WO2011064644A1

WO2011064644A1 - Movable plant for producing concrete

Info

Publication number: WO2011064644A1
Application number: PCT/IB2010/002979
Authority: WO
Inventors: Andrea Marcantonini
Original assignee: Andrea Marcantonini
Priority date: 2009-11-27
Filing date: 2010-11-22
Publication date: 2011-06-03
Also published as: ITPG20090061A1

Abstract

Mobile plant (1 ) for producing concrete, comprising at least a first conveyable module (2) wherein the group for mixing (3) aggregates is accommodated, characterized in that said mixing group (3) is horizontally shiftable between a first position wherein it is disposed inside said at least a first module (2), at least during the conveying step of said plant, and a second position wherein it is cantileverly disposed, at least partially, outside said at least a first module, at least during said plant operation.

Description

"Movable plant for producing concrete"

***

FIELD OF THE INVENTION

The present invention refers to a mobile plant for producing concrete. Particularly, the present mobile plant for producing concrete is used most of all in geographic areas, or countries, wherein it is not easy to realize plants for producing concrete because of logistic difficulties or because of lack of skilled personnel. Also, such a plant type is used everywhere the need of plants having a simple structure and being easily movable is high. For example, such plants are advantageously used in building, or road, sites, or where such a frequent displacement of such plant is expected.

KNOWN PREVIOUS ART

According to the known art, for meeting the afore said requirements, mobile plants for producing concrete have been realized, comprising one or more conveyable modules, by sea and / or by land, and that might be combined one to each other for obtaining a plant for producing concrete directly at the site where the production of concrete is needed. Such plants are quite simple to assembly and they do not need skilled personnel.

The document US6832851 describes a mobile plant for mixing concrete comprising components such as, for example, the hoppers, the mixing group, the saddle for conveying the aggregates, or skip, one or more horizontal and / or vertical conveyor belts, contained in a plurality of modules, or containers. Still according to the US Patent US6832851 , such modules, just defined conveyable, are themselves adapted to be conveyed by sea and / or land, that is to say they are provided with elements such the isocorners, for example, also defined corner blocks, allowing to be gripped and raised in every harbor or deposit wherein they are stocked, and with a frame that is so resistant to be stocked in organized stacks. Further, when the plant is operating, the modules are also the supporting structure of the same plant for mixing the concrete.

Further, also the Swedish document SE440879 describes a mobile plant for mixing concrete, composed of more modules conveyable by sea. In this case too each module, or container, is also the supporting structure of the mixing plant when the latter is operating.

At last, the document FR2607053 describes a mobile plant for producing the concrete, obtained as a whole conveyable unit. In such a conveyable unit one or more hoppers are accommodated, that can be conveniently obtained by rotating the walls of the same unit, a conveyor belt tilted relatively to the horizontal plane, a conveying saddle, sliding along a vertical guide, and a mixing group. According to said patent, the mixing group can rotate between a first position wherein such a group is disposed inside the unit, and a second position wherein such a mixing group is disposed outside the unit, in an operating position. It has however to be observed that, differently from the US and SE Patents afore mentioned, such a plant type cannot be conveyed by sea and / or land if it is not before inserted in a module, or container, adapted for being conveyed itself by sea and / or land. In conclusion, the afore said conveyable unit could not sustain by itself the weight of one or more modules stacked over the same. From above it follows that the freedom of rotating movements of the mixing group present in the plant described in the FR2607053 patent is assured only because the unit does not comprise any frame adapted to modify such an unit in a module, or container, that can be conveyed by sea and / or land. In fact, in case of a frame adapted to transform the unit in a module conveyable by sea and / or land, giving the module the usual parallelepiped shape, the mixing group could not rotate with the same movement freedom described in the French patent.

The afore said mobile plants, wherein the module can be conveyed, are not free of drawbacks. In fact, no one of the modules composing the generic plant for producing concrete allows to fully exploit the whole length of the single module for increasing the productivity of the same plant. In fact, the overall dimensions of the mixing group are no way made up for and, therefore, every single module has to be designed counting also the overall dimensions of the other components present in modules and allowing the plant operations such as, for example, the saddle for loading the aggregates, that passes side by side the mixing group for draining the aggregates inside. Further, the mixing group has to be placed at such a height to allow the filling of a concrete truck for conveying the concrete obtained in the mixing group. Unfavorably in the Swedish patent SE440879, to compensate for such a drawback, it is necessary to arrange a further module under that accommodating the mixing group. Such a further module inside the plant, however, has no other function than that afore reported.

