NL2024729B1

NL2024729B1 - Ship cradle elevating/lowering apparatus

Info

Publication number: NL2024729B1
Application number: NL2024729A
Authority: NL
Inventors: Murata Kohei; Tanaka Shinji
Original assignee: Murata Yuatsukikai Co Ltd
Priority date: 2019-01-23
Filing date: 2020-01-22
Publication date: 2021-04-14
Also published as: NL2024729A; JP2020117067A; JP6735050B1

Abstract

To provide a ship cradle elevating/lowering apparatus capable of ensuring a sufficient lifting height of a ship bottom for safe mooring of the ship. [SOLVING MEANS] SOLUTION: A ship cradle elevating/lowering apparatus 6 disposed on a platform 2 and elevating/lowering a cradle 5 supporting a ship 7 placed thereon comprises a lifting member 86 having a movable end 86a connected to the cradle and a fixed end 86b connected to the platform, a lifting member support 83 on which the lifting member is bridged in an inverted U-shape, and a cradle elevating/lowering cylinder 80 elevating/lowering the lifting member support, and when 10 the lifting member support member is elevated/lowered by the cradle elevating/lowering cylinder, the movable end of the lifting member is elevated/lowered, so that the cradle is elevated/lowered between a mooring position at which the ship is moored in a water landing state and an evacuation position at which the ship is not affected by a rise of a sea surface.

Description

[Name of Document] SPECIFICATION [Title of the Invention] SHIP CRADLE ELEVATING/LOWERING APPARATUS [TECHNICAL FIELD]

[0001] The present invention relates to a ship cradle elevating/lowering apparatus. [BACKGROUND ART]

[0002] For example, Patent Document 1 discloses a floating berth including a frame structure bridged between paired floats separated in a width direction of a ship such that the ship is lifted by a ship support member driven by a winch disposed on the frame.

[PATENT DOCUMENT]

[0003] Patent Document 1: JP 2008-49977 A [SUMMARY OF THE INVENTION] [PROBLEMS TO BE SOLVED BY THE INVENTION]

[0004] In Patent Document 1, the frame structure includes two column members and a beam member connecting top parts of the two column members, and the frame structure has a substantially inverted U-shape in a side view. A ship is lifted by winding up a ship support member bridged across the bottom of the ship by using the winch disposed on the beam member of the frame structure. In Patent Document I, the ship is lifted for the purpose of preventing shellfish and algae from adhering to the ship bottom, and therefore, the lifting height of the ship bottom is such a level that the ship bottom is located slightly above the sea surface.

[0005] If the sea surface rises due to a storm surge, a tsunami, etc., and the ship bottom is only slightly away from the sea surface, the ship may overturn. However, in Patent Document 1, the ship must be lifted such that an upper deck or a bridge of the ship is not brought into contact with the beam member of the inverted U-shaped frame structure, and therefore, the lifting height of the ship bottom cannot sufficiently be ensured. Thus, Patent Document 1 has a problem that a ship cannot safely be moored when the sea surface rises due to a storm surge, a tsunami, etc.

[0006]

A problem to be solved by the present invention is to provide a ship cradle elevating/lowering apparatus capable of ensuring a sufficient lifting height of a ship bottom for safe mooring of the ship. [MEANS FOR SOLVING PROBLEMS]

[0007] In order to solve the problem, a ship cradle elevating/lowering apparatus according to an aspect of the present invention is a ship cradle elevating/lowering apparatus disposed on a platform and elevating/lowering a cradle supporting a ship placed thereon, the ship cradle elevating/lowering apparatus comprising: a lifting member having a movable end connected to the cradle and a fixed end connected to the platform; a lifting member support on which the lifting member is bridged in an inverted U-shape; and a cradle elevating/lowering cylinder elevating/lowering the lifting member support, wherein when the lifting member support is elevated/lowered by the cradle elevating/lowering cylinder, the movable end of the lifting member is elevated/lowered, so that the cradle is elevated/lowered between a mooring position at which the ship is moored in a water landing state and an evacuation position at which the ship is not affected by a rise of a sea surface. [EFFECT OF THE INVENTION]

