US3548602A - Device for self-correction of position for semi-submersible platform - Google Patents

Device for self-correction of position for semi-submersible platform Download PDF

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Publication number
US3548602A
US3548602A US815582A US3548602DA US3548602A US 3548602 A US3548602 A US 3548602A US 815582 A US815582 A US 815582A US 3548602D A US3548602D A US 3548602DA US 3548602 A US3548602 A US 3548602A
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United States
Prior art keywords
swell
self
vertical
disc
correction
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Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US815582A
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English (en)
Inventor
Georges Monnereau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale dAutomatisme SA
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Compagnie Generale dAutomatisme SA
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4406—Articulated towers, i.e. substantially floating structures comprising a slender tower-like hull anchored relative to the marine bed by means of a single articulation, e.g. using an articulated bearing
    • 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
    • B63B2001/044—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with a small waterline area compared to total displacement, e.g. of semi-submersible type

Definitions

  • the swell is not the only disturbing element for such platforms, which are also subjected both to the action of the wind and to the action of sea currents.
  • the object of the present invention is to eliminate respectively the drifting of floating platforms and the inclination relative to the vertical of cylindrical structures which are anchored on the sea bed by using a discoidal element having its axis of symmetry coinciding with the axis of the vertical structure and optionally inclinable.
  • a device for self-correction of position according to the invention for a semi-submersible platform mounted on at least one partially submered support of hollow cylindrical form with a vertical axis and having a length substantially greater than the diameter is characterized in that a discoidal element centered on the axis of the cylindrical support is optionally inclinable in accordance with the direction of the swell and submerged in the vicinity of the sea surface level.
  • FIG. 1 shows in horizontal projection, an inclined disc mounted on a vertical cylindrical structure.
  • FIGS. 2 and 3 are partial views, in elevation, in two directions perpendicular to one another, a vertical structure with optionally inclinable disc.
  • FIG. 4 is a diagrammatic view, in elevation, of a platform supported by a single vertical structure with symbolic representation of an inclined disc.
  • FIG. 5 shows in symbolic manner, structures anchored to the bed and inclined by a current and their reutrn to the vertical by means of a suitably inclined disc.
  • the plane inclined disc 1 in FIGS. 1, 2 and 3 is mounted by universal joint means including a ring 2 on the hollow cylindrical structure 3 which has a vertical axis 9.
  • the disc 1 is perforated with a central aperture 4 permitting its free orientation permit-ted by the universal joint type of mounting.
  • the disc 1 is adapted to rotate relative to the ring 2 on the axis 5 common to the two studs 6 fixed to the said ring and on which it is mounted.
  • the ring 2 can rotate about two other studs 7 fixed to the cylindrical structure 3 and define an axis 8 perpendicular to the axis 5, the two axes intersecting on the axis of symmetry 9 of the vertical structure.
  • FIG. 4 the floating platform symbolized by a working stage 10 is mounted on a single vertical cylindrical structure 11 stabilized by a hollow anti-swell disc 12 connected to the cylinder 11 by the chamber 13 serving as a machine room.
  • Columns 14 participate in supporting the platform and columns 15 fixed below the disc 12 serve to support the counter-weight 16 intended to lower the center of gravity of the platform.
  • the inclined disc according to the invention is shown at 17, and mounted with a universal joint type of connection on the cylinder 11 by means of the ring 18 and is submerged in the vicinity of the average surface level 19 of the sea and subjected to the effects of the swell which has a sinusoidal profile 20 at the surface.
  • the inclined disc is sensitive to the swell and accepts a proportion of the energy thereof to effect either the displacement of the latter if there is no current or the annulling of its displacement in the case of drift.
  • the inclined disc 17 is shown in circular form, with elliptical projection on any plane forming an angle with its own plane; but it has been found on models, that the effect of the swell can be accentuated by increasing the dimensions thereof in accordance with the inclination, that is to say the greater inclination.
  • an elliptical-section disc the minor axis of the ellipse remaining horizontal and the major axis being arranged in accordance with the greater inclination.
  • a rectangular profile may be chosen for the disc 17, the longest side of the rectangle being arranged in accordance with the inclination.
  • the center of the profile selected, about which the universal joint connection allows the disc 17 to pivot should be situated on the axis of symmetry 25 of the cylindrical structure 11 of the floating platform in order to prevent any asymmetrical reaction of the swell.
  • the discoidal element Owing to the discoidal element according to the invention, it is possible to return the oblique structure to the vertical by the action of the swell on the suitably arranged element.
  • the discoidal element When the swell is directed in accordance with arrow 31, the discoidal element is inclined as shown by the symbolic line 32 and permits returning of the structure from the oblique position 29 to the vertical position 26.
  • the structure in the oblique position 30 is returned to the vertical position 26 when, with the swell in the direction of the broken-line arrow 33, the discoidal element is placed in an inclined position 34 as shown in broken lines. Indeed, if it is arranged that the perpendicular to the plane of the discoidal element is directed towards the surface of the sea, the average level of which is 19, the cylindrical surface supporting it tends to be displaced in the direction of the horizontal projection of the directed perpendicular. In addition the oscillations of the structure returned to the vertical are reduced relative to oscillations in the oblique position.
  • a device for self-correction of position for semisubmersible platform mounted on at least one partly submerged support of hollow cylindrical form with a vertical axis and having a length substantially greater than the 4 diameter, said devcie comprising a discoidal element centered on the axis of the said cylindrical support and optionally inclinable in accordance with the direction of the swell and submerged in the vicinity of the surface level of the sea.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Earth Drilling (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
US815582A 1968-04-12 1969-04-14 Device for self-correction of position for semi-submersible platform Expired - Lifetime US3548602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR148097 1968-04-12

