DE202009008254U1 - Absorption device for a roadway - Google Patents

Abstract

A pavement absorber (20) wherein the pavement absorber (20) has at least one absorbent member (22) on its underside (24), the absorbent member (22) having a cavity (28) open to the underside (24) is formed and formed open to an outer side (26) of the road surface absorption device (20).

Description

The The invention relates to an absorption device for a Roadway and a road surface with at least one such absorption device.

It It is well known that large parts of the population Feeling bothered by noise, the Noise pollution due to road traffic noise represents one of the main causes. The road traffic noise is currently in the speed range between 50 km / h and 120 km / h mainly of different ones Mechanisms in contact of the rolling tire on the roadway generated.

Around to reduce these sounds will be different types of Noise-reducing road surfaces with different Success used. As noise-reducing road surfaces Basically, we refer to coverings that are compared to a reference surface when driving over with motor vehicle tires lead to lower noise emissions.

In order to qualitatively and quantitatively record the acoustic quality of a road surface, various standardized methods are available, such as the DIN ISO 11819-1 : Acoustics - Measurement of the influence of road surfaces on traffic noise - Part 1: Statistical driving by method.

• – Texturoptimierte Fahrbahnbeläge, die den darüber rollenden Reifen im Vergleich zur Referenz zu quantitativ geringeren Schwingungen anregen,
• – Fahrbahnen mit niedrigen Hohlraumgehalten, die zwischen Reifen und Fahrbahn eingeschlossene und komprimierte Luft ableiten, damit den Geräuschentstehungsmechanismus air-pumping reduzieren und auf Grund einer gewissen schallabsorbierenden Wirkung die Abstrahlung der Rollgeräusche aus der Reifen-Fahrbahn-Kontaktzone vermindern können, sowie schließlich
• – offenporige Asphalte die ebenfalls eingeschlossene Luft ableiten können und die in der Reifen-Fahrbahn-Kontaktzone entstehenden Geräuschemissionen durch schallabsorbierende Wirkung bereits nahe am Geräuschentstehungsort und in der Schallausbreitung hin zu einem Empfänger dämpfen können.

Basically, there are three variants of noise-reducing rigid road surfaces:

• - Texture-optimized road surfaces that stimulate the rolling tires to quantitatively lower vibrations compared to the reference,
• - Lanes with low void levels, which derive the trapped and compressed air between the tire and the road, so that the noise generation mechanism air-pumping reduce and due to a certain sound-absorbing effect can reduce the radiation of rolling noise from the tire-road contact zone, and finally
• - open-pore asphalt as well as the trapped air can derive and dampen the resulting noise in the tire-road contact zone by sound-absorbing effect already close to the noise source and in the sound propagation to a recipient.

Next These three basic variants will continue to be combinations thereof realized.

Of the hitherto most effective noise-reducing and in practice usable road surface corresponds to a further development of above-mentioned third basic variant and is described as a two-layer, open-pored asphalt called. This two-layer, open-pore Asphalt (ZWOPA) consists of two superimposed open-pored layers of a specially conditioned mineral mixture which with bituminous polymer or rubber-modified Binders is bound. In the specially conditioned mineral mixture is a pronounced default grain for production the cavity structure used as well as special grain shapes to increase the strength. Due to the two-layer layer structure it is possible a relatively good sonic sorbent Effect with a sufficiently fine rough texture of the surface (by using smaller grain sizes in the upper layer) and through the large-pored lower Layer to counteract pollution phenomena. The necessary requirements for traffic safety and durability are fulfilled. By installing a two-layer, open-pored asphalt (ZWOPA) are level reductions of up to 10 dB (A) compared to conventional split mastic asphalts 0/11 and 0 / 11S for passenger cars and up to 7 dB (A) for Heavy commercial vehicles can be reached.

at all currently practicable absorbent Road surfaces (including the two-layer, open-pored Asphalt (ZWOPA)) results from the choice of materials and composition However, a frequency-selective absorption spectrum, that is the Fahrbahnblag acts in the frequency range of the tire-road contact emitted noise is not always well absorbent, but rather has areas in which the absorption is very achieved good values, but also areas in which there is almost no absorption, For example, an absorption of only 10% occurs.

