EP0283399A1 - Apparatus and process for producing and spraying bituminous foam, use in surface dressing - Google Patents

Apparatus and process for producing and spraying bituminous foam, use in surface dressing Download PDF

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Publication number
EP0283399A1
EP0283399A1 EP88400614A EP88400614A EP0283399A1 EP 0283399 A1 EP0283399 A1 EP 0283399A1 EP 88400614 A EP88400614 A EP 88400614A EP 88400614 A EP88400614 A EP 88400614A EP 0283399 A1 EP0283399 A1 EP 0283399A1
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EP
European Patent Office
Prior art keywords
bitumen
spreading
producing
grid
enclosure
Prior art date
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Granted
Application number
EP88400614A
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German (de)
French (fr)
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EP0283399B1 (en
Inventor
Jean Rivoire
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Entreprise Jean Lefebvre
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Entreprise Jean Lefebvre
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Priority to AT88400614T priority Critical patent/ATE62033T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0018—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam
    • B05B7/005—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam wherein ambient air is aspirated by a liquid flow
    • B05B7/0056—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam wherein ambient air is aspirated by a liquid flow with disturbing means promoting mixing, e.g. balls, crowns
    • B05B7/0062—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam wherein ambient air is aspirated by a liquid flow with disturbing means promoting mixing, e.g. balls, crowns including sieves, porous members or the like
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/12—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
    • E01C19/16—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials for applying or spreading liquid materials, e.g. bitumen slurries
    • E01C19/17—Application by spraying or throwing
    • E01C19/176—Spraying or throwing elements, e.g. nozzles; Arrangement thereof or supporting structures therefor, e.g. spray-bars
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/45—Portable apparatus for preparing, or for preparing and applying to the road, compound liquid binders, e.g. emulsified bitumen, fluxed asphalt
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
    • E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing

