LU82146A1 - INTERVIEWS WITH CELLULAR CONCRETE - Google Patents

Description

t.-ttot v "

y ♦ »7- | C GRAND-DUCHY OF LUXEMBOURG

...... ™ ........ 1 ......... ¾ ^. February 8, 1980 λτΗΙΗλ ,,.

of ................................................. ................... Minister . of the National Economy and the Middle Classes

Book title: ........................................ 3¾¾

Industrial Property Department ô | g | 9 LUXEMBOURG

Patent Application I. Application

The public limited company known as: B.M. COSTAMAGNA SA, Immeuble Le Galion, Résidences du Grand Large, boulevard J.F. Kennedy, 06 80 9 C a g ne s / M e r, F r a n ce, represented by Monsieur (2)

Charles München, acting as agent 15 opposes ........ this ...... eight February 1900 ..... eighty ...... ~ ....... ............................................ (3) to .. .............. * .............. hours, at the Ministry of National Economy and the Middle Classes, in Luxembourg: 1. this request for obtaining a patent for an invention concerning: 4 ................................... .................................................. .................................................. .................................................. .................................................. ........................................... (4) "Entrevous â sous - face in cellular concrete ",. declares, assuming responsibility for this declaration, that the inventor (s) is (are):

MonsieüT ~ 8? Rthë1ëmy, Marius COSTAmagna, 6, boulevard (5)

Carabacel, Ö6ÖÖÖ Nice, France "'Γ. Λ Λ Cagnes / Mer, January 22, 1980 3. language description ------------------------- -----............................................. ...... of the invention in two copies; 4 ................................. plates of drawing, in two copies; 5. the receipt of the fees paid to the Luxembourg Registration Office, on February 8, 1980_______________________ ______________________________ claims for the above patent application the priority of one (s) request (s) from (6) filed "on (7) .............. El" !! "" ____________________________________________________ on February 9, 1979 under No. 79 03308 in the name of (8) B 7hT ..... CÖSTÄMÄGNÄ ..... & ..... Cie ...... (Société ..... en Commandite ..... Simple) having changed its company name in BM CÖSTÄMÄGNÄ SA (Société anonyme). ........... i. * ------------------------------------ ---------------- rlnc ------------- e ...... ri ............ .................................................. ....................... .................................................. ....... GO) requests the issue of a patent for the subject described and represented in the appendices to this issue to ... LL ............. ........................month.

II. Deposit Minutes

The aforementioned patent application has been filed with the Ministry of National Economy and the Middle Classes, Industrial Property Service in Luxembourg, dated: February 8, 1980 ........ Pr. the Minister at hours / \ of the National Economy and the Middle Classes, / \ P- d.

e.oHï \ j Λ A 68007 .........

r \ '' N v. K -rr: -: - r -: - rr -: - -: -: - r—- β 2.4281 Claim for priority of the corresponding application filed in France on February 9, 1979 / i under No. 79 03308 ~ / :: \ i | ; ! 4

ί. MEMORY 'DESCRIPTION

! filed in support of a request for

PATENT

l ·

I in the Grand Duchy of LUXEMBOURG

I;

f on behalf of B.M. COSTAMAGNA SA

i for:

; "INTERVIEWS WITH CONCRETE UNDERFACE

i; | CELLULAR ", Γ! S

AT

i -i ri "t! 0» «.« i 0 *, For the manufacture of floors, it is common to use interjoists placed on the beams and which serve as formwork for pouring the concrete slab forming the floor These interjoists can moreover constitute the ceiling of a lower room or serve as a support for hanging a ceiling either prefabricated or produced by coating the interjoists.

Many materials have been recommended for the realization of these interjoists, in particular cement, ceramic products, and it has also been proposed to interpose between the interjoists and the cement slab volumes of insulating bodies, such as polystyrene.

However, plastic foams such as polystyrene, if they have good insulation qualities, have hardly any resistance to fire; to obtain both good resistance r- ′, to fire and good thermal insulation, we have therefore been led to propose composite interjoists formed of an underface of more or less light concrete (for example concrete loaded with products cell or fiber), which is associated with a polystyrene enhancer or the equivalent.

The difficulty encountered in these techniques is that it is then necessary to carry out these interjoists by gluing, cutting to shape and other costly operations which increase the cost price of the interjoists and limit its possibilities of use.

The object of the present invention is to remedy these drawbacks and is aimed at a process for producing composite interjoists as well as the products resulting therefrom.

The process according to the invention consists in producing the composite material by molding plastic cellular concrete with closed cells in molds whose face corresponding to the face ij of concrete which is to be coated with polystyrene is constituted by j a block of polystyrene shaped to constitute the final enhancement 1 and whose lateral flanks include redents for the conform; 33 concrete mation of rebates intended to rest on the wings of the beams on which the interjoists will be placed.

A composite interjoist is thus obtained in a single operation, the underside of which is made of cellular concrete with closed cells and is provided with rebates for the positioning /, i ^ Q on the beams and the upper face of which carries a rehausaâ /

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φ of polystyrene fixed to the underside by the manufacturing memo operation without gluing or stapling operations and without the need to resize the assembly afterwards.

For the implementation of the invention it is necessary to choose a plastic cellular concrete capable of being molded and to harden by drying after molding. The expression plastic cellular concrete thus refers to cellular concretes obtained by mixing liquid concrete with certain adjuvants and which are cellular on leaving the mixer, in contrast to concretes 10 which become cellular by heating or steaming and which can only be formed by sawing or grinding after hardening. Furthermore, it is important that it is a cellular concrete with closed cells, in particular for reasons of permeability · the water uptakes and the withdrawal phenomena are indeed very different from those of open cell concretes. And if it is possible to consider direct plastering on the underside of closed-cell concrete, this operation can only be done with the addition of laths in the sub-face in the case of open-cell concrete.

