A series of field suction pile installation tests have been conducted inside the Onsan harbor located in southeastern Korea during the summer of 2001. The suction piles were made of steel, having inside diameters ranging from 0.5 meters to 2.5 meters and the length of five meters. The seafloor soil condition at the site is predominantly silty sand. Instrumentation includes the detailed measurement of the applied pressure vs. pile penetration and retrieval length relationships; the pile alignment during installation through a tiltmeter; and the pore water pressures both inside and outside the pile.

Small-scale field tests on a monopod suction pile with and without the detachable penetration apparatus (DPA) and tripod suction buckets have been performed. One of the objectives of the field tests was to identify the capability of the DPA at small-scale and to obtain useful information for planned future full-scale field tests. The DPA which has been developed to control and increase the accuracy of the verticality of monopod suction piles during installation. In addition, it can also contribute to increase the penetration force under certain conditions. Included in this paper are the details of the small-scale field tests, including the site conditions, suction pile details, DPA details, installation, instrumentation equipment, and test results. Results indicate that the tripod suction buckets have a significant advantage over the monopod suction pile for verticality control and that the newly developed DPA is fully capable of enhancing the verticality control of the monopod suction pile during installation.

A floating breakwater is currently being built in southern Korea. Four separate floating breakwater units will be moored to ten deeply embedded suction anchors. The embedded suction anchor is permanent offshore foundation installed by a suction pile. The cross-section of the embedded suction anchor is circular with its diameter being the same as that of the suction pile that is used to drive it into the seafloor. Vertical flanges are added along the circumference to increase its resistance. The design, construction, installation, and proof testing of embedded suction anchors are briefly described.

As part of the national off-shore wind power development project by the government of Korea, the very first off-shore wind turbine utilizing tri-pod suction buckets for its sub-surface foundation has been successfully completed. This off-shore wind turbine with a capacity of 3MW has been designed, constructed, and installed in late 2016. It is located approximately 200 meters offshore with a water depth of approximately 10 meters. Sub-surface soil consists of interbedded clay and sand layers. Details of the design, construction, and installation of this wind turbine with tripod suction bucket foundation system are described and discussed.

A St u d yo nDe s i g no fOf f s h o r eMe t e o r o l o g i c a lTo we r 문채주* ,장영학* * ,박태식* * * †,정문선* * * * , 주효준* * * * * ,권오순* * * * * * ,곽대진* * * * * * * ,정권성* * * * * * * *Mo o nC h a e -J o o * ,Y o u n g -H a kC h a n g * * ,T a e -S i kP a r k * * * †, Mo o n -S e o nJ e o n g * * * * ,H y o -J o o nJ o o * * * * * ,O-s o o nK w o n * * * * * * , D a e -J i nK w a g * * * * * * * ,Gw o n -S e o n gJ e o n g * * * * * * * * ( S u b mi td a t e:2 0 1 3 .1 .2 3 . ,J u d g me n td a t e:2 0 1 4 .2 .7 . ,P u b l i c a t i o nd e c i d ed a t e:2 0 1 4 .4 .2 2 . ) Abstract : A me t e o r o l o g i c a l ( me t )t o we ri st h ef i r s ts t r u c t u r ei n s t a l l e dd u r i n gt h ep l a n n i n gs t a g e so fo f f s h o r ewi n d f a r m. Th ep u r p o s eo ft h i sp a p e ri st od e s i g nt h eme tt o we rwi t ht r i p o db u c k e tt y p es u p p o r ts t r u c t u r ea n dt oi n s t a l l t h es e n s o r s .Th es u p p o r ts t r u c t u r ec o n s i s to fac e n t r a ls t e e ls h a f tc o n n e c t e dt ot h r e ec y l i n d r i c a ls t e e ls u c t i o n b u c k e t swh i c hi smo r ec h e a p e rt h a nmo n o p i l eo rj a c k e tt y p e . An dt h er e mo t ewi n dc o n d i t i o ns e n s o r sa n dma r i n e mo n i t o r i n ge q u i p me n t , i n c l u d i n ga d c p , p r e s s u r et y p et i d eg a u g e , wa v eh e i g h ts e n s o r s , a n ds c o u rs e n s o r s , r e mo t e p o we rs u p p l ya r ei n s t a l l e d . Th ema n u f a c t u r e dme tt o we rc o n s t r u c t e do ns e aa r e awh i c hi si nf r o n to fGa s ai s l a n d . Al l o ff u n c t i o n so fme tt o we rs h o we dn o r ma l o p e r a t i o nc o n d i t i o n sa n dt h ewi n dd a t ag o tb yr e mo t ed a t ac o l l e c t i o n s y s t e m s u c c e s s f u l l y .Key Words : 해상기상타워( Of f s h o r eMe t e o r o l o g i c a l To we r ) , 버킷형식 지지구조물( Bu c k e tTy p eS u p p o r tS t r u c t u r e ) , 해상풍력단지( Of f s h o r eWi n dF a r m) , 해양환경( Ma r i n eE n v i r o n me n t ) , 원격자료수집( R e mo t eDa t aC o l l e c t i o n )[논문] 한국태양에너지학회 논문집