KR20110049500A - Tandem construction method using bubble - Google Patents

Abstract

PURPOSE: A tandem construction method using bubbles is provided to reduce the buoyancy of a hull by generating bubbles on the surface of the hull. CONSTITUTION: A tandem construction method using bubbles is as follows. Ship blocks are built in a dock. Before the ship is floated, main facilities are built in the ship. When the built ship is floated, bubbles are supplied to the hull part of the ship by reducing the buoyancy of the ship. After the floated ship is towed to the outside the dock, a dock gate is closed, and the residual parts of the ship are built at the same position.

Description

Tandem construction method using bubble

The present invention relates to a tandem method using a bubble, and in detail, the seawater flowing in the state that is loaded on the ship under construction when the ship is moved out of the dock is completed drying first in the dock according to the tandem drying method After supplying bubbles to the lower surface of the hull in contact with the buoy to reduce buoyancy so that the hull is not buoyed, the tandem drying method is to be launched after completion of the drying at the same position when the launching ship goes out of the dock.

The tandem drying method of the ship's drying method is a drying method that can simultaneously build two to four vessels in one dock by using the free space of the dock. In this tandem method, when a ship is completed by lifting the completed ship, the partially completed ship is also required to float after the floatation, and the water is drained again after moving to the rest of the ship construction work in the moved position.

However, the problem of the conventional tandem method is that the ship's floating draft (DRAFT, maximum 7.1) when the tandem zone is 55% less than the LOA due to the limitations of the dock specifications. In order to secure M), it is necessary to lift the ship by limiting the loading capacity of the tandem ship, and after the flotation, there is a problem that excessive required air flow due to process disruption and stone work due to lack of dry air in the dock occurs.

The unloaded quantity before flotation according to the tandem drying method is main engine, tail and intermediate shaft, stern block, lashing bridge, hatch cover, etc. to be.

The problem of drying in the dock after the flotation is due to the unloading is that the tail house (DECK HOUSE) is mounted according to the tail and intermediate shaft mounting and the main engine (M / E) after the flotation. Problem with the power supply failure of the land)

After flotation, there is a problem that propeller and rudder installation air is insufficient due to stern block mounting.

As a tandem method that solves the problems of the tandem method by the conventional flotation method, there is a patent application No. 10-2006-137604 (name: immersion method applied to the tandem drying method) of the present applicant.

This prior art is the main engine (MAIN ENGINE), tail and intermediate shaft (TAIL & INTERMEDIATE SHAFT), stern block (LASHING BRIDGE) and hatch cover ( After loading all HATCH COVER), tandem ships are submerged without flotation. When the floated ship goes out of the dock, it is continuously dried at the same location to shorten the ship's drying air within the dock. Tandem method using the method.

Hereinafter, a tandem method using a conventional immersion method will be described with reference to the accompanying drawings.

6 is a flowchart of a tandem drying method to which the conventional immersion method is applied. As shown, a tandem drying method using a conventional immersion method comprises the steps of drying the ship block in accordance with the general tandem drying method in the dock; Thereafter, the main installation on the submerged vessel before the flotation of the launching ship in the dock and drying; Thereafter, inflowing water into the dock to infuse the launching vessel, inflowing water into the cargo / hold ballast (C / HOLD BALLAST) and some double bottom tanks (DOUBLE BOTTOM TANK) on the tandem vessel and submerging the vessel at the same location; After the lifted launch ship is towed out of the dock by the tugboat, the dock gate is closed, and then the remaining ships are constructed in the same position. In the step of installing and installing the main loads installed on the submerged vessel, the main loads are main engine (MAIN ENGINE), tail and middle shaft (TAIL & INTERMEDIATE SHAFT), stern block (AFT BLOCK), lashing bridge (LASHING). BRIDGE, HATCH COVETR, etc., select one or more of these major payloads.

Figure 7 is an exemplary view showing the invariant position in the dock (dock) of the immersion target ship during drying in accordance with the tandem drying method to which the conventional immersion method is applied, the main engine, tail and intermediate shaft ( You can see that TAIL & INTERMEDIATE SHAFT and AFT BLOCK are installed. After the flotation, it can be seen that shipbuilding was completed at the same location without any change in the ship's position.

