WO2012003990A1

WO2012003990A1 - Process for producing a noise-reducing damping layer and a further layer arranged on the damping layer for a roadway

Info

Publication number: WO2012003990A1
Application number: PCT/EP2011/003403
Authority: WO
Inventors: Erwin Fleischer
Original assignee: Kemna Bau
Priority date: 2010-07-09
Filing date: 2011-07-08
Publication date: 2012-01-12
Also published as: DE102010026744A1; DE112011102302A5

Abstract

Process for producing a noise-reducing damping layer and a further layer arranged on the damping layer for a roadway, in which process, in a first step, either - a layer of elastic granules and at least one layer of bitumen or another binder are applied separately using at least two devices in succession in the installation direction to form the damping layer, or - a mixture of bitumen or another binder and elastic granules is applied as the damping layer using a suitable device, and in a second step, which follows after a short interval, the further layer of the roadway superstructure is built over the damping layer, and device for carrying out the process.

Description

A method of producing a noise reducing cushioning layer and another layer on the cushioning layer for a roadway

The invention relates to methods according to claim 1 for the production of damping layers for roads as well as to a paver used in this method according to claim 10.

Usually roads consist of a multi-layer road superstructure, which is applied either on a previously created unbound road substructure or directly on the ground (Planum). The upper layers consist of differently bound aggregates with different largest grain size.

A typical asphalt superstructure consists essentially of an upper asphalt surface course with aggregates of relatively small largest grain size, optionally an underlying asphalt binder course with a slightly coarser grading curve and at least one asphalt surface bounding the asphalt surface.

CONFIRMATION COPY phalttragschicht, which is composed mostly of even coarser aggregates.

The bound superstructure can z. As with asphalt but also with concrete, being used in the first case as a binder bitumen or bituminous binder and cement in the second case.

The unbound superstructure usually consists of compacted beds of different grain sizes and is located below the bound superstructure.

A problem with conventional roadway superstructures is that the tensile loads occurring under traffic lead to deformations of the layers and thus to stresses. In the case of permanent loading, cracking occurs which, as a result, leads to cracking of the cover layer.

To address this problem, such as e.g. in EP 0798417 in the discussion of the prior art, it is known to provide a bitumen / rubber interlayer which is intended to decouple movements of adjacent layers of the road superstructure from one another. The intermediate layer is intended to prevent rising of the cracks up to the top layer of the road.

Another problem with conventional road superstructures is the noise emissions occurring under traffic. In this connection, EP 0672791, again in the discussion of the state of the art, mentions that the addition of rubber to bitumen leads to a mix, the road surface layers produced therefrom, in addition to sound-absorbing properties, further properties such as compliance, fatigue strength and resistance to low temperatures gives. Furthermore, for example, from DE 202 05 590 known to lay in the construction of a road prefabricated sheets of elastic material as a layer.

However, the incorporation of bitumen / rubber layers as an intermediate layer is not without problems. As a rule, layers applied in the course of road production must be able to withstand such loads that they can absorb the heavy load traffic arising during the construction activity for a relatively short time after their installation. This is generally not the case for bitumen / rubber based liners.

When installing the above-mentioned webs, similar problems arise; In addition, the webs can hardly be laid without wrinkles etc., especially when applying the overlying layers.

The object of the invention is, starting from the prior art, to provide a method for the incorporation of elastic granules containing Laäimindernden damping layers in roads, which overcomes the disadvantages described in the prior art.

The problem is solved by a method according to claim 1.

According to the invention, it is provided that for the production of the damping layer with z. B. a conventional paver, a mixture of bitumen or other suitable binder and granules with elastic properties in the installed position is applied.

Suitable other binders may be polyurethane or resin based materials. Bituminous binders are preferably used. Bitumen is preferably used as hot bitumen. Alternatively, it can also be provided that bitumen and elastic granules are applied separately. It would be conceivable, for example, first to spray the substrate with bitumen, then apply a layer of granules and then spray them in a further step, if necessary, with bitumen or other binder and glue. It would also be conceivable to apply the granules to the substrate in a first step and then to apply bitumen or another binder in a second step.

