COAST STRUCTURE REDUCING ACCUMULATION AND EROSION DUE TO COAST DRIFT SAND

To provide means capable of preventing a generation of sediment in a harbor without being affected by water flow environment in a water area where a harbor is constructed.SOLUTION: A coast structure 1 comprises: dam body 11 and dam body 12 disposed to be separated form a shore line G to sea S side,...

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Bibliographic Details
Main Authors MAEDA YUJI, KONDO KENICHI
Format Patent
LanguageEnglish
Japanese
Published 31.05.2022
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Summary:To provide means capable of preventing a generation of sediment in a harbor without being affected by water flow environment in a water area where a harbor is constructed.SOLUTION: A coast structure 1 comprises: dam body 11 and dam body 12 disposed to be separated form a shore line G to sea S side, extending to an offshore direction, and forming a harbor; a steel sheet pile 13 installed on a sea bottom so as to connect a land side end portion of the dam body 11 and a land side end portion of the dam body 12; a plurality of piles installed on a sea bottom of an area between the steel sheet pile 13 and a shore L; and a floor slab 15 installed on the piles. The harbor formed by the dam body 11, the dam body 12, and the steel sheet pile 13 is disposed to be separated from the shore L, thus, coast drift sand is not largely inhibited. The floor slab 15 includes an opening portion O1 and an opening portion O2 that vertically penetrate. Via the openings, accumulated sand on the sea bottom below the floor slab 15 can be easily dredged onto the floor slab 15. So, a status where sediment generated outside the harbor proceeds and sand flows into the harbor through a harbor entrance can be easily avoided.SELECTED DRAWING: Figure 1 【課題】港が構築される水域の水流環境に左右されることなく、港内における堆砂の発生を防止できる手段を提供する。【解決手段】沿岸構造物1は汀線Gから海S側に離間配置され岸沖方向に延伸し港を形成する堤体11及び堤体12と、堤体11の陸側端部と堤体12の陸側端部との間をつなぐように海底に打設された鋼矢板13と、鋼矢板13と岸Lとの間の領域の海底に打設された複数の杭と、それらの杭の上に設置された床版15を備える。堤体11、堤体12、及び鋼矢板13により形成される港は、岸Lから離間配置されているため、沿岸標砂が大きく阻害されることがない。また、床版15は上下方向に貫通する開口部O1及び開口部O2を有し、これらの開口部を介して床版15上から床版15の下方の海底に堆積した砂を容易に浚渫できる。そのため、港の外側に生じる堆砂が進行して港口から砂が港内に流れ込む状況を容易に回避できる。【選択図】図1
Bibliography:Application Number: JP20200192734