Marine lifting apparatus

Abstract

A catamaran lifting apparatus is disclosed for lifting objects in a marine environment. The apparatus includes first and second vessels that are spaced apart during use. A first frame spans between the vessels. A second frame spans between the vessels. The frames are spaced apart and connected to the vessels in a configuration that spaces the vessels apart. The first frame connects to the first vessel with a universal joint and to the second vessel with a hinged connection. The second frame connects to the second vessel with a universal joint and to the first vessel with a hinged or pinned connection. The catamaran hull arrangement provides longitudinal flexibility in a quartering sea state due to the unique universal joint and hinge placement between the frames or trusses and the hulls or barges. Each of the frames extends upwardly in an inverted u-shape, providing a space under the frame and in between the barges that enables a marine vessel to be positioned in between the barges and under the frames. In this fashion, an object that has been salvaged from the seabed can be placed upon the marine vessel that is positioned in between the barges and under the frames. Alternatively, a package that is to be lifted from the deck of a marine vessel, workboat, supply boat or the like can be lifted from the deck of the workboat, vessel, barge, etc. if it is to be then placed in the marine environment such as upon an existing jacket or other under support.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable

REFERENCE TO A “MICROFICHE APPENDIX”

Not applicable

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to marine lifting devices. More particularly, the present invention relates to an improved catamaran type lifting apparatus that employs spaced apart or catamaran hulls, each of the hulls supporting a truss or frame that spans between the hulls at spaced apart positions. Even more particularly, the present invention relates to an improved catamaran lifting apparatus for use in a marine environment, wherein apart frames are connected to the hulls in a configuration that spaces the vessels apart, the first frame connecting with a first of the hulls with the universal joint and to the second hull with a hinged connection, the second frame connecting to the second hull with a universal joint and to the first hull with a hinged connection.

2. General Background of the Invention

A catamaran lifting apparatus that can be used to lift multi-ton objects employs two spaced apart barges or hulls or vessels. In general, such lifting devices that employ a pair of spaced apart hulls have been patented, many patents having been issued to applicant as contained in the following table.

TABLE 1
PAT. NO.	TITLE	ISSUE DATE
4,714,382	Method and Apparatus for the Offshore	Dec. 22, 1987
	Installation of Multi-Ton Prefabricated
	Deck Packages on Partially Submerged
	Offshore Jacket Foundations
5,607,260	Method and Apparatus for the Offshore	Mar. 1, 1997
	Installation of Multi-Ton Prefabricated
	Deck Packages on Partially Submerged
	Offshore Jacket Foundations
5,609,441	Method and Apparatus for the Offshore	Mar. 11, 1997
	Installation of Multi-Ton Prefabricated
	Deck Packages on Partially Submerged
	Offshore Jacket Foundations
5,662,434	Method and Apparatus for the Offshore	Sep. 2, 1997
	Installation of Multi-Ton Prefabricated
	Deck Packages on Partially Submerged
	Offshore Jacket Foundations
5,800,093	Method and Apparatus for the Offshore	Sep. 1, 1998
	Installation of Multi-Ton Packages Such
	as Deck Packages, Jackets, and Sunken
	Vessels
5,975,807	Method and Apparatus for the Offshore	Nov. 2, 1999
	Installation of Multi-Ton Packages Such
	as Deck Packages and Jackets
6,039,506	Method and Apparatus for the Offshore	Mar. 21, 2000
	Installation of Multi-Ton Packages Such
	as Deck Packages and Jackets
6,149,350	Method and Apparatus for the Offshore	Nov. 21, 2000
	Installation of Multi-Ton Packages Such
	as Deck Packages and Jackets
6,318,931	Method and Apparatus for the Offshore	Nov. 20, 2001
	Installation of Multi-Ton Packages Such
	as Deck Packages and Jackets
6,364,574	Method and Apparatus for the Offshore	Apr. 2, 2002
	Installation of Multi-Ton Packages Such
	as Deck Packages and Jackets

BRIEF SUMMARY OF THE INVENTION

The present invention provides an improved catamaran lifting apparatus that employs first and second spaced apart vessels or hulls. The vessels can be barges, dynamically positioned marine vessels, other floating hulls or the like.

A first frame or truss spans between the hulls at a first position. A second frame or truss spans between the hulls at a second position. The first and second positions are spaced apart so that each frame can move independently of the other, notwithstanding wave action acting upon the hulls.

The first of the frames or trusses connects to the first hull with a universal joint and to the second hull with a hinged connection. The second frame connects to the second hull with a universal joint and to the first hull with a hinged connection. The catamaran hull arrangement provides longitudinal flexibility in a quartering sea state due to the unique universal joint and hinge placement between the frames or trusses and the hulls or barges.