Around despite this frequency-selective absorption good level reductions Achieve appropriate absorbent road surfaces consuming to the respective traffic situation, for example the Traffic composition and traffic speed.

Moreover, there were in the research approaches, the absorbing effect of the porous asphalt mix through the use of sound-absorbing substructures of high absorbing passive absorber structures (eg. B. Style Transportation ^® and Weg met Geluid) to improve the dau manent effect of this substructure regarding pollution and water input is strongly questioned and there are no validating measurements of acoustic quality in practice.

Therefore It is the object of the present invention, an improved Absorption device for damping the sound emissions to provide a roadway, in particular a roadway for the motor vehicle traffic, such. B. a street or a Highway.

These The object is achieved by an absorption device with the features of claim 1.

Accordingly, becomes According to the invention, a road surface absorption device provided, wherein the road surface absorption device on at least one absorption element or a Helmholtz resonator on its underside wherein the absorption element or the Helmholtz resonator has a cavity which is open to the bottom is and to an outside of the road surface absorption device is open.

The called geometry of the absorber or Helmholtz resonator has the advantage that it is the noise caused by the Contact between tire and road surface is absorbed efficiently can, without being in the installed state of the cavity of the absorption element or the cavity of Helmholtz resonator unintentionally run full of water can, what else to a deterioration of the absorption function and for the early destruction of the element Freezing water would result.

advantageous Refinements and developments of the invention will become apparent the dependent claims and the description with reference on the drawings.

The Invention will be described below with reference to the schematic figures the drawings specified embodiments closer explained. Show it:

1 a representation of a sound-absorbing element according to the prior art, on which an asphalt layer is partially applied;

2 a representation of a further sound-absorbing element according to the prior art, on which also an asphalt layer is applied;

3 a perspective view of an absorption device according to the invention with a plurality of absorption elements according to the invention;

4 a sectional view through an absorbent element according to the invention, which is installed in a roadway;

5 a schematic sectional view through a road surface with several built-absorption devices;

6 a sectional view of a Helmholtz resonator;

7 a diagram of a frequency response of the sound absorption coefficient of an open-pored asphalt, three differently tuned Helmholtz resonators and the resulting Schallabsorpsionsgrades when superimposed Helmholtz resonators;

8th an example of a laying pattern of absorption devices according to the invention;

9a -C views of the installation of absorption devices according to the invention in a roadway;

10 a view of an absorbent device according to the invention from below;

11 a side view A of the absorption device according to 10 ;

12 a view of the absorption device according to 10 from above; and

13 a side view B of the absorption device according to 10 and 12 ,

In all figures are the same or functionally identical elements and devices - if nothing else is indicated - with the same reference numerals been provided.

In 1 is a photograph of a so-called IPG resonator 10 according to the prior art, on which an asphalt layer 12 partially applied.

Within the Dutch project "Dutch Noise Innovation Program Road Traffic (IPG) and Roads to the Future Program (WnT)", there were attempts to incorporate acoustic Helmholtz resonance absorbers in the road surface, as in 1 are shown so as to improve the areas of minimum absorption. The IPG resonators developed in this program 10 corresponded to the line construction, whereby the negative influence of penetrating water should be minimized by laterally discharging the water through the resonator. However, this led to a loss of the acoustic effect, since the line arrangement has no importance for the resonance behavior closed hollow body and the dimensioning of the lines resonators 10 and the sound source (tire-road contact) were not matched, creating an excitation of the resonator 10 not possible.

As in 1 Shown are the IPG resonators 10 a transversely extending through cavity 14 or channel on, on its two outer sides 16 , as well as on its top 18 is open. Furthermore, the open cavity tapers 14 or channel to the top 18 out. On the top 18 then becomes an air-permeable or porous road surface layer 12 applied. However, as described above, this has the disadvantage that no closed cavities necessary for the use of the arrangement as Helmholtz resonator arise, which is why the resonance effect does not arise or is not pronounced and the channel-shaped cavities 14 can easily fill with water, here rainwater, and thereby lose any sound absorbing effect. Although the water can escape laterally from the cavities 14 or drain channels to the outside. However, the lateral openings of the channels can easily clog, so that the rainwater in the channels then can not be discharged to the outside and thus the sound-absorbing effect of the channels is lost.

Furthermore, in 2 a photo of a so-called SIRUUS resonator 10 according to the prior art, on which a first layer of an asphalt layer 12 is applied.

