KR102856008B1 - Method on tandem of launching ship in dry-dock by using buoyancy structure-combined keel block having added buoyancy - Google Patents

Abstract

The present invention comprises a step of determining a keel joint for use as a buoyancy body (S110), a step of examining the influence on the hull in advance (S120), a step of arranging a keel joint for use as a buoyancy body and a dock (S130), a step of inspecting the lower part of the hull (S140), a step of attaching a keel joint for use as a buoyancy body and a dock (S150), a step of generating additional buoyancy (S160), a step of removing a keel joint for use as a buoyancy body and a dock (S170) for a fully built ship, a step of floating a ship (S180), a step of withdrawing a quay wall of a fully built ship (S190), and a step of withdrawing a dock gate of a partially built ship, and provides a keel joint for use as a buoyancy body and a dock (S200) attached to the lower part of the hull base line, which can perform the role of a keel joint during hull construction and provide additional buoyancy during floating. We are initiating a dry dock tandem launching method using a keel pelvis.

Description

Method on tandem launching ship in dry dock by using buoyancy structure-combined keel block having added buoyancy

The present invention relates to a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, which can provide complete and stable additional buoyancy regardless of the buoyancy draft of a partially built ship by attaching the keel pelvis combined with a buoyancy body to the lower part of the hull base line, and at the same time, can perform the role of a keel pelvis within a dry dock.

Generally, for efficient construction of large ships, the dry dock method (dry dock method) is used to construct ships. Ship blocks are built in the dry dock, seawater is introduced into the dry dock to float the ship, and it is lifted onto the quay wall and taken out.

Recently, a tandem method has been applied to simultaneously build a fully built ship (launched ship) and a partially built ship (partially launched ship) by utilizing the spare space within the dry dock.

For example, when applying the tandem method to a launching vessel for a very large container ship and a partially launched vessel for a VLCC, when seawater flows into the dry dock, the bulkhead of the partially launched vessel may tilt unevenly toward the stern end due to the buoyancy of the cargo tank area formed, and when the launching vessel is lifted by a tug vessel, the supporting beam of the partially launched vessel may collapse due to the screw rotation of the tug vessel, causing the partially launched vessel to capsize. Therefore, there is a limitation that the launching vessel for a very large container ship and the partially launched vessel cannot be built at the same time.

As a prior art to overcome such limitations, Korean Patent Publication No. 10-0681556 discloses a conventional ship's added buoyancy launching method and a device suitable therefor, as illustrated in FIG. 1, comprises a buoyancy chamber (1) configured to accommodate an object having buoyancy inside in the form of a steel cage of a predetermined size, a buoyancy body (2) accommodated in the buoyancy chamber (1) to generate buoyancy, and a plurality of fillers (3) that install the buoyancy chamber (1) on the bottom of the ship (S) and connect and fix the ship (S) and the buoyancy chamber (1) by a method such as welding so that the additional buoyancy acts on the ship in a balanced manner, thereby enabling the launching of short, partially built ships and large blocks that do not have a cargo space to fill with ballast.

However, there is a problem that the buoyancy body must be separated from the ship when further building a partially built ship after being withdrawn to the quay wall of a fully built ship by connecting the ship and the buoyancy chamber through a filler of a certain length, thereby complicating the construction process and lowering productivity.

Accordingly, a technology is required that can provide complete and stable additional buoyancy regardless of the buoyancy draft of a partially built ship by attaching a keel keel that doubles as a buoyancy body to the lower part of the hull base line, while also allowing it to function as a keel keel within a dry dock.

Korean Patent Publication No. 10-0681556 (Ship launching method using additional buoyancy and suitable device, February 9, 2007) Korean Patent Publication No. 10-0796410 (Submerged construction method applied to tandem construction method) Korean Patent Publication No. 2012-0107587 (Shipbuilding method for shortening quay wall air)

The technical problem to be achieved by the present invention is to provide a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, which can provide complete and stable additional buoyancy regardless of the buoyancy draft of a partially built ship by attaching the keel pelvis combined with a buoyancy body to the lower part of the hull base line, and at the same time, can perform the role of a keel pelvis in a dry dock.

