WO1981003352A1

WO1981003352A1 - Process and device for removing the paving of a road and laying a new paving

Info

Publication number: WO1981003352A1
Application number: PCT/DE1980/000073
Authority: WO
Inventors: R Wirtgen
Original assignee: Wirtgen Reinhard
Priority date: 1980-05-20
Filing date: 1980-05-20
Publication date: 1981-11-26
Also published as: AU5984180A

Abstract

To renew the paving of a road, the coating is removed or milled, the material is collected, optionally heated and mixed with complementary material and finally set in place. Before laying this new coating, the milled or removed surfacing is heated. The device, carried by a frame, comprises a removing unit (5), a heating device (11) for the removed material, a device for collecting said material (12), a mixer (13), a supply tank (15) for the complementary material, with a carrier belt (17) for the metered supply of the mixer, a heating device for the removed or milled paving, and a laying unit (20) combined with a flattening screw (19) for the material removed and mixed with the complementary material. The mixer (13), arranged under the frame (1), optionally heated, has two bladed cylinders oppositely arranged in a casing provided with a supply opening in the feed direction and with an open bottom towards the coating of the road. The collecting device (12) leads the material removed to the mixer (13). It comprises a metal sheet channel or a conveyor screw connected to a helical brush or a suction operated device.

Description

Method and device for removing and re-coating road surfaces

The invention relates to a method for removing and re-coating road surfaces, in which the surface of the road surface to be renewed is peeled off or milled off and then re-coated.

Various methods have already been developed for repairing road surface damage, in particular that caused by studded tires.

To repair the track groove area, the bitumen-like road surface in the track groove area is milled to the required depth using milling machines and the milled area by applying fresh bituminous material Road surface material repaired again. However, such a measure is only a temporary remedy for the damage.

In another method, the surface of the bituminous road surface layer is milled to the required depth using a milling device up to approximately 4.00 meters wide, the milled material is transported to landfills by truck and then a new road surface made of new bituminous road surface material is applied in a conventional manner.

In addition to the fact that valuable raw materials are lost in this process and have to be transported to landfills in a costly manner, this process also has the disadvantage that it is very time-consuming and thus the traffic for a long time through the construction site and the site traffic for the removal of the milled material and the transport of the new material is hindered. In addition, the deposition of the milled bituminous material in landfills is increasingly causing problems due to environmental pollution.

In the still known asphalt surface regeneration process, the old bituminous surface is heated in a first step and the heated layer is then torn open with the help of fangs. Immediately behind the fangs, the loosened material is evenly distributed over the processed road surface using a distribution device and then pre-compacted. In a subsequent work step, an additional top layer of new material is then applied using a conventional paver.

With this method, the costly removal of the milled material is eliminated, since the old bituminous material However, if the mix has to be reused in an unchanged composition, this method can only be used in cases where the old existing pavement cover has a material composition that meets modern requirements.

Unfortunately, this is only in the rarest of cases, so that the application of this process and the repaving process developed from it, in which the aforementioned steps of heating, milling, distributing, compacting and, if necessary, coating with new road surface material, are only restricted to individual cases , because the old road surface material usually has compositions that no longer meet the requirements of modern road traffic.

It is an object of the present invention to provide a method of the type described which can largely be used in all conventional road surfaces, regardless of their composition, and in which the repair is carried out in a few, preferably only one, operation, the milled old road surface material largely is reused, so that the extensive transport measures are no longer necessary and road traffic is only hindered to a limited extent by the repair work at short notice.

This object according to the invention is achieved with a method for removing and re-coating road surfaces, in which the surface of the road surface to be renewed is peeled off or milled and then re-coated, which is characterized in that the milled material is collected, heated if necessary and mixed with additives and then is installed to the new ceiling.

The old cover layer can be removed to the required depth by milling or peeling, whereby The surface of the road surface is expediently heated beforehand in order to plasticize it, in order to facilitate removal and in particular to reduce the wear of the milling or peeling devices.

