초록 ▼

The vibrational output of a sonic oscillator is coupled to a compliant member which may comprise a steel stem member. The frequency of the oscillator is adjusted so as to effect resonant standing wave vibration of the compliant member. The resonant vibratory energy is coupled from the compliant memb

The vibrational output of a sonic oscillator is coupled to a compliant member which may comprise a steel stem member. The frequency of the oscillator is adjusted so as to effect resonant standing wave vibration of the compliant member. The resonant vibratory energy is coupled from the compliant member to the pile or other object to be driven by means of a coupler clamp which provides limited bidirectional freedom of motion along the axis of the pile. The coupler clamp further has a guide member which may comprise a partial skirt which controls the angular orientation between the pile and the compliant resonator member. This keeps the sonic energy concentrated along the axis of the pile and prevents significant lateral vibrational modes in the pile. The oscillator resonator member and pile are suspended from an appropriate structure, such as a boom, such that the downward bias weight at the coupler clamp can be controlled. In view of the limited freedom of motion provided in the coupler clamp, i.e., between the resonator member and the pile, and by means of the above-mentioned bias control, the portion of the vibratory energy cycle which is coupled to the pile can be controlled as desired to effect optimum driving of the pile.

대표청구항 ▼

A sonic system for driving an elongated member into earthen material comprising means for generating sonic energy, an elongated compliant resonator member, means for coupling sonic energy from said generating means to said compliant resonator member, the frequency of said sonic energy being such as

A sonic system for driving an elongated member into earthen material comprising means for generating sonic energy, an elongated compliant resonator member, means for coupling sonic energy from said generating means to said compliant resonator member, the frequency of said sonic energy being such as to cause resonant longitudinal standing wave vibration of said resonator member, coupler member means for coupling sonic energy from the resonator member to the elongated member and, means for adjusting the coupling of sonic energy to the elongated member to a preselected fractional portion of the total vibrational cycle of said resonant member, said elongated member being driven non-resonantly along the longitudinal axis thereof during said predetermined fractional portion of the vibrational cycle.