論文・報告
| No. | タイトル・執筆者 |
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| 4 | |
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近年、既存杭を撤去した後に新設の杭を施工する事例が増加している。既存杭撤去後の杭孔の埋戻し方法には確立された工法がないのが現状であるため、今回、既存杭を撤去し埋戻した現場での調査および室内配合試験を実施した。現地調査の結果、埋戻しの攪拌工法や施工法によらず、目標強度に達しない部分や、強度のバラツキが大きいケースがあった。室内試験では、電気比抵抗による地盤改良の品質管理手法が埋戻し箇所にも適用できる可能性があることを確認した。 キーワード: 埋戻し、既存杭撤去、現地調査、改良土、電気比抵抗 |
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There are increasing cases of removing existing piles before constructing new piles, in recent years. There is no established method for backfilling holes after removing existing piles. Therefore, site investigations where existing piles were removed and backfilled, and laboratory tests using field samples were conducted. As a result of the site investigations, it was confirmed that the strength at some part was less than the target one and that the variation of strength was large, regardless of the agitation method and construction method for backfilling. Laboratory tests showed that there is a possibility that the quality control method of ground improvement by electrical resistivity can be applied to the backfilling. Key Words: backfilling, removal of existing p ile, s ite investigation, improved soil, electrical resistivity |
概要