JP4805725B2 - Earth retaining method by planting bamboo using sandbags - Google Patents

Earth retaining method by planting bamboo using sandbags Download PDF

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JP4805725B2
JP4805725B2 JP2006146154A JP2006146154A JP4805725B2 JP 4805725 B2 JP4805725 B2 JP 4805725B2 JP 2006146154 A JP2006146154 A JP 2006146154A JP 2006146154 A JP2006146154 A JP 2006146154A JP 4805725 B2 JP4805725 B2 JP 4805725B2
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bamboo
soil
sandbags
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earth retaining
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JP2007315058A (en
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忠美 重留
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忠美 重留
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本発明は、例えば火山灰堆積地やダム周辺の斜面の崩壊防止、災害により崩壊した斜面の復旧、河川や池の護岸改修等に好適な、土のう袋を用いた竹の植栽による土留め工法に関する。 The present invention relates to a soil retaining method by planting bamboo using a sandbag, suitable for prevention of collapse of slopes around volcanic ash deposits and dams, restoration of slopes collapsed by disasters, revetment repair of rivers and ponds, etc. .

山林や造成地等の斜面(法面)の崩壊防止と緑化のために木を植える場合、穴を掘って植えるだけでは苗木を安定して保持固定できないことが多く、杭や支柱で苗木を固定しなければならないのが普通で、そうした杭や支柱等の資材の運搬および施工に多大なコストがかかるという問題がある。そこで、蓬莱竹を始めとするバンブー種の竹が、根が横に張らずに下方に強く伸びる特性を有していて、強力な土留めとして機能することが期待でき、しかも、この種の竹は、土に接することで、切り取った竹の節の部分から発根して、容易に活着することから、このような竹の特性を利用して、山林や造成地等の傾斜地の斜面の崩壊防止、災害により崩壊した斜面の復旧、河川や池の護岸改修等の土留めを簡単かつ安価に行えるよう、例えば、切り取った竹を横向けにして一端のみ地表に露出するよう斜めに地中に埋め込んだり、竹しがらを組むことにより土留めを行うことが考えられた(例えば、特許文献1参照。)。
特開2000−154546号公報
When planting trees to prevent the collapse of slopes (slopes) in forests and vegetation, and to plant trees, it is often impossible to stably hold and fix seedlings simply by digging holes, and fixing seedlings with piles or pillars Usually, it has to be done, and there is a problem that transportation and construction of materials such as piles and columns are expensive. So bamboo bamboo and other bamboo-type bamboos have the property that the roots do not stretch horizontally but extend strongly downward, and can be expected to function as a strong earth retaining, and this kind of bamboo Because it is rooted from the cut bamboo section by touching the soil and easily settled, the characteristics of the bamboo can be used to collapse slopes on slopes such as forests and land. Prevention, restoration of slopes that have collapsed due to disasters, and rehabilitation of river and pond revetments, etc. can be done easily and inexpensively, for example, with the cut bamboo facing sideways so that only one end is exposed to the ground diagonally It has been considered to perform earth retaining by embedding or assembling bamboo shoots (see, for example, Patent Document 1).
JP 2000-154546 A

しかしながら、このように切り取った竹を横向けにして地中に埋め込んだり、竹しがらを組むことにより、発根して下方に伸びる竹の根によって土留めを行う方法は、火山灰堆積地のような地質の軟弱な所、特にその斜面や、礫(ガラ土)ばかりのような所には必ずしも適していない。火山灰の斜面では、切り取った竹を横むけ斜めに埋め込んでも、その竹を地中に安定して保持することが容易でないし、竹しがらを組んでも、竹しがら全体が流れることもあって、安定して竹を保持できない場合があり、竹の活着が困難である。また、礫(ガラ土)ばかりの所では発根自体が困難である。   However, the method of retaining earth with bamboo roots that are rooted and extended downward by embedding the bamboos cut in this way sideways and embedding them in the ground or by forming bamboo shoots is like a volcanic ash deposit It is not necessarily suitable for places with soft geological features, especially on the slopes and gravels. On the slopes of volcanic ash, even if the cut bamboo is embedded obliquely across the bamboo, it is not easy to stably hold the bamboo in the ground, and even if bamboo bamboo is built, the bamboo bamboo may flow entirely. In some cases, the bamboo cannot be stably held, and it is difficult to establish the bamboo. In addition, rooting itself is difficult only in gravel.

