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WO1996006003A1 - Dispositif stabilisateur pour une plate-forme flottante - Google Patents

Dispositif stabilisateur pour une plate-forme flottante Download PDF

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Publication number
WO1996006003A1
WO1996006003A1 PCT/SE1994/000781 SE9400781W WO9606003A1 WO 1996006003 A1 WO1996006003 A1 WO 1996006003A1 SE 9400781 W SE9400781 W SE 9400781W WO 9606003 A1 WO9606003 A1 WO 9606003A1
Authority
WO
WIPO (PCT)
Prior art keywords
platform
counterweights
density
containers
supporting medium
Prior art date
Application number
PCT/SE1994/000781
Other languages
English (en)
Other versions
WO1996006003A9 (fr
Inventor
Mats Gustafsson
Original Assignee
Mats Gustafsson
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
Priority claimed from SE9301942A external-priority patent/SE503583C2/sv
Application filed by Mats Gustafsson filed Critical Mats Gustafsson
Priority to EP94929062A priority Critical patent/EP0783428B1/fr
Priority to PCT/SE1994/000781 priority patent/WO1996006003A1/fr
Priority to AU78253/94A priority patent/AU7825394A/en
Priority to DE69418626T priority patent/DE69418626D1/de
Publication of WO1996006003A1 publication Critical patent/WO1996006003A1/fr
Publication of WO1996006003A9 publication Critical patent/WO1996006003A9/fr

Links

Classifications

    • 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
    • B63B35/34—Pontoons

Definitions

  • the present invention relates to a floating platform stabiliz ⁇ ing arrangement, and more particularly, but not exclusively, to counterweight compensation which restricts movement of the platform from a state of equilibrium.
  • Floating platforms such as bathing and boat jetties or like structures, are normally supported by buoyant bodies which are mounted at the outer edges or extremeties of the jetties and which consist in low-density cellular plastic bodies or air- filled containers. Every load that is applied to a platform of this nature is counteracted by an increase in the buoyancy forces, this increase being proportional to the applied load and being generated as a result of an increase in the volume of that part of the buoyant body which is thereby submerged in the water.
  • Fig. 1 is a schematic illustration of a conventional floating jetty
  • Fig. 2 illustrates the inventive arrangement.
  • Fig. 1 illustrates schematically for comparison purposes a typical floating jetty or like structure carried by two buoyant cellular plastic blocks mounted at the outer edges of the jetty. Because of their small intrinsic weight, the buoyant blocks will float high in the water and are sensitive to surface movement of the water and have a low or practically non-existent moment of inertia. When the jetty is loaded asymmetrically, the load is distributed between the buoyant blocks in proportions conversely to the distance between the loading point and respective buoyant blocks. Consequently, a load applied to one outer edge of the jetty will be counter ⁇ acted almost totally by the buoyant block located at this edge, and the block will be pressed downwards through a distance which is proportional to the volume of liquid displaced by the applied load. The construction is unable to balance rapid shifts in the points at which the load is applied, and floating jetties of this kind must therefore be considered unsteady and unstable.
  • FIG. 2 illustrates schematically and from one end an exempli ⁇ fying embodiment of the inventive arrangement.
  • a buoyant body 2 is mounted centrally beneath a platform 1.
  • the buoyant body 2 extends preferably centrally along essentially the full length of the platform 1.
  • Counterweights or containers 3, 4 are mounted on the underside of the platform 1 at its outer edges.
  • the containers 3, 4 are weighted, preferably filled with water or some other ballast, to a weight which will impart thereto a weight/volume unit which is greater than that of air and preferably equal to or in the vicinity of that of.
  • the supporting medium in which the structure floats, and the buoyant body 2 is dimensioned to lift the load-free platform with the weighted containers to a position in which the volume of the containers 3, 4 is partially submerged in the support ⁇ ing medium, preferably to half said volume.
  • the containers or counterweights 3 and 4 are thus weightless when fully sub- merged, when ignoring the container walls, and when in a fully uplifted position have a weight of about 1 kg/dm 3 if the containers are completely filled with water.
  • the sectional configuration of the containers/counterweights 3, 4 is preferably such that a small change in the buoyancy state will result in a large change in the volume of that part of the body which lies submerged in the supporting medium or lifted therefrom, and may have a circular, elliptical, pointed triangular or rectangular configuration.
  • the cross-sectional shape of the centrally positioned buoyant body 2 may vary, although a rectangular cross-sectional shape is preferred.
  • the net decrease and the net increase in the weight of respective counterweights/containers 3, 4 will be equal to the weight of the displaced water volume and the restored water volume respectively. From the aspect of stability, it is also desirable that the counterweights will have a heavy weight in relation to the load applied to the platform, which increases the inertia as the position of the platform changes.
  • a density i.e. a weight per unit of volume, which is higher than the density of the supporting medium
  • a maximum net increase and a maximum net decrease of the weight cannot be obtained when the counterweights are lifted from and submerged in the supporting medium. It will be seen from this that the effect of the counterweights can be best utilized when the counterweights have a density which coincides with or lies in the vicinity of the density of the supporting medium.
  • the counterweights can be integrated with the platform 1, mounted on the outer edges thereof and having the form of bodies whose densities correspond to or lie in the vicinity of the density of the water.
  • the effect of the counterweights may be achieved by a division between weight and volume, such that the weight in the form of a high density body is integrated with the platform and concentrated on its outer edge, while the volume is obtained in the form of a low density buoyant body mounted on the outer edge of the platform.
  • the counterweights 3, 4 have the form of water-filled containers, it may be necessary to only partially fill the containers with water, so that the platform will have a desired floating depth. In this case, a lower moment of inertia is obtained, although the advantages afforded by the invention can still be utilized in part.
  • the platform 1 By constructing the platform 1 in the aforedescribed manner as a balanced surface provided with counterweights whose weight may be changed quickly with their position in the water, an asymmetrically applied load will be distributed in the surface/platform and act in the rotational centre of the surface, i.e. against the buoyant body 1. This means that the change in the position of the platform from a horizontal position in response to uneven loading of the platform will be significantly smaller than the change in the position of the conventional floating jetty with a corresponding unevenly distributed load.
  • the balancing counterweights or containers 3, 4 increase the moment of inertia of the platform, which further enhances stability of the platform when subjected to hastily- applied loads and as a result of wave movement.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Revetment (AREA)

