition, there were concerns about the impact on the ecosystem that alien species with strong growth might destroy native species.

本発明は、上述した事情を考慮してなされたもので、維持管理の負担を軽減するとともに生態系への影響を最小限にとどめることが可能な木片コンクリートを用いた緑化構造を提供することを目的とする。   The present invention has been made in consideration of the above-described circumstances, and provides a tree planting structure using wood chip concrete that can reduce the burden of maintenance and minimize the impact on the ecosystem. Objective.

上記目的を達成するため、本発明に係る木片コンクリートを用いた緑化構造は請求項１に記載したように、緑化の対象となる地盤表面の少なくとも一部が露出領域として露出するように該地盤表面を被覆層で被覆し、該被覆層を、植生基材が積層されない木片コンクリートの単一層で構成するとともに、前記露出領域のみを植栽の範囲としてなり、前記木片コンクリートを、多数の木片を該木片同士に間隙が生じるようにセメント含有物質で相互に固結させることにより、前記木片同士の間隙に植物の根が伸張して該木片に絡みつき又は該間隙を介して植物の根が地盤に伸張し、前記被覆層で被覆された領域に前記露出領域の植生が拡大するようになっているものである。 In order to achieve the above object, the greening structure using wood chip concrete according to the present invention has a ground surface such that at least a part of the ground surface to be greened is exposed as an exposed region. was coated with the coating layer, the coating layer, with the vegetation base material is composed of a single layer of wood concrete not laminated becomes a range of planting only the exposed area, the piece of wood concrete, the multiple pieces of wood By rooting together with cement-containing material so that a gap is generated between the pieces of wood, the roots of the plants extend into the gaps between the pieces of wood and become entangled with the pieces of wood, or the roots of the plants extend to the ground through the gaps. And the vegetation of the said exposed area | region expands to the area | region covered with the said coating layer .

また、本発明に係る木片コンクリートを用いた緑化構造は、前記被覆層で被覆された領域と前記露出領域とが市松状に交互に並ぶように前記被覆層を前記地盤表面に配置したものである。   Further, in the greening structure using wood chip concrete according to the present invention, the covering layer is arranged on the ground surface so that the areas covered with the covering layer and the exposed areas are alternately arranged in a checkered pattern. .

また、本発明に係る木片コンクリートを用いた緑化構造は、前記露出領域が格子状となるように前記被覆層を互いに離間させて前記地盤表面に配置したものである。   In the greening structure using wood chip concrete according to the present invention, the covering layers are spaced apart from each other and arranged on the ground surface so that the exposed regions have a lattice shape.

また、本発明に係る木片コンクリートを用いた緑化構造は、前記露出領域が矩形状にかつ互いに離間配置されるように前記被覆層を前記地盤表面に格子状に連続配置したものである。   The greening structure using wood chip concrete according to the present invention is such that the covering layer is continuously arranged in a grid pattern on the ground surface so that the exposed regions are rectangular and spaced from each other.

また、本発明に係る木片コンクリートを用いた緑化構造は、前記被覆層を、予め硬化させた木片コンクリート板で構成したものである。   Moreover, the tree planting structure using the wood piece concrete according to the present invention is a construction in which the covering layer is made of a wood piece concrete plate hardened in advance.

また、本発明に係る木片コンクリートを用いた緑化構造は、前記被覆層を、未だ硬化していない木片コンクリートを現場施工して硬化させることで構成したものである。   Moreover, the tree planting structure using the wood piece concrete according to the present invention is constructed by applying the wood piece concrete which has not been hardened yet to harden the covering layer.

本発明に係る木片コンクリートを用いた緑化構造においては、緑化の対象となる地盤表面の少なくとも一部が露出領域として露出するように該地盤表面を被覆層で被覆し、該被覆層を、植生基材が積層されない木片コンクリートの単一層で構成するとともに、露出領域のみを植栽の範囲とする。   In the tree planting structure using wood chip concrete according to the present invention, the ground surface is coated with a coating layer so that at least a part of the ground surface to be planted is exposed as an exposed region, and the coating layer is formed by a vegetation base. While it consists of a single layer of wood chip concrete where the material is not laminated, only the exposed area is set as the planting range.

