JP2010526706A - Ship with tunnel-type bottom working space for welding - Google Patents

Abstract

Provided is a ship in which a joint portion of a separately constructed hull portion that needs to be welded is not immersed in water at the time of launch, and all welding operations for joining the separately constructed hull portions can be performed on the water surface. To do.
The ship of the present invention is a ship having a hull part that is constructed by dividing the hull, and the hull forms a welded part and a bottom working space for welding when the joined part is welded. And the step has a height that allows the coupling portion to be positioned on the water surface when each of the hull parts is launched. Furthermore, the bottom working space has a flat ceiling.
[Selection] Figure 3

Description

  The present invention relates to a ship that is constructed by dividing a hull part and then combining the divided hull parts. More specifically, the present invention relates to a ship that is connected to the divided hull part that requires welding. The present invention relates to a ship having a tunnel-type bottom working space for welding having such a height as to be located at the bottom.

  In general, a ship is much larger than a general building, has a complicated process, and goes through a process of assembling many members and equipment.

  Therefore, in recent years, most large ships are built at docks. A dock is a facility built in a shipyard or harbor to build and repair a ship.

  The dock is roughly divided into a dry dock and a floating dock. The dry dock is located near the sea where the water depth is sufficient, and is constructed by digging the soil to a length, width and depth that allows the vessel to enter and exit, and the side walls and bottom surface are made of reinforced concrete or steel sheet piles. Reinforcement and a dock gate at the entrance.

  The floating dock is a steel box with a substantially U-shaped cross section and has many water tanks. The buoyancy is adjusted by adjusting the amount of seawater stored in such a water tank.

  On the other hand, a large building such as a ship is constructed for each block unlike a car due to the size limit of the dock. That is, when building a ship, first, a plurality of individual small blocks are prepared (in the case of a large crude oil tanker having a cargo weight of 300,000 tons, it is divided into about 200 blocks). These small blocks are collected and assembled to make a larger mounting block. Then, these mounted blocks are assembled in the dock to complete the ship.

  However, ultra-large vessels, such as heavy-duty carriers and ultra-large crude oil tankers, that have recently increased in demand, assemble blocks in existing limited-sized docks to complete the entire ship building process. Has its limits.

  FIG. 1 is a front view of a ship showing a conventional ship building method for building a super-large ship by combining hull parts that are divided into a right side and a left side.

  FIG. 2 is a top view of a ship showing a conventional shipbuilding method for building a super-large ship by combining hull parts that are divided into a right side and a left side.

  As shown in FIG. 1 and FIG. 2, a construction method is used in which left and right hull parts constructed and completed at different docks are combined in a floating state after being launched. Such a method not only can overcome the size limit of the dock when constructing a super-large ship, but also can increase the productivity of the super-large ship through shortening the use period of the dock and improving the operation rate of the dock.

  At this time, in order to finally complete the ship, the joint portions C1 of the left and right hull parts must be welded together.

  However, when the left and right hull parts are launched for welding, as shown in FIG. 1, a part of the coupling site C1 of the left and right hull parts is located below the flood line (WL). Soaked in water.

  Therefore, in order to join the left and right hull parts, there arises an operational problem that welding must be performed in seawater.

  For reference, the principle of underwater welding is that the heat of the electric arc melts the base material and covers the part where the solvent is welded, which is the same as in land welding. Appropriate DC power supply, cable, circuit breaker, welding rod holder, ground clamp, welding rod are required for underwater welding, one cable is connected to the negative side of the DC power supply and the other is connected to the positive side And connected to a welding rod holder or a grounding clamp via a circuit breaker.

  If the welding rod on the clamp comes into contact with the base material, an arc of 6,000 ° C to 10,000 ° C is generated, and the heat of the arc simultaneously melts the end of the welding rod and the surrounding base material, and the welding rod The metal melted from the metal moves along the arc flow to the base metal under the influence of gravity, electricity, electromagnetics, gas diffusion, surface tension, etc., and is welded.

  However, the majority of welds made according to underwater welding procedures are of poor quality. This is because when the metal and the arc are completely surrounded by water, many bubbles are generated around the arc, and the hydrogen gas present in the bubbles is absorbed by the molten weld metal and welded. This is to cause cracks in the part.

  In addition, underwater welding work is more difficult to perform than land welding, and there is a problem that it is a heavy burden in terms of safety and cost, apart from the quality of welding.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to prevent the joint part of the hull part, which is independently divided and constructed, from being immersed in water at the time of launch, and to perform the welding operation of the joint part of the hull part. It is to provide a ship that can be executed on the surface of the water.

