EP0418111A1 - Storage system for bituminous mixtures after changing the composition formula of these mixtures - Google Patents

Storage system for bituminous mixtures after changing the composition formula of these mixtures Download PDF

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Publication number
EP0418111A1
EP0418111A1 EP90402390A EP90402390A EP0418111A1 EP 0418111 A1 EP0418111 A1 EP 0418111A1 EP 90402390 A EP90402390 A EP 90402390A EP 90402390 A EP90402390 A EP 90402390A EP 0418111 A1 EP0418111 A1 EP 0418111A1
Authority
EP
European Patent Office
Prior art keywords
composition
materials
bitumen
hopper
formula
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90402390A
Other languages
German (de)
French (fr)
Inventor
Guy Marconnet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ermont CM
Original Assignee
Ermont CM
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ermont CM filed Critical Ermont CM
Publication of EP0418111A1 publication Critical patent/EP0418111A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1063—Controlling the operations
    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068—Supplying or proportioning the ingredients
    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow

Definitions

  • the invention relates to a method of storing bituminous coated materials, when the composition formula of these materials is changed.
  • Coated materials such as asphalt for road surfaces consist of aggregates such as pebbles coated with bitumen and containing a certain amount of fine-grained material.
  • coated materials are generally produced in mobile or fixed station coating plants and transported to the road construction site by dump trucks before being spread on the road during construction or repair and compacted by suitable machines.
  • the coating plants have a mixing device into which the aggregates are introduced and mixed with the bituminous binder.
  • this kneading device is constituted by a drying and coating drum performing both the drying and heating of the aggregates and fines and the hot kneading of these materials with liquid bitumen.
  • the coating dryer drum has a very long cylindrical envelope rotating around its axis and receiving at one of its ends the cold and wet aggregates which pass through the drum along its entire length to a second outlet end where the coated products in the drum are taken up by a conveyor such as a raclette conveyor.
  • the liquid bitumen is introduced into the drum by an injection lance, at an intermediate point between the ends of the drum.
  • the flow rate of liquid bitumen introduced by the lance is adjusted as a function of the weight flow rate of aggregates which is measured on a weighing conveyor forming part of the handling assembly bringing the cold and wet aggregates to the inlet end of the drum.
  • Bituminous coated materials produced continuously in the drum and taken up at the exit of the drum by a conveyor are poured at the exit of this conveyor into a receiving device constituted by an anti-segregation hopper or a chute.
  • the conveyor ensures its filling; the anti-segregation hopper is then placed in the open position so as to pour its contents into a loading means such as a hopper.
  • the loading hopper can ensure the successive filling of a set of storage hoppers.
  • the dump trucks for transporting asphalt mixes are placed successively under the storage hoppers, the controlled opening of which ensures the filling of the truck in the loading position under the hopper.
  • the mixes can be prepared, according to a certain number of composition formulas which differ by the composition of the aggregates, by the quantity and nature of the fine-grained materials or of other additives and by the proportion of bitumen added to these solid materials.
  • the launch in manufacturing of a mix composition formula is carried out from the cockpit of the coating plant by controlling the start of the various aggregates and powder dosers, in a sequential order defined by the arrangement of the various virgin material storage hoppers of the asphalt mixing plant.
  • This flow rate by weight is memorized so as to be able to deduce therefrom the necessary flow rate of liquid bitumen to be introduced at the injection point.
  • This injection point is generally far from the weighing table, so that, in order to adjust the injection of bitumen, the time difference corresponding to the transport time of the aggregates between the weighing table and the point d 'injection.
  • the stoppers of virgin materials are stopped, then with a certain time lag, the injection of the bitumen is stopped, the mixing of the aggregates and the bitumen then being continued for a sufficient time.
  • the coating stations comprising a coating dryer drum make it possible to successively manufacture aggregates comprising formulas of different composition.
  • composition change procedure which is generally designated by formula change on the fly, has certain drawbacks.
  • mixes of intermediate composition are generally sent to a silo receiving defective materials that are not accepted, called refuse silo.
  • the asphalt is directed to the refuse silo well before and well after the passage of the intermediate composition, which causes losses of asphalt.
  • the object of the invention is therefore to propose a method for storing bituminous coated materials, during a change in the composition formula of these coated materials, the manufacture of which by mixing solid materials and bitumen is provided continuously in an installation comprising a hot mixing device supplied with aggregates and liquid bitumen at an injection point, a set of means for storing the coated materials and a means of transfer and distribution materials coated in the various storage means, from the outlet of the kneading device, comprising a receiving device and a loading means into which the materials arriving at the receiving device are poured, the manufacture of coated materials having a new composition formula being triggered by supplying the kneading device with aggregates according to the new composition and by determining the instant T0 at which the aggregates according to the new composition reach the point of injection of bitumen and the bitumen flow rate to be incorporated into these aggregates , this process making it possible to avoid eliminating excessive amounts of coating s, when the change of the composition of formula and alter unacceptably coated composition incorporated in the normal production.
  • the travel time of the coated materials is determined between the injection point and the receiving device, - the quantity of coated materials supplied by the kneading device is determined, at the time of the change of composition, having an intermediate composition which differs significantly from the new composition and the instant at which the materials of intermediate composition reach the reception device , the materials of intermediate composition are evacuated using the loading means, as a function of the quantity of materials determined previously, and depending on the time at which the materials of intermediate composition reach the receiving device, - And the loading means containing the intermediate composition are emptied into one of the storage means predetermined as a function of the difference in composition between the composition during manufacture and the new composition.
  • FIG. 1 there is shown a coating installation comprising a drum-dryer-coating 1 continuously supplied with cold and wet aggregates by a weighing conveyor 2 at one of its longitudinal ends.
  • a burner 3 having an elongated body penetrates through the face of the drum opposite the inlet end of the aggregates 4.
  • the flame 5 of the burner develops in an intermediate zone of the drum constituting a combustion zone in which hot gases are formed which then circulate in the drum, in its longitudinal direction and in the direction of its end for introducing the aggregates, that is to say against the current with respect to the aggregates.
  • the envelope of the drying and coating drum 1 of generally cylindrical shape is rotatably mounted around its longitudinal axis which is slightly inclined relative to the horizontal plane, the inlet end of the aggregates being at a level higher than the opposite end of out of the drum.
  • This outlet end of the drum has a larger diameter than the inlet end.
  • the casing of the drum is internally lined with vanes ensuring a certain agitation or a certain lifting of the aggregates during their circulation in the drum.
  • a bitumen injection lance 6 is introduced through the outlet end of the drum opposite the inlet end of the aggregates 4.
  • the end of the lance 6 through which the bitumen injection is carried out leads to the inside the drum at an injection point 7 intermediate between the two ends of the drum.
  • the zone of the drum comprising the zone where the flame 5 develops and situated between the entry end of the drum and the bitumen injection point 7 constitutes a zone for drying and heating of the aggregates the inner wall of the drum is lined , in at least part of this zone, vanes ensuring the lifting and falling of the aggregates throughout the section of the drum, so that these aggregates are exposed to hot gases from the combustion zone.
  • the coating of the aggregates is ensured by kneading of these aggregates and of the liquid bitumen by vanes integral with the interior wall of the drum.
  • the bituminous coated products 8 produced in the drum are continuously discharged, at the outlet of the drum, in a scraper conveyor 10 ensuring the transport of the coated materials up to a level higher than the charge level of a battery 20 of hoppers of storage 22.
  • the coated materials 8 are poured out of the scraper conveyor 10 into an anti-segregation hopper 12 placed above the opening of a loading hopper 24.
  • the storage hoppers 22 of the battery 20 have upper ends situated substantially at the same level and carrying a raceway on which the loading hopper 24 is capable of moving.
  • the movable hopper 24 is a shuttle hopper which can move between a loading position located below the outlet end of the anti-segregation hopper 12 and a vertical position and above the upper loading opening d 'any storage hopper 22.
  • the shuttle hopper 24 could be mounted on an assembly of the overhead crane type making it possible to move it not only transversely but also in the longitudinal direction, to serve several successive rows of hoppers.
  • the shuttle hopper 24 is filled in the first position of this hopper at the vertical of the anti-segregation hopper 12 whose cyclic opening allows the discharge of the bituminous mix charge that it contains inside the shuttle hopper 24.
  • a shuttle hopper 24 is used whose capacity is at least twice the capacity of the anti-segregation hopper.
  • the loading shuttle hopper 24 is filled during one or more successive opening cycles of the anti-segregation hopper 12.
