| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a box type steel sheet pile, without leaking out a toxic substance, by surely cutting off water with a simple structure.SOLUTION: A flange part 20 is formed by extending opposed both side parts of a hollow box-shaped steel material 10, and a joint 30 is provided on a tip of the flange part 20, and a continuous wall 110 is constructed by connecting the mutual adjacent joints 30. A water cutoff plate 40 projecting toward an outside of a hollow part, is provided on an outer surface of the hollow part of the box-shaped steel material 10 and on the side for connecting the adjacent other box-shaped steel material 10, and a box-shaped steel sheet pile 100 is formed. An underground storage tank 120 is constructed by filling water cutoff materials 50a and 50b in a clearance of the connected joint 30 and a space part formed between the adjacent box-shaped steel materials 10.</p> |