In the BRITE-EURAM project SIRUUS (Silent Road of urban and extra urban use) of the European Union, Helmholtz resonators opened at the top were installed in the carriageway, as in 2 is shown. However, these were not protected against rainwater entry and thus lost their effectiveness because they regularly filled with water, as well as the IPG resonator in 1 ,

The SIRUUS resonator 10 in 2 has substantially the same structure as the IPG resonator in FIG 1 , This is the SIRUUS resonator 10 also in the transverse direction cavities 14 on, on both sides 16 are open and also to their top 18 are formed open towards. The elongated or channel-shaped cavities are tapered 14 to their top 18 out. On the top 18 then becomes an air-permeable or porous road surface 12 applied, through which rainwater can penetrate. Due to the opening of the cavities 14 Water can easily move up into the cavities 14 penetrate and the sound-absorbing effect of the SIRUUS resonator 10 be prevented if the water z. B. due to a blockage of the lateral openings no longer from the cavities 14 can be derived to the outside.

As previously described with reference to the prior art are Products such as the two-layer, open-pored asphalt (ZWOPA) available, the lower compared to conventional road surfaces Generate noise emissions. The absorbent properties However, these road surfaces are only bad adapted to the tire-road noise to be damped.

The The invention therefore provides an absorption device which at least one, two, three and more or a plurality of absorption elements having. By the absorption device and its respective absorption element can now such noise-reducing road surfaces be improved.

Such an absorption device according to the invention 20 with absorption elements 22 is in 3 shown in a perspective view seen from below. More specifically, in 3 an absorption device 20 with, for example, six absorption elements 22 represented, each of which form a Helmholtz resonator.

Due to the large areas that can be realized in road construction, the cost of materials is an important economic factor. Accordingly, it makes sense from an economic point of view to produce the main components of the road surface from relatively inexpensive starting materials. From an acoustic point of view, however, with the commonly used material compositions certain limits on the way to optimized sound-absorbing properties can not be exceeded, since for optimum absorption various acoustic parameters, such as void content, flow resistance, layer thickness, and the structural factor within a structural View narrow tolerance range must be kept. For each of these parameters, limits are set either from a structural point of view, due to valid physical relationships or for economic reasons, which are further reinforced by the dependence of individual parameters on each other. So it is not possible, for example, the void content of the two-layer, open-pored asphalt (ZWOPA) to values z. B. over 30%, because then the necessary strength for practical use is no longer given. On the other hand, the flow resistance in the two-layer, open-pored asphalt (ZWOPA) is too low from an acoustic point of view, but can not be adjusted independently of the void content. The layer thickness is with increasing values both from constructional considerations with regard to the durability difficult to realize, as well as economically unprofitable.

Around the obvious further reduction potential of noise reducing Road surfaces such as the two-layer, open-pored asphalt (ZWOPA) and other road surfaces continue to expand, are now the invention Absorption devices with at least one absorption element or reactive absorber under z. B. built in open-pore coatings. By the use of absorption elements according to the invention or reactive absorbers, the areas of low absorption of open-pored coatings, d. H. for example, both open-pored Asphalt, as well as open-pore concrete and other open-pored coatings in a single-layered and multi-layered construction and thus the noise emissions at their formation and on the way to becoming a recipient stronger be steamed.

As in 3 is shown forms each of the absorption elements 22 while on the bottom 24 the absorption device according to the invention 20 , with which this is later placed on a road surface, one to the bottom 24 and to an outside 26 open cavity 28 ,

The cavity 28 consists of at least two cavity sections 30 . 32 together, an inner first cavity section 30 and an outer, second cavity portion 32 , The inner first cavity section 30 is larger than the outer second cavity portion 32 , Two or more or all absorption elements 22 an absorption device 20 can each have a cavity 28 with an equal first, inner cavity portion 30 and / or an equal outer, second cavity portion 32 exhibit. Alternatively, two or more or all absorption elements can also be used 22 a different sized first cavity portion 30 and / or a different sized second cavity portion 32 exhibit. This applies to all embodiments of the invention.