Definitions

  • the present invention relates to a device for producing and spreading bitumen in the foam state, its process of implementation as well as its application to the production of surface coatings.
  • Foaming bitumen is a known technique, which consists in injecting a given quantity of water into bitumen heated to high temperature.
  • the spraying of water produces foaming which will be more or less important depending on the quality of the bitumen, the amount of water, the presence or absence of foaming products, and many surrounding factors (temperature, humidity, wind ,. ..).
  • the main property of foaming is to give bitumen a low apparent viscosity, due to the presence of a gaseous phase dispersed in the form of fine bubbles, and above all a high apparent volume which can reach up to twenty times that of bitumen at liquid state.
  • a very expanded foam will have a short lifespan, that is to say that its deflation will be rapid.
  • a foam that is little expanded but very fine will have much slower deflation.
  • the production of surface coatings consists in depositing a layer of bitumen on the support to be covered, spreading gravel on the bitumen and compacting the gravel.
  • the viscosity of the binders has been adjusted to different values by means of fluxing agents (coal oils) or thinning agents (kerosene), depending on the traffic and climate conditions, which allows minimize the discharge of gravel during the more or less long period of evaporation of the solvents, where the fixing of the gravel on the pavement is strengthened.
  • This technique has the disadvantage of evaporating some 50,000 tonnes of solvents per year into the atmosphere.
  • the use of these solvents increases the cost of producing the surface coating.
  • Bitumen foam makes it possible to provide a decisive improvement in the production of surface coatings, by solving the problem of wetting gravel with viscous binders capable of withstanding intense, heavy and rapid traffic directly after implementation.
  • Patent FR-A-2 370 126 relates to a process for producing surface coatings in which a binder in the form of foam is used. The aggregates are then spread over a layer of bitumen in the foam state. The foam is produced either by injecting a gas into the binder brought to a temperature higher than the condensation temperature, or by vaporization of a liquid in a binder.
  • the foam is obtained by injecting a gas or a liquid into hot bitumen under pressure, the mixture of which begins to foam as soon as it leaves the ejection nozzles, by expansion of the gas or vaporization of the injected liquid. .
  • These foams continue to develop on the application support before finally deflating. Controlling the characteristics of these foams is very difficult, in particular its dimensional development and its lifespan (time taken to deflate to the point of losing its structural and behavioral advantages).
  • the present invention aims to provide a solution to the problems set out above and aims in particular to improve the characteristics of bitumen foams (lifetime %) so that they are fine and stable, and that their handling is facilitated.
  • the present invention provides a device and a method for producing and spreading bitumen which make it possible to develop a bitumen foam inside an enclosure and to spread it in a continuous veil, said foam having improved characteristics compared to to the foams of the prior art. It also relates to the use of the method and the device according to the invention, for the production of surface coatings.
  • the bitumen production and spreading device is characterized in that it comprises: an enclosure having an open face on the side towards which the spreading is carried out, said face being equipped with at least one grid, equipment for simultaneously spraying bitumen and water towards said grid making it possible to ensure, near the latter, the dispersion of water in the bitumen, - Means for producing a stream of air inside said enclosure, said stream of air passing through said enclosure and discharging through said grid.
  • Such a device remains simple to design, manufacture, operate, maintain and repair, and it can be very easily adapted to any bitumen spreading ramp, by adding only a water circuit and a circuit. of air.
  • the jets of sprayed bitumen and the jets of sprayed water completely overlap at least in the immediate vicinity of said grid, practically without impact on the side walls of the enclosure.
  • the production and spreading method according to the invention is characterized in that, inside an enclosure having an open face on the side towards which the spreading is carried out, said face being equipped with at least one grid, performs the simultaneous spraying of bitumen and water towards said grid, so as to ensure, near this last, the dispersion of water in the bitumen and in that a stream of air is produced simultaneously inside said enclosure, said stream of air passing through said enclosure and discharging through said grid.
  • the invention applies to the production of surface coatings, which involves a step of depositing bitumen foam on the support to be covered, a step of spreading gravel on said foam and a step of compacting said gravel.
  • This method of a type known per se, is characterized in that said deposit of foam is implemented according to the method described above.
  • bitumen also denotes bitumen incorporating additives.
  • additives are well known to those skilled in the art; they are essentially surface-active agents promoting the formation of foam and giving the bitumen better adhesiveness.
  • these additives do not include the fluidizers and the fluxing agents, which it is precisely sought to eliminate. In some cases, the water may also contain wetting agents.
  • FIG. 1 there is shown a cross-sectional view of a device according to the present invention.
  • This device comprises an enclosure 10 which can be fixed by any conventional means to a vehicle intended for spreading bitumen.
  • This enclosure of substantially parallelepiped shape has an open base 11, equipped with at least one grid.
  • the open base 11 has two parallel grids 12 and 12 ⁇ , spaced apart by a distance equal to or less than about 15 mm.
  • the enclosure 10 is further equipped with a plurality of bitumen spray nozzles 13 of which only one is visible here. These nozzles 13 are oriented along the axis 14 of the transverse section of the enclosure 10, perpendicular to the planes of the grids 12 and 12 ⁇ . These nozzles are connected to a liquid bitumen supply circuit of known type which is not shown here.
  • the enclosure 10 further comprises water spray nozzles 15 coupled to a circuit independent of the bitumen supply circuit.
  • the axis 16 of the water spray nozzle 15 can advantageously be angularly offset with respect to the axis of the bitumen spray nozzle by an angle less than or equal to 15 °.
  • the choice of the particular nature and the adjustment of the spray nozzles 13 and 15 make it possible to obtain conical or lamelliform jets, completely overlapping at the level of the grid 12, without meeting the lateral faces of the enclosure 10.
  • the enclosure 10 finally comprises means (not shown here) which are intended to produce a current of air inside the latter. They consist, for example, of a blower fitted with heating means connected to a duct which opens onto a lateral face of the enclosure 10; the air current crosses the enclosure and is evacuated by the grids 12 and 12 ⁇ .
  • the hot bitumen and the water at room temperature, both under pressure, are sprayed simultaneously on the grid 12 by the nozzles 13 and 15, respectively. Their impact on the grid 12 causes the bitumen and water to spray, allowing the bitumen to foam.
  • a current of forced hot air drives this foam out of the enclosure 10, through the grids 12 and 12 ⁇ .
  • bitumen and its additives, the adjustment of the flow rates and temperatures of the bitumen of water and air, as well as the dimensioning of the mesh of (or) grid (s), and the hopper of evacuation allowing to evacuate a continuous sheet of bitumen foam over the entire length of the enclosure.
  • the adjustment of the speed of movement of the device allows the spreading of this sheet on the support to be covered.
  • bitumen and water supply circuits are closed.
  • bitumen has accumulated at the grids.
  • the hot air expels this bitumen from the enclosure and cleans the latter.
  • Tables I and II below give technical characteristics of the foams produced using a device such as that described with reference to FIG. 1. The tests were carried out with a bitumen spray nozzle equipped with a GIESLER type jet ®.
  • FIG. 2 illustrates, very schematically, in longitudinal and transverse sections, an embodiment of the device according to the invention.
  • the enclosure 20 comprises 8 conical bitumen spray jets 21 arranged at equal distance from each other.
  • the water spray nozzles 22 are arranged between the bitumen spray nozzles 21 so that at the level of the grid 23 the jets of bitumen 24 and water 25 overlap.
  • a lateral inlet 26 for hot air drives the foam formed through the grid 23.
  • the enclosure 20 is further equipped with a converging double deflector 27 which channels the foam pushed beyond the grid 25 by the current of air.
  • FIG. 3 Another embodiment is illustrated in FIG. 3.
  • the enclosure 30 comprises 8 conical bitumen spray jets 31.
  • the water spray nozzles 32 are oriented in the same direction as the bitumen spray nozzles 31
  • the setting of the nozzles 32 is such that a jet of bitumen 33, in the vicinity of the grid 34, is covered by the two water jets 35 and 35 ⁇ located on each side of the jet of bitumen 33.
  • the enclosure 30 is further equipped with an air inlet 36 and a double convergent deflector 37.
  • Figures 4 and 5 respectively, in longitudinal and cross section, and in top view.
  • the enclosure 40 comprises several nozzles 41 for spraying bitumen oriented towards the grid 46.
  • Water spray nozzles 43 are arranged on the lateral face 44 of the enclosure opposite the air duct 45, and just behind the nozzles 41 in the direction of movement of the device illustrated by two arrows in solid lines.
  • the bitumen jets 41 are flat jets parallel to each other. These jets can advantageously be inclined at an angle of 15 to 20 ° relative to the major axis of the device.
  • the bitumen outlet pressure may, in this particular case, be advantageously between 2.105 and 4.105 Pa.
  • the device of the present invention may include spraying equipment which consists of a central part and two unfoldable "extensions".
  • the preferred dimensions of these elements are approximately 2.40 m and 1.00 m, respectively.
  • the enclosure then comprises three elements which are juxtaposed. The interface between two consecutive elements consists of two vertical partitions which have no effect on the continuity of the foam mat.
  • the spreading width can also be adjusted by completely stopping one or more bitumen and water jets.
  • the enclosure is then fitted with vertical shutters.
  • the hydropneumatic or electric control for closing and opening the jets acts simultaneously on the flaps which move and isolate the spreading zone from the rest of the device.

Abstract

The apparatus comprises: a chamber (10) having a face (11) open on the side towards which the spreading is effected, the said face being equipped with at least one grid (12); equipment for simultaneously spraying bitumen and water towards the said grid (12) in order to ensure, in the vicinity of the latter, dispersion of the water in the bitumen, and means for producing, inside the said chamber (10), a current of air passing through the latter and being discharged via the said grid (12). The invention also relates to a process for implementing this apparatus and to a process for producing surface coatings. <IMAGE>

Description

La présente invention concerne un dispositif de production et de répandage de bitume à l'état de mousse, son procédé de mise en oeuvre ainsi que son application à la réalisation d'enduits superficiels.The present invention relates to a device for producing and spreading bitumen in the foam state, its process of implementation as well as its application to the production of surface coatings.

Le moussage du bitume est une technique connue, qui consiste à injecter une quantité d'eau déterminée dans du bitume porté à haute température. La vaporisation de l'eau produit un moussage qui sera plus ou moins important suivant la qualité du bitume, la quantité d'eau, la présence ou l'absence de produits moussants, et de nombreux facteurs environnants (température, humidité, vent,...).Foaming bitumen is a known technique, which consists in injecting a given quantity of water into bitumen heated to high temperature. The spraying of water produces foaming which will be more or less important depending on the quality of the bitumen, the amount of water, the presence or absence of foaming products, and many surrounding factors (temperature, humidity, wind ,. ..).