The peeling off of the old surface of the road surface has proven to be more advantageous for the method according to the invention, because it does not result in the grain crushing that occurs during milling by breaking up the mineral constituents, so that the structural composition of the peeled material, as far as binders and mineral constituents are concerned, is due to the peeling process remains largely unchanged.

The method according to the invention thus allows the composition of the milled road surface material to be varied within wide limits by admixing additives.

According to an advantageous embodiment of the method according to the invention, the peeled and collected material is mixed with the additives missing for the desired new road surface and then installed into a new surface.

Although in many cases the appearance of the old road surface already reveals its composition and the missing component (binder or mineral constituent) can be added in the process according to the invention, in many cases such an improvement in the material to be reinstalled does not prove to meet the requirements of modern road construction.

In order to achieve highly wear-resistant and heavy-duty road surfaces, especially for the construction of highways, compliance with very tight tolerances is particularly important with regard to the binder and the grain composition of the mineral constituents.

These requirements are met by a particularly advantageous embodiment of the method according to the invention, which is characterized in that, before milling, the composition of the road surface to be renewed is determined by sampling and analysis, and then the missing components are added to the peeled and collected road surface material and the same is then hewn into a new floor .

With the aid of this method according to the invention, new road surfaces can be created with practically complete use of the milled material, the properties of which practically do not differ from road surfaces that have been produced from completely new coating material.

If the surface of the road surface is peeled off with the surface being heated beforehand, the peeled material is already obtained in the heated state. Otherwise, when cold peeling, the milled material is only at ambient temperature.

It has now proven to be advantageous according to the present invention if the milled material is mixed with the additives in the heated state. Accordingly, according to a further advantageous embodiment of the present invention, the milled material can be heated before mixing or during mixing, in order to then be installed directly as a new road surface when heated. The collected and, if necessary, newly heated material is therefore fed to a mixer arranged on the undercarriage of the milling machine and mixed there with the additives required for the desired new road surface and then in the hot state. was built into the new road surface using a conventional installation device (paver), which either connects directly or follows as a separate unit.

According to another advantageous embodiment of the method according to the invention, the milled road surface is subjected to heating before the reprocessed material is installed. It has been shown that the adhesion of the applied material to the milled road surface is significantly improved by such heating.

The milled road surface can be heated appropriately using the Sas emitters that are customary for this purpose.

The advantages of the method according to the invention result primarily from the fact that road surfaces are milled with an arbitrarily composed bituminous top layer and, while changing and adapting the mixture composition of the milled material, to the requirements of modern road construction. the same can be reused as a new mix for the production of the new road surface layer. It is therefore possible to compensate for missing or excess amounts of binder, minerals, etc. in the milled material and to influence the composition of the mix so that a mix is created that corresponds to the latest aspects of road construction. The repaving process, which has so far only been used for very special cases, can therefore be widely used in the form modified according to the invention and thus enables the damaged road surfaces to be repaired quickly, valuable raw materials being reused and the flow of traffic being repaired only slightly disturbed . The present invention further relates to a device for carrying out the method according to the invention for removing and re-coating road surfaces, which consists of a peeling or milling unit arranged on a preferably self-propelled undercarriage, a collecting device for the peeled or milled material and, if necessary, an adjoining installation unit exists for the new order of the road surface material. The device according to the invention is characterized in that, following the collecting device for the milled material, a mixer is provided in which the peeled or milled material can be mixed with additives for reinstallation.

Such a device can have an upstream heating device for hot peeling or hot milling, which can consist of gas radiant heaters in the usual known manner.

According to a further advantageous embodiment of the device according to the invention, one or more storage containers for the additives with a subsequent metering device and transport device to the mixer are provided on the chassis. Such a storage container enables the required additives to be continuously mixed in without a vehicle traveling alongside blocking the second lane at the same time.