On the contrary, in the case of the French patent FR2607053, the space between the inner hopper and the mixing group is used for accommodating the saddle, or "skip", and allowing it to displace along the vertical guide integral with the mixing group. Therefore such a space is no way used for increasing the same mixing plant productivity.

It is therefore an object of the present invention to realize a mobile plant for producing concrete allowing to increase the productivity of the same plant completely using the module length over which the mixing group is accommodated.

Further, an object of the present invention is to realize a mobile plant using as few conveyable modules as possible by sea and / or land although assuring high productivity.

Further object of the present invention is to realize a mobile plant which installation could be made rapidly and without the need of skilled technicians.

Finally, object of the present invention is to confine inside the modules composing the plant all the elements necessary for the operation thereof.

SUMMARY OF THE INVENTION

Such objects are carried out by the present mobile plant for producing concrete, comprising at least a first conveyable module wherein the group for mixing aggregates is accommodated, characterized in that said mixing group is horizontally shiftable between a first position wherein it is disposed inside said at least a first module, at least during the conveying step of said plant, and a second position wherein it is cantileverly disposed, at least partially, outside said at least a first module, at least during said plant operation.

In such a way, the single module can be used in all its length, allowing to completely use the space occupied by the mixing group during the step of conveying the module wherein it is accommodated. Further, when the module is disposed in the assembling position, the plant is operated simply by horizontally moving the mixing group outside said at least one first module, thereby allowing to use the space taken up before by such a mixing group inside the first module, in addition to aid the drain of the concrete out of the afore said first module. This is extremely advantageous in case wherein the plant is composed by one or more modules, as represented in the Swedish patent SE440879. In fact, in the plant described in the Swedish document, the horizontally displacement of the mixing group could allow to have hoppers the outlets thereof are disposed over almost the whole module length placed over that accommodating the mixing group, and not only over a portion of the same.

Particularly, according to an embodiment herein illustrated, said at least one first module, as afore mentioned being conveyable by sea and / or land, comprises at least one first hopper disposed near said mixing group. Further, the mixing group is provided with at least one portion of vertical guide integrally constrained to the afore said mixing group along which a saddle, or skip, is constrained to slide for conveying the aggregates. It has to be observed that the afore said arrangement allows to increase the aggregate measurement of masses that can be treated in the module relatively to the volumes treated in the modules described in the known art documents.

According to the invention, such at least one first module comprises a frame adapted to form the container structure for conveying such a module by sea and / or land. Such a frame comprises a number of horizontal and vertical beams able to produce a typical parallelepiped structure preferably having dimensions according to the in force regulations for allowing the conveying thereof by sea and / or land. Such a frame is further the same used for sustaining the plant, when it is assembled and operating, carrying out an important role.

According to the invention too, said at least a first module comprise at least one rotatable wall for closing / opening said at least a first module and one or more locking elements for holding the wall in a substantially horizontal position.

Further, said rotatable wall is provided with at least one opening that, when said mixing group is in its second position and said rotatable wall is in the horizontal position, is disposed at an outlet of said mixing group for draining the concrete produced by said mixing group. In such a way, in case wherein said at least a first module is disposed raised from the ground, it is possible to drain the concrete on mechanical means such as, for example, dumper, power shovels or little cement mixers, or on cement mixers too, but only after the earth moving civil operations have been prearranged. In such a way the afore said mechanical means could be easily filled placing under the opening obtained in the rotatable wall. Further, such a rotatable wall, once it is disposed in a horizontal position, may be used for allowing the technicians to inspect the mixing group.

Further the plant comprises at least a second module disposed under said first module and comprising a first conveyor and / or weighing belt for aggregates coming out from said at least a first hopper, towards said at least one saddle. Such a second module further comprises at least one second portion of vertical guide that, at least when said mixing group is in its second position, can be combined with said at least one first portion of vertical guide. In such a way it is possible to use the whole module length the mixing group is accommodated thereon, allowing also the saddle, or skip, sliding, when the plant is operating. Such a solution further allows to use only two modules using the whole maximum possible length of the module wherein the hoppers are placed. The plant is then able to produce a high amount of concrete per length unit of the single module.