In the in 3 example shown, each example, six different sized absorption elements 22 provided so that the absorption elements 22 address or absorb different resonance frequencies. More specifically, three are small absorption elements 22 provided, each having the smallest first and second cavity portion 30 . 32 of the entire absorption elements 22 exhibit. Furthermore, an absorption element 22 provided, of all the largest first and second cavity section 30 . 32 having. Next are two absorption elements 22 provided, the first and second cavity portion 30 . 32 is greater than that of the three smallest absorption elements 22 but smaller than the first and second cavity portions 30 . 32 the largest absorption element 22 ,

In other words, in the in 3 shown absorption device 20 , a total of six absorption elements 22 Helmholtz resonators integrated, where the cavities 28 the absorption elements 22 have different sizes. Due to the different size of the cavities 28 the absorption elements 22 Absorb or speak the absorption elements 22 different resonance frequencies. The functionality of the absorption elements 22 or the Helmholtz resonators is by an airtight or substantially airtight bonding of the absorption elements 22 reached with the underground. The absorption elements 22 For example, in a given laying pattern, as exemplified in the following 8th is shown with defined distances from each other on the pad z. B. glued by a bituminous binder. The respective absorption element 22 is with his bottom 24 mounted on an air-impermeable layer to the cavities 28 to close airtight from the bottom. The outside 26 the respective absorption element 22 or its cavity 28 on the other hand is closed with an air-permeable or porous layer, as in the following 4 and 5 is shown. Optionally, in addition, the absorption device 20 on their bottom 24 additionally structured, for example, at least one or more wells 34 or undercuts, for better attachment to the ground. It can be z. B. in addition a bituminous binder can be used as an adhesive for sticking the absorption device 20 on the ground or a first layer.

In 4 is further a sectional view through a part of an absorption device 20 according to the invention, wherein the absorption device 20 in a roadway 36 is installed. The absorption device 20 has, for example, two absorption elements 22 on, wherein at the first absorption element 22 its inner, first cavity section 30 and its outer, second cavity portion 32 is shown. In the second absorption element 22 is only the inner, first cavity section 32 shown. The second cavity section 30 is not shown here. As in 4 shown are the cavities 28 the two absorption elements 22 to the bottom 24 and to an outside 26 the absorption device 20 formed open.

The absorption device 20 with its two absorption elements 22 is with her bottom 24 or with their cavities 28 on a first layer 38 applied, which is a substrate or a support for the absorption device 20 forms. This first layer 38 or the background forms z. B. an air-impermeable layer, so that the cavities 28 the absorption elements 22 the absorption device 20 be sealed air-impermeable by this layer. The absorption device 20 can, for example, additionally by a bituminous binder 40 on the ground or the first layer 38 be glued on. However, the invention is a bituminous binder 40 not limited. It is also possible to use any other binder which is suitable for bonding an absorption device to a corresponding substrate. On the top 42 and the outside 26 the absorption device 20 becomes at least a second layer 44 applied, this second layer 44 is permeable to air.

In 5 is further a schematic sectional view through a road surface 36 with four absorption devices according to the invention 20 shown. The absorption devices 20 can thereby at least one, two or more absorption elements 22 or resonator elements (not shown). Examples of absorption devices 20 with absorption elements 22 are in the 3 . 4 and 9 - 13 shown. The absorption devices 20 be with their bottom 24 first on a first shift 38 or a substrate applied which z. B. is impermeable to air. In the case that the ground is permeable to air or porous, the respective absorption device 20 preferably at least airtight attached to it. In both cases, the bottom is 24 the cavities of the absorption elements 22 thus preferably airtight. The absorption devices 20 can thereby by an example bituminous binder (not shown) on the first layer 38 optionally additionally glued on. After the absorption devices 20 on the first layer 38 These have been laid, for example, with two layers 44 . 46 open-pored asphalt, z. As the open-pored asphalt (OPA) 0/8 and the open-pored asphalt (OPA) 0/11 overbuilt, as in 5 is shown schematically. These two layers 44 . 46 from z. B. various open-pored asphaltene (OPA) are permeable to air and are on the top 42 and circumferential on the outsides 26 the absorption devices 20 intended. In this case, each one outside 26 the cavities 28 , unlike the bottom 24 the cavities 28 , with the air-permeable layer 44 locked. Instead of two layers 44 . 46 can the absorption devices 20 also be embedded in only one or more than two layers. It is crucial that the respective layer 44 . 46 is permeable to air, so that the respective absorption element 22 act as a Helmholtz resonator or can act.

