WO2010136693A1

WO2010136693A1 - System for recovering and pulling a submerged object, in particular a naval mine

Info

Publication number: WO2010136693A1
Application number: PCT/FR2010/050889
Authority: WO
Inventors: Alain Desmoulins; Patrick Fosse; Jean-Luc Pardos
Original assignee: Service Industrie Marine
Priority date: 2009-05-26
Filing date: 2010-05-07
Publication date: 2010-12-02
Also published as: EP2435295B1; FR2946007A1; EP2435295A1

Abstract

The invention relates to a system for recovering and pulling a submerged object (32), capable of being used on a vehicle, in particular a craft (30), and including: an inflation line (1) capable of conveying a gas from a gas source to at least one inflatable unit (31) for raising the object; downstream fastening means (2a, 7a, 7b) for the direct or indirect mechanical fastening of said inflation line (1) to the inflatable unit (31) for raising the object; and upstream fastening means (2b) for the direct or indirect mechanical fastening of the inflation line (1) to an anchoring point on the vehicle (30). The downstream fastening means (2a, 7a, 7b) and the upstream fastening means (2b) are provided on a cable (2") that is part of a pulling line (2) parallel to the inflation line and rigidly connected thereto. The invention also relates to a method for implementing same.

Description

System for the recovery and traction of an immersed object, in particular an aquatic mine

The present invention relates to a system for recovering an immersed object and more specifically to a system for remote inflation and towing of an immersed object lifting structure and its use, preferably on board a boat, for the lifting and towing of an immersed object, for example an aquatic mine or a torpedo.

There are several known methods for recovering an object immersed in an aquatic environment, for example in the sea, a lake, a river, a river or any other body of water.

A first known method consists in securing the object with a towing cable or the like and removing it from the water by pulling the cable from the bank and using a vehicle, such as a truck, tow truck or the like. This method is used to remove vehicles from waterways. However, it is understood that this method quickly finds its limits when the object exceeds a certain weight, when its immersion exceeds a certain depth or when the object is immersed too far from the edge and / or in a place only accessible by boat.

A second known method, in particular described in US-A-5689086, is to use a boat to tow the object. This method overcomes some of the disadvantages above but is not ideal because the boat may encounter difficulties during towing, especially when the object is partially buried in the mud, is caught between rocks making his traction difficult or when the seabed is very irregular. In addition, this method is not or difficult to use, when the object is fragile or has a risk of explosion, for example when the object to be recovered is a submarine aquatic mine.

A third known method consists in using one or more inflatable object lifting structures, for example submarine bags or parachutes, which are immersed, secured to the object to be picked up by one or several on-site divers, and then inflated. by them with air or another gas. Once inflated, under the effect of buoyancy, the structures or structures filled with gas will cause the object to the surface where it can be recovered on board a boat or the like. This method, however, also has disadvantages. First, to be able to recover the object, the boat must be able to approach the site where the inflatable structures connected to the object have surfaced.

However, this is not always possible because the seabed is not necessarily sufficient. Moreover, when the object is caught in the mud, the buoyancy of Archimedes is not always enough to remove it. In addition, when the object to be recovered presents risks of explosion, such as an aquatic mine or a torpedo, for example, recovering this floating object on the surface can be complicated and dangerous. Moreover, with this type of object, the inflating itself of the inflatable structure or structures that are connected to the object, may present risks, especially for the plunger or divers who usually intervene on site to connect the object to the inflatable device.

Other methods and devices for lifting submerged objects by means of inflatable submarine balloons or parachutes are further described by US-A-1531433, US-A-4498408, US-A-5516235 and A-4078509. The problem to be solved is therefore to propose an improved system for recovering an immersed object, in particular an object presenting risks of explosion or bodily injury for the divers (s) likely to be present on the site, in particularly useful for the recovery of aquatic mines, torpedoes or the like.

