<紀要論文>
竹繊維を利用した法面緑化基盤材の耐侵食性

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概要 法面は,侵食や風化に対し脆弱であるため,法面保護の目的で法面緑化工の一つである植生基材吹付工は広く普及している.これは,法面侵食を抑制するために基盤材をラス金網を張った法面に吹付けるものである.しかし,法面は植物が繁茂する前にしばしば侵食の被害を受けてきた.このような法面侵食を軽減するために法面の基盤素材として竹繊維を利用する植生基材吹付工法が開発された.本吹付工は既にいくつかの現場で施工され,侵...食が起こりにくいことがわかっている.本報告では,竹繊維吹付工がバークを使った従来吹付工に比べ侵食を受けにくいことを定量的に実証するために,小型容器に詰めた基盤材を模擬法面として屋外での侵食試験を行った.その結果,侵食量は,ラス金網の有無にかかわらずバークより竹繊維の方が少なく,ラス金網の設置により竹繊維とバークの侵食量はいずれも増加すること,ラス金網を設置しない竹繊維が最小の侵食量を示すことがわかった.また,侵食の抑制という点から考えると,竹繊維吹付工ではラス金網は設置すべきでないこと,接合剤を添加すべきでないという結論を得た.
Slope greening techniques are being used to reinforce cutting and embankment slopes, and spraying substrate onto slope surface has been widely practiced to protect slopes from water erosion. The mixture of bark and peat moss is commonly used as a substrate, and the substrate to which adhesive was added is sprayed onto the slope surface on which steel wire mesh is placed. Though the spraying of the substrate is aimed at preventing erosion of substrate layers, they were frequently damaged by severe erosion before vegetation grows in the substrate. To reduce the damage of substrate layers by erosion, bamboo fiber was newly produced through the mechanical crushing of raw bamboo and was applied to the substrate of slopes at several construction sites, and as a result the erosion of substrate layer was minimized at most of the sites. In the present study erosion tests were conducted using box-type miniature slopes to assess resistance to erosion of the substrates including the bamboo fiber and bark, and also the effects of steel wire mesh placement and adhesive addition on erosion. The bamboo fiber was far more effective than the bark for preventing erosion in case steel wire mesh was not placed; the amount of erosion for the bamboo fiber was only 5 % of that for the bark. By installing steel wire mesh the amount of erosion increased 20- and 3-fold for the bamboo fiber and bark, respectively. Addition of adhesive to the bark enhanced the amount of erosion 3-fold. The permeability of the bamboo fiber was three times as high as that of the bark. The greater resistance to erosion for the bamboo fiber than for the bark was ascribed to the bamboo fiber's characteristics such as entangled association, and lesser fine fraction percentage, higher permeability, and greater tensile strength than the bark.
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目次 諸言 植生基材吹付工について 竹利用の背景と材料 基盤材の透水性 基盤材の耐侵食性 現場における基盤材の劣化 まとめ 要約

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登録日 2014.09.22
更新日 2021.03.03

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