EP0007852A1 - Production line for the making of concrete elements - Google Patents

Abstract

Line for the production of concrete elements (unreinforced, reinforced or pre-stressed) comprising means for pouring concrete, a circuit for hardening and means for removing hardened elements. It comprises a chain of floats (A1) suitable for being moved in a liquid tank (E) and means (C, F) for placing the concrete elements (p) which have just been poured, on said floats, which by moving it in the tank, transport the concrete elements through the hardening circuit, means being provided to bring the floats back to the concrete pouring means (B). Application to the manufacture of piles, posts for power lines, slabs, beams, panels, curbs.

Description

The invention relates to a chain for the manufacture of concrete elements (unreinforced, reinforced, or prestressed) such as piles, posts in particular for power lines, slabs, beams, panels, curbs, of the kind which include means for pouring and compacting concrete in molds; a circuit for hardening of the concrete elements which have just been molded, and means for the evacuation of the hardened elements.

We know two main groups of production lines of this kind: one that uses immediate mold release and the other that hardens concrete. in the molds.

The production lines of the first group with immediate demoulding, include, in their hardening circuit, heating installations, with stepped chambers, which require a relatively large energy expenditure to ensure on the one hand, the humidity conditions and desired temperature and on the other hand, the path of the concrete elements between the inlet and the outlet of the hardening circuit.

The production lines belonging to the second group, with hardening of the concrete in the molds, require significant lifting and handling means for moving the molds between the work stations, as well as a relative energy expenditure. vement important for the movement of these molds filled, on part of their path, by the concrete elements.

In addition, for the production lines belonging to the two groups, there is a significant percentage of rejects, due, in particular, to hardening incidents, and, in general, the quality of the finished products is average. In addition, the diversification of the production of such production lines is difficult to achieve.

The object of the invention is, above all, to provide a chain for manufacturing concrete elements which better meets the various requirements of practice than hitherto and in particular such that it no longer has or to a lesser degree the disadvantages recalled above and which makes it possible to produce a wide range of concrete elements, even of large size, by better satisfying the various requirements of cost price, productivity and quality.

According to the invention, a chain for the manufacture of concrete elements of the kind defined above is characterized in that it comprises a chain of floats capable of being moved in a liquid tank (in particular water or oil) and means for placing the concrete elements which have just been poured, on said floats, which floats, moving in the tank, transport the concrete elements from the pouring means to the evacuation means by passing the concrete elements through the hardening circuit, means being provided for bringing the floats back to the concrete pouring means.

According to a first possibility, the liquid tank is arranged so that the circuit followed by the floats in this tank is an open circuit between the concrete pouring means and the discharge means, and the means for bringing back the floats the pouring means consist of handling means such as in particular overhead cranes, cranes or hoists.

According to another possibility, the liquid tank is arranged so that the circuit followed by the floats is a looped circuit, passing through the pouring means and the evacuation means, the means for bringing the floats back to the casting means being constituted by part of the tank itself.

The circuit can be looped in a horizontal plane, the tank then having two adjacent compartments in which the floats move in opposite directions.

The circuit can be looped in a vertical plane, the tank having a single compartment and the paths, in opposite directions, made by the floats between the pouring means and the discharge means or vice versa, being superimposed.

The displacement of the floats in the tank can be carried out, in particular by floating, so that the elements remain above the level of the liquid, the hardening circuit being constituted by at least a part of the tank, in particular equipped with means heaters suitable for accelerated hardening.

According to a variant, the floats, for at least part of their displacement corresponding to the crossing of the hardening circuit, are immersed with the concrete elements which they support, in the liquid of the tank; this liquid is gradually heated along the tank.

Advantageously, the floats have a volume determined according to their weight and the weight of the concrete elements to be transported, the heaviest and the lightest, so that during the flotation or the immersion of the floats in the liquid of the tank , the gravitational force due to the heaviest products is equal to the ascending force obtained with the lightest products.

When the concrete pouring and compacting means are arranged to ensure the molds are released from the mold elements immediately after being poured, the floats are formed by "float boards" on which the bare elements are deposited during immediate demoulding.

When the concrete elements remain in the molds during hardening, the floats are formed by "mold-bearing floats" on which the molds are fixed, and these "mold-bearing floats" move in a looped circuit so as to make pass the molds not only through the hardening circuit, but also through the various work stations (pouring concrete, demolding, cleaning the molds).