このようにすると、地盤表面のうち、一定の範囲が被覆層で被覆されるため、浸食、剥離、落石といった災害が施工直後から有効に防止されるとともに、かかる防災機能は、露出領域に植え付けられた植物の成長に伴ってさらに向上する。   In this way, since a certain area of the ground surface is covered with the covering layer, disasters such as erosion, peeling, and falling rocks are effectively prevented immediately after construction, and such a disaster prevention function is planted in the exposed area. As the plant grows, it improves further.

そして、所定期間経過後、露出領域で成長した植物の種子が被覆層に飛散しあるいは根が伸張したとき、植物は、木片コンクリートを構成する木片同士の間隙を介してその根を地盤に伸張させ、やがては被覆層で覆われた領域においてもしっかりと植生を拡大し、緑化による防災機能は大幅に向上する。   Then, after a predetermined period of time, when the seeds of the plant grown in the exposed area are scattered in the covering layer or the roots are extended, the plant extends the roots to the ground through the gaps between the pieces of wood constituting the wood piece concrete. Eventually, the vegetation will be expanded even in the area covered with the cover layer, and the disaster prevention function by greening will be greatly improved.

一方、施工当初においては、植栽の範囲が露出領域に限られるとともに、従来のように植生基材を吹き付ける必要もないため、緑化のための初期コストが大幅に軽減される。   On the other hand, at the beginning of construction, the planting range is limited to the exposed region, and it is not necessary to spray a vegetation base material as in the past, so the initial cost for greening is greatly reduced.

加えて、木片コンクリートによる防災機能が施工当初から発揮されるため、従来のように緑化を急ぐ必要がなくなり、その結果、緑化のための植物として成長の早い外来種ではなく、在来種を選択することが可能となり、かくして、刈取りやその処分のための維持管理負担が大幅に軽減されるとともに、かかる作用効果は、植生が被覆層に拡大した段階で緑化によるコスト削減になお一層寄与することとなる。   In addition, since the disaster prevention function by wood chip concrete is demonstrated from the beginning of construction, there is no need to rush greening as in the past, and as a result, select native species rather than fast-growing exotic species as plants for greening Thus, the maintenance burden for cutting and disposal will be greatly reduced, and this effect will further contribute to the cost reduction due to greening when the vegetation has expanded to the cover layer. It becomes.

木片コンクリートを用いた従来の緑化は、緑化対象となる範囲の全面にわたって木片コンクリートを敷設するとともに、さらにその上に植生基材をやはり全面に吹き付ける必要があるため、木片コンクリートの敷設面積も植生基材の吹付け面積も緑化対象となる範囲の全体に及ぶこととなり、初期投資が大きくなる。加えて、緑化のための植物は、植生基材に種子として混入せざるを得ないため、成長が早い外来種の採用を余儀なくされていた。   In conventional tree planting using wood chip concrete, it is necessary to lay wood chip concrete over the entire area to be planted and to spray a vegetation base material on the entire surface. The spraying area of the timber will also cover the entire range to be greened, increasing the initial investment. In addition, since plants for greening must be mixed as seeds in the vegetation base material, it has been unavoidable to adopt exotic species that grow fast.

本発明は、露出領域が残るように木片コンクリートからなる被覆層を地盤に配置するとともに、該露出領域にのみ植栽を施すことにより、木片コンクリートの敷設面積を例えば５０％程度に減らすとともに、植生基材の吹付けを不要にすることが可能となる。また、緑化のための植物は、露出領域に植栽すればよいため、苗木や場合によっては成長した植物を用いることが可能となり、外来種を用いる必要がなくなる。   The present invention arranges a covering layer made of wood piece concrete on the ground so that an exposed region remains, and by planting only the exposed region, the laying area of wood piece concrete is reduced to about 50%, for example, It becomes possible to make the spraying of the base material unnecessary. Moreover, since the plant for greening should just be planted in an exposed area | region, it becomes possible to use a seedling or a grown plant depending on the case, and it becomes unnecessary to use a foreign species.

