EP0206932A1 - Dispositif de manutention de charges immergées - Google Patents

Dispositif de manutention de charges immergées Download PDF

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Publication number
EP0206932A1
EP0206932A1 EP86401330A EP86401330A EP0206932A1 EP 0206932 A1 EP0206932 A1 EP 0206932A1 EP 86401330 A EP86401330 A EP 86401330A EP 86401330 A EP86401330 A EP 86401330A EP 0206932 A1 EP0206932 A1 EP 0206932A1
Authority
EP
European Patent Office
Prior art keywords
submerged
handling
base
positioning cables
cables
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.)
Ceased
Application number
EP86401330A
Other languages
German (de)
English (en)
French (fr)
Inventor
Francois Parthiot
Pierre Valdy
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.)
Institut Francais de Recherche pour lExploitation de la Mer (IFREMER)
Original Assignee
Institut Francais de Recherche pour lExploitation de la Mer (IFREMER)
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 Institut Francais de Recherche pour lExploitation de la Mer (IFREMER) filed Critical Institut Francais de Recherche pour lExploitation de la Mer (IFREMER)
Publication of EP0206932A1 publication Critical patent/EP0206932A1/fr
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
    • B63C7/06—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects in which lifting action is generated in or adjacent to vessels or objects
    • B63C7/08—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects in which lifting action is generated in or adjacent to vessels or objects using rigid floats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
    • B63C7/006—Emptying the contents of sunken, stranded, or disabled vessels, e.g. by engaging the vessel; Underwater collecting of buoyant contents, such as liquid, particulate or gaseous contents, escaping from sunken vessels, e.g. using funnels, or tents for recovery of escaping hydrocarbons

