JPS6322795A - Disolution method for ship - Google Patents

Abstract

PURPOSE:To enable efficient dismounting of a ship at a low cost, by a method wherein cutting is applied, in order, on a main plate in a region surrounded with a longitudinally extended member in the direction of the length of a ship and a lateral member crossing the longitudinal member at right angles, a longitudinal bending proof material, a longitudinal beam material, and a lateral beams material for dismounting. CONSTITUTION:After equipment on a deck structure D is removed, in a second process, a main plate 1 on both sides of a portion in the vicinity of each of a longtitudinal bending preventing material 2 and a longitudinal partition wall structure L is cut therealong and, for example, in a region equivalent to one tank. In a third process, the portion, located in the vicinity of each of a lateral beam material 3 and a lateral partition wall structure T, of the main plate 1 is cut. In a fourth process, out of an aggregate, remaining in a lattice shape, both end parts of the lateral bending preventing preventing material 2 between the lateral beam materials 3 and 3 or the lateral partition wall structure T are cut for dismounting. In a fifth process, the lateral beams material 3 between a side outer plate structure H and the longitudinal partition wall L and the lateral material 3 between the left gunwale longitudinal partition wall L and the right gunwale longitudinal partition wall L are cut for dismounting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for dismantling a ship, and more particularly to a method for dismantling at least the parallel hull portion of a ship to be scrapped.

(Prior Art) Recently, in order to cope with the surplus of ships, many ships such as oil tankers are being dismantled and scrapped. When scrapping a ship, the profitability of scrapping the ship depends on how much rolled iron material (reinforcing rod material) that is approximately 1.5 m x 3.5 m in size can be produced.

Conventionally, when dismantling a ship, the method was completely opposite to that used when building a ship.

In other words, each of the deck structure, bulkhead structure, and shell structure of the hull is divided into block structures each having a weight of IQton,
The block structure is transported by a crane to a predetermined dismantling stage, where the longitudinal stiffeners and crossbeam members are separated using a manual gas cutting machine and dismantled from the main plate.
Next, a method was adopted in which the longitudinal walls and crossbeams were dismantled to make rolled iron, while the main plate was dismantled to make rolled iron.

(Problems to be Solved by the Invention) In the above-mentioned conventional method of dismantling a ship, it is necessary to first divide it into block structures with a weight of IQton and transport them to the dismantling stage, which requires a large crane. Therefore, it must be dismantled in a dock or on a quay with crane equipment, and the cost of using a crane for dismantling becomes extremely expensive.If the structure is divided into block structures, the size and shape of the structure will be very high. , since the posture is not constant, it becomes difficult to save labor by using equipment for cutting and dismantling.
There are problems such as low productivity and a low recovery rate for the steel strips because they have to be dismantled exclusively using a manual gas cutting machine.

(Means for Solving the Problems) The method for dismantling a ship according to the present invention provides a method for dismantling each of the deck structure, bulkhead structure, and side shell structure when dismantling the parallel parts of the ship. , cut and dismantle the main plate in the area surrounded by the longitudinal members in the longitudinal direction and the transverse members perpendicular to it, then cut and dismantle the longitudinal stiffeners and stringer members, and then This involves cutting and dismantling the crossbeam materials.

(Function) In the method for dismantling a ship according to the present invention, the main plate in the area surrounded by the longitudinal members and the horizontal members is first cut and dismantled, so that the posture, size, etc. of the main plate meet certain conditions. By applying a multi-torch type automatic parallel cutting machine, etc., the main plate can be disassembled into expanded steel materials of a certain shape and maximum dimensions.

Next, the plurality of longitudinal stiffeners can be dismantled into small members using a predetermined cutting device under certain conditions regarding their posture, size, spacing, etc. However, the conditions are slightly different for longitudinal girder materials.

Next, since the posture, size, etc. of the plurality of cross beam members are constant, they can be sequentially disassembled into small members in a predetermined procedure using the same type of cutting device.