The term "granules with elastic properties" is to be construed broadly It is preferred to use rubber, rubber or tire granules, which can be obtained, for example, from waste tires or the like However, other granules of materials having rubber-like properties, eg B. elastically deformable plastic granules, possibly also with the addition of suitable aggregates.

According to the invention, it is further provided that an overbuilding of the damping layer, which is carried out in particular in the same operation, preferably takes place in rolled asphalt with a further layer of the roadway structure. But it is also possible that this additional layer consists of mastic asphalt or concrete. It is essential that the overbuilding takes place without there being any damage to the damping layer caused by traffic or the like in the meantime. Preferably, both layers are applied as discussed above in a multi-step operation with a road paver described below. It is also conceivable, of course, that both layers are applied with separate devices, but then it must be ensured that during the superstructure of the damping layer this is not damaged.

The damping layer produced according to the invention can be provided in largely arbitrary positions of the roadway structure. It is conceivable z. B. at the above-mentioned conventional roadway structure consisting of asphalt surface course, asphalt binder layer and asphalt base course (seen from top to bottom) to provide the cushioning layer between asphalt binder course and asphalt base course layer. It is also conceivable to separate the asphalt base layer horizontally and to provide the damping layer as an intermediate layer between the two parts of the asphalt base course. However, the damping layer can just as easily be provided below the asphalt base course, and of course it is also possible to provide the damping layer between the asphalt top layer and the asphalt binder layer.

In any case, it can be assumed that the damping layer causes a reduction in noise due to its elastic properties. In particular, according to the invention it also leads to noise reduction if it is not arranged on the surface of the road construction, but - as mentioned - between other layers, because there is also a noise-reducing influence is exerted (resonance-influencing).

As mentioned above, the damping layer consists of a mixture of granules with bitumen or other binder, in particular bituminous binder, wherein the granules must have elastic properties. It is preferably provided that the diameter of the granules used is between 2 and 20 mm.

Accordingly, the preferred thickness of the damping layer produced according to the invention ranges between 2 and 30 mm.

The bitumen fraction - if bitumen is chosen as binder - can consist of either hot bitumen or a bitumen emulsion. The advantage of using hot bitumen is that immediate overbuilding with another layer in all above-mentioned positions of the road Superstructure is possible. When using bitumen emulsions, the water contained in the emulsion must first be removed from the layer, which is usually done by surface evaporation. A direct overbuilding is therefore only possible if there is the possibility that the water can escape despite the overbuilding.

As mentioned above, there are two different ways to incorporate the cushioning layer. The first option is to first place the pad z. B. to spray with hot bitumen, then apply a layer of granules and immediately afterwards with bitumen, either hot bitumen or a bitumen emulsion, or another binder to spray and stick.

The second option is to apply a mixture of bitumen or other binder and granules. In this possibility, the mixture of granules and binder, e.g. turn in place, done in an appropriately equipped facility. It is also conceivable that the mixing elsewhere, z. B. in a central mixing plant, and then the finished mixture is transported to the place of installation.

Which variant is chosen depends essentially on the respective requirements of the damping layer and logistic factors. It can be assumed that the coating of the granulate with bitumen or another binder in a mixture is better than with separate application of granules and binder and that the application of such a mixture leads to an overall more homogeneous and holraumarmeren damping layer than in the other variant. On the other hand, the preparation of the mixture requires additional steps. As already mentioned above, the invention also relates to devices with which the damping layer according to the invention and a further layer can be applied.

