FR2616458A1 - ALVEOLED CONCRETE SLAB, IN PARTICULAR FOR COVERING PLANT SITES ON PUBLIC SITES - Google Patents

Abstract

The subject of the invention is a hollow-core concrete slab provided with cavities which extend downwardly over the thickness of the slab, from holes made in its upper face. Slab characterized in that the orifices 2 have a relatively small cross section in the upper face of this slab 1, and extend into cavities 4, 4 'which widen downwards and which open into a drainage system constituted by respective channels 7, 8 molded in the underside of the slab 1, the surround 3 of the orifices being, for example, roughened by sand projection or else profiled by molding.

Description

i 2616458 Dyed concrete slab, in particular for covering surfaces

planted on public places

  The present invention relates to a slab al-

  concrete vane with cavities extending down the slab thickness from orifices

  in its upper face, for a floor covering is

  both to circulation and to ambulation, so as to sustain processes biologically necessary for the roots

  trees on sites subject to ex-

  treme. In the heart of the cities, the planted sites of trees are subjected to increasingly strong constraints, so that the trees are visibly exposed to harsher conditions and die little by little. The main problem turned out to be soil compaction and, as a result, throttling

  the arrival of air and water, necessary for life.

  In addition, tree roots located on the ground are mechanically deteriorated and therefore tend to rot. Streets, parking lots, pedestrian zones, school yards and courtyards, as well as public service areas, are all unfavorable places for healthy tree growth. The present invention aims to provide a

  cellular slab of the aforementioned type, making it possible to

  a floor covering that can, on the one hand, be

  by means of transport such as cars,

  trucks, buses and, on the other hand,

  sand supply of air and water in the root zone of

arbres.-

  To achieve the desired object, it is proposed a dimpled slab of the above kind, characterized by the fact

  the above-mentioned openings have a section relating to

  small in the upper face of this slab, and

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  extend into cavities that flare down and that

  result in a drainage system consisting of

  respective goles molded into the underside of the slab,

  the surrounding of said orifices being, for example, rendered

  pigs by projection of sand or profiled by molding. The honeycombed slab according to the invention offers the essential advantage that, thanks to the almost flat upper face, free of large visible remains such as slots or similar configurations, one can dispense with a filling with using a material

  porous fillings, such as gravel, concas,

  chefer or volcanic stones. The volume of cavities

  comes on the other hand available where it is useful to the tree,

  that is to say on the surface of the roots.

  Thanks to the relatively narrow penetration holes in the upper face, and thanks to their large number, the supply of air and water is guaranteed without any surface obstruction or formation occurring.

  mud, known and disadvantageous. As a result of the roughness

  particular area conferred on the entourage of penetration

  tration, fine particles of mud are still

  additionally. The presence of narrow penetration

  Furthermore, it provides for the filling of spaces

  spacers by a porous substrate. The noticeable increase

  the volume of the tubes to the support surface,

  as well as the presence of air channels which form the

  drainage system and are additionally connected to each other, provide a reduction of the contact area, which ensures aeration, operating on any

  the area of the root zone covered and protected.

  The walls of cavities flaring downwards, as well as the

  ditches of the drainage system, also allow for

  partition, all over the lower face of the slab,

  rainwater or irrigation water flowing.

  According to other advantageous features of the invention: - preferably, the orifices made in the upper face of the slab are square with

3 2616458

  a side length of about 15 mm, flake frustoconical-

  up to about 30 mm above the lower bearing surface, and then fuse into a rectangular cavity of square section, preferably traversed by square-section channels that intersect perpendicularly; - Conveniently, the adjacent cavities may extend trunconically to the underside of the slab traversed, according to a perpendicular crisscrossing,

  by the channels advantageously realized as

  section-rectangular or trapezoidal junction;

  - said channels, of section respectively truncated

  conical or trapezoidal, are suitably equipped with a

  additional hooking in the direction of the height, for a better distribution of water and air; and - the slab is preferably provided with an armor or a reinforcement, being manufactured with a concrete of corresponding quality.

  The invention will now be described in greater detail.

  tail as non-limiting examples, with reference to the appended drawing in which:

  FIG. 1 is a plan view of a cellular slab

  according to the invention; and FIG. 2 is a section along line AB of FIG. 1, illustrating various embodiments of FIG.

the hollow slab.

