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A platform for research: civil engineering, architecture and urbanism
GROUNDING DETERMINATION SYSTEM AND GROUNDING DETERMINATION METHOD
To provide a grounding determination system and a grounding determination method capable of surely determining a grounding layer in which a casing pipe needs to be grounded.SOLUTION: A grounding determination system determines that a casing pipe which is penetrated into a soft layer on the sea bottom by vibration of a vibration hammer is grounded in a grounding layer which is a supporting ground of a lower layer of the soft layer.The grounding determination system includes: a sensor mounted on a column for supporting the vibration hammer, and for detecting the vibration transmitted from the vibration hammer; and a determination part for repeatedly calculating a frequency characteristic of the vibration detected by the sensor during the penetration of the casing pipe into the sea bottom, and for, in the case where it is detected that the calculated frequency characteristic includes a second peak frequency higher than an intrinsic peak frequency, in addition to a first peak frequency intrinsic to the vibration hammer, determining that the tip of the casing pipe has arrived at the grounding layer.SELECTED DRAWING: Figure 3
【課題】ケーシングパイプを着底させたい着底層を確実に判定できる着底判定システムおよび着底判定方法を提供する。【解決手段】着底判定システムは、バイブロハンマの振動により海底の軟弱層に貫入されるケーシングパイプが、軟弱層の下層の支持地盤である着底層に着底したことを判定する着底判定システムであって、バイブロハンマを支持する支柱に取り付けられ、バイブロハンマから伝達される振動を検出するセンサと、ケーシングパイプの海底への貫入中にセンサにより検出される振動の周波数特性を繰り返し算出し、算出した周波数特性がバイブロハンマの固有の第１のピーク周波数に加えて、固有のピーク周波数より高い第２のピーク周波数を含むことを検出した場合、ケーシングパイプの先端の着底層への到達を判定する判定部とを有することを特徴とする。【選択図】図３
GROUNDING DETERMINATION SYSTEM AND GROUNDING DETERMINATION METHOD
To provide a grounding determination system and a grounding determination method capable of surely determining a grounding layer in which a casing pipe needs to be grounded.SOLUTION: A grounding determination system determines that a casing pipe which is penetrated into a soft layer on the sea bottom by vibration of a vibration hammer is grounded in a grounding layer which is a supporting ground of a lower layer of the soft layer.The grounding determination system includes: a sensor mounted on a column for supporting the vibration hammer, and for detecting the vibration transmitted from the vibration hammer; and a determination part for repeatedly calculating a frequency characteristic of the vibration detected by the sensor during the penetration of the casing pipe into the sea bottom, and for, in the case where it is detected that the calculated frequency characteristic includes a second peak frequency higher than an intrinsic peak frequency, in addition to a first peak frequency intrinsic to the vibration hammer, determining that the tip of the casing pipe has arrived at the grounding layer.SELECTED DRAWING: Figure 3
【課題】ケーシングパイプを着底させたい着底層を確実に判定できる着底判定システムおよび着底判定方法を提供する。【解決手段】着底判定システムは、バイブロハンマの振動により海底の軟弱層に貫入されるケーシングパイプが、軟弱層の下層の支持地盤である着底層に着底したことを判定する着底判定システムであって、バイブロハンマを支持する支柱に取り付けられ、バイブロハンマから伝達される振動を検出するセンサと、ケーシングパイプの海底への貫入中にセンサにより検出される振動の周波数特性を繰り返し算出し、算出した周波数特性がバイブロハンマの固有の第１のピーク周波数に加えて、固有のピーク周波数より高い第２のピーク周波数を含むことを検出した場合、ケーシングパイプの先端の着底層への到達を判定する判定部とを有することを特徴とする。【選択図】図３
GROUNDING DETERMINATION SYSTEM AND GROUNDING DETERMINATION METHOD
着底判定システムおよび着底判定方法
MIZUNO KENTA (author) / ARIKI TAKAAKI (author)
2023-07-19
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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