  • the loading shuttle hopper 24 is then placed vertically with a storage hopper 22 which is filled by emptying the hopper 24. Finally, the loading shuttle hopper 24 is replaced in the reloading position vertically from the anti-segregation hopper 12.
  • the adjustment of the speeds and flow rates is such that during the time necessary to carry out the outward and return movement of the shuttle hopper, the anti-segregation hopper fills at its nominal load Q0.
  • the transport trucks 25 for the coated materials produced by the installation are capable of coming into the loading position below any hopper 22.
  • the weighing conveyor 2 is continuously supplied with cold and wet aggregates by an assembly 16 comprising hoppers for storing aggregates of different particle size and / or pulverulent materials.
  • the conveyor 2 comprises a weighing table 17 whose position defines the position of the weighing point, in the direction of movement of the aggregates through the coating installation.
  • the weighing point 17 and the bitumen injection point 7 are relatively distant from each other, so that it is necessary to take into account the travel time T0 of the aggregates between the weighing point 17 and the bitumen injection point 7 to regulate the injection rate of the bituminous binder by the lance 6.
  • the lance 6 is connected to a pump 18 whose actual flow is compared to a binder flow calculated from the weight flow of cold and wet aggregates measured at the weighing point 17.
  • the dosage of the aggregates supplied by the set of hoppers 16 is modified, by adjusting, according to the new composition chosen, the different dosers hoppers of the set 16.
  • the calculated bituminous binder flow rate which is compared to the actual flow rate of the pump 18 takes into account a time difference equal to T0, the aggregates 4 according to the new composition 8a, the flow rate of which is measured at point 17 arriving at point d injection 7 at a time offset by T0 from the time when these aggregates arrive at the weighing point 17.
  • the bitumen injection point 7 is in a position which is substantially distant from the anti-segregation hopper 12 constituting the reception hopper by which the loading hopper 24 is filled.
  • the most specifies the time T1 separating the moment when the liquid bitumen is injected into the aggregates 4 according to the new formula 8a and the moment when the bituminous coated products produced from these aggregates are poured into the anti-segregation hopper 12.
  • This time corresponds to the sum of the travel time of the materials being coated, along the length of the mixing zone of the drum 1 and the transfer time of the bituminous mixes 8 by the scraper conveyor 10 between the outlet of the drum and the anti-segregation hopper.
  • the materials introduced into the drum have for a certain time an intermediate composition 8c between the new composition 8a and the composition 8b during manufacture, so that by injection of bitumen and mixing of these materials , coated materials 8c are produced, the composition of which is intermediate between the current composition and the new composition.
  • the instant at which the aggregates corresponding to the change in composition arrive at the injection point also corresponds to the instant at which one begins to incorporate the bitumen into the aggregates according to the intermediate composition 8c.
  • time T1 into a shift register makes it possible to determine, from this instant when the preparation of the materials of intermediate composition 8c begins, the moment at which these materials coated with intermediate composition arrive in the receiving hopper 12.
  • the quantity of coated materials 8c having an intermediate composition that is substantially different from the new composition 8a which has been launched is also determined as precisely as possible.
  • This value (in tonnes produced) is stored in relation to the time at which the materials of intermediate composition 8c arrive in the receiving hopper.
  • bituminous coated materials it is necessary to avoid the degradation of materials having a composition formula rich in bitumen by mixing with materials having a composition formula poor in bitumen.
  • fine-grained compositions correspond to formulas rich in bitumen which may be designated subsequently as “fine” formulas.
  • the formulas with a larger grain size are generally formulas poor in bitumen which may be designated subsequently by "coarse” formulas.
  • the new formula is polluted by the old low-bitumen formula, at the start of manufacture.
  • the mixes of intermediate composition must then be directed to the storage hopper of the old composition.
  • the new formula is a "large” formula and the current formula a "fine” formula, after the change of formula, the new formula is not polluted by the current formula rich in bitumen.
  • the mixes of intermediate composition must be directed to the storage hopper of the new formula.
  • the data relating to the composition of the formulas to be developed by the coating station are in entered in a priority table which makes it possible to compare the compositions of the successive formulas and to determine the storage destination of the intermediate composition.
  • the loading hopper 24 or shuttle hopper distributing the coated materials in the storage hoppers 22 has a capacity adapted to the throughput of the coating station. This capacity is more than double the capacity of the anti-segregation hopper, as indicated above.
  • the filling of the loading hopper 24 can therefore be carried out by one or more opening cycles of the anti-segregation hopper 12.
  • the anti-segregation hopper empties at regular intervals into the shuttle hopper.
  • the shuttle hopper provides transport and emptying of the load of mixes in a storage hopper and is replaced under the anti-segregation hopper, the filling of which was carried out during the outward and return movement of the shuttle hopper.
  • the shuttle hopper therefore carries a constant mix load equal to the nominal load Q0 of the anti-segregation hopper at each cycle.
  • the last shuttle hopper can be filled with a quantity of mixes of the composition in progress between Q0 and 2 Q0, i.e. between the nominal capacity of the anti-segregation hopper and twice this capacity, since the remaining quantity of mixes according to the composition in progress does not generally represent an exact multiple the capacity of the anti-segregation hopper.
  • the materials of intermediate composition are evacuated in a single operation the shuttle hopper contains both the mixes according to the intermediate composition and a certain amount of mixes according to the new composition to complete the charge at the value Q0.
  • the mixes of intermediate composition are also evacuated in a single operation, the shuttle hopper being filled to a level higher than the level Q0.
  • the priority table makes it possible to determine the storage hopper into which the loading hopper must be emptied containing materials of intermediate composition and possibly coated materials according to the new composition.
  • the emptying operation or operations of the shuttle hopper 24 are carried out in a storage hopper of the formula in progress 8b since the shuttle hopper contains either mixes of the new formula polluted by mixes of intermediate composition, or mixes of intermediate composition in which the new formula is polluted by the current formula.
  • the current formula 8b is a formula "end” and the new formula 8a a "large” formula
  • the content of the loading hopper 24 is poured into a storage hopper of the new composition 8a, since the shuttle hopper contains either mixes of the new composition which are not not polluted by mixes of intermediate composition or mixes of intermediate composition comprising a mixture of the two formulas.
  • FIG. 2 there is shown an alternative embodiment of a coating installation in which the method according to the invention is implemented.
  • the corresponding elements in FIGS. 1 and 2 bear the same references, with however the exhibitor (premium) as regards the elements of the installation shown in FIG. 2.
  • the installation represented in FIG. 2 comprises a drum-dryer-coating 1 ′ with parallel currents, in which the hot gases produced by the flame 5 ′ of the burner 3 ′ circulate in the same direction as the solid matter constituted by the aggregates 4 ′.
  • the drum 1 ′ has a generally cylindrical shape and its envelope is internally lined with aggregate lifting vanes.
  • a bitumen injection lance 6 ′ is introduced through the outlet end of the drum.
  • the end of the lance 6 ′ through which the injection of the bitumen is carried out opens out inside the drum at a point 7 ′ intermediate between the two ends of the drum.
  • the drum has a flame zone in which the flame 5 ′ of the burner develops and a drying zone extending after the flame zone (with enlarged diameter) to the point of injection of bitumen 7 ′.
  • the aggregates are coated by mixing these aggregates and the liquid bitumen.
  • the bituminous coated products 8 ′ produced in the drum are discharged continuously, at the exit of the drum in a squeegee conveyor 10 ′ ensuring the transport of the materials 8 ′ to a level higher than the level of charging of a battery 20 ′ 22 ′ storage hoppers.
  • the coated materials 8 ′ are poured out of the scraper conveyor 10 ′, into a chute 29 placed above a loading device 30.
  • the loading device 30 comprises a central chute 31 and two lateral conveyors 32 and 32 ′ of transverse direction.
  • the device 30 is mounted movable, by means of rollers, on a raceway situated above the upper level of the hoppers 22 ′.
  • the device 30 can be placed either in its position shown in FIG. 2, in which the chute 29 is located vertically from the central chute 31, or in a position shifted to the right or to the left, in which the chute 29 is vertical to the entrance of the conveyor 32 or the conveyor 32 ′ respectively.
  • the transport trucks 25 ′ come in the loading position below the various hoppers 22 ′ of the battery 20 ′.
  • the weighing conveyor 2 ′ is continuously supplied with cold and wet aggregates by a 16 ′ assembly comprising hoppers for storing aggregates of different particle sizes and / or pulverulent materials.
  • the conveyor 2 ′ has a weighing table 17 ′.
  • bitumen flow injected by the lance 6 ′ is adjusted by means of the pump 18 ′ in the same manner as in the case of the device shown in FIG. 1.
  • the fringe of intermediate composition 8′c is evacuated, thanks to the device 30 , towards a hopper 22 'predetermined according to the succession of manufacturing.
  • the travel time and the quantity of materials of intermediate composition 8′c are taken into consideration, as before.
  • the invention can be used in the context of a coating plant of a type different from those which have been described, insofar as this coating plant comprises a continuous mixing device, several storage hoppers, a means for selective loading of the storage hoppers and a device for transferring bituminous mixes between the output of the mixing device and the loading means.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)

