JP3479686B2 - A dedicated vessel for sea recovery of large pressurized membrane structures and its operation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dedicated ship for recovering a large pressurized membrane structure such as a stratospheric retention type airship at sea and its operating method.

[0002]

2. Description of the Related Art A stratospheric retention type airship (hereinafter referred to as a stratospheric airship) is called a stratosphere unmanned platform,
It is a large airship having a body length of 200 to 300 m and is constructed in a pressurized membrane structure in which a thin gas bag, which is a gas barrier membrane, is filled with a floating gas such as helium gas. Stratospheric airships rise due to surplus buoyancy of levitation gas caused by the difference in specific gravity between levitation gas and atmospheric pressure, and release buoyancy gas for surplus buoyancy in the stratosphere at an altitude of about 20 km above the ground (mission altitude) It is used for environmental surveys and radio relays.

After completing the mission in the stratosphere, the stratospheric airship discharges part of the levitation gas and is landed on the sea from the stratosphere by unpowered flight by its own weight, and then is lifted from the sea surface by a crane ship or the like, and the total length is 200 m. It is mounted on a special support ship such as a pontoon type barge and towed to a base on the sea or on the ground, returned to the base and collected.

[0004]

By the way, a stratospheric airship returning from the stratosphere and in a watering state has a length of 200 or less.
It is a large airship of ~ 300m, and it is not easy to pull up such a large airship and mount it on a support-only ship, and even if it could be mounted by a crane ship, there is a risk that the thin-film hull will be damaged on the sea with waves. There is a problem that there is. Therefore, in order to solve such a problem, it is possible to supplement the buoyancy of the stratospheric airship to levitate it, but this is very dangerous in terms of work and is not realistic.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a large-sized pressure membrane that can be safely and easily installed without damaging a stratospheric airship. The purpose of the present invention is to provide a marine recovery vessel for structures and its operation method. The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0006]

[Means for Solving the Problems] In order to achieve the above object,
A large-scale pressure membrane structure dedicated marine recovery vessel according to the present invention is a marine recovery dedicated vessel that carries a large pressurized membrane structure landed on the sea and is towed and collected. A deck for mounting a large pressure membrane structure is provided on one or more semi-submersible lower hull floats, and it is possible that the deck dives or floats by injecting or draining the seawater ballast into the lower hull floats. It is a feature,
The large-sized pressure membrane structure is characterized by being a stratospheric retention type airship.

In addition, according to the method for operating a large-scale pressure membrane structure dedicated marine recovery ship according to the present invention, a seawater ballast is placed in a semi-submersible lower hull floating body in the vicinity of the large pressure membrane structure landed on the sea. By injecting and diving the deck above the lower hull floating body, after entering the deck below the large pressure membrane structure, by draining the seawater ballast in the lower hull floating body and floating the deck. It is characterized in that the large-sized pressure membrane structure is mounted on the deck.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In describing the embodiments, components having the same function are designated by the same reference numerals. FIG. 1 is a partially cutaway front view showing a mounted state of a stratospheric airship on a marine recovery dedicated ship according to one embodiment of the present invention, and FIG. 2 is on a marine recovery dedicated ship according to one embodiment of the present invention. It is a partially cutaway side view showing a mounted state of a stratospheric airship.

In FIGS. 1 and 2, a propulsion device is provided at the rear of the marine recovery dedicated vessel 10, and trimming, roll and draft adjustment facilities are provided at predetermined portions. In the special marine recovery vessel 10, a plurality of semi-submersible lower hull floaters 11 each having a substantially U-shape are connected by a connecting member 12 so that their upper surfaces are flush with each other, and a stratospheric airship 20 is mounted on these lower hull floats 11. A rectangular plate-shaped deck 13 is fixed for mounting.

The seawater ballast 40 is injected into the lower hull floating body 11, and the seawater ballast 40 is fed into the lower hull floating body 11.
The lower hull floating body 11 by the ballast pump installed in the
It is possible to inject and drain. A plurality of film body pillows 1 each having a columnar shape on both edge portions in the width direction of the deck 13
When the stratospheric airship 20 is mounted, the stratospheric airship 20 is positioned on the deck 13 and supported on both left and right sides of the stratospheric airship 20 to fix the stratospheric airship 20.
Is prevented from falling on the sea surface 30 from above the deck 13. On the deck 13, equipment such as an automatic tension reel for lashing the stratospheric airship 20 and a folding derrick winch, and equipment such as a replenishing helium gas tank are arranged.

