BACKGROUND OF THE INVENTION There are known joinings of groove and tongue type for the assembling of two or more elements, one following the other, for example panels which limit closed spaccs.

Such a joining requires some profilated coupling elements, placed on the edges of the panels or plates which are to be assembled and, when pushed, behave elasticity, merge and enclanch themselvcs, achieving a forced mechanical connection. Both the groove and the tongue are provided with longitudinal channels in which there are introduced elastic bodies, rubber for example, for tightening (Patent FR 2512921).

This joining has the disadvantage that during the working period the binding elastio forces between the groove and the tongue diminish so that the joining becomes weaker, with limited mechanical strength.

Another disadvantage of this joining oonsists in the fact it need to be processed or order to achieve the channel configuration on the lateral faces of the groove and the tongue. To this shall be added also the disadvantage that the joining raises difficult items in what concerns the deformations resulting from the meal contraction and expansion, which may submit the assembly to abnormal stresses.

Another joining of this type request binding profilated columns, provided with one or two corner profilated parts, an inferior supporting bar, a superior pressure bar, a pressure screw and a lateral blocking plate (Patent FR 2524606).

This joining presents the disadvantage it has a complex construction, an increased consummation of materials and manpower, being expensive both in manufacturing and in mounting.

Additionally, it achieves only straight line and right angle joining.

DISCLOSURE OF THE INVENTION The technical problem which has to be solved by the invention consists in achieving a joining which to have a simple and resistant construction, to give possibility of being made of a large range of materials, not to need screws or boring, welding, riveting operations and to ensure a fast assembling, on site, with the lowest consumption of materials and manpower, of at least two adjacent elements, for example coplanar panels or panels in different planes, according to one or more directions, to one or more faces, at variable angles, on border or in plane.

This joining with multiple uses according to the invention solves this technical problem and removes the said disadvantages by that it consists of a mobile joining and stiffening beam, which is of an oblong form, has in its section two prominences placed on the body of a central elements and it penetrate with these prominences into some grooves practiced in the bodies which are to be joined, placed, previously, adjacently, in the position groove groove, these grooves being possible to be practiced on some frontal surfaces of the elements which are to be joined, on their lateral surfaces or both on their frontal and lateral faces, being possible that the be also placed on separated bodies which shall be applied on a cove which can be a panel or other element. The joining and stiffening beam has a length equal to the length of the grooves and it is made of a central plate and some wings, having the role of supporting chord, which extend in both sides towards the central plate and have a different geometrical forms, for example rectangular, circular, polygonal, bifurcated or swallow tail form. In another constructive variant, the mobile stiffening beam is made of a bar and some limitations fixed on it. A

limitator request two ankles parts with some parallel wings, placed at a distance equal to the diameter of the bar and some coplanar wings upon which is placed transversally and jointly, in their central third part, a chord of another similar part having a hole practiced in the central zone of the chord, adjacent to a vertical wing. Two successive limitators are fixed with the bar so that the ankles parts of all the limitators be paralleled among them, and the vertical wing of the corner shaped parts be tangent, alternatively, to two diametrally opposed generators of the cylindrical surface ofthe bar. The elements which are to be joined are plate, prismatic bodies or bodies with any other form, of which plane, curved or polyhedral surfaces can be brought in contract in the mentioned adjacent zones. The grooves are U shaped and each of them presents a bottom, some sides and some arms oriented inward, toward the symnietry axis, forming a kerf between them, being possible that have also another configuration, for example circular, polygonal, bifurcated or swallow tail form, in concordance with the complementary forms of the prominences of the stiffening beam.