一方、被覆層を木片コンクリートで構成したことにより、施工当初こそ植生が露出領域に限られるものの、一定期間経過後においては、木片コンクリートからなる被覆層で覆われた被覆領域にまで植生を拡大させることができる。   On the other hand, the vegetation is limited to the exposed area at the beginning of construction because the cover layer is made of wood chip concrete, but after a certain period of time, the vegetation is expanded to the cover area covered with the cover layer made of wood chip concrete. be able to.

本発明において露出領域のみに施す植栽とは、植物を定着させることができる限り、その具体的方法は任意であって、播種からの生育や苗木の植付けが含まれるとともに、場合によっては成長した植物の植付けでもかまわない。   In the present invention, planting to be applied only to the exposed area is optional as long as the plant can be established, including growth from sowing and planting of seedlings, and in some cases grown. Plant planting is also acceptable.

木片コンクリートとは、木片とセメント含有物質との混練物又はその硬化物を意味し、セメント含有物質とは、セメントと水との水和反応による固結作用が得られるものであって、具体的には、セメント及び水からなるセメントミルク（セメントペースト）、セメント、水及び細骨材からなるフレッシュモルタルあるいはセメント、水、細骨材及び粗骨材からなるフレッシュコンクリートの３つの形態が含まれる。   Wood piece concrete means a kneaded product of wood piece and cement-containing substance or a cured product thereof. Cement-containing substance is a substance that can obtain a caking action by hydration reaction between cement and water, and is concretely Includes three forms of cement milk (cement paste) made of cement and water, fresh mortar made of cement, water and fine aggregate, or fresh concrete made of cement, water, fine aggregate and coarse aggregate.

本発明においては、緑化の対象となる地盤表面を全て被覆層で覆うのではなく、少なくとも一部を露出領域として残すことを必須要件とするが、被覆層で覆われた領域（以下、被覆領域）と露出領域との面積割合やその配置形態は任意であり、例えば、被覆領域と露出領域とが市松状に交互に並ぶように被覆層を地盤表面に配置する構成や、露出領域が格子状となるように被覆層を互いに離間させて地盤表面に配置する構成、あるいは露出領域が矩形状にかつ互いに離間配置されるように被覆層を地盤表面に格子状に連続配置する構成を採用することができる。   In the present invention, it is an essential requirement that at least a part of the ground surface to be greened is not covered with the coating layer, but left as an exposed region, but the region covered with the coating layer (hereinafter referred to as the coating region). ) And the exposed area and the arrangement form thereof are arbitrary, for example, a configuration in which the covering layer is arranged on the ground surface so that the covering area and the exposing area are alternately arranged in a checkered pattern, or the exposed area is a lattice shape Adopting a configuration in which the coating layers are arranged on the ground surface so as to be separated from each other, or a configuration in which the coating layers are continuously arranged in a grid pattern on the ground surface so that the exposed regions are arranged in a rectangular shape and separated from each other. Can do.

木片コンクリートは、予め硬化させた木片コンクリート板で構成し、又は未だ硬化していない状態で現場施工してから硬化させて構成することが可能であり、前者の場合には、多数の木片を該木片同士に間隙が生じるようにセメント含有物質で相互に固結させて構成し、後者の場合には、多数の木片とセメント含有物質とを含む混練物を、木片同士の間に間隙が形成された状態で該木片が相互に固結されるように、吹付け等の方法で現場施工すればよい。   The wood piece concrete can be composed of a pre-hardened wood piece concrete plate, or it can be constructed after being applied on-site in an uncured state. In the latter case, a kneaded product containing many pieces of wood and cement-containing material is formed between the pieces of wood. It is only necessary to perform on-site construction by spraying or the like so that the pieces of wood are consolidated in a state where they are in contact with each other.