Each frame extends upwardly in a generally inverted u-shape that provides space under the frame and in between the hulls for enabling a marine vessel to be positioned in between the hulls and under the frames. The space in between the hulls and under the frames can also be used as clearance for elevating an object to be salvaged from the seabed to a position next to or above the water's surface.

In a plan view, each frame can be generally triangular in shape. The frames can each be of a truss configuration.

In a second embodiment, one or more slings can be provided that connect between a frame and a hull. The connection of each frame to a hull opposite the universal joint can be a pinned or a hinged connection.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:

FIG. 1 is a perspective view of the preferred embodiment of the apparatus of the present invention;

FIG. 2 is an elevation view of the preferred embodiment of the apparatus of the present invention;

FIG. 3 is an end, elevation view of the preferred embodiment of the apparatus of the present invention;

FIG. 4 is a top plan view of the preferred embodiment of the apparatus of the present invention, with each winch and lifting line removed for clarity;

FIG. 5 is a perspective view of the preferred embodiment of the apparatus of the present invention;

FIG. 6 is an elevation view of the preferred embodiment of the apparatus of the present invention wherein the hulls are dynamically positioned vessels;

FIG. 7 is a plan view of the preferred embodiment of the apparatus of the present invention wherein the hulls are dynamically positioned vessels; and

FIG. 8 is a perspective view of the preferred embodiment of the apparatus of the present invention wherein the hulls are dynamically positioned vessels.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows the preferred embodiment of the apparatus of the present invention designated generally by the numeral 10. Marine lifting apparatus 10 provides a pair of spaced apart vessels or hulls 11, 12. Hulls 11, 12 can be barges, dynamically positioned vessels (see FIGS. 6-8), or any other buoyant structure. A pair of frames 13, 14 are provided, each frame 13, 14 spanning between the vessels 11, 12. Each frame 13, 14 connects to one vessel 11 or 12 with a universal joint 15 and to the other hull 11 or 12 with a hinged or pinned connection 16.

The frame 13 connects to hull 11 with universal joint 15. The frame 13 connects to vessel 12 with pinned connection or hinge 16. Similarly, the second frame 14 connects to hull 12 with a universal joint 17 and to hull 11 with a hinge or pinned connection 18.

An interface such as a deck beam can be provided on the upper deck 30 of each hull 11, 12 for forming an interface between the frames 13, 14 and the vessels 11, 12. For example, vessel 11 is provided with deck beam 19 that forms an interface between each of the frames 13, 14 and the barge or vessel 11. Deck beam 20 provides an interface between each of the frames 13, 14 and the vessel or barge 12.

In FIGS. 1 and 3, a plan or top view of the apparatus 10 of the present invention is shown with each winch and lifting line removed for clarity. A lifting area 21 is that area that is in between the vessels 11, 12, the area 21 having a length defined by dimension arrow 23 and a width defined by dimension arrow 22 in FIG. 4. This area 21 is sized and shaped to receive a vessel having a cargo to be lifted if that cargo (e.g. deck package) is to be installed. Alternatively, the area 21 can be an area that receives an item to be salvaged from an ocean floor such as a sunken boat or the like. In either case, a clearance is provided above the water surface 24 so that a barge or vessel can be placed under frames 13, 14 to receive the item (e.g., boat 33) that is salvaged from seabed 34.

In FIG. 3, a clearance is indicated schematically by the dimension line 25. Similarly, a clearance 26 is provided above the maximum deck elevation 35 of the hulls 11, 12 as shown in FIG. 3.

Each of the frames 13, 14 can be in the form of a truss as shown. Each frame 13, 14 can thus provide a center truss section 27, a smaller side truss section 28 and another smaller side truss section 29. Pinned connections 31, 32 can be provided for attaching the smaller truss sections 28, 29 to the larger center truss section 27 as shown in FIG. 3. For the frame of FIGS. 2-5, slings (not shown) can optionally be provided for connecting the center section 27 to the lower end portion of each of the smaller truss sections 28, 29. Shackles can be used to attach any slings to eyelets or padeyes on the center section 27. Likewise, shackles can be used to attach the slings to eyelets or padeyes or other attachments on the smaller truss sections 28, 29.

One or more hooks 40 or other lifting fitting can be attached to a lifting line 41 and payed out from winch 42. Sheaves 43, 44, 45 as needed can be used to route the line 41 from winch 42 to hook 40. Line 41 can be a multiple line assembly to increase lift capacity. Hook 40 can be any lifting fitting such as any known crown block, for example.