The solution of the invention is a system for recovering and pulling an immersed object, such as a mine, suitable for use on a vehicle, in particular a boat, comprising:

an inflation line capable of conveying a gas from at least one gas source to at least one inflatable object lifting unit, said inflation line comprising an upstream end intended to be connected fluidically to said at least one source of gas and a downstream end intended to be connected fluidly to said at least one inflatable object lifting unit so as to supply said at least one inflatable gas lifting unit delivered by said at least one gas source and conveyed by said inflation line,

downstream securing means allowing direct or indirect mechanical attachment of said inflation line to said at least one inflatable object lifting unit supplied with gas by the inflation line, and

upstream securing means allowing direct or indirect mechanical stowage of said inflation line to an anchor point present on the vehicle, characterized in that: the downstream stowage means and the stowage means upstream are located at the downstream and upstream ends, respectively, of a traction line, the traction line comprising a cable, and

the inflation line and the traction line comprise a first tube and a second tube, hollow and flexible, which are secured to one another, the first tube serving to conveying gas and the second tube comprising the cable disposed within said second tube and slidable inside said second tube.

Depending on the case, the system of the invention may comprise one or more of the following features: the downstream securement means and the upstream securement means are fixedly secured to the inflation line.

- The traction line arranged in parallel with the inflation line and is integral therewith.

the downstream stowage means and the upstream stowage means are situated at the downstream and upstream ends, respectively, of a traction line comprising at least one cable, for example a steel cable. In other words, the downstream stowage means and the upstream stowage means are carried by at least one cable (or several cables connected to one another) forming part of a traction line arranged in parallel with the inflation line and secured to it.

the traction line comprises a cable inserted into a protective protective sheath.

the second tube forms a sliding protective sheath around the cable.

the inflating line and the pulling line comprise a first and a second tube, hollow and flexible, which are arranged in parallel with each other and secured to one another by forming a single structure having a section shaped "8". - The upstream end and the downstream end of the inflation line each comprise a connector adapted to and designed to allow the fluid connection of said inflation line, preferably connectors are of type closure coupling.

- The inflation line is at least partially wound on a dispensing device, preferably a drum. the inflation line is formed of several sections connected to each other, preferably each section comprises a portion of the inflation line, and downstream stowage means and upstream stowage means, the downstream stowage means to mechanically connect the sections together or to an inflatable lifting unit and the upstream securing means for mechanically connecting the sections together and at an anchor point of the vehicle, in particular a boat.

the upstream end of the inflation line is connected fluidically to at least one gas source via an upstream connecting device comprising a gas circuit equipped with at least one gas expansion device, preferably the gas circuit comprises two input branches each connected to a gas source and each equipped with a gas expansion device, and an output branch fluidly connected to the two input branches and the upstream end of the inflation line.

the downstream end of the inflation line is fluidly connected to an object lifting unit via a downstream connecting device comprising a gas circuit equipped with a non-return valve means.

The invention also relates to a recovery assembly of a submerged object comprising a boat comprising at least one pressurized gas source, and at least one inflatable submerged object lifting unit, characterized in that it also comprises a recovery system according to the invention, said recovery system being: - fluidly connected to said at least one source of gas under pressure and to said at least one inflatable lifting unit, via the inflation line, so as to supply said an inflatable lifting unit made of pressurized gas delivered by said at least one gas source, and

- mechanically connected to said inflatable lifting unit and at least one docking point carried by said boat. Furthermore, the invention also relates to a method for recovering an object immersed in an aquatic environment, in particular the immersed object to be recovered is an aquatic mine immersed at sea, in which a) a set of recovery is implemented according to the invention, b) the inflatable lifting unit is secured to the immersed object to be recovered; and c) the at least one pressurized gas source is fluidically connected to the inflatable lifting unit via the inflation line, d) mechanically connects the inflatable lifting unit to at least one docking point carried by the boat with the aid of the downstream stowage means and the upstream stowage means, e) one operates at least partially inflating the inflatable lifting unit with pressurized gas delivered by at least one gas source located on the boat and conveyed by the inflation line, f) and if necessary, a mechanical traction of the inflatable unit e lifting in the direction of the boat, through the downstream docking means and the upstream docking means.