本実施形態に係る木片コンクリートを用いた緑化構造の図であり、(a)は法面直交方向から見た正面図、(b)はＡ−Ａ線方向に沿った断面図。It is a figure of the tree planting structure using the wood piece concrete which concerns on this embodiment, (a) is the front view seen from the normal plane orthogonal direction, (b) is sectional drawing along the AA line direction. 変形例に係る木片コンクリートを用いた緑化構造の図であり、(a)は法面直交方向から見た正面図、(b)はＢ−Ｂ線方向に沿った断面図。It is the figure of the tree planting structure using the wood piece concrete which concerns on a modification, (a) is the front view seen from the normal plane orthogonal direction, (b) is sectional drawing along the BB line direction. 別の変形例に係る木片コンクリートを用いた緑化構造の図であり、(a)は法面直交方向から見た正面図、(b)はＣ−Ｃ線方向に沿った断面図。It is the figure of the tree planting structure using the wood piece concrete which concerns on another modification, (a) is the front view seen from the normal direction, (b) is sectional drawing along CC line direction.

以下、本発明に係る木片コンクリートを用いた緑化構造の実施の形態について、添付図面を参照して説明する。   Hereinafter, an embodiment of a greening structure using wood chip concrete according to the present invention will be described with reference to the accompanying drawings.

図１は、本実施形態に係る木片コンクリートを用いた緑化構造を示した図である。同図でわかるように、本実施形態に係る木片コンクリートを用いた緑化構造１は、緑化の対象となる地盤２の表面のうち、一部を地盤２の地肌が露出する露出領域５とし、残りの部分を被覆層としての木片コンクリート板３で覆われた被覆領域４としてあるが、木片コンクリート板３は同図でよくわかるように、被覆領域４と露出領域５とが市松状に交互に並ぶように、地盤２の表面に配置してある。   FIG. 1 is a view showing a greening structure using wood chip concrete according to the present embodiment. As can be seen from the figure, in the greening structure 1 using wood chip concrete according to the present embodiment, a part of the surface of the ground 2 to be greened is an exposed area 5 where the ground of the ground 2 is exposed, and the rest Is a covered region 4 covered with a wood concrete plate 3 as a coating layer, but the wood concrete plate 3 has a covered region 4 and an exposed region 5 alternately arranged in a checkered pattern, as can be seen in FIG. Thus, it is arranged on the surface of the ground 2.

木片コンクリート板３は、木片コンクリートの単一層で構成してあるとともに、該木片コンクリート板３自体が被覆層となり、その上には植生基材が積層されない断面構造としてある。   The wood piece concrete board 3 is composed of a single layer of wood piece concrete, and the wood piece concrete board 3 itself becomes a covering layer, and has a cross-sectional structure on which a vegetation base material is not laminated.

一方、植栽を施す範囲は露出領域５のみであり、被覆領域４に対しては、人工的な植栽を施さない。   On the other hand, the area to be planted is only the exposed area 5, and no artificial planting is applied to the covered area 4.

木片コンクリート板３は、多数の木片を該木片同士に間隙が生じるようにセメント含有物質としてのセメントミルクで相互に固結させて構成してあり、かかる構成により、木片同士の間隙に植物の根を伸張させて該木片に絡みつかせ、あるいは間隙を介して地盤２に根を伸張させることで、植物をしっかりと支える定着機能を発揮する。   The wood piece concrete board 3 is constituted by solidifying a large number of wood pieces with cement milk as a cement-containing substance so that gaps are formed between the pieces of wood, and with this construction, the roots of the plant are placed in the gaps between the wood pieces. The roots are entangled with the piece of wood and stretched to the ground 2 through a gap, thereby exhibiting a fixing function for firmly supporting the plant.

木片コンクリート板３は、その厚さを１０ｍｍ以上３０ｍｍ以下、特に２０ｍｍ以上３０ｍｍ以下とするのが望ましい。１０ｍｍ未満では、強度が不足して搬送時や法面に固定する際の釘打ち作業時に破損するおそれがあり、３０ｍｍを越えると、重量が大きくなって作業性が低下するからである。   The wood chip concrete board 3 preferably has a thickness of 10 mm to 30 mm, particularly 20 mm to 30 mm. If the thickness is less than 10 mm, the strength is insufficient, and there is a risk of breakage at the time of carrying or nailing when fixing to a slope, and if it exceeds 30 mm, the weight increases and the workability decreases.