Abstract

The coated materials (8) are prepared by mixing solid materials and bitumen in an installation comprising a hot kneader-mixer (1), a set of means (20) for storing the coated materials and a means (10, 12, 24) for transferring and distributing the coated materials (8) into the various storage means (22). The travel time (T1) of the coated materials (8) between the bitumen-injection point (7) and the receiving hopper (12) is determined, the quantity of coated materials (8) of intermediate composition supplied by the kneader-mixer is determined, at the moment of composition change and the instant when the intermediate composition materials arrive in the receiving hopper (12), a loading means (24) is filled as a function of the quantity determined at the desired instant and the loading means (24) emptied into a storage means (22) predetermined as a function of the composition change. <IMAGE>

Description

L'invention concerne un procédé de stockage de matériaux enrobés bitumineux, lors d'un changement de la formule de composition de ces matériaux.The invention relates to a method of storing bituminous coated materials, when the composition formula of these materials is changed.

Les matériaux enrobés tels que les enrobés pour revêtement routier sont constitués par des agrégats tels que des cailloux revêtus de bitume et renfermant une certaine quantité de matière à fine granulométrie.Coated materials such as asphalt for road surfaces consist of aggregates such as pebbles coated with bitumen and containing a certain amount of fine-grained material.

Ces matériaux enrobés sont généralement pro­duits dans des centrales d'enrobage mobiles ou à poste fixe et transportés sur le chantier routier par des camions-bennes avant d'être répandus sur la route en cours de construction ou de réfection et compactés par des engins appropriés.These coated materials are generally produced in mobile or fixed station coating plants and transported to the road construction site by dump trucks before being spread on the road during construction or repair and compacted by suitable machines.

Les centrales d'enrobage comportent un dispo­sitif de malaxage dans lequel les agrégats sont intro­duits et mélangés avec le liant bitumineux. De manière courante, ce dispositif de malaxage est constitué par un tambour sécheur et enrobeur réalisant à la fois le sé­chage et le chauffage des agrégats et des fines et le malaxage à chaud de ces matériaux avec du bitume liqui­de.The coating plants have a mixing device into which the aggregates are introduced and mixed with the bituminous binder. Commonly, this kneading device is constituted by a drying and coating drum performing both the drying and heating of the aggregates and fines and the hot kneading of these materials with liquid bitumen.

Le tambour sécheur enrobeur comporte une enveloppe cylindrique de grande longueur tournant autour de son axe et recevant par l'une de ses extrémités les agrégats froids et humides qui traversent le tambour suivant toute sa longueur jusqu'à une seconde extrémité de sortie où les enrobés produits dans le tambour sont repris par un transporteur tel qu'un convoyeur à raclet­tes.The coating dryer drum has a very long cylindrical envelope rotating around its axis and receiving at one of its ends the cold and wet aggregates which pass through the drum along its entire length to a second outlet end where the coated products in the drum are taken up by a conveyor such as a raclette conveyor.

Le bitume liquide est introduit dans le tam­bour par une lance d'injection, en un point intermédiai­re entre les extrémités du tambour.The liquid bitumen is introduced into the drum by an injection lance, at an intermediate point between the ends of the drum.

Le débit de bitume liquide introduit par la lance est réglé en fonction du débit pondéral d'agrégats qui est mesuré sur un convoyeur peseur faisant partie de l'ensemble de manutention amenant les agrégats froids et humides à l'extrémité d'entrée du tambour.The flow rate of liquid bitumen introduced by the lance is adjusted as a function of the weight flow rate of aggregates which is measured on a weighing conveyor forming part of the handling assembly bringing the cold and wet aggregates to the inlet end of the drum.

Les matériaux enrobés bitumineux produits en continu dans le tambour et repris à la sortie du tambour par un convoyeur se déversent à la sortie de ce convoyeur dans un dispositif de réception constitué par une trémie antiségrégation ou une goulotte.Bituminous coated materials produced continuously in the drum and taken up at the exit of the drum by a conveyor are poured at the exit of this conveyor into a receiving device constituted by an anti-segregation hopper or a chute.

Lorsque la trémie antiségrégation est fermée, le convoyeur assure son remplissage ; la trémie antisé­grégation est ensuite placée en position d'ouverture de manière à déverser son contenu dans un moyen de charge­ment tel qu'une trémie.When the anti-segregation hopper is closed, the conveyor ensures its filling; the anti-segregation hopper is then placed in the open position so as to pour its contents into a loading means such as a hopper.

La trémie de chargement peut assurer le rem­plissage successif d'un ensemble de trémies de stockage.The loading hopper can ensure the successive filling of a set of storage hoppers.

Les camions-bennes de transport des enrobés viennent se placer successivement sous les trémies de stockage dont l'ouverture contrôlée assure le remplis­sage du camion en position de chargement sous la trémie.The dump trucks for transporting asphalt mixes are placed successively under the storage hoppers, the controlled opening of which ensures the filling of the truck in the loading position under the hopper.

Les enrobés peuvent être élaborés, suivant un certain nombre de formules de composition qui diffèrent par la composition des agrégats, par la quantité et la nature des matières à fine granulométrie ou d'autres additifs et par la proportion de bitume ajoutée à ces matériaux solides.The mixes can be prepared, according to a certain number of composition formulas which differ by the composition of the aggregates, by the quantity and nature of the fine-grained materials or of other additives and by the proportion of bitumen added to these solid materials.

Le lancement en fabrication d'une formule de composition d'enrobés est réalisé depuis le poste de conduite de la centrale d'enrobage en commandant le démarrage des différents doseurs d'agrégats et de pulvé­rulents, suivant un ordre séquentiel défini par la disposition des différentes trémies de stockage des matériaux vierges de la centrale d'enrobage.The launch in manufacturing of a mix composition formula is carried out from the cockpit of the coating plant by controlling the start of the various aggregates and powder dosers, in a sequential order defined by the arrangement of the various virgin material storage hoppers of the asphalt mixing plant.

Ces matériaux dosés suivant une certaine composition passent sur la table de pesage du convoyeur peseur, ce qui permet de déterminer, à un instant quel­ conque, le débit pondéral de matériaux vierges transpor­tés par le convoyeur.These materials dosed according to a certain composition pass on the weighing table of the weighing conveyor, which makes it possible to determine, at an instant which conch, the weight flow of virgin materials transported by the conveyor.

Ce débit pondéral est mémorisé de manière à pouvoir en déduire le débit nécessaire de bitume liquide à introduire au point d'injection. Ce point d'injection est généralement éloigné de la table de pesage, si bien qu'on doit tenir compte, pour régler l'injection de bitume, du décalage temporel correspondant au temps de transport des agrégats entre la table de pesage et le point d'injection.This flow rate by weight is memorized so as to be able to deduce therefrom the necessary flow rate of liquid bitumen to be introduced at the injection point. This injection point is generally far from the weighing table, so that, in order to adjust the injection of bitumen, the time difference corresponding to the transport time of the aggregates between the weighing table and the point d 'injection.

Lorsque les matériaux vierges dont le débit a été mesuré sur la table de pesage parviennent au point d'injection, on incorpore à ces agrégats du bitume li­quide d'une qualité donnée avec un débit déterminé.When the virgin materials whose flow rate has been measured on the weighing table reach the injection point, liquid bitumen of a given quality is incorporated into these aggregates with a determined flow rate.

Après cette phase de démarrage, la fabrication se poursuit de façon continue avec d'éventuels change­ments de régime, jusqu'à l'arrêt de la production deman­dé par l'opérateur.After this start-up phase, the production continues continuously with possible regime changes, until the stop of production requested by the operator.

On commande pour cela l'arrêt des doseurs de matériaux vierges, puis avec un certain décalage dans le temps l'arrêt de l'injection du bitume, le brassage des agrégats et du bitume étant ensuite poursuivi pendant un temps suffisant.To do this, the stoppers of virgin materials are stopped, then with a certain time lag, the injection of the bitumen is stopped, the mixing of the aggregates and the bitumen then being continued for a sufficient time.

Les postes d'enrobage comportant un tambour sécheur enrobeur permettent de fabriquer successivement des agrégats comportant des formules de composition différentes.The coating stations comprising a coating dryer drum make it possible to successively manufacture aggregates comprising formulas of different composition.

En utilisant des moyens de commande automati­ques comportant des calculateurs numériques, il est possible d'élaborer successivement des enrobés de compo­sitions différentes sans interruption de la circulation des matériaux et sans arrêt de l'installation.By using automatic control means comprising digital computers, it is possible to successively prepare mixes of different compositions without interrupting the circulation of materials and without stopping the installation.

Une telle procédure de changement de composi­tion qui est généralement désignée par changement de formule à la volée présente certains inconvénients.Such a composition change procedure, which is generally designated by formula change on the fly, has certain drawbacks.

Les enrobés étant élaborés en continu dans le tambour sécheur enrobeur, il se produit un mélange des matériaux suivant la formule en cours de fabrication et suivant la nouvelle composition, au moment du changement de formule.Since the asphalt mixes are produced continuously in the coating dryer drum, a mixture of materials is produced according to the formula during manufacture and according to the new composition, at the time of the change of formula.

Il en résulte une production d'une certaine quantité de matériaux enrobés dont la composition n'ap­partient complètement ni à la formule en cours ni à la nouvelle formule.This results in the production of a certain quantity of coated materials, the composition of which does not completely belong to either the current formula or the new formula.

D'autre part, les moyens de transport et de stockage d'enrobés utilisés actuellement ne permettent plus d'avoir un contrôle visuel direct sur les enrobés et donc de déterminer par observation directe les plages de séparation des formules de composition.On the other hand, the means of transport and storage of asphalt mixes currently used no longer make it possible to have direct visual control over the asphalt mixtures and therefore to determine by direct observation the ranges of separation of the composition formulas.

Enfin, les dispositifs de contrôle automatique des postes d'enrobage qui utilisent des calculateurs ne prévoient pas jusqu'ici un contrôle de la circulation des matériaux après le point d'injection du bitume.Finally, the devices for automatic control of the coating stations which use computers have not so far provided for a control of the circulation of materials after the point of injection of the bitumen.

Il n'est donc pas possible de maîtriser par­faitement le déplacement des matériaux enrobés de compo­sition intermédiaire correspondant au mélange des deux formules de composition de l'enrobé.It is therefore not possible to perfectly control the movement of coated materials of intermediate composition corresponding to the mixture of the two composition formulas of the coated.