In 6 is the general principle of a Helmholtz resonator 48 shown schematically and greatly simplified. For Helmholtz resonators 48 In principle, these are spring-mass systems, in which one air volume acts as a mass and one air volume acts as a spring. In other words, in such a spring-mass system can be a localized, acting as a mass, unilaterally associated with the ambient air volume of air, which is spatially in front of an all-sided by rigid walls acting as a spring air volume, to vibrations by sound waves stimulate. More specifically, the mass of air acting as a mass to excite vibrations when the resonance frequency of the spring-mass system is equal to the frequency of the sound wave.

Becomes In addition, the inner air volume, so the spring volume the resonator, partially or completely with a porous or air-permeable material, so the flow resistance in the interior of the resonator also be increased. Thereby the sound-absorbing effect widens in its bandwidth. In this case, the first cavity portion and / or the second cavity portion the cavity of the absorption element at least partially or completely with a porous material or air-permeable Be filled with, for example, a glass fiber wool, to give an example of such a filler. However, it can also use any other filler become porous or permeable to air and itself for use with an absorption element for a Road surface is suitable.

In 7 Furthermore, a diagram of a frequency response of the sound absorption coefficient of an open-pored asphalt is shown, as well as three differently tuned absorption elements or Helmholtz resonators. In addition, in the diagram of the resulting sound absorption coefficient at a superposition of the absorption elements or the Helmholtz resonators is shown.

Resonance absorbers basically act only in a narrow frequency range, which is typically smaller than the range of low absorption in sound-absorbing road surfaces. Nevertheless, in order to improve the absorbing properties within the entire range of low absorption, according to the invention, a plurality of mutually detuned absorption elements or resonance absorbers are used. For this purpose, the resonance frequencies of, for example, 2 to 10 or more different types of absorption elements or Helmholtz resonators are set so that they z. B. at equidistant frequency intervals on the frequency axis within the range mini painter absorption of, for example, open-pored asphalt (OPA).

The Setting the resonant frequencies is done by geometric Dimensioning of the absorption elements of the absorption devices. in principle are in the combination of absorption elements or Helmholtz resonators with, for example, an open-pored asphalt (OPA) two versions conceivable, the base variant and the installation variant. In the substructure variant becomes a loadable below the open-pored asphalt (OPA) layer Location with integrated absorption elements or Helmholtz resonators built-in. The execution of the absorption elements or The Helmholtz resonators is designed such that their mouth opening direction is rotated by at least 90 ° from the vertical or the mouth openings, for example, horizontal or be arranged almost horizontally. This ensures that the absorption elements or resonators of the absorption devices can not fill with rainwater and so on one after bad weather periods remain functional and on the other hand in thawing periods no frost damage occur.

The Absorption elements or resonators of the absorption devices can optionally additionally damped in the inner volume so as to increase the effective bandwidth. Ie. the inner or first cavity portion of the cavity of the respective absorption element may be at least partially or completely with an air-permeable or porous filling material be filled, such as glass wool or a other suitable material. Optionally additional or Alternatively, the outer, second cavity portion of the Holraums of the absorption element at least partially or completely with an air-permeable or porous filling material, such as As fiberglass wool, are filled, depending on the function and purpose. The individual absorption elements or Helmholtz resonators different resonant frequencies can be in an absorber with at least two or a plurality of absorption elements be summarized. So it is possible on the one hand, the Total number of individual elements to reduce and the installation process to accelerate. On the other hand, the number of absorption elements or resonators per resonance frequency in a predetermined ratio to be brought.

The built-in absorption elements or reactive absorber can be designed to withstand pollution, mechanical and chemical loads, the temperature fluctuations occurring and in the construction of registered water are resistant and in their long-term effect not impaired become. These are both the materials used, as well to make special demands on the structural features. The absorption device with one, two or more absorption elements can be made of polymer concrete and / or mastic asphalt, for example getting produced. These materials have the advantage of being are very temperature resistant. The materials can both heat, for example when applying the hot Road surface and on the other hand also cold or frost good withstand. In principle, the invention is not on these examples of materials for the preparation of the invention Absorption devices limited.