[0008] According to the present invention, when the lifting member support is elevated by the cradle elevating/lowering cylinder, the movable end connected to the cradle is elevated, so that the cradle is elevated from the mooring position to the evacuation position. Therefore, when the sea surface rises due to a storm surge, a tsunami, etc., a sufficient lifting height of a ship bottom can be ensured for safe mooring of the ship. [BRIEF DESCRIPTION OF THE DRAWINGS]

[0009] Fig. 1 is a schematic plan view of a platform provided with a ship cradle elevating/lowering apparatus according to an embodiment. Fig. 2 is a side view of the cradle elevating/lowering apparatus when viewed from a side opposite to the platform in a ship width direction.

Fig. 3 is a view of the cradle elevating/lowering apparatus shown in Fig. 2 when viewed in a ship length direction.

Fig. 4 is a side view of the cradle elevating/lowering apparatus when viewed from the platform side in the ship width direction.

Fig. 5 is a view of the cradle elevating/lowering apparatus shown in Fig. 4 when viewed in the ship length direction.

Fig. 6 is an enlarged view of a main part for explaining a cradle lock apparatus of the cradle elevating/lowering apparatus shown in Fig. 1.

IO [EMBODIMENT(S) FOR CARRYING OUT THE INVENTION]

[9010] An embodiment of a ship cradle elevating/lowering apparatus 6 according to the present invention will now be described with reference to the drawings.

[0011] [Overall Structure of Offshore Platform] Fig. 1 is a schematic plan view of a platform 2 provided with a ship cradle elevating/lowering apparatus 6 according to an embodiment.

[0012] A work barge | is a self-elevating platform (SEP) including a platform 2 as an offshore structure disposed on the sea, leg elevating/lowering apparatuses 4 as vertical driving means, and legs 3 as a support column. The work barge 1 is used as a mooring facility for mooring ships, as an offshore wind power generation facility, as a pier for mooring ships, or as a floating heliport. A ship lifter, an offshore wind turbine, a crane, etc. are appropriately disposed on the platform 2.

[0013] After the work barge 1 is towed to a predetermined installation point, the legs 3 are relatively moved downward with respect to the platform 2 by the leg elevating/lowering apparatuses 4 at the predetermined installation point. When leg tips of the legs 3 are pushed into a sea bottom 9, a reaction force from the sea bottom 9 can be obtained, and the platform 2 can be elevated above the sea surface 8 by the reaction force. The platform 2 is raised to a height (e.g., about 10 meters) not affected by ocean waves. By maintaining this state, the self-elevating platform 2 is vertically disposed on the sea. When the self-elevating platform 2 is vertically disposed at a position higher than the sea surface 8, the platform 2 is hardly affected by ocean waves etc. and is less likely to shake.

[0014]

As shown in Figs. 1 to 3, the platform 2 has a substantially rectangular parallelepiped shape with a low height, is substantially rectangular when viewed from above, and includes an upper plate 21, a bottom plate 22, a side plate 23, and partition plates 24. For example, the platform 2 is 120 meters long x 40 meters wide x 6 meters high. To the platform 2, for example, four 800-ton class ships 7 can be moored.

[0015] Guide holes penetrating in a height direction (up-down direction) of the platform 2 are formed at four corners of the platform 2. The guide holes have, for example, a rectangular shape so that the legs 3 having, for example, a rectangular shape can be inserted in the up-down direction through the guide holes. An internal space surrounded by the upper plate 21, the bottom plate 22, and the side plate 23 is partitioned by the maltiple partition plates 24.

[0016] The internal space of the platform 2 has a water-tight structure so that the platform 2 can obtain a buoyant force from this water-tight structure, and the entire work barge 1 can float on water.

Therefore, while the work barge 1 floats on the sea surface 8, the work barge 1 can be towed and moved to the installation point. Additionally, the work barge 1 may include a propulsion apparatus such as a screw propeller so that the work barge | moves to the installation point through self-navigation.

[0017] As shown in Fig. 1, the leg elevating/lowering apparatus 4 are attached to the platform 2 as leg elevating/lowering units so as to surround the guide holes formed at the four corners of the platform 2. The leg elevating/lowering apparatuses 4 are locked by flanges disposed at upper ends of the leg elevating/lowering units to locking steps formed on the upper plate 21 of the platform 2 and are attached flush with the upper plate 21. According to this configuration, a worker can safely work on the upper plate 21 of the platform 2.

