GB2554246A - Variable foundation structure of marine support structure and method for installing marine support structure, using same - Google Patents
Variable foundation structure of marine support structure and method for installing marine support structure, using same Download PDFInfo
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- GB2554246A GB2554246A GB1717289.1A GB201717289A GB2554246A GB 2554246 A GB2554246 A GB 2554246A GB 201717289 A GB201717289 A GB 201717289A GB 2554246 A GB2554246 A GB 2554246A
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- marine support
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/04—Flat foundations in water or on quicksand
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- General Engineering & Computer Science (AREA)
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Abstract
Disclosed is an invention relating to a variable foundation structure of a marine support structure. The variable foundation structure of a marine support structure according to the present invention comprises: a foundation part which is installed at a body of the marine support structure, has a containing part capable of containing seawater therein, and supports the body when the foundation part is installed on the sea bed; and a foundation connection part which rotatably connects the foundation part to the body .
Description
I DESCRIPTION] [Invention Title] VARIABLE FOUNDATION STRUCTURE OF MARINE SUPPORT STRUCTURE AID METHOD FOR INSTALLING MARINE SUPPORT STRUCTURE, USING SAM! [Technical Field]
The present invention relates to a variable foundation structure of a marine support structure and a method of installing a marine support structure using the same, and more specifically, to a variable foundation structure of a marine support structure in which ;a body posMon and a disposition are variable, and a method of installing a marine support structure using the same.
[Background Art] A marine support structure, which is a structure that supports a lower portion: of a system installed at sea such as a marine weather tower, an offshore wind turbine, an offshore plant, an ocean station, and the like so that the system is normally operated, can be broadly categorized into a fixing-type structure which is rigidly constructed on a seabed ground and a floating-type structure that floats like a ship and is: Jtof ly iaa atnehor installed in the seabed ground, A fixing-type offshore support structure is typically designed and manufactured fo forms of a gravity type, a mono-pile type, a jacket type, a tripod type, and the like, Mosf |f the fixing-type offshore support structures are normally loaded on a large barge, are transferred to a site, and are then installed using a large installation ship or a marine crane, and thus large equipment is necessary and much cost and lime tor processes of transferring and instillation are consurhed, that is, a long period of several months for a heavy duty installation task is required.
Also, a pile foundation is normally constructed into a rock formation formed In a deep place when the offshore support structure is installed on a soft ground and, in this case, time and oasts are further increased.
To solve such a problem, a structure in which a foundation part fixed to a sea bed at a predetermined depth is integrally coupled to a lower portion of a loafinp type body, which has a weight that can he changed by introducing seawater, is disclosed,:
Heavy-duty tasks, such as flattening the seabed ground, removing riprap, and the like, are required before a body with a flat lower surface is installed, and costs |nd time for the tasks can be remarkably reduced by including a foundation part.
Howevef, the foundation part causes a limitation on a depth of water by as much as a length of the foundation part such that a latmcbing task;: itr a harbor primarily performed to perform;: a floating: transfer is virtually impossible, dhereforei after the structure is transferred to an area of a sea that has a minimum depth of water using a barge, the launching should be performed using equipment, isfoh as a marine crane and the like, and, in this case, a conventional apparatus has a disadyanta|e in that large equipment should be used,
Als% drag applied to the marine support structure is increased as a projected |req of seawater of the marine support structure is increased due to the foundatioft part, and as much towing force as is required to overcome the drag is additionally required at a time of floating transfer such that there is a problem in that transfer performance is degraded. Therefore, a there is a demand for improving the problem. A background art of the present invention is disclosed in Korean Patent Laid-Open No. 2013-0122168 (Nov. 07. 2013, Title of Invention: Ferroconcrete Structure Keeping Buoyant Function for Establishing Offshore Wind Turbine) [Technical Problem]
The present invention is directed to providing a variable foundation structure of a marine support structure capable of performing self-installation and floating transfer1 functions ant solving a problem o|)a limitation on depth of water and m degradation of transfer performance, and a method of installing a marine support structure using the same, [ Techni cal S olution ]
One aspect of the present invention provides a variable foundation slrueture of a marine support structure including a foundation part installed on a body of a marine: support structure, having m containing part configured to contain seawater, and configured to support the body when installed on a seabed, and a foundation connection part configured to rotatably connect the foundation part to the body.
The foundation part may include a foundation body part having the containing part, a body connection part configured to close ono side part of the foundation body part, connected to the foundaios connection part, positioned at a lower part, of the foundation body pari when the marine support structure is being float-transfiM, and positioned at an upper portion of the foundation body part when the marine support structure is being installed, and an open part configured to open the other side part of the foundation body part and moved under a seawater surface when the foundation body part rotates downward so that seawater is introduced into the foundation body part.
Tie foundation part may further include a pump configured to control ai amount of seawater contained in the foundation body part.
The foundation connection part may include a pin joint installed in the holy and configured to support fhe foundation part to be vertically rotatable*
Ihe pin joint may include a fixing connection part formed in the body, a rotary connection pari formed in the foundation part and disposed to be adjacent to the fixing connection part, and a rotating shaft part configured to rotatably fasten the rotary connection pari to the fixing: connection part.
The foundation connection part may include a link device installed in the bedv and configured to support the foundation part to he vertically rotatable.
The link device may include a first link having one end rotatably connected: to the body and coupled with the foundation part, a second link connected to the other end of the first link, and a third link haying one end connected to the second link and fite oiler end rotatably connected to the body above the first link.
The variable foundation structure of a marine support structure maty further include a foundation support device installed in the body and configured to support the foundation part at a predetermined angle.
The foundation support device may indude m support installed to vertically extend from the body and configured; to be in contact with a side part of the foundation part, and a fastening device installed in the support and fastened to the connection member connected to the foundation pig.
