FR2550248A1 - MOBILE DEVICE FOR COLD WINDING AND ROAD SPREADING OF BITUMINOUS COATED PRODUCTS FOR ROAD COVERINGS - Google Patents

Abstract

THE INVENTION RELATES TO A MOBILE DEVICE FOR COLD PREPARATION AND SPREADING OF BITUMINOUS COATED PRODUCTS. THE DEVICE INCLUDES A LARGE CAPACITY AGGREGATE HOPPER 20 AND A FEEDING DEVICE FOR THIS HOPPER 20 WITH AGGREGATES. THE FEEDING DEVICE INCLUDES A RECEPTION HOPPER 14 AT THE LOWER PART AND AT THE FRONT OF THE MOBILE DEVICE, A BUCKET ELEVATOR 12 WITH AN INCLINATION GREATER THAN 45 FOR TRANSPORTING THE AGGREGATES FROM HOPPER 14 TO STORAGE HOPPER 20 AND AN AGGREGATE DISTRIBUTION DEVICE 31 ACCORDING TO THE LENGTH AND ACCORDING TO THE WIDTH OF THE HOPPER 20. A SINGLE THERMAL MOTOR 5 ALLOWS THE DEVICE TO BE DRIVEN ON THE HIGHWAY AT FAST SPEED AND ON THE WORKSITE AT LOW SPEED. THE INVENTION APPLIES, IN PARTICULAR, TO DEVICES FOR THE PREPARATION AND SPREADING OF CAST COATINGS FOR ROAD COATINGS.

Description

Mobile device for cold processing and spreading on site

  The invention relates to a mobile device for cold forming and on-site spreading of bituminous asphalt products for road pavements. Road pavements made from bituminous materials are generally obtained by spreading asphalt. aggregates coated with bitumen on the surface to be coated followed by compaction of these mixes Aggregates consist of pebbles with a greater or lesser granulometry and are generally mixed with a certain proportion of powdery materials. Depending on the standards required for the coating to be produced and the local operating conditions, a process can be used.

  hot forming or cold forming of asphalt mixes.

  Hot-mix asphalt processes require complex installations which provide both drying and heating of the aggregates, incorporation of the powder and granules, and coating.

  mixing with molten bitumen Such installations can be permanently installed on an industrial site or, on the contrary, on an occasional site for the duration of a road project.

  In all cases, it is necessary to ensure the transport of the coated materials by trucks between the facility ensuring their development at a fixed position and their place of use on the road construction site.

  In the cold forming processes of the mixes, the aggregates added with powdery materials are mixed with a bituminous emulsion, with water and with additives making it possible to improve the tackiness of the bitumen on the aggregates before making a mixture of the most homogeneous possible

all in a mixer.

  For the implementation of the process of cold preparation of asphalt mixes, it has been possible to develop mobile construction machines which perform both the manufacture of asphalt mix and their spreading on the ground during slow speed movements of the road. In particular, these machines are well adapted to the development and spreading of

cast asphalt.

  Such machines comprise a wheel-mounted frame carrying all the storage capacities of the various materials required for the manufacture of the mixes, various means for sampling and dosing these materials, means for transferring the materials to the kneader, the mixer itself to continuously pour coated products

  on the floor and possibly a means for finishing the coating.

  Such devices, however, have disadvantages on the one hand because of their low autonomy which requires frequent replenishment of aggregates and secondly because of the impossibility of making road journeys to these machines, which requires the organization of special and expensive transport to move from one road construction site to another.

  Even in the case where these machines have a self-feeding aggregates device that allows the filling of the aggregate hopper with transfer means incorporated in the machine, the organization of the site is made complicated and the efficiency of the machine is decreased Due to the small capacity of the aggregate hopper The self-feeding means as they are designed on known machines are indeed very bulky and do not allow the filling of hoppers large capacity, that is to say In spite of a prohibitive overall size and in any case incompatible with a movement on the road, these machines do not allow a continuous and high-performance work on the site particularly when the quantity of cold mixes are between 15 and 25 kg per surface meter In addition, these machines are not equipped with a transmission allowing to obtain sufficient travel speeds for road transport.

