海岸堤防の老朽化に伴いパラペットに発生するひび割れ特性に関する現地調査

抄録

The technical management of old and age-advancing concrete armored coastal dikes to function longer is currently required. The purpose of this investigation is to discuss the number, location and width of cracks occurred on the parapet of old concrete armored coastal dikes along Mikawa Bay, by means of field measurement. The field measurement shows clearly that the crack width increases with advancing age of the coastal dike and that number of cracks increases as the design wave height becomes higher. The crack is found out to increase remarkably on the parapet length of9.5m-10.5m. The crack width of the banking-type coastal dike constructed more than 40years ago is revealed to be 1mm-73mm, which is much larger than 1mm-15mm of the retaining wall-type coastal dike constructed 23-28years ago. In addition, with increasing number of cracks, crack-occurrence locations are found out to be spread from central part to overall the parapet crown.