WO2010024685A1 - Floating structure of concrete - Google Patents

Floating structure of concrete Download PDF

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Publication number
WO2010024685A1
WO2010024685A1 PCT/NO2009/000295 NO2009000295W WO2010024685A1 WO 2010024685 A1 WO2010024685 A1 WO 2010024685A1 NO 2009000295 W NO2009000295 W NO 2009000295W WO 2010024685 A1 WO2010024685 A1 WO 2010024685A1
Authority
WO
WIPO (PCT)
Prior art keywords
floating structure
floating
shell structure
shaped shell
walls
Prior art date
Application number
PCT/NO2009/000295
Other languages
French (fr)
Other versions
WO2010024685A8 (en
Inventor
Arnstein Godejord
Original Assignee
Dr. Tech. Olav Olsen As
Mpu Enterprise As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr. Tech. Olav Olsen As, Mpu Enterprise As filed Critical Dr. Tech. Olav Olsen As
Priority to AU2009286256A priority Critical patent/AU2009286256B2/en
Priority to BRPI0917918 priority patent/BRPI0917918B1/en
Publication of WO2010024685A1 publication Critical patent/WO2010024685A1/en
Publication of WO2010024685A8 publication Critical patent/WO2010024685A8/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B5/00—Hulls characterised by their construction of non-metallic material
    • B63B5/14—Hulls characterised by their construction of non-metallic material made predominantly of concrete, e.g. reinforced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/041—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with disk-shaped hull
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/16—Shells
    • B63B3/20—Shells of double type