  As revealed in the figures of the drawing, a cellular slab 1 of concrete is materialized by a square plate whose upper face is pierced, in any desired grid, of square orifices 2 with a side length of about 15 mm. mm. An entourage 3 of these orifices, also for example of square shape, is made rough by sand blasting. To this end, a steel die can be placed on the slab, after which the die and the slab scroll together through a sand blasting machine. In this case, the slab is bombarded by sand only inside the recessed areas. This induced roughness makes it possible to ensure that fine particles of mud are retained, but that the water can flow through

4 2616458

the holes 2.

  The orifices 2 join respective cavities 4

or 4 'flaring down.

  The first variant is visible in the right-hand part of FIG. 2, the frustoconical flare of the air chambers or cavities 4 'stopping at about 30 mm above a bearing surface or lower face 5 of the slab. The air chambers then extend perpendicularly with a section

square, as shown in 6.

  Another variant is visible in the left-hand part of FIG. 2. From the penetration orifices

  squares 2, the tubes or cavities 4 extend truncated

  nically to the underside 5 of the slab.

  In both cases, cavities flaring out

  downwards lead respectively to

  the or channels 7 or 8, whose section is either rectangular,

  either frustoconical (that is to say trapezoidal). On the face

  bottom of the hollow slab, the channels extend

  pendicularly to each other and form, from the

  te, a drainage system for water and for air.

  As indicated by the reference numeral 9, the junction channels of respectively frustoconical or

  trapezoidal, may be additionally provided with a

  crocheting in the sense of height, with a view to a better

distribution of water and air.

  The very specific grid of small ori-

  these 2, associated with the underlying drainage system constituted by the channels 7 and 8, gives rise to a slab that can

  to be laid to form a larger system.

  The squared distributions of the upper face and the internal cavities are chosen so as to give the visible face of the slab an aesthetic appearance irreproachable, to adapt to each direction of fitting, and to satisfy

  the requirements imposed on them. The material and the

  their superficial structure can be integrated into the

environment, as needed.

  It is also possible to make the cellular slab according to the invention also practicable by

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  heavy vehicles, thanks to armor or a reinforcement of a

  pe and a corresponding quality concrete, both on

  its entire bearing surface only on its

  nal. The honeycombed slab according to the invention also confers the essential advantage that, after the laying, it

  There is no risk of accidents or tumbles for

clists and pedestrians. -

  It goes without saying that many modifications can

  can be made to the honeycomb slab described and

  without departing from the scope of the invention.

6 2 6 1 6616458

Claims (5)

-R E V E N D I C A T I ON   1. Concrete slab with cavities that extend down the slab thickness, starting from   holes in its upper face, for a coating   soil that is suitable for circulation or for   in order to maintain biologically necessary processes at the roots of trees implanted on sites subject to extreme conditions, slab characterized by the fact that the above-mentioned orifices (2) have a relatively   small in the upper face of this slab (1), and extends   tooth in cavities (4; 4 ') which flare downwards and which open into a drainage system constituted by respective channels (7; 8) molded in the lower face of the slab (1), the entourage (3) said orifices being, for example, made rough by sand blasting or molded profile.   2. Cellular slab according to claim 1, characterized   characterized by the fact that the orifices (2) made in the upper face of this slab are of square construction   with a side length of about 15 mm, are flared   conically to about 30 mm above the underside   of support, then merge into a recess   tangular of square section, traversed by channels (7)   of square section which intersect perpendicularly.   3. Cellular slab according to claim 1, characterized   characterized by the fact that the orifices (2) made in the upper face of this slab are of square construction   with a side length of about 15 mm, the cavities   nantes extending truncated to the underside   (5) of the slab traversed, according to an intersecting   by the troughs (7) made as channels   junction of rectangular or trapezoidal section.   The dimpled slab of claim 1, wherein   characterized by the fact that the orifices (2) made in the upper face of this slab are of square construction   with a side length of about 15 mm, the cavities 7 2616458   nantes extending tronconically to the underside (5) of the slab; and in that the troughs (7) serving as junction channels, of respectively frustoconical or trapezoidal cross-section, are provided with an additional recess (9) in the direction of the height, with a view to a better recess partition of water and air.   5. Wall tile according to one or more of the   previous sales, characterized by the fact that this   slab is provided with armor or reinforcement, and is   with a corresponding quality concrete.