The floatability of the floats can be modified, as required, either using a weight, or by modifying their balance by introducing inside, or evacuating from, the floats of a liquid, in particular the tank liquid.

The liquid tank can be buried, semi-buried or overhead; it is constructed so as to ensure on the one hand a good seal and, on the other hand, an effective thermal insulation when heating means are used for the accelerated hardening of the concrete.

Thanks to the float chain, the movement. concrete elements through the curing circuit is carried out with minimum energy consumption; the closed enclosure constituted by the liquid tank makes it possible to minimize the losses of thermal energy in the case of an accelerated hardening circuit with heating means inside the tank.

Other advantages of the invention will appear better with the aid of the detailed description given below with reference to the attached drawings, but which is in no way limiting.

Figure 1 of these drawings is a schematic longitudinal section of a chain for the manufacture of concrete elements, with immediate demoulding using a 180 ° tilting device, in which the movement of the floats is ensured by floating throughout the liquid tank, according to the invention.

FIG. 2 shows, on a larger scale, the means for pouring concrete and demolding the production line of FIG. 1.

FIG. 3 is a schematic longitudinal section of a production line, with immediate demoulding using a 90 ° tilting device, in which the movement of the floats is first carried out by floating during the period of recovery of the concrete, and then by immersion in the liquid of the tank.

Figure 4 shows, on a larger scale the means for pouring concrete and demolding the chain of Figure 2, suitable for the manufacture of electrical poles.

FIG. 5 is a schematic longitudinal section of an immediate demoulding production line, in which the unreinforced concrete elements are placed directly on the floats, the latter describing, in the tank, a closed loop circuit in the vertical plane with floating in the forward direction and immersion in the liquid for the return.

Figure 6 is a cross section along I-I, fig. 5.

Figure 7 is a plan view with parts broken away _s of a production line wherein the curing of concrete elements takes place in molds, moving the floats being effected along a looped circuit in a horizontal plane, the liquid tank having two adjacent compartments, the movement being carried out by floating in a first compartment of the tank and by immersion in the liquid for the adjacent compartment.

Figure 8 is a cross section along I-I, fig. 7.

Figure 9 is a cross section illustrating the assembly of the production line of Figures 7 and 8 in a floating hull of a boat.

FIG. 10 is a perspective view, with the cut part, of a "float board" formed by an envelope filled with a material, in particular hydrophobic.

Figure 11 shows, similarly to Figure 10, a "float board" produced mainly using hollow profiles.

Figure 12 shows, similarly to Figure 10, a "float board" made mainly using a tube.

Figure 13, finally, is a cross section of a carrier-mold float produced using several tubes.

Referring to the drawings, we can see several types of production lines for a wide range of elements or products "p" in concrete, unreinforced, reinforced or prestressed.

Each élémentsen manufacturing chain concrete comprises: means B of casting and compacting of concrete in molds or mold batteriesde _s Dl, D2, D4; a circuit H for the hardening of the concrete elements which have just been molded and means K for the evacuation of the hardened elements.

According to the invention, the production line comprises a chain of floats formed either by Al float boards (fig. 1 to 6 and 10 to 12) or by A2 mold support floats (fig. 7 to 9 and 13) suitable for being moved into a liquid tank E, generally a water tank or possibly an oil tank; this tank E may or may not be equipped with heating means R for accelerated hardening.

Means C, F, are provided for placing the concrete elements p, which have just been poured onto said floats A1, A2; these floats moving in the tank E transport the concrete elements pfrom the pouring means B to the evacuation means K by passing the concrete elements through the hardening circuit H. The floats move head to head and / or side by side.

Means, formed by handling means G (fig. 1,3) or by the tank E itself (fig. 5 to 8) are provided to bring the floats Al, A2, to the concrete pouring means B.

The liquid tank E is arranged according to the embodiments of FIGS. 1 and 3, so that the circuit followed by the floats Al in this tank is an open circuit comprised between the pouring means B and the discharge means K ; the means for bringing the floats Al back to the casting means B are constituted by handling means G such as overhead traveling cranes (fig. 1), cranes (fig. 3) or hoists.

According to the embodiment of Figures 7 and 8, the liquid tank is arranged so that the circuit followed by the floats Al, A2, is a looped or closed circuit passing through the pouring means B and the discharge means K , the means for bringing the floats back to the pouring means being constituted by a part of the tank E itself.