In order to achieve the above-mentioned object, the present invention comprises the steps of: determining the size of a keel board that serves as a buoyancy body and a keel board and a fixing position on the lower part of the hull base line according to the weight and buoyancy of a partially built ship in a dry dock where a plurality of ship blocks of the same or different kinds are built in one or two rows; arranging the keel board that serves as a buoyancy body and a keel board in the dry dock before a keel-laying step of the partially built ship; inspecting the lower part of the hull of the partially built ship to which the keel board that serves as a buoyancy body is attached; attaching the keel board that serves as a buoyancy body to the lower part of the hull base line of the partially built ship; creating additional buoyancy by injecting or draining ballast water into the keel board that serves as a buoyancy body of the partially built ship when the fully built ship is launched; and buoying the fully built ship and the partially built ship by injecting water into the dry dock. The present invention provides a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, including the steps of: withdrawing the completely built ship from the dry dock to the quay wall; and withdrawing the partially built ship toward the dock gate of the dry dock, draining the ship into the dry dock, sinking the partially built ship into the dry dock, and performing remaining hull construction.

In addition, before the step of placing the keel pelvis combined with the buoyancy body in the dry dock, a step of preliminarily examining the influence of the keel pelvis combined with the buoyancy body on the hull of the partially built ship may be further included.

In addition, the keel pelvis for use as a buoyancy body is attached to the lower part of the hull base of the fully built ship, and a step of removing the keel pelvis for use as a buoyancy body from the fully built ship before the water is poured into the dry dock may be further included.

Here, the keel pelvis combined with the buoyancy body may include a connecting member fixed or separated from the lower part of the hull base line of the partially built ship or the fully built ship; and a buoyancy chamber connected to the connecting member and containing ballast water.

At this time, a step of forming a support that supports both ends of the lower part of the hull base line of the partially built ship or the fully built ship may be further included on both sides of the upper surface of the buoyancy chamber.

In addition, the above-mentioned connecting member may be arranged in a plurality of groups spaced apart from each other along the hull baseline of the partially built ship or the fully built ship or spaced apart at intervals in a diagonal direction, and may be formed in a cross-shaped shape with one upper surface fixed to the lower side of the hull baseline, and a cross-shaped stopper corresponding to the shape of the connecting member and having a margin may be formed by being recessed into the upper end of the buoyancy chamber.

In addition, the above-mentioned connecting member may be formed in a cross shape in which a plurality of connecting members are spaced apart along the hull baseline of the partially built ship or the fully built ship and an upper surface in one direction is fixed to the lower part of the hull baseline, and a cross-shaped stopper corresponding to the shape of the connecting member and having a margin may be formed by being recessed into the upper part of the buoyancy chamber.

Here, the stopper may be formed to have a clearance of 5% to 10% with respect to the connecting member.

In addition, the step of removing the keel pelvis combined with the buoyancy body from the fully built ship may be performed by completely pouring water into the keel pelvis combined with the buoyancy body of the fully built ship and then separating and removing the connecting member from the lower part of the hull baseline before the fully built ship is floated, or by separating the connecting member from the stopper and then withdrawing the fully built ship from the dry dock to the quay wall, and then separating and removing the connecting member from the lower part of the hull baseline at the quay wall.

In addition, the step of removing the keel pelvis combined with the buoyancy body from the fully built ship may be performed by completely pouring water into the keel pelvis combined with the buoyancy body of the fully built ship, separating the connecting member from the lower part of the hull baseline before the fully built ship floats, and then fixing the connecting member to the stopper or additionally pouring water into the connecting member so that the connecting member does not float by its own buoyancy.

In addition, the keel pelvis combined with the buoyancy body may include a buoyancy chamber that accommodates ballast water; and a half-timber structure that extends in the longitudinal direction and has a lower surface integrally fixed to the buoyancy chamber and an upper surface fixed or separated from the lower part of the hull base line of the partially built ship or the fully built ship.