Le moussage a pour propriété essentielle de conférer au bitume, une viscosité apparente faible, due à la présence d'une phase gazeuse dispersée sous forme de fines bulles, et surtout un volume apparent élevé qui peut atteindre jusqu'à vingt fois celui du bitume à l'état liquide. Une mousse très expansée aura une durée de vie courte, c'est-à-dire que son dégonflement sera rapide. Une mousse peu expansée mais très fine aura un dégonflement beaucoup plus lent.The main property of foaming is to give bitumen a low apparent viscosity, due to the presence of a gaseous phase dispersed in the form of fine bubbles, and above all a high apparent volume which can reach up to twenty times that of bitumen at liquid state. A very expanded foam will have a short lifespan, that is to say that its deflation will be rapid. A foam that is little expanded but very fine will have much slower deflation.

La réalisation d'enduits superficiels consiste à déposer une couche de bitume sur le support à recouvrir, à répandre des gravillons sur le bitume et à compacter les gravillons.The production of surface coatings consists in depositing a layer of bitumen on the support to be covered, spreading gravel on the bitumen and compacting the gravel.

Ce procédé offre une solution séduisante au problème d'entre­tien des revêtements. Toutefois, il est nécessaire de fixer les gravillons dans la couche de bitume de façon que le revêtement ne se dégrade pas au passage de véhicules. Donc, le problème le plus critique dans la réalisation des enduits superficiels se situe au niveau du choix de la viscosité du liant qui doit satisfaire deux exigences contradictoires :
    - d'une part, il faut que le liant ait une viscosité relativement faible au moment du gravillonnage pour assurer un mouillage efficace des granulats,
    - d'autre part, pour que les granulats ne soient pas arrachés par la circulation, il faut que le liant présente une viscosité suffisamment élevée après refroidissement, de façon à assurer à la liaison granulat/sol, une cohésion appropriée au trafic.This process offers an attractive solution to the problem of maintenance of coatings. However, it is necessary to fix the gravel in the bitumen layer so that the coating does not deteriorate when passing vehicles. Therefore, the most critical problem in the production of surface coatings lies in the choice of the viscosity of the binder which must satisfy two contradictory requirements:
on the one hand, the binder must have a relatively low viscosity at the time of graveling to ensure effective wetting of the aggregates,
- On the other hand, so that the aggregates are not torn away by circulation, the binder must have a sufficiently high viscosity after cooling, so as to ensure the aggregate / soil bond, a cohesion suitable for traffic.

Il s'agit donc de trouver le meilleur compromis de viscosité du liant, qui concilie l'exigence d'un mouillage efficace des granulats avec celle de la solidité de leur fixation au sol, cela en supposant bien entendu que soient maîtrisés les autres paramètres conditionnant le résultat d'un enduit (teneur en fines et en eau des gravillons, état du support, teneur en liant, affinité liant-granulat, mise en oeuvre).It is therefore a question of finding the best compromise in viscosity of the binder, which reconciles the requirement for effective wetting of the aggregates. with that of the solidity of their fixing to the ground, this supposing of course that the other parameters conditioning the result of a coating are controlled (fine and water content of the gravel, state of the support, content of binder, binder affinity- aggregate, implementation).

Jusqu'à présent, pour assurer le mouillage des gravillons, on ajuste la viscosité des liants à différentes valeurs au moyen de fluxants (huiles de houille) ou fluidifiants (kérosène), en fonction des conditions de circulation et de climat, ce qui permet de minimiser les rejets des gravillons pendant la période plus ou moins longue d'évaporation des solvants, où la fixation des gravillons sur la chaussée s'affermit.Up to now, to ensure the wetting of gravel, the viscosity of the binders has been adjusted to different values by means of fluxing agents (coal oils) or thinning agents (kerosene), depending on the traffic and climate conditions, which allows minimize the discharge of gravel during the more or less long period of evaporation of the solvents, where the fixing of the gravel on the pavement is strengthened.

Cette technique présente l'inconvénient d'évaporer dans l'atmosphère quelques 50 000 tonnes de solvants par an. De plus, l'utili­sation de ces solvants augmente le coût de réalisation de l'enduit superficiel.This technique has the disadvantage of evaporating some 50,000 tonnes of solvents per year into the atmosphere. In addition, the use of these solvents increases the cost of producing the surface coating.

La mousse de bitume permet d'apporter une amélioration déterminante dans la réalisation des enduits superficiels, en solutionnant le problème du mouillage des gravillons par des liants visqueux capables de supporter directement après mise en oeuvre, un trafic intense, lourd et rapide.Bitumen foam makes it possible to provide a decisive improvement in the production of surface coatings, by solving the problem of wetting gravel with viscous binders capable of withstanding intense, heavy and rapid traffic directly after implementation.

Le brevet FR-A-2 370 126 se rapporte à un procédé pour la réalisation d'enduits superficiels dans lequel on utilise un liant sous forme de mousse. Les granulats sont alors répandus sur une couche de bitume à l'état de mousse. La mousse est réalisée soit par injection d'un gaz dans le liant porté à une température supérieure à la température de condensation, soit par vaporisation d'un liquide dans un liant.Patent FR-A-2 370 126 relates to a process for producing surface coatings in which a binder in the form of foam is used. The aggregates are then spread over a layer of bitumen in the foam state. The foam is produced either by injecting a gas into the binder brought to a temperature higher than the condensation temperature, or by vaporization of a liquid in a binder.

Dans cette technique, la mousse est obtenue par l'injection d'un gaz ou un liquide dans du bitume chaud sous pression, dont le mélange commence à mousser dès sa sortie des buses d'éjection, par détente du gaz ou vaporisation du liquide injecté. Ces mousses continuent à se développer sur le support d'application avant de se dégonfler finalement. La maîtrise des caractéristiques de ces mousses s'avère très difficile, et notamment son développement dimensionnel et sa durée de vie (temps mis pour se dégonfler au point de perdre ses avantages de structure et de compor­tement).In this technique, the foam is obtained by injecting a gas or a liquid into hot bitumen under pressure, the mixture of which begins to foam as soon as it leaves the ejection nozzles, by expansion of the gas or vaporization of the injected liquid. . These foams continue to develop on the application support before finally deflating. Controlling the characteristics of these foams is very difficult, in particular its dimensional development and its lifespan (time taken to deflate to the point of losing its structural and behavioral advantages).