In the case of FIG. 5, the circuit is looped in a vertical plane; tank E has a single compartment and the paths taken by the floats in opposite directions are superimposed.

According to the embodiment of FIGS. 7 and 8, the circuit is looped in a horizontal plane and the tank E has two adjacent compartments as clearly visible in FIG. 8.

In the case of immediate demoulding of the concrete elements p, just after the concrete has been poured, the floats are constituted by "float boards" A1 (fig. 1 to 6 and 10 to 12). These float boards can be arranged in the form of an envelope 1 (made of sheet metal, polyester, etc.) having the shape of a parallelepiped,. Envelope made waterproof by welding, or in particular by the injection of a hydrophobic material and slight 2 (fig. 10); according to a variant, these "float boards" A1 are produced using one or more floating elements (FIGS. 11 and 12) such as tubes, conduits, hollow profiles, etc. linked to a plate 4 for supporting the products or elements, by assembly parts 5. The "float boards" A1 are provided on their side with guide parts 6 (grooves, rollers, etc.) suitable for cooperating with rails 42 s' extending in the longitudinal direction of movement of the floats, on the walls of the tank E; buffer parts 7 are provided at the ends of the boards A1 transverse to the direction of movement.

In certain cases, the two alternative embodiments illustrated in particular by FIGS. 10 and 11 can be combined.

In the event that the concrete elements p remain in the molds, during hardening, the floats are formed by mold support floats A2 (FIGS. 7 to 9 and 13); they comprise floating elements 3 and parts similar to those described above and designated by the same references. digital 2, 5, 6 and 7; the floats A2 further comprise one or more platforms 8 for longitudinal or transverse work; if necessary, rollers 9 for rolling (fig. 8 and 9) can be provided below the floats A2. These floats are provided with mold supports 10 mounted on the frame of the float by means of support pieces 11, in particular of elastic studs so that it is possible to vibrate the support 10 for compacting the concrete contained in molds, by filtering vibrations towards the float frame. Advantageously, the vibration means V (FIG. 13) schematically represented are arranged to be hooked, during the vibration, to the mold support 10; these vibration means V occupy a fixed position in the tank E while the floats A2 and therefore the supports 10 move in the longitudinal direction; receiving parts 13 (fig. 13) for example formed by U-shaped profiles are provided under the supports 10; during the step-by-step advance of a float A2, the vibration means V are detached from the support 10 and rest by rotating rollers on the parts 13; we understand that during the advance of a step equal to the length of a float A2, the vibration means V, kept fixed in the longitudinal direction of the tank E, in particular by a cable attached to one end of the tank, pass below the immediately following float.

Advantageously, the volume of the floats A1, A2 is calculated, as a function of their weight and of the weight of the heaviest and lightest products to be manufactured, so as to ensure, during the immersion of the floats provided with the bare products, a force gravitational, obtained when the float is loaded with the heaviest products, whose amplitude is equal to that of the ascending force obtained when the float is loaded with the lightest products; this ensures economical routing of the floats in the hardening circuit.

In other words, in the case of the heaviest products, Archimedes' thrust only partially compensates for the weight of the heaviest product and it undergoes a gravitational force oriented downwards; in the case of the lightest products, the buoyancy is greater than the weight of the product and this results in an ascending force.

The guide rails or slides 42 of the floats are thus subjected to reduced forces, in particular in the parts of the tank where the floats are completely submerged. Means, such as, for example, remote-controlled solenoid valves N, can be provided on the floats to modify the balance of these floats by introducing, inside the floats, a liquid, in particular the liquid of the tank ; these means also make it possible to evacuate the liquid from the floats, for example by admitting compressed gas into the float, in order to expel the liquid.

The means B for pouring and compacting the concrete (FIGS. 1 to 4) are conventional and include a distribution hopper, in particular provided with a drum 15 for adjusting the flow rate, with a finishing rule.

The demolding means and the means for placing the concrete elements p on the floats may include tilting means C arranged either to ensure a 180 ° tilting (fia. 1 and 2) or a 90 ° tilting (fia. 3 and 4).