Pour limiter les risques de mélange d'enrobés de compositions différentes dans les trémies de stocka­ge, les enrobés de composition intermédiaire sont géné­ralement dirigés vers un silo recevant les matériaux défectueux non acceptés, appelé silo de refus.To limit the risks of mixing of mixtures of different compositions in the storage hoppers, mixes of intermediate composition are generally sent to a silo receiving defective materials that are not accepted, called refuse silo.

Par précaution, on dirige les enrobés vers le silo de refus bien avant et bien après le passage de la composition intermédiaire, ce qui occasionne des pertes d'enrobés.As a precaution, the asphalt is directed to the refuse silo well before and well after the passage of the intermediate composition, which causes losses of asphalt.

Le but de l'invention est donc de proposer un procédé de stockage de matériaux enrobés bitumineux, lors d'un changement de la formule de composition de ces matériaux enrobés dont la fabrication par mélange de matériaux solides et de bitume est assurée en continu dans une installation comportant un dispositif de mala­xage à chaud alimenté en agrégats et en bitume liquide en un point d'injection, un ensemble de moyens de sto­ckage des matériaux enrobés et un moyen de transfert et de distribution des matériaux enrobés dans les diffé­rents moyens de stockage, à partir de la sortie du dispositif de malaxage, comportant un dispositif de réception et un moyen de chargement dans lequel se déversent les matériaux parvenant au dispositif de réception, la fabrication d'enrobés ayant une nouvelle formule de composition étant déclenchée par alimentation du dispositif de malaxage en agrégats suivant la nouvel­le composition et par détermination de l'instant T0 auquel les agrégats suivant la nouvelle composition parviennent au point d'injection de bitume et du débit de bitume à incorporer à ces agrégats, ce procédé per­mettant d'éviter d'éliminer des quantités excessives d'enrobés, au moment du changement de la formule de composition et d'altérer de manière inacceptable la composition des enrobés incorporés dans la production normale.The object of the invention is therefore to propose a method for storing bituminous coated materials, during a change in the composition formula of these coated materials, the manufacture of which by mixing solid materials and bitumen is provided continuously in an installation comprising a hot mixing device supplied with aggregates and liquid bitumen at an injection point, a set of means for storing the coated materials and a means of transfer and distribution materials coated in the various storage means, from the outlet of the kneading device, comprising a receiving device and a loading means into which the materials arriving at the receiving device are poured, the manufacture of coated materials having a new composition formula being triggered by supplying the kneading device with aggregates according to the new composition and by determining the instant T0 at which the aggregates according to the new composition reach the point of injection of bitumen and the bitumen flow rate to be incorporated into these aggregates , this process making it possible to avoid eliminating excessive amounts of coating s, when the change of the composition of formula and alter unacceptably coated composition incorporated in the normal production.

Dans ce but :
- on détermine le temps de parcours des matériaux enro­bés entre le point d'injection et le dispositif de réception,
- on détermine la quantité de matériaux enrobés fournie par le dispositif de malaxage, au moment du changement de composition, ayant une composition intermédiaire qui diffère de manière sensible de la nouvelle composition et l'instant auquel les matériaux de composition inter­médiaire parviennent au dispositif de réception,
- on réalise l'évacuation des matériaux de composition intermédiaire grâce au moyen de chargement, en fonction de la quantité de matériaux déterminée précédemment et en fonction de l'instant auquel les matériaux de compo­sition intermédiaire parviennent au dispositif de récep­tion,
- et on vide le moyen de chargement contenant la compo­sition intermédiaire dans l'un des moyens de stockage prédéterminé en fonction de la différence de composition entre la composition en cours de fabrication et la nouvelle composition.For this reason :
the travel time of the coated materials is determined between the injection point and the receiving device,
- the quantity of coated materials supplied by the kneading device is determined, at the time of the change of composition, having an intermediate composition which differs significantly from the new composition and the instant at which the materials of intermediate composition reach the reception device ,
the materials of intermediate composition are evacuated using the loading means, as a function of the quantity of materials determined previously, and depending on the time at which the materials of intermediate composition reach the receiving device,
- And the loading means containing the intermediate composition are emptied into one of the storage means predetermined as a function of the difference in composition between the composition during manufacture and the new composition.

Afin de bien faire comprendre l'invention, on va maintenant décrire, à titre d'exemple non limitatif, en se référant aux figures jointes en annexe, la mise en oeuvre du procédé suivant l'invention, dans le cas d'une installation d'enrobage comportant un tambour sécheur enrobeur dans lequel est effectué le malaxage des agré­gats et du bitume liquide.

  • La figure 1 est une vue en élévation et en coupe d'une installation d'enrobage comportant un tam­bour-sécheur-enrobeur à circulation à contre-courant et une batterie de trémies de stockage alimentées par une trémie de chargement mobile.
  • La figure 2 est une vue en élévation et en coupe d'une installation d'enrobage comportant un tam­bour-sécheur-enrobeur à circulation à courants parallè­les et une batterie de trémies de stockage alimentées par un convoyeur-distributeur mobile.
In order to clearly understand the invention, a description will now be given, by way of nonlimiting example, with reference to the attached figures, of the implementation of the method according to the invention, in the case of an installation of coating comprising a coating drying drum in which the mixing of the aggregates and the liquid bitumen is carried out.
  • FIG. 1 is a view in elevation and in section of a coating installation comprising a drum-dryer-enrober with counter-current circulation and a battery of storage hoppers supplied by a mobile loading hopper.
  • Figure 2 is an elevational and sectional view of a coating installation comprising a drum-dryer-enrober with parallel current circulation and a battery of storage hoppers supplied by a mobile conveyor-distributor.

Sur la figure 1, on a représenté une installa­tion d'enrobage comportant un tambour-sécheur-enrobeur 1 alimenté en continu en agrégats froids et humides par un convoyeur peseur 2 à l'une de ses extrémités longitudi­nales.In Figure 1, there is shown a coating installation comprising a drum-dryer-coating 1 continuously supplied with cold and wet aggregates by a weighing conveyor 2 at one of its longitudinal ends.

Un brûleur 3 ayant un corps allongé pénètre par la face du tambour opposée à l'extrémité d'entrée des agrégats 4. La flamme 5 du brûleur se développe dans une zone intermédiaire du tambour constituant une zone de combustion dans laquelle sont formés des gaz chauds qui circulent ensuite dans le tambour, suivant sa direc­tion longitudinale et en direction de son extrémité d'introduction des agrégats, c'est-à-dire à contre-­courant par rapport aux agrégats.A burner 3 having an elongated body penetrates through the face of the drum opposite the inlet end of the aggregates 4. The flame 5 of the burner develops in an intermediate zone of the drum constituting a combustion zone in which hot gases are formed which then circulate in the drum, in its longitudinal direction and in the direction of its end for introducing the aggregates, that is to say against the current with respect to the aggregates.

L'enveloppe du tambour sécheur et enrobeur 1 de forme générale cylindrique est montée rotative autour de son axe longitudinal qui est légèrement incliné par rapport au plan horizontal, l'extrémité d'entrée des agrégats étant à un niveau supérieur à l'extrémité oppo­sée de sortie du tambour. Cette extrémité de sortie du tambour présente un diamètre plus important que l'extré­mité d'entrée.The envelope of the drying and coating drum 1 of generally cylindrical shape is rotatably mounted around its longitudinal axis which is slightly inclined relative to the horizontal plane, the inlet end of the aggregates being at a level higher than the opposite end of out of the drum. This outlet end of the drum has a larger diameter than the inlet end.

L'enveloppe du tambour est garnie intérieure­ment par des aubes assurant une certaine agitation ou un certain relevage des agrégats pendant leur circulation dans le tambour.The casing of the drum is internally lined with vanes ensuring a certain agitation or a certain lifting of the aggregates during their circulation in the drum.

Une lance d'injection de bitume 6 est intro­duite par l'extrémité de sortie du tambour opposée à l'extrémité d'entrée des agrégats 4. L'extrémité de la lance 6 par laquelle est effectuée l'injection de bitume débouche à l'intérieur du tambour en un point d'injec­tion 7 intermédiaire entre les deux extrémités du tam­bour.A bitumen injection lance 6 is introduced through the outlet end of the drum opposite the inlet end of the aggregates 4. The end of the lance 6 through which the bitumen injection is carried out leads to the inside the drum at an injection point 7 intermediate between the two ends of the drum.

La zone du tambour comportant la zone où se développe la flamme 5 et située entre l'extrémité d'en­trée du tambour et le point d'injection de bitume 7 constitue une zone de séchage et de chauffage des agré­gats la paroi intérieure du tambour est garnie, dans une partie au moins de cette zone, d'aubes assurant le relevage et la retombée des agrégats dans toute la section du tambour, de manière que ces agrégats soient exposés aux gaz chauds provenant de la zone de combus­tion.The zone of the drum comprising the zone where the flame 5 develops and situated between the entry end of the drum and the bitumen injection point 7 constitutes a zone for drying and heating of the aggregates the inner wall of the drum is lined , in at least part of this zone, vanes ensuring the lifting and falling of the aggregates throughout the section of the drum, so that these aggregates are exposed to hot gases from the combustion zone.