La présente invention a pour but d'apporter une solution aux problèmes énoncés plus haut et vise en particulier à améliorer les caractéristiques des mousses de bitume (durée de vie...) de telle sorte qu'elles soient fines et stables, et que leur maniement soit facilité. La présente invention fournit un dispositif et un procédé de production et de répandage de bitume qui permettent d'élaborer une mousse de bitume à l'intérieur d'une enceinte et de la répandre en un voile continu, ladite mousse présentant des caractéristiques améliorées par rapport aux mousses de la technique antérieure. Elle concerne aussi l'utilisation du procédé et du dispositif selon l'invention, pour la réalisation d'enduits superficiels.The present invention aims to provide a solution to the problems set out above and aims in particular to improve the characteristics of bitumen foams (lifetime ...) so that they are fine and stable, and that their handling is facilitated. The present invention provides a device and a method for producing and spreading bitumen which make it possible to develop a bitumen foam inside an enclosure and to spread it in a continuous veil, said foam having improved characteristics compared to to the foams of the prior art. It also relates to the use of the method and the device according to the invention, for the production of surface coatings.

Le dispositif de production et de répandage de bitume selon l'invention est caractérisé en ce qu'il comprend :
    - une enceinte présentant une face ouverte du côté vers lequel on effectue le répandage, ladite face étant équipée d'au moins une grille,
    - un équipement de pulvérisation simultanée de bitume et d'eau vers ladite grille permettant d'assurer à proximité de cette dernière, la dispersion de l'eau dans le bitume,
    - des moyens permettant de produire un courant d'air à l'intérieur de ladite enceinte, ledit courant d'air traversant ladite enceinte et s'évacuant par ladite grille.The bitumen production and spreading device according to the invention is characterized in that it comprises:
an enclosure having an open face on the side towards which the spreading is carried out, said face being equipped with at least one grid,
equipment for simultaneously spraying bitumen and water towards said grid making it possible to ensure, near the latter, the dispersion of water in the bitumen,
- Means for producing a stream of air inside said enclosure, said stream of air passing through said enclosure and discharging through said grid.

Un tel dispositif reste simple de conception, de fabrication, d'exploitation, d'entretien et de réparation, et il peut s'adapter très aisément sur toute rampe d'épandage de bitume, en ajoutant seulement un circuit d'eau et un circuit d'air.Such a device remains simple to design, manufacture, operate, maintain and repair, and it can be very easily adapted to any bitumen spreading ramp, by adding only a water circuit and a circuit. of air.

Selon une autre caractéristique de l'invention, les jets de bitume pulvérisé et les jets d'eau pulvérisée se recouvrent complètement au moins au voisinage immédiat de ladite grille, pratiquement sans impact sur les parois latérales de l'enceinte.According to another characteristic of the invention, the jets of sprayed bitumen and the jets of sprayed water completely overlap at least in the immediate vicinity of said grid, practically without impact on the side walls of the enclosure.

Le procédé de production et de répandage selon l'invention est caractérisé en ce que, à l'intérieur d'une enceinte présentant une face ouverte du côté vers lequel on effectue le répandage, ladite face étant équipée d'au moins une grille, on effectue la pulvérisation simultanée de bitume et d'eau vers ladite grille, de façon à assurer, à proximité de cette dernière, la dispersion de l'eau dans le bitume et en ce que l'on produit simultanément un courant d'air à l'intérieur de ladite enceinte, ledit courant d'air traversant ladite enceinte et s'évacuant par ladite grille.The production and spreading method according to the invention is characterized in that, inside an enclosure having an open face on the side towards which the spreading is carried out, said face being equipped with at least one grid, performs the simultaneous spraying of bitumen and water towards said grid, so as to ensure, near this last, the dispersion of water in the bitumen and in that a stream of air is produced simultaneously inside said enclosure, said stream of air passing through said enclosure and discharging through said grid.

Enfin, l'invention s'applique à la réalisation d'enduits super­ficiels, qui implique une étape de dépôt de mousse de bitume sur le support à recouvrir, une étape de répandage de gravillons sur ladite mousse et une étape de compactage desdits gravillons. Ce procédé, de type en soi connu, est caractérisé en ce que ledit dépôt de mousse est mis en oeuvre selon le procédé décrit précédemment.Finally, the invention applies to the production of surface coatings, which involves a step of depositing bitumen foam on the support to be covered, a step of spreading gravel on said foam and a step of compacting said gravel. This method, of a type known per se, is characterized in that said deposit of foam is implemented according to the method described above.

Dans la totalité du texte de la présente description et des revendications, le mot "bitume", désigne également du bitume incorporant des additifs. Ces additifs sont bien connus de l'homme du métier ; il s'agit essentiellement d'agents tensio-actifs favorisant la formation de mousse et conférant au bitume une meilleure adhésivité. Bien entendu, ces additifs n'englobent pas les fluidifiants et les fluxants, que l'on cherche précisément à écarter. L'eau pourra également contenir dans certains cas des agents mouillants.Throughout the text of this description and of the claims, the word "bitumen" also denotes bitumen incorporating additives. These additives are well known to those skilled in the art; they are essentially surface-active agents promoting the formation of foam and giving the bitumen better adhesiveness. Of course, these additives do not include the fluidizers and the fluxing agents, which it is precisely sought to eliminate. In some cases, the water may also contain wetting agents.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre, faite en référence à des dessins annexés dans lesquels :

  • - La figure 1 représente une vue en coupe transversale d'un dispositif conforme à la présente invention,
  • - la figure 2 représente, très schématiquement, en coupe longitudinale et transversale, un exemple de réalisation d'une variante du dispositif de la présente invention,
  • - la figure 3 illustre un second exemple de réalisation d'une variante du dispositif de la présente invention, en coupe longitudinale et transversale,
  • - la figure 4 illustre un exemple de réalisation préféré du dispositif de la présente invention, en coupe longitudinale et transversale, et
  • - la figure 5 est une vue de dessus du dispositif de la figure 4.
Other characteristics and advantages of the present invention will appear on reading the description which follows, made with reference to the accompanying drawings in which:
  • FIG. 1 represents a cross-sectional view of a device according to the present invention,
  • FIG. 2 very schematically shows, in longitudinal and transverse section, an embodiment of a variant of the device of the present invention,
  • FIG. 3 illustrates a second embodiment of a variant of the device of the present invention, in longitudinal and transverse section,
  • FIG. 4 illustrates a preferred embodiment of the device of the present invention, in longitudinal and transverse section, and
  • - Figure 5 is a top view of the device of Figure 4.