Definitions

  • the present invention concerns a floating concrete structure, preferably for storing oil.
  • the floating structure can also in addition to be an oil storage be provided with for example oil and gas processing equipment and thus function as an offshore floating oil and gas platform.
  • the structure can also function as a floating body alone, accordingly without storage function.
  • NO 147591 B describes a device in the form of a floating body which is formed to reduce pitching, rolling and submerging of the body.
  • the body which can be a floating platform or an oil storage, can be formed as an annulus.
  • the body is formed with an internal closed ring where the stored material can float freely.
  • the annulus itself is encircled by a cylindrical wall extending above the water surface and also down below the water surface.
  • substantially vertical downwardly open and in other respect closed chambers are provided which in the floating condition are completely filled with water, whereby the mass of inertia of the body is changed.
  • NO 320663 B1 describes a floating cylindrical oil storage having a cylindrical centre section and tank sections which all are connected to the central section containing pipe systems.
  • the object of this structure is mainly to optimise the pipe system connecting the tanks in a tank arrangement of this particular type.
  • An object of the present invention is to provide a concrete oil storage which can be constructed based on effective construction methods and hence is economical competitive with today solutions.
  • Another object is that the floating structure shall exhibit good hydrodynamic characteristics under all sea conditions. In this connection it is important to avoid that the period for heave and pitch (accordingly vertical movement and rotation) respectively is not to strongly connected together such that these movements are increased.
  • the floating structure is provided with a favourably shape with regard to strength such that for example differential pressures acting on walls are relatively low.
  • the floating structure shall be flexible, i.e. in addition to be an oil storage it shall also in a simple way could be provided with required equipment and this function as an offshore oil and gas platform.
  • a floating concrete structure preferably for storing oil, characterized by comprising a substantially torus shaped shell structure having internal radial walls and a upwardly and downwardly curved dome shaped shell structure closing the open centre area of the substantially torus shaped shell structure, above and below, respectively.
  • figure 1 depicts a floating structure according to the invention having a deck structure mounted on
  • figure 2 depicts a floating structure of figure 2, but now with a part of the upper shell structure removed.
  • the floating structure is here shown without the deck structure
  • figure 3 depicts a plan view of the floating structure
  • figure 4 depicts a front view of the floating structure in a operational phase with empty tanks
  • figure 5 depicts a floating structure now in a operational phase with full tanks
  • figure 6 depicts a plan view of the floating structure where the internal tanks having another form than in figure 3.
  • a floating structure 1 of concrete is shown.
  • the structure 1 includes storage tanks for oil and is shown with a possible deck structure in figure 1.
  • the floating structure 1 has a torus shaped shell structure 2 which in the shown embodiment is substantially ring formed with an outer and inner cylindrical wall 3, 5.
  • the outer and inner cylindrical walls 3, 5 are in their upper area connected to a upwardly curved torus part 10 and in the lower area connected with a downwardly curved torus part 11 thus closing the torus formed shell structure 2.
  • the substantially torus shaped shell structure 2 is provided with internal radial walls 15, and in this connection references are particularly made to figure 2 and 3.
  • the torus shaped shell structure 2 is provided with a upwardly and downwardly curved dome formed shell structure 7, 8 closing the open centre area of the substantially torus shaped shell structure, above (in the upper parts) and below (in
  • the outer cylindrical wall 3 of the shown embodiment has a double shape including transversal bulk heads 4. It should in this connection be mentioned that double hulls are required for such installations.
  • the double shape of the wall 3 provides chambers which for example can be ballasted in order to adjust theo freeboard of the floating structure during different operational conditions.
  • the internal radial walls 15 have a height equal to the outer and inner cylindrical walls 3, 5. It should be mentioned that the internal radial walls 15 either can start higher up or end lower down.
  • the main object of the radial walls 15 is to provide global stiffness and to prevent "splashing" within the5 storage volume.
  • the radial walls 15 are provided with internal transversal bulk heads 16.
  • Figure 6 depicts another embodiment of the internal radial walls 15 which also here has a double shape with a first and a second wall 17, 18.
  • the walls 17, 18 are curved in each direction in relation to a radial centre axis 20.
  • the internal radial walls can also be provided with throughgoing openings.
  • the geometrical form of the floating structure 1 is a result of a number of design criteria as for example requirement to: stability, strength with regard to acting water pressure etc., safety with regard to collision from for example ship, minimal weight and draft and effective construction methods as for example tunnel5 formwork, slip casting, prefabrication of segments etc.
  • a floating structure 1 consisting of a substantially torus formed shell structure 2 having a upwardly and downwardly curved dome shaped shell structure 7, 8 or spherical shell closing the open centre area, above and below, respectively of theo substantially torus formed shell structure.
  • radial walls 15 are provided which take care of "sloshing-forces" and ensure global stiffness and strength.
  • the internal radial walls 15 terminate at lower and upper ring beam elevation, such that oil freely flows under the walls inside the torus form.
  • the solution of the torus shape and the radial walls 15 extending not completely down allows the fluid to freely flow in the bottom of the tank such that the complete volume is to be regarded as a large tank (free liquid surface).
  • This provides the floating structure 1 with an acceptable relation between natural period for vertical movement and rotation in floating condition whereby hydrodynamic problems are avoided and good stability is achieved.
  • the geometrical form of the floating structure 1 with the different shell formed domes, torus and cylinders takes care of the water pressure in an effective way. Further, a very simple rotational symmetrical load distribution is achieved and accordingly reinforcing arrangement which results in a cost effective manufacture of the floating structure 1.
  • Figure 4 depicts the floating structure 1 in an operational condition with empty internal storage tanks. With regard to stability of the floating structure 1 the internal storage tanks will be filled with liquid up to the shown level.
  • Figure 5 depicts the floating structure 1 in a operational condition with full internal storage tanks.
  • the floating structure 1 floats high in the water when the internal storages are empty and lower in the water when the internal storages are filled up. In both cases the differential pressures across the walls are relative minor.
  • floating structure 1 An embodiment of the floating structure 1 is discussed above, but it should be understood that the floating structure may have other forms, for example a
  • the internal radial walls may also have another form than in the shown embodiment.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

Floating concrete structure (1), preferably for storing oil, comprising a substantially torus shaped shell structure (2) having internal radial walls (15) and a upwardly and downwardly curved dome shaped shell structure (7, 8) closing the open centre area of the substantially torus shaped shell structure, above and below, respectively.

