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Safety and Reliability

Embedded Suction Anchors for Mooring of a Floating Breakwater

[+] Author and Article Information
D. J. Kwag

 AdvaCT, 1307-37 Kwanyang-dong, Dongan-gu, Anyang, 606–610 Koreadjkwag@paran.com

I. H. Cho

 AdvaCT, 1307-37 Kwanyang-dong, Dongan-gu, Anyang, 606–610 Koreaspace91@nate.com

S. Bang

Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph Street, Rapid City, SD 5770sangchul.bang@sdsmt.edu

Y. Cho

 Daewoo Engineering and Construction Co., Ltd., 57 Sinnumro-1-ga, Jongro-gu, Seoul, 100–713 Koreaykcho@dwconst.co.kr

J. Offshore Mech. Arct. Eng 132(2), 021603 (Mar 10, 2010) (5 pages) doi:10.1115/1.4000400 History: Received October 05, 2008; Revised July 24, 2009; Published March 10, 2010; Online March 10, 2010

A floating breakwater was built in Southern Korea. Four separate floating breakwater units were moored to ten deeply buried embedded suction anchors. The embedded suction anchor is a type of permanent offshore foundation installed by a suction pile. The cross section of the embedded suction anchor is circular, with its diameter being equal to that of the suction pile that is used to drive it into the seafloor. Vertical flanges are typically added along the circumference to increase its resistance. Determination of the loading capacity and the dimensions of embedded suction anchors are described. Details of the construction and installation of embedded suction anchors, as well as the field proof test results are also discussed. A total of ten steel embedded suction anchors were manufactured and installed successfully. Installation of embedded suction anchors was accomplished with a suction pile attached to its top. Subsequent proof tests validated the design loading capacity of embedded suction anchors. A floating breakwater consisted of four separate units was constructed. Initially, embedded deadweight concrete blocks were considered to moor the floating breakwater units. Later, however, embedded suction anchors replaced the concrete block anchors due to numerous environmental constraints. Each floating unit was anchored with four embedded suction anchors. Field proof tests indicate that the embedded suction anchors can provide necessary resistance against the anticipated wind and wave forces.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Floating breakwater

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Figure 2

Original breakwater design with dead-weight anchors

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Figure 3

Revised breakwater design with embedded suction anchors

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Figure 4

Suction pile with embedded suction anchor

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Figure 5

Photo of embedded suction anchor

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Figure 6

Typical seafloor soil profile

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Figure 7

Embedded suction anchor dimensions

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Figure 8

Floating breakwater unit

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