Mobile planing machine and planing method for roadways with reduction in dust by a mobile planing machine

Abstract

Disclosed is a method for planing roadways by a mobile planing machine producing planings and dust, in which a rotary planing-milling tool is employed, arranged in a housing of the planing machine, the tool receiving water for cooling thereof. The method has reduced dust, in particular asbestos fibre dust, an additive being added to the water in order to form an aqueous composition for agglomerating the dust with the planings produced in order to form aggregates, the rotation of the tool causing a mixing of the planings, the dust and the water with additive, the aqueous composition being selected alone or in a chemically compatible combination with: a bitumen emulsion, a bitumen foam, an aqueous solution including mineral and/or organic fillers. The application also relates to a mobile planing machine.

1 - 15 . (canceled) 
     
     
         16 . A method of pavement planing by a mobile planer producing millings and dusts, in which a rotary planing-milling tool housed in a casing of the planer is implemented, the tool receiving water to allow the cooling down thereof, wherein, to perform an abatement of the dusts, it is further introduced into the casing at least one additive with the water forming or to form therein an aqueous composition intended to agglomerate the dusts with the millings produced to form bonded aggregates. 
     
     
         17 . The method according to  claim 16 , wherein the water and the additive(s) are introduced into the casing in such a manner that the rotation of the tool causes a mixing of the millings, the dust and the aqueous composition. 
     
     
         18 . The method according to  claim 17 , wherein the dusts contain asbestos fibers and/or silica. 
     
     
         19 . The method according to  claim 17 , wherein the aqueous composition is chosen alone or in a physically/chemically compatible combination among: a bitumen emulsion, a bitumen foam, an aqueous solution with mineral and/or organic fillers. 
     
     
         20 . The method according to  claim 19 , wherein at least two of the aqueous compositions chosen among: a bitumen emulsion, a bitumen foam, an aqueous solution with mineral and/or organic fillers are introduced into the casing, at different places of the casing for each one. 
     
     
         21 . The method according to  claim 20 , wherein aqueous solution with mineral and/or organic fillers is introduced at the planing-milling tool and on the planer casing in order to cool them down. 
     
     
         22 . The method according to  claim 19 , wherein the aqueous composition includes a bitumen emulsion, its temperature being of about 60° centigrade. 
     
     
         23 . The method according to  claim 19 , wherein the aqueous composition includes a hot bitumen foam, its maximum temperature being of about 160° centigrade and its minimum temperature being of about 100° centigrade. 
     
     
         24 . The method according to  claim 19 , wherein each additivated water forming the aqueous composition is stored in a tank of the planer, said aqueous composition being stored ready-made. 
     
     
         25 . The method according to  claim 19 , wherein both water, as well as the additive(s), are stored separately in tanks of the planer, said additives being in concentrated form, the aqueous composition being made on demand in the planer. 
     
     
         26 . The method according to  claim 24 , wherein the or at least one of the tanks of the planer is a buffer tank and wherein said buffer tank is connected by a supply line to an external transportation tank truck that follows or precedes the planer during its displacement. 
     
     
         27 . The method according to  claim 25 , wherein the or at least one of the tanks of the planer is a buffer tank and wherein said buffer tank is connected by a supply line to an external transportation tank truck that follows or precedes the planer during its displacement. 
     
     
         28 . The method according to  claim 17 , wherein a component is further implemented for the recovery and the evacuation out of the casing of the aggregates produced, said component including an inclined, endless conveyor belt conveying said aggregates from an upstream end, on the side of the planer casing, to a downstream end, on the side of a storing component into which said produced aggregates flow down. 
     
     
         29 . The method according to  claim 28 , wherein a flow down chute for the aggregates is placed at the downstream exit of the conveyor belt component. 
     
     
         30 . A mobile planer for pavement planing and including a rotary planing-milling tool arranged in a casing, the planing producing millings, and means for introducing cooling water on the tool, comprising dust abatement means, including means for introducing into the casing at least one additive with water forming, or to form therein, an aqueous composition intended to agglomerate the dusts with the millings, to form bonded aggregates. 
     
     
         31 . The planer according to  claim 30 , wherein the aqueous composition is chosen alone or in a physically/chemically compatible composition among: a bitumen emulsion, a bitumen foam, an aqueous solution with mineral and/or organic fillers.