  It has also been proposed machines that can travel on the road which included a part of the bodies necessary for the manufacture of cold mixes mounted on a truck or a trailer Such devices do not include means of self-supply aggregates and require a supply by an additional construction machine These machines are not autonomous and their supply is discontinuous.

  thus losing the benefits of their road mobility.

  All the known self-feeding devices comprise a motorization whose kinematics do not make it possible to operate the machine according to the needs of the operation, in transfer or in spreading. These 35 machines have a motorization calculated solely for the implementation of the coated at slow speed Their speed of movement is limited

  by construction at 15/25 km per hour.

  The object of the invention is therefore to provide a mobile device for cold processing and spreading asphalt paving products on the building site during slow speed movement of the device which is also likely to move on high-speed road and which comprises a wheel-mounted chassis carrying a storage space of high-capacity aggregates associated with a feed device comprising a receiving hopper arranged at the front and at the bottom of the device, capacities storage of pulverulent materials, bituminous emulsion, water and additives and means for sampling these materials in their storage capacity in quantities of 10 seconds and supply of these materials to a mixer also carried by the frame ensuring the continuous discharge of the products on the ground, a device which is entirely autonomous on the construction site and which meets the road standards without structure modification for its transfer from one site to another by its own means For this purpose, the aggregate feeding device comprises: a bucket elevator for transporting aggregates between the receiving hopper and the upper part of the aggregate storage hopper whose inclination relative to the plane of the chassis is greater than 45,

  and a device for distributing aggregates along the width and along the length of the storage hopper placed above this hopper and comprising at least one endless chain moving in a substantially horizontal direction and corresponding to the longitudinal axis of the frame , over the entire length of the hopper, carrying transverse bars 25 whose length substantially corresponds to the width of the storage-hopper which itself is only slightly less than the width of the frame.

  The invention also relates to a mobile device whose motorization both in high-speed road operation and in slow-speed on-site operation is provided by a single heat engine.

  In order to better understand the invention, will now be described by way of non-limiting example, with reference to the accompanying figures, an embodiment of a mobile device for the manufacture on site of cold bituminous concrete that is, cold mixes including low and medium grain size aggregates.

  Figure 1 is an elevational view partially in section of the mobile device according to the invention.

  Figure 2 is a view along F1 of Figure 1.

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  Figure 3 is a section along AA of Figure 1.

  FIG. 4 is a view F 2 of FIG. 1; FIG. 5 is a schematic representation of the transmission device for moving on the road and for moving the mobile device according to the invention to a slow speed site. FIG. 1 shows in solid lines the device

  in its working position on-site and in phantom the position of the bucket of a truck supplying the aggregate hopper of this device.

  The device comprises a chassis 1 resting on four trains of

  Wheels 2 a, 2 b, 2 c, 2 d, the axles of the trains 2 this 2 d being engines via the bridges 3 and 3 has a group of engines including in particular a heat engine 5 and a gearbox 6 This machine group will be described in detail with reference to FIG. 5.

  The machine moves on the ground 7 of the site whose preparation has been provided to receive the bituminous coating 8 deposited by the machine As can be seen in FIGS. 1 and 2, the frame 1 carries a driving cabin 10 of the machine whose width is less than the half-width of the frame and occupies only part of the left half of this frame Part of the right half of the frame is occupied by an additive storage capacity 11 in liquid form with a capacity of 2000 liters Between the cabin 10 and the tank 11 and between the two side members 25 of the frame 1 is inserted the bucket elevator 12 forming part of the self-feeding device of the aggregates of the machine Ce self-feeding device comprises a receiving hopper 14 placed at the front of the machine and at its lower part just above the ground 7 This hopper 14 is placed transversely and has a width slightly greater than 30 width of the frame, its lateral parts being foldable during the road travel of the machine The hopper 14 comprises a screw for refocusing the materials 16 having two parts with opposite pitch This screw 16 makes it possible to direct the materials introduced into the hopper 14 towards the exit of this communicating with the inlet of the housing 17 of the bucket elevator 35 12 The receiving hopper 14 is fixed on the end of the longitudinal members of the

  frame 1 and the bucket elevator 12 communicating with the central portion of this hopper is disposed between the two side members at the central part of the device.

