Method and device for producing a surface coating on a surface such as a road
DCFirst Claim
1. A method for producing a surface coating on a surface, comprising the steps of:
- spreading a layer of bituminous liquid binding material on the surface;
spreading a layer of aggregates, comprising loose chips covered with a pasty mixture of bitumen and pulverulent material, over said layer of bituminous liquid binding material;
compacting said layer of aggregates against said layer of bituminous liquid binding material;
wherein said steps of spreading said layer of binding material, spreading said layer of aggregates and compacting said layer of aggregates are performed successively along a particular direction of advance within a period of five seconds or less for any given portion of said surface coating; and
wherein said layer of binding material contains at least 11 percent and no more than 89 percent by weight of the total quantity of bitumen present in said surface coating.
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Abstract
The method comprises spreading a layer of bituminous binding material on the surface, spreading at least one layer of aggregates on the layer of binding material, and compacting the layer of aggregates in contact with the layer of binding material. The aggregates consist of loose chips covered with a mixture, which has a pasty consistency, of bitumen and of pulverulent material. The layer of binding material contains at least 11% of the total quantity of bitumen used in the coating. The operations of spreading the binding material and the aggregates and of compacting and surfacing the coating are performed in succession within a period of less than 5 seconds, the speed of advance of the site being at least ten meters per minute. An integral mobile device carrying a bitumen-spraying boom and a finishing table fixed to the rear part of the chassis makes it possible to produce a coating according to the invention using aggregates which are coated with bitumen produced by the device or transported thereby to the rear part of the chassis between the spraying boom and the finishing table.
44 Citations
17 Claims
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1. A method for producing a surface coating on a surface, comprising the steps of:
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spreading a layer of bituminous liquid binding material on the surface; spreading a layer of aggregates, comprising loose chips covered with a pasty mixture of bitumen and pulverulent material, over said layer of bituminous liquid binding material; compacting said layer of aggregates against said layer of bituminous liquid binding material; wherein said steps of spreading said layer of binding material, spreading said layer of aggregates and compacting said layer of aggregates are performed successively along a particular direction of advance within a period of five seconds or less for any given portion of said surface coating; and wherein said layer of binding material contains at least 11 percent and no more than 89 percent by weight of the total quantity of bitumen present in said surface coating. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for producing a surface coating, formed of aggregates and bitumen, on a surface, comprising:
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a chassis having a forward end and a rearward end; a plurality of rolling means spaced longitudinally along said chassis for supporting said chassis such that it can roll along a particular direction of advance; means for moving said chassis along said direction of advance; a receiving hopper mounted on said chassis near said forward end thereof for receiving chips; a storage hopper mounted on said chassis at a central part thereof for storing the chips; elevator means for conveying the chips upwardly from said receiving hopper and into said storage hopper; conveyer means for conveying the chips rearwardly from said storage hopper; at least one reservoir mounted on said chassis for containing liquid bituminous binding material; spraying means, mounted rearwardly of the rearwardmost of said rolling means, for spraying the liquid bituminous binding material from said at least one reservoir onto the surface as said chassis is being moved forwardly in said direction of advance; discharge means, disposed rearwardly of said spraying means, for discharging the chips from said conveyer means onto the surface after it has been coated with the liquid bituminous binding material by said spraying means, as said chassis is being moved forwardly in said direction of advance; and a finishing table, suspended in an articulated manner from said chassis at a location rearward of said spraying means, for compacting the chips discharged onto the surface against the binding material sprayed onto the surface as said chassis is being moved forwardly in said direction of advance. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification