Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
EVALUATION METHOD OF GROUND IMPROVEMENT BODY
To evaluate a quality of a ground improvement body early and without labor and to easily respond to poor construction work.SOLUTION: Before an improvement body K hardens, elastic waves are generated at a vibration excitation position 12 set on the improvement body K or on a ground surface surrounding the improvement body K, the elastic waves are received at a plurality of vibration receiving positions 16A to 16F set at different depths within the improvement body K, and arrival time of the elastic waves from the vibration excitation position 12 to the plurality of vibration receiving positions 16A to 16F is measured. Then, noting that a difference in a speed at which elastic waves propagate occurs between the improved ground K before hardening and an unimproved ground or lumps 40, presence or absence of construction defects is estimated using the measured arrival time. This allows a quality of the improved body K to be evaluated early, immediately after construction, and the quality of the improved body K can be evaluated with less effort compared with strength testing, etc. Since it is before the improved body K hardens, reconstruction to eliminate construction defects is easy.SELECTED DRAWING: Figure 3
【課題】地盤改良体の品質を早期に手間をかけることなく評価すると共に、施工不良への対応を容易に行う。【解決手段】改良体Ｋの硬化前に、改良体Ｋ上或いは改良体Ｋの周囲の地表面に設定した起振位置１２において弾性波を発生させると共に、改良体Ｋ中に設定した互いに深度が異なる複数の受振位置１６Ａ～１６Ｆにおいて弾性波を受け、起振位置１２から複数の受振位置１６Ａ～１６Ｆまでの弾性波の到達時間を計測する。そして、硬化前の改良土Ｋと未改良地盤やダマ４０との間に、弾性波が伝搬する速度差が発生することに着目して、計測した到達時間を利用して施工不良の有無を推定する。これにより、改良体Ｋの品質を施工直後に早期に評価することができ、強度試験などよりも手間をかけずに評価することもでき、改良体Ｋの硬化前であるため施工不良を解消するように容易に再施工を行うことができる。【選択図】図３
EVALUATION METHOD OF GROUND IMPROVEMENT BODY
To evaluate a quality of a ground improvement body early and without labor and to easily respond to poor construction work.SOLUTION: Before an improvement body K hardens, elastic waves are generated at a vibration excitation position 12 set on the improvement body K or on a ground surface surrounding the improvement body K, the elastic waves are received at a plurality of vibration receiving positions 16A to 16F set at different depths within the improvement body K, and arrival time of the elastic waves from the vibration excitation position 12 to the plurality of vibration receiving positions 16A to 16F is measured. Then, noting that a difference in a speed at which elastic waves propagate occurs between the improved ground K before hardening and an unimproved ground or lumps 40, presence or absence of construction defects is estimated using the measured arrival time. This allows a quality of the improved body K to be evaluated early, immediately after construction, and the quality of the improved body K can be evaluated with less effort compared with strength testing, etc. Since it is before the improved body K hardens, reconstruction to eliminate construction defects is easy.SELECTED DRAWING: Figure 3
【課題】地盤改良体の品質を早期に手間をかけることなく評価すると共に、施工不良への対応を容易に行う。【解決手段】改良体Ｋの硬化前に、改良体Ｋ上或いは改良体Ｋの周囲の地表面に設定した起振位置１２において弾性波を発生させると共に、改良体Ｋ中に設定した互いに深度が異なる複数の受振位置１６Ａ～１６Ｆにおいて弾性波を受け、起振位置１２から複数の受振位置１６Ａ～１６Ｆまでの弾性波の到達時間を計測する。そして、硬化前の改良土Ｋと未改良地盤やダマ４０との間に、弾性波が伝搬する速度差が発生することに着目して、計測した到達時間を利用して施工不良の有無を推定する。これにより、改良体Ｋの品質を施工直後に早期に評価することができ、強度試験などよりも手間をかけずに評価することもでき、改良体Ｋの硬化前であるため施工不良を解消するように容易に再施工を行うことができる。【選択図】図３
EVALUATION METHOD OF GROUND IMPROVEMENT BODY
地盤改良体の評価方法
KANEKO HIROAKI (Autor:in) / KYODA YUJI (Autor:in)
03.10.2024
Patent
Elektronische Ressource
Japanisch
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