For the variant of the method according to the invention in which a mixture produced in situ (i.e., at the place of installation) is applied as a cushioning layer, a paver may be used comprising a binder tank, an elastic granule bunker and an asphalt bunker. Furthermore, the paver must have a mixer to make the mixture of binder and granules in situ, as well as built-in devices with which the layers are applied. A suitable for the application of the damping layer mounting device must be able to apply the granules / binder mixture as evenly as possible and in a constant thickness on the substrate, while for the asphalt layer a conventional asphalt pavement can be provided as a mounting device. Of course, it is not necessary that binder, granules and asphalt are kept together in the paver, because the asphalt mix is fed to the paver via the receiving bucket.

For the variant in which the granules and the binder are applied separately, a differently adapted paver would have to be used. The mixer could be omitted, and the paver would have instead of the above-mentioned mounting device for applying the finished granules / binder mixture a scattering device for the granules and a spray for the hot bitumen or the binder. If it is desired to submit a further bituminous layer or binder layer for spraying the substrate prior to the application of the granules, a further spraying ramp would have to be provided in the paver. Both devices described allow the application of the damping layer and the further layer in a multi-stage operation in such a way that the damping layer is exposed to no or only acceptable direct loads.

It is of course also conceivable that the layers in question are applied with separate facilities. In the prior art so-called DSK laying machines are known with which thin asphalt layers can be applied in cold installation. The production of the applied mixture of granules and bitumen emulsion takes place in the machine. It is to be assumed that known DSK laying machines can be used without or in any case without appreciable conversion for the application of the mix of elastic granules and a bituminous emulsion or another binder for the production of the noise-reducing damping layer. In this case, it would only have to be ensured that no damage to the damping layer occurs between the production of the damping layer and the superstructure with another layer and that the superstructure itself likewise takes place without impairing the damping layer.

The process according to the invention will be explained in more detail below with reference to two examples:

Example 1

Applying a mixture of binder and elastic granules prepared in situ as noise-reducing intermediate layer.

Elastic (eg made from used tires) granules of suitable composition and grain grading is added with the addition of reaction accelerators and z. B. polymer-modified bitumen emulsion in situ in a DSK laying machine mixed and then applied with the machine cold or up to 75 degrees Celsius warm to the substrate. The required amount of pure binder may be between 4.0 and 1 1.5 mass%.

The damping layer produced in this way can be adjusted to a thickness between 0.2 and 3.0 cm, depending on the largest particle size of the granulate.

The overbuilding of the damping layer with another layer can take place as soon as the water has escaped from the emulsion. It is also conceivable to use a special emulsion whose breaking behavior is controlled so that the water evaporates ad hoc. In this case, or in the event that the water can escape despite the overbuilding, an immediate overbuilding of the damping layer would be possible with another layer.

Example: 2

Production of a noise-reducing intermediate layer by separate application of granules and binder

In a first step, the pad with binder, z. As hot bitumen, in an amount of 800 gr / m ² - 3000 gr / m ² vorbesprüht.

Immediately thereafter, in a second step without passing through the layer thus produced, a mixture of elastic, for. B. consisting of rubber, material of suitable composition and grain grading, if necessary, applied together with suitable graded aggregate in particle sizes of 0/5, 0/8, 0/1 1 or 0/16 mm.

In a third step within this operation, binder is again sprayed in an amount of 800 g / m ² - 2500 gr / m ² . The application of the binding demittels takes place at temperatures between 120 and 200 degrees Celsius, if bitumen is chosen as a binder. The total thickness of the resulting noise-reducing intermediate layer may be between 0.2 and 3.0 cm, depending on the largest grain size of the materials used.

In a fourth step, in turn, without intermediate driving of the damping layer, the overbuilding can take place with a further layer.

It is understood that modified bitumen or bitumen emulsions or other binders can be used instead of standard hotbrooms.

The figures used for further explanation of the invention show:

Fig. 1 a-c schematically conventional road structures with each differently positioned damping layer and

Fig. 2 is a usable in the process according to the invention road paver in a schematic representation.

