JPH02237B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention is used for attaching and detaching a portable propulsion device to the bottom of a marine mobile structure such as a marine crane or ship underwater without dry docking it. The present invention relates to a propulsion device attachment/detachment device for a marine mobile structure, which allows the propulsion device to be smoothly attached and detached.

(b) Prior Art Since it is often difficult to attach propulsion devices to large marine mobile structures during the manufacturing process, in recent years propulsion devices have been attached or replaced at sea after being launched. Figure 1 shows a marine crane, which is an example of a marine mobile structure, with a portable propulsion machine 2 attached to the bottom 1b of its legs 1a, which is sealed with water by a bonnet 2a.
It shows the state where the device is being installed underwater 3 and the state where it has already been installed. This kind of installation work is described in Japanese Patent Application Laid-open Nos. 51-147893 and 1978-147894.
This is accomplished by devices such as those described in Japanese Patent Laid-Open No. 51-147896 and the like, and for example, by a propulsion device attachment/detachment device 4 as shown in FIGS. 2a and 2b. First, the propulsion device main body 2b is lowered into the water 3 by a plurality of ropes 5 operated by a crane 1c shown in FIG. The trolley 6 is fitted into the guide rail 7 by an operator underwater 3. The lateral movement rope 8 to which the support rope 5a is connected is connected to the arrow M by a device (not shown).
direction and moved directly below the mounting casing 9. Next, at that position, the lifting rope 10 is attached by the operator in the water 3 to the end 12a of the lifting fitting 12 at the lower end of the chain block 11 suspended within the leg 1a, and there, as shown in FIG. As shown, it is lifted up using the chain block 11 and carried into the mounting casing 9. When the flange 2c is fixed to the mounting seat 1d on the bottom portion 1b with bolts or the like, mounting on the marine crane 1 is completed. Note that the propulsion device 2 is removed and carried out in the reverse order to the above.

When attaching and detaching such a portable propulsion device, the weight of the propulsion device itself is as much as 60 tons, and the lifting capacity of the aforementioned chain block installed in the narrow legs may not be sufficient. , the problem is that sometimes it can be extremely dangerous if it breaks. In addition, the trolley necessary to properly guide the heavy propulsion unit to the position directly below the mounting casing and the guide rails that guide the trolley must be made durable, and as they become larger, This will increase costs. In addition, underwater workers must guide the propulsion unit and stop it appropriately.
It is necessary to have close contact with workers on the marine mobile structure who operate cranes, chain blocks, etc., and such communication is time-consuming and lacks accuracy.

(c) Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and the first invention aims to reduce and adjust the weight of the propulsion machine body underwater, so that it can be easily used during salvage work using a chain block or the like. The purpose of the second invention is to provide a propulsion device attachment/detachment device for a marine mobile structure that can avoid the occurrence of dangerous situations and simplify the guidance device. A propulsion unit attachment/detachment device for marine mobile structures that allows underwater workers to accurately and efficiently guide attachment/detachment by controlling the posture and weight of the propulsion unit themselves while visually observing the propulsion unit during loading/unloading work. The purpose is to provide

(d) Structure of the Invention The structure of the first invention will be explained with reference to FIGS. A buoyancy tank 20 is detachably provided to adjust the weight of the main body 2b in water when the main body 2b is attached or detached.

The structure of the second invention will be explained with reference to FIGS. 6a and 6b. In addition to the structure of the above-mentioned invention, air supply hoses 52 and 53 are connected to the buoyancy tanks 50 and 51, and a marine mobile structure is constructed. 1 to the air control valves 54 and 55 in the marine mobile structure 1.
Air control valve 5 is installed underwater 3 outside the main body of
4.55 remote control terminals 57 are provided.

(e) Examples Hereinafter, the first invention will be described in detail based on examples thereof. Figures 3a and 3b are embodiments of the propulsion unit attaching/detaching device 70 for marine mobile structures;
A buoyancy tank 20 that can reduce or adjust the weight in the water 3 is detachably attached to a seat (not shown) provided on the lower surface of the tank b with bolts or the like. When the buoyancy tank 20 is a non-deformable steel tank, it is provided with a manual valve 20a for removing air from inside the tank and a manual valve 20b for introducing seawater. Further, if the buoyancy tank 20 is a flexible rubber tank or the like, a manual valve 20a for air removal is provided.

The mounting casing 9 into which the propulsion unit body 2b is carried includes, for example, a lower body 9c that is fixed to the bottom 1b and cannot normally be removed, and a cover on top of the lower body 9c that prevents seawater from entering the leg 1a. The cover 9a is provided with a viewing window 13 and a through hole 9b through which the lifting fitting 12 can be moved up and down in a watertight manner. A drain pipe 14 for removing seawater extends from the mounting casing 9 and is connected to a drain pump 17 via a stop valve 15. In addition, as described in the section on the prior art, a chain block 11 is provided for raising or lowering the propulsion machine main body 2b that has been moved directly below the mounting casing 9.