Dans la zone terminale du tambour située autour du corps du brûleur 3, entre le point d'injection 7 du bitume et l'extrémité du tambour opposée à l'extré­mité d'introduction des agrégats, l'enrobage des agré­gats est assuré par malaxage de ces agrégats et du bitume liquide par des aubes solidaires de la paroi intérieure du tambour.In the end zone of the drum located around the burner body 3, between the injection point 7 of the bitumen and the end of the drum opposite the end of introduction of the aggregates, the coating of the aggregates is ensured by kneading of these aggregates and of the liquid bitumen by vanes integral with the interior wall of the drum.

Les produits enrobés bitumineux 8 élaborés dans le tambour se déversent en continu, à la sortie du tambour, dans un convoyeur à raclettes 10 assurant le transport des matériaux enrobés jusqu'à un niveau supé­rieur au niveau de chargement d'une batterie 20 de trémies de stockage 22. Les matériaux enrobés 8 se déversent à la sortie du convoyeur à raclettes 10 dans une trémie antiségrégation 12 placée au-dessus de l'ou­verture d'une trémie de chargement 24.The bituminous coated products 8 produced in the drum are continuously discharged, at the outlet of the drum, in a scraper conveyor 10 ensuring the transport of the coated materials up to a level higher than the charge level of a battery 20 of hoppers of storage 22. The coated materials 8 are poured out of the scraper conveyor 10 into an anti-segregation hopper 12 placed above the opening of a loading hopper 24.

Les trémies de stockage 22 de la batterie 20 comportent des extrémités supérieures situées sensible­ment à un même niveau et portant un chemin de roulement sur lequel la trémie de chargement 24 est susceptible de se déplacer.The storage hoppers 22 of the battery 20 have upper ends situated substantially at the same level and carrying a raceway on which the loading hopper 24 is capable of moving.

La trémie mobile 24 est une trémie navette qui peut se déplacer entre une position de chargement située en-dessous de l'extrémité de sortie de la trémie antisé­grégation 12 et une position à la verticale et au-dessus de l'ouverture de chargement supérieure d'une trémie de stockage 22 quelconque.The movable hopper 24 is a shuttle hopper which can move between a loading position located below the outlet end of the anti-segregation hopper 12 and a vertical position and above the upper loading opening d 'any storage hopper 22.

On peut ainsi réaliser le chargement successif des trois trémies 22 disposées suivant une rangée trans­versale. Il est bien évident également que la trémie navette 24 pourrait être montée sur un ensemble du type pont roulant permettant de la déplacer non seulement transversalement mais également dans la direction longi­tudinale, pour desservir plusieurs rangées successives de trémies.It is thus possible to carry out the successive loading of the three hoppers 22 arranged in a transverse row. It is also obvious that the shuttle hopper 24 could be mounted on an assembly of the overhead crane type making it possible to move it not only transversely but also in the longitudinal direction, to serve several successive rows of hoppers.

Le remplissage de la trémie navette 24 est réalisé dans la première position de cette trémie à la verticale de la trémie antiségrégation 12 dont l'ouver­ture cyclique permet la vidange de la charge d'enrobés bitumineux qu elle contient à l'intérieur de la trémie navette 24. Pour la mise en oeuvre de l'invention, on utilise une trémie navette 24 dont la capacité est au moins égale au double de la capacité de la trémie anti­ségrégation. Le remplissage de la trémie navette de chargement 24 est assuré au cours d'un ou plusieurs cycles d'ouverture successifs de la trémie antiségréga­tion 12.The shuttle hopper 24 is filled in the first position of this hopper at the vertical of the anti-segregation hopper 12 whose cyclic opening allows the discharge of the bituminous mix charge that it contains inside the shuttle hopper 24. For the implementation of the invention, a shuttle hopper 24 is used whose capacity is at least twice the capacity of the anti-segregation hopper. The loading shuttle hopper 24 is filled during one or more successive opening cycles of the anti-segregation hopper 12.

La trémie navette de chargement 24 est ensuite placée à la verticale d'une trémie de stockage 22 dont on assure le remplissage par vidange de la trémie 24. Enfin, la trémie navette de chargement 24 est replacée en position de rechargement à la verticale de la trémie antiségrégation 12.The loading shuttle hopper 24 is then placed vertically with a storage hopper 22 which is filled by emptying the hopper 24. Finally, the loading shuttle hopper 24 is replaced in the reloading position vertically from the anti-segregation hopper 12.

Le réglage des vitesses et débits est tel que pendant le temps nécessaire pour effectuer le déplace­ment aller et retour de la trémie navette, la trémie antiségrégation se remplit à sa charge nominale Q0.The adjustment of the speeds and flow rates is such that during the time necessary to carry out the outward and return movement of the shuttle hopper, the anti-segregation hopper fills at its nominal load Q0.

Les camions de transport 25 des matériaux enrobés élaborés par l'installation sont susceptibles de venir en position de chargement en-dessous d'une trémie 22 quelconque.The transport trucks 25 for the coated materials produced by the installation are capable of coming into the loading position below any hopper 22.

Le convoyeur peseur 2 est alimenté en continu en agrégats froids et humides par un ensemble 16 compor­tant des trémies de stockage d'agrégats de différentes granulométrie et/ou de matériaux pulvérulents.The weighing conveyor 2 is continuously supplied with cold and wet aggregates by an assembly 16 comprising hoppers for storing aggregates of different particle size and / or pulverulent materials.

Le convoyeur 2 comporte une table de pesage 17 dont la position définit la position du point de pesée, suivant la direction de déplacement des agrégats tra­vers l'installation d'enrobage. Le point de pesée 17 et le point d'injection de bitume 7 sont relativement éloi­gnés l'un de l'autre, si bien qu'il est nécessaire de prendre en compte le temps de parcours T0 des agrégats entre le point de pesée 17 et le point d'injection de bitume 7 pour régler le débit d'injection du liant bitu­mineux par la lance 6. La lance 6 est reliée à une pompe 18 dont le débit réel est comparé à un débit de liant calculé à partir du débit pondéral d'agrégats froids et humides mesuré au point de pesée 17.The conveyor 2 comprises a weighing table 17 whose position defines the position of the weighing point, in the direction of movement of the aggregates through the coating installation. The weighing point 17 and the bitumen injection point 7 are relatively distant from each other, so that it is necessary to take into account the travel time T0 of the aggregates between the weighing point 17 and the bitumen injection point 7 to regulate the injection rate of the bituminous binder by the lance 6. The lance 6 is connected to a pump 18 whose actual flow is compared to a binder flow calculated from the weight flow of cold and wet aggregates measured at the weighing point 17.

Au moment du lancement d'un changement de composition suivant une procédure de changement de formule à la volée, on modifie le dosage des agrégats fournis par l'ensemble de trémies 16, en réglant, en fonction de la nouvelle composition choisie, les diffé­rents doseurs des trémies de l'ensemble 16.When launching a change of composition according to a procedure for changing the formula on the fly, the dosage of the aggregates supplied by the set of hoppers 16 is modified, by adjusting, according to the new composition chosen, the different dosers hoppers of the set 16.

On désignera par la suite par les repères 8a, 8b et 8c, les enrobés correspondant respectivement à une nouvelle formule de composition, à la formule de compo­sition en cours de fabrication ou à une formule intermé­diaire ou encore les formules de compositions correspon­dantes de ces enrobésThe following will be designated by the references 8a, 8b and 8c, the mixes corresponding respectively to a new composition formula, to the composition formula during manufacture or to an intermediate formula or else the corresponding composition formulas of these mixes

On détermine l'instant auquel les agrégats suivant la nouvelle composition 8a parviennent au point de pesage 17.The instant at which the aggregates according to the new composition 8a arrive at the weighing point 17 is determined.

Le débit de liant bitumineux calculé qui est comparé au débit réel de la pompe 18 tient compte d'un décalage dans le temps égal à T0, les agrégats 4 selon la nouvelle composition 8a dont le débit est mesuré au point 17 parvenant au point d'injection 7 à un instant décalé de T0 par rapport à l'instant où ces agrégats parviennent au point de pesage 17.The calculated bituminous binder flow rate which is compared to the actual flow rate of the pump 18 takes into account a time difference equal to T0, the aggregates 4 according to the new composition 8a, the flow rate of which is measured at point 17 arriving at point d injection 7 at a time offset by T0 from the time when these aggregates arrive at the weighing point 17.

Le point d'injection du bitume 7 se trouve dans une position sensiblement éloignée de la trémie antiségrégation 12 constituant la trémie de réception par laquelle est effectué le remplissage de la trémie de chargement 24.The bitumen injection point 7 is in a position which is substantially distant from the anti-segregation hopper 12 constituting the reception hopper by which the loading hopper 24 is filled.

Pour la mise en oeuvre du procédé de mesure suivant l'invention, on détermine de la manière la plus précise possible le temps T1 séparant le moment où le bitume liquide est injecté dans les agrégats 4 selon la nouvelle formule 8a et le moment où les produits enrobés bitumineux élaborés à partir de ces agrégats sont déver­sés dans la trémie antiségrégation 12. Ce temps corres­pond à la somme du temps de parcours des matériaux en cours d'enrobage, suivant la longueur de la zone de malaxage du tambour 1 et du temps de transfert des enro­bés bitumineux 8 par le convoyeur à raclettes 10 entre la sortie du tambour et la trémie antiségrégation.For the implementation of the measurement method according to the invention, the most specifies the time T1 separating the moment when the liquid bitumen is injected into the aggregates 4 according to the new formula 8a and the moment when the bituminous coated products produced from these aggregates are poured into the anti-segregation hopper 12. This time corresponds to the sum of the travel time of the materials being coated, along the length of the mixing zone of the drum 1 and the transfer time of the bituminous mixes 8 by the scraper conveyor 10 between the outlet of the drum and the anti-segregation hopper.