8 is an exemplary view comparing the amount of loading during flotation according to the application of the conventional immersion method, as shown in the conventional tandem drying method, the main mounting is the main engine (MAIN ENGINE), tail and intermediate shaft (TAIL & It can be seen that INTERMEDIATE SHAFT, AFT BLOCK, LASHING BRIDGE, and HATCH COVETR are not installed, and main engine (MAIN ENGINE), which is the main mounting material, is used in the conventional tandem drying method with immersion method. TAIL & INTERMEDIATE SHAFT is installed at the bottom, AFT BLOCK is mounted at the top of the rudder, LASHING BRIDGE, HATCH COVETR. ) Can be seen mounted on top of the vessel. That is, in the tandem drying method using the conventional immersion method, unlike the conventional tandem drying method, it can be seen that the main mountings are mounted for each block forming the vessel.

As described above, the tandon drying method using the conventional immersion method, if the tandem zone (TANDEM ZONE) meets the following conditions less than 55% of the total length (LOA) due to constraints of the dock specifications, the launch ship Before loading the tandem vessels, the cargo load and C / HOLD BALLAST and some double bottom tanks (DOUBLE BOTTOM TANK) are naturally flooded so that the launching vessel does not become injured when floating in the dock. After paying off, the tandem ship's DOCK dry air will be secured for about eight days.

However, the tandem drying method using the conventional immersion method as described above, despite the many advantages, can be applied only when the tandem zone (TANDEM ZONE) is less than 55%, and the workable area in launching the engine room and stern hold (Hold) There are disadvantages such as limitations.

An object of the present invention for solving the above problems is to generate a bubble on the hull surface of the vessel in operation when the ship is dried by the tandem drying method to reduce the buoyancy of the hull due to the inflow of sea water It is to provide a tandem drying method that allows to continue to dry in the same position without support.

The present invention to achieve the object as described above and to perform the problem to eliminate the conventional drawbacks A) drying the ship block in the dock; B) thereafter installing the main loads on the ship under construction before flotation of the launching ship in the dock and drying the ship; C) thereafter supplying a bubble to the hull portion in contact with the sea water flowing into the dock at the same location without the flotation to reduce the buoyancy of the ship being dried by the buoyancy of the previously launched launch ship; D) A launch ship is towed out of the dock, and when the dock gate is closed, it is achieved by providing a tandem drying method using a bubble, characterized in that it comprises the step of drying the remainder of the ship being built at the same location.

In the step B), the main load is any one of a main engine, a tail and an intermediate shaft, a tail block, a lashing bridge, a hatch cover, and a hatch cover. It is characterized by the above.

Step C) includes an air supply unit installed outside the dock; An air supply line which is supplied from the air supply unit and installed at least one at a dock bottom according to the size of the ship; It is characterized in that the step of generating a bubble having a means consisting of a plurality of bubble generating tube is installed in a separate air supply line to discharge the air.

The bubble generating tube is installed to have a different angle from the adjacent bubble generating tube for adjusting the angle at which air is discharged, characterized in that to discharge the bubble.

The bubble generating tube is characterized in that the bubble is formed by forming an individual bubble generating tube in a multi-tube having a plurality of angles for adjusting the angle at which air is discharged.

In the step C), the bubble is generated only in a space in which the ship block is being built by placing a boundary between the space in which the launch ship in the dry dock is disposed and the space in which the ship block is being built.

The present invention as described above can be equipped with a deck house (DEFT HOUSE) early flotation after the flotation shaft and main engine (SHAFT & MAIN ENGINE) of the launch ship in the tandem method to ensure the shore power (SHORE POWER) faucet air is secured With advantages,

In addition, the tandem method With the stern block mounted before flotation, FINAL SIGHTING is available, and the propeller and rudder installation air is secured.

In addition, due to the main payload installed after the launching of the launch ship in the tandem method, the main air is greatly shortened in the tandem method by releasing the load of the GOLIATH CRANE.

In addition, it is possible to work in all areas of launching,

In addition, since the ballast is not required in the tank / hold section, the preparation and filling time according to the ballast are reduced, and the man-hour of dewatering after deballast is reduced.