本発明は、こうした問題を解決するためのもので、竹の植栽による緑化を兼ねた土留めを、地質に関係なく、例えば、火山灰堆積地等の地質の軟弱な所、特にその斜面や、礫(ガラ土)ばかりのような所でも行うことができる、施工簡単で経済的な土留め工法を提供することを目的とする。   The present invention is intended to solve these problems, and retaining soil that also serves as a tree planting by bamboo planting, regardless of the geology, for example, in soft places such as volcanic ash deposits, particularly its slopes, The purpose is to provide a simple and economical earth retaining method that can be carried out only in gravels.

本発明の土留め工法は、土のう袋を用いた竹の植栽による土留め工法であって、施工現場に、防災用の例えば1トン土のう袋を並べ、その土のう袋に現場採取の土又は礫、若しくは土及び礫を詰め、その中に竹を植え込むものであるThe earth retaining method of the present invention is an earth retaining method by planting bamboo using an earthen bag, and, for example, 1 ton earthen bags for disaster prevention are arranged on the construction site, and the soil or gravel collected in the field in the earthen bag. , or filled with soil and gravel, it is intended to implant the bamboo in it.

このように、土のう袋に施工現場の土や礫を入れ、その中に蓬莱竹等の竹を植え込むことで、例えば、火山灰の斜面や、礫(ガラ土)ばかりのような所でも、竹は安定して保持され、容易に活着し、成長する。そして、土や礫の詰まった土のう袋が、土のうとしてそれ自体土留めとして機能するのに加え、成長し袋を破って伸びる竹の根が、強力な土留めとして機能する。そのため、火山灰堆積地やダム周辺の斜面の崩壊防止、災害により崩壊した斜面の復旧、河川や池の護岸改修等のための強力な土留めを行うことができ、例えば、火山灰の斜面や、礫(ガラ土)ばかりのような所でも、緑化を兼ねた土留めを簡単な施工で経済的に行うことができる。   In this way, the soil and gravel at the construction site are put in a sandbag, and bamboo such as bamboo is planted in it, for example, even in places like volcanic ash slopes or gravel (gala soil) It is stably held and easily settles and grows. In addition to the sandbag filled with soil and gravel, it functions as a soil retainer itself, and the bamboo root that grows and breaks through the bag functions as a powerful soil retainer. For this reason, it is possible to prevent the collapse of slopes around volcanic ash deposits and dams, restore slopes that have collapsed due to disasters, rehabilitate rivers and ponds, etc. Even in places like (Gala soil), earth retaining that also serves as a greening can be economically performed with simple construction.

そして、この土留め工法は、特に、土のう袋内の土又は礫、若しくは土及び礫の中に、土のう袋より寸法の小さい客土入りの土のう袋に根の部分を入れて根鉢状に包み込んだ状態の苗竹を植え込むことを特徴とする。And this earth retaining method is to wrap the root part into a soil bag with a smaller size than the soil bag and wrap it in a root pot shape, especially in the soil or gravel in the soil bag or the soil and gravel. It is characterized by planting the seedlings in the state of slag.

このように、客土入り土のう袋で根の部分を包み込んだ状態で植え込むことにより、竹の活着率を一層高めることができる。   Thus, the survival rate of bamboo can be further increased by planting in a state where the root portion is wrapped with the soil bag containing the soil.