Au moment d'un changement de composition, les matériaux introduits dans le tambour présentent pendant un certain temps une composition intermédiaire 8c entre la nouvelle composition 8a et la composition 8b en cours de fabrication, si bien que par injection de bitume et malaxage de ces matériaux, on produit des enrobés 8c dont la composition est intermédiaire entre la composi­tion en cours et la nouvelle composition. L'instant auquel les agrégats correspondant au changement de composition parviennent au point d'injection correspond également à l'instant auquel on commence à incorporer le bitume aux agrégats suivant la composition intermédiaire 8c.At the time of a change of composition, the materials introduced into the drum have for a certain time an intermediate composition 8c between the new composition 8a and the composition 8b during manufacture, so that by injection of bitumen and mixing of these materials , coated materials 8c are produced, the composition of which is intermediate between the current composition and the new composition. The instant at which the aggregates corresponding to the change in composition arrive at the injection point also corresponds to the instant at which one begins to incorporate the bitumen into the aggregates according to the intermediate composition 8c.

L'introduction du temps T1 dans un registre à décalage permet de déterminer, à partir de cet instant où commence l'élaboration des matériaux de composition intermédiaire 8c, l'instant auquel ces matériaux enrobés de composition intermédiaire parviennent dans la trémie de réception 12.The introduction of time T1 into a shift register makes it possible to determine, from this instant when the preparation of the materials of intermediate composition 8c begins, the moment at which these materials coated with intermediate composition arrive in the receiving hopper 12.

En fonction du changement de composition, on détermine également, de la manière la plus précise possible, la quantité de matériaux enrobés 8c ayant une composition intermédiaire sensiblement différente de la nouvelle composition 8a dont on a effectué le lancement.Depending on the change in composition, the quantity of coated materials 8c having an intermediate composition that is substantially different from the new composition 8a which has been launched is also determined as precisely as possible.

Cette valeur (en tonnes produites) est mémori­sée en relation avec l'instant auquel les matériaux de composition intermédiaire 8c parviennent dans la trémie de réception.This value (in tonnes produced) is stored in relation to the time at which the materials of intermediate composition 8c arrive in the receiving hopper.

Ceci permet de programmer la vidange de la trémie de réception 12 dans la trémie de chargement 24, de manière à réaliser lévacuation et le stockage des enrobés dans une trémie de stockage voulue, au moment du changement de composition, selon la procédure qui sera indiquée ci-après.This makes it possible to program the emptying of the receiving hopper 12 into the loading hopper 24, so as to carry out the evacuation and storage of the mixes in a desired storage hopper, at the time of the change of composition, according to the procedure which will be indicated below. -after.

Au cours de la fabrication de matériaux enro­bés bitumineux, il est nécessaire d'éviter la dégrada­tion de matériaux présentant une formule de composition riche en bitume par mélange avec des matériaux présen­tant une formule de composition pauvre en bitume. Géné­ralement, les compositions à fine granulométrie corres­pondent à des formules riches en bitume qui pourront être désignées par la suite comme formules "fin". Les formules à granulométrie plus importante sont générale­ment des formules pauvres en bitume qui pourront être désignées par la suite par formules "gros".During the manufacture of bituminous coated materials, it is necessary to avoid the degradation of materials having a composition formula rich in bitumen by mixing with materials having a composition formula poor in bitumen. Generally, fine-grained compositions correspond to formulas rich in bitumen which may be designated subsequently as "fine" formulas. The formulas with a larger grain size are generally formulas poor in bitumen which may be designated subsequently by "coarse" formulas.

Dans le cas où la nouvelle formule est une formule "fin" et la formule en cours une formule "gros", la nouvelle formule est polluée par l'ancienne formule pauvre en bitume, en début de fabrication. Les enrobés de composition intermédiaire doivent alors être dirigés vers la trémie de stockage de l'ancienne composition. Lorsque la nouvelle formule est une formule "gros" et la formule en cours une formule "fin", après le changement de formule, la nouvelle formule n'est pas polluée par la formule en cours riche en bitume. Les enrobés de composition intermédiaire doivent être dirigés vers la trémie de stockage de la nouvelle formule.In the case where the new formula is a "fine" formula and the current formula a "large" formula, the new formula is polluted by the old low-bitumen formula, at the start of manufacture. The mixes of intermediate composition must then be directed to the storage hopper of the old composition. When the new formula is a "large" formula and the current formula a "fine" formula, after the change of formula, the new formula is not polluted by the current formula rich in bitumen. The mixes of intermediate composition must be directed to the storage hopper of the new formula.

Les données relatives à la composition des formules à élaborer par le poste d'enrobage sont en­ trées dans une table de priorité qui permet de comparer les compositions des formules successives et de détermi­ner la destination de stockage de la composition inter­médiaire.The data relating to the composition of the formulas to be developed by the coating station are in entered in a priority table which makes it possible to compare the compositions of the successive formulas and to determine the storage destination of the intermediate composition.

La trémie de chargement 24 ou trémie navette réalisant la distribution des matériaux enrobés dans les trémies de stockage 22 présente une capacité adaptée au débit du poste denrobage. Cette capacité est supérieure au double de la capacité de la trémie antiségrégation, comme indiqué plus haut.The loading hopper 24 or shuttle hopper distributing the coated materials in the storage hoppers 22 has a capacity adapted to the throughput of the coating station. This capacity is more than double the capacity of the anti-segregation hopper, as indicated above.

Le remplissage de la trémie de chargement 24 peut donc être réalisé par un ou plusieurs cycles d'ou­verture de la trémie antiségrégation 12.The filling of the loading hopper 24 can therefore be carried out by one or more opening cycles of the anti-segregation hopper 12.

Lors du fonctionnement normal de l'installa­tion pour la production d'enrobés de composition cons­tante, la trémie antiségrégation se vide à intervalles réguliers dans la trémie navette. La trémie navette assure le transport et la vidange de la charge d'enrobés dans une trémie de stockage et vient se replacer sous la trémie antiségrégation dont le remplissage s'est réalisé pendant le déplacement aller et retour de la trémie navette. La trémie navette transporte donc une charge d'enrobés constante et égale à la charge nominale Q0 de la trémie antiségrégation à chaque cycle.During normal operation of the plant for the production of asphalt mixes of constant composition, the anti-segregation hopper empties at regular intervals into the shuttle hopper. The shuttle hopper provides transport and emptying of the load of mixes in a storage hopper and is replaced under the anti-segregation hopper, the filling of which was carried out during the outward and return movement of the shuttle hopper. The shuttle hopper therefore carries a constant mix load equal to the nominal load Q0 of the anti-segregation hopper at each cycle.

Lors d'un changement de formule à la volée, on détermine, comme décrit précédemment, l'instant auquel les matériaux 8c de composition intermédiaire commen­cent à se déverser dans la trémie de réception 12. On connaît également la quantité totale de matériaux de composition intermédiaire.During a change of formula on the fly, it is determined, as described above, the instant at which the materials 8c of intermediate composition begin to pour into the receiving hopper 12. The total quantity of materials of intermediate composition is also known .

Dans une phase préparatoire au changement de composition, on assure l'évacuation, grâce à la trémie navette, de tous les enrobés de la composition en cours encore présents dans l'installation. La dernière trémie navette peut être remplie dune quantité d'enrobés de la composition en cours comprise entre Q0 et 2 Q0, c'est-à-­dire entre la capacité nominale de la trémie antiségré­gation et deux fois cette capacité, puisque la quantité restante d'enrobés suivant la composition en cours ne représente généralement pas un multiple exact de la capacité de la trémie antiségrégation.In a preparatory phase for the change of composition, it ensures the evacuation, thanks to the shuttle hopper, of all the mixes of the composition in progress still present in the installation. The last shuttle hopper can be filled with a quantity of mixes of the composition in progress between Q0 and 2 Q0, i.e. between the nominal capacity of the anti-segregation hopper and twice this capacity, since the remaining quantity of mixes according to the composition in progress does not generally represent an exact multiple the capacity of the anti-segregation hopper.

On assure ensuite l'évacuation des matériaux de composition intermédiaire.The materials of intermediate composition are then removed.

Dans le cas où la quantité à évacuer est inférieure à Q0, on effectue l'évacuation des matériaux de composition intermédiaire en une seule opération la trémie navette renferme à la fois les enrobés suivant la composition intermédiaire et une certaine quantité d'enrobés suivant la nouvelle composition pour compléter la charge à la valeur Q0.In the case where the quantity to be discharged is less than Q0, the materials of intermediate composition are evacuated in a single operation the shuttle hopper contains both the mixes according to the intermediate composition and a certain amount of mixes according to the new composition to complete the charge at the value Q0.

Dans le cas où la quantité à évacuer est comprise entre Q0 et 2 Q0, on effectue également l'éva­cuation des enrobés de composition intermédiaire en une seule opération, la trémie navette étant remplie jusqu'à un niveau supérieur au niveau Q0.In the case where the quantity to be discharged is between Q0 and 2 Q0, the mixes of intermediate composition are also evacuated in a single operation, the shuttle hopper being filled to a level higher than the level Q0.

