Method and device for intermittently exerting forces on soil

A method of intermittently exerting thrusting forces on soil through transmission means, comprising the steps of applying a force from at least one mass load on said transmission means when the latter is in contact with said soil, vibrating at least one vibratory member in an equilibrium position out of contact with said transmission means at a first predetermined frequency, and then moving said at least one vibratory member successively out of and, in a shock-like manner, into contacting engagement with said transmission means when the latter is in contact with said soil, with no buffering means opposing the shock-like engagement between said at least one vibratory member and said transmission means, such that the frequency at which said at least one vibratory member is vibrated is reduced to a second lower frequency and shock-like forces are applied to said transmission means by said at least one vibratory member.

A device for intermittently exerting thrusting forces on soil, comprising transmission means for transmitting the forces to the soil and including a base member, a column mounted on said base member, a mass exerting a mass load on said transmission means, at least one vibratory member which is adapted to move up and down and to be brought successively out of and, in a shock-like manner, into engagement with the transmission means, with no buffering means opposing the shock-like engagement between said at least one vibratory member and said transmission means, a column mounted on said base member, said at least one vibratory member including a housing surrounding said column, the latter of which forms a guiding member for said housing, and a plurality of eccentrically rotatable masses accomodated in the housing, and the housing having a lower end adapted to be brought successively out of and, in a shock-like manner, into engagement with the base member, an abutment provided at the upper end of said column and used for take-off of the at least one vibratory member in a downward direction, said abutment including a collar secured to the column, and at least one rubber ring and at least two equiangularly spaced hydraulic rams provided around the column, said at least one ring and said rams forming a connection between the at least one vibratory member and said collar.