Method of measuring mechanical data of a soil, and of compacting the soil, and measuring or soil-compaction device
AssigneeAmmann Verdichtung AG
InventorsRoland Anderegg, Hans-Ulrich Leibundgut
Life of this patent
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Abstract
Method and apparatus for compacting soil and for determining a mechanical characteristic of soil, including a method and apparatus for periodically compacting soil with a soil compacting device so as to make the soil and the soil compacting device vibrate together as a single oscillatory system, analyzing the vibration of the soil and soil compacting device, and adjusting an oscillatory driving force so as to drive the single oscillatory system towards a characteristic resonance frequency Ω.
Claims12
A method for measuring a mechanical characteristic of a soil using a soil compacting device and an arithmetic unit, comprising:
- periodically compacting the soil using the soil compacting device so as to make the soil compacting device and the soil vibrate;
- using the arithmetic unit to analyze the vibration of the soil compacting device and the soil together as a single oscillatory system having a characteristic resonant frequency Ω;
- and
- dynamically adjusting the compacting of the soil so that the single oscillatory system resonates or oscillates at a frequency exceeding the characteristic resonance frequency Ωn by a preset frequency;
- wherein dynamically adjusting the compacting of the soil comprises using the arithmetic unit to automatically adjust an oscillation exciting force for driving the soil compacting device, a period frequency of the oscillation exciting force, and a phase angle (ø) between oscillation of the soil compacting device and vibration of the single oscillatory system;
- so that, in view of a mass (md) of the soil compacting device and a static weight load (mf) of the soil compacting device, a desired soil rigidity (CB) is achieved.
A measuring apparatus for measuring a mechanical characteristic of a soil, comprising:
- at least one soil compacting device in contact with the soil at least some of the time, the at least one soil compacting device including at least one oscillating mass which generates a periodic force on the at least one soil compacting device, the vibration frequency (Ω) of the at least one oscillating mass being adjustable with a drive;
- a measuring element which determines a point in time of a maximum oscillation amplitude (a0) of the soil compacting device;
- a sensor for identifying a point in time of a maximum oscillation amplitude of the oscillating mass and
- an arithmetic unit to analyze the vibration of the soil compacting device and the soil together as a single oscillatory system having a characteristic resonant frequency (Ω), said arithmetic unit dynamically adjusting the compacting of the soil so that the single oscillatory system resonates or oscillates at a frequency exceeding the characteristic resonance frequency (Ω) by a preset frequency,
- wherein dynamically adjusting the compacting of the soil comprises using the arithmetic unit to automatically adjust an oscillation exciting force for driving the soil compacting device, a period frequency of the oscillation exciting force, and a phase angle (ø) between oscillation of the soil compacting device and vibration of the single oscillatory system.
Dependencies are inferred from the claim text.