The foundation support device may furthif include a rotary fixture inserted into a space part formed between a side part of the body, the foundation part, and the foundation connection part while the foundation part is;: rotated downward and configured to lock the rotation of the foundation part.
The rotary fixture may include a first contact part having a shape corresponding to one side of the body to ibee the body of the foundation oermsetion part, and a second contact part having a shape corresponding to the one side of fixe foundation connection part to face the body and having a wedge shape with tie first contact part.
The variable foundation structure of a marine support structure may further include a shock absorbing device irrttblled on the foundation pari or a lower part of the body and configured to absorb a shock applied to the body and the feundation part when the foundation partis rotated.
The shock absorbing device may include a tube made of non-metal elastic material.
Another aspect of the present invention provides a method of installing a marine support structure including a launcMngsstep of positioning an open part of a foundation part installed on a body of a marine support structure above a water line and performing launching when a rotation of the foundation, part is locked, a float-transferring step of float-transferring the marine support structure to a required offshore position, an unlocking step of unlocking the rotation of the; foundation part when the marine support structure approaches a required position, a foundation part changing step of rGtartnpfoe foundation part downward while seawater is introdueel into the foundation part, a foundation part mounting step of mounting the foundation part at a lower portion of the body while continuing to rotate the foundation part, and an installation step of submerging ;® installing; tie; marine support sfoncture. lbs launching step may mAde a setting step of controlling a rotation angle of the foundation part so that the open part is positioned at an upper portion of the foundation pail;, and a rotation locking step of locking the rotation of the foundation part by fastening the foundation part to the body.
The foundation part-changing step may include a seawater injection step of rotating the foundation partsiownward while injecting seawater into the foundation part, and a foundation part installing step of continuing to rotate the foundation part whioihO:seawater is introduced into the foundation part through the open part.
The foundation mounting step may include a rotating and mounting step of continuing to rotate the foundation part nihil the foundation part is mounted at a low# pdrtion of the body, and a fixing step of locking the wtatfon of the foundation part when the foundation part is mounted on the lower portion: of the body.
[Advantageous Effects]
The variable foundation structure of a marine support sfouetore according to the present invention and the method of installing a: marine support structure using the same can further lower a waver line of a marine support structure using buoyancy applied to a foundation part while seawater is not introduced into the foundation part, and can reduce drag applied to live marine support, structure by reducing a projected area of seawater.
Therefore, according to the present invention, launching can be performed in a harbor at a depth of water shallower than that of deep seawater in which the marine support structure is installed, and the marine support structure can be easily float* transferred to a required offshore position with less towing force.
Also, according to the present invention, the foundation part can be rotated: downward about a connection part with a foundation connection part: toward a lower side of the body by introducing seawater into the foundation part to increase a weight of the: foundation part, and thus the marine support structure can be easily and strongly self-installed^ amptired offshore position using the foundation part while a position and disposition of the foundation part is changed, [Description of Drawings] FIG. 1 is a perspective view schematically showing if mMne suJpM structure according to a first embodiment of the present invention. FIG. 2 is a front view of main parts of FIG. 1. FIG. 3 is a side view of FIG. 2. FIG. £ isf a perspective view schematically showing a state in which a foundation part of the marine support structure according to the first embodiment Of the present invention is rotated downward, FIG. 5 is a front view of main parts of FIG. 4. FIG. 6 is a side view of FIG, 5. FIG. 7 is a perspective view schematically showing a marine support structure according to a second embodiment of the present invention. FIG, 8 is a front view of main parts of FIG, 7. FIG. 9 is a perspective view schematically showing a state in which a foundation part of the marine support structure according to the second embodiment of the present invention is rotated downward, FIG, 10 is a front view of main parts of FIG 9. FIG. i I is a side view schematically showing a foundation structure of a marine support sfruedumaecording to a third embodiment of the present:invention. FIG. 12 is a conceptual view showing a process in which a foundation part of fire marine support structure according to the third embodiment of the present invention is rotated downward. FIG, 13 is a conceptual view showi ng that the foundation part of the marine support structure according to the third embodiment of the present invention is rotated downward. FIG, 14 is a front view schematically showing a matise supiort structure according to a fourth embodiment of the present in vention. FIG, 15 is a front view showing a state in which the marine support structure according to the fourth embodiment of the present invention is rotated downward. FIG. 16 is a conceptual view showing a launching step of a method of installing a marine support structure according to one embodiment of the present invention. FIG, 17 is a conceptual view showing a floating transfer step of the method of installing a marine support structure according to one embodiment of the present .invent ton. FIG. 18 is a conceptual view showing an unlocking step of the method of pstdiihg a marine support structure according to one embodiment of the present invention. FIG. 19 is a conceptual view showing a state before a foundation structure is rotated downward in a foundation part, changing step of the method of installing a marine support, structure according to one embodiment of the present invention. FIG. 20 |s; m conceptual view showing a slate in which the; foundation structure is rotated downward in the foundation part changing step of the method of installing a marine support structure according to one embodiment of the preserf invention. ΙϊΌ, 21 is a conceptual view showing a state before the foundation structure Is mounted in a foundation mounting step of the method of installing a marine support structure according to one embodiment of the present invention. FIG. 22 is a conceptual view showing that a state in winch the foundation structure is mounted in the foundation mounting step of the method of installing m marine support structure according to one embodiment of the present invention, FIG. 23 is a conceptual view showing an installation step of the method of installing a marine support structure according to one embodiment of the present: invention, FIG. 24 is a free body diagram showing a force applied to the foundation par! in the launching step and the floating transfer step of the method of installing a: marine support structure according to one embodiment of the present invenion. FIG. 25 is a free body diagram showing a force applied to the foundation pari : before the foundation part is rotated in the foundation part changing step of the method of installing a marine support structure according to ode embodiihebt of the present, invention. FIG. 26 is a free body diagram showing a force applied to the; foundation part at the beginning of the rotation of the foundation part in the foundation part changing step of the method °f installing a marini support structure according to one embodiment of the present invention. FIG. 27 is a freehpdy diagram showing a force applied to the feundatfon part at the end of the rotation of the foundation part in the foundation part changing step of the method of installing a marine support structure according to one embodiment of the present invention. MI. I! is a ise ii5% diagram showing a force applied to the foundation part before the foundation part is mounted in the foundation mounting step of the method of installing a marine support structure according to one embodiment of the present invention. FIG. 29 is a free body diagram showing a force applied to the foundation part after the foundation part is mounted in the foundation part mounting step of the method of installing a marine support structure according to one embodiment of die present invention.
