Anchor

Details Anchor Anchor

2000-06-29

2001-07-10

Sotelo, Jesus D. (Department: 3617)

Ships

Anchor

With means driving the anchor into the sea bed

C114S299000

Reexamination Certificate

active

06257166

ABSTRACT:

The invention involves a method as described in the introduction to patent claim
1
, and an anchor as described in the introduction to claim
2
, where an anchor element may be released freely to the seabed and penetrate into the sediments in order to serve as anchoring for a platform or a surface vessel, for example.
BACKGROUND
In the Norwegian patent document no. 142,389, an anchor is described that may be driven into the seabed by a ram or weight, which is fastened to the anchor. The ram is operated by a hoisting wire which runs up to a surface vessel, and allows the anchor to be driven into the seabed until the ram does not allow further penetration. This is not satisfactory for cases where a safe anchoring of a large structure or floating system in loose seabed sediments is require&
In U.S. Pat. document No. 3,850,128, is described a method to drive an anchor into the seabed through use of vibrations. Here a cylinder shaped rod has four flukes forming a cross that guides penetration. This anchor is dependent on external manipulation to be able to penetrate the seabed and can therefore not be dropped.
OBJECTIVE
The main objective with the invention is to derive an anchor that through free fall may penetrate deep into the seabed such that the whole anchor is engulfed in relatively strong sediments. It is important that the anchor during the drop phase in water be held accurately in a vertical position and not rotate, but hold a linear motion during descent. Furthermore it is a subobjective to create a connection for the anchor line that transfers tension forces to the anchor such that a favorable load distribution develops.
INVENTION
With such an anchor it is possible to obtain penetration depths of 20-30 meters in soft seabed sediments with an anchor weight of 60-70 tons. The main effect lies in the stable anchor motion during the drop phase without rotation, and the low center of gravity in relation to the fluid forces which ensures that the anchor body does not tilt in the water phase or when it realizes penetration resistance from the sediments, but continues in a straight line fashion during the whole descent.


REFERENCES:
patent: 2993461 (1961-07-01), Feiler
patent: 3036542 (1962-05-01), Robinson
patent: 3154042 (1964-10-01), Thomason et al.
patent: 3520268 (1970-07-01), Bower
patent: 6106199 (2000-08-01), Medeiros, Jr. et al.

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