Here, the step of removing the keel pelvis combined with the buoyancy body from the fully built ship can be performed by separating and removing the keel structure from the lower part of the hull base line before the fully built ship is floated after the keel pelvis combined with the buoyancy body of the fully built ship is completely filled with water.

According to the present invention, a keel pelvis that doubles as a buoyancy body can be attached to the lower part of the hull base line to provide complete and stable additional buoyancy regardless of the buoyancy draft of a partially built ship, and at the same time, it can perform the role of a keel pelvis within a dry dock.

In addition, according to the present invention, it can be applied universally regardless of the type of ship, and the amount of ballast for buoying the hull of a partially built ship can be reduced, and various loads can be loaded while satisfying the allowable draft and balance maintenance conditions.

In addition, according to the present invention, even if the weight of the engine room area increases due to additional equipment specifications of recent eco-friendly ships, sufficient buoyancy can be provided to a partially built ship with one hold or two holds to float it, thereby contributing to the efficiency and productivity of dock arrangement.

Figure 1 illustrates a ship's additional buoyancy launching method using conventional technology and a device suitable therefor.
Figure 2 is a flow chart illustrating a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy according to an embodiment of the present invention.
Fig. 3 illustrates a keel pelvis combined with a buoyancy body of the first embodiment of a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy of Fig. 2.
Figure 4 illustrates the joint structure of the buoyancy body-compatible keel pelvis and the hull of Figure 3.
Fig. 5 illustrates a keel pelvis combined with a buoyancy body of a second embodiment of a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy of Fig. 2.
Figure 6 illustrates the joint structure of the buoyancy body-compatible keel pelvis and the hull of Figure 5.
Fig. 7 illustrates the step of attaching a keel pelvis combined with a buoyancy body to the hull of a dry dock tandem launching method using a keel pelvis combined with a buoyancy body with additional buoyancy of Fig. 2.
Figures 8 and 9 illustrate the launching process according to the dry dock tandem launching method using the keel pelvis combined with the buoyancy body with additional buoyancy of Figure 2.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

The dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy according to an embodiment of the present invention comprises, in general, a keel pelvis combined with a buoyancy body determination step (S110), a hull influence preliminary review step (S120), a keel pelvis combined with a buoyancy body dock arrangement step (S130), a hull lower inspection step (S140), a keel pelvis combined with a buoyancy body hull attachment step (S150), an additional buoyancy generation step (S160), a keel pelvis combined with a buoyancy body removal step (S170) of a fully built ship, a ship floatation step (S180), a fully built ship quay wall withdrawal step (S190), and a partially built ship dock gate withdrawal step (S200), thereby building a plurality of ship blocks of the same or different kinds in one or two rows in the same dry dock. In the tandem launching method for simultaneously launching a fully built ship and a partially built ship (see Fig. 8), the keel keel (110, 120) that is attached to the lower part of the hull base line is designed to perform the role of a keel keel during hull construction and to provide additional buoyancy during floating.

Hereinafter, with reference to FIGS. 2 to 9, the dry dock tandem launching method using the keel pelvis combined with the buoyancy body having the aforementioned additional buoyancy will be described in detail as follows.

First, in the step of determining the keel pelvis for use as a buoyancy body (S110), the size of the keel pelvis for use as a buoyancy body (110, 120) that simultaneously performs the roles of a buoyancy body and a keel pelvis is determined, along with the attachment and fixing position relative to the lower part of the hull baseline, according to the weight and buoyancy of the partially built ship in the dry dock according to the production standard plan at the ship design stage.

Before manufacturing the keel pelvis (110, 120) for use as a buoyancy body, the size or weight of the keel pelvis (110, 120) for use as a buoyancy body and the fixing position below the hull baseline are determined in advance.