FIGS. 6-8 illustrate that dynamically positioned vessels 46, 47 can be used to support frames 13, 14. Dynamically positioned vessels 46, 47 are commercially available and are known. Dynamic positioning systems for vessels are commercially available. An example is the Kongsberg Simrad SBP10 work station. Such vessels 46, 47 can maintain a position even without the use of anchors. Dynamic positioning is a computer controlled system to automatically maintain a vessels position and heading by using the vessels own propellers and/or thrusters. Position reference sensors, combined with wind sensors, motion sensors and gyro compasses provide information to the computer pertaining to the vessels position and the magnitude and direction of the environmental forces affecting its position. Typically, a computer program contains a mathematical model of the vessel that includes information pertaining to wind and current drag of the vessel and the location of the thrusters. This knowledge, combined with the sensor information allows the computer to calculate the required steering angle and/or thruster output for each thruster. This allows operations at sea while mooring or anchoring is not feasible due to deep water, congestion on the sea bottom (pipelines, templates) or other problems.

Dynamic positioning may either be absolute in that the position is locked to a fixed point over the bottom, or relative to a moving object like another ship or an underwater vehicle. One may also position the ship at a favorable angle towards the wind, waves and current, called weathervaning. Dynamic position is much used in the offshore oil industry. There are more than 1,000 dynamic positioning ships in existence.

In FIGS. 6-8, dynamically positioned vessels 46, 47 each have a deck, pilot house or cabin, bow and stern. The dynamically positioned vessel 46 provides deck 48, pilot house 49, bow 50 and stern 51. Dynamically positioned vessel 47 provides a deck 52, pilot house 53, bow 54, stern 55.

Load spreader platforms can be provided to define an interface between each of the frames 13, 14 and the dynamically positioned vessels 46, 47. Load spreader platform 56 is positioned under articulating connection 15 while load spreader platform 57 is positioned under hinge or pinned connection 16. Load spreader platform 58 is positioned under articulating connection 17, forming an interface between that connection 17 and the deck 48 of vessel 46. Similarly, load spreader platform 59 forms an interface between deck 52 of vessel 47 and hinged or pinned connection 18 as shown in FIGS. 5-8.

In the preferred embodiment, the frames 13, 14 are positioned in between the pilot house of each dynamically positioned vessel and the stern of each dynamically positioned vessel as shown in FIG. 7. In the preferred embodiment, the dynamically positioned vessels 46, 47 are positioned so that both vessels 46, 47 have the bow 50, 54 pointed in the same direction and the stern 51, 55 pointed in the same direction, as shown in FIGS. 7-8.

As with the preferred embodiment of FIGS. 1-5, each frame 13, 14 can be provided with a winch 42 and multiple sheaths 43-45 and lifting line 41 with hook 40 and any other suitable rigging that enables the frames 13, 14 to lift objects from the seabed or to support items in between the dynamically positioned vessels 46, 47 in load area 60 and under frames 13, 14.

The following is a list of parts and materials suitable for use in the present invention.

PARTS LIST
Part Number Description
10          marine lifting apparatus
11          vessel
12          vessel
13          frame
14          frame
15          universal joint
16          hinge
17          universal joint
18          hinge
19          deck beam/interface
20          deck beam/interface
21          area
22          dimension
23          dimension
24          water surface
25          clearance above water
26          clearance above hull deck
27          center truss section
28          smaller truss section
29          smaller truss section
30          hull deck
31          pinned connection
32          pinned connection
33          sunken boat
34          seabed
35          maximum deck elevation
40          lifting hook
41          lifting line
42          winch
43          sheave
44          sheave
45          sheave
46          dynamically positioned vessel
47          dynamically positioned vessel
48          deck
49          pilot house
50          bow
51          stern
52          deck
53          pilot house
54          bow
55          stern
56          load spreader platform
57          load spreader platform
58          load spreader platform
59          load spreader platform
60          load area

All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise.

The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.

Claims

1. A method of lifting a package in a marine environment, comprising the steps of: a) providing spaced apart first and second vessels having a space therebetween each vessel being a self-propelled vessel with a bow and a stern, the bows of each vessel being pointed generally in the same direction;b) spanning a first frame between the vessels;c) spanning a second frame between the vessels;d) spacing the frames apart and connecting the frames to the vessels in a configuration that maintains said spacing of the vessels apart;e) connecting the first frame to the first vessel with a universal joint and to the second vessel with a hinged connection;f) connecting the second frame to the second vessel with a universal joint, and to the first vessel with a hinged connection;g) wherein the universal joint and the hinged connection on the first vessel are spaced apart;h) wherein the universal joint and the hinged connection on the second vessel are spaced apart; andi) extending each frame upwardly in an inverted u-shape, providing a space under the frame and in between the barges, enabling a package to be lifted to be positioned in between the barges and under the frames.

