Road structure – process – or apparatus – Apparatus – Material distribution means
Patent
1990-09-05
1992-11-24
Britts, Ramon S.
Road structure, process, or apparatus
Apparatus
Material distribution means
E01C 1938
Patent
active
051658208
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a compaction plank for a road finishing machine, for installation and compaction of freshly laid road surface material, which preferably can be adjusted in its working width, and for this purpose preferably demonstrates a main plank and adjustable planks which can be extended laterally, and which has a base plate which acts in the plane of the road surface material, to which one or more, preferably strip-shaped, powerdriven rammers are assigned.
Road finishing machines with compaction planks of the type stated are commercially available. The base plate compresses the freshly laid road surface material. It is supported in this by the rammer(s). Often, there are two rammers, mostly in the shape of strips or blades, so that they exert a greater area pressure on the road surface material than the base plate. The aim is to achieve the best possible compaction of the laid road surface material, so that subsequent collapse or sinking of the road surface material when traffic drives over it is prevented, if possible. A high level of compaction is also supposed to be achieved with conventional compaction planks with the combination of rammers and base plate. However, when using rammers and a base plate, the problem can occur that the base place with vibration drive and the rammer(s) with oscillation drive counteract one another instead of supporting one another, i.e. what can happen is that the road surface material which was compacted by the base plate is loosened again by the rammers, instead of being further compacted, or vice versa.
In order to achieve the best possible compaction of the road surface material, it is therefore very important to coordinate the work methods of the base plate and the rammer(s), and not only to coordinate the rammers with the base plate, but also the rammers with each other. For example, what can happen if this is not done is that with a combined use of two rammers arranged next to one another, a type of suction effect can occur instead of a compaction effect, and that in this way, the fine and liquid components of the road surface material, in particular, are suctioned up instead of being compacted. It is also possible that the road surface material which has already been compacted is shaken loose again.
The invention is based on the task of improving a compaction plank for a road finishing machine, of the type stated initially, in such a way that better compaction of the road surface material is achieved.
This task has been accomplished, according to the invention, in that at least two rammers are provided, one of which is arranged in front of the base plate in the direction of travel of the road finishing machine, as a preparatory rammer, and the other of which is arranged in the middle of the base plate, as a post-compaction rammer.
With this arrangement of the rammers and the base plate, the rammers and the segments of the base plate, especially the front base plate segment, work together more effectively, without one of these elements cancelling out the compaction work of another of these elements.
Even better compaction is achieved if the rammers are driven in opposite cycles, as provided by a further development of the invention.
The expenditure and design effort for construction of the compaction plank according to the invention are kept relatively low if the rammers are coupled together in terms of drive, since a second drive is not necessary then, and coordination of the two rammers is possible in simple manner, by designing them accordingly.
Preferably, the rammers are connected with one another via a two-arm lever, with each of the rammers being connected with one of the two lever arms, and the lever being driven to pivot around its fulcrum.
In a preferred embodiment of the compaction plank according to the invention, the rammers exert different ramming forces. This is preferably accomplished by the fact that the lever arms of the lever which attach to the rammers are of different lengths, with the lever arm of the lever which attaches to the po
REFERENCES:
patent: 1644511 (1927-10-01), Carr
patent: 3252390 (1966-05-01), Martinson
patent: 3504598 (1970-04-01), Haker
patent: 3508475 (1970-04-01), Smith
patent: 3541932 (1970-11-01), Hodson
patent: 3856425 (1974-12-01), Miller et al.
patent: 4828428 (1989-05-01), Anderson
Bunk Klaus-Dieter
Fricke Anton
Kurtz Manfred
Matten Ernst
Britts Ramon S.
Connolly Nancy P.
Dynapac GmbH
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