| 摘要 |
PURPOSE: An incline lower end apron structure of a riverbed structure is provided to keep a riprap structure firmly by preventing the scour or loss of ripraps caused by waves, flowing water, etc. CONSTITUTION: The incline lower end apron structure of a riverbed structure comprises the steps of piling unit hollow blocks(12,12a) on the seabed or the riverbed, then filling up the inner space of the hollow blocks(12,12a) with ripraps(13), forming a retreated plane(15) on the right and left sidewalls of the hollow block(12), then filling up the retreated plane(15) with ripraps(13), interposing a concrete lower projection(16) which intercepts the lower end of covered stone(5) placed on an incline(2) of a riprap structure along the riprap structure to a riprap plane(13a), and interposing covered stone(5a) between the front of the projection(16) and a front wall(12b) of the hollow block(12) to fix the projection(16).
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