この土留め工法において、植栽する竹は、特に、蓬莱竹を始めとするバンブー種の竹が適している。蓬莱竹を始めとするバンブー種の竹は、根が横に張らずに下方に強く伸びる特性を有しているため、強力な土留めとして機能する。   In this earth retaining method, bamboo to be planted is particularly suitable for bamboo seeds such as bamboo. Bamboo bamboo, such as bamboo bamboo, has the property that the roots do not stretch horizontally but extend downward, and thus functions as a strong earth retaining.

このように、本発明の土のう袋を用いた竹の植栽による土留め工法によれば、火山灰堆積地やダム周辺の斜面の崩壊防止、災害により崩壊した斜面の復旧、河川や池の護岸改修等のための強力な土留めを行うことができ、例えば、火山灰の斜面や、礫(ガラ土)ばかりのような所でも、緑化を兼ねた土留めを簡単な施工で経済的に行うことができる。 Thus, according to the earth retaining method by planting bamboo using the sandbag of the present invention, prevention of collapse of slopes around volcanic ash deposits and dams, restoration of slopes collapsed by disasters, revetment repair of rivers and ponds For example, even on places such as volcanic ash slopes and gravel (gala soil), it is possible to economically carry out earth retaining that also functions as greening. it can.

図1は、本発明の土のう袋を用いた植栽による竹の土留め工法の実施形態の一例を示している。この実施形態は、例えば火山灰の湾への流出を防止するためのもので、火山灰の堆積地1に防災用の土のう袋(1トン土のう袋)2を多数並べ(図1では1個だけを示しているが、実際は、1列あるいは複数列で多数の土のう袋2を並べる。)、その土のう袋2に現場採取の火山灰3を詰め、その中に、植栽に適した客土4を入れた小型の土のう袋(客土入りの土のう袋)5に根の部分を入れて根鉢状に包み込んだ状態の蓬莱竹(苗竹)6を植え込む(蓬莱竹以外のバンブー種の竹を植えてもよい)。また、小型の土のう袋5には、適宜、パルプ等の保水材を入れるとよい。 FIG. 1: has shown an example of embodiment of the bamboo earth retaining method by planting using the sandbag of this invention. This embodiment is for preventing, for example, volcanic ash from flowing into the bay, and a large number of sandbags for disaster prevention (one ton of sandbags) 2 are arranged in the volcanic ash deposit 1 (only one is shown in FIG. 1). However, in actuality, a large number of sandbags 2 are arranged in one or more rows.) The volcanic ash 3 collected in the field is packed in the sandbag 2 and the soil 4 suitable for planting is put in it. A small soil bag (a soil bag containing the main soil) 5 is planted with a bamboo shoot (seed bamboo) 6 in a state where the root portion is put in a root pot shape (even if bamboo bamboo other than bamboo is planted) Good). In addition, a water retaining material such as pulp may be appropriately put in the small sandbag 5.

外側となる土のう袋(1トン土のう袋)2は、生分解性の織物生地を使用したもの(サイズ600×600)であるのがよく、内側となる小型の土のう袋(客土入りの土のう袋)5も、また、生分解性の不織布生地を使用したものであるのがよい。   The outer sandbag (1 ton sandbag) 2 should be a biodegradable fabric cloth (size 600x600), and the inner small sandbag (soil bag containing the soil) 5) may also be one using a biodegradable nonwoven fabric.

このように土のう袋(1トン土のう袋)2を用いて蓬莱竹7を植えることにより、軟弱で流れやすい火山灰の中にあっても、蓬莱竹6は安定して保持され、高い活着率で活着し、成長する。また、この実施形態では、客土を入れ、適宜、保水材を入れた小型の土のう袋5で根部分を包み込んだ状態で植えることで、蓬莱竹7の活着率が一層高くなる。 In this way, by planting bamboo bamboo 7 using a soil bag (1 ton clay bag) 2, bamboo bamboo 6 is stably held even in soft and easy-to-flow volcanic ash, and it is alive with a high survival rate. And grow up. Further, in this embodiment, it is putting soil dressing, as appropriate, by planting in a state of wrapped portion of the root in a small sandbag bag 5 containing the water-retaining material, survival rate of Horai bamboo 7 becomes even higher.

