EP0173765A2 - Prefabricated unit for the construction of immobile floating platforms - Google Patents

Prefabricated unit for the construction of immobile floating platforms Download PDF

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Publication number
EP0173765A2
EP0173765A2 EP84113979A EP84113979A EP0173765A2 EP 0173765 A2 EP0173765 A2 EP 0173765A2 EP 84113979 A EP84113979 A EP 84113979A EP 84113979 A EP84113979 A EP 84113979A EP 0173765 A2 EP0173765 A2 EP 0173765A2
Authority
EP
European Patent Office
Prior art keywords
unit
buoy
pillars
construction
weight
Prior art date
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.)
Withdrawn
Application number
EP84113979A
Other languages
German (de)
French (fr)
Other versions
EP0173765A3 (en
Inventor
Pavlos Ioakim
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0173765A2 publication Critical patent/EP0173765A2/en
Publication of EP0173765A3 publication Critical patent/EP0173765A3/en
Withdrawn legal-status Critical Current

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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
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B75/00—Building or assembling floating offshore structures, e.g. semi-submersible platforms, SPAR platforms or wind turbine platforms
    • 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 invention relates to prefabricated unit for the construction of immobile floating platforms for use in sea and lake watersconsisting of a slab joined by means of pillars to the top of a buoy wherein rings are provided for the anchoring of the unit.
  • Construction with foundations on the bottom of a lake or on the seabed entails very high costs, especially in deep waters. Moreover, the progress of the construction is often hindered by local wheather conditions resulting in even higher costs and longer times of completion.
  • the invention overcomes these drawbacks. It solves the problem of how to construct speedily and at low cost an immobile floating platform by use of floating prefabricated units specifically designed to be unaffected by waves.
  • the advantages offered by the invention are mainly low cost and high speed of construction.
  • the volume of the buoy and the weight of the entire unit are such that the free-floating level (7) of the unit is situated between the top and the bottom of the buoy.
  • the unit will remain immobile regardless of the presence of waves or fluctuations of the load exerted on the unit.
  • the unit has fastening means (21,22,23,24) for the joining of units together in any desired fashion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Civil Engineering (AREA)
  • Revetment (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

A slab (6) is joined by means of pillars (2, 3, 4, 5) to the top of a buoy (1). The weight of the entire unit and the volume of the buoy (1) are such that the level of free-floating (7) of the unit is between the top and the bottom of the buoy (1). The height of the pillars (2, 3, 4, 5) is greater than the expected maximum height of waves in the region where the unit has been installed. The unit is anchored by means of ropes (12, 13, 14, 15) under tension so that it is kept submerged to a level (20) which is above the top of the buoy (1) and below the slab (6). At this position and for loads up to the difference of the buoyance of the buoy minus the weight of the entire unit and minus the weight of the ropes (12, 13, 14, 15) the unit remains immobile despite the existence of waves or fluctuations of the load it is bearing.