The grooves of L shaped joining are practiced in a frontal surface of an element and in a lateral surface of the other element, the grooves of a T shaped or an intersection joining are practiced in some frontal surfaces on the two elements and on both lateral surfaces of another element, and those which fix also a level plane are practiced also according to a second route on each lateral surface besides those mentioned. A groove of a joining between elements placed under angles different from 900 shall be practiced in a frontal, bevelled surface and they shall associate with a groove practiced in a frontal surface of the afferent element or in another frontal bevelled surface. The grooves practiced in the frontal surfaces, bevelled at variable angles determine bodies having in section a triangular, rectangular, pentagonal, hexagonal or other geometrical form at wish.

The joining elements may also have the form of a frame which is to be applied from exterior, on the sides of the panel and having on its exterior part grooves with the chosen configuration. Depending on the material used, both the assembly groove-groove and the mobile stiffening beam being possible so be obtained by moulding, pressing, rolling, drawing, cutting, welding, soldering, etc.

The joining with multiple uses according to the invention presents the following advantages: - has a simple and solid construction, - does not need nails, screws, rivets, binding materials, nor boring, welding etc. operations, - ensures the mounting in plane and in spare of the elements which are joined; - can connect between them elements made of different materials, with complex forms and large scale variable dimensions.

BRIEF DESCRIPTION OF THE DRAWINGS Further on is presented an example of achieving the joining with multiple uses according to the invention, applied in civil engineering, in connection with fig. 1-18 which represent: Fig. 1 - Cross section through a groove-groove joining according to one direction between two coplanar panels; Fig. 2 - Axonometric view of grooving and tonguing, according to two directions, of a wall panel, placed in the field; Fig. 3 - Axonometric view of the joinings, according to three orthogonal directions, of a corner intersection panel; Fig. 4 - Axonometric view of the joinings, according to three directions, of a floor panel; Fig. 3- Axonometric view of the joinings, of a framing panel; Fig. 6 - Mobile joining and stiffening beam; Fig. 7 - Mobile joining device; Fig 8 - Another variant of the joining device from Fig. 7; Fig. 9 - Axonometric representation of an architectural ensemble built of panels provided with groove-groove joinings; Fig. 10 - Axonometric representation of a corner ensemble; Fig. 11 - Characteristic cross section A-A through the ensemble from Fig. 10; Fig. 12 - Characteristic cross section B-B through the ensemble from Fig. 10; Fig. 13 - Characteristic view ofthe ensemble from Fig. 10; Fig. 14 - Axonometric representation ofthe joining of a framing ensemble;

Fig. 15 - Characteristic cross-section C-C through the ensemble from Fig. 14; Fig. 16 - Characteristic cross-section D-D through the ensemble from Fig. 14; Fig. 17 - Characteristic view of the joining from Fig. 14; Fig. 18 - Axonometric representation of the joining of a ridge ensemble.

MODE OF CARRYING OUT THE INVENTION The joining (fig. 1) request an element 1 and an element 2 which are connected between them by means of a bar or a mobile stiffening beam 3.

The elements 1 and 2 may be plate bodies or bodies having other form, for example prefabricated panels for walls, floor or ceiling, which join between them, a foundation and a wall, a framing and supporting beam or any other bodies of which plane, curved or polyhedral surfaces may be brought in contact in some adjacent zones a, b in each of the aforesaid frontal contact surfaces, a, b, there are practiced some grooves, c, d, which, when mounted, occupy a symmetrical position "groove-groove" and are meant to receive at the same time, two sides of the bar or stiffening beam 3. In the example shown (fig. 1), the grooves o, d are U shaped, each of them presenting a bottom c, some sides f and some arms g, which are oriented inward, toward the symmetry axis of the groove, forming between them a kerf h. The said grooves may also have another configuration, for example circular, polygonal, bifurcated or swallow tail form, they forming, in all the cases, the kerfh and keeping, when mounted a groove-groove symmetry laying.