En référence à la figure 1, on a représenté une vue en coupe transversale d'un dispositif conforme à la présente invention.Referring to Figure 1, there is shown a cross-sectional view of a device according to the present invention.

Ce dispositif comporte une enceinte 10 qui peut être fixée par tout moyen classique à un véhicule destiné au répandage de bitume. Cette enceinte, de forme sensiblement parallélépipédique comporte une base ouverte 11, équipé d'au moins une grille. Dans le mode de réalisation particulier de la figure 1, la base ouverte 11 comporte deux grilles parallèles 12 et 12ʹ, espacées entre elles d'une distance égale ou inférieure à environ 15 mm.This device comprises an enclosure 10 which can be fixed by any conventional means to a vehicle intended for spreading bitumen. This enclosure, of substantially parallelepiped shape has an open base 11, equipped with at least one grid. In the particular embodiment of Figure 1, the open base 11 has two parallel grids 12 and 12ʹ, spaced apart by a distance equal to or less than about 15 mm.

L'enceinte 10 est en outre équipée d'une pluralité de buses de pulvérisation de bitume 13 dont une seule est visible ici. Ces buses 13 sont orientées selon l'axe 14 de la coupe transversale de l'enceinte 10, perpendiculairement aux plans des grilles 12 et 12ʹ. Ces buses sont raccordées à un circuit d'alimentation de bitume liquide de type connu qui n'est pas représenté ici.The enclosure 10 is further equipped with a plurality of bitumen spray nozzles 13 of which only one is visible here. These nozzles 13 are oriented along the axis 14 of the transverse section of the enclosure 10, perpendicular to the planes of the grids 12 and 12ʹ. These nozzles are connected to a liquid bitumen supply circuit of known type which is not shown here.

L'enceinte 10 comporte de plus des buses de pulvérisation d'eau 15 couplées à un circuit indépendant du circuit d'alimentation de bitume. L'axe 16 de la buse de pulvérisation d'eau 15 peut, de façon avantageuse, être décalé angulairement par rapport à l'axe de la buse de pulvérisation de bitume d'un angle inférieur ou égal à 15°. Le choix de la nature particulière et le réglage des buses de pulvérisation 13 et 15 permettent d'obtenir des jets coniques ou lamelliformes, se recouvrant totalement au niveau de la grille 12, sans rencontrer les faces latérales de l'enceinte 10.The enclosure 10 further comprises water spray nozzles 15 coupled to a circuit independent of the bitumen supply circuit. The axis 16 of the water spray nozzle 15 can advantageously be angularly offset with respect to the axis of the bitumen spray nozzle by an angle less than or equal to 15 °. The choice of the particular nature and the adjustment of the spray nozzles 13 and 15 make it possible to obtain conical or lamelliform jets, completely overlapping at the level of the grid 12, without meeting the lateral faces of the enclosure 10.

L'enceinte 10 comporte enfin des moyens (non représentés ici) qui sont destinés à produire un courant d'air à l'intérieur de celle-ci. Ils consistent par exemple en une soufflerie équipée de moyens de chauffage reliée à un conduit qui débouche sur une face latérale de l'enceinte 10 ; le courant d'air traverse l'enceinte et s'évacue par les grilles 12 et 12ʹ.The enclosure 10 finally comprises means (not shown here) which are intended to produce a current of air inside the latter. They consist, for example, of a blower fitted with heating means connected to a duct which opens onto a lateral face of the enclosure 10; the air current crosses the enclosure and is evacuated by the grids 12 and 12ʹ.

Toujours en référence à la figure 1, le fonctionnement du dispositif est alors le suivant.Still with reference to FIG. 1, the operation of the device is then as follows.

Le bitume chaud et l'eau à température ambiante, les deux sous pression, sont projetés simultanément sur la grille 12 par les buses 13 et 15, respectivement. Leur impact sur la grille 12 provoque la pulvérisation du bitume et de l'eau, permettant le moussage du bitume.The hot bitumen and the water at room temperature, both under pressure, are sprayed simultaneously on the grid 12 by the nozzles 13 and 15, respectively. Their impact on the grid 12 causes the bitumen and water to spray, allowing the bitumen to foam.

Un courant d'air chaud forcé chasse cette mousse à l'extérieur de l'enceinte 10, au travers des grilles 12 et 12ʹ.A current of forced hot air drives this foam out of the enclosure 10, through the grids 12 and 12ʹ.

Le choix du bitume et de ses additifs, le réglage des débits et des températures du bitume de l'eau et de l'air, ainsi que le dimension­nement de la maille de (ou des) grille(s) , et la trémie d'évacuation permettant d'évacuer une nappe continue de mousse de bitume sur toute la longueur de l'enceinte.The choice of bitumen and its additives, the adjustment of the flow rates and temperatures of the bitumen of water and air, as well as the dimensioning of the mesh of (or) grid (s), and the hopper of evacuation allowing to evacuate a continuous sheet of bitumen foam over the entire length of the enclosure.

Le réglage de la vitesse de déplacement du dispositif permet l'épandage de cette nappe sur le support à recouvrir.The adjustment of the speed of movement of the device allows the spreading of this sheet on the support to be covered.

En fin d'utilisation du dispositif, il est souhaitable de faire circuler de l'air chaud à l'intérieur de l'enceinte, alors que les circuits d'alimentation de bitume et d'eau sont fermés. En effet, au cours de la réalisation de la mousse de bitume, du bitume s'est accumulé au niveau des grilles. L'air chaud, expulse ce bitume hors de l'enceinte et nettoie cette dernière.At the end of use of the device, it is desirable to circulate hot air inside the enclosure, while the bitumen and water supply circuits are closed. In fact, during the production of the bitumen foam, bitumen has accumulated at the grids. The hot air expels this bitumen from the enclosure and cleans the latter.

Les tableaux I et II ci-après donnent des caractéristiques techniques des mousses réalisées grâce à un dispositif tel que celui décrit en référence à la figure 1. Les essais ont été réalisés avec une buse de pulvérisation de bitume équipée d'un jet de type GIESLER®.Tables I and II below give technical characteristics of the foams produced using a device such as that described with reference to FIG. 1. The tests were carried out with a bitumen spray nozzle equipped with a GIESLER type jet ®.

