초록 ▼

Method and apparatus for compacting a layer of material using a compacting machine having at least one drum which is rolled over the layer; the material layer is acted on by gravitational force of the roller and an oscillating force. The latter is the result of applying a rapidly substantially alter

Method and apparatus for compacting a layer of material using a compacting machine having at least one drum which is rolled over the layer; the material layer is acted on by gravitational force of the roller and an oscillating force. The latter is the result of applying a rapidly substantially alternating torque to the drum about its axis. The direction of action of the torque is reversed with a high frequency in relation to the frequency with which the direction of travel of the compacting unit is reversed. The invention also embraces means for executing the method wherein the torque on the drum is provided by at least two synchronously operating, rotating eccentric means spaced from the shaft of the drum, and which are adapted such that the forces caused by their synchronous movement can substantially neutralize each other radially to the drum and co-act to form a pure torque on the drum about its shaft.

대표청구항 ▼

A method of compacting a layer of material with a compacting machine, said compacting machine including a drum having a rotational axis for rotation of the drum thereabout, said method comprising the steps of: motorizedly moving said drum upon said layer of material to be compacted and thereby apply

A method of compacting a layer of material with a compacting machine, said compacting machine including a drum having a rotational axis for rotation of the drum thereabout, said method comprising the steps of: motorizedly moving said drum upon said layer of material to be compacted and thereby applying generally downward forces to the layer during movement of the drum upon the layer; motorizedly changing the direction of movement of the drum, said motorized changes of said direction of movement of said drum having at least a first frequency component; generating a torque and applying said torque to the drum about said rotational axis thereby generating shear stress components in the layer substantially parallel to the direction of movement of the drum upon the layer of material during the movement of the drum; repeatedly and rapidly changing the direction of the torque at a second frequency, which is higher than the at least first frequency component, by rapidly and repeatedly reversing the direction of the action of the applied torque to said drum between a substantially clockwise and a substantially counterclockwise direction around the drum axis neutralizing essentially all radial alternating forces applied to the drum with said torque except in said direction of movement; and transmitting the alternating force in said direction of movement of said drum into said layer of material substantially along said direction of movement of said drum, whereby said alternating torque generating alternating shear stress components in said layer of material to be compacted are substantially parallel to said direction of movement of said drum. A compacting machine using at least one roller drum rotatable about a rotational axis which at least one roller drum can be moved back and forth in a direction with at least one known frequency component in a direction on a surface of a material to be compacted for compacting and densifying said material, said machine being of the type which induces oscillation of said at least one roller drum for aiding machine gravity in material compaction, the compacting machine comprising; a torque producing means for applying to said at least one roller drum about its rotational axis a substantially pulsating type alternating torque for generating, in use, in said material to be compacted alternating shear components directed substantially parallel to said direction of movement of said at least one roller drum; means for reversing the torque direction between a clockwise direction and a counterclockwise direction at a second frequency which is higher compared to the known frequency component of back and forth movement of said at least one roller drum; and means for essentially neutralizing a sum of all components of alternating radial forces applicable to at least a portion of said at least one roller drum except in said direction of movement of said at least one roller drum, whereby the alternating force along said direction of movement of said at least one roller drum is transmitted, during use, from said at least one roller drum into said material to be compacted substantially along said direction of movement of said at least one roller drum.