Road structure – process – or apparatus – Pavement – Modules or blocks
Patent
1992-05-19
1994-01-25
Bui, Thuy M.
Road structure, process, or apparatus
Pavement
Modules or blocks
404 34, E01C 500
Patent
active
052810488
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a plate-shaped concrete block for covering roads, paths and squares.
Concrete blocks or paving slabs, as an earth covering for roads, paths and squares, are superior in a number of respects to black top pavings and other associated coverings. However, the generation of noise in rolling traffic (by vehicles) is seen as a disadvantage.
SUMMARY OF THE INVENTION
The object the invention is to propose a paving slab or concrete block which, whilst maintaining the advantages of paving slabs as an earth covering, significantly reduce the generation of noise caused by rolling traffic.
In order to achieve this object, the plate-shaped concrete block according to the invention is characterised by the following features:
a) a sound-absorbing absorption layer 13 of porous concrete is disposed on a block element 12 made from (heavy) concrete,
b) the top side of the absorption layer 13 is level, the bottom side and accordingly the top side of the block element 12 is of curved configuration, the absorption layer 13 exhibiting greater thickness at the fringes of the block,
c) the block element 12 is equipped on its bottom side with a curvature 18, such that the concrete block is configured to exhibit a greater height at the fringes of the block.
The invention is based on the recognition that a significant reduction in noise generation in rolling traffic can be achieved by the interaction of a plurality of features in the design of paving slabs or concrete blocks and of the earth covering produced therefrom.
A considerable contribution to the sound absorption is achieved by the upper cross-sectional area of the concrete block, namely by the absorption layer of porous concrete. Paving slabs having a porous concrete coating are known in principle. In the case of this prior art, however, the function of the covering layer of porous concrete is to drain away surface water. The sound-absorbing effect of the porous concrete has not hitherto been recognised.
According to the findings forming the basis of the invention, the concrete blocks are configured in a larger format, namely plate-shaped. Dimensions exhibiting an edge length of at least 30 cm, in particular square concrete blocks having an edge length of 33 cm, have proved to be advantageous for noise reduction. In the case of these larger concrete blocks for earth covering, in order to drain off the surface water adequately, the absorption layer of porous concrete is configured on the bottom side, according to the invention, in a curved shape, so that the surface water can run off to the sides of the concrete block.
Due to the larger dimensioning of the plate-shaped concrete blocks, a special configuration of the bottom side of the same is also necessary, namely exhibiting a curvature. This results in a better load distribution over the suboil. As a result of the configuration according to the invention, the fringe areas of the concrete block are subjected to a higher load on the bottom side. This results even over a prolonged period in a stable position for the blocks.
For the further reduction of noise, it is intended that the concrete blocks according to the invention should be laid at very small distances from one another, i.e. exhibiting very narrow joints. This makes it harder for the surface water to be drained off. According to the invention, the concrete blocks are therefore equipped with upright water drainage ducts, namely slots, on the lateral surfaces. These extend directly below the absorption layer, so that the surface water from this makes its way into the upright slots and then into the subsoil.
Further features of the invention relate to details of the concrete block's configuration and to a process and device for the manufacture of the same.
BRIEF DESCRIPTION OF THE DRAWINGS
Illustrative embodiments, from which further inventive features are derived, are represented in the drawing, in which:
FIG. 1 shows a vertical section through a paving slab according to the invention,
FIG. 2 shows a side view
REFERENCES:
patent: 364928 (1887-06-01), Hoyt
patent: 2662343 (1953-12-01), Rice
patent: 4210698 (1980-07-01), Watson
Bui Thuy M.
SF-Vollverbundstein-Kooperation GmbH
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