[Modes of the Invention!
Hereinafter., embodiments of a variable foundation structure of a marine support structure according to the present invention and a method of installing a marine support structure using the same will be described with; reference; fo; foe accompanying drawings. In the drawings, thicknesses of lines or sizes of elements may be exaggeratedly illustrated for clarity and convenience of description.
The following terms are defined in consideration of the functionality of the embodiments of the present invention and may vary according to intentions of a user or an operator or according to usual practice. Therefore, the terms should he defined on the basis of the overall content of the specification. FIG. 1 is a perspective view schematically showing a marine support structure according to a :SfSt embodiment of the present invention. FIG. % is a front view' of main parts of FIG. 1, FIG. 3 is a side view of FIG. 2, FIG. 4 is a perspective View schematically showing a state in which a foundation part of the marine support staicture according to the first embodiment of the present invention is rotated downward. FIG. | is a front view of main parts of FIG. 4, and FIG. 6 is a side view' of FIG. 5.
Referring to FIGS. 1 to 3, variable foundation, structures 3 si a ϋϋϊ support structure 1 according to the first embodiment of the present invention each include a foundation pari 1 (1 a foundation connection part 20, a foundation support device 30, and a shock absorbing device 40.
The foundation pari 10 includes a containing part 12 capable of containing sea water disposed on a side part of a body 2 of the marine support structure 1. The plurality of foundation parts 10 are disposed at positions separated from a center of mass of the body 2, for example, along a circumference of the body 2 at regular intervals or at regular angles. The foundation part 10 has a flat bottom and has a cup shape with an open part 14 formed on a side opposite the bottom.. 'lire foundation part 10 has a weight and buoyancy varied depending on an amount of introduction of seawater introduced into the containing part 12. M tie amount of seawater introduced into the foundation part 10 is increased, the weight of the foundation part 10 is increased. The foundation part 10 is partial!! slpierged or folly submerged in seawater such that buoyancy is changed as much as a weight of seawater pushed by the foundation part 10 and is apphed to the foundation part 10.
When the weight of the foundation part IJ is minimized, the marine support structure 1 more easily floats and is transferred using the buoyancy applied to the foundation part 10, Also, the seawater is introduced into the containing part 12 of the foundation part 10 to increase the weight of the foundation part, and the foundation part 10 is rotated downward; about a connection part with; the eccentrically located foundation connection part 20 to be separated from the side part of the body 2.
In this ease, the foundation part 10 keeps rotating until the foundation part 10 comes into contact with a lower Surface of the body 2, as shown in;#IG|< 4 to I, as; upper portion of the foundation part 10 comes into contact with the lower surface; of the body 2 while the foundation part 10 lis overturned, anirtle natation is stopped, fhe foundation part. 10 is fixedly installed at. a sea bed while mounted at the lower surface of the body 2, and supports the body i on an upper side thereof and a weight of marine equipment installed in the body 2, The foundation part 10 according to the first ernbodime.nl of the present invention includes a foundation body pari 11, a body connection pari 13, the open part 14, and a pump 15.
The foundation body part 11, which is a portion forming a frame to support::: the body 2, is formed to include the; containing pari 12 which is hollow. The foundation body part 11 according to the first embodiment of the present invention has a cylindrical shape.
The body connection part 13 is a portion that provides ah Installation surface on which the foundation coilection part; IP and the pump li are installed, comes Into contact with the lower surface of the:;: body 2 when being overturned, and is formed to be closed at one side of the foundation body part fl. The body connection p art: 13 according to the first embodiment of the present invention has a flat shape corresponding to the lower surface of the body 2. lire body connection part 13 is positioned at a lower portion of the foundation body pant 11 when the marine support structure 1 floats; and is transferred, and is positioned at an upper portion of the foundation body part 11 to be in contact with the lower surface of the My 2 at a time of installation of the marine support structure 1.
The open part 14 is a portion forming a path through which seawater is introduced into the foundation body part II when the foundation body part 11 is indited, and is formed at the other side of the foundation body part 11 to he open. The open part 44 is positioned at an upper portion of the foundation body part 11 when the marine stipporf structure 1 floats and is transferred, and forms the path through which seawater is introduced into the foundation body part. II when the foundation body part 11 is rotated downward and moved under seawater.
The pump 15 forcibly introlwees or discharges seawater into or from the foundation body part. 11. The pump 15 is installed at the foundation body part 11 or the body connection part 13, When the open part l| is positioned above a surface of the sea, the bodv connection part 13 is positioned under the surface of the sea (see FIG. 24), and when the pump 15 is installed in the body connection part 13, He weight of the foundation part 10 is increased by introducing seawater infos the foundation body part 11 when the foundation body part 11 is not inclined. Also, the bidirectionally operated pump 15 may control a rotation speed of the foundation hod> part 11 by discharging seawater inside the foundation body part 11 to the outside of the foundation body part 11.
The foundation connection part 20 connects the foundatiompart M forthe side part of the body 2 to be vertically rotated. The foundation part 10 faces tire side part of the body 2 when rotated upward, and comes into contact with a lower surface of the body 2 when rotated downward. The foundation connection part 20 is preferably disposed at an edge of a lower portion of the bodv 2 The foundation §bnnection part 20 according to the first embodiment of the present invention has a structure of a pin joint 21 including a fixing connection part 22, a rotary connection part 23, and a rotating shaft part 24.
