EP0896094B1 - Machine in a road paving recycling train for cold recycling of road paving - Google Patents

Machine in a road paving recycling train for cold recycling of road paving Download PDF

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Publication number
EP0896094B1
EP0896094B1 EP19980111831 EP98111831A EP0896094B1 EP 0896094 B1 EP0896094 B1 EP 0896094B1 EP 19980111831 EP19980111831 EP 19980111831 EP 98111831 A EP98111831 A EP 98111831A EP 0896094 B1 EP0896094 B1 EP 0896094B1
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EP
European Patent Office
Prior art keywords
machine
mixing
machine according
suction
train
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.)
Expired - Lifetime
Application number
EP19980111831
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German (de)
English (en)
French (fr)
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EP0896094A1 (en
Inventor
Antonio Cipriani
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.)
Marini SpA
Original Assignee
Marini SpA
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Filing date
Publication date
Application filed by Marini SpA filed Critical Marini SpA
Publication of EP0896094A1 publication Critical patent/EP0896094A1/en
Application granted granted Critical
Publication of EP0896094B1 publication Critical patent/EP0896094B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving

Definitions

  • the present patent has for object a machine for road paving cold recycling train.
  • the train comprising said machine is also object of the invention.
  • the invention finds particular even if not exclusive application as a self-propelled or towed equipment for operating "in situ” in the road paving and repaving utilising also the recyclable material obtained by the milling (scarification) of the already existing road paving (art commonly also known as “stabilisation”).
  • the art of road repaving directly on road provides the mixing and preparation of components on the same road after having carried out the milling of the road paving by means of a self-propelled milling machine known as scarifier machine, which mills the material by means of an upstream milling machine discharging it in the shape of a continuous heap, that is loose material string, with possible addition before or after the milling, of new grit by a grit spreader, for the correction of the new granulometric curves.
  • scarifier machine which mills the material by means of an upstream milling machine discharging it in the shape of a continuous heap, that is loose material string, with possible addition before or after the milling, of new grit by a grit spreader, for the correction of the new granulometric curves.
  • the blade may be used only when the amount of material to be mixed on the road is relatively small, and furthermore, many machines are necessary for the work and an even mixing is impossible to be obtained, finally the operating times are extremely long and the use of concrete creates the drawback of raising a considerable amount of concrete dust.
  • the mechanical mixing is carried out by rotational agitation of aggregate and binder which occurs by means of one or more horizontal shafts provided with vanes.
  • the "Wood train” is substantially made up of:
  • the work is started by the scarifier machine which mills the road paving at a certain depth transforming the road paving in granular form discharging it as string (loose material string) downstream where the heap shaper-measurer adjusts it.
  • the corrective grit is spread by a grit-spreader upstream of the scarifier machine, directly on the road paving which must be milled, so that an even mixing of the virgin material with the one to be recycled is obtained, by means of the action of the same millers.
  • the train of machines which mainly concern the mixing, therefore downstream of the scarifier which generally operates separately, consequently provides at the top, a movable loader which conveys the material previously prepared in strings to a proportioning hopper, from which by a suitable volumetric dosage, it is discharged on a mixing towed machine.
  • the mixing towed machine mixes the materials inserting the hot or cold bituminous binder in a mixer, by a pump connected to the aggregates feeding system so to add the binder necessary for the mixing picking it up from the tank truck also located on the train or placed by its side.
  • the mixer is made up of a cylinder having a rotor with buckets supported by hydraulic jacks connected to the machine frame.
  • One or more direct flame burners for the eventual binder heating are provided.
  • the mixed material is discharged as a string (loose material string), from the cylinder rear mouth.
  • the material laying is carried out by vibratory finishing machine fed by suitable loader, with following pressing or rolling, carried out by gummed rolls and vibratory tandem rollers.
  • the tank truck has the function of constantly feeding the binder (if it is a bituminous one) or water (when concrete is used) to the mixer and it must therefore move in step with the other machines group.
  • the train advances being fed by the string (loose material string) of material which it finds in front of it and leaves behind a string (loose material string) of mixed material ready to be used for the road repaving.
  • the same train may carry out stabilisations with concrete or other binders (generally cold) such as for example bituminous conglomerates in solution with solvents or in water emulsion.
  • binders generally cold
  • the concrete is spread with the corrective material such as for example new grit (not necessarily simultaneously) before the milling end the mixer will receive water from the tank truck in the ratio required.
  • the corrective material such as for example new grit (not necessarily simultaneously)
  • IT-83469 A/88 claims an equipment for the continuous mixing and producing of different compositions conglomerates, in which it is provided:
  • the mixing unit comprises a mixing group (equipped/able with a device for spraying water or volumetrically dosed bituminous binders), of the "Trough” type with a couple of horizontal and slightly tilted shafts, placed longitudinally parallel to each other provided with opposite rotating mixing vanes.
  • the result will be a train having a restrained width.
  • US4290820A discloses a front-end apparatus for collecting particulate material on a roadway surface comprising a frame assembly, drivingly supported on the roadway, a windrow formation assembly supported at the forward end of the frame assembly for brushing particulate material into a windrow. and a feeder assembly disposed to engage the windrowed material up and onto a roadway scraper blade supported at the forward end of the frame assembly.
  • An elevator assembly is disposed to receive the particulate material from the feeder assembly and elevate the material to a rear overhead discharge position.
