Method and apparatus for stabilizing a subgrade with additives added through the scarifier
AssigneeFranz Plasser Bahnbaumaschinen-Industriegesellschaft m.b.H.
InventorsErnesto Romani, Livio Abbruzzese, Josef Theurer, Herbert Worgotter, Friedrich Oellerer
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Abstract
An arrangement for installing a protective layer between a subgrade and a layer of ballast of a track bed includes an excavating unit to remove ballast from underneath the track and a subgrade stabilizing unit by which additives are disposed directly over the exposed subgrade and blended underneath the track with the subgrade for formation of a protective layer following a leveling and compacting process. Removed and cleaned ballast is then laid by a conveyor over the new protective layer.
Claims21
A method of stabilizing the subgrade of a track, comprising the steps of:
- continuously removing ballast from underneath the track thereby exposing an upper layer of the subgrade;
- scarifying the upper layer of the exposed subgrade for formation of cracks while
- disposing additives directly over the exposed subgrade and blending the additives with the subgrade underneath the track;
- leveling and compacting the mixture of additives and subgrade for formation of a protective layer;
- and
- laying removed ballast over the protective layer.
An arrangement for installing a protective layer between a subgrade and a layer of ballast of a track bed, comprising:
- a machine frame for movement in an operating direction along a track;
- excavating means mounted on said machine frame for removing ballast from underneath the track to thereby expose an upper layer of the subgrade;
- subgrade stabilizing means trailing said excavating means in operating direction and being arranged underneath the track for directly introducing additives over the subgrade and blending the additives with the subgrade, said stabilizing means including a scarifying means for scarifying the upper layer of the subgrade for formation of cracks while adding said additives and a mixing unit having rotatable mixing elements which are immersible in the subgrade and a first drive for effectuating a vertical adjustment of said mixing unit;
- and
- conveyor means arranged on said machine frame for returning ballast to the track bed at an unloading area.
Dependencies are inferred from the claim text.