According to a further embodiment of the present invention, it has proven to be advantageous if the metering and transport device consists of an adjustable discharge opening on the storage container and a transport belt which can be varied in speed, as a result of which the additive can be fed continuously to the mixer. It has proven to be particularly advantageous if the speed of the conveyor belt can be controlled by the feed speed of the machine. This can be done, for example, in that the conveyor belt is driven directly by a chassis wheel via a suitably designed drive shaft, possibly with the interposition of a corresponding reduction gear or a controllable gear. In this way, the amount of the additive determined in its composition according to the analysis carried out can be metered quite precisely in a simple manner, since the amount of the milled material is relatively exactly proportional to the milled distance over the entire milling width.

The changes in the milling depth made during the milling operation can be very easily compensated for via the adjustable drive and the resulting change in the speed of the conveyor belt.

According to an advantageous embodiment of the present invention, the collecting device for the milled material consists of two V-shaped guide plates which open into the mixer opening. The material is transported through these baffles from both sides of the milled surface to the center and thus goes directly into the mixer, which may also be equipped with a special conveyor.

According to another advantageous embodiment of the present invention, the collecting device consists of two opposing transport screws arranged transversely to the direction of travel, which expediently coat half of the milled road surface and also deposit the milled material in the middle. According to another advantageous embodiment of the present invention, the collecting device consists of a transport screw arranged transversely to the direction of travel and having two screw halves running in opposite directions. With such an embodiment, the same purpose is achieved, ie it collects in the middle, where it can easily be taken up by the mixer.

Since when using screw conveyors for clearing the milled or peeled material, the fine-grained particles are generally not cleared away and remain on the milled road surface, according to a further advantageous embodiment of the device according to the invention there are one or two following the screw conveyor (s) Snail broom arranged. The same expediently have helically arranged brushes which, when the screw brooms rotate, also transport the small-part material to the center, so that it can also be mixed with the additives in the mixer and then reinstalled. Such clearing of the small-part milled material is very advantageous for later adhesion of the newly applied material.

According to another advantageous embodiment of the device according to the invention, the collecting device for the milled material consists of a vacuum suction device which acts over the entire milled or peeled width and with which the entire milled or peeled material, including the fine-grained particles, is suctioned off and expediently transported directly into the mixer .

Of course, instead of one vacuum suction device acting over the entire width of the milled surface, two vacuum suction devices each acting on one half of the area can also be used Find application.

The mixing of the milled material with the additives is expediently carried out in the heat, as already mentioned at the beginning. Even if the road surface has been heated before the milling or peeling, the milled material is obtained in the relatively hot state and can be fed directly into the mixer in this form, it proves to be advantageous according to a further embodiment of the present invention if an additional heating device is provided for the milled material, with which the same can be brought to a constant temperature for the early mixing. In this case, an optimal mixture of the milled material with the aggregates is always achieved and the new mix to be installed is also obtained in the hot form that is usually required for paving, whereby the required plasticity is achieved and the good connection with the milled road surface is achieved,

According to another advantageous embodiment of the present invention, the mixer itself is provided with a heating device for the material to be mixed.

Any type of mixer can be used as a mixer for the milled road surface material and the additives. However, it has proven to be particularly expedient if the mixer consists of a compulsory mixer with two mixer flight rollers running counter to one another in a housing.

On the other hand, a conventional drum mixer (mixing drum rotating about a horizontal axis) can of course also be used. In the latter embodiment, however, the loading of the material accumulated on the surface of the road surface is not very easy, because the loading occurs at the upper edge of the drum and consequently the material has to be transported from the road surface into the drum by means of a transport device.

In the above-mentioned compulsory mixer, the mixer opening can be provided directly on the milled road surface, and the milled material can be picked up via a corresponding push plate during the forward movement of the device and pushed directly into the mixer.

For the additives, a further loading opening is then expediently provided at the upper edge of the mixer, which advantageously has the shape of a filling funnel.

According to another advantageous embodiment of the present invention, the mixer is arranged under the chassis with the filling opening open in the direction of travel and it has a floor open to the road surface. This means that the material remains directly on the street surface and is gripped by the mixer blades and mixed with the additives. The mixer housing only prevents the materials to be mixed from escaping laterally.