  • a residual material cleaning assembly is supported beneath the frame assembly and rearward to the feeder assembly for cleaning up residual material not collected by the feeder assembly, the residual material cleaning assembly directing the residual material to the elevator assembly so that the residual material is elevated to the rear overhead discharge position.
  • EP-A-0378973 (Todini Costruzioni Generali), discloses a train with two-connected machines having:
  • the means for the cleaning and subjecting to suction the roadbed is a single fixed one device, so not adjustable in width.
  • Purpose of the present invention is to better perform this apparatus and is that of obviating the above mentioned drawbacks and in particular of realizing a compact and operationally effective train for supplying a more reliable and lasting road stratification.
  • the present invention solves the mentioned problems as claimed by means of a machine movable on wheels or tracks, for a road paving cold recycling train, for the continuous collection of loose material in a loose material string along the road carpet restoration path, of the type frontally involving two arms with means for the collection of the loose material in front of its path and conveying means on a downstream mixing machine, wherein between the front wheels or tracks and rear wheels or tracks, some suction means (SA) are installed intended to suck all that granulated material and dust which the front collecting means were not able to collect from the underlying paving, characterized in that said suction means comprise a transversal extended suction mouth placed centrally and two extended suction mouths placed laterally movable and adjustable in their distance and extending for such a width to cover a part of the central one and project at least beyond the central one.
  • SA suction means
  • said laterally placed suction mouths are retractable within said central suction mouth width.
  • said-centrally placed suction mouth is the front one while said two laterally placed suction mouths, are placed behind the first one respect to the advancement direction.
  • said -suction mouths are connected to suction means for piping by flexible ducts.
  • suction ducts are structurally placed more functionally.
  • said-suction mouths are connected to a suction group preceded by a decantation tank.
  • said-suction mouths are suspended by articulated arms tilted backwards respect to the advancement direction.
  • At least one of said articulated arms is parallelogram-like shaped.
  • said-suction mouths involve downstream respect to the advancement direction some paving resting small wheels behind the respective suction mouths.
  • said-decantation tank and suction means are substantially placed in the front, with the collecting means in the back and above a respective conveyor belt which from beneath and behind the front collecting means, raises tilted backwards and protrudes backwards with a jut for the downstream discharge.
  • the rear machine has a screening and further grinding system (B) to which with an analogous system the mixing machine is fastened according to the previous claim.
  • said-collecting machine comprises a container of liquid to be added to mixing means of the rear mixing machine.
  • said tank for liquid material is equipped with heating means for the contained liquid.
  • the machine is self-propelled and it is endowed with at least one front control position and with a rear bascule hitch for the hitching of a trailer which makes up the rear mixing or intermediate screening and grinding machine.
  • the train realized comprises at least one towed mixing machine which utilises:
  • the train is made operationally universal for operating both with a solid and with a liquid binder.
  • the mixing machine has a mixing group of the type having a couple of substantially horizontal shafts, parallel to each other and rotating in opposition equipped with radial vanes.
  • an intermediate machine for working again the material to be recycled comprising means for the screening of the material to be recycled, means for the crushing of the screen scrapped material and means for conveying all the material, both screened and crushed to said rear mixing machine.
  • said -mixing machine upstream comprises a compensation hopper:
  • said detachable unit for the solid binder powdery addition comprises:
  • said-detachable unit for the liquid binder addition comprises:
  • Figure 1 shows a schematic elevation side view of the machine for collecting and mixing the loose material string (loose material milled or placed by the preceding machine along the road in a continuous heap similar to a string) on the road as a means movable on wheels, towed or self-propelled, according to the present invention.
  • Figure 2 shows a working train view, utilising a tracked collecting and mixing machine according to the invention as a variation to Fig. 1 and with advancement direction opposite respect to the machine of Fig. 1.
  • Figure 3 shows a view as in Fig. 1 in which the mixing equipment is seen from the top.
  • Figure 4 shows a train as in Fig. 2 equipped with auxiliary tank for proportioning the bituminous emulsion together with the one installed on the mixing means.
  • Fig. 5 shows a working train with an intermediate trailer for the screening of the collected material and for the crushing of the crumbs too large to be set in cycle again on the following mixing trailer.
  • Figures 6 and 7 show two interchangeable disassembled units alternatively mountable on the mixing machine according to the need of adding concrete binder in powdery solid form or of adding bituminous binder in liquid form.
  • Figure 8 shows an operating scheme of the bituminous liquid binder heating and feeding for the machine as in figures 3,4 utilising the feeding unit as in figure 7.
  • Figure 9 shows a section view of the mixing machine (C), behind the hopper 3.
  • Figures 10 and 11 show the embodiment of the mixer with two opposite shafts of the hopper 3 of the material mixing machine, better illustrated in the two versions in the following figures 12 and 13.
  • the Figures 12 and 13 show the mixing machine in the two forms both having also cold solid binder and liquid binder (for example of the type with chemical reaction with accelerating products).
  • the train comprises at least the loose material string collecting machine (A), which is directly followed by the mixing trailer (C) Figs. 2, 4 or by the screening and grinding one (Fig. 5).
  • the loose material string collecting machine (A) comprises on the front some conveying jaws (23) for collecting loose material string (milled material to be recycled) with overhanging drive cabin of known art (23').
  • the material is transported by a conveyor belt (24) downstream for being discharged on the following trailer (B or C).