Les caractéristiques de l'enceinte sont les suivantes :
- Distance buse de pulvérisation de bitume/première grille : 73 mm
- Angle au sommet du jet de bitume sous 4,6x10⁵ Pa: = 50°
- Dimension transversale des grilles : 68 mm
- Ouverture des mailles : 2 et 3 mm

Figure imgb0001
Figure imgb0002
 The characteristics of the enclosure are as follows:
- Distance of bitumen spray nozzle / first grid: 73 mm
- Angle at the top of the bitumen jet at 4.6x10⁵ Pa: = 50 °
- Transversal dimension of the grids: 68 mm
- Mesh opening: 2 and 3 mm
Figure imgb0001
Figure imgb0002

A la lecture des tableaux I et II, il apparaît que la pression de pulvérisation de 5,6.10⁵ Pa est plus favorable que la pulvérisation à 4,6.10⁵ Pa et donne lieu à une mousse plus fine et de structure plus homogène ; cette constatation n'est toutefois valable que pour des jets coniques.On reading Tables I and II, it appears that the spraying pressure of 5.6.10⁵ Pa is more favorable than the spraying at 4.6.10⁵ Pa and gives rise to a finer foam and of more homogeneous structure; this observation is however only valid for conical jets.

Dans un fonctionnement à 5,6.10⁵ Pa, il est notable que les grilles ayant une ouverture de mailles de 3 millimètres donnent un meilleur taux d'expansion que les autres grilles.In operation at 5,6.10⁵ Pa, it is notable that the grids having a mesh opening of 3 millimeters give a better rate of expansion than the other grids.

Plus on rapproche les deux grilles (jusqu'à n'en former plus qu'une seule), plus on augmente le taux d'expansion de la mousse ; mais en même temps, on diminue sa durée de vie.The closer the two grids are brought together (until they form only one), the more the foam expansion rate is increased; but at the same time, it decreases its lifespan.

Dans la pratique, il apparaît que la mousse réalisée avec un système de grilles ayant une ouverture de mailles de 3 millimètres est très fine, très homogène et exempte de grosses bulles.In practice, it appears that the foam produced with a system of grids having a mesh opening of 3 millimeters is very fine, very homogeneous and free of large bubbles.

La figure 2 illustre, très schématiquement, en coupes longi­tudinale et transversale, un mode de réalisation du dispositif selon l'invention. L'enceinte 20 comporte 8 jets coniques de pulvérisation de bitume 21 disposés à égale distance les uns des autres. Les buses de pulvérisation d'eau 22 sont disposées entre les buses 21 de pulvérisation du bitume de telle façon qu'au niveau de la grille 23 les jets de bitume 24 et d'eau 25 se recouvrent. Une entrée latérale 26 d'air chaud entraîne la mousse formée à travers la grille 23. L'enceinte 20 est équipée en outre d'un double déflecteur convergent 27 qui canalise la mousse poussée au-delà de la grille 25 par le courant d'air.FIG. 2 illustrates, very schematically, in longitudinal and transverse sections, an embodiment of the device according to the invention. The enclosure 20 comprises 8 conical bitumen spray jets 21 arranged at equal distance from each other. The water spray nozzles 22 are arranged between the bitumen spray nozzles 21 so that at the level of the grid 23 the jets of bitumen 24 and water 25 overlap. A lateral inlet 26 for hot air drives the foam formed through the grid 23. The enclosure 20 is further equipped with a converging double deflector 27 which channels the foam pushed beyond the grid 25 by the current of air.

Un autre mode de réalisation est illustré à la figure 3. L'enceinte 30 comporte 8 jets coniques de pulvérisation de bitume 31. Toutefois, les buses de pulvérisation d'eau 32 sont orientées dans la même direction que les buses de pulvérisation de bitume 31. Le réglage des buses 32 est tel qu'un jet de bitume 33, au voisinage de la grille 34, est recouvert par les deux jets d'eau 35 et 35ʹ situé de chaque côté du jet de bitume 33. L'enceinte 30 est en outre équipée d'une arrivée d'air 36 et d'un double déflecteur convergent 37.Another embodiment is illustrated in FIG. 3. The enclosure 30 comprises 8 conical bitumen spray jets 31. However, the water spray nozzles 32 are oriented in the same direction as the bitumen spray nozzles 31 The setting of the nozzles 32 is such that a jet of bitumen 33, in the vicinity of the grid 34, is covered by the two water jets 35 and 35ʹ located on each side of the jet of bitumen 33. The enclosure 30 is further equipped with an air inlet 36 and a double convergent deflector 37.

Enfin, un troisième mode de réalisation est illustré aux figures 4 et 5, respectivement, en coupe longitudinale et transversale, et en vue de dessus.Finally, a third embodiment is illustrated in Figures 4 and 5, respectively, in longitudinal and cross section, and in top view.

L'enceinte 40 comporte plusieurs buses 41 de pulvérisation de bitume orientées vers la grille 46. Des buses de pulvérisation d'eau 43 sont disposées sur la face latérale 44 de l'enceinte opposée à la con­duite d'air 45, et juste derrière les buses 41 dans le sens du déplace­ment du dispositif illustré par deux flèches en traits pleins. Les jets de bitume 41 sont des jets plats parallèles entre eux. Ces jets peuvent être avantageusement inclinés selon un angle de 15 à 20° par rapport au grand axe du dispositif.The enclosure 40 comprises several nozzles 41 for spraying bitumen oriented towards the grid 46. Water spray nozzles 43 are arranged on the lateral face 44 of the enclosure opposite the air duct 45, and just behind the nozzles 41 in the direction of movement of the device illustrated by two arrows in solid lines. The bitumen jets 41 are flat jets parallel to each other. These jets can advantageously be inclined at an angle of 15 to 20 ° relative to the major axis of the device.

La pression de sortie du bitume pourra, dans ce cas particu­lier, être avantageusement comprise entre 2.10⁵ et 4.10⁵ Pa.The bitumen outlet pressure may, in this particular case, be advantageously between 2.10⁵ and 4.10⁵ Pa.