[0018] [Structure of Legs] As shown in Figs. 1 to 3, each of the legs 3 supporting the platform 2 is a hollow steel pipe having a rectangular shape (e.g., a substantially square cross section) and is 3 meters square and 50 meters long, for example.

[9019] The leg 3 has two opposite engagement surfaces 31, and multiple tapered engagement concave parts 35 are formed along a longitudinal direction of the leg 3 in a center in a width direction of each of the two engagement surfaces 31. The engagement concave parts 35 do not penetrate in a direction (lateral direction) orthogonal to the longitudinal direction of the leg 3. Preferably, the multiple engagement concave parts 35 are formed continuously in the longitudinal direction of the leg 3. According to this configuration, since the leg 3 can relatively be moved in the up-down direction by a slight amount and therefore can finely be positioned. The engagement concave parts 35 have a circular shape in a front view and have a tapered shape (trapezoidal shape) tapering toward 5 the inside of the leg 3 in a cross-sectional view. For example, the engagement concave parts 35 are formed to have an insertion opening diameter of 500 millimeters, a curved portion of 100 millimeters, and a pitch of 600 millimeters.

[0020] [Structure of Leg Elevating/Lowering Apparatus] Each of the leg elevating/lowering apparatuses 4 includes upper lock apparatuses 50a and lower lock apparatuses 50b serving as a lock apparatus 50, and leg elevating/lowering cylinders 60. The upper lock apparatuses 50a are attached to a movable base via brackets and are movable in the longitudinal direction (up-down direction) of the leg 3. The lower lock apparatuses 50b are attached to a fixed base via brackets and are immovable and fixed in the longitudinal direction (up-down direction) of the leg 3. The fixed base is fixed to the upper plate 21 of the platform 2.

[0021] In order to fixedly lock the leg 3, the upper lock apparatuses 50a and the lower lock apparatuses 50b are oppositely arranged on the engagement surfaces 31. The upper lock apparatuses 50a and the lower lock apparatuses 50b are respectively arranged on one side and the other side around the certain leg 3. Specifically, the upper and lower paired leg elevating/lowering cylinders 60 are disposed on the side of one of the engagement surfaces 31 and separated from each other in the longitudinal direction (up-down direction) of the leg 3, and the upper and lower paired leg elevating/lowering cylinders 60 are disposed on the side of the other engagement surface 31 and separated from each other in the longitudinal direction {up-down direction) of the leg 3. The upper tock apparatus 50a and the lower lock apparatus 50b have the same configuration as a cradle lock apparatus 50c described later and therefore will be described later in detail.

[0022] [Structure of Cradle Elevating/Lowering Apparatus] Fig. 2 is a side view of the cradle elevating/lowering apparatus 6 when viewed from the side opposite to the platform in the ship width direction. Fig. 3 is a view of the cradle elevating/lowering apparatus 6 shown in Fig. 2 when viewed in a ship length direction. Fig. 4isa side view of the cradle elevating/lowering apparatus when viewed from the platform side in the ship width direction. Fig. 5 is a view of the cradle elevating/lowering apparatus shown in Fig. 4 when viewed in the ship length direction.

[0023] Figs. 2 and 3 show the cradle elevating/lowering apparatus 6 when the ship 7 is at a mooring position for mooring in a water landing state. Figs. 4 and 5 show the cradle elevating/lowering apparatus 6 when the ship 7 is in the evacuation position not affected by a rise of the sea surface 8.

[0024] The cradle elevating/lowering apparatus 6 is disposed on the platform 2 and elevates/lowers a cradle 5 supporting the ship 7 placed thereon. The cradle elevating/lowering apparatus 6 includes the cradle 5, a lifting member 86, a lifting member support 83, and a cradle IO elevating/lowering cylinder 80.