Publications (1)

Publication Number Publication Date
US3548602A true US3548602A (en) 1970-12-22

Family

ID=8648966

Family Applications (1)

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US815582A Expired - Lifetime US3548602A (en) 1968-04-12 1969-04-14 Device for self-correction of position for semi-submersible platform

Country Status (8)

Country Link
US (1) US3548602A (fr)
BE (1) BE730936A (fr)
DE (1) DE1918538A1 (fr)
ES (1) ES365949A1 (fr)
FR (1) FR1583505A (fr)
GB (1) GB1250098A (fr)
LU (1) LU58376A1 (fr)
NL (1) NL6905190A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800347A (en) * 1972-02-29 1974-04-02 B Zuurbier Spar-type buoy for maritime navigation
US3925997A (en) * 1972-06-13 1975-12-16 Selmer As Ing F Breakwater device for offshore submerged foundation structures
US5722797A (en) * 1996-02-21 1998-03-03 Deep Oil Technology, Inc. Floating caisson for offshore production and drilling
CN109631845A (zh) * 2018-11-16 2019-04-16 浙江海洋大学 海洋平台倾斜观察设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897654A (en) * 1949-04-22 1959-08-04 Frederic R Harris Inc Piles for marine structures
FR1510937A (fr) * 1966-11-30 1968-01-26 Automatisme Cie Gle Perfectionnement aux plateformes flottantes
US3390654A (en) * 1967-03-27 1968-07-02 Automatic Drilling Mach Stabilized offshore drilling apparatus
US3407767A (en) * 1966-09-22 1968-10-29 Pike Corp Of America Stabilized floating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897654A (en) * 1949-04-22 1959-08-04 Frederic R Harris Inc Piles for marine structures
US3407767A (en) * 1966-09-22 1968-10-29 Pike Corp Of America Stabilized floating apparatus
FR1510937A (fr) * 1966-11-30 1968-01-26 Automatisme Cie Gle Perfectionnement aux plateformes flottantes
US3390654A (en) * 1967-03-27 1968-07-02 Automatic Drilling Mach Stabilized offshore drilling apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800347A (en) * 1972-02-29 1974-04-02 B Zuurbier Spar-type buoy for maritime navigation
US3925997A (en) * 1972-06-13 1975-12-16 Selmer As Ing F Breakwater device for offshore submerged foundation structures
US5722797A (en) * 1996-02-21 1998-03-03 Deep Oil Technology, Inc. Floating caisson for offshore production and drilling
CN109631845A (zh) * 2018-11-16 2019-04-16 浙江海洋大学 海洋平台倾斜观察设备
CN109631845B (zh) * 2018-11-16 2023-12-19 浙江海洋大学 海洋平台倾斜观察设备

Also Published As

Publication number Publication date
FR1583505A (fr) 1969-11-07
ES365949A1 (es) 1971-03-16
DE1918538A1 (de) 1969-10-30
NL6905190A (fr) 1969-10-14
BE730936A (fr) 1969-10-02
LU58376A1 (fr) 1970-11-09
GB1250098A (fr) 1971-10-20

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