Definitions

  • the present invention relates to a device for handling submerged loads.
  • underwater vehicles For handling light loads, underwater vehicles are commonly used which are independent, or almost independent, of any surface support or anchoring at the bottom and thus allow relatively precise handling.
  • the lifting power and the range of independent underwater vehicles is limited and their application is very limited.
  • An object of the present invention is to provide a device for handling submerged loads which is capable of handling heavy loads at significant depths and which can be quickly detached from a surface installation during deterioration of weather conditions.
  • a device for handling submerged loads comprising lifting means carried by an immersed structure connected to at least three positioning cables having one end fixed to anchoring points , and means for adjusting the length of the cables, characterized in that the submerged structure includes flotation means and in that the cables positioning extend between the submerged structure and the anchor points.
  • the positioning cables are tensioned by the flotation means and are entirely independent of the phenomena occurring on the surface.
  • this supply is reduced to the presence of an untensioned cable between the surface vessel and the submerged structure.
  • the handling device remains submerged and the power cable is disconnected from the submerged structure quickly and without danger.
  • the device comprises three anchoring points.
  • the submerged structure and the lifting means associated with it can move to any point with a minimum of operations for adjusting the length of the cables.
  • the immersed structure is a tetrahedral structure having a substantially triangular base and a point directed downward relative to the base.
  • the submerged structure has a small footprint and significant resistance to the forces to which it is subjected.
  • the means for adjusting the positioning cables are winches fixed to the base of the tetrahedral structure and the positioning cables pass over return pulleys disposed near the tip of the tetrahedral structure.
  • the points of application of the forces that the positioning cables exert on the structure are contained in a small area and the stability of the submerged structure is improved.
  • the device comprises a variable floating float connected to the submerged structure.
  • the flotation of the device is adapted at will by varying the degree of flotation of the float.
  • the device according to the invention comprises lifting means formed by a winch 1 carried by an immersed structure generally designated at 2.
  • the submerged structure 2 is connected to three positioning cables 3, 4, 5 each having a end fixed to anchor points, respectively 6, 7, 8.
  • the anchor points are, for example, concrete blocks made at the bottom of the sea at points regularly distributed around the loads to be handled (fig. 4) , each concrete block preferably being equipped with a ring on which one can fix each of the positioning cables 3, 4, 5.
  • the submerged structure comprises means for adjusting the length of the positioning cables 3, 4, 5.
  • These adjustment means comprise winches, respectively 9, 10, 11 carried by the submerged structure 2, so that the positioning cables 3 , 4, 5 extend between the submerged structure 2 and the anchor points 6, 7, 8.
  • the submerged structure comprises flotation means preferably produced on the one hand by leaktight tubular elements 12, 13, 14, 15 forming the structure itself and by a variable-float float 16, connected to the submerged structure 2.
  • the submerged structure 2 is preferably a tetrahedral structure having a substantially triangular base 12 and a point 17, formed by the point of convergence of the sealed tubular elements 13, 14, 15, directed downward relative to the base 12.
  • the tips of the triangular base 12 are truncated, two sides of the triangle being joined by a short element parallel to the opposite side and to which the upper end of one of the sealed tubular elements 13, 14, 15 is connected .
  • the positioning cable adjustment winches 3, 4, 5 are preferably fixed in the middle of each side of the base of the submerged structure 2 and the positioning cables 3, 4, 5 pass over idler pulleys, respectively 18, 19, 20, arranged near the point 17 of the tetrahedral structure.
  • Each return pulley is perpendicular to the median plane of the corresponding winch and is opposite the respective lateral tubular element 13, 14, 15, for example, the pulley 18 is in the diametrical plane of the winch 9 and is opposite to the 'lateral element 13, so that the forces on the positioning cable are transmitted to the submerged structure 2 under the most favorable conditions.
  • the variable buoyancy float 16 is connected by beams 21 to the base 12 of the submerged structure 2.
  • the lifting winch 1 on which a lifting cable 22 is wound is fixed on a plate 23 which is itself connected, for example by welds, at the base 12 of the submerged structure 2.
  • the plate 23 At its center, the plate 23 has an opening 24 whose axis passes through the center of thrust of the submerged structure 2.
  • the corners of the triangular base 12 are preferably equipped with grids 25 which thus let the water pass.
  • the submerged structure comprises a hydraulic unit 26 of a structure known per se comprising a pump arranged in a hydraulic fluid reservoir and a series of control valves connected to each winches 1, 9, 10, 11 by hydraulic conduits, respectively 27, 28, 29 and 30.
  • the hydraulic unit 26 is supplied with energy and receives control signals via a cable 31 connected to a buoy surface 32, itself connected by a cable 33 to a surface installation carried by a ship 34.
  • the site can be quickly abandoned by disconnecting the connection between the cable 33 and the buoy 32, the latter remaining in place to allow the location of the submerged structure when the site is resumed.
  • the length of the cable 31 is sufficient for it to remain relaxed whatever the position of the submerged structure 2.
  • variable buoyancy float 16 In order to adjust the buoyancy coefficient of the variable buoyancy float 16, it is connected to a compressed air duct 35 the upper end of which is connected to the buoy 32 and is connected to the surface vessel 34 by a compressed air duct 36.
  • the float 16 comprises valves (not shown) making it possible alternately to admit water to the float or, on the contrary, to introduce compressed air expelling the water contained in the float 16 in the manner of a ballast.
  • the site is first prepared. by forming the anchor blocks 6, 7, 8 regularly distributed for example around a wreck 37 on which the loads to be handled 38 are arranged.
  • the submerged structure 2 is then brought above the wreck 37, the elements watertight 12, 13, 14, 15 are preferably dimensioned so that their buoyancy coefficient balances the weight of the structure with its equipment.
  • the diving or lifting movements of the submerged structure can then be adjusted by varying the ballast of the float 16.
  • the positioning cables 3, 4 and 5 are hooked to the anchoring point 6, 7 and 8 and are partially wound in order to bring the submerged structure 2 to the desired rest position.
  • the buoyancy coefficient of the submerged structure 2 is then preferably adjusted by acting on the buoyancy coefficient of the float 16 so that the resulting buoyancy force of the assembly is slightly greater than the apparent weight of the load to be handled.
  • the submerged structure 2 will remain stationary when the load is lifted without, however, exerting too great a pulling force on the positioning cables 3, 4, 5.
  • the submerged structure 2 is moved to the new desired point by acting on the length of the positioning cables 3, 4, 5.
  • This movement can be provided visually by a closed television circuit or preferably by a computer receiving the desired coordinates for the tip 17 of the submerged structure.
  • the position of the tip 17 can be identified in space either by the distances D3, D4, D5 between the anchoring points 6, 7, 8 and the tip 17 , or by the angles A3, A4, A5, formed by the straight lines D3, D4, D5 with the reference plane containing the anchoring points 6, 7, 8.
  • the cables 3 , 4, 5 due to the arrow formed by the cables 3 , 4, 5, their length, respectively L3, L4, L5 is greater than the corresponding distances S3, D4, D5 and their angle with the plane containing the anchor points 6, 7, 8 is less than the respective angles A3, A4, AT 5.
  • the correction coefficient to be applied to the theoretical measurements is given by the chain calculations traditionally used for the calculation of the length of the anchor cables. In the case of an order by a computer, these corrections are therefore of course stored in the computer. Similarly, in order not to put any of the positioning cables in overvoltage, the consistency of the windings and unwinds of these positioning cables is ensured by a computer. In any case, the winches can be fitted with a safety device triggering an alarm during an overvoltage on one of the cables.
  • the submerged structure can be produced in different forms, for example by means of solid beams, the buoyancy of the structure then being entirely controlled by the float coefficient of the float 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Ship Loading And Unloading (AREA)
EP86401330A 1985-06-21 1986-06-18 Dispositif de manutention de charges immergées Ceased EP0206932A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8509439 1985-06-21
FR8509439A FR2583733B1 (fr) 1985-06-21 1985-06-21 Dispositif de manutention de charges immergees.