In other words, the solution of the invention is therefore based on an inflation and remote towing system of an inflatable lifting structure of an immersed object and its use on board a vehicle, preferably on board a boat, such as a surface vessel, a boat, a barge or the like, for the lifting and towing of various submerged objects, including aquatic mines, torpedoes or the like. Usually, during the recovery of an underwater mine, the divers are faced with handling difficulties and risks of explosion, in particular during the inflation of the lifting structure or during its towing.

Now, thanks to the system of the invention, the risks for the divers or divers are ruled out because:

- On the one hand, the inflation of the inflatable structure connected to the mine or the like is remote, so does not require the presence of divers nearby and therefore, even in the event of an unexpected explosion of the mine, nobody is hurt, and

- On the other hand, once raised, the mine can be remotely towed by a boat for example, and down to land for example where it can then be defused, without risk of exploding in contact with the hull. the boat and without risk for divers likely to be nearby.

The system of the invention can be used up to depths of up to about 80 meters in an underwater and / or hostile environment. The invention will now be described in more detail with the aid of the appended figures given for illustrative and non-limiting purposes, among which:

FIG. 1 schematizes an operation for recovering an aquatic mine with a system according to the invention,

FIGS. 2A and 2B schematize two embodiments of an immersed object recovery system according to the invention,

FIG. 3 schematizes an inflation line of a system according to the present invention and the upstream and downstream lyres,

FIG. 4 shows a method of storage on a rotating drum of an inflation line of a system according to the present invention; FIG. 5 shows an embodiment of the upstream lyre,

FIG. 6 shows a damping device that can be inserted between the system of the invention and a boat,

FIG. 7 shows two embodiments of the downstream lyre, and

Figure 8 shows the structure of the inflation and traction lines of Figure 2A. Conventionally, when an object 32 to be recovered, such as an aquatic mine, is located, one or more divers are sent to the site where they have a sort of net or the like around the immersed object 32. Next, the net or the like is secured to an inflatable object lifting unit 31, such as a balloon, an aquatic parachute or the like, which is, sometimes but not always, slightly pre-inflated by the plunger (s) by means of a self-contained gas reserve; they take with them. However, this pre-inflation, even when it takes place, is not enough and actual inflation of the lifting unit and especially its extraction from the site where the object is located must take place later. To do this, a system according to the invention is used.

More precisely, as illustrated in FIG. 1, an object recovery system according to the present invention intended to be implemented preferentially on a boat, comprises one (or more) section 100 and, for example, 200 meters long, comprising, on the one hand, an inflation line 1 for conveying a pressurized gas from the boat 30, that is to say a boat, a barge, a surface vessel of the navy or the like, on which the The system according to the present invention is installed up to the inflatable object lifting unit 31, such as a balloon, an aquatic parachute or the like which is secured to the object to be recovered, and secondly, means or a traction line 2, such as a steel cable for example, for pulling the inflatable lifting unit 31 connected to the immersed object 32, after possibly extracted said object from the vase or the like.

As shown in Figure 4, the system according to the present invention is stored by being preferably wound or wound (at 7) on a dispensing device 5, namely here a rotating drum.

FIGS. 2A and 2B schematize two embodiments of an immersed object recovery system according to the invention comprising an inflation line 1 which is in fact a flexible conduit or the like for conveying gas of sufficient strength to not break during use, securing means 2a, 2b and connectors l ia, 11b located at the downstream ends 1a and upstream 1 Ib, respectively, of said line 1 of inflation.

The downstream securement means 2a and the upstream securement means 2b may be:

- are attached independently of each other, directly or indirectly, to the inflation line 1 of each section, as shown in Figure 2B. However, in this case, since the inflation line 1 acts as both gas conveying line and traction line, it must be carried out with sufficiently resistant materials to withstand traction without breaking .