また、木片コンクリート板３は、施工能率を低下させることなく、作業員が持ち運ぶことができるように、その大きさを３００ｍｍ×３００ｍｍ以上、５００ｍｍ×５００ｍｍ以下、特に、４００ｍｍ×４００ｍｍ以上、５００ｍｍ×５００ｍｍ以下とするのが望ましい。   Moreover, the size of the wood chip concrete plate 3 is 300 mm × 300 mm or more, 500 mm × 500 mm or less, particularly 400 mm × 400 mm or more, 500 mm × 500 mm, so that the worker can carry it without reducing the construction efficiency. The following is desirable.

木片コンクリート板３を製造するには、木片とセメントと少量の水とをミキサー内で混合して木片の表面にセメントミルクを絡ませるようにし、かかる状態で板状物製作用型枠内に投入し、適宜プレスをかけながら硬化乾燥させ、板状に成形すればよい。   In order to manufacture the wooden piece concrete board 3, the wooden piece, cement and a small amount of water are mixed in a mixer so that the cement milk is entangled on the surface of the wooden piece, and in this state, it is put into a plate-shaped product working form. Then, it may be cured and dried while being appropriately pressed and formed into a plate shape.

ここで、セメントミルクが多すぎると、製造された木片コンクリート内の間隙が少なくなり、セメントペーストが少なすぎると、木片同士を固結させる強度が不足して板状体としての強度が不足するため、セメント及び水の量は、かかる観点を考慮して適宜決定する。   Here, if there is too much cement milk, there will be less gaps in the manufactured wood piece concrete, and if there is too little cement paste, the strength to solidify the wood pieces will be insufficient and the strength as a plate will be insufficient. The amount of cement and water is appropriately determined in consideration of this viewpoint.

また、木片は、板状体としての強度を確保しつつ、それらの間に間隙が確実に形成されるよう、大きさを１０ｍｍ以上３０ｍｍ以下とするのが望ましい。   Moreover, it is desirable that the wood pieces have a size of 10 mm or more and 30 mm or less so that a gap is reliably formed between them while ensuring the strength as a plate-like body.

木片コンクリート板３をこのような条件で製造すると、質量を１〜３ｋｇ、曲げ破壊荷重を４００Ｎ程度以上、曲げ強さを０．７Ｎ／ｍｍ2程度以上にすることが可能であり、上述したように施工能率と作業性の両方を確保することができる。 When the wood chip concrete board 3 is manufactured under such conditions, it is possible to make the mass 1 to 3 kg, the bending fracture load to about 400 N or more, and the bending strength to about 0.7 N / mm 2 or more. In addition, it is possible to ensure both construction efficiency and workability.

本実施形態に係る木片コンクリートを用いた緑化構造１を構築するには、上述した木片コンクリート板３を施工現場に予め搬入しあるいは現地にて製作した後、該木片コンクリート板を、被覆領域４と露出領域５とが市松状に交互に並ぶように、地盤２の表面に配置する。木片コンクリート板３は、ピンやアンカーなどを用いて地盤２の表面に適宜固定すればよい。   In order to construct the greening structure 1 using wood chip concrete according to the present embodiment, the above-mentioned wood chip concrete plate 3 is pre-loaded into the construction site or manufactured on site, and then the wood chip concrete plate is used as the covering region 4. It arrange | positions on the surface of the ground 2 so that the exposure area | region 5 may be located in a checkered pattern alternately. The wood piece concrete board 3 should just be suitably fixed to the surface of the ground 2 using a pin, an anchor, etc.

次に、木片コンクリート板３で被覆された残りの領域、すなわち露出領域５に植栽６を施す。植栽６は、播種、苗木の植付けなど任意にその方法を選択することができる。   Next, planting 6 is applied to the remaining area covered with the wood chip concrete plate 3, that is, the exposed area 5. The method for planting 6 can be selected arbitrarily such as sowing and planting seedlings.

以上説明したように、本実施形態に係る木片コンクリートを用いた緑化構造１によれば、地盤２の表面のうち、一定の範囲が木片コンクリート板３で被覆されるため、浸食、剥離、落石といった災害が施工直後から有効に防止されるとともに、かかる防災機能は、露出領域５に植え付けられた植物６の成長に伴ってさらに向上する。   As described above, according to the greening structure 1 using wood chip concrete according to the present embodiment, since a certain range of the surface of the ground 2 is covered with the wood chip concrete plate 3, erosion, peeling, rock fall, etc. The disaster is effectively prevented immediately after the construction, and the disaster prevention function is further improved as the plant 6 planted in the exposed region 5 grows.