The fixing connection part 22 laterally protrudes from a lower portion of the side part of the body 2. The rotary connection part 23 is formed on the body connection part 13 of the foundation part 10 and is formed at a position which deviates from the center of mass of the foundation part 10. The fixing connection gait 22 and the rotary connection part 23 are disposed in a straight line to be adjacent to each other. The rotating shaft part 24 rotatably fastens the rotary connection part 23 to the fixing connection part 22, A pin member that continuously passes through the fixing connection part 22 and the rotary connection part 23 may be applied as the rotating shaft part 24, the foundation support device 30 is a device for supporting the foundation part 10 g| a predetermined angle and is fixedly installed at the sidi part of the body 2« The foundation support device 30 according to the first embodiment of the present invention includes a support 31, a fastening device 32, and a rotary fixture 35.
The support 31 has strength capable of supporting a load of the foundation part 10 and is installed to vertically extend at the side part of the body 2. When the support 31 is formed to vertically extend, the foundation part 10 is vertically upright while the foundation part 10 is in contact with the support 31, as shown in FIG. 3, aid a side part of the foundation part 10 is continuously and stably in contact with IhesSUpport 31 in the vertical direction.
The fastening device 32 is a device for locking rotation of the foundation part 10 when the foundation part 10 is set as ||dfm in FIGS. 1 to 3 and is formed on the support 31. The fastening device 32 according Jg the first embodiment of the present invention has a hook shape to be fastened to a connection member 33 such as a rope. The. foundation part 10 may be easily and strongly fastened to the fastening device 32 using the connection member 33. such as a rope, and may lock the foundation part 10 from being arbitrarily rotated,
The rotary fixture 35 is a device for locking the rotation of the foundation part 10 when the foundation part 10 is rotated downward, as shown in FIGS. 4 to 6, Referring to FIG, i, the rotary fixture 35 according to the first embodiment of the present invention includes a first contact part 36 and | Second contact part 37 and is inserted into a space part 34 formed between the side part of the body 2,, the foundation part 10, and the ffoftdiien connection part 20.
The first contact part 36 has a shape corresponding to one side of the body % that faces the foundation connection part 20. The second contact part 37 has a shape colpponding to one side of the foundation connection part 20 that faces the body 2 and has a wedge shape with the first contact part 3# More specifically, the second contact part 37 has a shape corresponding to the rotary connection: fart 23, abb the first contact part 36 has a shape corresponding to a part of the: side of the body 2 that faces the rotary connection part 23.
The foundation part 10 is overturned, as shown in FIGS. 4 to 6, and the rotary fixture 35 is inserted into fire space part 34 formed between the body 2 aid tip; foundation connection part 20 such that the rotary fixture 35 may lock rotation of the foundation eonhedipn fart 20 and may stably maintain a state in which the foundation part 10 is mounted on the lower surface of the body 2,
The shock absorbing device 40 is a device for absorbing a shock applied to the foundation part 10 and the body 2 by a rotating force of the foundation part 10. When the foundation part. 10 is rota ted downward, the body connection part. 13 of the foundation part 10 and the lower surface of the body 2 come into contact with each other, and the shock absorbing: deviee 40 may be installed in the body connection part 13sof the foundation part Tiort|m Ipwer surface of the body 2. A tube made of a non-metal elastic material may be used as the shock absorbing device 40. FIG. 7 Is a perspective view schematically showing a marine support structure according to a second embodiment of the present inven tion, FIG,8 is a front view of main parts of FIG, 7, FIG. 9 is a perspective view schematically showing a state in which a foundation part of the marine support structure according to the Second embodiment of tie present irfoention is rotated downward, and FIG. 10 is a front view of main parts of FIG. 9.
In a foundation structure 3 of a marine support structure 1 according to the second embodiment of the present invention, a foundation connection part 20 has a axis parallel with a normal line direction of an edge of a body 2 rather than a centra] rotational axis parallel with the normal direction of the edge of the body 2 in comparison to the foundation structure 3 of the marine support structure 1 according to the first, embodiment of the present invention.
In this case, it is preferable for the body 2 having a foundation installation part 2a that supports a load of a foundation part 10, provides an: installation surface of the foundation connection part 20, and provides a mounting surface on which a body connection part 13 of the foundation part 10 may be mounted. The foundation installation part 2a laterally protrudds aid has flat lower aid upper surfaces.
While the foundation part 10 is set, as: shown in FIGS, t and; 8| the body: connection part 13 may he mounted on the upper surface of the foundation installation part 2a. Also* while the foundation pari 10 is overturned, as shown in FIGS. 9 and 10, the body connection part 13 is mounted on a lower surface of the: foundation installation part 2a.
As long as the foundation structure 3 of the marine support structure I according to the present invention may changes a weight and buoyancy of the foundation part 10 while vertically rotating the foundation part 10, the foundation slfueture is not limited to a specific structure and shape, including those of the first embodiment shown in FIGS, 1 to | bnd the second embodiment shown in FIGS. 7 |o 11
In the description of the foundation structure 3 of the marine support structure 1 according to the second embodiment of the present:: invention, overlapping or uo^Spondfogdescriptions related to the foundation structure 3 of the marine support structure 1 according to the first embodiment of foe present invention have been omitted. FIG. 11 is a side view schematically showing a foundation structure of a marine support structure according to a third embodiment of the present invention, FIG. 12 is a conceptual view showing a process in which a foundation part of the marine support structure according to the third embodiment of the present inventfol is rotated downward, and FIG. 13 is a conceptual view showing that the foundation part of the marine support structure according to the third embodiment of the present invention is rotated downward.
