A better solution for the concrete boxes normally used in the fungiform pavements

Abstract: This invention is to be used in fungiform concrete floors. It's is made by a box (1) of plastic material (any polymer) characterised to have feet (5) wich permit to keep a distance from the bottom of the box to the form-work and like that permitting a total envolvement by the concrete (12). With this invention it's possible to make simultaneousely the floor of the superior floor and the roof of the inferior floor(16 and 12). Because of his form - truncated pyramidal - the transport (20) his very easy and cheap. The box is also cheaper than the normal concrete boxes because it can be made of recycled plastic. On the other hand it's easier for workers to manipulate them because of his light weight and easy distribution in the work.

Description: The invention we proprose here is a better solution for the concrete boxes normally used in voided concrete roof constructions. These traditional boxes in concrete are composed of three pieces because they are very heavy, and because of that they took too much time to be manipulated. More than that the traditional boxes in cement concrete are very expensive to transport because of their form weight and they make what can be called the "drum effect". And at last the traditional cement boxes are very fragile and more than 8% suffer breakage during manipulation or transport. An element of a type similar to that of the present invention is disclosed in US-A-3,328,932. In this invention the material used is plastic (any polymer) recycled or not, which makes the boxes (1) composing the alveoli of the voided concrete roofs lighter (not so heavy) and making, of course, the pavement lighter. Because of his formation the "drum effect" does not occur. On another hand these boxes are made in only one piece wich permits an easy manipulation and saves costs in construction. Also the transport costs can be reduced because of the mortise way of transport and it's pyramidal truncated form. Because of its very light weight it is possible to assemble the iron before and the boxes after which allow a better and quicker manipulation. Notwithstanding their low density the boxes have some holes (7) in the superior part where they can be tied to the iron if necesary. As a big diference and innovation to the traditional cement boxes these boxes have feet (5) wich gives a distance to pass down the concrete and permits the total involvment of the box by the concrete and, like this, the simultaneous execution of the superior pavement(16) and the roof (12) of the inferior floor. The binding pieces (3) have the function of connecting the boxes (1) together. The roof of the inferior floor is suported by a net (in plastic or not) (10) which is adapted automaticaly by compression to the feet of the box(19). This does not happen traditionally because the concrete boxes are put directly in the form works and it is necessary to finish the roof later with supplementary costs. In the domain of voided pavements there are other solutions more complex and expensive than this invention we propose because they don't fill all the requisites of this plastic box because they are different materials or because they don't allow a perfect finish work or because they are recovered form works. As an innovation we have also a candlestick (9) support for the electric tubes and others. These candlesticks can be placed in different holes(8) of the box cover(2) in order to make a map of the distribuition and easier repair later on any inconvenience in the electric system. Naturally the cover holes will be closed with plastic bottoms when they are not in use in order to not permit the concrete to invade the box. 1-BOX 2- COVER 3- BINDING PIECES 4- STRUTURE CONES 5- FEET 6- COVER BOLT 7- BINDING HOLES 8- COVER HOLES FOR CANDLESTICKS 9- CANDLESTICK OF TUBES CONDUCTION 10- NET 11- HOLES TO FIX THE BOX TO IRON 12- ROOF OF INFERIOR FLOOR 13- CONCRETE FINISHING 14- UPPER PAVEMENT 15- FINISHING CONCRETE 16- SUPERIOR PAVEMENT 17- IRON NET 18- CANDLESTICK DETAIL 19- FOOT DETAIL 20- BOX MORTISE FOR TRANSPORT

Claims: An element to be used in civil construction in the field of voided pavements, said element intended to create alveoli which can not be invaded by concrete, said element being composed of recycled or original plastic and characterised by comprising a box (1) with a pyramidal truncated form and a covering (2) which covers the box and does not allow the concrete to enter the box, the box (1) comprising interior truncated cones (4) which support the forces in the covering (2) and the weight of workers or the weight of a concrete layer of up to 30 cm, said box (1) further comprising feet (5) also in a truncated cone form, the underside of the box being supportable at a distance from form works by means of said feet which allows the concrete to pass down the box, said element further comprising a lower net (10) of a plastic or non plastic adapted by compression to said feet, the covering (2) having some holes (8) which can be used to receive supporting means with different diameters, which diameters can receive electric tubes and other tubes. An element according to claim 1, characterised in that , because of its configuration and of said feet (5) it may be totally involved in the concrete. An element according to claim 2, characterised in that , because of its configuration and of said feet (5), the simultaneous execution of the superior pavement (16) of the superior floor and the roof (12) of the inferior floor is possible. An element according to claim 1 characterised in that , because of the pyramidal truncated form of the box (1) allowing boxes to be inserted one into the other, a very easy and multiple transport or distribution in works operations of said elements in big quantities is possible. An element according to claim 1 characterised in that the net (10) can be easily put at the bottom of each box to aggregate the concrete. An element according to claim 1 characterised in that the box (1) is comprised 100% of recycled plastic. An element according to claim 1, characterised in that it further comprises a binding piece (3) for connecting neighbouring boxes (1) together. An element according to claim 1, characterised in that said supporting means consist in pieces in form of a candlestick support (9) with different diameters to receive and maintain said tubes superficially embedded in the concrete.

Inventors: FERREIRA REBELO EDUARDA FANHA, FERREIRA REBELO, EDUARDA FANHA N.
Applicants: FERREIRA REBELO EDUARDA FANHA, FERREIRA REBELO, EDUARDA FANHA N.
Application year: 1998
Main classification: E04B5
IPC codes: E04B5