[0025] The cradle 5 includes a placement-table supporting part 41, a placement table part 42, and a pair of guide columns 45 and has a substantially L-shape in a side view as shown in Fig. 3. The placement-table supporting part 41 is a plate-shaped body extending in the up-down direction. The placement-table supporting part 41 has a pair of left and right vertical frame parts 43 and a pair of right and left cradle-side connecting parts 44 projecting toward the platform 2 on the platform 2 side. The vertical frame parts 43 extend in the up-down direction and are arranged on the inside of the guide columns 45. Each of the vertical frame parts 43 has multiple support holes through which a support shaft 47 is inserted. The multiple support holes are arranged separately from each other in the up-down direction in the vertical frame part 43. The vertical frame part 43 is provided with multiple tapered engagement concave parts 75 at positions not overlapping the support holes. The cradle-side connecting parts 44 are arranged on the outside of the guide columns 45.

[0026] The multiple engagement concave parts 75 are formed separately from each other in the up-down direction of the vertical frame part 43. The engagement concave parts 75 have a circular shape in a front view and have a tapered bottomed shape (trapezoidal shape) tapering toward the outside of the vertical frame part 43 in a cross-sectional view. For example, the engagement concave parts 75 are formed to have an insertion opening diameter of 500 millimeters and a pitch of 3000 millimeters.

[0027] The placement table part 42 has a plate shape extending in the lateral direction (horizontal direction) from the ship 7 side of the placement table support part 41. At the mooring position shown in Figs. 2 and 3, the placement table 42 is located about 5 m lower than the sea surface 8, for example, and is separated from the bottom of the ship 7. As the placement-table supporting part 41 rises, the ship 7 is placed on the placement table 42 supporting the bottom thereof. At the evacuation position shown in Figs. 4 and 5, the placement table 42 is located about 10 m higher than the sea surface 8, for example. Therefore, for example, a height difference is about 15 m between the evacuation position and the mooring position.

[0028] The guide columns 45 have a column shape extending in the up-down direction and are supported by reinforcement columns 46 erected obliquely with respect to the upper plate 21 of the platform 2. The guide columns 45 have a U-shape in a plan view and have guide grooves 45a opened on the facing sides. The support shaft 47 is rotatably supported by the support holes formed in the vertical frame parts 43 of the placement-table supporting part 41. Roller parts 47b of the support shaft 47 are guided by the guide grooves 45a of the guide columns 45. Therefore, the placement-table supporting part 41 of the cradle 5 can move in the up-down direction along the guide columns 45. According to this configuration, the cradle 5 can stably be elevated/lowered along with the ship 7 placed on the placement table part 42.

[0029] The lifting member 86 has a movable end 86a connected to the cradle-side connecting part 44 of the cradle 5 and a fixed end 86b connected to a fixed-side connecting part 48 of the platform 2. The lifting member 86 is preferably an anchoring chain formed by linearly connecting oblong parts. As compared to a wire rope, the chain has advantages such as being less stretchable, being flexible and bendable, and requiring neither prevention of fraying at a cut end nor a process of attaching a clasp.

[0030] The lifting member support 83 includes two chain wheels (load sheaves) arranged between the movable end 86a and the fixed end 86b in planar view, i.e, a chain wheel 84a on the movable end 86a side and a chain wheel 84b on the fixed end 86b side. The two chain wheels 84a, 84b are rotatably supported by the lifting member support 83. On the lifting member support 83, the lifting member 86 is bridged in an inverted U-shape so that the lifting member 86 is meshed with the two chain wheels 84a, 84b. In the case of one chain wheel (road sheave), a large-diameter wheel must be used so as not to interfere with the cradle elevating/lowering cylinder 80 disposed below the lifting member support 83. In contrast, when the two chain wheels (road sheaves) 84a, 84b are disposed between the movable end 86a and the fixed end 86b in planar view, small-diameter chain wheels (road sheaves) can be used.

[0031] The cradle elevating/lowering cylinder 80 is vertically disposed on the upper plate 21 of the platform 2. The cradle elevating/lowering cylinder 80 has a piston in the cylinder 81 driven by a hydraulic pressure with a fluid etc. so that a piston rod 82 attached to the piston is driven in the up-down direction. The lifting member support 83 is attached to an upper end of the piston rod 82, so that the lifting member support 83 is elevated/lowered as the piston rod 82 moves up and down.

