JPS6018484A - Method of bulding floating dock from two existing tankers - Google Patents

Abstract

PURPOSE:To simplify the remodeling of two tankers into floating docks, by carrying out such a method that after the periphery of the top deck of a side tank on each of the adjacent sides of two tankers arranged side by side, is cut, the cut-off top deck is lowered by about 1/3 of the depth of the tanker and rejointed to the hull of the tanker, the top deck of the center tank in each tanker is also cut off, and therefore a double bottom structure is obtained. CONSTITUTION:After arranging two tankers 3 of similar types in a dock 15 side by side, the bow section of each tanker is cut and removed off at a position just before the transverse bulkhead of the front of the tank section. Further, the center tank top deck 15, 16 of each tanker 3 and aggregates 17 attached thereto are cut off along the peripheries thereof over a predetermined extent, and are lowered down to the hull bottom to be rejointed thereto so that a double bottom structure is obtained. Then, the periphery of the top deck 19, 20 of a side tank on each of the adjacent hull sides of both tankers 3 is cut off, and as well the hull side shell plating 21, 22, longitudinal bulkhead 9, 10, etc. below the top deck 19, 20 of each tanker is cut and removed off by about 1/3 of the depth of the tanker. Thereafter, the top deck 19, 20 is jointed to the cut-off section of the remaining hull of each tanker to obtain a floating dock 1, 2. With the use of both floating docks 1, 2 a large size marine structure such as, for example, a petroleum digging rig may be carried thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method of converting a two-tank force into a floating dock.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method by which an old or idle tongue force can be easily converted into a floating dock and used effectively.

The method according to the present invention is a method of converting a tank between two ships into a floating dock, in which the tank section between the bow and the stern is divided into a center tank and side tanks by two rows of longitudinal bulkheads,
cutting off and removing the bows of the two Tanpower vessels, cutting around the upper decks of the medium-fired tanks of the two Tanpower ships and lowering them to the bottom of the ship to form a double bottom; The area around the upper deck of the tank on the staff side of the tank and the area around the upper deck of the tank on the plastering side of the other ship were cut - these were then lowered to about 1/3 of the depth of the ship.・It consists of joining to the hull.

Modification of the two ships' tongue forces may be performed in sequence with one of them being done first, or both may be performed in parallel. Then, using J''3 to modify each tank, cut and remove the bow, cut around the upper deck of the medium-fired tank, and lowered it to the bottom of the ship to form a double bottom. This and cutting off the circumference of the upper deck of the tank on one side, lowering it to about 1/3 of the depth of the ship and joining it to the hull were done one after the other in an appropriate order. Alternatively, all or part of the steps may be performed in parallel.

According to the present invention, old or idle tongue force can be converted into a floating dock and effectively utilized. In addition, we mainly removed the bow of the tank, lowered the upper deck of the central tank with its circumference cut off to the bottom of the ship, and joined it together. Renovation work is easy because it can be joined only by a single screw.

The present invention will be described in detail below with reference to the drawings.

Figures 3 and 411 are two floating docks (1) after modification.
(2), and Figure 1 shows the tan power of the two ships before modification (3) (
4) shows a cross section. The two tanks (3) and (4) are almost the same type, and the hull (5) 15 of the first tank (3) and the hull (6) of the second tank (4) are separated by transverse bulkheads. It is divided into a bow section, a stern section (7), (8) and a tank section between the stern sections. The tank part is divided into a plurality of front and rear compartments by a plurality of horizontal bulkheads, and these compartments are divided into a central tank (11) (12) and a side tank (13) by two rows of vertical bulkheads (9) and (10). (14).

These two tankers (3) and (4) are converted into two floating docks (1 and 2) through the steps shown in Figure 2 as follows.

First, as shown in Figure 1, the two tank forces (3) (4)
are lined up in the dock (15) and docked. Then, the bows of the two tanks (3) and (4) are cut and removed just in front of the transverse bulkhead at the front end of the tank section. Next, as shown in Figure 2,
The center tank upper deck (1) of the remaining two hulls (5) (6)
5) (1G) and bone U (17) attached to these (
18) in front of the transverse bulkhead at the rear end of the tank and just inside the vertical bulkheads (9) and (10) on both sides, and cut the area under these central tank upper decks (15) and (18). Cut and remove the transverse bulkhead at the front end of a certain central tank (11) (12), the transverse bulkhead J3 at the middle part of the central tank (11) (12), and the intermediate part at the height of the aggregate. These central tank upper decks (15, 16) are then lowered to an appropriate height on the bottom of the ship using a crane or the like and rejoined to the ship's hull (5, 6), thereby forming a double bottom. Next, the first tongue force (
3) around the tank upper deck (19) on the personnel side and the second
Cut around the tank upper deck (20) on the outer side of the tongue force (4) immediately in front of the transverse bulkhead at the rear end of the tank, and cut under these side tank upper decks (19) and (20). Certain ship side shells (21) (22), longitudinal bulkheads (9,
) (10), remove the transverse bulkhead and the upper part of the aggregate by cutting approximately 1/3 of the depth of the ship, and remove the upper part of the central tank (15).
Almost in the same way as in case (16), these side tank upper decks (19) and (20) are lowered to about 1/3 of the depth of the ship and rejoined to the hull (5) < 6). In addition, the hull (5)
Upper deck of the central tank (15) separated from (6) (1(
3) and when rejoining the side tank upper decks (19) (20), aggregate can be added if necessary. As a result, two symmetrical floating docks (1)
(The main part of 2> is completed.