Subsequently, in the hull impact pre-examination stage (S120), the impact of the keel skeleton (110, 120) that doubles as a buoyancy body when the partially built ship is floated is pre-examined to simulate the hull stability according to the support strength for the hull as a keel skeleton by the keel skeleton (110, 120) that doubles as a buoyancy body of the previously determined specifications, and the hull balance according to the degree of buoyancy added as a buoyancy body, so as to determine in advance whether the keel skeleton can sufficiently perform its role as a keel skeleton during hull construction and its role as a buoyancy body when floated for launching.

Here, when the support strength or additional buoyancy by the buoyancy body-compatible keel pelvis (110, 120) is not satisfied, the size and hull fixing position of the buoyancy body-compatible keel pelvis (110, 120) can be readjusted and determined, and the feedback can be sent to the buoyancy body-compatible keel pelvis determination step (S110) (S121).

Subsequently, in the keel-laying step (S130) of the buoyancy body-compatible keel pelvis, as shown in (a) of Fig. 9, before the keel laying step of the partially built ship, the keel-laying step (110, 120) of the buoyancy body-compatible keel pelvis is placed and placed at a determined placement position within the dry dock.

Subsequently, in the lower hull inspection step (S140), the lower hull to which the buoyancy body-compatible keel pelvis (110, 120) is attached is inspected, and the connecting member (111) of the buoyancy body-compatible keel pelvis (110) of the first embodiment described later is also formed.

Meanwhile, as illustrated in FIGS. 3 and 4, the keel pelvis (110) of the first embodiment, which is also a buoyancy body, may be composed of a connecting member (111) whose upper surface is fixed or separated from the lower part of the hull base line of a partially built ship, and a buoyancy chamber (112) which is connected to the lower surface of the connecting member (111) and has an internal space formed to accommodate ballast water. Here, a plurality of filling spaces partitioned by bulkheads may be formed inside the buoyancy chamber (112), and seawater or fresh water ballast water may be injected or drained through an injection hole (not illustrated) formed on the side or upper surface of the buoyancy chamber (112) by a pump (not illustrated) and a drain hole (not illustrated) formed on the bottom surface of the buoyancy chamber (112), thereby generating an amount of additional buoyancy necessary for buoyancy according to the design criteria of the ship design stage.

Here, some or no ballast water may be injected into the filling space inside the buoyancy chamber (112) to generate the necessary amount of additional buoyancy for the floating of the partially dry ship.

For example, the connecting member (111) may be arranged in a plurality of groups spaced apart from each other along the hull baseline (see (a) of FIG. 3) or spaced apart at intervals in a diagonal direction (see (b) of FIG. 3) and formed in a cross shape with one upper surface fixed by welding to the lower side of the hull baseline, and a cross-shaped stopper (113) corresponding to the shape of the connecting member (111) and having a margin may be formed indented at the upper end of the buoyancy chamber (112), so that the connecting member (111) may be inserted and fixed into the cross-shaped stopper (113) to prevent the connecting member (111) from being detached or deformed in the XY direction, thereby stably supporting the connecting member (111) on the buoyancy chamber (112).

Here, only one side in the X-axis direction or only one side in the Y-axis direction of the upper surface of the cross-shaped connecting member (111) is welded and fixed to the lower part of the hull baseline, so that the connecting member (111) can be easily removed from the lower part of the hull baseline.

Alternatively, the connecting member (111) may be arranged in multiple numbers spaced apart along the hull baseline (see (c) of FIG. 3), formed in a cross shape with one upper surface fixed by welding to the lower side of the hull baseline, and a cross-shaped stopper (113) corresponding to the shape of the connecting member (111) and having a margin may be recessed and formed on the upper side of the buoyancy chamber (112), so that the connecting member (111) may be inserted and fixed into the cross-shaped stopper (113) to prevent the connecting member (111) from being detached or deformed in the XY direction, thereby stably supporting the buoyancy chamber (112).

Here, the stopper (113) is formed to have a spatial margin of 5% to 10% with respect to the connecting member (111), so that the insertion of the connecting member (111) into the stopper (113) can be facilitated.

