Covestro Deutschland Ag

Bayer Materialscience Ag

Torsten Erwe

Thomas Kleiner

Thomas Gross

Knud Werner

Andreas Hoffmann

Ole Brettschneider

Hans-Guido Wirtz

Udo Maier

Dirk Weiβenberg

Ralf Busch

Frank Grimberg

Dirk Weissenberg

A method is provided for foaming a ballast bed of a railway track wherein the railway track comprises sleepers positioned on the ballast bed and rails positioned on the sleepers, wherein the rails are covered at least in a partial area along a region of the ballast bed to be foamed, and a foaming agent is introduced into the ballast bed while the rails are covered, wherein the ballast bed has in a sleeper bay defined by two successive sleepers an upper side facing against the gravitational direction, and the ballast bed is heaped up so that the upper side of the ballast bed reaches at least up to an underneath side of the sleeper facing in the gravitational direction.

Method for covering a ballast bed with foam in a railway track system

The invention relates to a method for producing load transferring regions in a ballast body of a track superstructure by introducing curable liquid plastics or reactive plastic mixtures from a mixing unit by means of at least two distributor pipes with outlets into the load transferring regions and allowing the plastic or the reactive plastic mixture to cure in said load transferring regions. The two distributor pipes with outlets are positioned on the left or on the right from the outside of the rails into the region between the two rails such that the outlets are located adjacent to each other and are laterally spaced from the front face () of the tie () that has the load transferring region to be reinforced. The two outlets are opened in order to allow the plastic or the reactive plastic mixture to exit at a controlled rate. Each distributor pipe outlet is guided to the respective end face (') of the tie () from the inside to the outside in a lateral manner with respect to the front face () of the tie () and around the respective end face (&#x2032;) of the tie () to the rear face () of the tie (). The distributor pipe outlets are guided in a lateral manner along the rear face () of the tie () into the region between the two rails (&#x2032;) such that the outlets are located adjacent to each other and are laterally spaced from the rear face () of the tie ().

Method for producing ballast bodies

A process for the production of ballast for railway track laying, road construction, dam construction and bank protection, wherein ballast stones are spread out to form ballast and a reaction mixture for the preparation of a polyurethane foam, produced from components by a low-pressure process, is applied between the spread ballast stones.

Process for the production of ballast

Processes comprising: providing an anion exchanger at least partially loaded with hexachlorostannate; and contacting the at least partially loaded anion exchanger with a 1 to 10 wt. % hydrochloric acid solution to regenerate the anion exchanger.

Processes for the regeneration of an anion exchanger loaded with hexachlorostannate

Process for providing a purified gas stream, comprising: providing a crude gas stream comprising an organic impurity; condensing at least a portion of the impurity from the gas stream to form a prepurified gas stream; and subjecting the prepurified stream to adsorption on a first adsorption medium; wherein the first medium is subjected to a regeneration comprising: providing a circulating inert gas stream having a temperature of at least 100&#xb0; C.; passing the circulating inert gas stream over the first medium to form an organic impurity-loaded inert gas stream; cooling the loaded stream; condensing at least a portion of the organic impurity from the cooled stream to provide a prepurified circulating inert gas stream; subjecting the prepurified gas stream to adsorption on a second adsorption medium to provide a purified circulating inert gas stream; and recycling the purified gas stream to the circulating inert gas stream.

Growing community of inventors

Odenthal, Germany

Torsten Erwe