FR2633322A1 - Spreader for irons in formworking, consisting of an elongate central part and, arranged at the ends of this, two connection heads - Google Patents

Abstract

The invention relates to a spreader for irons in formworking. The spreader consists of an elongate central part 4 at the ends of which is arranged a connection head 5, 6; it is monobloc and is made of plastic material. The connection head 5, 6 is a convex polyhedron whose faces 7 are provided with notches for the lateral engagement of the concrete irons 9, the said notches 8 are offset symmetrically with respect to one another in order to permit the crossing of the said irons 9. The inlet of the notches 8 comprises a flange for blocking the escape of the said irons. The invention applies to concrete formworking.

Description

 The subject of the invention is an iron spacing spacer for formwork formed by a slender central part and at the ends of which are arranged two connection heads; it allows the reinforcement to be kept at a distance from the concrete steel formwork in a regular and rigid manner.

 Currently, the means used are as follows - When the concrete irons are in place, it is necessary to install concrete wedges, then to install the steel spacers. The spacers are attached to the irons by ties using wire. All these operations require time, the use of different parts and a certain technicality on the part of the person who sets up the concrete irons for formwork.

The state of the art can be defined by the following patents
- FR-A-2.576.950 - Device for holding in place a prop for supporting the formwork, characterized in that it comprises a plate connected to its lower face with a rod and at least one projecting part or on the upper face of the plate.

 - FR-A-2.043.214 - A forestay for a formwork intended for pouring concrete comprises a frame comprising a first formwork support element, a second element offset from the first, reinforcing elements rigidly connecting the first and the second element, connecting pivots arranged at one end or at both ends of the first element and an adjustable element which is articulated to the second element and which bears on the corresponding second element of a neighboring frame so that when the first elements of neighboring frames are connected together end to end, by adjusting the length of the adjustable element, the angle between said first elements is varied.

 - FR-A-2.254.701 - The lowering device with which a forestay is provided according to the invention is a U-shaped lever, pivotally mounted on an axis perpendicular to the forestay at one end of the latter. In the service position, this lever is vertical and locked by a pin engaged in the aligned holes of the lever and the forestay When the formwork is to be lowered slightly, the lever is unlocked and it is pivoted by hand out of its vertical neutral position. The formwork turns the lever abruptly as soon as it leaves the vertical position and falls on a roller carried by the axis and located between the two arms of the U-shaped lever. In the service position, the formwork rests on the part rounded median connecting the arms of the U-shaped lever.

 The spacer, according to the invention, makes it possible to carry out the three operations mentioned above in a single one, therefore, very significant time saving (installation of wedges, installation of spacers, binding of spacers on concrete irons). In addition, the installation of the spacer, according to the invention, does not require any particular knowledge.

 The spacer, according to the invention, is formed by a slender central part at the ends of which is arranged a connection head.

 The connection head is a convex polyhedron of which at least one of the faces is provided with a notch for the lateral interlocking of the concrete irons.

According to other embodiments, each face is provided with a notch for the lateral nesting of a concrete iron. Said notches are offset symmetrically with respect to each other to allow the crossing of said bars and thus form a connecting spider.

 The spacer is monobloc. The spacer is made of plastic.

 The entry of the notches comprises a bead blocking the exit of said irons.

 The spacer is a single piece, preferably made of plastic.

 The notch has a height which varies according to the diameter of the concrete reinforcement to be introduced laterally.

 The depth of a notch does not exceed the web of the spacer to maintain its rigidity.

 The connection heads can be bevelled at their face to save material.

 The attached drawings are given as indicative and non-limiting examples. They represent a preferred embodiment according to the invention. They will allow the invention to be easily understood.

 Figure 1 is a schematic view of a metal spacer according to the prior art.

 Figure 2 is a schematic view of a spacer according to the invention.

 Figure 3 is a perspective view of the spacer according to the invention highlighting the faces A and B.

 Figure 4 is a perspective view of the spacer according to the invention highlighting the faces C and D.

 Figure 5 is a side view of the spacer along side A.

 Figure 6 is a side view of the spacer along side B.

 Figure 7 is a side view of the spacer along side C.

 Figure 8 is a side view of the spacer along side D.

 FIG. 9 is a perspective view of a spacer put in place to maintain the spacing between formwork bars.

 The state of the art is shown in FIG. 1 or, with the concrete irons 1 being put in place, it is necessary to place concrete wedges 2, then to install the steel spacer 3. It is then necessary to tie up the spacer 3 to attach it to irons 1.

 The spacer, according to the invention, is formed of a central part 4 with a connection head 5, 6 disposed at each of its ends.

 The connection head 5, 6 is a convex polyhedron of which each face 7 is provided with a notch 8 for the lateral fitting of the concrete irons 9. Said notches 8 cross from one face to the other and are offset symmetrically , relative to each other, to allow the crossing of said concrete irons 9 and thus form a connecting spider. According to a preferred embodiment, the connection head 5 or 6 has four faces 7.

 Of course, a connection head can have one, two, three or four notches, depending on the number of faces. Similarly, the depth of the notches depends on the number of notches and this, to avoid that the connection head is too weakened by the loss of material.

 The entry of the notches 8 comprises a bead 10 for blocking the exit of the said irons 9. The embedding of the concrete irons 9 with the notches 8 of the spacer is done naturally with rapidity by simple pressure.

The bead 10 prevents the removal of the spacer during concreting.

 The connection heads 5, 6 can be bevelled on their faces so as to save material. The connection head can thus be formed by the assembly of two trunks of regular or irregular pyramids.

 In FIG. 9, the spacer maintains the bars 9 of a first formwork element and the bars 11 of the second formwork element.

 The spacer has variable dimensions in thickness and length according to concrete standards.

- Example, for a 15 cm concrete wall, the length of the room is 15 cm.

 LIST OF REFERENCES 1. CONCRETE IRON 2. CONCRETE SHIM 3. SPREADER 4. CENTRAL PART OF THE SPACER 5, 6. A CONNECTION HEAD 7. POLYEDER FACES CONVISE THE CONNECTION HEAD 8. NOTCHES 9. IRONS CONCRETE 10. LOCKING BAND 11. IRONS

Claims (7)

 1. Iron spacing spacer for formwork to hold in place the concrete irons at regular distance from the formwork elements, characterized by the fact  that it is formed of a central part (4) elongated at the ends of which is disposed a connection head (5, 6).  2. Spacer according to claim 1 characterized by the fact  that it is in one piece.  3. Spacer according to any one of claims 1 or 2 characterized in that  that it is made of plastic.  4. Spacer according to any one of claims 1, 2 or 3 characterized in that  that the connection head (5, 6) is a convex polyhedron of which at least one face (7) is provided with a notch for the lateral interlocking of the concrete irons (9), said notches (8) are offset symmetrically one relative to the others to allow the crossing of said irons (9).  5. Spacer according to any one of claims 1, 2 or 3 characterized in that  that each face is provided with a notch for the lateral interlocking of the irons.  6. Spacer according to any one of claims 1 or 4 characterized in that  that the entry of the notches (8). includes a bead blocking the exit of said irons.  7. Spacer according to any one of claims 1, 2, 3 or 4 characterized by the fact  that the connection heads (5, 6) can be bevelled at their face to allow a saving of material.