In addition, the type of ship can be applied to all types of wire and can be applied without tandem zone restrictions,

In addition, since the position before and after launching (F / T) is the same, it is a useful invention having the advantage of being applicable to each dock / batch (Dock / Batch) is an invention that is expected to be used in industry.

Hereinafter, the configuration and the operation of the embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a flow chart of the tandem drying method using the bubble generation of the present invention, as shown in the ship construction procedure according to the present invention A) drying the ship block in the dock; B) thereafter installing the main loads on the ship under construction before flotation of the launching ship in the dock and drying the ship; C) thereafter supplying a bubble to the hull portion in contact with the sea water flowing into the dock at the same location without the flotation to reduce the buoyancy of the ship being dried by the buoyancy of the previously launched launch ship; D) After launching the towing out of the dock, when the dock gate is closed, it consists of drying the rest of the ship being built at the same location.

In the step of installing and installing the main loads installed on the ship under construction, the main loads are MAIN ENGINE, TAIL & INTERMEDIATE SHAFT, AFT BLOCK, lashing bridge (LASHING). BRIDGE) and HATCH COVETR. Therefore, one or more of these major payloads may be selected and mounted.

2 is a bubble generation principle for reducing the buoyancy of the hull according to the invention. As shown, the present invention is shown a principle of reducing the buoyancy of the vessel so that when the seawater flows into the dock is not buoyed building.

That is, when a bubble (bubble) is generated on the surface of the ship in contact with the seawater introduced into the dock by forming a bubble (bubble) to form an air layer at the site where the ship and sea water contact, the air layer by the bubble is formed to buoyancy of the ship Will be reduced. When the buoyancy is reduced in this way, the weight of the vessel will overcome the buoyancy and cannot be lifted.

Therefore, the present invention is drastically dried by inflow of seawater into the inside of the ship under construction like the immersion method applied to the conventional tandem method, and after the launched ship goes out of the dock, draining the seawater drained in the ship again The schedule gets faster.

In more detail, look at the principle that the vessel is not supported when the bubble occurs.

The present invention uses the density difference between the air and the fluid, the principle is to reduce the buoyancy applied to the hull to prevent injury. In other words, when air is injected into seawater into the dock for launching, the air bubbles (membrane) are formed between the hull and the seawater as the bubbles (air bubbles) rise, preventing the buoyancy from increasing in the hull. That's the principle.

※ Density calculation of air and water

Ⓐ Air density calculation (assuming 0 ℃ and 1 atm, 79% nitrogen and 21% oxygen)

Air Average Molar Mass = (Nitrogen Molecular Mass * Nitrogen Volume Ratio) + (Nitrogen Molecular Mass * Nitrogen Volume Ratio)

                  = 28 * 0.79 + 32 * 0.21 = 28.84 g / mol

Air density = 28.84g / 22.4L = 1.29g / L

Ⓑ Seawater Density: 1g / ml → 1,000 g / L

Ⓒ density density of air and seawater: (1000g / L) / (1.29g / L) = 775.19

Ⓓ Sea water is therefore 775.19 times heavier than air

In addition, the present invention is not shown, but the ship in the construction that will not be buoyed by supplying the bubble is to proceed to the drying operation in the dock (dock) in a constant position, the main engine, tail and intermediate shaft (TAIL & INTERMEDIATE SHAFT), It will work with aft block, lashing bridge and hatch cover installed. In this case, it is the same as the conventional immersion method which is the applicant's pre-registration method.

Although the installation location of these main components is not shown, the main engine is installed in the engine room, the tail and middle shafts are installed at the bottom, and the stern block is at the top of the rudder. The LASHING BRIDGE and the HATCH COVETR are mounted on the upper part of the ship. That is, unlike the conventional tandem drying method, it can be seen that the main mountings are mounted to each block forming the vessel.

In addition, the present invention, unlike the tandem drying method using the conventional immersion method, because there is no restriction of the dock specification (DOCK) is made in the whole tandem zone (TANDEM ZONE), so the tandem using the conventional immersion method was possible only 55% or less than the total length (LOA) There is a significant advantage in drying space efficiency in the dock compared to the drying method.

3 is a block diagram of a bubble generating apparatus according to an embodiment of the present invention, Figure 4 is a cross-sectional view taken along the line A-A, B-B, C-C of FIG.