These grooves may be practiced in a frontal surface (thickness) (fig. 1), in two or more frontal surfaces (fig. 2) or in two lateral surfaces and in the frontal surfaces (fig. 3) being possible that they be associated in varied combinations of grooves on the frontal surfaces and on the lateral surface (fig. 4) in order to achieve one plane joinings, one direction (o, y) joinings and two orthogonal directions (O, x, y) joinings or three orthogonal directions (0, x, y) space joinings. In all these cases, the contact frontal surfaces a, b and the lateral surfaces i, j of the elements 1, 2 form between them an angle

a=90° . If the surface a of the element 1 is bevelled at an angle Oo < 900 toward its lateral surface I (fig. 5), then this surface forms an angle r 900 +p with the surface j of the element 2. By successive assembling of elements so placed shall be obtained uniformly deviated routes with the angle p, in a single sense, being possible to achieve closed spaces with varied geometric configurations, determined by this angle and its value. These configurations may represent perimeters of useful spaces, closed, or opened channel sections, framing works with varied configurations etc. If both contact frontal surfaces a, b are bevelled, simultaneous, equal deviations of both elements 1, 2 shall be obtained symmetric configurations with equal inclinations, such as the framing (fig. 18) where an angle y is formed, having for example 450 Besides the joining with grooves practiced in a frontal surface and a lateral surface, such as it was shown before, a right angle joining, according to Ox, y axis, may be also achieved by association of two adjacent elements having the frontal surfaces a, b bevelled on both elements at 450 or at other angle, depending on the configuration desired. In this way, varying the value of the angle , may be obtained premises and bodies with triangular, rectangular, pentagonal, hexagonal form in section.

The stiffening beam 3 (fig. 6) represents a body which has the role of being introduced in the grooves o, d in order to make the connection between the elements 1, 2 and together with these to ensure the union and the strength of the structure achieved by the joining of these elements. Its length is equal with the aforesaid c, d grooves, forming a H shaped profile, determined by the association of the grooves in the mounting position, when the surfaces a, b of the elements 1,2 are adjacent. The beam is made of a central plate k, and the prominences 1 at its ends, having the role of support chard. These prominences extend themselves, to both sides and perpendicularly on the central plate k; with the equal wings m. In the said case, the chord 1 have rectangular form in section, but having the complementary profile of the grooves c, d they may have another convenient form for example circular, polygonal, bifurcated or swallow tail form, as it was shown above relating to the mentioned grooves. In another constructive variant, the stiffening beam 3 is made under the form of

a device A. This device is made of a bar 4 and the limitators B fixed at equal distances on the bar 4. A limitator B request two ankle shaped parts 5,6 having the wing n parallel at a distance equal to the diameter of the bar, and the wings p being contained in the some plane (coplanary). Another similar part 7 lays transversally on the parts 5, 6 so that it occupies the central third part of their length and it is fixed together with them through the strings r. In the chord s which io in contact with the wings p of the parts 5, 6 is practiced a pierced hole t having its diameter equal to the diameter of the bar.

The limitators B so assembled shall be introduced on the bar 4, which passes through the wings n of the ankles 5,6 and the hole t of the part 7. They shall be fixed at equal distances on the bar 4, along with the zones of contact with this and in such a manner that the ankles 5, 6 of all the limitators be parallel between them and the vertical wings U of the transversal ankles 7 of two adjacent limitators be tangent to two generator diametraly opposed of the cylindrical surface of the bar 4. The limitators B shall be fixed on the bar 4 with the strings v.

The stiffening beam from the fig. 8 has a similar construction and it differs from the one from the fig. 7 only by the fact it has two adjacent limitators B mounted "in mirror" in order to achieve together the H shaped configuration.

Depending on the conditions of strength and mobility request, the joining and stiffening beam 3, as well as the limitators B of the stiffening device A shall be executed with precision in the limits of a tolerance field in order to achieve a drive fit or a easy running fit, which, on the one hand will ensure slip joints and plays which to take over the dimensional variations in case of thermal dilatations and, on the other hand, to confer a relative mobility of the elements of the structure, for example in case of earthquake.