The cross sections of the two floating docks (1) and (2) except for the stern parts (7) and (8) are approximately U-shaped, and their front ends are open. In the first floating dock (1), the tank on the ancient literature side (13) is lower than the tank on the plasterer side (13),
In the second floating dock (2), the tank on the plastering side (14) is lower than the tank on the ancient writing side (14). Also,
Since the engine room and propulsion device remain in the stern sections (7) and (8), these floating docks (1) and (2) can navigate on their own.

Upper tank deck (23) on the plastering side of the first floating dock (1)
and the upper tank deck of the second floating dock (2) on the military side (
Rails (25) (26) and cranes (27) (28) that travel on these are provided on top of the rails (24), respectively. In addition, the tank on the plastering side of the first floating dock (1) (
13) Middle deck (29) (30) at the top of the tank (14) on the ancient side of ct3 and the second floating dock (2)
will be newly established as a parts manufacturing factory, and these side tanks (13
) There are entrance gates (33) (34) and doors (35) (32) for loading and unloading parts on the hull side panels (31) (32) of (14).
6).

The two floating docks (1) and (2) are floated on the sea surface as shown in Figure 3 J3 and Figure 4, and are floated until the center tank upper deck (15) (16) is above the sea surface by adjusting the ballast. or lower to a semi-submersible state where the upper decks of the center tank (15, 16) are submerged below the sea surface, leaving the upper ends of the lower side tanks (13, 14) intact. In this way, when lowering the floating docks (1) and (2) to a semi-submersible state, there is no need to submerge the lower side tanks (13) and (14), so the lowering of the floating docks (1) and (2) , levitation operation is easy. In addition, without removing the ancient tank (13) of the first floating dock (1) and the plastering side tank (14) of the second floating dock (2), they can be removed to 1/2 the depth of the ship. Since it is about 3 lower, the hull (5
) (6) It is easy to ensure the longitudinal strength.

Next, referring to Figures 3 and 4, a large offshore structure (37) such as an oil drilling rig is placed on two floating docks (1) (
In 2), the procedure for pinching and storing will be explained.

This m pickle (37) consists of a structure main body (38) and a plurality of legs (39) attached to this so as to be able to rise and fall freely,
Usually, the main body (38) is fixed to a portion above the sea surface of the legs (39) that have landed on the seabed. This 4!8 creation (
31) in the floating docks (1) and (2), raise the legs (39) so that they protrude slightly below the main body (38), and raise them so that the main body (38) is above the sea level. Let it float. And two floating docks (
1) Move the structure (2) so that the official side of the first floating dock (1) and the outer clothing side of the second floating dock (2) approach each other, and the structure (37) is in front of them. (37) and sink it to a semi-submersible state.Next, move the two floating docks (1) and (2) forward in a semi-submersible state, and lower these lower side tanks. (13) (14) is positioned below the center of the main body (38), and the center tank upper deck (15) of the first floating dock (1) is placed below the left leg (39). Position the center tank upper deck (16) of the second floating dock (2) below the left leg (39).Next, move the two floating docks (1) and (2) at the same speed. Gradually float to the top of these central tanks (1
5) Support the legs (39) on (16) and float the two floating docks (1) and (2) until the upper decks of the central tank (15) and (16) are above the sea surface, and then lift the structure. (37)
lift it above sea level. For example, when repairing the plum pickle main body (38), you can leave it as is, but when repairing the lower end of the leg (39), for example, as shown in Fig. 4, gradually remove the main body (37>). The central part is placed on the lower side tank upper deck (19) (20) of the two floating docks (1) (2), and the both sides are placed on the lower side tank upper deck (19) (20) of the two floating docks (1). (2> central tank upper deck (15) (16)
Support each via a board, etc. on top, and install the necessary legs (39
) is raised relative to the main body (38).

When accommodating a small ship or offshore structure, one of the floating docks (1) and (2) is used alone. In this case as well, the floating docks (1) and (2> are lowered to a semi-submerged state, and ships and marine structures can be docked or docked from their front ends.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of two tugboats before modification, and FIG. FIG. 3 is a plan view showing a state in which a large marine structure is sandwiched between two floating docks, and FIG. 4 is a vertical sectional view of the same. (1) (2>... floating dock, (3) (4 tons... tongue force, (5) (6)... hull, (7) (8)... stern, (9) (10)...Longitudinal bulkhead, '(11) (1
2)...Central tank, (13) (14)...Side tank, (15) (16)...Central tank upper deck, (1
9) (20)...Side tank upper deck. 4 people other than the above

Claims (1)

[Claims] This is a method of converting two tanks into floating docks, in which the tank section between the bow and stern is divided into a center tank and side tanks by two rows of vertical bulkheads, and the bow section of the two tanks is divided into a center tank and side tanks by two rows of vertical bulkheads. After cutting around the upper decks of the central tanks of the two tanks, they were lowered to the bottom of the ship to form a double bottom, and the tank on the civilian side of one of the tanks. A method consisting of cutting around the upper deck and around the tank upper deck on the plastering side of the other tongue, and then lowering these to about 1/3 of the depth of the ship and joining them to the hull.