D'autre part, la table de priorité permet de déterminer la trémie de stockage dans laquelle doit être vidée la trémie de chargement contenant des matériaux de composition intermédiaire et éventuellement des enrobés suivant la nouvelle composition.On the other hand, the priority table makes it possible to determine the storage hopper into which the loading hopper must be emptied containing materials of intermediate composition and possibly coated materials according to the new composition.

Dans le cas où la formule en cours 8b est une formule "gros" et la nouvelle formule 8a une formule "fin", la ou les opérations de vidange de la trémie navette 24 sont effectuées dans une trémie de stockage de la formule en cours 8b puisque la trémie navette renferme soit des enrobés de la nouvelle formule pollués par des enrobés de composition intermédiaire, soit des enrobés de composition intermédiaire dans lesquels la nouvelle formule est polluée par la formule en cours. Dans le cas où la formule en cours 8b est une formule "fin" et la nouvelle formule 8a une formule "gros", le contenu de la trémie de chargement 24 est déversé dans une trémie de stockage de la nouvelle composition 8a, puisque la trémie navette renferme soit des enrobés de la nouvelle composition qui ne sont pas pollués par les enrobés de composition intermédiaire soit des enrobés de composition intermédiaire comportant un mélange des deux formules.In the case where the formula in progress 8b is a "large" formula and the new formula 8a is a "fine" formula, the emptying operation or operations of the shuttle hopper 24 are carried out in a storage hopper of the formula in progress 8b since the shuttle hopper contains either mixes of the new formula polluted by mixes of intermediate composition, or mixes of intermediate composition in which the new formula is polluted by the current formula. If the current formula 8b is a formula "end" and the new formula 8a a "large" formula, the content of the loading hopper 24 is poured into a storage hopper of the new composition 8a, since the shuttle hopper contains either mixes of the new composition which are not not polluted by mixes of intermediate composition or mixes of intermediate composition comprising a mixture of the two formulas.

On évite ainsi toute perte de matériaux enro­bés par élimination des enrobés de composition intermé­diaire 8c dans un silo de refus. De plus, on peut ainsi garantir la qualité des produits élaborés par la centra­le d'enrobage.This avoids any loss of coated materials by eliminating the coated materials of intermediate composition 8c in a refuse silo. In addition, we can thus guarantee the quality of the products produced by the coating plant.

Sur la figure 2, on a représenté une variante de réalisation d'une installation denrobage dans la­quelle on met en oeuvre le procédé suivant l'invention. Les éléments correspondants sur les figures 1 et 2 portent les mêmes repères, avec toutefois l'exposant (prime) en ce qui concerne les éléments de l'installa­tion représentée sur la figure 2.In Figure 2, there is shown an alternative embodiment of a coating installation in which the method according to the invention is implemented. The corresponding elements in FIGS. 1 and 2 bear the same references, with however the exhibitor (premium) as regards the elements of the installation shown in FIG. 2.

A la différence de l'installation d'enrobage représentée sur la figure 1, l'installation représentée sur la figure 2 comporte un tambour-sécheur-enrobeur 1′ à courants parallèles, dans lequel les gaz chauds pro­duits par la flamme 5′ du brûleur 3′ circulent dans le même sens que les matières solides constituées par les granulats 4′.Unlike the coating installation shown in FIG. 1, the installation represented in FIG. 2 comprises a drum-dryer-coating 1 ′ with parallel currents, in which the hot gases produced by the flame 5 ′ of the burner 3 ′ circulate in the same direction as the solid matter constituted by the aggregates 4 ′.

Comme dans le cas du premier mode de réalisa­tion, le tambour 1′ présente une forme générale cylin­drique et son enveloppe est garnie intérieurement d'au­bes de relevage des agrégats.As in the case of the first embodiment, the drum 1 ′ has a generally cylindrical shape and its envelope is internally lined with aggregate lifting vanes.

Une lance d'injection de bitume 6′ est intro­duite par l'extrémité de sortie du tambour. L'extrémité de la lance 6′ par laquelle est effectuée l'injection du bitume débouche à l'intérieur du tambour en un point 7′ intermédiaire entre les deux extrémités du tambour. Le tambour comporte une zone de flamme dans laquelle se développe la flamme 5′ du brûleur et une zone de séchage s'étendant à la suite de la zone de flamme (à diamètre élargi) jusqu'au point d'injection de bitume 7′.A bitumen injection lance 6 ′ is introduced through the outlet end of the drum. The end of the lance 6 ′ through which the injection of the bitumen is carried out opens out inside the drum at a point 7 ′ intermediate between the two ends of the drum. The drum has a flame zone in which the flame 5 ′ of the burner develops and a drying zone extending after the flame zone (with enlarged diameter) to the point of injection of bitumen 7 ′.

Dans la partie terminale du tambour, entre le point d'injection 7′ et l'extrémité de sortie, l'enroba­ge des agrégats est assuré par un malaxage de ces agré­gats et du bitume liquide.In the terminal part of the drum, between the injection point 7 ′ and the outlet end, the aggregates are coated by mixing these aggregates and the liquid bitumen.

Les produits enrobés bitumineux 8′ élaborés dans le tambour se déversent en continu, à la sortie du tambour dans un convoyeur à raclettes 10′ assurant le transport des matériaux 8′ jusqu'à un niveau supérieur au niveau de chargement d'une batterie 20′ de trémies de stockage 22′. Les matériaux enrobés 8′ se déversent à la sortie du convoyeur à raclettes 10′, dans une goulotte 29 placée au-dessus d'un dispositif de chargement 30.The bituminous coated products 8 ′ produced in the drum are discharged continuously, at the exit of the drum in a squeegee conveyor 10 ′ ensuring the transport of the materials 8 ′ to a level higher than the level of charging of a battery 20 ′ 22 ′ storage hoppers. The coated materials 8 ′ are poured out of the scraper conveyor 10 ′, into a chute 29 placed above a loading device 30.

Le dispositif de chargement 30 comporte une goulotte centrale 31 et deux convoyeurs latéraux 32 et 32′ de direction transversale. Le dispositif 30 est monté mobile, grâce à des galets, sur un chemin de roulement situé au-dessus du niveau supérieur des tré­mies 22′. Le dispositif 30 peut être placé soit dans sa position représentée sur la figure 2, dans laquelle la goulotte 29 se trouve à la verticale de la goulotte centrale 31, soit dans une position décalée vers la droite ou vers la gauche, dans laquelle la goulotte 29 se trouve à la verticale de l'entrée du convoyeur 32 ou du convoyeur 32′ respectivement.The loading device 30 comprises a central chute 31 and two lateral conveyors 32 and 32 ′ of transverse direction. The device 30 is mounted movable, by means of rollers, on a raceway situated above the upper level of the hoppers 22 ′. The device 30 can be placed either in its position shown in FIG. 2, in which the chute 29 is located vertically from the central chute 31, or in a position shifted to the right or to the left, in which the chute 29 is vertical to the entrance of the conveyor 32 or the conveyor 32 ′ respectively.

Les camions de transport 25′ viennent en position de chargement en-dessous des différentes tré­mies 22′ de la batterie 20′.The transport trucks 25 ′ come in the loading position below the various hoppers 22 ′ of the battery 20 ′.

Le convoyeur peseur 2′ est alimenté en continu en granulats froids et humides par un ensemble 16′ comportant des trémies de stockage d'agrégats de diffé­rentes granulométries et/ou de matériaux pulvérulents.The weighing conveyor 2 ′ is continuously supplied with cold and wet aggregates by a 16 ′ assembly comprising hoppers for storing aggregates of different particle sizes and / or pulverulent materials.

Le convoyeur 2′ comporte une table de pesage 17′.The conveyor 2 ′ has a weighing table 17 ′.

Le réglage du débit de bitume injecté par la lance 6′, grâce à la pompe 18′ est effectué de la même manière que dans le cas du dispositif représenté sur la figure 1.The bitumen flow injected by the lance 6 ′ is adjusted by means of the pump 18 ′ in the same manner as in the case of the device shown in FIG. 1.

De même, au moment d'un changement de composi­tion des matériaux enrobés pour passer d'une composition 8′b en cours de fabrication à une nouvelle composition 8′a, la frange de composition intermédiaire 8′c est évacuée, grâce au dispositif 30, vers une trémie 22′ prédéterminée en fonction de la succession des fabrica­tions. Le temps de parcours et la quantité de matériaux de composition intermédiaire 8′c sont pris en considéra­tion, comme précédemment.Similarly, at the time of a change in composition of the coated materials to pass from a composition 8′b during manufacture to a new composition 8′a, the fringe of intermediate composition 8′c is evacuated, thanks to the device 30 , towards a hopper 22 'predetermined according to the succession of manufacturing. The travel time and the quantity of materials of intermediate composition 8′c are taken into consideration, as before.

L'invention ne se limite pas au mode de réali­sation qui ont été décrits.The invention is not limited to the embodiment which has been described.