Since the adhesion between the newly applied top layer and the milled road surface is better, even if the milled road surface is at an elevated temperature, according to a further advantageous embodiment of the present invention, a heating device is provided for heating the milled or peeled road surface before the new coating. This heating device expediently consists of the gas emitters usually used for such purposes.

The ready-to-install material generated in the mixer can be installed in a subsequent paving device (conventional paver) to the new pavement. According to a particularly advantageous embodiment of the present invention, however, an installation device for the milled material is provided directly on the chassis behind the mixer.

Such a device according to the invention therefore enables the peeling, collecting, admixing of the aggregates and the ready installation of the new road surface in one work step, so that a continuous work flow is ensured and the replacement of the damaged road surface surface is possible with minimal disruption to the flow of traffic.

In particular, if the above-mentioned compulsory mixer is used as the mixer, which mixes the milled material with the additives directly on the road surface, it has proven to be expedient if a leveling screw is provided in front of the coating device (paver unit) provided at the end of the undercarriage which distributes the material mixed with the aggregates evenly for installation over the road surface.

The invention is explained in more detail below with reference to the exemplary embodiments illustrated in the accompanying drawings.

The drawings show: Figure 1 is a side view of an inventive device for milling and re-coating of road surfaces;

Figure 2 shows an inventive device for peeling and re-coating of road surfaces;

Figure 3 is a schematic side view of the mixer used in the inventive device;

Figure 4 is a front view in section of the mixer used in the device according to the invention.

The device shown in Figure 1 for milling and re-coating of road surfaces consists of a chassis 1 with a steerable pair of front wheels 2 and a pair of rear wheels 3, which is driven by a motor 4.

On the chassis 1, a milling drum 5, which is provided on its two end brackets 6 with support wheels 7, is height-adjustable. A heating device 8, viewed in the direction of travel, is also arranged in a height-adjustable manner in front of the milling drum 5 on the undercarriage 1 and is fed via the line 9 with liquid gas which is removed from the storage container 10. When viewed in the direction of travel, a second heater 11 is arranged behind the milling drum 5 and is likewise fed with liquid gas from the container 10. This heater 11 serves to further heat the material milled by the milling drum 5, which is deposited behind the milling drum 5 and is deposited by the transport screw 12 with two counter-rotating screw halves in the middle of the milled road surface.

The milled material thus deposited is taken up by the mixer 13 arranged on the chassis 1 and ge in this mixer 13 with the additive required for the production of the desired road surface material mixes. This additive 14 is tilted by truck into the pivotable storage container 15, which is then pivoted hydraulically, so that the additive 14 reaches the conveyor belt 17 via the adjustable discharge opening 16 and falls from there through the funnel-shaped opening 18 into the mixer 13.

After intimate mixing with the additive 14, the milled material leaves the mixer 13 and is evenly distributed over the milled road surface by the leveling screw 19 and installed as a new road surface by means of the installation device 20 (paver).

The mixer blades used in the mixer are driven by two hydraulic motors 21 arranged at the rear end of the mixer.

The embodiment of the present invention shown in FIG. 2 relates to a device for peeling and re-coating road surfaces. With the exception of the peeling device 22, which consists of height-adjustable peeling devices that peel the road surface to be queried at a predetermined depth, this device according to FIG. 2 corresponds in its other embodiment completely to FIG. 1 described above.

In Figure 3, the mixer 13 is shown enlarged again. At its left end, the hopper 18 is provided for the aggregate, while at its right end the mixer blades are each driven by a hydraulic motor 26 acting via an angular gear 25.

FIG. 4 shows a special embodiment of the mixer shown in cross section. The two mixer blades 23 and 24 are arranged in a housing open to the road surface. The milled material cleared by the screw conveyor 12 automatically reaches the area of influence of the two mixer blades 23 and 24 and is intimately mixed together with the aggregate introduced via the hopper 18 and then, after leaving the mixer 13, is evenly distributed by the leveling screw over the milled road surface .