Referring to FIG. II, a foundation structure I of a marine support structure 1 according to the third embodiment of the present invention may have a structure of a link device 25 including a foundation connection part 20 having a first link 26, a second link 27, and a third link 28 in conlparisph to the foundation structure 3 of the marine support structure 1 according to the first embodiment of the present invention.
The first link 26 has: a stick shape anl has one end rotatably connected to a lower portion of a body 2 and the other end hinge-connected to the second link 27. When the first link 26 is set so that a foundation pail 10 is upright, the first link 26 is coupled to the foundation part 10 to support a lower end of the foundation part 1|, Therefore, while the foundation part 10 isfoel los be vertically upright, as shown in FIG. 11, the first fink 26 is parallel with a body connection part 13 of the foundation part 10, When a displacement of the first link 26 is generated, the foundation part 10 rotates with the first link 26 and is overturned as shown in FIGS. 12 and 13.
The second link 27 has a stick shape and has one end hinge-connected to the other end of the first link 26 and the other end hinge-connected to the third Sink 28. The third link 28 has a stick shape and has one end connected to the second link 27 and the other end rotatably connected to the body 2 above the first link 26.
When the body 2 and the foundation: part 10 are tmfastened while the foundation part 10 is set to be vertically upright, the foundation part 10 rotates downward from the one end of the first link 26, as shown in FIGS. 12 and 13.
As long as the foundation structure 3 of the marine support structure 1 according to the present invention rotatably supports the foundation part 10 in a vertical direction, the foundation structure 3 is not limited to a specific structure and shape, including those of the first embodiment shown in FIGS. 1 to 6 and the third-embodiment shown in FIGS. 11 to 13.
In the description of the foundation structure 3 of the marine support structure Ϊ according to the third embodiment of the present invention, overlapping or corresponding descriptions related to the foundation structure 3 of the marine support structure 1 according to the first embodiment of the present invention have been omitted. FIG. 14 is a front view schematically showing a marine support structure according to a fourth embodiment of the present invention, and FIG, 15 is a front view' showing a state in which the marine support structure according to the fourth embodiment of the present invention is rotated downward. A foundation structure 3 of a marine support structure 1 according tp the fourth embodiment of the present invention has a body 2 with | typical-type of support structure, for example a jacket-type support structure, rather than a gravity-type support structure in comparison to the foundation!: structure 3 of the marine support, structure 1 according to the first embodiment of the present invention.
When the jacket-type support structure is applied as the body 2, a jacket column of the body 2 is used as a support §1 to set a foundation part 10 to be vertically upright, and support the foundation pail 10 without installing a separate foundation support device 30 in the body 2.
In the foundation structure 3 of the marine support structure 1 accordingdo the present invention, the typical-shaped support structure including the jacket-type supphig structure as wq| as fie gravity support structure may be widely applied as the body 2, In die description of the foundation structure 3 of the marine support structure 1 aeebrci|g to the fourth embodiment of the present invention, overlapping or corresponding descriptions! related to the foundation structure 3 of the marine support structure 1 according to the first embodiment of the present invention have been omitted. FIG. 16 Is a conceptual view showing a launching step of a method of installing a marine support structure according to one embodiment of the present invention, FIG. 17 is a conceptual view showing a ioaiag transfer step of the method of installing a marine support structure according to one embodiment of the present invention, and FIG. 18 is a conceptual view showing an unlocking step of the method of installing a marine support structure according to one embodiment of the present invention, FIG. 19 is a conceptual view showing a state beteeta founiaios structure is rotated downward in a foundation pgrt changing step of the method of installing a marine support structure according to one embodiment of the present invention, and FIG, .20 is a conceptual view showing a state in which the foundation structure |s rotated downward in the foundation part changing step of the method of installing a marine support structure according to one embodiment of the present invention* FIG. il is a conceptual view showing a state before the foundation structure is mounted in a foundation mounting step of the method of installing a marine support structure according to one embodiment of the present invehlon, FIG. 22 is a conceptual view showing a state in which the foundation structure is mounted in the foundation mounting step of the method of installing a marine: support structure according to one embodiment of the present invention, and BIG. 23 is a conceptual view showing an installation step of the method of Installing a marine support structure according to one embodiment of the present invention. FIG. 24 is a free body diagram showing a force applied to the foundatfonpaal in the launching step and the floating transfer step of the method of installing M marine support structure according to one embodiment of the present invention, FIG. 25 is a free body diagram showing a force applied to the foundation part before the foundation part is rotated in the foundation part changing step of foe method of installing: a marine support structure according to one embodiment of the present invention, FIG, 26 is a free body diagram showing a force applied to the foundation part at the: beginning of the rotation of the foundation part in the fotmlation part changing step of the method of installing a marine support structure according to one embodiment of the present invention, and FIG, 27 is a free body diagram showing a force applied to foe foundation part at the end of the rotation of the foundation part in the foundation part changing step of the method of installing a marine support structure according to one embodiment of the present invention. FIG. 28 is a free body diagram showing a force applied to foe foundation part before the foundation part is mounted in the foundation mounting step of the method of installing a marine support structure according to one embodiment of the present invention, and Flu. 20 is a; fee body diagram showing, a force applied to the foundation part after tire foundation part is mounted in the foundation part mounting stpp of the method of installing a marine support structure according to one embodiment of the present invention. 4: method of installing m marine support structure according:: to one: embodiment of the present invention relates to a method of installing the matins support structure:: I using the variable foundation structure 3 of the marine support structure 1 according to the first embodiment of the present invention. The method; of installing a marine support structure according to one embodiment of the present invention includes a launching step (SI) for launching the marine support structure 1 when the open part 14 of the foundation part 10 installed on the body 1 of the marine support structure 1 is positioned above a water line and rotation of the foundation pari 10 is locked, a float-transferring step (S2) for floating fpmsferring the marine support structure 1 to a required offshore position, an unlocking step (S3) of unlocking the rotation, of the foundation part 10 when the marine support structure 1 approaches a targeted position, a foundation pa a changing step fS4) for rotating the foundation part 10 downward while introducing seawater into the foundation part 10, a foundation mounting step (S5) for mounting the foundation part 10 at a lower portion of the body 2 -while rotating the foundatibi part 10, and an installation step (S6) of submerging and installing the marine support; structure 1.