According to an alternative embodiment of the invention, the plant comprises at least a third module provided with at least a second hopper, and at least a fourth module, provided with at least a second conveyor and / or weighing belt for aggregates and disposed under said at least a third module; said at least a third and fourth module being disposed side by side to at least a first and second module. In this way it is possible, in an easy way and without employing big efforts, to increase the plant productivity employing two additional modules.

It has to be mentioned that the afore said second conveyor and / or weighting belt for aggregates is shiftable between a first position wherein it is disposed inside said at least a fourth module, at least during the conveying step of said plant, and a second position wherein it is disposed, at least partially, over said first conveyor / weighting belt, outside said at least a fourth module, at least during said plant operation. In this way the aggregates drained by the second hopper on the second conveyor and / or weighting belt may be carried to the first conveyor and / or weighting belt and then, by the afore said saddle, or skip, to the mixing group. This is simply obtained by shifting the second conveyor and / or weighting belt in such a way that a portion thereof is inside the second module and then outside the fourth module.

Finally, the plant provides that said first and / or second hopper comprises at least one U shaped wall rotatably anchored to the frame of said at least a first and / or a third module and able to rotate between a first position wherein said first and / or second hopper is closed, at least during the conveying of said first and / or third module, and a second position wherein said U shaped wall is tilted outside said at least a first and / or third module, at least when said plant is operating. Particularly, such a solution avoids the need of realizing hoppers using bolted or welded systems. This would require time and also skilled technicians not always easily available in areas wherein such mobile plants are designed for. The invention thereby allows to obtain one or more hoppers immediately ready for use simply rotating one or more U shaped walls of the module.

BRIEF DESCRIPTION OF THE DRAWINGS

For purposes of illustrations and not limitative, more preferred embodiments of the present invention will be now provided with reference to the accompanying drawings, in which:

figure 1 is a side view of the first module of the mobile plant for producing concrete wherein the mixing group is in its first position;

figure 2 is a side view of the first module of the mobile plant for producing concrete wherein the mixing group is in its second position;

figure 3 is a longitudinal section view of the mobile plant for producing concrete, wherein the mixing group, accommodated in the first module, is in its first position and wherein a second module is present;

figure 4 is a longitudinal section view of the mobile plant for producing concrete wherein the mixing group, accommodated in the first module, is in its second position and wherein a second module is present;

figure 5a is an exploded view of a module wherein the first three hoppers comprise three U shaped walls joined together; figure 5b is an axonometric view of two superimposed modules wherein the first module is provided with three hoppers with three U shaped wall joined together and in an open position;

figure 6 is an axonometric view of the guides for sliding said mixing group; figure 7 is longitudinal section view of the plant of figure 6 wherein the second conveyor belt is in its second position;

figure 8 is a longitudinal section view of the fourth module wherein the second conveyor belt is in its first position.

DETAILED DESCRIPTION OF SOME EMBODIMENTS OF THE PRESENT INVENTION

Referring particularly to such figures, with 1 is shown a mobile plant for producing concrete.

The mobile plant 1 comprises a first conveyable module 2 wherein a group for mixing 3 the aggregates (herein not shown) is accommodated. It has to be observed that with conveyable module it is intended a module having such dimensions and characteristics to be conveyed by sea and / or land, according the regulations for conveying such modules. For example, in the embodiment herein described, the first module 2 has a dimension of forty feet and it is provided with known hooking means (herein not shown), referred also as isocorner, or corner blocks, that are internationally standardized and allow the first module 2 to be moved inside every existing harbor, or stocking deposit. It has further to be mentioned that such a first module 2 is also provided with a frame 26 allowing its stacking on other similar modules. Such a frame 26 is composed of a number of vertical 26a and horizontal 26b beams conferring the module 2 the typical structure of parallelepiped. It has to be specified, however, that the module dimensions could also be different from forty feet, for example, also of twenty feet, provided that they are anyway internationally conceded for allowing the module to be conveyed by sea and / or land.