As shown, the present invention includes an air supply unit (1) composed of a compressed air generator such as a compressor on the outside of the dock to reduce the buoyancy of the ship; An air supply line (2) which is supplied from the air supply unit and installed at least one at a dock bottom according to the size of the ship; It is composed of a plurality of bubble generating pipe (3) installed in a separate air supply line to discharge the air.

The bubble generating tube is installed to have a different angle from the adjacent bubble generating tube for adjusting the angle of the air discharge, or formed in a multi-tube having a plurality of individual bubble generating tube.

In addition, the bubble generating tube is formed so that the ejection direction toward the ship, and is formed on the side close to the ship so that the bubble sticks to the ship as much as possible, the air layer (membrane) is formed as large as possible, and the buoyancy is reduced It is efficient to

The air layer formed by the bubbles formed in this way is formed on the surface in contact with the sea water in the lower part of the hull is evenly distributed in the stern, the middle part, the bow portion of the ship to reduce the buoyancy is shown in FIG.

5 is a planar view of a dry dock to which the bubble method according to the present invention is applied. As shown in FIG. 5, the bubble method according to the present invention may be applied anywhere in the dry dock, but not to be carried out in a space in which a launch ship is arranged. do. As shown in the illustrated drawings according to one embodiment, it should not be carried out in the vicinity of the launch ship disposed near the dock gate. The reason for this is that bubbles can hinder the launch ship's flotation. Accordingly, the bubble method of the present invention is disclosed in FIGS. 3 to 4 only in a space in which a ship block in partial drying is located at a boundary between a space in which a launching ship is disposed and a space in which a partial drying ship is being dried, based on the total area of the dry dock. Install a bubble generator to reduce the buoyancy of the ship to submerge.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 is a flow chart of the tandem drying method using the present invention bubble generation,

2 is a bubble generation principle for reducing the buoyancy of the hull according to the invention,

3 is a block diagram of a bubble generating apparatus according to an embodiment of the present invention,

4 is a cross-sectional view taken along the line A-A, line B-B, line C-C of FIG.

5 is a plan view of a dry dock to which the bubble method according to the invention is applied,

6 is a flowchart of a tandem drying method to which the conventional immersion method is applied,

Figure 7 is an exemplary view showing the invariant position in the dock (dock) of the immersion target ship during drying in accordance with the tandem drying method applied the conventional immersion method,

8 is an exemplary view comparing the amount of payload during flotation according to whether or not the conventional immersion method is applied.

<Description of the symbols for the main parts of the drawings>

(1): Air supply part (2): Air supply line

(3): foaming tube

Claims (6)

A) drying the ship block in the dock; B) thereafter installing the main loads on the ship under construction before flotation of the launching ship in the dock and drying the ship; C) thereafter supplying a bubble to the hull portion in contact with the sea water flowing into the dock at the same location without the flotation to reduce the buoyancy of the ship being dried by the buoyancy of the previously launched launch ship; D) Tandem drying method using a bubble, characterized in that after the towing ship is towed out of the dock, when the dock gate is closed, drying the rest of the ship being built at the same position. The method according to claim 1, In the step B), the main load is any one of a main engine, a tail and an intermediate shaft, a tail block, a lashing bridge, a hatch cover, and a hatch cover. Tandem drying method using a bubble, characterized in that above. The method according to claim 1, Step C) includes an air supply unit installed outside the dock; An air supply line which is supplied from the air supply unit and installed at least one at a dock bottom according to the size of the ship; Tandem drying method using a bubble, characterized in that the step of generating a bubble provided with a means consisting of a plurality of bubble generating pipe is installed in a separate air supply line to discharge the air. The method of claim 3, The bubble generating tube is a tandem drying method using a bubble, characterized in that the bubble is discharged by installing so as to have a different angle from the adjacent bubble generating tube for adjusting the angle of the air discharge. The method of claim 3, The bubble generating tube is a tandem drying method using a bubble, characterized in that the bubble is formed by forming an individual bubble generating tube in a multi-tube having a plurality of angles for adjusting the angle at which air is discharged. The method according to claim 1, Bubble generation in the step C) is a tandem drying method using a bubble, characterized in that the space between the space in which the ship is placed in the dry dock and the space in which the ship block is drying is generated only in the space in which the ship block is drying.

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