(Effects of the Invention) According to the method for dismantling a ship according to the present invention, as explained above, the main plate, longitudinal stiffeners, longitudinal beam members, and cross beam members are directly dismantled into small members from the ship's hull. Therefore, only a small crane, etc. is required, which reduces crane usage costs and eases restrictions on the demolition site.There is no need to set up a wide demolition stage outside the hull, and the main plate, longitudinal stiffeners, and crossbeams can be easily removed. Since each piece can be cut under the same conditions such as fixed posture, direction, pinch, and cutting length, it is possible to disassemble efficiently at low cost by applying automatic or semi-automatic cutting equipment. Since the above-mentioned members can be cut with the highest yield under the same conditions, the recovery rate of the drawn iron material can be significantly improved.

(Example) Hereinafter, an example of the ship breaking method according to the present invention will be described based on the drawings.

Figure 1 shows a part of the hull parallel part SP of an oil tanker to be dismantled and scrapped. It is composed of a bulkhead structure T (see FIG. 3) and a deck structure, and each of the above structures basically consists of a main plate 1, longitudinal stiffeners 2, and transverse beams 3.

When dismantling the parallel hull section SP, the main steps are to dismantle the deck structure D, side shell structure H, and vertical bulkhead structure, followed by the transverse bulkhead structure T and bottom structure B.

Next, Figure 2~ shows how to dismantle the above deck structure.
This will be explained in detail in Figure 5, but Figure 2 (al~(dl)
and FIG. 3 (al to (dl) respectively indicate the corresponding states.

First, in the first step, sacrificial items such as piping systems installed on the deck structure are removed, and the
The top surface of the deck structure is completely emptied as shown in Figure (, 1).

In the second step, a self-propelled parallel cutting device 4 having a plurality of cutting torches 4a as shown in FIG.
A pair of torches 4a each
After setting the distance between the torches 4a so that the longitudinal stiffeners 2, the longitudinal girder members 2A, and the main plates l on both sides of the longitudinal bulkhead structure can be cut, the cutting device 4 is made to run on its own. Then, as shown in FIG. 4, the main plates 1 on both sides of the longitudinal stiffeners 2, the longitudinal girder members 2A, and the longitudinal bulkhead structure are cut along these lines, for example, in an area corresponding to one tank.

In the third step, a self-propelled parallel cutting device 5 having at least one pair of cutting torches 5a as shown in No. 5M is set so as to be movable in the width direction of the ship, and each torch 5a is used to
After setting the distance between the torches 5a so as to cut the main plate 1 in the vicinity of the main plate 1, the cutting device 5 is made to run on its own to cut the main plate 1 in the vicinity of the crossbeam material 2 and the transverse bulkhead structure T as shown in FIG. main plate 1
cut.

Since the torch 5a is shifted backward in the direction of self-propelled movement relative to the carriage 5b and guide wheel 5C of the cutting device 5, the four sides of the main plate 1 are cut, and the dismantled parts of the main plate 1 fall downward. However, the cutting device 5 will not fall.

By the above-mentioned second and third steps, the rectangular main plate 1 in the area surrounded by the longitudinal stiffeners 2, the longitudinal beam members 2A, the vertical bulkhead structure, the cross beam members 3, and the horizontal bulkhead structure T is divided. Fall downwards.

The state in which the main plate 1 is divided in this way is shown in FIG. 2 (bl) and FIG. 3 (b), and in FIG. 3 (bl), the shaded area indicates the disassembled portion.

When the main plate 1 of the above-mentioned deck structure is dismantled, the main plates 1 on both the port and starboard side portions are left undismantled and used for transportation by workers and cutting equipment.

In the fourth step, among the bone members remaining in a grid pattern,
Longitudinal stiffeners 2 between the transverse beam members 2 and the transverse bulkhead structure T
Cut off both ends and dismantle.