In the case of tilting 180 °, the tilting means comprise a frame C1 suitable for tilting 180 ° around an axis β (fig. 1 and 2). The frame C1 is provided with parts 17, in particular elastic, for supporting and fixing the molds Dl. Movens, such as a jack, are provided for controlling the tilting of the frame Cl around the axis β. A device is, moreover, provided for clamping the "float boards" Al against the molds D1; this device comprises bent lever arms 18, articulated at 18a and provided with two lunctitudinal contact pieces 19 suitable for pressing the boards Al against the molds; the lever arms 18 are linked to a system of tilting cylinders 20 articulated on uprights 21 fixed on the frame C1; the joints 18a are also provided on the uprights 21.

In the case of a 90 ° tilting, the tilting means comprise a frame C2 (fig. 3 and 4) used in particular for the manufacture of elements of great length with cross section in the shape of a U or T. This frame C2 comprises a frame 22, capable of rotating about an axis of rotation 23; two jacks 24 are provided to control the tilting of the frame C2. A device is also provided for clamping the "float boards" Al against the molds and for lowering these boards; this clamping and lowering device comprises a longitudinal support 25, guides 26 for the movements of this support 25, and two jacks 27 controlling these movements. For casting, the "float board" Al is clamped in the frame, so as to form a part of the mold, as visible in FIG. 4. After tilting the frame C2 at 90 ° relative to the position of the figure 4, we operate the loosening with the jacks 27, which causes a vertical downward movement of the support 25 and the "float board" Al in the tank E; at the same time, the immediate release took place, and the concrete elements p are supported by the board Al.

The molds or mold batteries Dl (FIGS. 1 and 2) comprise one or more shells 28, made of sheet metal, an assembly frame 29, provided with plates 30 for attaching the vibrators 31 and wedges 32 for bearing on the pads 17.

In the case of tilting at 90 ° (fig. 3 and 4) the mold D2 is constituted by a bottom 33, a wall 34 and the "float board" Al itself, placed parallel to the wall 34; in some cases, removable shells 35 are fixed on the wall 34 and / or on the "float board" A1.

The tilting frame Cl, C2 equipped with the molds and the device for distributing and smoothing the concrete are mounted on a common metal framework 36, with all the hydraulic and electrical connections so as to form an independent module or "pouring-demolding head" , which can be transported and mounted. in a very short time.

In the case of production lines where the. hardening of the concrete elements takes place in the oules D4 (figs. 7 to 9 and 13), these molds are constituted in a conventional manner, independent or in batteries.

The water tank E (fig. 1 to 9) is arranged to ensure sealing and good thermal insulation. The heating means R of this tank, for the hardening circuit, differ according to the type of production lines.

For the type of production line in which the floats, supporting the concrete products, move by floating, so that the concrete products always remain above the liquid level, the volume of the tank located above the liquid using conventional means such as steam, or proceed by spraying hot water.

For the production lines in which the concrete elements are immersed in the tank liquid, during the passage of the hardening circuit H (fig. 3 to 8), heating means R of the tank liquid are provided, so as to ensure an increasing temperature of this liquid along the tank; these heating means can include a superheated water distribution installation provided with fittings, arranged along the tank, and provided with flow-adjusting solenoid valves, as a function of the desired temperature, in order to obtain the optimum curve for temperature. However, the heating of the liquid in the tank can be ensured by other means such as steam, electrical resistances or any other suitable heating means. In some cases, hot water from natural sources or industrial recovery can be used. By using for the recovery of cooled water a network parallel to that of supply and placed in the same channel, one obtains an increased economic efficiency.

Means F (fig. 1, 2 and 3) are provided to ensure the descent, immersion and exit of the float boards Al, provided with bare products. These means F comprise either mechanical elevators or float elevators 37, fitted with a sliding mechanism 38, guide pieces 39 for the float boards and two connectors, one 40 for filling the float elevator 37 with liquid and the other 41 for the evacuation of the liquid out of the float lift 37. The filling of this float lift 37 with liquid causes it to descend into the tank E, while the evacuation of the liquid from this lift, causes it to rise in the liquid of the tank.

The means of displacement of the floats Al or A2 consist of pushing devices 43, in particular formed by synchronized jacks, ensuring a step-by-step advance of all the floats in abutment against each other. The floats are guided by the rails or slides 42 (see in particular fig. 2).

For the production lines in which the concrete elements are immersed in the liquid, floats are used for the longitudinal and transverse displacements of conventional displacement means such as pushing devices with jacks described above; for the vertical displacements of the floats intended to cause the immersion of these floats or their rise to the surface of the liquid, valves are used as explained previously to introduce or expel liquid from the floats.