The afore said mixing group 3 for aggregates is well known in the art, and then it will be not afterwards described. According to the invention, such a mixing group 3 is horizontally shiftable between a first position (figure 1) wherein it is disposed inside said at least a first module 2, during the step of conveying said plant 1 , and a second position (figure 2) wherein it is cantileverly disposed, at least partially, outside said at least a first module 2, during the plant 1 operation. As can be seen from figure 2, such an axial displacement of the mixing group 3 allows to increase the available space inside the first module 2, thereby guaranteeing the possibility of using, if necessary also completely, the length of the module 2. Once the operating position is reached, the mixing group is blocked in position by appropriate stopping and / or fixing elements (herein not shown).

Always according to the invention, said at least a first module 2 comprises at least a wall 7 rotatable for closing / opening said at least a first module 2, and two blocking elements 8 (the figure 1 shows only one) for retaining the wall 7 in a substantially horizontal position. According to the embodiment herein described such blocking elements 8 comprise ropes and / or cables. It has to be observed that such ropes are preferably made of steel and also presents clamping accessories (herein not shown).

Further the afore said rotatable wall 7 is provided with an opening 9 that, when said mixing group 3 is in its second position and said rotatable wall 7 is in the horizontal position, is disposed at an outlet 50 of said mixing group 3. In such a way the concrete provided by the mixing group 3 could be drained through the afore said opening 9, underneath the rotatable wall 7.

It has to be observed that, for draining more easily the concrete through the afore said opening 9, an appropriate chute 91 having a truncated cone shape is prearranged on said opening 9.

As can be seen from figure 6, said at least one first module 2 comprises at least one guide 10 provided with at least two C shaped tracks 10a, 10b, adapted for allowing the horizontal shifting of said mixing group 3. It has to be observed that the C shaped tracks are installed into the module expressly turned towards the inside, so that the mixing group 3 could not release from the sliding seat neither during the transport nor during its horizontal displacement. In the same way the arrangement of the two tracks 10a, 10b allows to avoid any forward overturning risk of the mixing group 3 when it is in is second position. Still according to the present invention, said mixing group 3 comprises a first portion of vertical guide 17a along which at least one saddle 100, or skip, slides for conveying said aggregates. Such a first portion of vertical guide 17a is integrally constrained to the mixing group 3 and then slides therewith during the displacement between the first and the second position of the mixing group 3. Such a saddle 100, when the module is completely closed, could be constrained to the afore said first vertical guide portion 17a, or could be contained into a second module wherein the plant 1 is composed, or could be contained partially into the first module 2 and partially into a second module, and then assembled.

According to the embodiment herein described, said first module 2 comprises as well also three first hoppers 14 disposed near the mixing group 3 when the latter is in its first position. Such hoppers 14, that could be in a number different from three, for example, one or four, without therefore falling out from the protection scope of the present invention, are disposed side by side the first portion of vertical guide 17a, when the module is closed. As can be distinctly seen from figures 1 and 2, the mixing group 3, with the first vertical portion 17a, in case wherein it is integrally constrained to the mixing group 3, slide horizontally together when the plant is operated, so that to leave a clear space for allowing the saddle 100, or skip, to slide along the first vertical portion 17a. It has to be observed that, although the embodiment herein illustrated provides the presence of three hoppers 14, nevertheless the presence of further components in place of the hoppers 14, or with the hoppers 14, still fall in the protection scope of the present invention.

According to the embodiment herein illustrated, the plant 1 also comprises a second module 12 conveyable by sea and / or land, disposed under said first module 2, and provided with a first belt 15 for conveying and / or weighting the aggregates, coming out from the afore said first three hoppers 14 present in the first module 2 and being conveyed in the direction of the saddle 100.

Such a second module 12 further comprises a second portion of vertical guide 17b. The afore said first portion of vertical guide 17a, once the mixing group 3 is displaced in its second position, is exactly disposed at said at least one second portion of vertical guide 17b, coupled with it to allow the continuous vertically sliding of the saddle 100 between the first module 2 and the second module 12 and vice versa. The saddle 100 is indeed used for raising the aggregates 5 coming from the first conveyor and / or weighting belt 15 up to the mixing group 3.

It has to be mentioned that the first module 2 is free of lower walls, as can be seen in figure 5a and 5b, in such a way that the first portion of the vertical guide 17a, present in the first module 2, and the second portion of vertical guide 17b, present in the second module 12, are connectable one to each other, and the aggregates present inside each first hopper 14 could be then weighed out inside the second module 12. About that, the second module 12 presents appropriate inlets 29 obtained in its higher walls for aiding the dosing of the aggregates present in the first hoppers 14 into the beneath second module 12 and thereby reaching the afore said first conveyor and / or weighting belt 15.