In 8th an example of a possible laying pattern for the absorption devices according to the invention is shown. The absorption devices 20 For example, each have six absorption elements, as exemplified in 3 is shown. The absorption devices 20 are z. B. offset from one another in the direction of travel and / or transversely to the direction of travel. Furthermore, the absorption devices 20 a predetermined distance a or b to each other transversely to the direction of travel and a predetermined distance c along the direction of travel. The distances a, b and / or c may, for example, be the same size or different sizes. Basically, the absorption devices 20 also z. B. in series or not offset from each other in the direction of travel and / or be arranged transversely to the direction of travel. The arrangement and distances of the absorption devices 20 In principle, they can be varied as required, depending on the function and intended use.

The 9a , b and c each show a section of the installation of absorption devices 20 , The absorption devices 20 correspond, for example, the absorption device 20 in 3 each with six absorption elements 22 , There can be any absorption devices 20 be combined with one or more absorption elements. For example, absorption devices with a different number, positioning and / or dimensioning of absorption elements can also be combined or laid with one another.

In 9a is shown as a variety of absorption devices 20 with her bottom 24 initially on a in the present case z. B. air impermeable first layer 38 be applied. The bottom 24 the respective absorption device 20 with their cavities of the absorption elements 22 is closed airtight. In this case, the absorption devices 20 for example, with a bituminous binder on the first layer 38 additionally glued on. As in 9a is further shown, are the absorption devices 20 z. B. spaced apart and arranged offset from one another. In principle, however, the absorption devices can be arranged as desired with each other. 9a is merely an example of an arrangement.

In 9b is an enlarged section of the one on the first layer 38 arranged absorption devices 20 shown. The outwardly open side of the cavities of the absorption elements 22 the absorption devices 20 shows, for example, the same page. As in 9b is shown, the open side of the cavities to the right and to the left but not up and down. Basically, the absorption devices 20 be arranged with their outwardly open side of the cavities as desired to each other.

In 9c gets on the first layer 38 with the absorption devices arranged thereon 20 at least a second layer 44 applied, which consists of an air-permeable or porous material. This second layer 44 encloses each open on one side cavity of an absorption element 22 the corresponding absorption device 20 from the outside with the second, air-permeable or porous layer 44 , The second layer 44 For example, it fills the gap between the absorption devices 20 on and optionally additionally covers the top 26 the absorption devices 20 from. On the second layer 44 Optionally, additionally at least one further third layer may be provided from an air-permeable or porous material (not shown).

In the 10 . 11 . 12 and 13 In the following, different views of an example of the absorption device according to the invention are shown 20 according to 3 shown.

In 10 is the absorption device 20 doing so from the bottom 24 shown off. The absorption device 20 has six absorption elements 22 on. Each of the absorption elements 22 each has a cavity 28 on which to the bottom 24 is open towards and to an outside 26 the absorption device 20 where the cavity 28 each an inner, first cavity portion 30 and an outer, second cavity portion 32 having. The second cavity section 32 is smaller, for example, narrower than the first cavity section 30 , Furthermore, there are three absorption elements 22 on each case an outside 26 the absorption device 22 arranged. The outsides 26 each of the three absorption elements 22 lie, for example, opposite. In principle, the absorption elements can also be distributed on one, two, three or all four outer sides of the absorption device, depending on the function and intended use. Instead of a quadrangular shape of Absorbtionseinrichtung 20 how they z. In 10 however, the absorber may be any other shape such as a polygonal shape such as triangular, pentagonal, hexagonal, etc., and / or a round shape and / or an oval shape, to name just a few examples. The absorption element or the absorption elements can be arranged arbitrarily on the underside of the respective absorption device. 10 shows only one embodiment of an absorption device and the arrangement of the associated absorption elements.

In the present example, the two outer absorption elements 22 leading to the one outside 26 are formed open, a smaller cavity 28 as the interposed absorbent element 22 ,

For the three absorption elements 22 which to the other outside 26 the absorption device 20 formed open, it is, for example, just the opposite. There are the cavities 28 the two outer absorption elements 22 bigger than the cavity 28 of the absorption element 22 between. Furthermore, in the present example, the cavity is 28 the middle absorption element 22 that is between the two absorption elements 22 with the smaller cavities 28 is arranged, of all absorption elements 22 the biggest.