そして、所定期間経過後、露出領域５に植え付けられた植物６の種子が木片コンクリート板３に飛散しあるいは該木片コンクリート板に根が伸張したとき、植物は、木片コンクリート板３を構成する木片同士の間隙を介してその根を地盤２に伸張させ、やがては被覆領域４においてもしっかりと植生を拡大し、緑化による防災機能は大幅に向上する。   Then, after a predetermined period of time, when the seeds of the plant 6 planted in the exposed area 5 are scattered on the wood piece concrete board 3 or the roots are extended to the wood piece concrete board, the plant is made of wood pieces constituting the wood piece concrete board 3. The roots are extended to the ground 2 through the gaps, and eventually the vegetation is firmly expanded also in the covered region 4, and the disaster prevention function by greening is greatly improved.

一方、施工当初においては、木片コンクリート板３を配置する範囲が被覆領域４に、植栽を行う範囲が露出領域５にそれぞれ限られるとともに、従来のように植生基材を吹き付ける必要もないため、緑化のための初期コストが大幅に軽減される。   On the other hand, at the beginning of construction, the range in which the wood piece concrete board 3 is arranged is limited to the covered region 4, and the range to be planted is limited to the exposed region 5, respectively, and it is not necessary to spray a vegetation base material as in the past, The initial cost for greening is greatly reduced.

加えて、木片コンクリート板３による防災機能が施工当初から発揮されるとともに、苗木や成長した植物を用いて露出領域５に植栽を施すことが可能なため、従来のように緑化を急ぐ必要がなくなり、その結果、緑化のための植物として成長の早い外来種ではなく、在来種を選択することが可能となり、かくして、刈取りやその処分のための維持管理負担が大幅に軽減されるとともに、生態系への影響を懸念する必要もない。なお、かかる作用効果は、植生が木片コンクリート板５に拡大した段階でいっそう顕著となる。   In addition, the disaster prevention function by the wood piece concrete board 3 is demonstrated from the beginning of construction, and since it is possible to plant the exposed area 5 using seedlings and grown plants, it is necessary to rush the greening as before. As a result, it is possible to select native species instead of fast-growing exotic species as plants for greening, thus greatly reducing the maintenance burden for cutting and disposal, There is no need to worry about the impact on the ecosystem. In addition, this effect becomes more remarkable when the vegetation expands to the wood piece concrete board 5.

本実施形態では、予め硬化させてなる木片コンクリート板３で被覆層を構成したが、これに代えて、未だ硬化していない木片コンクリートを現場施工しこれを硬化させることで被覆層を構成するようしてもかまわない。   In the present embodiment, the covering layer is constituted by the wood piece concrete plate 3 that has been hardened in advance, but instead of this, the wood layer concrete that has not yet been hardened is constructed in the field and cured so that the covering layer is constituted. It doesn't matter.

かかる構成においては、まず、地盤２の表面のうち、被覆領域４に型枠を設置するとともに必要に応じてラスを敷設し、しかる後、該ラスの上からセメントミルクと多数の木片とを含む混練物を吹き付けることで、木片コンクリートからなる被覆層を形成する。   In such a configuration, first, a mold is installed in the covering region 4 of the surface of the ground 2 and a lath is laid as necessary, and then cement milk and a large number of pieces of wood are included from above the lath. By spraying the kneaded material, a coating layer made of wood chip concrete is formed.

混練物は、木片とセメント含有物質としてのセメントミルクとを混合して構成してあり、セメントミルクが硬化した状態において、木片同士の間に空隙が形成された状態で該木片が相互に固結されるように、木片及びセメントミルクの混合割合を設定する。   The kneaded product is configured by mixing wood pieces and cement milk as a cement-containing substance. When the cement milk is hardened, the wood pieces are solidified in a state where voids are formed between the wood pieces. Set the mixing ratio of wood chips and cement milk.

