Road structure – process – or apparatus – Pavement – Including bed
Patent
1996-08-09
1998-03-24
Lisehora, James
Road structure, process, or apparatus
Pavement
Including bed
404 28, 404 71, 181210, 181286, E01C 300
Patent
active
057305480
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for producing a pavement (for roads) and to a method for its realization, of the type comprising an upper layer formed by a wearing course of asphalt having an average granulometry, and a lower layer made of cement, concrete or similar materials, supporting the wearing course.
BACKGROUND ART
Pavements of the type described above are already known, and they have drainage and deadening properties because of the particular granulometry of the asphalt employed.
In particular, said known pavements have high acoustic insulation coefficients in the region of high frequencies (higher than 1000 Hz).
Other conventional means for damping the noise, as for example acoustic barriers, vegetation, and special standing finish for buildings, have similar acoustic insulation properties.
On the contrary, vehicular traffic produces an acoustic source which contains in particular average and low frequencies.
Therefore, the results obtained in the reduction of noise due to vehicular traffic on roads have not been so far completely satisfactory.
DISCLOSURE OF INVENTION
In order to find a remedy for this situation, the object of the present invention is that of realizing a pavement of the type described above, characterized in that in said lower layer there is obtained a plurality of cavities facing directly the upper layer, which act as Helmholtz resonators.
From experimental tests there results that pavements according to the invention provide high acoustic insulation coefficients in the region of average-low frequencies and may therefore contribute efficaciously to the damping of noise produced by vehicular traffic.
Preferably, said cavities are filled with granulated material having an average granulometry of 3-5 cm, so as to further enlarge the spectrum of acoustic frequencies which are absorbed significantly.
A further object of the present invention is to provide a method for realizing a deadening pavement, comprising the steps of: associated internal cavity, communicating with the outside through a plurality of slots obtained on a wall of the box-type sections, box-type sections, so as to let said slots uncovered, and asphalt layer of average granulometry.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and properties of the present invention will be evident from the following detailed description, which makes reference to the annexed drawings given only for illustrative and non-limitative purposes, wherein:
FIG. 1 is a perspective sectional view of a pavement length, according to the invention, and
FIGS. 2 and 3 show the experimental percentage values of acoustic absorption against the frequency value, for pavement samples, according to the present invention, and conventional, respectively.
BEST MODE OF CARRYING OUT THE INVENTION
A pavement (for roads) (FIG. 1), comprises an upper layer 10 formed by a wearing course of asphalt with average granulometry, and a lower layer 12 supporting the wearing course, and which is made of cement, concrete or similar materials.
In the lower layer 12, there are buried a plurality of reinforcement iron bars 14 and a plurality of reinforcement box-type sections 16, which have respective internal cavities 18. These latter face directly the overlaying layer 10, in consequence of the presence of slots 20 obtained on the upper wall of the box-type sections 16. The cavities 18 are filled with granulated material 22, for example crushed stone.
A method for realizing a pavement of the above type includes a first step in which the reinforcement iron bars 14 are placed in their position, whereafter the box-type sections 16 are horizontally disposed thereon, whereby the wall on which the slots 20 are obtained, are disposed upwardly. Once the slots 20 have been closed with covering elements inserted thereon, which are not shown in FIG. 1, a layer of cement concrete, or similar material is cast around the iron bars 14 and around the box-type sections 16, taking care of letting the slots 20 uncovered.
Thereafter, the cement la
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Brero Giovanni Battista
Dealessandri Germano
Ostino Antonio
"Autostrade"-Concessioni e Costruzioni Autostrade S.p.A.
IPSE s.r.l.
Lisehora James
LandOfFree
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