In addition, as illustrated in FIG. 4, after the keel of the hull is secured on the connecting member (111), a step (S141) of additionally forming a support (114) that supports both ends of the lower part of the hull base line of the partially built ship on both sides of the upper surface of the buoyancy chamber (112) as needed is further included, so that unexpected overturning of the hull can be additionally prevented by the hull support of the support (114), thereby supplementing the role of the keel skeleton (110) that also serves as a buoyancy body.

For reference, assuming that the shape of the buoyancy chamber (112) of the first embodiment is a hexahedron, and that the height is 1.8 m, the width corresponding to the extreme breadth of the hull is 40 m, and the width is 20 m, the buoyancy chamber (112, 121) can generate an additional buoyancy of up to 1,440 tons.

In addition, as shown in FIGS. 5 and 6, the keel pelvis (120) of the second embodiment, which is also a buoyancy body, may be composed of a buoyancy chamber (121) that accommodates ballast water, and a steel keel structure (122) that extends in the length-over-all direction and has its lower surface integrally fixed to the buoyancy chamber (121) and its upper surface fixed or separated by welding to the lower part of the hull base line of a partially built ship.

Here, a plurality of filling spaces partitioned by bulkheads can be formed inside the buoyancy chamber (121), and ballast water of seawater or fresh water can be injected or drained through a pump (not shown) formed on the side or top surface of the buoyancy chamber (121) and a drainage hole (not shown) formed on the bottom surface of the buoyancy chamber (121), thereby generating additional buoyancy as much as necessary for buoyancy according to the design criteria of the ship design stage.

Here, some or no ballast water may be injected into the filling space inside the buoyancy chamber (121) to generate the necessary amount of additional buoyancy for the floating of the partially dry ship.

Meanwhile, as illustrated in FIG. 6, after the keel of the ship is installed on the keel structure (122), a step (S141) of additionally forming supports (114) on both sides of the upper surface of the buoyancy chamber (121) to support the lower ends of the hull base of the ship, as needed, is further included, thereby supplementing the role of the keel of the keel structure (120) that doubles as a buoyancy body by additionally preventing unexpected hull overturning due to the hull support of the support (114).

Subsequently, in the step of attaching the keel pelvis to the hull of the partially built ship (S150), as shown in (b) of FIGS. 7 and 9, after the step of installing the keel at the stern is performed, the keel pelvis (110, 120) for attaching the keel pelvis to the buoyancy body arranged in the full-width direction is attached and fixed by welding to the lower part of the hull base line of the partially built ship, so as to perform the role of a keel for the partially built ship.

Afterwards, in the additional buoyancy generation step (S160), when a fully built ship is launched, seawater or fresh water ballast is injected or drained into the keel pelvis (110, 120) that doubles as a buoyancy body of a partially built ship through a pump to generate the additional buoyancy required for buoyancy according to the design criteria of the ship design stage.

Subsequently, in the step of removing the keel pelvis combined with the buoyancy body of the fully built ship (S170), the keel pelvis combined with the buoyancy body (110, 120) is removed by welding from the lower part of the hull base of the fully built ship before pouring into the dry dock, so that, as shown in (c) of FIG. 9, when pouring into the dock gate, the keel pelvis combined with the buoyancy body (110, 120) of the fully built ship is not buoyed and only the fully built ship is buoyed.

At this time, the keel pelvis, which is also used as a buoyancy body, can be attached to the lower part of the hull base of the fully built ship. This is a case where, as described later, a partially built ship with a keel pelvis, which is also used as a buoyancy body, is floated and pulled out toward the dock gate of the dry dock, and then is sunk after being drained to perform the remaining hull construction work to become a fully built ship.

Meanwhile, after the keel pelvis (110) of the first embodiment is completely filled with water, the connecting member (111) is removed by welding from the lower part of the hull base line before the fully built ship is floated, or the connecting member (111) is separated by welding from the stopper (113) and the fully built ship is withdrawn from the dry dock to the quay wall, and then the connecting member (111) is separated by welding from the lower part of the hull base line by underwater welding work at the quay wall stage, thereby completely removing the keel pelvis (110) of the buoyancy body from the lower part of the hull base line.