The means K (fig. 1 to 9) for evacuating the concrete elements from the chain can be confused, in certain cases (fig. 1 and 3) with the means G for returning the "floatboards" Al to the pouring means. These conventional means K (overhead traveling cranes, cranes, electro-hoists, etc.) are in particular fitted with suction cups 44 (fig. 3,5) or electromagnet 45 (fig. 8, 9) devices for handling steel reinforcements.

The production lines of the invention can be fixed or can be mounted in a hull 46 (fig. 9) of a boat in order to constitute a floating factory; this shell 46 is then equipped with a concrete buffer hopper, reinforcement workshops 47 for depositing materials 48 and other annexes.

In all cases, the curing can be natural, or accelerated by means of heating.

It will be noted that the means B for pouring the concrete, in the case of the production line in FIG. 5, are arranged to allow immediate release from the mold by placing the concrete elements directly on the floats A1.

The production lines in accordance with the invention make it possible to produce good quality products, even if they are large, with reduced energy consumption. Indeed, the floats on which the concrete elements are placed during their hardening, are supported, by the liquid of the tank, over their entire surface; the deformations of the floats due to the load formed by the concrete elements are reduced during hardening, which thus takes place in good conditions. This remains true, even if they are elements of large dimensions such as electric poles. whose length can reach ten meters or more.

The thermal losses are reduced because the tank E can be thermally insulated in good condition, this tank communicating with the outside only at one or at its two ends, according to relatively small openings.

Claims (21)

