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Method and device for assembling or disassembling a structure under water

Inactive Publication Date: 2014-05-29
HEEREMA MARINE CONTRACTORS NEDERLAND SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a device that can be used to disassemble the bottom part of a jacket or large object that rests on the seabed. It has a movable arm with a substantial lifting capacity, allowing it to handle large tools and jacket segments without the need for an extra under-water balloon. The device also includes a buoyancy device that connects to the arm to increase its lifting capacity.

Problems solved by technology

The cutting of the jacket generally is a time consuming and expensive operation.
For the lifting operation, heavy lift capability is required, which is expensive.
The known removal operation has a further disadvantage in that bad weather can cause significant delays, which further increase the costs.

Method used

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  • Method and device for assembling or disassembling a structure under water
  • Method and device for assembling or disassembling a structure under water
  • Method and device for assembling or disassembling a structure under water

Examples

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Embodiment Construction

[0208]Turning to FIG. 1A, a device 18 comprising an articulated movable arm 20 according to the invention is shown. The movable arm 20 comprises a support 22 having two clamps 24A, 24B. The two clamps 24A, 24B are connected to the support 22 and to one another via two intermediate beams 26A, 26B, which are preferably adjustable in length.

[0209]The clamps are constructed to transfer substantial forces in three dimensions and substantial moments about the X-axis, Y-axis and Z-axis from the device 18 to the structure 10. In particular when a lifting operation is performed, a downward vertical force is exerted by the device 18 via the support 22 onto the structure 10. If a current exists in the water, horizontal forces will also be transferred via the support 22 to the structure 10.

[0210]In an embodiment, the device does not comprise a support 22 configured to rest on the seabed 100. In this embodiment, all forces and moments are transferred to the structure 10.

[0211]In an embodiment, t...

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Abstract

A method of performing an under water operation on a structure (10) or in the vicinity of the structure includes providing a device (18) having a movable arm (20) and at least a first support (22) constructed to be connected to the structure, the movable arm (20) directly or indirectly connected at a proximal end (34) to the support, the first movable arm having a first tool (30) connected to a distal end (36) of the first movable arm, at least one actuator (33) configured to controllably move the first tool (30) in a three dimensional working range in order to position the first tool at a target location, attaching the device to the structure via the at least one support, and-moving the tool in three dimensions and performing an operation under water.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is the National Stage of International Application No. PCT / NL2012 / 050066, filed Feb. 7, 2012, which claims the benefit of Netherlands Application No. NL2006153, filed Feb. 7, 2011, having title “Method and device for assembling or disassembling a structure under water” and of U.S. Provisional Application No. 61 / 440,127, filed Feb. 7, 2011, having a same title, which contents of which applications are incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates a method and a device for assembling or disassembling a structure which is at least in part submerged, in particular for disassembling a jacket structure.BACKGROUND OF THE INVENTION AND PRIOR ART[0003]In the offshore industry, jacket structures (or jackets in short) are widely used to support and fix platforms above the sea surface. A jacket structure is generally positioned directly onto the seabed. A jacket comprises many tubulars whi...

Claims

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Application Information

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IPC IPC(8): E02B17/02E02B17/04
CPCE02B2017/0052E02B17/00B23D57/0084B63C11/52B25J11/0055E02B17/04E02B17/02E02B2017/006E02D9/04B23D57/00
Inventor AMMERLAAN, GUIDO, JOHANNES, MARIA
Owner HEEREMA MARINE CONTRACTORS NEDERLAND SE
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