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  The bucket elevator 12 comprises a housing 17 and a set of buckets carried by two chains 18 whose direction of upward movement towards the rear of the machine makes an angle of 60 with the plane of the frame 1 The upper part of the housing 17 the bucket elevator 12 communicates through its outlet opening 19 with the upper part of the storage hopper 20 of the granules As can be seen in FIGS. 1 and 3, this hopper 20 occupies the greater part of the length of the machine and its width, at least in its upper part, is little less than the total width of the frame Above this hopper and over its entire length is placed a device for distributing the aggregates called the strip-type regulator allowing ensure the spreading of aggregates over the entire length and over

  the width of the storage hopper 20.

  The bar trimmer 31 is constituted by one or two endless chains 21 wound on pulleys or end gears 22 and carrying transverse bars 23 whose course is very slightly inclined

up from front to back.

  The pulleys or pinions 22, as can be seen in FIG. 3, are mounted two by two on journalling pins 24 mounted in

  Bearings 25 secured to the vertical walls of the hopper 20 The bucket elevator 12 and the bar regaler 31 are driven in their movement to transport the aggregates 27 by hydraulic motors associated with reducers that have not been shown.

  In Figure 1 the bucket 28 of a truck for the supply of aggregates of the machine has been shown in phantom in its discharge position in the receiving hopper 14 The chassis of the truck is then connected by a shackle 29 In this way, the aggregates 27 are poured in a controlled manner into the receiving hopper 14 and then conveyed by the bucket chain 18 to the machine. upper portion of the hopper 20 o the bar feeder 21 allows spreading of the aggregate load over the entire surface of the hopper 20 of

big section.

  A perfectly balanced filling of the hopper 20 is thus achieved despite its great length and width. The use of a steep bucket conveyor also makes it possible to raise the material to a great height despite a small footprint of the hopper. Elevator in the longitudinal direction of the machine Unlike the devices of the prior art, the longitudinal size of the elevator for feeding the storage hopper aggregates does not increase the length of the machine since this elevator is disposed between the cabin 10 and the tank 11 in the longitudinal dimension thereof. It has thus been possible to build a machine that remains to road standards, self-powered and with a large aggregate storage capacity. For a chassis width of 2.50 meters, a total height of 10 meters of the machine and a length of 11 meters. meters, one can have a

  storage hopper 20 with a capacity of 10 cubic meters.

  Under the hopper 20 is arranged a belt conveyor 34 carrying out the extraction and volumetric dosing of the granules of the hopper 20 which are driven by the conveyor 34 to above the inlet opening 15 of the mixer 35 in which the aggregates brought by the conveyor 34 fall down The drive rollers of the conveyor 34 are rotated by a

  hydraulic motor that has not been shown.

  In the opening of the mixer 35 also discharges in measured quantities the powder contained in a storage hopper 36 At its lower part 20 the hopper 36 comprises a refocusing screw 37 and a metering-valve device 38 allowing the spill in quantities dosed powder (which is here cement) in the mixer 35, at the same time as the aggregates 27 The slitter and metering device 38 is rotated

by a hydraulic motor.

  As can be seen in FIG. 4, the kneader 35 is a conventional twin-shaft kneader which receives its upper opening, together with the aggregates and the pulverulent material, the bituminous emulsion via a pipe 40, the water through a pipe 41 and the liquid additive facilitating the coating by a pipe 42 For this, the pipe 40 30 is connected by a pipe and a pump to the lower part of the tank 43 containing the emulsion, arranged on the side of the hopper 20 and visible in Figure 3 The tubing 41 is connected via a pipe and a pump to the lower part of the reservoir 44 containing the water equally arranged on the side of the hopper 20 and visible in Figure 3 Finally,

  the tubing 42 is connected by a pipe and a pump to the lower part of the tank 11 containing the liquid additive promoting the coating of the granulate.

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  We will see later in the description that all

  liquid dispensing pumps and all the hydraulic motors driving solids extractors are driven at a speed proportional to the speed of movement of the machine.

  The volumeric dosing of the various elements introduced into the mixer to form the asphalt concrete is therefore perfectly ensured regardless of the speed of movement of the machine -on site

  In addition, the speed of the aggregate extractor 34, the powder metering slider 38 and the metering pump of the bitumen emulsion can be varied to change the compositional setting of the asphalt concrete.