either be dependent on each other, for example be arranged at the levels of the upstream ends Ib and downstream of the same traction line 2, in particular at the two ends of a towing cable or the like, as shown in Figure 2A. This embodiment is preferred because it dissociates the functions of conveying and gas supply, and traction. Indeed, in this case, the inflation line 1 serves only to convey the gas to the re-lifting unit, while the traction line 2, comprising a 2 "steel cable for example, makes mechanical link office used to pull the lifting unit. The detail of a preferred structure of this type is given in FIG. 8. More precisely, FIG. 8 is a diagram of a preferred embodiment according to the invention of the structure of the inflation lines 1 and the traction lines 2. as can be seen, the inflation line 1 and the traction line 2 comprise a first 1 'and a second 2' hollow and flexible tube, which are secured to one another in a single structure (section) in the form of "8" in this case. The first tube 1 'forming the inflation line 1 serves to convey the air (direction of the arrows) which is used to fill the inflatable lifting unit, while the second tube 2' comprises a cable 2 "capable of sliding at the inside of said second tube 2 'so as to be able to absorb variations in the traction force applied to said cable 2 ", especially when the boat is moving because of a rough sea for example.

The cable 2 "is provided, as illustrated in FIG. 2A, with downstream securement means 2a and upstream 2b for hanging the structure (section) formed by the inflation lines 1 and the traction lines 2 either at the boat and at the unit directly or indirectly (via the lyres, for example), or to fix several structures or sections between them Advantageously, to prevent a rupture of the inflation line 1 in case of rough sea or the like, it is expected that the cable 2 equipped with its downstream securing means 2a and upstream 2b has a length less than the length of the inflation line 1, preferably a length difference of several meters, for example from 2 to 6 meters, so that it is always the cable 2 "which is stretched and subjected to traction and not the inflation line 1 which is more fragile so likely to break more easily.

In order to minimize the risk of rupture of the cable 2 "itself, it is possible to provide a damping device 34 able to be inserted between the cable 2" of the system of the invention and the boat, as for example that illustrated in FIG. This damping device 34 absorbs the shocks that may occur on the cable 2 ", in particular in rough seas, for example, the downstream securing means 2a and upstream 2b may comprise loops 12a, 12b of attachment, for example of type carabiner or the like, either fixed independently of the outer wall of the line 1 (Fig IB), or located at the ends of a common connecting cable 2 forming a traction line 2 (Fig. IA).

These securing means 2a, 2b serve to connect the inflation line 1 to the other elements of the system, including the lyres 6, 7, as explained below.

Furthermore, the inflation line 1 comprises an upstream end Ib and a downstream end 1a, respectively, and may be formed of one or more sections fluidly connected to each other through the connectors 11a, 11b, so that ensure a continuity of the air flow from the boat 30 to the lifting unit 31 inflatable. At the same time, the securing means 2a, 2b can also serve to connect several cables 2 "between them.

As shown diagrammatically in FIG. 3, when only one section is used, then the upstream end Ib of the inflation line 1 comes to fluidly connect to one or more gas sources present on the boat, such as gas compressors (no shown), either directly using the connectors 1 Ib, or indirectly via an upstream connecting device 6, also called "upstream lyre" 6, comprising an internal gas circuit equipped with one or more devices regulator 23, 24 of gas. More precisely, as illustrated in FIGS. 3 and 5, an upstream lyre 6 comprises, on the one hand, two input branches 21, 22 each connected to one of the gas sources and each equipped with an expander device 23, 24 of gas and, secondly, an output branch 20 fluidly connected to the two input branches 21, 22 and the upstream end Ib of the inflation line 1. The two input branches 21, 22 comprise check valves 25.

Furthermore, the downstream end 1a of the inflation line 1 is fluidly connected to the immersed object lifting unit 31, either directly using the connectors 11a, or indirectly via a downstream connecting device 7, also called "downstream lyre 7", comprising an internal gas circuit equipped with non-return valve means 25.

The gas circuits of the lyres 6 and 7 are preferably formed, in whole or in part, flexible or flexible gas conduits or ducts.