According to another embodiment shown in figure 7, the plant 1 comprises a third conveyable module 18, provided with two second hoppers 19, and a fourth conveyable module 21 , provided with a second conveyor and / or weighting belt 22 for aggregates and disposed under said third module 18 when the plant is operating. According to such an embodiment, the third 18 and the fourth 21 module are disposed side by side, respectively, to said first 2 and said second 12 module.

Still according to such a plant embodiment, the second conveyor and / or weighting belt 22 is shiftable between a first position, wherein it is disposed inside said at least a fourth module 21 , at least during the conveying step of said plant, and a second position wherein it is disposed, at least partially, over said first conveyor belt 15 outside said at least a fourth module 21 , at least during said plant 1 operation. In practice, the aggregates coming from the second conveyor and / or weighting belt 22, after their fall from the second hoppers 19 present in the third module 18, are carried towards the first conveyor and / or weighting belt 15 and then loaded on the saddle 100.

It has to be observed that both the fourth module 21 and the second module 12 are provided with corresponding openings 75 and 76 for allowing such a second conveyor belt 22 to reach its second position inside the second module 12.

Figure 8 shows the fourth module 21 wherein said second conveyor and / or weighting belt 22 is accommodated. Such a second conveyor and / or weighting belt 22 is provided with sliding means 78 comprising a couple of linear guides 80 constrained to the two higher horizontal beams 26b (in figure 8 only one of the two beams can be seen) of the fourth module 21. Such a sliding means comprise as well two couples of pulleys 85 sliding along said two couples of guides 80 so that the said second conveyor and / or weighting belt 22 moves between a first and a second position. The two couples of pulleys 85 are provided with idle wheels (herein not shown) adapted for allowing the displacement of the second conveyor belt 22 along the two couples of guides 80. Nevertheless it has to be mentioned that, although herein not described, every possible sliding means 78 may be used for allowing the displacement of the second conveyor and / or weighting belt 22 such as, for example, pad, rail, track, or roller means, or similar, without therefore falling out from the protection scope of the present invention. In conclusion, the sliding possibility of the second conveyor and / or weighting belt 22, when both the third 18 and the fourth 21 module are disposed one over the other, near the first 2 and the second 12 module respectively, allows to highly increase the production capacity of the plant 1. Further, such a solution could be repeated also for other modules, for example a fifth and a sixth module (herein not shown), completely similar to the third 18 and the fourth 21 module, respectively, and themselves placeable next the third 18 and the fourth module 21 , wherein inside the sixth module is present a third conveyor and / or weighting belt (herein not shown) that, in the same way of the second conveyor and / or weighting belt 22, is mobile until being inside the fourth module, at least partially.

It has to be observed that the fourth module 21 , as mentioned, could also be realized independently from the other modules 2, 12 and 18 above described. Therefore, in case of use of the only fourth module 21 , the plant for producing concrete comprises a mobile module 21 for producing concrete wherein it is accommodated a second conveyor and / or weighting belt 22, wherein said second conveyor and / or weighting belt 22 is horizontally shiftable between a first position wherein it is disposed inside said module 21 , at least during the conveying step of said plant, and a second position wherein it is disposed, at least partially, outside said module 21 , at least during the operation of said plant. According to a preferred embodiment, such a plant further comprises an additional module 12 comprising a first conveyor and / or weighting belt 15 so that the second conveyor and / or weighting belt 22 is disposed, at least partially, over said first conveyor and / or weighting belt 15. In this way the second conveyor and / or weighting belt 22 is outside said at least a fourth module 21 , at least during the operation of said plant, that is to say when said second conveyor and / or weighting belt 22 is in its second position. It has to be observed that, in this case, the conveyor and / or weighting belt 22 is inside said second module 12 and the sliding means 78 of the second conveyor and / or weighting belt 22 are the same of those used in the plant wherein the four modules 2, 12, 18 and 21 are comprised. Finally, it has to be mentioned that the first 15 and the second conveyor and / or weighting belt 22 are both tilted, in addition the second conveyor and / or weighting belt 22 reaches the module 12 through the openings 75 and 76, respectively obtained in said fourth 21 and second 12 module.