In Fig. La, a roadway structure is shown, seen from top to bottom, an asphalt surface layer 10, an Asphaltbinderschicht 1 1 and an asphalt base 12 has, which in turn rests on an applied on the substrate 15 unbound road superstructure 14. Above the asphalt base layer 12, the damping layer 13 produced according to the invention is provided, which in this case was installed immediately in front of the asphalt binder layer 11. In the exemplary embodiment shown in FIG. 1a, hot bitumen is used as the binder for the damping layer. Fig. Lb shows another example of a roadway structure, in which a damping layer 13 may be incorporated according to the inventive method. In this case, the cushion layer is provided as an intermediate layer between two layers 12a and 12b of the asphalt base course.

Finally, another example is shown in FIG. Here, the cushion layer 13 is positioned below the asphalt base 12.

In Fig. 2, a retrofitted paver 20 is shown schematically, which allows simultaneous installation of a damping layer and a further layer arranged thereon. As shown, the paver 20 has three mounting devices 21, 22, 23 and a screed 24. With the installation device 21, a base 26 with binder 27 is first sprayed onto the substrate 32 from the road paver 20 moving in the direction of construction 25. Then, with a mounting device 22, a layer of z. B. consisting of rubber granules 28 suitable composition and grain grading, if necessary, applied together with suitable graded aggregate. The applied granulate 28 is then sprayed with the mounting device 23 again with binder 27, and it forms a bound, consisting of binder and granules damping layer 29, which in turn is overbuilt with the screed 24 immediately with an asphalt layer 30.

The paver 20 shown can be made, as mentioned above, by modification of known road pavers. As mentioned, there are road pavers that allow the simultaneous installation of two layers, usually the Asphaltbinderschicht and the asphalt surface layer in the "hot" installation in the so-called compact design. These pavers have a first screed for applying the asphalt binder course and a second screed for the asphalt surfacing. It would be conceivable z. B., as mentioned above, that one granules and binder already premixed with a possibly modified first screed brings. Then, in the paver, it may be necessary to additionally provide a mixing device if the mix is not already premixed. It is of course also conceivable to replace in such devices, the first screed by the installation devices shown in Figure 2, with which the components 28 (granules) and 27 (binder) can be installed separately.

Claims

PATENT CLAIMS:

1. A method for producing a noise reducing cushioning layer and another layer on the cushioning layer for a road,

in the first step either

- With at least two successive in the installation direction means a layer of elastic granules and at least one layer of bitumen or other binder to form the damping layer are applied or applied a mixture of bitumen or other binder and elastic granules with a suitable device as a damping layer becomes and in a second step, which follows at a short time interval, the damping layer is overbuilt with the further layer of the road superstructure.

2. The method according to claim 1, characterized in that the binder is hot bitumen, a bitumen emulsion or bituminous binder.

3. The method according to claim 1 or 2, characterized in that the damping layer is exposed to the overbuilding with a further layer no they possibly destructive loads.

4. The method according to any one of claims 1 -3, characterized in that the application of the damping layer and the further layer takes place in a multi-stage operation.

5. The method according to claim 4, characterized in that the application of the damping layer and the further layer takes place with only one device.

6. The method according to any one of the preceding claims, characterized in that in addition to the elastic granules in the damping layer at least one further rock fraction is provided.

7. The method according to any one of the preceding claims, characterized in that as elastic granules rubber or rubber o.ä. is used.

8. The method according to any one of the preceding claims, characterized in that the granules have a diameter between 2 and 20 mm.

9. The method according to any one of the preceding claims, characterized in that the damping layer has a thickness between 2 and 30 mm.

10. A device for carrying out the method according to claim 1, characterized in that the device (20) is a modified paver for the installation of two layers (29, 30), which seen from the rear of the building direction (25) moving device with a screed (24), an installation device (23), and a mounting device (22) is equipped.

1 1. A device according to claim 10, characterized in that a further before the mounting device (22) arranged installation device (21) is provided, with the bitumen or other binder (27), in particular a bituminous binder, can be sprayed.