Road structure – process – or apparatus – Process – In situ treatment of earth or roadway
Patent
1984-08-09
1987-03-03
Novosad, Stephen J.
Road structure, process, or apparatus
Process
In situ treatment of earth or roadway
404103, 404117, 404130, 74 61, 172 40, E01C 1928
Patent
active
046472479
ABSTRACT:
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.
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"The Influence of Repeated Shear Reversal on the Compaction of Granular Material", P. Ansell and S. F. Brown, Geotechnical Testing Journal.
"A Cyclic Simple Shear Apparatus for Dry Granular Material", P. Ansell and S. F. Brown, Geotechnical Testing Journal, ASTM, vol. 1, No. 2, 1977, pp. 82-92.
Geodynamik H. Thurner AB
Letchford John F.
Ljungman Nils H.
Novosad Stephen J.
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