Description

Floating concrete structure
The present invention concerns a floating concrete structure, preferably for storing oil. The floating structure can also in addition to be an oil storage be provided with for example oil and gas processing equipment and thus function as an offshore floating oil and gas platform. The structure can also function as a floating body alone, accordingly without storage function.
NO 147591 B describes a device in the form of a floating body which is formed to reduce pitching, rolling and submerging of the body. The body which can be a floating platform or an oil storage, can be formed as an annulus. The body is formed with an internal closed ring where the stored material can float freely. The annulus itself is encircled by a cylindrical wall extending above the water surface and also down below the water surface. In the bottom of the floating body substantially vertical, downwardly open and in other respect closed chambers are provided which in the floating condition are completely filled with water, whereby the mass of inertia of the body is changed.
NO 320663 B1 describes a floating cylindrical oil storage having a cylindrical centre section and tank sections which all are connected to the central section containing pipe systems. The object of this structure is mainly to optimise the pipe system connecting the tanks in a tank arrangement of this particular type. An object of the present invention is to provide a concrete oil storage which can be constructed based on effective construction methods and hence is economical competitive with today solutions. Another object is that the floating structure shall exhibit good hydrodynamic characteristics under all sea conditions. In this connection it is important to avoid that the period for heave and pitch (accordingly vertical movement and rotation) respectively is not to strongly connected together such that these movements are increased. A further object is that the floating structure is provided with a favourably shape with regard to strength such that for example differential pressures acting on walls are relatively low. Another object is that the floating structure shall be flexible, i.e. in addition to be an oil storage it shall also in a simple way could be provided with required equipment and this function as an offshore oil and gas platform.
The objects of the present invention are achieved by a floating concrete structure preferably for storing oil, characterized by comprising a substantially torus shaped shell structure having internal radial walls and a upwardly and downwardly curved dome shaped shell structure closing the open centre area of the substantially torus shaped shell structure, above and below, respectively.
Preferred embodiments of the floating structure is further described in the claims 2 - 8.
A preferred embodiment of the invention shall now be explained with reference to the attached drawings, where figure 1 depicts a floating structure according to the invention having a deck structure mounted on, figure 2 depicts a floating structure of figure 2, but now with a part of the upper shell structure removed. The floating structure is here shown without the deck structure, figure 3 depicts a plan view of the floating structure, figure 4 depicts a front view of the floating structure in a operational phase with empty tanks, figure 5 depicts a floating structure now in a operational phase with full tanks and figure 6 depicts a plan view of the floating structure where the internal tanks having another form than in figure 3. With reference to the figures a floating structure 1 of concrete is shown. The structure 1 includes storage tanks for oil and is shown with a possible deck structure in figure 1.
The floating structure 1 has a torus shaped shell structure 2 which in the shown embodiment is substantially ring formed with an outer and inner cylindrical wall 3, 5. The outer and inner cylindrical walls 3, 5 are in their upper area connected to a upwardly curved torus part 10 and in the lower area connected with a downwardly curved torus part 11 thus closing the torus formed shell structure 2. The substantially torus shaped shell structure 2 is provided with internal radial walls 15, and in this connection references are particularly made to figure 2 and 3. The torus shaped shell structure 2 is provided with a upwardly and downwardly curved dome formed shell structure 7, 8 closing the open centre area of the substantially torus shaped shell structure, above (in the upper parts) and below (in
5 the lower parts), respectively.
The outer cylindrical wall 3 of the shown embodiment has a double shape including transversal bulk heads 4. It should in this connection be mentioned that double hulls are required for such installations. The double shape of the wall 3 provides chambers which for example can be ballasted in order to adjust theo freeboard of the floating structure during different operational conditions.
In the depicted embodiment the internal radial walls 15 have a height equal to the outer and inner cylindrical walls 3, 5. It should be mentioned that the internal radial walls 15 either can start higher up or end lower down. The main object of the radial walls 15 is to provide global stiffness and to prevent "splashing" within the5 storage volume. The radial walls 15 are provided with internal transversal bulk heads 16.
Figure 6 depicts another embodiment of the internal radial walls 15 which also here has a double shape with a first and a second wall 17, 18. The walls 17, 18 are curved in each direction in relation to a radial centre axis 20. o The internal radial walls can also be provided with throughgoing openings.
The geometrical form of the floating structure 1 is a result of a number of design criteria as for example requirement to: stability, strength with regard to acting water pressure etc., safety with regard to collision from for example ship, minimal weight and draft and effective construction methods as for example tunnel5 formwork, slip casting, prefabrication of segments etc.
On the basis of the above discussed criteria the optimum solution is a floating structure 1 consisting of a substantially torus formed shell structure 2 having a upwardly and downwardly curved dome shaped shell structure 7, 8 or spherical shell closing the open centre area, above and below, respectively of theo substantially torus formed shell structure. Inside the storage itself radial walls 15 are provided which take care of "sloshing-forces" and ensure global stiffness and strength. In the shown embodiment the internal radial walls 15 terminate at lower and upper ring beam elevation, such that oil freely flows under the walls inside the torus form. The solution of the torus shape and the radial walls 15 extending not completely down allows the fluid to freely flow in the bottom of the tank such that the complete volume is to be regarded as a large tank (free liquid surface). This provides the floating structure 1 with an acceptable relation between natural period for vertical movement and rotation in floating condition whereby hydrodynamic problems are avoided and good stability is achieved. The geometrical form of the floating structure 1 with the different shell formed domes, torus and cylinders takes care of the water pressure in an effective way. Further, a very simple rotational symmetrical load distribution is achieved and accordingly reinforcing arrangement which results in a cost effective manufacture of the floating structure 1.
Figure 4 depicts the floating structure 1 in an operational condition with empty internal storage tanks. With regard to stability of the floating structure 1 the internal storage tanks will be filled with liquid up to the shown level.
Figure 5 depicts the floating structure 1 in a operational condition with full internal storage tanks.
The floating structure 1 floats high in the water when the internal storages are empty and lower in the water when the internal storages are filled up. In both cases the differential pressures across the walls are relative minor.
An embodiment of the floating structure 1 is discussed above, but it should be understood that the floating structure may have other forms, for example a
"more complete" torus shaped shell structure 2 without the outer and inner vertical walls is possible. The internal radial walls may also have another form than in the shown embodiment.