[0032] The fixed end 86b of the lifting member 86 is connected to the fixed-side connecting part 48 fixed to the upper plate 21 of the platform 2. On the other hand, the movable end 86a of the lifting member 86 is connected to the cradle-side connecting part 44 connected to the placement-table supporting part 41 configured to be movable in the up-down direction. Therefore, when the lifting member support 83 is elevated by driving the cradle elevating/lowering cylinder 80, the movable end 86a and the cradle-side connecting part 44 are elevated, and the placement-table supporting part 41 is thereby elevated. Therefore, the placement table 42 of the cradle 5 is elevated by elevating the lifting member support 83. The placement table 42 of the cradle 5 is raised to the evacuation position at a height (e.g., about 10 meters from the sea surface 8) not affected by a rise of the sea surface. Conversely, when the lifting member support 83 is lowered by driving the cradle elevating/lowering cylinder 80, the movable end 86a and the cradle-side connecting part 44 are lowered, and the placement-table supporting part 41 is thereby lowered. Therefore, the placement table 42 of the cradle 5 is lowered by lowering the lifting member support 83.

[0033] Since the fixed end 86b of the lifting member 86 is fixedly connected to the fixed-side connecting part 48 and the movable end 86a of the lifting member 86 is connected to the movable cradle-side connecting part 44, the lifting member support 83 behaves like a movable pulley. For example, when the lifting member support 83 is elevated by about 8 meters by driving the cradle elevating/lowering cylinder 80, the movable end 86a is elevated by about 16 meters, and the placement table 42 of the cradle 5 is elevated by about 16 meters. In other words, the movable end 86a and the placement table 42 are moved by a movement amount this twice as large as the movement amount of the piston rod 82 of the elevating/lowering cylinder 80. Therefore, the movement amount of the piston rod 82 of the cradle elevating/lowering cylinder 80 is smaller than the movement amount of the movable end 86a, so that the cradle elevating/lowering cylinder 80 with a short stroke can be used.

[0034] As described above, when the lifting member support 83 is elevated/lowered by the cradle elevating/lowering cylinder 80, the movable end 86a of the lifting member 86 is elevated/lowered, so that the cradle 5 is elevated/lowered between the mooring position at which the ship 7 is moored in the water landing state and the evacuation position at which the ship 7 is not affected by a rise of the sea surface. When the lifting member support 83 is elevated by the cradle elevating/lowering cylinder 80, the movable end 86a connected to the cradle 5 is elevated, so that the cradle 5 is elevated from the mooring position to the evacuation position. Therefore, when the sea surface rises due to a storm surge, a tsunami, etc, a sufficient lifting height of the ship bottom can be ensured for safe mooring of the ship 7.

[0035] Particularly, if the platform 2 is a pier disposed on the sea, the ship 7 can be moored at the evacuation position at the pier when the sea surface rises due to a storm surge, a tsunami, etc., which eliminates the need for an evacuation action in which the ship 7 is temporarily moved away from the pier and then returned to the pier again.

[0036] [Structure of Cradle Lock Apparatus] The cradle lock apparatus 50c for fixedly locking the elevated/lowered cradle 5 is disposed on the upper plate 21 of the platform 2. The cradle lock apparatus 50c serves as the lock apparatus 50 and has the same configuration as the upper lock apparatus 50a and lower lock apparatus 50b described above.

[0037] As shown in Fig. 6, the cradle lock apparatus 50c includes a cylinder 51, a piston rod 52, a piston 55, and an engagement pin 56. The engagement pin 56 is a tapered engagement pin having a substantially truncated cone shape. Therefore, the engagement pin 56 has a circular shape in a front view and has a shape obtained by adding a chevron shape of a pin tip 57 to a tapered shape (trapezoidal shape) tapering toward the engagement concave part 75 in a cross-sectional view. The cradle lock apparatus 50c is configured water-tightly due to a seal structure 53 having a seal member

54.