  At its outlet end the mixer 35 comprises a pouring chute bituminous concrete 45 disposed above a finisher device 46 for forming the layer of asphalt 8 on the floor 7 of the chan15 tier The device 46 can be coupled to the It can also be lifted by means of a jib crane allowing it to be lifted up so that it can rest on the chassis. The work performed by the machine can be controlled by an operator placed on the chassis. on a platform 47 (see Figure 4) located at the rear of the

  machine and on which is placed the control panel 48 of the various parts of the machine that are not automatically controlled.

  FIG. 5 shows a schematic representation of the motorization assembly of the machine which comprises in particular the thermal motor 5 and the gearbox 6. Between the engine 5 and the gearbox 6 are interposed a clutch 50 and a power take-off. force 51 whose output is coupled by a cardan transmission 52 to the input of a mechanical distribution box 53 The outputs of this mechanical distribution box of which only two have been shown allow the drive of variable flow hydraulic pumps The variable flow hydraulic pump 55 feeds a constant flow hydraulic motor 56 which is itself connected to an output 58 of the gearbox via a mechanical gearbox 57 and a geared motor. a cardan transmission 59 A second output 60 of the gearbox is connected directly to the rear axles 3 and 3a of the machine via a cardan transmission 61 A hydraulic control circuit 62 provided with actuators 63 on

2550 Z 48.

  the input of the gearbox and 64 on the output of the box 58 makes it possible to establish a transmission between the engine-thermal engine 5 and the driving bridges 3 and 3a of the machine, either directly by the gearbox 6 between its inlet 65 and its outlet 60 or via the outlet 66 of the PTO 51, the mechanical distribution box 53, the pump and the hydraulic motor 55 and 56, the mechanical gear 57, the outlet of'

  box 58 and finally the output of gearbox 60.

  In the first case, the transmission between the heat engine 5 and the bridges 3 and 3 is conventionally carried out by a gearbox with several gears enabling the machine to be driven on the road at a speed of up to 60 km. / hour or above In the second case, the passage through the hydraulic transmission allows a movement of the machine at a very slow and constant speed on the site, a ratio of the gearbox being chosen to obtain 15 speed This speed very slow can be between 700 meters

per hour and 3 km / hour.

  The outputs of the mechanical distribution box apart from those for driving the pump 55 for the slow-speed movement of the vehicle are connected to hydraulic pumps such as 54 which themselves feed the hydraulic motors of the various devices.

  extraction and dosing of the machine and the various feed pumps that have been described above.

  The driving speeds of these metering extractors and of these pumps depend on the flow rate of the hydraulic pumps 54, which itself is dependent on the speed of rotation of the motor. The same is true of the drive. of the machine itself so that the speed of the extraction and dosing devices and the flow rate of the liquid dosing pumps are constantly proportional to the speed of movement of the machine on site The setting of the different dosages is so done once for

  all at the start of the construction site and does not require subsequent modifications.

  It is understood that the operation of the machine can be described in the following way: The machine is brought to the site by a normal road circuit since its dimensions correspond to the accepted road standards and on the other hand its total empty weight is 26 tonnes In road transport, the transmission is done only by the gearbox 6, which allows a movement at normal speed On the site, the machine undergoes no change in structure but the storage capacity of

  various materials must be filled before start-up.

  In particular, as shown in FIG. 1, the ben5 28 of a truck is brought into the loading position of the aggregates in the receiving hopper 14. This completes the filling of the aggregate hopper 20. released from the fastening device 29 and 30, the truck starts empty and the coupling of the following truck is carried out to ensure continuous refueling during the operation of the mna10 chine The filling of the other capacities is also carried out (Emulsion

  bituminous, water, additives, cement,).

  When all the storage capacities are satisfied, the weight

of the machine is 56 tons.

  The hydrostatic transmission that can be used on the construction site is then put in the active position thanks to the hydraulic circuit 62. A slow speed of movement of the machine is chosen and the dosages of the various materials are defined according to this slow speed and the weight.

  per m 2 of material to spread on the road 7.