An example of concrete of the type to which the invention relates is given in French patents n ° 74.08 ^ 18, n ° 7k, 26693 and n ° 7 * OlW.

Such concrete can be loaded with light aggregates, such as aggregates of expanded products (expanded clay, plastic foams, expanded glass) without departing from the scope of the invention.

The fact that the process of the invention makes it possible to obtain composite interjoists with aerated concrete underside resting on the beams by the rebates of these undersides is very important because in the event of fire, the polystyrene constituting the enhancement can be destroyed without the underside collapsing which keeps the fire protection in a permanent state.

The preferred embodiment of the invention consists in making the interjoists inside out, the polystyrene extension constituting the mold base which remains open at the upper face forming the underside of the interjoist. This embodiment requires special care • for the completion of a complete filling of the mold at the rebates intended to support · * of the interjoist on the beams and it requires that the upper face of the concrete be suitably leveled as a rule, once the product is made, it will form the underside of the interjoist. / Jr

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However, if this embodiment provides more uniform products of constant density, it ensures good adhesion of the concrete to the polystyrene and requires a minimum of oiling of the molds.

; jj ‘5 As a variant, we can realize the interjoists at the place | by pouring aerated concrete on an oiled mold base then in ij j placing the polystyrene, finally by applying pressure! on the latter.

This embodiment provides a very regular underside and poses no problems for the realization of the sheets! support lures. By cons due to the application of pressure on a cellular plastic concrete it becomes more difficult to control the regularity of density and height of the products. On the other hand, the adhesion of the polystyrene to the concrete is less good and: it is necessary to carry out before each casting an oiling j. * complete mold base,; The two embodiments above are illustrated {?] By the accompanying drawings, as well as the product resulting from the process i j of the invention. On these drawings: | i 20 Figure 1 is a schematic sectional view illustrating 5 reverse molding 5

Figure 2 schematically illustrates molding on the right; ! Figure 3 is a perspective sketch of the product resulting from the process.

Referring to FIG. 1, it can be seen that the composite interjoist consists of an underside of aerated concrete 1 and an i | polystyrene enhancement 2. It is molded upside down, the polystyrene i v being placed under the concrete. The polystyrene block 2 constitutes the bottom 30 of the mold, resting on the supports 4. After the lateral forms 3 have been put in place, it can be seen that the concrete 1 is molded in a mold; comprising a face formed by the block of polystyrene 2 and! sidewalls comprising recesses 7 for the conformation of the rebates 8 by which the interjoists will rest on the support beams of the floors.

ij Plastic cellular concrete is in the form jj of a thick cream and it is therefore necessary to ensure that the rebates 8 are filled correctly. The free upper surface of the open molds must also be carefully adjusted. /

In the case of Figure 2, the interjoist is cast W \ f \ uf.

• "" the place in a mold comprising a flat bottom 9 and flanks 5 provided with rodants 7.

After pouring the cellular cellular concrete 1, the polystyrene 2 is put in place to which a pressure P is applied. The mold 5 is thus closed.

The advantages and disadvantages of the two methods have been mentioned above.

FIG. 3 represents the finished product which is characterized in that the underside 1 is on cellular concrete molded with its rebates 8 and in that the polystyrene 2 is directly bonded to the concrete without interposition of glue or use of staples.

In the course of the description, the extension 2 has been described as consisting of polystyrene. Any other insulating plastic foam can replace this polystyrene without departing from the scope of the invention.

To increase the adhesion of the polystyrene block 2 (or other foam) to the concrete 1, it is advantageous to provide reliefs, indentations, or accidents on the surface of the block 2 in contact with the concrete. This results, for the finished product, a concrete-polystyrene interface comprising reliefs, indentations or accidents showing the penetration of the concrete during the molding. q r

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Claims (5)

5 "CLAIMS. 1. composite interjoist of the type comprising a concrete underside surmounted by an extension made of cellular material, such as polystyrene, characterized in that the concrete underside is a thick layer of 5 closed cell plastic cellular concrete obtained by molding with the installation rebates of Ventrevous and that the polystyrene enhancement is bonded to the concrete by direct contact during the setting and drying of the latter. 2. interjoists according to any one of claims 10 1 or 2, characterized in that the cellular concrete with closed cells is loaded with aggregates of expanded products such as plastic foam balls. 3. Method of manufacturing an element according to any one of claims 1 and 2, characterized in that it consists in operating by molding a thick layer of plastic cellular concrete with closed I5celIules in molds of which one face is constituted by a block of plastic foam shaped to constitute the final enhancement, the lateral flanks of said mold comprising at the level of the layer of cellular concrete slits for the formation in the concrete of the rebates intended to support the interjoists. 4. Method according to claim 3, characterized in that the interjoists are molded upside down, the plastic foam enhancement constituting the bottom of the mold on which the plastic cellular concrete cream with closed cells is directly poured in thickness up to complete filling of the mold, its upper surface then being carefully leveled! 25 to the rule. 5. Method according to claim 4, characterized in i that the interjoists are molded in place on a bottom. Of oiled mold fi i. by pouring closed cell cellular plastic concrete up to a level higher than that of the support rebates, the mold being 3. then closed by placing the insulating plastic foam riser p with application of pressure to force the concrete cell in i | rebates. ! Drawings: —to— plates | _JL ........ pages of which ..... À .......- pane de c? Rde _! ___......... description description I _ Jl ....... p; r.'sr of claims! ........ λ ........ description Luxembourg, le -B EcV. ΐδ58 The Π! ta i iô i f Vf ί Charles München