Afin de permettre un répandage de mousse de bitume sur une largeur variable, le dispositif de la présente invention peut com­porter un équipement de pulvérisation qui se compose d'une partie centrale et de deux "rallonges" dépliables. Les dimensions préférées de ces éléments sont, respectivement, d'environ 2,40 m et de 1,00 m. L'enceinte comporte alors trois éléments qui se juxtaposent. L'interface entre deux éléments consécutifs est constituée de deux cloisons verti­cales qui n'ont pas d'effet sur la continuité du tapis de mousse.In order to allow spreading of bitumen foam over a variable width, the device of the present invention may include spraying equipment which consists of a central part and two unfoldable "extensions". The preferred dimensions of these elements are approximately 2.40 m and 1.00 m, respectively. The enclosure then comprises three elements which are juxtaposed. The interface between two consecutive elements consists of two vertical partitions which have no effect on the continuity of the foam mat.

La largeur de répandage peut aussi être ajustée par l'arrêt complet d'un ou plusieurs jets de bitume et d'eau. L'enceinte est alors équipée de volets verticaux. La commande hydropneumatique ou électri­que de fermeture et d'ouverture des jets agit simultanément sur les volets qui se déplacent et isolent la zone de répandage du reste du dispositif.The spreading width can also be adjusted by completely stopping one or more bitumen and water jets. The enclosure is then fitted with vertical shutters. The hydropneumatic or electric control for closing and opening the jets acts simultaneously on the flaps which move and isolate the spreading zone from the rest of the device.

Claims (11)

1. Dispositif de production et de répandage de bitume à l'état de mousse, caractérisé en ce qu'il comprend :
      - une enceinte (10,20,30,40) présentant une face (11) ouverte du côté vers lequel on effectue le répandage, ladite face étant équipée d'au moins une grille (12,12ʹ,23,34,46),
      - un équipement de pulvérisation simultanée de bitume et d'eau vers ladite grille (12,23,34,46) pour assurer, à proximité de cette dernière, la dispersion de l'eau dans le bitume, et
      - des moyens pour produire à l'intérieur de ladite enceinte (10,20,­30,40), un courant d'air traversant cette dernière et s'évacuant par ladite grille (12,23,34,46).1. Device for producing and spreading bitumen in the foam state, characterized in that it comprises:
- an enclosure (10,20,30,40) having a face (11) open on the side towards which the spreading is carried out, said face being equipped with at least one grid (12,12ʹ, 23,34,46),
- equipment for simultaneously spraying bitumen and water towards said grid (12, 23, 34, 46) to ensure, near the latter, the dispersion of water in the bitumen, and
- Means for producing inside said enclosure (10,20,30,40), a current of air passing through the latter and discharging through said grid (12,23,34,46). 2. Dispositif de production et de répandage de bitume à l'état de mousse selon la revendication 1, caractérisé en ce que les jets de bitume pulvérisé et les jets d'eau pulvérisée se recouvrent complète­ment au moins au voisinage immédiat de ladite grille et, pratiquement sans impact sur les parois latérales de l'enceinte.2. Device for producing and spreading bitumen in the foam state according to claim 1, characterized in that the jets of sprayed bitumen and the jets of sprayed water completely overlap at least in the immediate vicinity of said grid and, practically without impact on the side walls of the enclosure. 3. Dispositif de production et de répandage de bitume à l'état de mousse selon la revendication 2, caractérisé en ce que ledit équipement de pulvérisation est constitué d'une rampe d'alimentation de bitume et d'un circuit indépendant d'alimentation d'eau, chacun étant muni d'au moins une buse de pulvérisation vers ladite grille.3. Device for producing and spreading bitumen in the foam state according to claim 2, characterized in that said spraying equipment consists of a bitumen feed ramp and an independent feed circuit d 'water, each being provided with at least one spray nozzle towards said grid. 4. Dispositif de production et de répandage de bitume à l'état de mousse selon la revendication 3, caractérisé en ce que ladite buse de pulvérisation de bitume (13,21,31,41) s'étend sensiblement perpendicu­lairement au plan de ladite grille.4. Device for producing and spreading bitumen in the foam state according to claim 3, characterized in that said bitumen spray nozzle (13,21,31,41) extends substantially perpendicular to the plane of said grid. . 5. Dispositif de production et de répandage de bitume à l'état de mousse selon la revendication 4, caractérisé en ce que l'axe de ladite buse de pulvérisation d'eau (5,22,43) est décalée angulairement par rapport à ladite buse de pulvérisation de bitume (13,21,41), d'un angle inférieur ou égal à 15°.5. Device for producing and spreading bitumen in the foam state according to claim 4, characterized in that the axis of said water spray nozzle (5,22,43) is angularly offset with respect to said bitumen spray nozzle (13,21,41), with an angle less than or equal to 15 °. 6. Dispositif de production et de répandage de bitume à l'état de mousse selon l'une des revendications 1 à 5, caractérisé en ce que les moyens permettant de produire ledit courant d'air sont constitués d'une soufflerie reliée à au moins un conduit qui débouche sur au moins l'une des faces latérales de ladite enceinte.6. Device for producing and spreading bitumen in the foam state according to one of claims 1 to 5, characterized in that the means making it possible to produce said air stream consist of a blower connected to at least a conduit which opens onto at least one of the lateral faces of said enclosure. 7. Dispositif de production et de répandage de bitume à l'état de mousse selon l'une des revendications 1 à 6, caractérisé en ce qu'il comporte deux grilles parallèles (12,12ʹ) voisines l'une de l'autre de préférence espacées entre elles d'une distance inférieure ou égale à environ 15 mm.7. Device for producing and spreading bitumen in the foam state according to one of claims 1 to 6, characterized in that it comprises two parallel grids (12,12ʹ) adjacent to each other of preferably spaced apart by a distance less than or equal to about 15 mm. 8. Dispositif de production et de répandage de bitume à l'état de mousse selon l'une des revendications 3 à 7, caractérisé en ce que la pression à la sortie de ladite buse de pulvérisation de bitume est d'au moins 2.10⁵ Pa.8. Device for producing and spreading bitumen in the foam state according to one of claims 3 to 7, characterized in that the pressure at the outlet of said bitumen spray nozzle is at least 2.10⁵ Pa . 9. Dispositif de production et de répandage de bitume à l'état de mousse selon l'une des revendications 1 à 8, caractérisé en ce qu'au moins l'une des grandes faces latérales de ladite enceinte se prolonge par un déflecteur.9. Device for producing and spreading bitumen in the foam state according to one of claims 1 to 8, characterized in that at least one of the large lateral faces of said enclosure is extended by a deflector. 10. Procédé de production et de répandage de bitume à l'état de mousse, caractérisé en ce que, à l'intérieur d'une enceinte (10,20,30,40) présentant une face (11) ouverte du côté vers lequel on effectue le répandage, ladite face étant équipée d'au moins une grille (12,23,34,46), on effectue la pulvérisation simultanée de bitume et d'eau vers ladite grille, de façon à assurer, à proximité de cette dernière, la dispersion de l'eau dans le bitume et en ce que l'on produit simultanément un courant d'air à l'intérieur de ladite enceinte, ledit courant d'air traver­sant ladite enceinte (10,20,30,40) et s'évacuant par ladite grille (12,23,­34,46).10. A method of producing and spreading bitumen in the foam state, characterized in that, inside an enclosure (10,20,30,40) having a face (11) open on the side towards which spreading is carried out, said face being equipped with at least one grid (12,23,34,46), the bitumen and water are sprayed simultaneously towards said grid, so as to ensure, near the latter , the dispersion of water in the bitumen and in that a stream of air is produced simultaneously inside said enclosure, said stream of air passing through said enclosure (10,20,30,40) and discharging through said grid (12,23,34,46). 11. Application du procédé de production et de répandage selon la revendication 10, à la réalisation d'enduits superficiels.11. Application of the production and spreading method according to claim 10, to the production of surface coatings.
EP88400614A 1987-03-19 1988-03-15 Apparatus and process for producing and spraying bituminous foam, use in surface dressing Expired - Lifetime EP0283399B1 (en)