そして、火山灰3の詰まった土のう袋が土のうとしてそれ自体土留めとして機能し、また、成長し袋を破って下方へ強く伸びる蓬莱竹6の根が強力な土留めとして機能する。   And the sandbag filled with volcanic ash 3 functions as a soil retaining itself, and the root of the bamboo 6 that grows and breaks the bag and extends strongly downward functions as a powerful soil retaining.

図1は、平地での施工例を示しているが、この実施形態の土留め工法は、火山灰の斜面でも施工することができる。   Although FIG. 1 shows an example of construction on a flat ground, the earth retaining method of this embodiment can also be constructed on a slope of volcanic ash.

こうして、火山灰の堆積地、特にその斜面を植栽により土留めして、火山灰の湾内等への流出を防止することができ、火山灰堆積地の緑化を兼ねた土留めを簡単な施工で経済的に行うことができる。   In this way, it is possible to prevent volcanic ash deposits, especially slopes, from being planted and prevent volcanic ash from flowing into the bay, etc. Can be done.

本発明の土のう袋を用いた竹の植栽による土留め工法は、火山灰以外の土砂、礫(ガラ土)、その他、地質に関わらず実施することができ、火山灰堆積地、ダム周辺の斜面の崩壊防止、災害により崩壊した斜面の復旧、河川や池の護岸改修等、様々な現場で、緑化を兼ねた土留めを簡単な施工で経済的に行うことができる。 The earth retaining method by planting bamboo using the sandbags of the present invention can be carried out regardless of the geology of earth and sand other than volcanic ash, gravel (gara earth), etc. It is possible to economically carry out earth retaining that also functions as greening at various sites, such as prevention of collapse, restoration of slopes that have collapsed due to disasters, and revetment of rivers and ponds.

土のう袋は、1トン土のう袋に限らず、様々な寸法のものを適宜利用することができる。   The sandbag is not limited to a one-ton sandbag, and various sizes can be used as appropriate.

また、土のう袋は、火山灰その他の土砂や礫を詰めたものを、土のうとして複数段に積み重ねてもよく、その場合、最上段の土のう袋に蓬莱竹等を植えるとよい。   In addition, the sandbags may be piled with volcanic ash or other earth and sand or gravel and stacked in multiple stages as sandbags. In that case, it is better to plant bamboo and the like in the top sandbag.

その他、本発明は様々な態様で実施することが可能である。   In addition, the present invention can be implemented in various modes.

本発明の実施形態の一例の説明図である。It is explanatory drawing of an example of embodiment of this invention.

1 火山灰の堆積地
2 土のう袋(1トン土のう袋)
3 火山灰
4 客土
5 小型の土のう袋(客土入りの土のう袋)
6 蓬莱竹(苗竹)
1 Deposit of volcanic ash 2 Soil bag (1 ton bag)
3 Volcanic ash 4 Soil 5 Small soil bag (Soil bag with soil)
6 Bamboo bamboo

Claims (2)

施工現場に土のう袋を並べ、該土のう袋に現場採取の土又は礫、若しくは土及び礫を詰め、その中に、前記土のう袋より寸法の小さい客土入りの土のう袋に根の部分を入れて根鉢状に包み込んだ状態の苗竹を植え込むことを特徴とする、土のう袋を用いた竹の植栽による土留め工法。 Line up the sandbags at the construction site, stuff the soilbags or gravel, or soil and gravel into the sandbags, and put the root portion in the sandbags with the customer soil smaller in size than the sandbags. A soil retaining method by planting bamboo using a sandbag, which is characterized by planting seedlings in a root pot shape . 前記竹が蓬莱竹である、請求項1記載の土のう袋を用いた竹の植栽による土留め工法。 The earth retaining method by planting bamboo using a sandbag according to claim 1, wherein the bamboo is bamboo.
JP2006146154A 2006-05-26 2006-05-26 Earth retaining method by planting bamboo using sandbags Expired - Fee Related JP4805725B2 (en)

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