According to such an embodiment, the attachment/detachment work can be performed as follows. As shown in FIG. 3a, first, the propulsion unit body 2b is integrated with a removable buoyancy tank 20 filled with air in advance, and is lowered into the water 3 by a plurality of ropes 5 operated from a crane (not shown) or the like. suspended. When the trolley 6 reaches the vicinity of the bottom 1b, the operator in the water 3 inserts the trolley 6 into the guide rail 7. The operator in the water 3 uses manual valves 20a and 20b, for example, to slightly adjust the attitude of the propulsion unit body 2b as necessary.
The buoyancy of the buoyancy tank 20 is adjusted by opening the buoyancy tank 20 and removing the air inside it or introducing seawater. In addition,
If the buoyancy tank 20 has a buoyancy that is slightly lower than the weight of the propulsion unit body 2b in water, the movement work will be easier, and even if the buoyancy is reduced as necessary as described above, the subsequent Provides sufficient buoyancy for work. When the lateral movement rope 8 is pulled in the direction of arrow M by a crane or the like, the trolley 6 moves along the guide rail 7, and the propulsion unit body 2b is carried directly below the mounting casing 9.

Next, at that position, the rope 10 is lifted from the lower end of the chain block 11 by the operator in the water 3.
It is attached to the end 12a of 2. As shown in FIG. 3b, when the flange 2c of the main body 2b of the propulsion unit is pulled up in the direction of the arrow N and comes into contact with the mounting seat 16 provided on the bottom part 1b, a sealing material (not shown) is sandwiched at that position. The propulsion unit main body 2b is fixed by an appropriate number of bolts 18 in such a manner that the main body 2b is fixed. At this time as well, since the weight of the buoyancy tank is reduced by the buoyancy of the buoyancy tank, even the chain block 11 with a small lifting force can be easily carried into the mounting casing 9. Note that since the installed casing 9 is filled with seawater before the propulsion unit main body 2b is brought in, the drainage pump 1 must be monitored through the viewing window 13.
Perform drainage work according to step 7. After confirming the completion of drainage, the cover 9a is removed from the lower body 9c and the chain block is evacuated. Therefore, the water seal bonnet 2a is removed from the main body 2b, and as shown in FIG. It will be installed. A new prime mover 36 is installed on the support 19 from which the chain block 11 has been removed, and its output shaft 37 and the propulsion device 2 are connected by an intermediate shaft 38. At the same time as this operation, the buoyancy tank 20 is removed. In addition, when removing the propulsion device main body 2b from the bottom portion 1b, it can be easily removed by performing the procedure in reverse to the above.

Figures 5a and 5b show different embodiments.
A buoyancy tank 31 whose weight in water 3 can be adjusted is divided into a plurality of parts (three in the figure) and detachably attached to the tank b. As described in the above embodiment, this buoyancy tank 31 may be made entirely of steel or a flexible material, or some may be made of steel and the others may be made of a flexible material. Although not shown, the manual valves 20a and 20b described in the previous embodiment are provided as necessary.

According to such an embodiment, the weight in the water 3 is reduced by the buoyancy of the plurality of buoyancy tanks 31, and the attitude of the tank can be adjusted extremely easily by appropriately adjusting the buoyancy of each tank. Therefore, the operator underwater 3 can easily move the propulsion unit body 2b along the guide rail 7 while communicating with the operator on the marine moving structure.
In this example, the underwater attitude of the propulsion unit can be corrected more precisely than in the previous embodiment, and the efficiency of attachment and detachment work is further improved.

6a and 6b show embodiments of a different invention, in which one buoyancy tank 50 or each buoyancy tank 51 divided into a plurality of parts is detachably attached to the propulsion unit body 2b, and the weight in the water 3 is adjusted. Air supply hoses 52 and 53 are connected to this buoyancy tank 50 or 51, and air control valves 54 and 55 in the marine mobile structure are connected to the other end. Air control valves 54 and 55 are installed underwater 3 outside the main body of the marine mobile structure.
A remote control terminal 57 is provided via a flexible control power line 56.

