opening deadline construction method of impervious type seawall

摘要

PROBLEM TO BE SOLVED: To eliminate the influence of an uplift pressure due to a tide level difference of a construction water area as much as possible when closing an opening of an impervious type revetment by an inclined dike comprising natural stones or the like.;SOLUTION: On a top end face of a foundation mound 26, a first top end height H1, with which securing the water conduction cross section Ws between outside and inside of a dike at lower position than a water level at the high tide is possible, is set taking the tide level difference of the construction water area into consideration, and a first impervious structure 24 extending from the first top end height H1 to an intra-dike bottom surface part is created. While making it possible to exchange water between outside and inside of the dike through the water conduction cross section Ws, the influence of the uplift pressure passing through the foundation mound 26 from the outside of the dike and acting on the back surface of the first impervious structure 24 is suppressed as much as possible. In the following process of creating a second impervious structure extending from a second top end height H2 at a position higher than the water level at the high tide in the construction water area to the intra-dike bottom surface part, the influence of the uplift pressure from the outside of the dike is eliminated by the first impervious structure 24.;COPYRIGHT: (C)2012,JPO&INPIT