Hydraulic and earth engineering – Marine structure or fabrication thereof – Cast in situ
Patent
1985-05-08
1987-02-17
Scanlan, Jr., Richard J.
Hydraulic and earth engineering
Marine structure or fabrication thereof
Cast in situ
405267, 405 11, E02D 300, E02D 312
Patent
active
046436170
ABSTRACT:
A seabed mound creating method suitable for a construction of a large scale offshore structure comprises the steps of setting up a plurality of sheet piles along the outer periphery of a mound creation region in a seabed area of soft ground to form an earth-retaining wall projecting from the seabed, and raising the ground level of the seabed within the earth-retaining wall by depositing soft soil into the earth-retaining wall to heap the deposited soil to a predetermined height. The method further comprises the step of implementing a ground improvement process to both the heaped-up soft soil and the soft ground of the seabed within the earth-retaining wall so that the ground improvement process is provided to a predetermined depth below the seabed, thus to form a seabed mound integral with the improved ground. The seabed mound may be provided at the upper portion with a projection area serving as a shear key with respect to a horizontal external force. Such a seabed mound can eliminate difficulty in supplying mound materials even when constructing a structure in an offshore area. When the ground improvement process is equally implemented to both a seabed ground and the heaped up soft soil, the seabed integrally formed with the improved ground can be created. Thus, a great shear strength due to such an integral structure can resist a horizontal external force, thereby ensuring high security.
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Hara Makoto
Hisaka Tsugio
Kanno Haruki
Kawarabayashi Hideaki
Kawarada Minoru
Hall Kristina I.
Scanlan, Jr. Richard J.
Takenaka Kohmuten Co., Lt.
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