Abstract

L'invention a pour objet un dispositif destiné à stabiliser des plates-formes flottantes, telles que des jetées pour la baignade ou l'amarrage, et elle est caractérisée par un dispositif flottant (2) disposé en position centrale en-dessous de la plate-forme (1) et dimensionné de façon à soulever la plate-forme suffisamment haut hors du milieu qui la porte, lorsque la plate-forme est horizontale et qu'aucune charge ne s'exerce sur elle. Des contrepoids ou des réservoirs lestés (3, 4), partiellement submergés dans le milieu porteur, sont montés sur les bords extérieurs de la plate-forme.
PCT/SE1994/000781 1993-06-04 1994-08-25 Dispositif stabilisateur pour une plate-forme flottante WO1996006003A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP94929062A EP0783428B1 (fr) 1994-08-25 1994-08-25 Dispositif stabilisateur pour une plate-forme flottante
PCT/SE1994/000781 WO1996006003A1 (fr) 1993-06-04 1994-08-25 Dispositif stabilisateur pour une plate-forme flottante
AU78253/94A AU7825394A (en) 1993-06-04 1994-08-25 A floating platform stabilizing arrangement
DE69418626T DE69418626D1 (de) 1994-08-25 1994-08-25 Einrichtung zur stabilisierung einer schwimmenden plattform

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9301942A SE503583C2 (sv) 1993-06-04 1993-06-04 Stabiliserande anordning vid flytande plattformar
PCT/SE1994/000781 WO1996006003A1 (fr) 1993-06-04 1994-08-25 Dispositif stabilisateur pour une plate-forme flottante

Publications (2)

Publication Number Publication Date
WO1996006003A1 true WO1996006003A1 (fr) 1996-02-29
WO1996006003A9 WO1996006003A9 (fr) 1998-07-30

Family

ID=26661758

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/000781 WO1996006003A1 (fr) 1993-06-04 1994-08-25 Dispositif stabilisateur pour une plate-forme flottante

Country Status (1)

Country Link
WO (1) WO1996006003A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1616784A1 (fr) * 2004-07-15 2006-01-18 Hein Douwinus Voskamp Construction flottante
NL1029533C2 (nl) * 2004-07-15 2006-01-18 Hein Douwinus Voskamp Drijfbare constructie.
US7772569B2 (en) 2008-04-01 2010-08-10 The Jackson Laboratory 3D biplane microscopy
US8217992B2 (en) 2007-01-11 2012-07-10 The Jackson Laboratory Microscopic imaging techniques

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US647630A (en) * 1899-12-19 1900-04-17 Max Peschmann Life-preserving float.
SE369500B (fr) * 1971-10-21 1974-09-02 L Akersten

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US647630A (en) * 1899-12-19 1900-04-17 Max Peschmann Life-preserving float.
SE369500B (fr) * 1971-10-21 1974-09-02 L Akersten

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1616784A1 (fr) * 2004-07-15 2006-01-18 Hein Douwinus Voskamp Construction flottante
NL1029533C2 (nl) * 2004-07-15 2006-01-18 Hein Douwinus Voskamp Drijfbare constructie.
US8217992B2 (en) 2007-01-11 2012-07-10 The Jackson Laboratory Microscopic imaging techniques
US7772569B2 (en) 2008-04-01 2010-08-10 The Jackson Laboratory 3D biplane microscopy
US7880149B2 (en) 2008-04-01 2011-02-01 The Jackson Laboratory 3D biplane microscopy

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