2023 Fiscal Year Final Research Report
Research on quality confirmation method immediately after pile construction using electrical resistivity with ICT
Project/Area Number |
20K04782
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 23010:Building structures and materials-related
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Research Institution | Ritsumeikan University |
Principal Investigator |
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Project Period (FY) |
2020-04-01 – 2024-03-31
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Keywords | 土中 / 無線通信 / 同軸ケーブル / 電気比抵抗 / コンクリート強度 / スライム / 砂分率 |
Outline of Final Research Achievements |
The characteristics of wireless communication using underground water as an attenuation medium revealed changes in the maximum underwater communication distance due to differences in device frequency, increases in communication depth due to increased wireless output, increases in propagation attenuation when using coaxial cable, and wireless communication at intervals of 500 mm for wireless data transmission in cement soil underground. Evaluation of compressive strength based on resistivity of root consolidation liquid for buried piles showed the possibility of judging pass/fail from resistivity of unconsolidated root consolidation liquid at the site, based on the relationship between soil resistivity, compressive strength, and effective cement-water ratio. Evaluation of slime on cast-in-place piles revealed the presence of a thin layer of slime mixed with admixture on top of the soil slime layer, and that the sand fraction can be evaluated by electrical resistivity.
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Free Research Field |
建築構造、建築生産
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Academic Significance and Societal Importance of the Research Achievements |
土中の施工環境となる杭施工は、管理者が直接状況を見ることも出来ないため、これまでの管理者の力量や経験により行われてきた部分が多い。その結果、不具合がある場合、建物の不同沈下など上部建物の現象が表れて初めて明らかにされる状況にある。近年開発されるICT技術の活用の一つとして、土中の施工状況データを瞬時に地上に無線伝達させることは、これまでの視えないものを視える化させるモニタリング施工を実現させ、杭の品質確保や施工管理の生産性を、飛躍的に向上させる可能性が大きい。同時に、瞬時に電気信号から入手出来る施工データを多くの評価手法による活用を実現させることは、更なる施工管理の可能性を広げることになる。
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