Claims

CLAI M S
5 1. Floating concrete structure (1), preferably for storing oil, characterized by comprising: a substantially torus shaped shell structure (2) having internal radial walls (15) and a upwardly and downwardly curved dome shaped shell structure (7, 8) closing the open centre area of the substantially torus shaped shell structure,o above and below, respectively.
2. Floating structure (1) according to claim 1 , characterized in that the substantially torus shaped shell structure (2) is a substantially ring formed shell structure having an outer and inner cylindrical wall5 (3, 5) connected to a upwardly curved torus part (10) in their upper area and to a downwardly curved torus part (11) in their lower area.
3. Floating structure (1) according to claim 2, cha racterized i n that the outer and inner cylindrical walls (3, 5) are0 vertical.
4. Floating structure (1) according to claims Λ, or 3, characterized in that the internal radial walls (15) having a height equal to the outer and inner cylindrical walls (3, 5). 5
5. Floating structure (1) according to anyone of the preceding claims, characterized in that the internal radial walls (15) having double shape with internal transversal bulk heads (16). o
6. Floating structure (1) according to claims 2, 3, 4 and 5, cha racterized in that the outer cylindrical wall having double shape including transversal bulk heads (4).
7. Floating structure (1) according to claims 1 , 2 or 3, characterized in that each of the internal radial walls (15) having double shape, a first and second wall (17, 18) respectively, where each wall (17, 18) is curved in each direction in relation to a radial centre axis (20).
8. Floating structure (1) according to anyone of the preceding claims, characterized i n that the internal radial walls (15) are provided with throughgoing openings (19).
PCT/NO2009/000295 2008-08-25 2009-08-24 Floating structure of concrete WO2010024685A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2009286256A AU2009286256B2 (en) 2008-08-25 2009-08-24 Floating structure of concrete
BRPI0917918 BRPI0917918B1 (en) 2008-08-25 2009-08-24 floating concrete structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20083648 2008-08-25
NO20083648A NO335458B1 (en) 2008-08-25 2008-08-25 Liquid construction in concrete