Publications (1)

Publication Number Publication Date
EP0206932A1 true EP0206932A1 (fr) 1986-12-30

Family

ID=9320499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401330A Ceased EP0206932A1 (fr) 1985-06-21 1986-06-18 Dispositif de manutention de charges immergées

Country Status (4)

Country Link
EP (1) EP0206932A1 (no)
DE (1) DE206932T1 (no)
FR (1) FR2583733B1 (no)
NO (1) NO862272L (no)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005073070A3 (en) * 2004-01-28 2005-09-29 Itrec Bv Method for lowering an object to an underwater installation site using an rov
US7032530B1 (en) * 2003-09-29 2006-04-25 The United States Of America As Represented By The Secretary Of The Navy Submarine air bag launch assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR624327A (fr) * 1926-09-15 1927-07-13 Procédé et dispositif pour renflouer les navires sombrés et ramener à la surfacetous autres objets tombés au fond de la mer
US3014984A (en) * 1958-11-10 1961-12-26 Irenus C Jacobson Underwater television device
US3123036A (en) * 1964-03-03 Ship salvage equipment
US3286672A (en) * 1964-06-01 1966-11-22 Lehmann Guenther Wolfgang Deep sea salvage equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123036A (en) * 1964-03-03 Ship salvage equipment
FR624327A (fr) * 1926-09-15 1927-07-13 Procédé et dispositif pour renflouer les navires sombrés et ramener à la surfacetous autres objets tombés au fond de la mer
US3014984A (en) * 1958-11-10 1961-12-26 Irenus C Jacobson Underwater television device
US3286672A (en) * 1964-06-01 1966-11-22 Lehmann Guenther Wolfgang Deep sea salvage equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7032530B1 (en) * 2003-09-29 2006-04-25 The United States Of America As Represented By The Secretary Of The Navy Submarine air bag launch assembly
WO2005073070A3 (en) * 2004-01-28 2005-09-29 Itrec Bv Method for lowering an object to an underwater installation site using an rov
EP2420439A1 (en) * 2004-01-28 2012-02-22 Itrec B.V. Method for lowering an object to an underwater installation site using an rov

Also Published As

Publication number Publication date
FR2583733B1 (fr) 1988-06-03
DE206932T1 (de) 1987-05-21
FR2583733A1 (fr) 1986-12-26
NO862272D0 (no) 1986-06-06
NO862272L (no) 1986-12-22

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Inventor name: VALDY, PIERRE

Inventor name: PARTHIOT, FRANCOIS