Description

  • The invention relates to prefabricated unit for the construction of immobile floating platforms for use in sea and lake watersconsisting of a slab joined by means of pillars to the top of a buoy wherein rings are provided for the anchoring of the unit.
  • To date, similar constructions for use in water have been founded on the seabed.Floating and yet immobile structures have not, to date, been described. The existing floating units can be used only for structures where vertical movement can be tolerated.
  • Construction with foundations on the bottom of a lake or on the seabed entails very high costs, especially in deep waters. Moreover, the progress of the construction is often hindered by local wheather conditions resulting in even higher costs and longer times of completion.
  • The invention,as claimed, overcomes these drawbacks. It solves the problem of how to construct speedily and at low cost an immobile floating platform by use of floating prefabricated units specifically designed to be unaffected by waves.
  • The advantages offered by the invention are mainly low cost and high speed of construction.
  • One way of carrying out the invention is described in detail below with reference to the attached drawing which illustrates only one specific embodiment, in which:
    • Figure 1 is an axonometric view of a unit in operation in accordance with the invention. The unit consists essentially of a slab (6) joined by means of pillars (2, 3,4,5) to the top of a buoy (1) wherein rings (8,9,10,11) are provided for the anchoring of the unit through ropes (12,13,14,15) to anchoring elements (16,17,18,19).
  • The volume of the buoy and the weight of the entire unit are such that the free-floating level (7) of the unit is situated between the top and the bottom of the buoy. The following requirements must be met for the proper functioning of the unit:
    • a. The unit must be kept submerged to a level (20) above the top of the buoy (1) and below the slab(6), preferably around midheight of the pillars (2,3,4,5), i.n order to achieve that the ropes (12,13,14,15) are under tension.
    • b.The height of the pillars must be greater than the maximum expected height of the waves in the region where the unit has been installed.
    • c. The horizontal cross section of the pillars must be substantially smaller than that of the buoy.
    • d. The buoyance of the buoy(l) minus the weight of the entire unit and minus the weight of the ropes(12,13,14, 15) must be greater than the maximum expected load to be borne by the unit.
  • If these requirements have been met the unit will remain immobile regardless of the presence of waves or fluctuations of the load exerted on the unit.
  • In accordance with a preferred embodiment of the invention, the unit has fastening means (21,22,23,24) for the joining of units together in any desired fashion.

Claims (2)

  1. l.Prefabricated unit for theconstruction of immobile floating platforms consisting of a slab(6) joined by means of pillars (2,3,4,5) to the top of a buoy(6), wherein rings (8,9,10,11) are provided for the anchoring of the unit, characterised in that the volume of the buoy and the weight of the entire unit are such that the line of free-floating (7) of the unit is between the top and the bottom of the buoy (1), that the height of the pillars (2,3,4,5) is greater than the expected maximum height 01 the waves in the region where the unit has been installed and that the horizontal cross section of the pillars (2,3,4,5) is substantially smaller than the horizontal cross section of the buoy(6).
  2. 2. A prefabricated unit as claimed in claim 1 characterised in that on the unit there are fastening means (21,22,23,24) for the joining in any desired fashion of units together.
EP84113979A 1984-09-07 1984-11-19 Prefabricated unit for the construction of immobile floating platforms Withdrawn EP0173765A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GR80311A GR80311B (en) 1984-09-07 1984-09-07 Prefabricated elements for the manufacture of unmoving jetty
GR8031184 1984-09-07

Publications (2)

Publication Number Publication Date
EP0173765A2 true EP0173765A2 (en) 1986-03-12
EP0173765A3 EP0173765A3 (en) 1987-08-05

Family

ID=10938061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113979A Withdrawn EP0173765A3 (en) 1984-09-07 1984-11-19 Prefabricated unit for the construction of immobile floating platforms

Country Status (3)

Country Link
EP (1) EP0173765A3 (en)
BR (1) BR8405667A (en)
GR (1) GR80311B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785313A (en) * 1972-08-14 1974-01-15 Us Navy Spherical module connectors
AU479313B2 (en) * 1973-10-18 1975-04-24 Deep Oil Technology, Incorporated Tension leg offshore marine apparatus
FR2278563A1 (en) * 1975-06-24 1976-02-13 Mo Olav Concrete floating construction with operating platform - with heavy submerged structure and light superstructure
DE2602747B2 (en) * 1976-01-26 1978-02-23 Preussag Ag, 3000 Hannover Und 1000 Berlin FLOATING PRODUCTION PLATFORM

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785313A (en) * 1972-08-14 1974-01-15 Us Navy Spherical module connectors
AU479313B2 (en) * 1973-10-18 1975-04-24 Deep Oil Technology, Incorporated Tension leg offshore marine apparatus
FR2278563A1 (en) * 1975-06-24 1976-02-13 Mo Olav Concrete floating construction with operating platform - with heavy submerged structure and light superstructure
DE2602747B2 (en) * 1976-01-26 1978-02-23 Preussag Ag, 3000 Hannover Und 1000 Berlin FLOATING PRODUCTION PLATFORM

Also Published As

Publication number Publication date
GR80311B (en) 1984-12-17
BR8405667A (en) 1986-06-03
EP0173765A3 (en) 1987-08-05

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