| 摘要 |
PROBLEM TO BE SOLVED: To provide a filling member for an underground water tank by which filling members adjacent to each other in the oblique direction can be connected only when filling members are arranged in the horizontal direction (longitudinal direction) and in the vertical direction without using a connector.SOLUTION: A filler for an underground water tank comprises at least a square horizontal board part 1, and the horizontal board part 1 is integrally formed with a connection protrusion 3a and a connection recess 3b which are connected with the horizontal board part of the filling member to be placed on or under the horizontal board part of the filling member adjacent in the horizontal direction, in other words, the horizontal board part of the filling member adjacent in the oblique direction. When filling members are arranged in the horizontal direction (longitudinal direction) and in the vertical direction, the connection protrusion 3a and the connection recess 3b are engaged with each other so as to connect filling members adjacent to each other in the oblique direction. |
