FR2804933A1 - Landing craft for use on non-docking shores is of catamaran type with movable platform between hulls and ramps at each end - Google Patents

Abstract

The landing craft is of the catamaran type with a movable platform (15) between its two hulls. The platform in the form of a caisson supports loads on its upper part. A deployable ramp (18,19) is provided at each end of the platform.

Description

The present invention relates to a mobile device secured to a ship making it possible to vary the draft of a ship by mechanical displacement of rigid elements and which provide additional buoyancy, along its hull or hulls.

It applies particularly to a fast ferry type ship for embarkation and disembarkation of vehicles and people from or to shores or shores, whether or not equipped, or from or to host ships, whether or not equipped such as pontoons, rafts, docks, barge transport.

Usually, fast ferry type ships, for example hydrofoil catamarans, have a high draft, which does not make it easy to transfer vehicles or people from these ships, whether this transfer is from or to the banks. , shores, docks, host ships, and in general in any place which does not have a sufficient depth of water at the place of transfer. In particular, they cannot transfer their cargo to shorelines with a very slight slope or on barge transports whose receiving raft cannot be submerged enough to receive the ferry.

The ferry device according to the invention overcomes these drawbacks allows # An approach to shore, shore, or another ship with a very shallow draft.

 # A high speed cruise.

 # Easy maneuverability at low speed. # A high carrying capacity.

This is achieved by means of a faith-me modification configuration with two modes described below. A transit or navigation mode, and an approach mode.

In transit mode, the ferry has a navigation configuration on one or two slender hulls allowing high speed even in heavy seas. The load to be transported is carried on a platform located at the top of the hull (s).

In approach mode, close to the shore or deep sea. or of the host ship, the platform is lowered to the bottom of the hull (s) and provides additional buoyancy allowing the reduction of the draft.

This process then makes it possible to disembark from the ferry or to embark on vehicles and people on the ferry by a conventional mobile ramp.

The platform can be equipped with a front ramp and a rear ramp that it can deploy when it is in the low position instead of loading or unloading.

The platform fitted with its deployed ramp or ramps thus constitutes a loading lane and is well suited to a configuration for loading vehicles in a row, for loading and unloading.

The ferry device according to the invention can be used for any rapid transport (of people, materials, vehicles) by sea or river such as for example # Transport of environmental protection material making it possible to bring to any point from the coast or from the riverbanks of civil protection equipment.

 # Transport for humanitarian actions on an undeveloped shore. # Transport and disembarkation of military equipment and personnel.

 # River or maritime transport without port facility or with limited facilities, or with very low draft.

 # Sea transport of products from an ocean-going vessel to a shore or coastline not equipped with port facilities or with very low draft.

Figure 1 shows an application of the invention for a ship with two hulls.

According to this embodiment according to the invention, the fast ferry is characterized in that it comprises lateral hulls (1) and (2), a mobile platform (3) located between the hulls supporting the load to be transported (4), a device ensuring the connection of the floats, a lifting system (5) of the mobile platform (3). The lifting device (5) is associated with a guide system (6), with a locking device in the high (7) or low (8) position, with a positive bidirectional power control (9). The implementation of the lifting system (5) can advantageously be carried out during a low-medium transit phase. The figure shows an access ramp (13).

According to the invention, the mobile platform (3) is a sealed box.

According to the invention the device for connecting the shells (1) and (2) consists of a resistant structure produced for example by fixed beams in the upper part (10) linked to the shells (1) and (2) by welding or mechanical assembly. The whole constitutes a catamaran.

According to another embodiment according to the invention, the hulls are connected by _xed beams in the upper part (10) associated with profiled beams in the form of wings (11) connecting!, Hulls (1) and ( 2) in their lower part. These profiled beams (11) form with the shells (1) and (2) and the upper beams (10) of the frames making it possible to ensure the rigidity of the assembly. The profiled beams (11) can be constructed so as to provide a lift effect and thus improve the behavior at sea beyond a certain speed. Movable flaps (i 2) may possibly be arranged in the lower profiled beams so as to adjust the navigation attitude according to the balance of the masses and the sea conditions. May optionally be used as stabilization devices for rapid transits at sea mites.

The guide system (6) of the mobile platform (5) may be constituted by mechanical guidance on rails, by articulated arms, chains, or any other suitable device.

According to the i-1vention, the locking device in the high (7) or low (8) position of the platform advantageously consists of pins or of retractable or non-retractable brackets, or mechanical locks or any other suitable system.

According to the invention the positive bidirectional power control (9) can be constituted by double-acting cylinders acting directly on a mobile platform or by means of the articulated arms mentioned above or of racks, or by winches actuating cables. , or by geared motors driving chains, or any combination of the above, or any other bidirectional power control system.

Claims (9)

1) Mobile device secured to a catamaran ship, characterized in that it comprises a mobile platform consisting of a watertight box (3), carrying the load to be transported (4), a lifting and lowering device (5) of the mobile platform (3) between the upper low parts of the hulls (1) and (2) of the ship, a guidance system (6) of the mobile platform, a locking system in the high position (7) and locking in the low position (8) of the mobile platform, one or two access ramps (13) secured to the mobile platform. 2) Device according to claim 1 characterized in that the lifting and lowering device of the mobile platform makes it possible to lower the latter to the low level of the hulls, and to raise it in the upper part of the hulls. 3) Device according to claims 1 and 2 characterized in that a bidirectional power control system (9) actuates the lifting device. 4) Device according to claim 1 characterized in that the connection of the shells is ensured by fixed beams (10) connecting them in their upper part. 5) Device according to claims 1 and 4 characterized in that the connection of the shells is provided by profiled beams (11) in the lower part. 6) Device according to claim 5 characterized in that the profiled beams (11) are provided with movable flaps (12). 7) Device according to claim 1 characterized in that the guide system (6) is constituted by mechanical guidance on rails or by articulated arms or by chains. 8) Device according to claim 1 characterized in that the locking in the high position (7) and the locking in the low position (8) of the platform are pins or retractable brackets or mechanical locks. 9) Device according to claim 3 characterized in that the bidirectional power control system is a double-acting cylinder acting on cables or on articulated arms or winches actuating cables or drive systems acting on chains.