The launching step ($2) sequentially includes a setting step (SI-1) for controlling a rotation angle of the foundation part 10 so that the open part 14 is positioned at an upper portion of the foundation part 10, and a rotation locking step (SI-2) for locking the rotation of the foundation part 10 by fastening the foundation part 10 lo a side part of the body 2, arid then Ire.....marine support structure I is launched in a harbor, as shown in FIG. Ip || the setting step (Si-]), an angle of the foundation part 10 is controlled so that an open part 21a is positioned above a water line. For example, while the foundation part 10 is vertically upright, as shown in FIG.l, the open part 14 is: positioned at the top of the foundation part 10, and the open part 14 is positioned above a surface of the sea. Setting the foundation part 10 at a predetermined angle, for example setting the foundation part 10 to be vertically upright, may be easily performed by connecting the foundation part 10 to the support 31 of the foundation support device 30 formed to vertically extend,
In the rotation locking step (S1-2), since lire connection member 33, such, as a loop, connected to the foundation pari 10 is fastened to die fastening device 32 of the foundation support device >0, the rotation of the foundation part 10 is locked, Since the fastening dUie© 32 locks the rotation of the foundation part 10, counterclockwise rotaliia Of the foundation part 10 may be stably locked in launching and float-transferring processes in a harbor, ftagfore, when launching is performed while the foundation part 10 is set to be vertically upright, moment for rotating the foundation part 10 about the foundation connection part 20 as a center of clockwise rotation thereof is applied to the foundation phrt ffl, as shown in FIG, 14.
As shown in FIGS. 24 to 29, W refas to: gravity of the foundation part 10, M refers to a moment applied to the foundation connection part 2(), e refers to eccentricity of gravity, 0 refers to an angular displacement of the foundation part 10, B refers to buoyancy applied to the foundation part 10, co refers to an angular speed of the foundation part 10, D refers to drag generated when the: foundation part 10 is rotai&l α refers to an angular acceleration of the foundation part 10, anil, refers to a ppulsive force generated by die shock absorbing device.
In this ease, a water line of the marine support structure 1 is further lowered by buoyancy, and launching can fee perfouned in a harbor in which a water level is low. Also, as a seawater projection area of the marine support structure: 1 is: reduced by buoyancy being applied to the foundation part 10, the drag applied to the marine support structure 1 Is reduced, and then a dragging force is further reduced when the marine support structure 1 floats and is transferred to a required offshore pdsifferi of deep seawater rasing a tugboat, as shown in FIGS. 16 to 18, in the float-transferring step (S2j such that transfer performance of the marine snppsl structure 1 may be further increased.
The unlocking step (S3) is a process of unlocking the rotation of the foundation pat! fp when, the marine support structure 1 ii|>proaches the tergeted. position, as shown in FIG. 18, The connection: member 33 is unfastened from the fastening device 32 of the foundation support device 30, and thus the unlocking may be performed,
The foundation part changing step (S4) includes a seawater injection step (S4-1) for rotating the foundation part 10 downward while seawater is injected into the foundation part 10 when the rotation of the foundation part 10 is unlocked, and a foundation psrtrsubmerging step (S4-2) for continuing to rotate the foundation part 10 while fhs seawater is introduced into the foundation part 10 through the open part 14.
The sea water injection step (S4--1) is a process of rotating the foundation part 10 downward by injecting seawater info the foundation part 10, as shown in FIG. 25, while the foundation part 10 is vertically upright, as shown in FIG. 19. In the seawater injection step (S4-1), the weight of the foundation part 10 is gradually increased while the seawater is injected into tie foundation part 10 using the pump fl,:: lihen t|e weight of the foundation part 10 is increased to be greater than the buoyancy applied to the foundation part 10, a moment to rotate the: foundation part If about the foundation connection part 20 te a counter-clockwise direction m applied to the foundation part 10, as shown in FIG. 25, and a tfotfote^elockwise rotation is started. When it is necessary to reduce the angular speed of the; foundation part 10 due to rotational angular .speed being faster than a reference value or for another reason, the seawater is discharged using the pump 15, and thus a clockwise moment may be introduced into the foundation part 10,
The foundation pat! submerging step (S4-2) includes a process ism a point of tune at which die ooen Dart 14 of the foundation Dart 10 comes into contact with a Λ: A·: the seawater, as shown in FIG. 20, to a point of time at which tip foundation part 1() is completely submerged in the seawater, as blown in FIG. 21.
In the foundation part submerging step (S4-2), the counter-clockwise rotation of the foundation part 10 is maintained while the seawater is introduced iirough the open part 14, as shown in FIGS. 26 and ill In this case, the angular speed of the foundation part 10 may be controlled using the pump 15. The Seawater is continuously introduced into the foundation part 10 during the foundation Submerging; step (54-2): and the buoyancy of the foundation part TO is reduced, and thus the water line of the marine support structure 1 gradually gets higher.
The foundation part mounting step (S5) includes a rotating and mounting step (S5-1) of continuously rotating th| foundation part 10 until the foundation part 10 is mounted at a lo wer part of the body 2, and a fixing step (S5-2) of locking the rotation of the foundation part 10 when the foundation part 10 is mounted at the lower part of the body 2, T he rotating and mounting step (S5-1) is a process of continuing to rotate the foundation part 10 when the body connection part 13 of the foundation part 10 or the shock absorbing device 40 installed in the body connection part 13 comes into contact with a lower surface of the body 2, as shown in FIG. 21, and drag facing the foundation part 10 is applied thereto from the lower surface of the body 2.