  • first drum-like rotating brush 231 which is placed tilted and extends beyond the edge of the scarification line, for brushing the material within the scarification line generally being some centimetres lower.
  • Two opposite adjustable tilted deflectors have the function of conveying and better join the loose material string scarified by the front milling machine or laid by front machines, before the collection by the collection mouth 235 of known art.
  • the present invention is substantially aimed at this first machine because between the front wheels and tracks group and the rear wheels and track group, the suction group (SA) is applied.
  • the suction group (SA) by three suction mouths, of which a central one 91 and two lateral ones 91' adjustable towards the centre or outwards which allow to cover the whole roadway, will determine the complete suction of granules and dust not collected by the front collecting system (23).
  • the sucked material is conveyed by flexible pipes to a decantation tank or collector 92 upstream of an exhauster 93 which will discharge the sucked air from the bottom (91,91') outside.
  • a second mixing machine (C) is joined in the rear and towed, which has an alternative interchangeable mixing unit for adding solid (concrete) or liquid binder material (7, 7a Figs. 6 and 7).
  • This mixing machine has practically the function of proportioning, stocking and mixing.
  • the machine has substantially the function of:
  • the mixing machine (C) comprises substantially a trailer structure (1), on whose frame is frontally mounted an hopper for loading the agglomerate material (T/20) coming from the front collecting self-propelled machine (A).
  • This hopper (T) is wide enough for acting as plenum chamber for the charge material so to compensate the flow variations being provided at its base with an adjustable proportioning device of known art, and having in it some minimum and maximum level indicators in order to allow the control of the overload and subload conditions.
  • the hopper (T) is also provided with vibratory means with adjustable vibratory characteristics with intermittent working for easing the materials downflow.
  • a conveyor belt (2.1) with variable speed electric working conveys the weight dosed material from the hopper (2) into the mixing group placed between the side members of the trailer frame (3).
  • the mixing group (3) is of the type with two longitudinally placed shafts, parallel to each other (3.1-3.2) with reversible adjustable vanes (3.5), with upper entry system upstream (3.3) and lower discharge downstream (3.4) on a conveyor belt (4) which discharges the mixed conglomerate behind the means for the following laying and pressing for the road carpet betterment.
  • a generator set (6) for feeding power to the motors and to the eventual heating means is placed. Close to it is also placed in an easy accessible position the electric equipment cabin (5).
  • the interchangeable binder feeding units respectively comprise a unit for supplying powder concrete (7) and a unit for liquid bituminous substances in cold emulsion or anyway at a low temperature (7a).
  • Both the concrete feeding unit (7) and the bituminous binder feeding one (7a) provide a tank which extends over the mixer (3), with feet for the resting and fixing to the trailer (1) side members astride of the mixing group and both have on their rear the operating and control means.
  • the solid binding substances addition unit (7) further comprises a filter system for discharging the pressurised air which is inlet in its inside during the concrete loading, allowing the air discharge in the atmosphere and simultaneously avoiding the concrete outlet.
  • a buffer hopper (13) is also provided to which the conveying system leads made up of: extraction scrolls (10), by collecting scroll (11) and lifting scroll (12), which provides to pour the concrete into the buffer hopper (13) beneath which an adjustable proportioning delivering system of the volumetric type of known art which discharges the concrete in a conveying scroll to the mixer (15) is provided.
  • the liquid binding substances addition unit (7a) provides on the rear a boiler (16) with vertical burner from the top downwards (17) which heats a diathermic oil pipe which extends as a coil (18) within the respective tank (7a) by pump circulation (19 Fig. 8).
  • the liquid binder control system is carried out according to the scheme as in Fig. 8 in which the use of a feeding pump to the mixer (20) with liter-counter (21) may be seen, while the spraying ramp (22) is inserted within the mixing group and above the mixing shafts couple (3.1-3.2).
  • the head compensation hopper (T/20) acting as a plenum chamber makes furthermore possible also operating on uneven strings and this independently of the respective operating speed.
  • the device for spraying the binder on the roadbed 8 is provided, which wetting the clean surface, thanks to the exhauster carefully placed according to the present invention in the machine (A) makes possible the better sticking of the material by the following passing of the train final machine (not shown) which will lay, stretch and compact the material at its thickness (vibratory finishing machine).
  • the suction system SA provides the suction mouths (91, 91') being articulated by articulated arms (94) preferably parallelogram-like shaped for keeping the mouths horizontal (94'), some rear small wheels for maintaining the distance constant respect to the paving (95, 95') being provided, being the suction ducts of the flexible type for an easy fitting to the respective movement.
  • This machine is equipped with variable revolutions volumetric pump for the water dosage, or of the bituminous binder, by a delivery mass meter.
  • the pump delivery is controlled by the mass meter in function of the momentary delivery measured for the inert materials.
  • the ground spraying ramp is located on the rear (8), for spraying the layer which sticks on the previously perfectly cleaned roadbed according to the invention by the front machine device (SA).
  • SA front machine device
  • the ramp comprises means for the sprayed material heating.
  • an intermediate trailer (B) between the machine (A) and the machine (C) is provided, with the function of collecting the material poured by the front collecting machine (A) by means of the conveyor (24) for screening it in the hopper (26) and deviating the too large milled material to the crusher or grinder (27) which pours the crushed material. that is granulated, on the underlying conveyor (28) of the previously screened material for making it enter the following mixing trailer (C) by means of a conveyor belt (30).
  • An eventual head milling machine (not shown) will provide for the old asphalt thickness milling arranging it in a loose material string for being collected by the machine (A).