This longitudinal stiffener 2 may be cut with a manual portable cutting torch by moving on a scaffold placed on the uncut stiffener 2, or a semi-automatic portable cutting torch tool may be used to cut the longitudinal stiffener 2. It may be set on the crossbeam material 3 near the beam 2 and cut semi-automatically, or a concave cutting device installed between the decks on both port and starboard sides may be used to cut the beam at a predetermined interval. The ends of the plurality of stiffeners 2 may be cut at intervals using a plurality of cutting torches mounted vertically movably.

The state in which the longitudinal stiffener 2 is cut as described above is shown in Figure 2 (
C) and as shown in Figure 3 (C). In FIG. 3, the shaded area indicates the dismantled portion.

In the fifth step, the cross beam material 3 between the side skin structure H and the longitudinal bulkhead and the cross beam material 3 between the port longitudinal bulkhead and the starboard longitudinal bulkhead are cut and dismantled.

When cutting this cross beam member 3, use a semi-automatic portable cutting torch tool in the same way as when cutting the stiffener 2, and attach a guide rod for the torch guide to the web of the cross member member 3 or the longitudinal bulkhead using a permanent magnet. The guide rod is used to guide the cutting torch while cutting.

However, a cutting torch that can move widely in the vertical direction is attached to the beam of the cutting device on both the port and starboard sides used to cut the stiffener 2, and the crossbeam material 3 is automatically cut with that torch. It is also possible.

The cut state of the cross beam material 3 is as shown in Fig. 2+dl and Fig. 3 (dl).

7 After dismantling the deck structure as described above, the side skin structure H and the longitudinal bulkhead structure are dismantled. In this case, a cutting device similar to that shown in FIG. The main plate 1 is cut in the same manner as described above using a cutting device that automatically moves along the longitudinal bulkhead structure.

In this case, if the cutting torch 6a in FIG. 6 is tilted,
The main plate 1 after division falls to the outside, and when the main plate 1 is tilted like the cutting torch 6b, the main body 1 after division falls to the inside.

The cutting of both ends of the main plate 1, the longitudinal stiffeners 2, and the cross beam members 3 can be carried out using substantially the same techniques as in the case of the deck structure, so the explanation thereof will be omitted.

Furthermore, after dismantling the side skin structure H and the longitudinal bulkhead structure, the transverse bulkhead structure T is also dismantled in the same manner.

Finally, regarding the dismantling of the bottom structure B, since the stiffeners 2 and the crossbeams 3 protrude from the top side of the main plate 1, it may be dismantled using an appropriate dismantling method, or the bottom structure can be disassembled using a crane. It is also possible to use the above-mentioned deck structure disassembly method by cutting into appropriate blocks and turning them over.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a perspective view of the parallel part of the hull of a ship, and FIGS. Figure 3 (
a) to (dl) are plan views of the deck structure at each stage of dismantling the deck structure, Figure 4 is a sectional view showing the main plate of the deck structure being cut in the ship's direction, and Figure 5 is the same. (A cross-sectional view showing the main plate being cut in the ship width direction. Figure 6 is a cross-sectional view showing the main plate of the side skin structure being cut in the ship length direction. sp... Hull parallel part; D...Deck structure, L...Vertical bulkhead structure, T...Horizontal bulkhead structure, H...Side shell structure,
1. Main plate, 2. Longitudinal stiffener, 2A. Longitudinal girder,
3. Cross beam material. Patent applicant Kawasaki Heavy Industries, Ltd. Figure 2

Claims (1)

[Claims] (1) When dismantling at least the parallel hull section of a ship, each of the deck structure, bulkhead structure, and side shell structure should be
The main plate in the area surrounded by the longitudinal members in the longitudinal direction and the transverse members perpendicular to it is cut and dismantled, then the longitudinal stiffeners and stringer members are cut and dismantled, and then the transverse members are cut and dismantled. A ship dismantling method characterized by cutting and dismantling girders.