JPS582107B2 - Hull dismantling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dismantling ship hulls, particularly large ship hulls.

A large amount of high-grade metal material is used in the hull of the ship, and when the ship is scrapped, it is disassembled and small pieces of metal material (salary material,
It is commercialized as plate material, shaped steel) or sold as scrap material.

The conventional method for dismantling a ship's hull is to cut the above-the-water part of the ship's hull into large chunks (generally referred to as large chunks), and then use an offshore crane or an overhanging crane to remove these chunks. They are then hoisted up, lined up on land, and cut into small pieces (generally called small pieces).

Once the parts above the water surface have been dismantled, the parts that are below the water surface go into shallow water, wait for the tide to come, and then the hull that has appeared above the water surface is dismantled in the same manner as described above, and then the small part is dismantled. Perform a barashi.

In the case of the conventional ship dismantling method, it is necessary to have a place to moor the ship, shallow water, and a quay for arranging the dismantled products, and the demolition work cannot be carried out anywhere.

Another problem is that since the large and small parts are separated from each other, they must be transported by crane, and the man-hours required for this amount to 30% of the total demolition work.

Furthermore, since the demolition work area is divided into multiple locations, there is a problem in that a large number of workers are required.

Due to these circumstances, conventional construction methods were severely restricted in terms of demolition sites and required a large number of personnel, making the resulting scraps and ready-to-use metal materials expensive.

The present invention was achieved in order to eliminate the drawbacks of the prior art described above, and provides a ship hull dismantling method that is not subject to space restrictions and that allows for efficient dismantling.

In order to achieve the above object, the present invention includes a step of levitating either the bow or the stern using a buoyant body, a step of locating a buoyant offshore factory below the floating portion, and a step of reducing the length of the hull. A ship hull characterized by comprising a step of cutting the ship to shorten it, and a step of pulling the hull into the shipyard using a winch or carrier roller when moving the position between the shipboard and the shipyard. It is a demolition method.

Embodiments of the present invention will be described below with reference to the drawings.

First, the hull 1 to be dismantled is moored at a suitable location on the sea, and then the buoyancy body 2 is inserted under the direction where disassembly is to be started, for example, the bow 1a, to float the bow 1a.

Next, the offshore factory 3 is positioned below the bow 1a, and the dismantling work proceeds.

The conventional fusing method is mainly used for this demolition work.

The dismantling work continues until products or scrap materials are obtained at this offshore factory 3, but even in this case, large and small pieces are disassembled, or small pieces are directly disassembled, and then the product is processed using a press or cutting machine in the factory. It is better to proceed to

The dismantling work is preferably carried out in the order of arrows A→B→C, for example.

In other words, as with the conventional demolition method, first all of the floating parts of the hull are dismantled, then the entire submerged parts are brought to the surface.
This method is essentially different from the method of dismantling the entire part, and is characterized in that it is dismantled in the longitudinal direction of the ship, or in a direction that shortens its length.

For dismantling, a mechanized and automated dismantling device 10 is used.

FIG. 2 shows a state in which the first stage of dismantling has been completed, with the offshore factory 3 being removed from the hull 1 and the buoyancy body 2 that was on the bottom of the ship being removed.

Next, as shown in Figure 3, the ship 1 is reversed, the buoyant body 2 is inserted into the stern 1b side to float the stern 1b, the offshore factory 3 is inserted below it, and the dismantling work is carried out in the same manner as above. Let's proceed.

As the dismantling work progresses, the hull 1 must be pulled into the offshore factory 3, and the present invention particularly employs the following method.

As shown in Fig. 1, a pulley 4 is fixed to the hull 1, and a wire 6 is stretched between it and a winch 5 installed in the vertical part of the offshore factory. This causes a movement and eventually draws the hull 1 in the direction of the arrow,
Proceed with the work in this state.

At this time, the carrier roller 9 is driven to facilitate the drawing of the hull 1.

Since the offshore factory 3 bears part of the load of the hull 1,
Equipped with special load-bearing equipment.

Reference numeral 7 denotes a support plate, which has a pneumatic cushion 8 below it and a long roller 9 above it to disperse and receive the load of the hull 1 and to facilitate the movement of the offshore factory 3 relative to the hull 1. are doing.

The offshore factory 3 forms a kind of purge, and is U-shaped when viewed from the front, with cranes constituting the demolition equipment 10, power, and a set of equipment necessary for demolition work mounted on both sides.

Figure 4 shows the situation where the dismantling work has progressed further.
c are dismantled in the vertical direction, and then pulled toward the offshore factory 3 in the direction of the arrow using the winch 5 and carrier roller 9, and are dismantled one after another.

The present invention uses a buoyant body 2 to tilt the hull 1, float the bow or stern, locate the offshore factory 3 on this floating part, and relatively move the hull so as to draw the hull into the floating factory 3. Since we are proceeding with the demolition by moving it to

(b) Since the hull to be dismantled is floated on the sea and the dismantling work is carried out as is, there are almost no restrictions due to location.

In particular, demolition can be carried out in areas other than ports, such as in the shadows of islands or in shallow waters.

(Example) Since the hull 1 is pulled into the offshore factory 3 using a winch or rollers as in the previous embodiment, the dismantling work can be carried out extremely smoothly.

In particular, the construction method of tilting the hull 1 has the feature that the offshore factory 3 can be easily placed under the hull 1, and both the buoyant body 2 and the marine factory 3 can obtain the buoyancy necessary for tilting the hull.

(c) In the conventional construction method, a lot of work was required to transport the large chunks with a crane, but in the present invention, such work can be completely omitted.

(d) Furthermore, in the present invention, the end of the hull is placed on a buoyant offshore factory, and while the hull is being pulled into the offshore factory, the pulled-in portion is cut and the hull is dismantled. The preparation process for dismantling is not as complicated as in the past.

Therefore, from this point of view as well, the working time can be significantly shortened.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures show an embodiment of the present invention, and Fig. 1 shows a state in which the bow is floated by a buoyant body and an offshore factory is located at that position, and Fig. 2 shows the bow of the ship. Figure 3 is a diagram showing the stern of the ship being lifted up by a buoyant body and the offshore factory is located at that location. Figure 4 is a diagram showing the state of work during dismantling of the final part. be. 1...hull, 1a...bow, 1b...stern, 1c...center, 2...buoyancy body, 3...maritime factory, 4...pulley, 5
... winch, 6 ... wire, 7 ... support plate, 8 ... pneumatic cushion, 9 ... carrier roller, 10 ... demolition device.

Claims (1)

[Claims] 1. The process of levitating either the bow or the stern using a buoyant body, the process of locating a buoyant offshore factory below this floating part, the process of cutting the hull to shorten its length, and A method for dismantling a ship's hull, which comprises the step of pulling the hull into the ship's factory using a winch or a carrier roller when moving the ship between the factory and the ship's factory.