具体的には、セメントミルクを木片の量に対して貧配合とし、ミキサー内で木片の周囲にセメントミルクを付着させるように混合し、かかる状態で木片を吹き付けるのが望ましい。   Specifically, it is desirable that cement milk is poorly mixed with the amount of wood pieces, mixed so that the cement milk adheres around the wood pieces in a mixer, and the wood pieces are sprayed in such a state.

かかる混練物を吹き付けるにあたっては、例えば数ｃｍ程度の大きさの木片とセメントミルクとをそれぞれ必要な量だけ計量槽で計量し、これらをミキサーに投入して混合した後、例えばコンクリート吹付機を用いてその吹付けノズルから噴出するようにすればよい。   When spraying such a kneaded product, for example, a piece of wood having a size of about several centimeters and cement milk are weighed in a measuring tank in a necessary amount, and after they are put into a mixer and mixed, for example, using a concrete sprayer It is only necessary to eject from the spray nozzle.

また、本実施形態では、被覆領域４と露出領域５とが市松状に交互に並ぶように、被覆層である木片コンクリート板３を地盤２の表面に配置したが、被覆領域と露出領域とをどのように組み合わせるか、あるいはそれらをどのような平面形状にするかは任意であって、例えば上述した構成に代えて、図２又は図３に示す構成を採用することができる。   Moreover, in this embodiment, although the wood chip concrete board 3 which is a coating layer is arrange | positioned on the surface of the ground 2 so that the covering area | region 4 and the exposure area | region 5 may be located in a checkered pattern alternately, It is arbitrary how they are combined or in which planar shape they are formed. For example, the configuration shown in FIG. 2 or 3 can be adopted instead of the above-described configuration.

図２に示す変形例に係る木片コンクリートを用いた緑化構造２１は上述の実施形態と同様、緑化の対象となる地盤２の表面のうち、一部を地盤２の地肌が露出する露出領域５ｂとし、残りの部分を被覆層としての木片コンクリート板３で覆われた被覆領域４ｂとするとともに、露出領域５ｂを植栽の範囲としてあるが、木片コンクリート板３は同図でよくわかるように、露出領域５ｂが格子状となるよう、木片コンクリート板３を互いに離間させて地盤２の表面に配置してある。   The greening structure 21 using the wood piece concrete according to the modification shown in FIG. 2 is an exposed region 5b where the ground of the ground 2 is exposed in a part of the surface of the ground 2 to be greened as in the above-described embodiment. The remaining portion is the covered area 4b covered with the wood piece concrete board 3 as a covering layer, and the exposed area 5b is the range of planting, but the wood piece concrete board 3 is exposed as can be seen well in the figure. The wood piece concrete plates 3 are arranged on the surface of the ground 2 so as to be spaced apart from each other so that the region 5b has a lattice shape.

かかる構成においても、上述の実施形態と同様の作用効果を奏するとともに、木片コンクリート板３に代えて、未硬化の木片コンクリートを吹き付けて硬化させることができる点についても上述したと同様であるが、ここではその説明を省略する。   Even in such a configuration, while having the same effect as the above-described embodiment, it is the same as described above in that it can be cured by spraying uncured wood piece concrete instead of the wood piece concrete plate 3. The description is omitted here.

図３に示す変形例に係る木片コンクリートを用いた緑化構造３１は上述の実施形態と同様、緑化の対象となる地盤２の表面のうち、一部を地盤２の地肌が露出する露出領域５ｃとし、残りの部分を被覆層としての木片コンクリート３２で覆われた被覆領域４ｃとするとともに、露出領域５ｃを植栽の範囲としてあるが、木片コンクリート３２は同図でよくわかるように、露出領域５ｃが矩形状にかつ互いに離間配置されるよう、地盤２の表面に格子状に連続配置してある。   The greening structure 31 using the piece concrete according to the modification shown in FIG. 3 is an exposed region 5c where the ground of the ground 2 is exposed in a part of the surface of the ground 2 to be greened as in the above embodiment. The remaining portion is the covered region 4c covered with the wood piece concrete 32 as a covering layer, and the exposed region 5c is the range of planting, but the wood piece concrete 32 is exposed region 5c, as can be seen in FIG. Are continuously arranged in a grid pattern on the surface of the ground 2 so that they are rectangular and spaced apart from each other.