[0038] The cradle lock apparatus 50c has the piston 55 driven by a hydraulic pressure with a fluid etc. so that the engagement pin 56 attached to the tip of the piston 55 is driven in the horizontal direction (lateral direction). When the engagement pin 56 is driven toward the engagement concave part 75 formed in the vertical frame part 43, the tapered engagement pin 56 projects and is press-fit into and engaged with the tapered engagement concave part 75. In this case, an engagement convex surface 58 of the engagement pin 56 is circum{erentially closely engaged with an engagement concave surface 76 of the engagement concave part 75. This increases an engagement contact area between the engagement pin 56 and the engagement concave part 75 and facilitates positioning of the engagement between the engagement pin 56 and the engagement concave part 75, and therefore, the cradle lock apparatus 50c can fixedly lock the cradle in a reliable manner. When the engagement pin 56 is driven to the side opposite to the engagement concave part 75, the engagement pin 56 is retracted and disengaged from the engagement concave part 75. In this case, the engagement convex surface 58 of the engagement pin 56 is disengaged from the engagement concave surface 76 of the engagement concave part 75.

[0039]

The slope of the engagement convex surface 58 of the engagement pin 56 is configured to be larger than the slope of the engagement concave surface 76. For example, the engagement convex surface 58 has the slope of 15 degrees, and the engagement concave surface 76 has the slope of 14 degrees. In other words, the engagement convex surface 58 has the taper angle of 30 degrees, and the engagement concave surface 76 has the taper angle of 28 degrees. According to this configuration, the engagement convex surface 58 is engaged at an insertion opening portion on the outer side of the engagement concave surface 76, and therefore, even if the engagement pin 56 is reduced in diameter due to abrasion with the engagement concave part 75, the engagement pin 56 can further be projected toward the inside of the engagement concave part 75 for press-fitting, so that the cradle lock apparatus 50c can be used for a long time.

[9040] As shown in Fig. 6, in the engaged state, a gap is formed between the pin tip 57 of the engagement pin 56 and a back-side portion of the engagement concave part 75 formed in the vertical frame part 43. According to this configuration, even if the engagement pin 56 is reduced in diameter due to abrasion with the engagement concave part 75, the engagement pin 56 can further be projected toward the back side of the engagement concave part 75 for press-fitting, so that the cradle lock apparatus 50c can be used for a long time.

[0041] Although a specific embodiment of the present invention has been described, the present invention is not limited to the embodiment and can be implemented with various modifications within the scope of the present invention.

[0042] The number of the legs 3 is not limited to four disposed at the four corners of the platform 2 and may be six or eight. The height and diameter of the leg 3 can appropriately be determined depending on the size of the platform 2 etc. If the platform 2 has a large size and cannot sufficiently be supported by the legs 3 alone, a pile (not shown) can be introduced and disposed between the legs

3. While the platform 2 is supported by the legs 3 and the pile, the leg 3 can be replaced with a pile, and the replaced leg 3 can be used for another work barge 1. In this case, a pile can be introduced and disposed also into the guide hole in which the leg 3 is arranged.

[0043] The multiple engagement concave parts 75 may continuously be formed in the up-down direction of the vertical frame part 43. According to this configuration, the vertical position (height) of the cradle 5 can easily be determined by slightly moving the placement-table supporting part 41 in the up-down direction. The location of formation of the multiple engagement concave parts 75 is not limited to the vertical frame part 43. The multiple engagement concave parts 75 may be formed in the up-down direction in any portion of the placement-table supporting part 41 of the cradle 5.

[0044] The present invention and the embodiment are summarized as follows.

[9045] The ship cradle elevating/lowering apparatus 6 according to an aspect of the present invention is the ship cradle elevating/lowering apparatus 6 disposed on the platform 2 and elevating/lowering the cradle 5 supporting the ship 7 placed thereon, the ship cradle elevating/lowering apparatus 6 comprising: the lifting member 86 having the movable end 86a connected to the cradle 5 and the fixed end 86b connected to the platform 2; the lifting member support 83 on which the lifting member 86 is bridged in an inverted U-shape; and the cradle elevating/lowering cylinder 80 elevating/lowering the lifting member support 83, wherein when the lifting member support member 83 is elevated/lowered by the cradle elevating/lowering cylinder 80, the movable end 86a of the lifting member 86 is elevated/lowered, so that the cradle 5 is elevated/lowered between a mooring position at which the ship 7 is moored in a water landing state and an evacuation position at which the ship 7 is not affected by a rise of a sea surface.