1. Chain for the manufacture of concrete elements (unreinforced, reinforced, or prestressed) such as piles, posts, in particular for power lines, slabs, beams, panels, curbs, comprising means for pouring and compacting concrete in molds; a circuit for hardening the concrete elements which have just been molded, and means for the evacuation of the hardened elements, characterized in that it comprises a chain of floats (Al, A2) suitable for being moved in a tank (E) for liquid (in particular water or oil) and means (CF) for placing the concrete elements (p), which have just been poured, on said floats, which floats, by moving in the tank (E ), transport the concrete elements from the pouring means to the evacuation means (K) by passing the concrete elements through the hardening circuit, means (G, E) being provided to bring back the floats (Al, A2) to the concrete pouring means (B). 2. Manufacturing line according to claim 1, characterized in that the liquid tank (E) is arranged so that the circuit followed by the floats (Al, A2) in this tank is an open circuit between the means pouring (B) of the concrete and the means of evacuation. (K) and that the means for bringing the floats back to the casting means are constituted by handling means (G) such as in particular an overhead crane, crane or hoist. 3. Manufacturing line according to claim 1, characterized in that the liquid tank (E) is arranged so that the circuit followed by the floats is a looped circuit, passing through the pouring means and the evacuation means , the means for bringing the floats back to the pouring means being constituted by a part of the tank (E) itself. 4. Manufacturing line according to claim 3, characterized in that the liquid tank (E) is arranged to form a looped circuit in a horizontal plane, the tank having two adjacent compartments in which the floats move in opposite directions. 5. Manufacturing line according to claim 3, characterized in that the liquid tank (E) is arranged so as to form a looped circuit in vertical plane, this tank having a single compartment, the paths, in opposite directions, made by the floats between the pouring means and the discharge means or vice versa, being superimposed. 6. Manufacturing line according to any one of the preceding claims, characterized in that the movement of the floats (Al, A2) in the tank (E) takes place so
such that the elements (p) remain above the level of the liquid and that the hardening circuit consists of at least part of the tank, in particular equipped with suitable heating means. 7. Manufacturing line according to any one of claims 1 to 6, characterized in that the floats (Al, A2); for at least part of their displacement, corresponding to the passage of the hardening circuit, are immersed with the concrete elements (p) which they support, in the liquid of the tank, this liquid being in particular progressively heated, along tank. 8. Manufacturing line according to claim 7, characterized in that it comprises means for heating the liquid of the tank formed by a superheated water network provided with fittings with automatic adjustment of the flow rate as a function of the desired temperature in the respective zone and that it includes a return network of water cooled at the source, the two networks being in particular placed in the same gutter. 9. Manufacturing line according to any one of the preceding claims, characterized in that the floats (Al, A2) have a volume determined in. according to their weight and the weight of the concrete elements to transport, the heaviest and the lightest, so that during the flotation or the immersion of the floats in the liquid of the tank, the gravitational force due to the heaviest products is equal to the ascending force obtained with the products lighter. 10. Manufacturing line according to claim 9, characterized in that the floats comprise means capable of modifying their balance, by introducing inside, or evacuating from, the floats of a liquid, in particular the liquid of the tank. 11. Production line according to any one of the preceding claims, characterized in that the means for pouring and compacting the concrete are arranged to release the elements from the mold, immediately after their pouring, and that the floats are formed by "float boards" (Al) on which the bare elements are deposited during immediate demoulding. 12. Manufacturing line according to claim 11, characterized in that the casting means are arranged so as to ensure the closing of the molds by the "float boards" (Al) and that they include tilting means (C ) molds for demolding so that after tilting, the "float boards" (Al) are located below the molded elements, so as to support them, means being further provided for lowering the boards- floats in the water tank (E). 13. Manufacturing line according to claim 12 characterized in that the tilting means comprise a tilting frame (Cl) arranged to tilt at 180 ° and comprising a frame for fixing the molds or mold batteries on elastic pads (17), a clamping device (18, 19, 20 and 21) of the "float boards" (Al) on the molds after pouring concrete into the molds and means for tilting the assembly at 180 °, so that the "float boards" (Al) support the bare elements after demolding. 14. Manufacturing line according to claim ₁₂ , characterized in that the tilting means comprise a tilting frame (C2) arranged to tilt at 90 °, this frame comprising a frame (22) provided with axis of rotation (23) , the tilting at 90 ° being controlled by jacks (24), and that a device for clamping and lowering the "float boards" (Al) is provided, this clamping device comprising in particular a longitudinal support (25), guides (26) and two synchronized cylinders (27), the assembly being such that during the pouring of the concrete, the "float board" (Al), possibly provided with conuilles (35) is clamped on the frame by forming a part of the mold, and that after the tilting at 90 °, by the loosening operation carried out vertically, the mold is removed and the lowering of the "float board _" (Al) supporting products molded in the water tank. 15. Manufacturing line according to claim 14, in particular for the manufacture of elements with a cross section in "I" or "T", characterized in that the mold is constituted by a bottom (33), by a vertical wall (34) and by the "float board" (Al), itself disposed parallel to said vertical wall and clamped on the bottom, removable shells (35) which can in particular be fixed on the wall and / or on the " float board ". 16. Manufacturing line according to any one of claims 11 to 15, characterized in that each "float board" (Al) is formed in the form of an envelope (1) made watertight, in particular by injection of a hydrophobic and light material (2) and / or using one or more floating elements (3), linked to a plate (4) supporting bare products, said boards being provided with guide pieces ( 6) of buffers (7) and possibly of rollers. 17. Manufacturing line according to any one of claims 1 to 10, wherein the elements-in concrete remains in the molds during hardening, characterized in that the floats are formed by mold carrier floats (A2), on which the molds are fixed, and that these mold carrier floats move in a looped manner that the molds pass not only through the hardening circuit, but also through the various work stations (pouring concrete, demolding, cleaning the molds). 18. Manufacturing line according to claim 17, characterized in that each carrier-mold float (A2) comprises on the one hand floating elements (3) and assembly, guide and contact parts, and d on the other hand, at least one working platform (8) and mold supports (10) provided with support and fixing parts, and, optionally, receiving parts (13) for vibration means (V) . 19. Manufacturing line according to claim 18, characterized in that each carrier float; n or (A2) comprises receiving parts (13), in particular formed by U-shaped profiles, provided under the support (10), for the vibration means (V) and that these vibration means (V) are arranged to be hooked, during the vibration, to the mold support (10), these vibration means occupying a fixed position in the tank (E) then that the floats (A2) move in the longitudinal direction, the aforementioned vibration means (V) being detached from the support (10) and resting, in particular by rotary rollers, on the receiving parts (13) during the advance step-by-step of a float (A2). 20. Manufacturing line according to any one of the preceding claims, characterized in that it comprises means (F) for lowering, immersion and outlet of the floats, these means comprising elevators, in particular lift-floats fitted with fittings, one for filling the float lift with liquid and the other for the evacuation of the liquid so as to cause the descent or the rise of the lift-float. 21. Manufacturing line according to any one of the preceding claims, characterized in that it is mounted in a hull (46) of a boat so as to constitute a floating factory.

Images