In addition, as can be seen in figures 5a and 5b, each hopper of said first hoppers 14 comprises three fixed walls 14a integrally anchored to the frame 26, 26a, 26b, whereas there are three U shaped walls 25 joined together to carry the aggregates inside each first hopper 14. In practice, each U shaped wall 25 comprises a couple of separating diaphragms 25b in such a way to obtain a separated compartment, thereby avoiding the aggregates from blending with those poured in a next hopper 14, before their concrete dosing in the second module 12 below. It has however to be mentioned that, in figures 5a and 5b, the U shaped walls 25 are three and the separating diaphragms 25b are four. This because when the three U shaped walls 25 are assembled together in such a way to be integral one to each other, or realized as a whole, each central separating diaphragm 25b activates, or separates one from each other, two adjacent hoppers so that to separate one from each other the aggregates poured in said two adjacent hoppers. In such a way it is anyway guaranteed the aggregate separation and the module structure, provided with more hoppers 14, is simplified. It goes without saying, each hopper 14 could be coupled with only a U shaped wall 25 distinct and separated from that of the adjacent hopper 14, without therefore falling out from the protection scope of the present invention. So in this case, the U shaped walls 25 are independent one from each other and each of the three hoppers 14 could be open or close according to the requirements of the plant 1. Further, the third module 18 too presents second hoppers 19 in the number of two and that are realized in the same way of these afore described for the first module 2. Therefore, the following particular description of the hoppers 14 present is the first module 2 is the same of that for the second hoppers 9 present in the third module 18.

According to the invention, the three U shaped walls 25 coupled together are rotatably anchored to the frame 26, 26a, 26b of said first module 2 and they are able to rotate between a first position, wherein said first module 2 is closed, at least during the module conveying, all the hoppers 14 present in the module being closed, and a second position wherein said three U shape walls 25 are tilted outside said first module 2, at least when said plant is operating, thereby opening all the hoppers 14 present in said module 2. The rotation of said three U shaped walls 25 happens by a plurality of hinges 92 placed on the side of the frame 26 at one 26b of the lower horizontal rods thereof, and by corresponding pins (herein not shown) connected on the lower side of said three U shaped walls 25 joined together. It has to be observed that, according to a different embodiment herein not illustrated, each hopper of said first 14 and second 19 hoppers could be provided with an own U shaped wall 25 without for this reason falling out from the protection scope of the present invention.

Still according to the embodiment herein illustrated, said first module 2 comprises means 30 for limiting the rotation of said three U shaped walls 25. Such means 30 simply consist, in this case, of a higher horizontal beam 26b comprised in the frame 26. In practice, the three U shaped walls rotate until the separating diaphragms 25b come in contact with one of the higher rods 26b of the frame 26 stopping in this position.

It has further to be observed that, according to the invention, the opening and closing mechanism of the hoppers herein shown in figure 5 and 5a may be independently protected from the rest of the plant 1 and / or the other modules 2, 12 and 21. In this case the mobile plant for producing concrete comprises at least one conveyable module 18 wherein it is accommodated at least one hopper 19 wherein , advantageously, each hopper 19 comprises at least one U shaped wall 25 for carrying the aggregates into the plant; said U shaped wall 25 is rotatably anchored to the frame 26 of said module 18 and it is able to rotate between a first position, wherein said at least one hopper 19 is closed, at least during the conveying of said module 18, and a second position wherein said at least one U shaped wall is tilted outside said module 18 at least when said plant is operating. The technical solutions relatively to the U shaped walls 25 joined together, or operating singularly, and about how these walls 25 are constrained to the module 18, are the same of those afore described for the plant 1. For example, if the two U shaped walls 25 are singularly operable, it is possible to have an open hopper 19 and a closed one, or both open, or both closed, according to the requirements. On the contrary in case of the module 18, represented in figure 7, the number of hoppers 19 is two as the number of the U shaped walls, however such U shaped walls 25 are joined together so that the opening and closing of the two hoppers 19 happens at the same time.

Particularly, it has to be mentioned that in case of only one hopper 19 it is present only a U shaped rotatable wall 25, whereas in case of more hoppers 19, for example, in case of two hoppers 19, the U shaped walls 25 may be two and distinct, or two joined one to the other. In such a latter case, the number of separating diaphragms 25b present on the U shaped wall is three because the central diaphragm 25b is used by both the hoppers 19.