The shock absorbing device 40 installed in the body connection part 13 of the foundation part 10 conies into contact with the lower surface of the body 2 when the foundation part 10 gets closer to the lower part of the body 2, and in this state, when the foundation pat! 10 is further rotated in the counter-clockwise dlneeion, a repulsive truce to disturb the counter-clockwise rotation of the foundation f art 10 is generated while the shock absorbing device 40 is Compressed, ϋι this case, the shock absorbing device 40 is located to the right of the foundation connection part 20, which is the center of rotation of the foundation part 10, and a eioekwisempmeii is applied to the foundation part 10, and tins a speed of the counter-clockwise rotation of the foundation part 10 :s reduced. A rotation speed of the foundation pari 10 is gradually reduced while the clockwise moment is gradually increased usrng a shock-absorbing force of the shock absorbing device 1¾ and the body connection part 13 of the foundation part 10 is more stably mounted; on the lower surface of the body 2 without a sharp: shock; Also, the shock absorbing device 40 basically absorbs a shock and prevents direct corrosion between the body 2 and the foundation part 10 made with a rigid body as well as perforihi a function of applying a repulsive force to the foundation part 10.
When the foundation part 10 rotates in the counter-clockwise direction and is completely overturned, as shown in FIG. 22, no further rotating force is applied t| the foundation part 10, as shown in FIG. 29.
The fixing step (S5-2), which is a process of fixing the foundation part 10 to the body 2 by locking the rotation of the foundation part 10 when the foundation part 10 is mounted on the lower portion of the body 2, is performed through a process in iwhich the rotary fixture 35 is inserted into the space part 34 formed between tie body 2 and the foundation connection part 20. The filing step (S5-2) prevents th# foundation part 10 from being randomly rotated and stably maintains a state in which the foundation part 10 is mounted on the lower surface: of the body 2, and a function of supporting the body 2 and marine equipment iisi stably performed while the foundation part 10 is installed on the sea bed, as shown in FIG. 23.
According to the variable foundation structure 3 of the marine support structure 1 according to the present invention having the above configuration and the method of installing the marine suppori steefure 1 using the same, the water line of the marine support structure 1 is further lowered using buoyancy applied to the foundation part 10 when seawater is not introduced into the foundation part. 10, and drag applied to the marine support structure may be reduced by reducing a projected arid If seawater. Therefore, the launching is performed in a harbor at a depth of water shallower than that of deep seawater in which the marine support structure 1 is installed, and the marine support structure 1 may he easily fioafrtrtsnsforrcd to a required offshore position by less towing force.
Jd#x according to the present invention, the foundation part 10 is rotated downward toward the lower portion of the body 2 from a connection part with the founiahon connection part 20 by infroducing seawater· into the foundation part 10 to increase the weight of the foimdidion part 10, and thus the marine support structure 1 may be easily and rigidly self-installed at a required offshore position by the foundation pari 10 while a position and disposition of the foundation part 10 are changed,
The present invention has been described with reference to the examplp ilfoitfited in the drawings, but these are only exemplary examples. It should be understood |y those skilled in the art that various modifications and equivalent other examples may he made, Tisereferel the scope of the present invention: is defined by the appended claims.
Claims (1)
- [CLAIMS] [ Claim I] Λ variable foundation structure of a marine support structure, the structure comprising; a foundation part installed on a body of a marine support structure, having a containing part configured to contain seawater, and configured to support the body when installed on a sealed; and M foundation connection part configured to ^tatably connect the foundation part to the body, [Claim 2], "fire structure of claim 1, wherein the foundation part includes: a foundation body part having the containing part; a body connection part configured to close one side part of the foundation body part, connected to the foundation connection pari, positioned at a lower part of the foundation body part when the marine support structure is being float-transferred, and positioned at an upper portion of the foundation body part when the marine support structure is being installed; and an open part configured to open the other side part of the foundation body part and moved under a seawater surface when the foundation body part rotates; downward so that seawater ts introduced into the foundation body part. I Claim 31 The structure of claim 2, wherein the foundation part further includes a pump configured to control an amount of seawater contained in the foundation body pari, [Claim 4] The structure of claim 1, wherein the foundation connection part includes a pin joint installed in the body and configured to support the foundation part to be vertically rotatable. [Ollhill The structure of claim 4, wherein the pin joint includes: a fixing connection part formed in the body; a rotary connection part formed in the foundation part and disposed to be adjacent ten the fixing connection part; and a rotating shaft part configured to rotatably fasten the rotary connection part to the fixing connection part. [Claim 11 The structure of claim1, wherein the foundation connection pari, includes a link device installed in the body and configured to support the foundation part to be vertically rotatable. [Claim 7] The structure of claim 6, wherein the link device includes: m first link having one end rotatably connected to the body and coupled with the foundation part; a second link connected to the other end of the first link; and a third link having one end connected to the second link and the other end rotatably connected to the body above the first link. [Claim 8] ’file structure of claim Ϊ, further- comprising a foundation support device installed in the body and configured to support die foundation part at a predetermined angle. [Claim 9] The structure of claim 8, the foundation support device includes: a support installed to vertically extend from the body and configured to be in contact with a side part of the 'foundat ion part; and a fastening device installed in lie support and fastened to the connection member connected to the foundation part, [Claim 10] The structure of claim 8, wherein the foundation support