Here, before floating a fully dry ship in a dry dock, after detaching the connecting member (111) from the lower part of the hull baseline, the connecting member (111) may be fixed by welding it to a stopper (113), or water may be injected into the internal filling space of the connecting member (111) to increase the weight and offset the buoyancy, so that the detached connecting member (111) does not float by its own buoyancy when floating a fully dry ship.

Meanwhile, after the keel pelvis (120) of the second embodiment is completely filled with water, the half-timber structure (122) is removed from the lower part of the hull base line before the fully built ship is floated, and the half-timber structure (122) is separated so that it is not floated when the fully built ship is floated.

Subsequently, in the dry ship buoyancy step (S180), as shown in (c) of Fig. 9, the dock gate is opened to allow seawater to flow into the dry dock, thereby buoying the fully-built ship and the partially-built ship, thereby maintaining the hull's balance by the buoyancy of the partially-built ship itself and the additional buoyancy of the keel pelvis (110, 120) that doubles as a buoyancy body, and allowing the ship to float stably within the dry dock.

That is, even when partially launched in one hold or two holds, the buoyancy is not sufficient compared to that of a fully built ship, but by attaching a keel pelvis (110, 120) that doubles as a buoyancy body to a partially built ship in one hold or two holds to provide additional buoyancy, sufficient buoyancy is provided to offset the increase in weight of the engine room area due to additional equipment specifications for eco-friendly shipbuilding, so that a partially built ship requiring additional hull construction can be floated simultaneously with a fully built ship scheduled to have its quay wall withdrawn.

Accordingly, even when building a partial ship in a dry dock, productivity can be improved by loading various loads regardless of weight.

Subsequently, in the fully dry ship quay wall withdrawal step (S190), the fully dry ship with the keel pelvis (110, 120) that serves as a buoyancy body removed is withdrawn from the dry dock to the quay wall by a tug ship.

In the final, partially built ship dock gate withdrawal step (S200), as illustrated in (d) and (e) of FIG. 9, the partially built ship is withdrawn toward the dock gate of the dry dock, the dock gate is closed, seawater is drained from the dry dock, the partially built ship with the keel pelvis (110, 120) attached as a buoyancy body is sunk in the dry dock, and the remaining hull construction is performed, but the keel pelvis (110, 120) attached to the lower part of the hull base of the partially built ship performs the role of a keel for the partially built ship.

Afterwards, by repeatedly performing the process of placing another keel pelvis combined with a buoyancy body in the emptied dry dock after the partial construction vessel is withdrawn in the direction of the dock gate and then settling another partial construction vessel and attaching the keel pelvis combined with a buoyancy body to the lower part of the hull base line, the efficiency of the hull arrangement can be improved.

Therefore, by configuring a dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy as described above, the keel pelvis combined with a buoyancy body can be attached to the lower part of the hull base line to provide complete and stable additional buoyancy regardless of the buoyancy draft of the partially built ship, and at the same time, it can perform the role of a keel pelvis within the dry dock, can be applied universally regardless of the ship type, can reduce the amount of ballast for hull buoyancy, can enable loading of various loads while satisfying the allowable draft and balance maintenance conditions, and can provide sufficient buoyancy to a partially built ship of one hold or two hold to float it even if the weight of the engine room area increases due to additional equipment specifications of an eco-friendly ship.

The present invention has been described above with reference to the embodiments illustrated in the drawings. However, the present invention is not limited thereto, and those skilled in the art will appreciate that various modifications or alternative embodiments within the scope equivalent to the present invention are possible. Therefore, the true scope of protection of the present invention should be defined by the following claims.