In 11 is a side view A of the absorption device 20 from 10 shown. In side view A is the outside 26 the absorption device 20 shown, to which the three cavities 28 the three associated absorption elements 22 are open. The cavities 28 are at the bottom 24 the absorption device 20 open and formed to the top 42 closed. Furthermore, at least one outer side 26 the absorption device 20 at least partially or completely bevelled or straight (not shown) may be formed. In the example in 11 are the outside 26 with a continuous slope for better removal of the absorption device in the machining process 20 Mistake.

In 12 is a plan view of the absorption device 20 from 10 shown. The absorption elements 22 with their cavities 28 are indicated by a dashed line.

Furthermore, in 13 a side view B of the absorption device 20 from 10 shown. In the side view B is the other or closed outside 26 the absorption device 20 shown. The cavities are 28 the two outer absorption elements 22 drawn with a dashed line. These two cavities 28 are doing to the respective outside 26 the absorption device 20 open.

Even though the present invention with reference to preferred embodiments is described, it is not limited thereto, but modifiable in a variety of ways. The aforementioned embodiments are combined with each other, in particular individual features thereof.

10

resonator

12

asphalt layer

14

cavity

16

outside

18

top

20

absorber

22

absorbing element

24

bottom

26

outside

28

cavity

30

first cavity portion

32

second cavity portion

34

deepening

36

roadway

38

first layer

40

binder

42

top

44

second layer

46

third layer

48

Helmholtz

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - DIN ISO 11819-1 [0004]

Claims (14)

Road surface absorption device ( 20 ), wherein the road surface absorption device ( 20 ) on its underside ( 24 ) at least one absorption element ( 22 ), wherein the absorption element ( 22 ) a cavity ( 28 ), which leads to the underside ( 24 ) is open and to an outside ( 26 ) of the road surface absorption device ( 20 ) is open. Road surface absorption device according to claim 1, characterized in that the cavity ( 28 ) a first, inner cavity portion ( 30 ) and a second, outer cavity portion ( 32 ), wherein the first, inner cavity portion ( 30 ) is larger than the second, outer cavity portion ( 32 ). The road surface absorption device according to claim 1 or 2, characterized in that the road surface absorption device ( 20 ) at least two absorption elements ( 22 ), wherein the absorption elements ( 22 ) are dimensioned differently or identically to absorb a different or identical resonance frequency. The road surface absorption device according to claim 1, 2 or 3, characterized in that the road surface absorption device ( 20 ) at least two absorption elements ( 22 ), wherein the resonance frequencies of the absorption elements ( 22 ) lie in equidistant or non-equidistant frequency intervals on the frequency axis within a predetermined absorption range of a road surface or a road surface layer. Road surface absorption device according to claim 4, characterized in that the resonance frequencies of the absorption elements ( 22 ) are at equidistant or non-equidistant frequency intervals on the frequency axis within a minimum absorption area of an open porous asphalt (OPA). Road surface absorption device according to at least one of claims 1 to 5, characterized in that at least the underside ( 24 ) of the road surface absorption device ( 20 ) is formed smooth or structured. The road surface absorption device according to at least one of claims 1 to 6, characterized in that the road surface absorption device ( 20 ) consists of polymer concrete and / or mastic asphalt or has this. The road surface absorption device according to at least one of claims 1 to 7, characterized in that the cavity ( 28 ) of the absorption element ( 22 ) is at least partially or completely filled with a sound-absorbing filling material. Road surface with a road surface absorption device ( 20 ) according to at least one of claims 1 to 8. The road surface according to claim 9, characterized in that the road surface is a first layer ( 38 ), on which the underside ( 24 ) of the road surface absorption device ( 20 ) is attached airtight. The road surface according to claim 10, characterized in that the road surface absorption device ( 20 ) at least on the first layer ( 38 ) Is fastened by means of an adhesive. Road surface according to claim 11, characterized in that that the adhesive is a bituminous binder. The road surface according to one of claims 10 to 12, characterized in that the first layer ( 38 ) is an air-impermeable, an air-permeable or a porous layer. Road surface according to one of claims 10 to 13, characterized in that the road surface at least a second and / or third air-permeable ( 44 . 46 ) or porous layer, which at least the outside ( 26 ) of the road surface absorption device ( 20 ) to which the cavity ( 28 ) of the absorption element ( 22 ) is open.