  In order to achieve the above object, according to one aspect of the present invention, the present invention is a ship having a hull portion constructed by being divided from each other, wherein the hull portion is welded with a joint portion and a joint portion. A step for forming a bottom working space for welding when welded, the step allowing the coupling part to be positioned on the water surface when each of the hull parts is launched A ship having a height is provided.

It is a front view of the ship which shows the method of building the conventional ship which couple | bonds the hull part divided | segmented into the left side and the right side. It is a top view of the ship which shows the method of building the conventional ship which couple | bonds the hull part divided | segmented into the left side and the right side. 1 is a front view showing a ship formed with a tunnel-type bottom working space for welding according to the present invention; FIG. FIG. 4 is a top view showing a ship in which a tunnel-type bottom working space for welding shown in FIG. 3 is formed.

  Hereinafter, an embodiment of a ship having a bottom working space for welding according to the present invention will be described with reference to the accompanying drawings.

  As described above, the tunnel-type bottom working space for welding according to the present invention includes a heavy-duty carrier, an ultra-large crude oil tanker (ULCC), a floating production storage shipping facility (FPSO), and a floating barge. Formed on very large sized vessels that are limited in size.

  For reference, the heavy-duty carrier is a vessel that specially carries cargo that is large in size and weight and cannot be carried by general cargo vessels, and that is equipped with a large crane.

  FIG. 3 is a front view showing a ship in which a tunnel-type bottom working space for welding is formed according to the present invention.

  FIG. 4 is a top view showing a ship in which a tunnel-type bottom working space for welding shown in FIG. 3 is formed.

  Referring to FIGS. 3 and 4, the ship according to the present invention independently divides the left hull portion 1 and the right hull portion 2 and welds the connecting portion C2 of the left hull portion 1 and the right hull portion 2. By doing so, the construction of the ship is finally completed.

  At this time, in the ship according to the present invention, a tunnel-type bottom working space 10 for welding is formed below the joint portion C2 of the hull parts 1 and 2. The bottom working space 10 allows the welder to approach the bottom surface of the coupling site C2. Since there is the bottom working space 10, unlike the conventional ship, the coupling site C <b> 2 that requires welding is positioned above the floodline (WL).

  Therefore, it is possible to avoid underwater welding work when welding the joint portion C2 located on the bottom of the ship. The hull parts 1 and 2 are structures suitable for ships including heavy material carriers, ultra large crude oil tankers (ULCCs), floating production storage and shipping equipment (FPSO), and floating barges.

  Moreover, as shown in FIG. 3, the upper surface 10a of the tunnel-type bottom working space 10 is formed flat, and the welding work of the bottom of the coupling site C2 is facilitated.

  The bottom working space 10 has a sufficient height H so that when the hull parts 1 and 2 are launched, a water-free welding space having an effective height AH is secured.

  The height H of the tunnel-type bottom working space 10 can vary depending on the size and application of the ship to be constructed. As shown in FIG. 4, the length L of the tunnel-type bottom working space 10 is the length of the joint portion C2 that would have been welded in an underwater welding operation if the tunnel-type bottom working space 10 did not exist. Determined by.

  The bottom working space 10 has a substantially trapezoidal cross-sectional shape in the illustrated embodiment.

  And, the cross-sectional shape of the tunnel-type bottom working space 10 has other cross sections corresponding to the use of the ship and the required speed of the ship as long as a water-free welding space having an effective height AH is secured. You may have a shape.

  Furthermore, the reduction of the lateral strength due to the formation of the tunnel-type bottom working space 10 can be overcome by reinforcing the lateral special ribs and the transverse bulkhead.

  As described above, a ship having a tunnel-type bottom working space for welding according to the present invention has a connection part of each hull part 1, 2 when welding the hull parts 1, 2 constructed separately. By positioning on the water surface, it is possible to eliminate the need to perform underwater welding work, improve the quality of welding and the safety of the welder, and reduce the welding cost.

Claims (4)

A ship having a hull part constructed in a divided manner,
The hull portion includes a joining portion to be welded and a step portion for forming a bottom working space for welding when the joining portion is welded, and each of the hull portions is launched by the step portion. A ship having a height at which the binding site can be positioned on the surface of the water.   2. The ship according to claim 1, wherein the hull portion is a structure suitable for building a ship including a heavy material carrier ship, a super large crude oil tanker, a floating production storage and shipping facility, and a floating barge.   The ship according to claim 1, wherein the bottom working space has a flat ceiling.   The ship according to claim 1, wherein the bottom working space has a substantially trapezoidal cross-sectional shape.

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