2. The method of claim 1 wherein at least one vessel is dynamically positioned.

3. The method of claim 1 wherein each vessel is dynamically positioned.

4. The method of claim 1 wherein the first frame is a truss.

5. The method of claim 1 wherein the second frame is a truss.

6. The method of claim 1 further comprising the step of controlling the position of each vessel with an electronic positioning device.

7. The method of claim 1 further comprising the step of controlling the position of each vessel with a computer.

8. The method of claim 1 wherein in step “e” the hinged connection includes multiple pinned connections.

9. The method of claim 1 further comprising the step of extending the first frame much wider at one end portion than at its other end portion.

10. The method of claim 1 further comprising the step of extending the second frame much wider at one end portion than at its other end portion.

11. A catamaran vessel lifting apparatus comprising: a) first and second vessels, at least one of the vessels being a dynamically positioned vessel;b) a first frame that spans between the vessels;c) a second frame that spans between the vessels;d) the frames being spaced apart and being connected to the vessels in a configuration that spaces the vessels apart;e) the first frame connecting to the first vessel with a first universal joint and to the second vessel with a first hinged connection, wherein the first universal joint and first hinged connection are spaced apart;f) the second frame connecting to the second vessel with a second universal joint, and to the first vessel with a second hinged connection, wherein the second universal joint and the second hinged connection are spaced apart; andg) each frame extending upwardly in an inverted u-shape, providing a space under the frame and in between the vessels, said space enabling a marine vessel to be positioned in between the vessels and under the frames.

12. The catamaran vessel lifting apparatus of claim 11 wherein each hinged connection is not a universal joint.

13. The catamaran vessel lifting apparatus of claim 11 wherein each universal joint is an articulating joint that enables rotation about multiple axes.

14. The catamaran vessel lifting apparatus of claim 11 wherein the first frame is a truss.

15. The catamaran vessel lifting apparatus of claim 11 wherein the second frame is a truss.

16. The catamaran vessel lifting apparatus of claim 11 wherein the hinge includes multiple pinned connections.

17. The catamaran vessel lifting apparatus of claim 11 wherein the first frame is much wider at one end portion than at its other end portion.

18. The catamaran vessel lifting apparatus of claim 11 wherein the second frame is much wider at one end portion than at its other end portion.

19. The catamaran vessel lifting apparatus of claim 11 wherein both vessels are dynamically positioned vessels.

20. The catamaran vessel lifting apparatus of claim 11 wherein each vessel has a bow, a stern and wherein the bows of the vessels are pointed in the same direction.

21. A catamaran vessel lifting apparatus comprising: a) first and second vessels, at least one of the vessels being a dynamically positioned vessel;b) a first frame that spans between the vessels;c) a second frame that spans between the vessels;d) the frames being spaced apart and being connected to the vessels in a configuration that spaces the vessels apart;e) the first frame connecting to the first vessel with a universal joint and to the second vessel with a hinged connection;f) the second frame connecting to the second vessel with a universal joint, and to the first vessel with a hinged connection; andg) each frame extending upwardly in an inverted u-shape, providing a space under the frame and in between the vessels, said space enabling a marine vessel to be positioned in between the vessels and under the frames;h) wherein at least one of said vessels has a pilot house, a deck, a bow and a stern and wherein each of the frames attach to the vessel in between a pilot house and a stern.

22. The catamaran vessel lifting apparatus of claim 21 wherein each hinged connection is not a universal joint.

23. The catamaran vessel lifting apparatus of claim 21 wherein each universal joint is an articulating joint that enables rotation about multiple axes.

24. The catamaran vessel lifting apparatus of claim 21 wherein the first frame is a truss.

25. The catamaran vessel lifting apparatus of claim 21 wherein the second frame is a truss.

26. The catamaran vessel lifting apparatus of claim 21 wherein the hinge includes multiple pinned connections.

27. The catamaran vessel lifting apparatus of claim 21 wherein the first frame is much wider at one end portion than at its other end portion.

28. The catamaran vessel lifting apparatus of claim 21 wherein the second frame is much wider at one end portion than at its other end portion.

29. The catamaran vessel lifting apparatus of claim 21 wherein both vessels are dynamically positioned vessels.

30. The catamaran vessel lifting apparatus of claim 21 wherein each vessel has a bow, a stern and wherein the bows of the vessels are pointed in the same direction.