木片コンクリート３２は、格子状の型枠を地盤２の表面に建て込んだ後、未硬化の木片コンクリートを型枠内に吹き付けて硬化させるのが望ましい。   It is desirable that the wood piece concrete 32 is hardened by spraying unhardened wood piece concrete into the formwork after the lattice-like formwork is built on the surface of the ground 2.

かかる構成においても、上述の実施形態と同様の作用効果を奏するが、ここではその説明を省略する。   Even in such a configuration, the same effects as those of the above-described embodiment are obtained, but the description thereof is omitted here.

１，２１，３１ 木片コンクリートを用いた緑化構造
２ 地盤
３ 木片コンクリート板（被覆層）
４，４ｂ 被覆領域
５，５ｂ 露出領域
６ 植物
３２ 木片コンクリート（被覆層） 1,21,31 Tree planting structure using wood chip concrete 2 Ground 3 Wood chip concrete board (coating layer)
4,4b Covering area 5,5b Exposed area 6 Plant 32 Wood chip concrete (covering layer)

Claims (6)

緑化の対象となる地盤表面の少なくとも一部が露出領域として露出するように該地盤表面を被覆層で被覆し、該被覆層を、植生基材が積層されない木片コンクリートの単一層で構成するとともに、前記露出領域のみを植栽の範囲としてなり、前記木片コンクリートを、多数の木片を該木片同士に間隙が生じるようにセメント含有物質で相互に固結させることにより、前記木片同士の間隙に植物の根が伸張して該木片に絡みつき又は該間隙を介して植物の根が地盤に伸張し、前記被覆層で被覆された領域に前記露出領域の植生が拡大するようになっていることを特徴とする木片コンクリートを用いた緑化構造。 The ground surface is coated with a coating layer so that at least a part of the ground surface to be greened is exposed as an exposed region, and the coating layer is composed of a single layer of wood chip concrete on which a vegetation base material is not laminated, Only the exposed area is set as a planting area, and the wood piece concrete is solidified with a cement-containing substance so that a plurality of wood pieces are formed with gaps between the wood pieces. The roots extend and entangle with the piece of wood, or the roots of the plant extend to the ground through the gap, and the vegetation of the exposed region is expanded to the region covered with the covering layer. Greening structure using wooden piece concrete. 前記被覆層で被覆された領域と前記露出領域とが市松状に交互に並ぶように前記被覆層を前記地盤表面に配置した請求項１記載の木片コンクリートを用いた緑化構造。 The greening structure using wood chip concrete according to claim 1, wherein the covering layer is arranged on the ground surface so that the areas covered with the covering layer and the exposed areas are alternately arranged in a checkered pattern. 前記露出領域が格子状となるように前記被覆層を互いに離間させて前記地盤表面に配置した請求項１記載の木片コンクリートを用いた緑化構造。 The tree planting structure using wood piece concrete according to claim 1, wherein the covering layers are spaced apart from each other and arranged on the ground surface so that the exposed region has a lattice shape. 前記露出領域が矩形状にかつ互いに離間配置されるように前記被覆層を前記地盤表面に格子状に連続配置した請求項１記載の木片コンクリートを用いた緑化構造。 The tree-planted concrete greening structure according to claim 1, wherein the covering layers are continuously arranged in a lattice pattern on the ground surface so that the exposed regions are rectangular and spaced from each other. 前記被覆層を、予め硬化させた木片コンクリート板で構成した請求項１乃至請求項４のいずれか一記載の木片コンクリートを用いた緑化構造。 The greening structure using wood piece concrete as described in any one of Claim 1 thru | or 4 which comprised the said coating layer with the wood piece concrete board hardened previously. 前記被覆層を、未だ硬化していない木片コンクリートを現場施工して硬化させることで構成した請求項１乃至請求項４のいずれか一記載の木片コンクリートを用いた緑化構造。 The tree planting structure using wood piece concrete as described in any one of Claim 1 thru | or 4 which comprised the said coating layer by carrying out the site construction of the wood piece concrete which has not yet hardened.
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