It has finally to be observed that what has been discussed relatively to the first module 2, about its conveying capacity by sea and / or land, is valid for the second 12, the third 18 and the fourth 21 module too. In practice, all modules afore described are adapted for being conveyed by sea and / or land, that is to say they have a structure with a parallelepiped shape having internationally standardized dimensions for its conveying by sea and / or land. Such a module can further operate as a bearing structure of the same plant and it is provided with elements such as, for example, isocomer, allowing its raising in every existing deposits or harbor.

Claims

1. Mobile plant (1) for producing concrete, comprising at least a first conveyable module (2) wherein the group for mixing (3) aggregates is accommodated, characterized in that said mixing group (3) is horizontally shiftable between a first position wherein it is disposed inside said at least a first module (2), at least during the conveying step of said plant, and a second position wherein it is cantileverly disposed, at least partially, outside said at least a first module, at least during said plant operation.

2. Plant (1) according to claim 1 , characterized in that said at least a first module (2) comprises at least one horizontal guide (10) provided with at least two C shaped tracks (10a, 10b) along which said at least one mixing group (3) shifts.

3. Plant (1) according to claim 1 or 2, characterized in that said at least a first module (2) comprises at least one rotatable wall (7) for closing / opening said at least a first module (2) and one or more locking elements (8) for holding the wall in a substantially horizontal position, said at least one wall (7) being provided with at least one opening (9) that, when said mixing group is in its second position and said rotatable wall (7) is in the horizontal position, is disposed at an outlet (50) of said mixing group (3) for draining the concrete produced by said mixing group (3).

4. Plant (1) according to one or more of the preceding claims, characterized in that said mixing group (3) comprises at least a first portion of vertical guide (17a) along which at least one saddle (100) slides for conveying said aggregates.

5. Plant (1) according to one or more of the preceding claims, characterized in that said at least a first module (2) comprises as well at least a first hopper (14) disposed near said mixing group.

6. Plant according to one or more preceding claims, characterized by comprising at least a second conveyable module (12) disposed under said first module (2).

7. Plant according to claim 6, characterized in that said at least a second module (12) comprises a first conveyor and / or weighing belt (15) for aggregates coming out from said at least a first hopper (14), towards said at least one saddle (100).

8. Plant (1) according to one or more claims from 6 to 7, characterized in that said at least a second module ( 2) comprises at least a second vertical guide portion (17b), said at least a first vertical guide portion (17a) being coupled to said at least a second vertical guide portion (17b) at least when said mixing group (3) is in its second position.

9. Plant according to one or more of the preceding claims, characterized by comprising at least a third conveyable module (18); provided with at least a second hopper (19), and at least a fourth conveyable module (21), provided with at least a second conveyor and / or weighing belt (22) and disposed under said at least a third module, said at least a third and fourth module being disposed side by side to at least a first and second module.

10. Plant according to claim 9, characterized in that said second conveyor and / or weighing belt (22) for said aggregate is shiftable between a first position wherein it is disposed inside said at least a fourth module (21), at least during the conveying step of said plant, and a second position wherein it is disposed, at least partially, over said first conveyor belt (15), outside said at least a fourth module (21), at least during said plant operation.

11. Plant according to one or more of the preceding claims, characterized in that said at least a first (14) and / or second hopper (19) comprises at least one U shaped wall (25) for carrying the aggregates into said plant, said at least one U shaped wall (25) being rotatably anchored to the frame (26) of said at least a first (2) and / or a third module (18) and being able to rotate between a first position wherein said at least a first (14) and / or second hopper (19) is closed, at least during the conveying of said at least a first and / or third module, and a second position wherein said at least one U shaped wall (25) is tilted outside said at least a first and / or third module, at least when said plant is operating.

12. Plant (1) according to claim 11 , characterized in that said at least a first (2) and / or third (18) module comprises means (30) for limiting the rotation of said at least one U shaped wall (25).

13. Plant (1 ) according to one or more of the preceding claims, characterized in that said at least a first (2) and / or second (12) and / or third (18) and / or fourth (21 ) module comprises a frame (26) having the shape of parallelepiped for conveying by sea and / or by land said at least a first and / or second (12) and / or third (18) and / or fourth (21) module.