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AT88400614T ATE62033T1 (en) 1987-03-19 1988-03-15 DEVICE AND PROCESS FOR THE PREPARATION AND APPLICATION OF FOAM BITUMEN, USE IN SURFACE TREATMENT.

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FR8703817 1987-03-19
FR8703817A FR2612533B1 (en) 1987-03-19 1987-03-19 DEVICE FOR SPREADING BITUMEN IN THE FOAM CONDITION, PROCESS FOR IMPLEMENTING IT AND METHOD FOR PRODUCING SURFACE COATINGS

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EP0382647A1 (en) * 1989-02-10 1990-08-16 Entreprise Jean Lefebvre Apparatus for spreading a layer, particularly a bituminous road surface
FR2663943A1 (en) * 1990-06-29 1992-01-03 Beugnet Sa BITUMEN BINDER FOR COATING PAVEMENTS AND METHOD FOR MANUFACTURING SUCH A BINDER.
WO1998035102A1 (en) * 1997-02-08 1998-08-13 Wirtgen Gmbh Device for paving roadways and device for producing foamed bitumen
FR2800104A1 (en) * 1999-10-22 2001-04-27 Secmair Process, for carrying out thin surfacing of road, includes spreading first layer of hot bitumen, laying thin layer of hot water followed by layer of hot bitumen and finally spreading layer of stones on top
WO2002066744A1 (en) * 2001-02-21 2002-08-29 Secmair Method and vehicle for pavement surface dressing
FR2849874A1 (en) * 2003-01-14 2004-07-16 Famatec Bitumen binder injection device for use in road work, has mixing chamber with annular insulation room defined between internal and external wall, and liquid injecting unit engaged to opening of mixing chamber
ITMI20101108A1 (en) * 2010-06-18 2011-12-19 Bernardi Impianti Internat S P A EXPANDED BITUMEN GENERATOR AND EXPANDED BITUMEN GENERATION METHOD, PARTICULARLY FOR THE PRODUCTION OF COLD BITUMINOUS CONGLOMERATE
EP2556194A2 (en) * 2010-04-06 2013-02-13 BOMAG GmbH Apparatus for producing foamed bitumen and process for servicing said apparatus
CN103711059A (en) * 2013-12-19 2014-04-09 福建南方路面机械有限公司 Asphalt foaming device

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EP0382647A1 (en) * 1989-02-10 1990-08-16 Entreprise Jean Lefebvre Apparatus for spreading a layer, particularly a bituminous road surface
FR2643095A1 (en) * 1989-02-10 1990-08-17 Lefebvre Jean Ets METHOD AND DEVICE FOR SPREADING A COATING, IN PARTICULAR A ROAD COATING OF BITUMEN
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EP0466526A1 (en) * 1990-06-29 1992-01-15 Beugnet S.A. Bituminous binder for road surfacing and process for producing such a binder
WO1998035102A1 (en) * 1997-02-08 1998-08-13 Wirtgen Gmbh Device for paving roadways and device for producing foamed bitumen
FR2800104A1 (en) * 1999-10-22 2001-04-27 Secmair Process, for carrying out thin surfacing of road, includes spreading first layer of hot bitumen, laying thin layer of hot water followed by layer of hot bitumen and finally spreading layer of stones on top
WO2002066744A1 (en) * 2001-02-21 2002-08-29 Secmair Method and vehicle for pavement surface dressing
FR2849874A1 (en) * 2003-01-14 2004-07-16 Famatec Bitumen binder injection device for use in road work, has mixing chamber with annular insulation room defined between internal and external wall, and liquid injecting unit engaged to opening of mixing chamber
EP1439265A1 (en) * 2003-01-14 2004-07-21 Famatec Injection device of an apparatus for preparing and spraying a bituminous binder
EP2556194A2 (en) * 2010-04-06 2013-02-13 BOMAG GmbH Apparatus for producing foamed bitumen and process for servicing said apparatus
EP2556194B1 (en) * 2010-04-06 2015-08-19 BOMAG GmbH Apparatus for producing foamed bitumen and process for maintenance of said apparatus
ITMI20101108A1 (en) * 2010-06-18 2011-12-19 Bernardi Impianti Internat S P A EXPANDED BITUMEN GENERATOR AND EXPANDED BITUMEN GENERATION METHOD, PARTICULARLY FOR THE PRODUCTION OF COLD BITUMINOUS CONGLOMERATE
CN103711059A (en) * 2013-12-19 2014-04-09 福建南方路面机械有限公司 Asphalt foaming device

Also Published As

Publication number Publication date
PT87020B (en) 1995-05-31
ATE62033T1 (en) 1991-04-15
DE3862134D1 (en) 1991-05-02
ES2021845B3 (en) 1991-11-16
EP0283399B1 (en) 1991-03-27
PT87020A (en) 1989-03-30
FR2612533A1 (en) 1988-09-23
GR3001722T3 (en) 1992-11-23
FR2612533B1 (en) 1990-11-23

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