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Repair (AREA)
  • Road Paving Machines (AREA)
EP19980111831 1997-08-06 1998-06-26 Machine in a road paving recycling train for cold recycling of road paving Expired - Lifetime EP0896094B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD970143 1997-08-06
IT97UD000143 IT1295733B1 (it) 1997-08-06 1997-08-06 Macchina per treno di riciclaggio a freddo di pavimentazione stradale

Publications (2)

Publication Number Publication Date
EP0896094A1 EP0896094A1 (en) 1999-02-10
EP0896094B1 true EP0896094B1 (en) 2003-05-21

Family

ID=11422442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980111831 Expired - Lifetime EP0896094B1 (en) 1997-08-06 1998-06-26 Machine in a road paving recycling train for cold recycling of road paving

Country Status (3)

Country Link
EP (1) EP0896094B1 (it)
DE (1) DE69814755T2 (it)
IT (1) IT1295733B1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1052334B1 (en) * 1999-05-12 2005-03-23 MARINI S.p.A. Mobile mixer to be used in train for cold recycling asphalt conrete roadways

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195946A (en) * 1977-02-04 1980-04-01 Cmi Corporation Method for resurfacing a paved roadway
DE2847924A1 (de) * 1978-11-04 1980-05-14 Reinhard Wirtgen Verfahren zum abfraesen oder abschaelen von strassenbelaegen aus einem thermoplastischen material
DE2850344A1 (de) * 1978-11-20 1980-05-22 Reinhard Wirtgen Verfahren und vorrichtung zum abtragen und neubeschichten von strassendecken
US4290820A (en) * 1979-02-07 1981-09-22 Cmi Corporation Method and apparatus for collecting particulate material on a roadway
FR2611767B1 (fr) * 1987-03-03 1989-06-30 Beugnet Sa Atelier de regeneration d'une chaussee
IT8947534A0 (it) * 1989-01-13 1989-01-13 Todini Costruzioni Generali S Macchinario a pluricomponenti semovente per confezionamento in sito e stesa di conglomerato bituminoso a freddo
AT398997B (de) * 1991-02-01 1995-02-27 Vialit Gmbh Oesterr Verfahren zur herstellung von dünnen decken auf bodenflächen, insbesondere verkehrsflächen

Also Published As

Publication number Publication date
IT1295733B1 (it) 1999-05-27
EP0896094A1 (en) 1999-02-10
DE69814755D1 (de) 2003-06-26
DE69814755T2 (de) 2004-02-26
ITUD970143A1 (it) 1999-02-06

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