110,120: Buoyancy body and pelvic member 111: Joint member
112: Buoyancy chamber 113: Stopper
114: Support 121: Buoyancy Chamber
122: Repeating structure A: Deck house
B: Engine casing

Claims (12)

A step of determining the size of a keel keel that serves as a buoyancy body and a keel block and the fixing position below the hull baseline according to the weight and buoyancy of a partially built ship in a dry dock where multiple ship blocks of the same or different types are built in one or two rows;
A step of placing the keel skeleton of the partially built ship before the step of placing the keel skeleton of the partially built ship in the dry dock;
A step of inspecting the lower part of the hull of the partially built ship to which the buoyancy body and keel pelvis are attached;
A step of attaching the keel pelvis combined with the buoyancy body to the lower part of the hull base of the partially built ship;
When launching a fully built ship, a step of creating additional buoyancy by injecting or draining ballast water into the keel pelvis that doubles as a buoyancy body of the partially built ship;
A step of floating the fully built ship and the partially built ship by pouring water into the dry dock;
A step of withdrawing the above-mentioned fully-dried ship from the above-mentioned dry dock to the quay wall; and
A step of withdrawing the partially built ship toward the dock gate of the dry dock, draining the ship into the dry dock, sinking the partially built ship into the dry dock, and performing the remaining hull work;
The keel pelvis, which doubles as a buoyancy body, is attached to the lower part of the hull base of the above-mentioned fully-built ship,
A step of removing the keel pelvis combined with the buoyancy body from the fully-dried ship before placing the ship in the dry dock is further included.
The above buoyancy body and pelvis are,
A connecting member fixed or detached to the lower part of the hull base line of the partially built ship or the fully built ship; and
A buoyancy chamber coupled to the above-mentioned coupling member and containing equilibrium water;
Including,
The above-mentioned connecting members are arranged in a plurality of groups spaced apart from each other along the hull baseline of the partially built ship or the fully built ship or spaced apart diagonally, and are formed in a cross shape with one upper surface fixed to the lower part of the hull baseline.
A cross-shaped stopper having a shape corresponding to the shape of the above-mentioned connecting member and having a margin is formed by being recessed into the upper part of the above-mentioned buoyancy chamber, or
The above-mentioned connecting member is arranged in multiples spaced apart along the hull baseline of the partially built ship or the fully built ship and is formed in a cross shape with one upper surface fixed to the lower part of the hull baseline.
A dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, characterized in that a cross-shaped stopper corresponding to the shape of the above-mentioned connecting member and having a margin is formed by being recessed into the upper part of the above-mentioned buoyancy chamber. In the first paragraph,
Before the step of placing the buoyancy body and keel pelvis in the dry dock,
A dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, characterized in that it further includes a step of examining in advance the influence of the keel pelvis combined with a buoyancy body on the hull when the partially drydock is floated. delete delete In the first paragraph,
A dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, characterized in that it further includes a step of forming a support for supporting both ends of the lower part of the hull base line of the partially built ship or the fully built ship on both sides of the upper surface of the buoyancy chamber. delete delete In the first paragraph,
A dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, characterized in that the stopper is formed by being recessed to have a margin of 5% to 10% with respect to the connecting member. In the first paragraph,
The step of removing the keel pelvis combined with the buoyancy body from the above-mentioned fully-dried ship is as follows:
A dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, characterized in that after completely pouring water into the keel pelvis combined with a buoyancy body of the completely built ship, the connecting member is separated and removed from the lower part of the hull baseline before the completely built ship is floated, or the connecting member is separated from the stopper, the completely built ship is withdrawn from the dry dock to the quay wall, and then the connecting member is separated and removed from the lower part of the hull baseline at the quay wall. In the first paragraph,
The step of removing the keel pelvis combined with the buoyancy body from the above-mentioned fully-dried ship is as follows:
A dry dock tandem launching method using a keel pelvis combined with a buoyancy body having additional buoyancy, characterized in that after completely pouring water into the keel pelvis combined with a buoyancy body of the completely built ship, the joining member is separated from the lower part of the hull base before the completely built ship is floated, and then the joining member is fixed to the stopper or additionally poured into the joining member so that the joining member does not float by its own buoyancy. delete delete