The side walls 27 and 28 of the mixer housing can be adjusted with respect to one another with the aid of the threaded spindles 29 provided with left and right hand threads and the associated adjusting ratchet 30.

In this way, the mixing intensity of the mixer can be varied.

Claims

PATENT CLAIMS

1.Procedure for removing and re-coating of road surfaces, in which the surface of the road surface to be renewed is peeled off or milled off and then re-coated, so that the milled material is collected, heated if necessary and mixed with additives and then installed to the new surface.

2. The method according to claim 1, so that the peeled and collected material is mixed with the aggregates missing for the desired new road surface and then installed into a new surface.

3. The method according to claim 2, characterized in that prior to milling, the composition of the road surface to be renewed determined by sampling and analysis and then the peeled and collected road surface material The missing components are mixed in and the same is then installed into a new ceiling.

Method according to one of claims 1 to 3, characterized in that the peeled, collected and possibly newly heated material is placed in a mixer arranged on the chassis and mixed therein with the additives missing for the desired new road surface and then installed with an installation device for the new road surface becomes.

Method according to one of claims 1 to 4, that the milled road surface is subjected to heating before the new material is installed.

A method according to claim 5, so that the milled road surface is subjected to heating with gas jets prior to installation.

Apparatus for carrying out the method according to one of claims 1 to 6, consisting of a peeling or milling unit arranged on a preferably self-propelled undercarriage, a collecting device for the peeled or milled material and, if appropriate, an adjoining installation unit for the new application of the road surface material, characterized in that following the collecting device (12) there is a mixer (13) in which the peeled or milled material can be mixed with additives (14) for reinstallation.

8. The device according to claim 7, characterized in that on the chassis (1) one or more storage containers (15) for the additives (14) with subsequent Do sier- (16) and transport device (17) to the mixer (13) is provided .

9. The device according to claim 7 and / or claim 8, characterized in that the metering (lβ) and transport device (17) from an adjustable carrying opening (16) on the storage container (15) and on a variable in its speed conveyor belt (17th ) consists.

10. The device according to claim 9, so that the speed of the conveyor belt (17) can be controlled by the feed speed of the milling or peeling device.

11. The device according to one or more of claims 7 to 10, that the collecting device (12) consists of two V-shaped guide plates which open into the mixer opening.

12. The device according to one or more of claims 7 to 10, d a d u r c h g e k e n n z e i c h n e t that the collecting device consists of two opposing transport screws (12) arranged transversely to the direction of travel.

13. The device according to one or more of claims 7 to 10, characterized in that the collecting device from a transverse to the direction of travel arranged transport screw (12) with two counter-rotating screw halves.

14. Device according to one of claims 12 or 13, so that one or two screw brooms are arranged after the transport screw (s) (12).

15. Device according to one of claims 7 to 10, so that the collecting device consists of a vacuum suction device that acts over the entire milled or peeled width.

16. The device according to any one of claims 7 to 15, that a heating device (11) is provided for the milled material.

17. The apparatus of claim 16, so that the mixer (13) is provided with a heating device for the material to be mixed.

18. Device according to one of claims 7 to 17, so that the mixer (13) consists of a compulsory mixer with two mixer vane rollers (23, 24) running counter to one another in a housing (27, 28).

19. The apparatus according to claim 18, characterized in that the mixer (13) is arranged under the chassis (1) with the opening open in the direction of travel.

20. The apparatus of claim 19, so that the mixer (13) has a floor open to the road surface.

21. Device according to one of claims 7 to 20, that a heating device is provided for heating the milled or peeled road surface before the new coating.

22. The apparatus of claim 21, d a d u r c h g e k e n n z e i c h n e t that the heating device consists of gas emitters.

23. The device according to any one of claims 7 to 22, so that an installation device (20) for the milled material is provided on the chassis (1) behind the mixer (13).

24. Device according to one of claims 7 to 23, that a leveling screw (19) is provided in front of the installation device (20).