According to this embodiment, the operator underwater 3 uses the terminal device 57 while observing the attitude of the propulsion device body 2b.
buoyancy tanks 50 and 5 selected by themselves by operating
The buoyancy can be increased or reduced by replenishing or removing air from 1. underwater 3
For example, a worker in a non-deformable steel buoyancy tank 5
Air control valve 5 to increase the buoyancy of 0
4 and press the button on the remote control terminal 57 to open the buoyancy tank 50.
Air is replenished from a compressed air source (not shown) through the upper hose 52, and the seawater inside is extracted from the lower hose 52. In addition, the buoyancy tank 50 made of a flexible body is replenished with air through a hose 52 at the top of the buoyancy tank 50. To reduce buoyancy, a pushbutton can be pressed to perform the opposite operation. In the case of a plurality of divided buoyancy tanks 51, the buoyancy can be similarly increased or reduced by pressing the push button on the remote control terminal 57 for each air control valve 55.

That is, the propulsion unit body 2b is attached to the casing 9.
When transporting the propeller body 2b into the water, the operator in the water 3 operates the terminal device 57 to replenish the buoyancy tank 50 or 51 with air, thereby increasing the buoyancy, and the weight of the propulsion unit body 2b in the water 3 is reduced by the buoyancy. Because of this, it is smoothly carried into the mounting casing 9, and the bottom part 1b
It is fixed to and incorporated into the leg 1a. In addition, when the buoyancy tank 50 or 51 is made of a steel plate, in order to manually adjust the buoyancy, there is a manual valve 20a for removing the air inside the tank, and a manual valve 20b for introducing water into the tank as the air is removed. Needless to say, it may be provided in

Therefore, underwater workers can automatically and freely adjust the buoyancy of the selected buoyancy tank by observing the attitude of the propulsion unit themselves and operating the terminal, allowing them to use their legs during most of the attachment and detachment work. Problems with laborious communication and lack of accuracy in that communication between workers within and on the offshore mobile structure can be avoided, especially when lifting the propulsion body into the mounted casing due to the buoyancy of the buoyancy tank. This can make salvage easier and greatly improve work efficiency.

(f) Effects of the invention As can be seen from the description of the embodiments above, the present invention has the following effects:
In the first invention, a large, heavy propulsion device is equipped with a buoyancy tank that has a buoyancy comparable to its weight in water.The buoyancy reduces the weight of the propulsion device itself, making it easier to attach and detach the device, especially directly below the attached casing. The salvage operation using the chain block becomes easier, and dangerous situations such as those caused by the chain block being cut can be avoided. There is no need to make the trolley necessary for laterally moving the propulsion machine body directly below the mounting casing, the guide rail for guiding the trolley, etc. strong, and an increase in cost can also be avoided.

In addition to the above-mentioned effects, in the second aspect of the invention, the buoyancy of the buoyancy tank can be adjusted by the underwater worker himself by operating the terminal device, so that work efficiency can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a front view of a working state in which a propulsion device is attached to a marine crane, which is an example of a marine mobile structure, and the state after attachment, and Figures 2 a to c are explanatory diagrams of conventional propulsion device attachment work. So, Figure b is the same as Figure A.
The line arrow views and FIGS. 3a and 3b are examples of the first invention,
Figure 4 is a front view of the installed propulsion unit, Figures 5a and b are illustrations of attachment and detachment of the propulsion unit of different embodiments of the first invention, Figures 6a and b are
FIG. 2 is an explanatory diagram of attachment and detachment of a propulsion device in a different embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Marine mobile structure, 1b... Bottom, 2... Propulsion machine, 2b... Propulsion machine main body, 3... Underwater, 9... Mounting casing, 20, 31, 50, 51... Buoyancy tank,
52, 53... Hose, 54, 55... Air control valve, 57... Remote control terminal, 7
0...Propulsion unit attachment/detachment device.

Claims (1)

[Scope of Claims] 1. A propulsion device for attaching and detaching a propulsion device to the bottom of a marine movable structure underwater without dry docking the structure, comprising: a buoyancy tank for adjusting the weight of the propulsion device in the water; A propulsion unit attachment/detachment device for a marine mobile structure, characterized in that the propulsion unit is detachably provided. 2. The propulsion device attachment/detachment device for a marine mobile structure according to claim 1, wherein the buoyancy tank is a flexible tank that can be expanded and contracted. 3. The propulsion device attachment/detachment device for a marine mobile structure according to claim 1, wherein the buoyancy tank is divided into a plurality of units. 4. A propulsion device for attaching and detaching a propulsion device to the bottom of a marine movable structure underwater without dry docking the structure, in which a buoyancy tank for adjusting the weight of the propulsion device in the water is detachably attached to the propulsion device; An air supply hose is connected to this buoyancy tank and also connected to an air control valve inside the marine mobile structure, and a remote control terminal for the air control valve is provided underwater outside the main body of the marine mobile structure. , A propulsion unit attachment/detachment device for a marine mobile structure.