# US 4,397,255 A · Anchor holding capacity augmentation system

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- Number: US 4,397,255 A
- Document ID: US4397255A
- Status: Granted
- Kind: A
- Application number: 06/273,825
- Filed: 1981-06-15
- Granted: 1983-08-09
- Earliest claimed: 1981-06-15
- Assignees: The United States of America as represented by the Secretary of the Navy
- Inventors: Robert J. Taylor
- Web page: https://patentgrep.com/patent/US4397255A

## CPC

- B63B 21/20: Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B 21/24: Anchors
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)

## Abstract

A series of spaced in-line plates attached to a through wire, rope or chain ooring line is placed between an anchor and the main mooring line to enhance overall mooring capability of an installed anchor of any of a variety of types including stake piles, propellant embedment anchors, vibratory anchors, and jetted in anchors. For the device to be functional the mooring lead should be approximately unidirectional and mooring scope should be such that upon loading, the anchor plate system is forced into the seafloor as the line catenary between the anchor deadman and the moored object straightens.

## Claims

### Claim 1

An anchor holding capacity augmentation system for enhancing the overall mooring capability of an embedded anchor in soft seafloors, comprising:
a. a mooring line connected between the anchor and an object to be moored;
b. a segment of said mooring line comprising a chain;
c. a plurality of spaced in-line plate means attached along said chain segment of said mooring line for a predetermined distance from a point on said mooring line segment above the seafloor toward the object to be moored when said mooring line is in a substantially vertical position above the anchor;
d. means for securely fastening each said plate means onto individual chain links of said segment of mooring line;
e. said plate means each having a determined planar area for providing a given amount of holding capacity under unidirectional mooring loads along said mooring line when embedded into the seafloor;
f. means associated with each said plate means for maintaining the plate means in a position such that the planar area thereof is maintained substantially normal to the line of action of said mooring line;
g. each said plate means penetrating and being embedded edgewise into the seafloor as said mooring line swings from said substantially vertical position to an inclined position with the seafloor as a mooring load is applied.

### Claim 2 (depends on 1)

A system as in claim 1 wherein said mooring line passes through each said plate means.

### Claim 3 (depends on 1)

A system as in claim 1 wherein each said plate means is symmetrical.

### Claim 4 (depends on 1)

A system as in claim 1 wherein said mooring line passes through each said plate means substantially at the center of the planar area thereof.

### Claim 5 (depends on 1)

A system as in claim 1 wherein the dimensions of each said plate means is determined from seafloor soil strength and mooring load.

### Claim 6 (depends on 1)

A system as in claim 1 wherein the spacing distance between each said plate means is a function of seafloor soil type.

### Claim 7 (depends on 1)

A system as in claim 1 wherein spacing between each said plate means is approximately twice the width of a plate means.

### Claim 8 (depends on 1)

A system as in claim 1 wherein each said plate means comprises a flat plate of high tensile strength material.

### Claim 9 (depends on 1)

A system as in claim 1 wherein each said plate means comprises high tensile strength material which tapers from the center thereof to a thin edge.

### Claim 10 (depends on 1)

A system as in claim 1 wherein said plate means are spaced apart a distance determined to ensure maximum holding capacity with a minimum number of plate means.

### Claim 11 (depends on 1)

A system as in claim 1 wherein each said plate means and respective said means for maintaining the plate means normal to said mooring line are each formed in one unitary body.