When several sections are used, for example two successive sections, then the upstream end Ib of the inflation line 1 of the first section is connected as in the previous case to the source or sources of gas under pressure of the boat 30, while the downstream end 1a of the inflation line 1 of this first section is fluidly connected to the upstream end Ib of the inflation line 1 of the second section and is the downstream end 1a of the inflation line 1 of the second section that comes, this time, connect fluidly to the lifting unit 31 of submerged object

In all cases, the different sections, whatever their length and their number, generally less than 6, are connectable to each other via connectors 11a, 1 Ib adapted. Thus, it is possible to use a single section or an assembly formed by the succession of several sections connected together, for example 2 or 3 sections, to form the inflation line 1. The upstream lyre 6 and downstream 7 are then fluidically connected respectively to the first and last sections of a succession of sections thus formed.

The sections may be of the same length or have different lengths, for example the first section may have a length of 200 m and subsequent sections a length of 100 m each. The section or sections simultaneously provide inflation and towing functions.

Advantageously, several sections having different lengths on the side of the lifting unit 31 are provided in such a way as to be able to adapt the total length of the inflation line 1 to each particular case, that is to say in such a way as to take into account more or less large intervention depths. Similarly, it is possible to have several downstream lyres 7 of different lengths, for example of 0.5, 3 and 6 meters in length as illustrated in FIGS. 3 and 7, so that fluid line 1 can be connected fluidly. to different types of lifting units 31. The system of the invention is preferably implemented from a boat, that is to say a boat, a barge or the like, connected to one or more sources of compressed air carried by said boat 30 so as to inflate an inflatable flexible lifting unit 31, open or closed, for example a pocket or an inflatable balloon or an aquatic parachute, intended to allow, under the effect of the buoyancy, to return to the surface or near the surface a submerged load 32, such as an aquatic mine, a torpedo, a wreck or other.

This submerged load 32 can then be towed by the boat 30 itself using the system of the invention since it comprises, on the one hand, downstream securing means 2, 2a, 12a allowing a mechanical stowage from the inflating line 1 to the inflatable lifting unit 31 of gas-fired object through the inflating line 1 and, secondly, upstream securing means 2, 2b, 12b allowing a mechanical stowage of the inflation line 1 at an anchor point present on the boat 30, as shown schematically in Figures 1, 2A and 2B.

However, the submerged load 32 can also be towed by a lighter craft, such as a Zodiac-type inflatable boat, or even by a land vehicle. This is particularly the case when the depth of the water is insufficient for a naval surface vessel to be able to navigate or when the submerged load 32 must be towed to the shore. In this case, the upstream securement means 2b will be hung on the light craft or on the vehicle, which may also be equipped with a pressurized air source enabling the inflatable unit to be fed, if necessary. with in particular a supplement of air via the inflation line; it is also possible to use a (or) open sheave system on the shore to reduce the length of line to tow, especially when the shore on which the load must dock, is small.

A successive use of several different types of vehicles can also be considered for example first a surface vessel to raise the load to the surface then pull it up to a few hundred meters from the side, then a light Zodiac boat or a land motor vehicle to tow the object to the shore.

As illustrated in Figure 4, the inflation line 1 can be stored by being wound on a rotating drum 5 for its storage or, conversely, its rapid deployment and easy. When the immersed object 32, after inflation of the lifting unit 31, is to be towed, then the inflation line section (s) 1 used are fully unwound and the corresponding reel (s) 5 are separated from the working zone. Indeed, in this case, as a towing of the object 32 by the boat 30 must take place, it is not possible to leave an inflation line 1 partially wound on a drum 5 to avoid a deterioration of this- This is because of the tensile forces that will be exercised there.

As an indication, the towed load may require a continuous traction force of 2000 daN. In contrast, when only a lifting of the object 32 is provided, that is to say its detachment from the bottom for example and its bringing to the surface, after full or partial filling of the lifting device 31 by air under pressure, then the most upstream section, that is to say the one on the side of the source or sources of pressurized air, can remain housed on its own drum 5.

Preferably, all the components used to produce the system of the invention are weakly amagnetic. For example, brass, aluminum alloys, stainless steel or non-metallic materials may be used if they are resistant to the conditions of use

For example, a complete line may be formed of a section of 200 meters, two additional sections of 100 meters each, an upstream lyre 6 of 2 meters and a downstream lyre 7 of 6 meters.