  The work on the site can then begin and continue in a continuous manner. The capacity of the storage hopper 20 also allows considerable autonomy for the machine, the storage capacities for the other materials being chosen so as to correspond to a number

  exact loads of the aggregate hopper.

  It can be seen that the main advantages of the device according to the inven25 tion are that it can move on road and on site without any modification of structure, that it still has a large autonomy with respect to the replenishment of aggregates and that It requires for its drive a single heat engine ensuring fast speed and slow speed movements as well as the training of the various dispensing and extraction devices at a speed proportional to the speed.

  slow movement of the machine.

  The invention is not limited to the mode of realization that comes

  to be described; on the contrary, it contains all the variants.

  Thus, the bucket elevator of the self-feeding device can make an angle other than 60 with the plane of the frame, this

  However, the angle must be greater than 45 in order to take full advantage of this solution.

  The device for distributing aggregates can be adjustable in

  height inside the granular storage hopper; this device can even be made mobile in the vertical direction from bottom to top to ensure the spreading of aggregates during the filling of the hopper.

  The finishing device of the coating can be placed in position 5 raised and fixed on the chassis for the transport on road between sites.

  It can be suspended from a gallows and placed in road position on the

back platform of the machine.

  The position of the different tanks and storage capacities

  may be different from that which has been described, the aim being to minimize the bulk of the machine for a given capacity of the aggregate hopper.

  Finally, the hydrostatic transmission for the movement of the device at a slow speed and for driving the various extraction and dosing members may be different from that which has been described.

  The invention applies to the cold processing on the site

  coated bituminous products for road surfaces.

he

Claims (6)

  1. Mobile device for cold forming and on-site spreading of bituminous asphalt products for road surfaces during the slow moving of the device which is also capable of traveling on high speed road and which has a chassis (1) mounted on wheels (2) carrying a large aggregate storage hopper (20) associated with a feed device having a receiving hopper (14) disposed at the front and bottom of the device, storage capacities of pulverulent material (36), water (44), bituminous emulsion (43) and additives (11) and means for taking the materials in their storage capacity in metered quantities and supply of these materials to a mixer (35) also carried by the frame, ensuring the mixing and pouring of the products on the ground continuously, characterized in that the feeding device in gr blanks comprises: a bucket elevator (12) for conveying the aggregates (27) between the receiving hopper (14) and the upper part of the aggregate storage hopper (20) whose inclination with respect to the chassis plane (1) '20 is greater than 45, and a device for distributing the aggregates (31) along the length and the width of the storage hopper (20) placed above this hopper (20) and comprising at least one chain endlessly movable (21) in a substantially horizontal direction and corresponding to the longitudinal axis lon25gitudinal of the frame (1) over the entire length of the storage hopper (20) carrying transverse bars (23) whose length substantially corresponds to the width of the storage hopper (20) which is itself   only slightly less than the width of the frame (1).   2. Mobile device according to claim 1, characterized in that the 4 bucket elevator (12) is an angle close to 60 with the plane of the frame   Mobile device according to one of the claims   1 and 2, characterized in that the granulator distribution device (31) above the storage hopper (20) has an adjustable position in the vertical direction inside the hopper   4. Device according to any one of claims 1, 2 and 3, 2550-248   characterized in that the receiving hopper (14) comprises a screw   transversal recentering (16) having two parts with opposite pitch.   Mobile device according to one of the claims   1, 2, 3 and 4, characterized in that it comprises a single drive heat engine (5) carried by the frame (1) kinematically connected to the driving bridges (3) of the driving wheels (2) of the device on the one hand via a clutch (50) and a gearbox (6) and on the other hand, via the clutch (50), a hydraulic pump ( 55) 10 of a hydraulic motor (56) and a gearbox (6), one or the other of the kinematic transmission chains can be activated by a hydraulic control (62) for the movements of the device on road to   high speed and on the job site at slow speed, respectively.   6. Mobile device according to claim 5, characterized in that the means for sampling materials in   their storage capacity in metered quantities are driven by the heat engine (50), by means of hydraulic pumps (54) and hydraulic motors, so that their speed and their flow rate are proportional to the speed of rotation of the engine (5) and at the slow speed of movement of the device on the site.