[0046] According to the configuration, when the lifting member support 83 is elevated by the cradle elevating/lowering cylinder 80, the movable end 86a connected to the cradle 5 is elevated, so that the cradle 5 is elevated from the mooring position to the evacuation position. Therefore, when the sea surface rises due to a storm surge, a tsunami, etc., a sufficient lifting height of the ship bottom can be ensured for safe mooring of the ship 7.

[0047] In the ship cradle elevating/lowering apparatus 6 of an embodiment, the cradle 5 is fixedly locked by fitting the tapered engagement pin 56 of the cradle lock apparatus 50c disposed on the platform 2 into the tapered engagement concave part 75 disposed on the cradle 5.

[0048] According to the embodiment, the engagement pin 56 of the cradle lock apparatus 50c easily engages with the engagement concave part 75 of the cradle 5, and the engagement contact area is increased between the engagement pin 56 and the engagement concave part 75, so that the cradle tock apparatus 50c can fixedly lock the cradle in a reliable manner.

[0049]

In the ship cradle elevating/lowering apparatus 6 of an embodiment, the lifting member 86 is a chain.

[9050] According to the embodiment, as compared to a wire rope, the chain has advantages such as being less stretchable, being flexible and bendable, and requiring neither prevention of fraying at a cut end nor a process of attaching a clasp.

[0051] In the ship cradle elevating/lowering apparatus 6 of an embodiment, the lifting member support has the chain wheel 84a on the movable end side and the chain wheel 84b on the fixed end side both meshing with the chain.

[9052] According to the embodiment, since the chain wheel 84a and the chain wheel 84b are arranged on the movable end side and the fixed end side, respectively, the small-diameter chain wheels can be used.

[0053] In the ship cradle elevating/lowering apparatus 6 of an embodiment, the cradle 5 includes the placement table 42 on which the ship 7 is placed, and the placement-table supporting part 41 supporting the placement table 42, and the placement-table supporting part 41 is guided by the guide column 45 vertically disposed on the platform 2.

[0054] According to the embodiment, the cradle 5 can stably be elevated/lowered along with the ship 7 placed on the placement table part 42.

[0055] In the ship cradle elevating/lowering apparatus 6 of an embodiment, the platform 2 is a pier disposed on the sea.

[0056] According to the embodiment, the ship 7 can be moored at the evacuation position at the pier when the sea surface rises due to a storm surge, a tsunami, etc., which eliminates the need for an evacuation action in which the ship 7 is temporarily moved away from the pier and then returned to the pier again.

[0057] In the ship cradle elevating/lowering apparatus 6 of an embodiment, the platform 2 is of a self-elevating type.

[0058]

According to the embodiment, when the self-elevating platform 2 is vertically disposed at a position higher than the sea surface 8, the platform 2 is hardly affected by ocean waves etc. and is tess likely to shake. [EXPLANATIONS OF LETTERS OR NUMERALS]

[0059] Ll work barge 2 platform 3 leg IO 4 leg elevating/lowering apparatus 5 cradle 6 cradle elevating/lowering apparatus 7 ship 8 sea surface 9 sea bottom 21 upper plate 22 bottom plate 23 side plate 24 partition plate 31 engagement surface 35 engagement concave part 41 placement table support 42 placement table part 43 vertical frame part 44 cradle-side connecting part 45 guide column 45a guide groove 46 reinforcement column 47 support shaft 47a shaft part 47b roller part 48 fixed-side connecting part 50 lock apparatus 50a upper lock apparatus 50b lower lock apparatus 50c cradle lock apparatus

51 cylinder 52 piston rod 53 seal structure 54 seal member 55 piston

56 engagement pin 57 pin tip 58 engagement convex surface 60 leg elevating/lowering cylinder

75 engagement concave part 76 engagement concave surface 80 cradle elevating/lowering cylinder 81 cylinder 82 piston rod

83 lifting member support 84a chain wheel on movable end side 84b chain wheel on fixed end side 86 chain (lifting member) 86a movable end