Furthermore, it is desirable that an acoustic disturbance attenuation device is provided to limit the acoustic disturbances near the lifting unit 31, during the pressurization of the inflation line 1.

According to the invention, it is therefore clear that the section or sections thus simultaneously provide the functions of inflation and traction / towing. They comprise a single flexible element ensuring the two functions, that is to say the inflation line 1 and the securing means 2a, 2b, in particular the traction line 2 and its protective envelope 2 'containing the sliding cable 2 "The securing means 2a, 2b carried by, for example, a steel cable about 8 mm in diameter, and located at the ends of each section, that is to say on the structure comprising the inflation line 1 and / or on the lyres 6, 7, allow downstream the load to be towed 32 and to fix upstream the inflation line 1 to the boat 30 or the vehicle for towing. In all cases, the sections will be connected together easily, without tools, and the towed load can reach 2 tons.

The upstream connections fitted to the sections are blocked to allow any disconnection without loss of gas in the lifting unit, as for example during the installation of an additional section during a lifting operation in progress after isolation of the source of power. 'air.

A quick release device is set up by the user on the upstream attachment point of the upstream section, it is connected by the user to the towing end attached to the boat. After disconnecting the upstream lyre 6, it allows the user to quickly drop the complete power line in case of difficulty encountered during operations.

The drum or reels 5, equipped with their respective sections, are intended for the storage and implementation of the sections, including the adjustment of the unrolled length.

The downstream fitting is easily stowed on the drum when the section is fully coiled. The design of the frame of the drum facilitates its docking to the boat The upstream lyre 6 with a total length of the order of 2 m for example, is intended to connect upstream line 1 which it belongs to one or two sources pressurized air. It is equipped with 2 regulators 23, 24, one dedicated to each source, to limit the pressure in line 1 to a value compatible with the resistance of the hose constituting said line 1, with the easy implementation of pressurized quick couplers and with the expected airflow. The air sources to which the upstream lyre 6 is connected, require the presence of "caliper" type connections in accordance with ISO 12209-1 (230 bar) for connection to diving blocks (maximum pressure of 200 bar) or express type according to standard NF E 29-573 for connection to an air compressor (maximum pressure of 10 bar). The replacement of an air source by another of the same type or different type can be performed during a current lifting operation, thanks to the presence of check valves 25 and a purge device. The high-pressure parts are advantageously equipped with anti-whip safety cable.

Furthermore, the downstream lyre 7 is preferably available in several lengths, for example 0.5 m, 3 m and 6 m approximately) and allows to connect, downstream, the inflation line 1 of which it is part to the unit of lifting 31, via a male connection or an express connection.

A check valve type device 25 within the downstream lyre 7 prevents any loss of pressure of the lifting unit 31 in case of accidental rupture of a section.

In addition, the downstream lyre 7 has securing devices 7a, 7b (only one in the case of the length 0.5 m) located about 25 cm from each connection to allow its lashing by end of 5 mm (effort maximum traction of 5 daN) As an indication, the gas pressure in the inflation line is generally of the order of 5 to 7 bar, but other pressures are obviously usable, including pressures of 7 to 10 bar. This pressure is used to inflate the lifting unit at a pressure slightly above atmospheric pressure, for example the gaseous pressure is about 0.5 bar or about 1.5 bar in the inflatable unit.

Even if the invention is mainly intended for implementation on a boat-type boat, it can be imagined to also be used on a land motor vehicle which would be equipped in particular with sources of gas under pressure (gas compressor, container of gas under pressure ...).