C'est ainsi que l'invention peut être utilisée dans le cadre d'une centrale d'enrobage d'un type diffé­rent de ceux qui ont été décrits, dans la mesure où cette centrale d'enrobage comporte un dispositif de malaxage en continu, plusieurs trémies de stockage, un moyen de chargement sélectif des trémies de stockage et un dispositif de transfert des enrobés bitumineux entre la sortie du dispositif de malaxage et le moyen de chargement.Thus, the invention can be used in the context of a coating plant of a type different from those which have been described, insofar as this coating plant comprises a continuous mixing device, several storage hoppers, a means for selective loading of the storage hoppers and a device for transferring bituminous mixes between the output of the mixing device and the loading means.

Claims (6)

1.- Procédé de stockage de matériaux enrobés bitumineux, lors d'un changement de la formule de compo­sition de ces matériaux enrobés dont la fabrication par mélange de matériaux solides et de bitume est assurée en continu dans une installation comportant un dispositif de malaxage à chaud (1, 1′) alimenté en agrégats et en bitume liquide en un point d'injection (7, 7′), un ensemble de moyens de stockage des matériaux enrobés (20) et un moyen de transfert et de distribution (10, 12, 24 ; 10′, 29′, 30) des matériaux enrobés (8, 8′) dans les différents moyens de stockage (22, 22′), à partir de la sortie du dispositif de malaxage (1, 1′), comportant un dispositif de réception (12, 29) et un moyen de chargement (24, 30) dans lequel se déversent les matériaux parvenant au dispositif de réception (12, 29), la fabrication d'enrobés ayant une nouvelle formule de composition (8b) étant déclenchée par alimentation du dispositif de malaxage (1, 1′) en agrégats suivant la nouvelle composition et par détermination de l'instant (T0) auquel les agrégats (4, 4′) suivant la nouvelle composition parviennent au point d'injection de bitume (7, 7′) et du débit de bitume à incorporer à ces agré­gats (4, 4′), caractérisé par le fait :
- qu'on détermine le temps (T1) de parcours des maté­riaux enrobés (8, 8′) entre le point d'injection (7, 7′) et le dispositif de réception (12, 29),
- qu'on détermine la quantité de matériaux enrobés (8c, 8'c) fournie par le dispositif de malaxage (1), au moment du changement de composition, ayant une composi­tion intermédiaire (8c, 8′c) qui diffère de manière sensible de la nouvelle composition (8a, 8′a) et l'ins­tant auquel les matériaux de composition intermédiaire (8c, 8′c) parviennent au dispositif de réception (12, 29),
- qu'on réalise l'évacuation des matériaux de composi­tion intermédiaire (8c, 8′c) grâce au moyen de charge­ment (24, 30) en fonction de la quantité de matériaux déterminée précédemment et en fonction de l'instant auquel les matériaux de composition intermédiaire par­viennent au dispositif de réception (12, 29),
- et qu'on vide le moyen de chargement (24, 30) conte­nant la composition intermédiaire dans l'un des moyens de stockage (22, 22′) prédéterminé en fonction de la différence de composition entre la composition en cours de fabrication et la nouvelle composition.1.- Method for storing bituminous coated materials, during a change in the composition formula of these coated materials, the manufacture of which by mixing solid materials and bitumen is carried out continuously in an installation comprising a hot mixing device (1, 1 ′) supplied with aggregates and liquid bitumen at an injection point (7, 7 ′), a set of means for storing the coated materials (20) and a means for transfer and distribution (10, 12 , 24; 10 ′, 29 ′, 30) of the coated materials (8, 8 ′) in the various storage means (22, 22 ′), from the outlet of the kneading device (1, 1 ′), comprising a receiving device (12, 29) and a loading means (24, 30) into which the materials arriving at the receiving device (12, 29) are poured, the manufacture of mixes having a new composition formula (8b) being triggered by supplying the mixing device (1, 1 ′) with aggregate ats according to the new composition and by determining the instant (T0) at which the aggregates (4, 4 ′) according to the new composition arrive at the bitumen injection point (7, 7 ′) and the bitumen flow rate to be incorporated into these aggregates (4, 4 ′), characterized by the fact:
- determining the time (T1) of travel of the coated materials (8, 8 ′) between the injection point (7, 7 ′) and the receiving device (12, 29),
- that one determines the quantity of coated materials (8c, 8'c) supplied by the kneading device (1), at the time of the change of composition, having an intermediate composition (8c, 8′c) which differs significantly of the new composition (8a, 8′a) and the moment at which the materials of intermediate composition (8c, 8′c) reach the reception device (12, 29),
- that the material of intermediate composition (8c, 8′c) is removed using the loading means (24, 30) as a function of the quantity of materials determined previously and as a function of the instant at which the materials of intermediate composition reach the receiving device (12, 29),
- And that the loading means (24, 30) containing the intermediate composition is emptied into one of the storage means (22, 22 ′) predetermined as a function of the difference in composition between the composition during manufacture and the new composition. 2.- Procédé de stockage suivant la revendica­tion 1, lors d'un changement de la formule de composi­tion des matériaux enrobés bitumineux pour passer d'une formule plus pauvre en bitume une formule plus riche en bitume, caractérisé par le fait que le moyen de chargement (24, 30) transfert les matériaux de composi­tion intermédiaire dans la trémie du moyen de stockage (22, 22′) destinée à recevoir l'ancienne composition pauvre en bitume.2.- storage method according to claim 1, when changing the composition formula of bituminous coated materials to move from a formula leaner in bitumen to a formula richer in bitumen, characterized in that the means of loading (24, 30) transfers the materials of intermediate composition into the hopper of the storage means (22, 22 ′) intended to receive the old composition poor in bitumen. 3.- Procédé de stockage de matériaux enrobés bitumineux suivant la revendication 1, lors d'un change­ment de la formule de composition de ces matériaux enrobés pour passer d'une composition plus riche en bitume à une composition plus pauvre en bitume, carac­térisé par le fait que le moyen de chargement (24, 30) transfert les matériaux de composition intermédiaire dans la trémie du moyen de stockage (22, 22′) destinée à recevoir des enrobés selon la nouvelle composition plus pauvre en bitume.3.- A method of storing bituminous coated materials according to claim 1, when the composition formula of these coated materials is changed to go from a composition richer in bitumen to a composition leaner in bitumen, characterized by fact that the loading means (24, 30) transfers the materials of intermediate composition into the hopper of the storage means (22, 22 ′) intended to receive mixes according to the new composition leaner in bitumen. 4.- Procédé de stockage suivant l'une quelcon­que des revendications 1 à 3, caractérisé par le fait que le moyen de chargement (24) est constitué par une trémie navette (24) mobile au-dessus des trémies de chargement (22) entre une position située à la verticale et en-dessous du dispositif de réception (12) du moyen de transfert constitué par une trémie de déversement (12) telle qu'une trémie antiségrégation et une position située à la verticale d'une trémie de stockage (22) quelconque.4.- storage method according to any one of claims 1 to 3, characterized in that the loading means (24) is constituted by a shuttle hopper (24) movable above the loading hoppers (22) between a vertical position and below the receiving device (12) of the transfer means constituted by a discharge hopper (12) such as an anti-segregation hopper and a position situated vertically from any storage hopper (22). 5.- Procédé de stockage suivant la revendica­tion 4, caractérisé par le fait que la trémie navette (24) a une capacité au moins égale au double de la capacité Q0 de la trémie de déversement (12).5.- A storage method according to claim 4, characterized in that the shuttle hopper (24) has a capacity at least equal to twice the capacity Q0 of the discharge hopper (12). 6.- Procédé de stockage suivant l'une quelcon­que des revendications 1 à 3, caractérisé par le fait que le moyen de chargement (30) est constitué par une goulotte de déversement (31) et au moins un convoyeur (32, 32′), mobile au-dessus des trémies de chargement (22′) de manière que, soit la goulotte (31), soit l'en­trée du convoyeur (32, 32′) soit placée à la verticale et en-dessous du dispositif de réception (29) constitué par une goulotte de déversement.6.- A storage method according to any one of claims 1 to 3, characterized in that the loading means (30) consists of a discharge chute (31) and at least one conveyor (32, 32 ′) , movable above the loading hoppers (22 ′) so that either the chute (31) or the inlet of the conveyor (32, 32 ′) is placed vertically and below the receiving device ( 29) consisting of a discharge chute.
EP90402390A 1989-09-12 1990-08-29 Storage system for bituminous mixtures after changing the composition formula of these mixtures Withdrawn EP0418111A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8911899 1989-09-12
FR8911899A FR2651810A1 (en) 1989-09-12 1989-09-12 PROCESS FOR STORING BITUMINOUS COATED MATERIALS, WHEN CHANGING THE COMPOSITION FORMULA OF THESE COATED MATERIALS.

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EP0418111A1 true EP0418111A1 (en) 1991-03-20

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB880481A (en) * 1957-04-13 1961-10-25 Roland Mertens Improvements in or relating to continuous-mixing apparatus
GB1169223A (en) * 1966-09-27 1969-10-29 Herbert Clement Tampin Hot Storage Vehicle Loading Plant
FR2140322A1 (en) * 1971-06-10 1973-01-19 Etu Realisa Cybernetique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB880481A (en) * 1957-04-13 1961-10-25 Roland Mertens Improvements in or relating to continuous-mixing apparatus
GB1169223A (en) * 1966-09-27 1969-10-29 Herbert Clement Tampin Hot Storage Vehicle Loading Plant
FR2140322A1 (en) * 1971-06-10 1973-01-19 Etu Realisa Cybernetique

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CA2024405A1 (en) 1991-03-13

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