Publications (2)

Publication Number Publication Date
WO2010024685A1 true WO2010024685A1 (en) 2010-03-04
WO2010024685A8 WO2010024685A8 (en) 2012-03-15

Family

ID=41721674

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2009/000295 WO2010024685A1 (en) 2008-08-25 2009-08-24 Floating structure of concrete

Country Status (4)

Country Link
AU (1) AU2009286256B2 (en)
BR (1) BRPI0917918B1 (en)
NO (1) NO335458B1 (en)
WO (1) WO2010024685A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014077699A1 (en) * 2012-11-19 2014-05-22 Sevan Marine Asa A vessel tank system
US10065712B2 (en) 2016-12-21 2018-09-04 Exxonmobil Upstream Research Company Floating modular protective harbor structure and method of seasonal service extension of offshore vessels in ice-prone environments
US10309071B2 (en) 2016-12-21 2019-06-04 Exxonmobil Upstream Research Company Floatable modular protective harbor structure and method of seasonal service extension of offshore vessels in ice-prone environments

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106428438A (en) * 2016-09-30 2017-02-22 南通中远船务工程有限公司 Cylindrical floating accommodation platform

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2461462A1 (en) * 1974-12-24 1976-07-01 Dyckerhoff & Widmann Ag FLOATING BODY MADE OF REINFORCED CONCRETE OR REINFORCED CONCRETE
US4155323A (en) * 1976-07-21 1979-05-22 Dyckerhoff & Widmann Aktiengesellschaft Float construction for reducing pitching, rolling or dipping
WO2004080791A1 (en) * 2003-03-14 2004-09-23 Sevan Marine As A tank installation for the storage of liquids

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2461462A1 (en) * 1974-12-24 1976-07-01 Dyckerhoff & Widmann Ag FLOATING BODY MADE OF REINFORCED CONCRETE OR REINFORCED CONCRETE
US4155323A (en) * 1976-07-21 1979-05-22 Dyckerhoff & Widmann Aktiengesellschaft Float construction for reducing pitching, rolling or dipping
WO2004080791A1 (en) * 2003-03-14 2004-09-23 Sevan Marine As A tank installation for the storage of liquids

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014077699A1 (en) * 2012-11-19 2014-05-22 Sevan Marine Asa A vessel tank system
GB2522166A (en) * 2012-11-19 2015-07-15 Sevan Marine Asa A vessel tank system
KR20150086540A (en) * 2012-11-19 2015-07-28 세반 마린 에이에스에이 A vessel tank system
CN104936858A (en) * 2012-11-19 2015-09-23 塞万海洋股份有限公司 A vessel tank system
GB2522166B (en) * 2012-11-19 2019-04-17 Sembcorp Marine Integrated Yard Pte Ltd Tank system for a vesel hull comprising radially divided compartments
KR102130307B1 (en) 2012-11-19 2020-07-09 셈브코프 마린 인터그레이티드 야드 피티이. 리미티드 A vessel tank system
US10065712B2 (en) 2016-12-21 2018-09-04 Exxonmobil Upstream Research Company Floating modular protective harbor structure and method of seasonal service extension of offshore vessels in ice-prone environments
US10309071B2 (en) 2016-12-21 2019-06-04 Exxonmobil Upstream Research Company Floatable modular protective harbor structure and method of seasonal service extension of offshore vessels in ice-prone environments

Also Published As

Publication number Publication date
NO20083648L (en) 2010-02-26
BRPI0917918A2 (en) 2016-07-26
NO335458B1 (en) 2014-12-15
AU2009286256B2 (en) 2013-08-15
AU2009286256A8 (en) 2011-05-12
AU2009286256A1 (en) 2010-03-04
WO2010024685A8 (en) 2012-03-15
BRPI0917918B1 (en) 2019-12-10

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