86b fixed end

Claims

ConclusiesConclusions

1. Scheepshellingwagen-hetf/neerlaat-inrichting die is aangebracht op een platform en die een hellingwagen die een daarop geplaatst schip ondersteunt heft/neerlaat, waarbij de scheepshellingwagen -hef/neerlaat-inrichting omvat: een heforgaan met een beweegbaar uiteinde dat is verbonden met de hellingwagen en een vast uiteinde dat is verbonden met het platform; een heforgaan-ondersteuning waarop het heforgaan in een omgekeerde U-vorm wordt overbrugd; en een hellingwagen-hef/neerlaat-cilinder die de heforgaan-ondersteuning heft/neerlaat, waarbij, wanneer de heforgaan-ondersteuning wordt geheven/neergelaten door de hellingwagen- hef/neerlaat-cilinder, het beweegbare uiteinde van het heforgaan wordt geheven/neergelaten, zodat de hellingwagen wordt geheven/neergelaten tussen een afmeerpositie waarin het schip is i5 afgemeerd in een water-landingsstaat en een evacuatiepositie waarbij het schip niet wordt beïnvloed door een stijging van een zeeoppervlak.A slipway car lifting / lowering device mounted on a platform and lifting / lowering a slipway car supporting a ship placed thereon, the slipway car lifting / lowering device comprising: a lifting means having a movable end connected to a slipway car lift / lowering device. the ramp and a fixed end connected to the platform; a lifter support on which the lifter is bridged in an inverted U shape; and a ramp car lift / lower cylinder that lifts / lowers the elevator support, wherein when the elevator support is raised / lowered by the ramp car raise / lower cylinder, the movable end of the elevator is raised / lowered, so that the ramp car is raised / lowered between a mooring position in which the ship is moored in a water landing state and an evacuation position in which the ship is not affected by a rise in a sea surface.

2. Hef/neerlaat-inrichting volgens conclusie 1, waarbij de hellingwagen vast is vergrendeld door het aanbrengen van een taps toelopende aangrijppen van een hellingwagenvergrendelingsinrichting, die op het platform is aangebracht, in een taps toelopend concaaf aangrijponderdeel dat op de hellingwagen is aangebracht.The raising / lowering device of claim 1, wherein the ramp car is fixedly locked by arranging a tapered engagement of a ramp cart locking device disposed on the platform in a tapered concave engagement member disposed on the ramp cart.

3. Hef/neerlaat-inrichting volgens conclusie 1 of 2, waarbij het heforgaan een ketting is.A lifting / lowering device according to claim 1 or 2, wherein the lifting means is a chain.

4. Hef/neerlaat-inrichting volgens conclusie 3, waarbij de heforgaan-ondersteuning een kettingwiel heeft aan het beweegbare uiteinde en een kettingwiel aan het vaste uiteinde die beide aangrijpen op de ketting.The lifting / lowering device of claim 3, wherein the lifting member support has a sprocket at the movable end and a sprocket at the fixed end, both of which engage the chain.

5. Hef/neerlaat-inrichting volgens ten minste één van de conclusies 1 tot en met 4, waarbij de hellingwagen een plaatsingstafel omvat waarop het schip wordt geplaatst, en een plaatsingstafel- ondersteuningsdeel dat de plaatsingstafel ondersteunt, en waarbij het plaatsingstafel- ondersteuningsdeel wordt geleid door een geleidingskolom die verticaal op het platform is aangebracht.A raising / lowering device according to at least one of claims 1 to 4, wherein the ramp car comprises a deployment table on which the vessel is placed, and a deployment table support member supporting the deployment table, and wherein the deployment table support member is guided by a guide column mounted vertically on the platform.

6. Hef/neerlaat-inrichting volgens ten minste één van de conclusies 1 tot en met 5, waarbij het platform een in zee geplaatste pier is.A lifting / lowering device according to at least one of claims 1 to 5, wherein the platform is an offshore pier.

7. Hef/neerlaat-inrichting volgens ten minste één van de conclusies 1 tot en met 6, waarbij het platform van een zeltheftype is.A lifting / lowering device according to at least one of claims 1 to 6, wherein the platform is of a self-lifting type.