The stratospheric airship 20 is a streamlined balloon,
The pressurized membrane structure includes a hull 21 mainly composed of a gas bag which is a gas barrier film and a tail 22 and the inside of the hull 21 and the tail 22 is filled with helium gas which is a floating gas.

The stratospheric airship 20 is a large airship as a stratospheric unmanned platform that is used for earth environment observation and radio relay by staying in the stratosphere for a long period of time. It rises due to surplus buoyancy of helium gas, and surplus buoyancy at mission altitude. Minutes of levitation gas are released and accumulated, and when descending, part of the helium gas is discharged and descends to the sea by its own weight.

Next, a method of operating the marine recovery dedicated vessel constructed as described above will be described. First, after the mission in the stratosphere is completed, the dedicated marine recovery vessel 10 is made to stand by in the vicinity of the stratospheric airship 20 that has landed on the sea surface 30 from the stratosphere. After that, the seawater ballast 40 is injected into the lower hull floating body 11 of the special marine recovery vessel 10 and the deck 13 on the lower hull floating body 11 is injected.
To dive, the deck 13 is advanced below the stratospheric airship 20, and the stratospheric airship 20 is captured.

After that, the seawater ballast 40 in the lower hull floating body 11 is drained to float the deck 13 to mount the stratospheric airship 20 on the deck 13, and then the stratospheric airship 20 is lashed so as not to move. Thus, the stratospheric airship 20 is mounted on the ocean recovery dedicated ship 10, towed to a base on the sea or on the ground, returned to the base, and recovered. The trim and roll adjustment of the dedicated marine recovery vessel 10 is performed by individually changing the amount of seawater ballasts 40 in the plurality of lower hull floating bodies 11.

As described above, in the present embodiment, when the stratospheric airship 20 is recovered, the deck 13 on the Lower Hull floating body 11 is submerged / floated by injecting / draining the seawater ballast 40, so that the special marine recovery ship 10 operates. Since the stratospheric airship 20 is mounted so as to be picked up, the stratospheric airship 2
The mounting work of No. 0 becomes easy, and the mounting work can be realized safely without being affected by sea waves and without damaging the stratospheric airship 20.

The marine recovery dedicated vessel for large-sized pressure membrane structure and the operating method thereof according to the embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-mentioned embodiments. Various changes in design can be made without departing from the spirit of the invention described in the claims of the invention. For example, in the present embodiment, the marine recovery dedicated vessel 10 is composed of a plurality of lower hull floating bodies 11.
It may be composed of one lower hull floating body 11. Further, although the marine recovery dedicated vessel 10 of the present embodiment navigates by itself by the propulsion device, it may be towed by a tugboat. further,
A trolley may be mounted on the deck 13 of the ocean recovery dedicated ship 10, and the stratospheric airship 20 may be mounted on this trolley. In addition, when installing a stratospheric airship 20 with a total length of about 250 m,
It is advisable to set the total length of the dedicated marine recovery vessel 10 to about 200 m.

[0017]

As will be understood from the above description, according to the present invention, when the stratospheric airship is recovered, the stratospheric airship is mounted on the marine recovery-dedicated ship by injecting / draining seawater ballast to / from the lower hull floating body. A stratospheric airship can be easily and safely not affected by ocean waves, and can be safely and safely mounted on a marine recovery-dedicated ship.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a mounted state of a stratospheric airship on a marine recovery dedicated ship according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a mounted state of a stratospheric airship on a marine recovery dedicated ship according to an embodiment of the present invention.

[Explanation of symbols]

10 Marine Recovery Dedicated Ship 11 Lower Hull Floating Body 12 Connecting material 13 decks 14 Membrane pillow 20 Stratospheric Airship 21 hull 22 tail 30 sea level 40 seawater ballast

Claims (2)

(57) [Claims] 1. A marine recovery-dedicated vessel for a large pressure membrane structure, which is equipped with a large pressure membrane structure landed on the sea and towed and recovered. One or more semi-submerged seawater ballasts are injected and drained. A deck for mounting a large pressure membrane structure is provided on a water-type lower hull floating body, and has a columnar shape at both edge portions in the width direction of the deck.
A plurality of membrane pillows arranged in a row and fixed, and by injecting the seawater ballast into the lower hull floating body, the deck is dipped and it is made to enter below the large pressure membrane structure.
The deck is floated by draining water from the lower hull and the large pressure membrane structure is scooped up.
A large-scale pressure membrane structure marine recovery-dedicated ship that can be loaded. 2. The large-scale pressure membrane structure dedicated marine recovery ship of claim 1, wherein the large pressure membrane structure is a stratospheric retention type airship.