Depending on the destination and the place of the mounting of the construction elements, the groove-groove joinings may be simple or combined.

The grooves e of an plane element 1 (fig. 1), which defines the orientation of a wall according to the axis Ox and together with other elements shall be mounted on the poles without superposition according to the height and without need to be fixed on a foundation,

are practiced only on the parallel sides which join according to the axis Oy and they constitute the height.

If the said element is overlapped according to the height, at both extremities, or is fixed with an extremity in a foundation then is provided with one grove cl, c2, G3, c4 on each of the four frontal surfaces (thickness) of its sides, parallel to a orthogonal axis system O,x,y (fig. 2).

In order to achieve a L shaped ankle joining, a T shaped joining or a intersection joining, which joining has also superposition according to the height, then the grooves cl, c2, c3, c4 practiced in the frontal surfaces, shall be associated with the grooves o5, c6, practiced in one, respectively on both lateral surfaces i (fig. 3).

when besides the joining achieved through the grooves cl ... c6 from the fig. 3, these are also necessaryjoinings for a level plane (fig.

4), then on both faces of the surfaces i of the element 1 shall also provided a groove c7 and a groove c8.

In fig. 9 is presented, in axonometric view, an architectural ensemble, which all the elements between the field panels 8, ankle panels 9, ceiling panels 10 and framing panels 11 as well as between them and the foundation 12 are groove-groove joining types.

The foundation is made of reinforced concrete with steel bars 13 which are connected with a part provided with the hooks 14 fixed on a plate 15. The foundation slabs 16, 17 are provided with a groove G9 over which is overlapped the groove clO ofthe ankle panels 9 and in which shall be introduced mobile stiffening beams 3.

The connection between the ankle panels 9, as well as between these and a floor panel 18 is ensured by joining ol c6, respectively cl .... c8, such as it was shown in the fig. 3 and 4. The grooves cl, c3, c5, c6 from the superior part of the ankle panel from fig. 10, as well as the stiffening beams 3 may be seen in the section A-Afromfig. 1 1, as well as in the section B-B from fig. 12. In fig. 12 is seen the connection between two panels disposed in L which is made of groove-groove joinings disposed on a corner panel 9 with three grooves cl, c2, c3 placed on the front surface and on the lateral surfaces and a simple field panel with grooves c 1, c2 places on the frontal surfaces (thickness).

The panel with three grooves ensures also the achievement of an intersection between two directions.

A view of the corner joining from fig. 10 and of the joining which ensure the connection in an intersection of two directions is shown in fig. 13.

In fig. 14-18 there are shown views and characteristic sections through groove-groove joinings of building elements from the zone of the ceiling and the framing of a building. A groove of the joinings from the supporting zones are the structure of the walls and the floor (fig. 14, 15, 17, 18) is processed perpendicularly on the bevelled surface toward the lateral plane of the panel and it joins with a groove processed in the superior lateral surface of the floor panel, and in the zone of the roof, the grooves from the two supporting surfaces of the panels are processed in bevelled surface such as it was shown before in reference to fig. 5. The joinings grooves between to adjacent panels from the field of the framing are processed in the frontal surfaces (thickness) at a right angle towards the lateral surfaces of the respective elements.

It is underlined the fact that, depending on the material used for the panels which are to be joined (wood, metal, ceramics, glass, plastics etc.) both the groove-groove joining elements and the mobile stiffening beam may be obtained by different processing methods such as moulding, pressing, rolling, drawing, cutting, welding, soldering etc.

Besides the grooves practiced directly in the body of the panels which are to be joined, the joining assembly may be achieved also separately, following it be mounted on the panel or other element.

In the experiments made by the author, the panels were made of DURREF materials and they were bordered with metal under the form of a frame which surrounds the panel and reinforces it, this frame being provided in exterior with joining elements.

As part of the invention concept, the examples presented are not limitative but they have only the role to illustrate a manner of achievement.