device further includes: a rotary fixture inserted into a space part formed between; a side part of the body, the foundation part, and the foundation connection part whih tie fpfihdiion part is rotate# downward and configured to lock the rotation of the foundation part. [Claim 11] The structure of claim 10, wherein the rotary fixture includes: a fiilt contact part having a shape corresponding to: one side of the body to face the foundation connection part; and a second contact part having a shape corresponding to the one side of the-foun^onj:#miection::ffg| fo face the body and having a wedge shape with the first contact part. [Claim 12] The structure of claim 1, further comprising: a shock absorbing device installed on the foundation part or a lower part of the body and configured to absorb a shock applied to the body and the foundation past when the: foundation part is rotated. [Claim 13] The structure of claim 12, wherein the shock absorbing device includes a tube made of nun-metaf eiasieimaterial. [Claim 14] A method of installing a marine support structure includes: a launching step of positioning an open part of a foundation part installed om; a body of a marine support: structure above a water line and performing launching when a rotation of the foundation part is locked; a floatriransferring step of float-transferring the marine support structure to a required offshore position; an unlocking step of unlotiiig: the rotation of the foundation part when the marine support structure approaches a required position; a foundation, part changing step of rotating the: foundation pari: downward while seawater is introduced into the foundation part; a foundation part mounting step of mounting the foundation piri af i lowir portipi of fob body while continuing to rotate the foundation part; and andnsiallation step of submerging and installing the marine support structure. [Claim 15] The method of claim 14, wherein foeTaunchingstep includes: a setting step of controlling a rotation angle of the foundation part so that the open part is petitioned at an upper portion of the foundation part; and a rotation locking step of locking the rotation of the foundation part by fastening the foundation part to tire body. I Claim 16] The melltod of claim f% wherein the foundation part-changing step includes: a seawater injection step of rotaing the foundation part downward; while injecting seawater into the foundation part; and a foundation part installing step of continuing to rotate the; foundation part while the seawater is introduced into the foundation part ttoBugh the open part. [Claim 17] The method of claim M, wherein the foundation mounting step includes: a rotating and mounting step of cominsm| to rotate the foundation part until the foundation part is mounted at a lower portion of the body; and a fixing step of locking the rotation of the foundation part: when the foundation part is mounted on the lower portion of the body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150163803A KR101866972B1 (en) | 2015-11-23 | 2015-11-23 | Variable foundation structure of offshore support structure and construction method of offshore support structure thereof |
| PCT/KR2016/009564 WO2017090867A1 (en) | 2015-11-23 | 2016-08-29 | Variable foundation structure of marine support structure and method for installing marine support structure, using same |
Publications (3)
| Publication Number | Publication Date |
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| GB201717289D0 GB201717289D0 (en) | 2017-12-06 |
| GB2554246A true GB2554246A (en) | 2018-03-28 |
| GB2554246B GB2554246B (en) | 2021-06-02 |
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| GB1717289.1A Active GB2554246B (en) | 2015-11-23 | 2016-08-29 | Variable foundation structure of marine support structure and method for installing marine support structure, using same |
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| Country | Link |
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| KR (1) | KR101866972B1 (en) |
| DE (1) | DE112016005356B4 (en) |
| GB (1) | GB2554246B (en) |
| WO (1) | WO2017090867A1 (en) |
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| KR101399983B1 (en) * | 2008-06-20 | 2014-05-27 | 씨타워 에이에스 | Support structure for use in the offshore wind farm industry |
| JP2015004351A (en) * | 2013-06-24 | 2015-01-08 | 新日鉄住金エンジニアリング株式会社 | Foundation apex of offshore wind turbine generator system and foundation structure member of offshore wind turbine generator system |
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| JP2007092406A (en) * | 2005-09-29 | 2007-04-12 | Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co Ltd | Foundation structure for on-water structure |
| FR2949482B1 (en) * | 2009-08-28 | 2011-08-26 | Technip France | SUPPORT FOUNDATION FOR A HYDROLIENNE, SUBAQUATIC DEVICE AND METHOD OF PLACING THE SAME. |
| KR101177395B1 (en) * | 2012-02-06 | 2012-08-27 | 주식회사 언딘 | Apparatus and method for installing sub-structure of ocean tidal current power or offshore wind power turbines |
| KR200477410Y1 (en) * | 2013-04-26 | 2015-06-05 | 대우조선해양 주식회사 | Diverter housing and marine structure having the same |
| KR101529097B1 (en) * | 2013-05-02 | 2015-06-16 | 한국건설기술연구원 | Large diameter steel-pipe pile of reclamation type for offshore wind generation, and constructing method thereof |
| KR101597592B1 (en) * | 2013-12-18 | 2016-03-07 | 대우조선해양 주식회사 | Structural safety of offshore structures based on descent apparatus |
| KR101554939B1 (en) * | 2014-12-08 | 2015-09-22 | (주)대우건설 | Suction pile substructure and constructing method using thereof |
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2015
- 2015-11-23 KR KR1020150163803A patent/KR101866972B1/en active IP Right Grant
-
2016
- 2016-08-29 WO PCT/KR2016/009564 patent/WO2017090867A1/en active Application Filing
- 2016-08-29 GB GB1717289.1A patent/GB2554246B/en active Active
- 2016-08-29 DE DE112016005356.8T patent/DE112016005356B4/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101399983B1 (en) * | 2008-06-20 | 2014-05-27 | 씨타워 에이에스 | Support structure for use in the offshore wind farm industry |
| KR101352096B1 (en) * | 2012-05-21 | 2014-01-15 | 재단법인 포항산업과학연구원 | Tripod suction pile substructure |
| KR101346225B1 (en) * | 2012-06-28 | 2014-01-10 | 삼성중공업 주식회사 | Floating structure |
| JP2015004351A (en) * | 2013-06-24 | 2015-01-08 | 新日鉄住金エンジニアリング株式会社 | Foundation apex of offshore wind turbine generator system and foundation structure member of offshore wind turbine generator system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201717289D0 (en) | 2017-12-06 |
| KR20170059630A (en) | 2017-05-31 |
| DE112016005356B4 (en) | 2024-02-22 |
| GB2554246B (en) | 2021-06-02 |
| KR101866972B1 (en) | 2018-06-14 |
| WO2017090867A1 (en) | 2017-06-01 |
| DE112016005356T5 (en) | 2018-08-16 |
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