Claims

claims

1. System for recovering and pulling a submerged object (32) suitable for use on a vehicle, in particular a boat (30), comprising: - an inflation line (1) capable of conveying a gas for at least a source of gas to at least one inflatable object lifting unit (31), said inflation line (1) comprising an upstream end (Ib) intended to come fluidically connected to said at least one gas source and an end down stream (1a) intended to be connected fluidly to said at least one inflatable object lifting unit so as to supply said at least one inflatable object lifting unit with gas delivered by said at least one gas source and conveyed by said inflation line (1),

downstream stowage means (2a, 7a, 7b) allowing direct or indirect mechanical stowage of said inflation line (1) to said at least one inflatable object lifting unit (31) supplied with gas by the inflation line (1), and - upstream securing means (2b) allowing direct or indirect mechanical attachment, of said inflation line (1) to an anchor point present on the vehicle (30) characterized in that

the downstream stowage means (2a) and the upstream stowage means (2b) are situated at the downstream (2a) and upstream (2b) ends, respectively, of a traction line (2), the traction line (2) comprising a cable (2 "), and

- The inflation line (1) and the traction line (2) comprise a first (1 ') and a second (2') hollow and flexible tube, which are secured to one another, the first tube (1 ') for conveying gas and the second tube (2') comprising the cable (2 ") disposed inside said second tube (2 ') and slidable inside said second tube (2') ).

2. Recovery system according to claim 1, characterized in that the downstream tie-down means (2a) and the upstream tie-down means (2b) are fixedly secured to the inflation line (1).

3. Recovery system according to any one of the preceding claims, characterized in that the upstream end (Ib) and the downstream end (la) of the inflation line (1) each comprise a connector (1 la; Ib) adapted to and designed to allow the fluid connection of said inflation line (1).

4. Recovery system according to any one of the preceding claims, characterized in that the inflation line (1) and the traction line (2) comprise a first (1 ') and a second (2') hollow tube. and flexible, which are arranged in parallel with each other and secured to one another forming a structure having a section of "8".

5. Recovery system according to any one of the preceding claims, characterized in that the inflation line (1) is formed of several sections connected to each other, preferably each section comprises a portion of the inflation line (1 ), and downstream securing means (2a) and upstream securing means (2b), the downstream securing means (2a) for mechanically connecting the sections together or to an inflatable lifting unit and the means Upright securement (2b) for mechanically connecting the sections together and at an anchor point of the vehicle.

6. Recovery system according to any one of the preceding claims, characterized in that the upstream end (Ib) of the inflation line (1) is connected fluidly to at least one gas source via an upstream connecting device (6) comprising a gas circuit (20, 21, 22) equipped with at least one gas expander device (23, 24), preferably the gas circuit (20, 21, 22) comprises two input branches (21, 22) each connected to a gas source and each equipped with a gas expander device (23, 24), and an outlet branch (20) fluidly connected to the two inlet branches and at the upstream end (Ib) of the inflation line (1).

7. Recovery system according to any one of the preceding claims, characterized in that the downstream end (la) of the inflation line (1) is fluidly connected to an object lifting unit via a downstream connecting device (7) comprising a gas circuit equipped with a non-return valve means

(25).

8. Recovery assembly of a submerged object comprising a boat comprising at least one pressurized gas source, and at least one inflatable submerged object lifting unit, characterized in that it further comprises a recovery system according to any one of the preceding claims, said recovery system being: fluidly connected to said at least one source of pressurized gas and to said at least one inflatable lifting unit, via the inflating line (1), so as to supply said inflatable lifting unit with pressurized gas delivered by said less a source of gas, and

- mechanically connected to said inflatable lifting unit and at least one docking point carried by said boat.

9. A method of recovering an object immersed in an aquatic environment, in particular at sea, in which a) implementing a recovery assembly according to claim 8, b) securing the inflatable lifting unit to the immersed object to be recovered, c) fluidically connecting said at least one pressurized gas source to the inflatable lifting unit via the inflating line (1), d) mechanically connecting the inflatable lifting unit at least one stowage point carried by the boat by means of the downstream stowage means (2a) and the upstream stowage means (2b), e) at least a partial inflation of the unit is effected inflatable lifting device with pressurized gas delivered by at least one source of gas located in the boat and conveyed by the inflating line (1), f) and if necessary, mechanical traction of the inflatable lifting unit is carried out in the direction of the boat, through the means of ar downstream image (2a) and upstream docking means (2b).

10. Recovery process according to claim 9, characterized in that the submerged object (32) to be recovered is an aquatic mine.