STRUCTURE FOR PROTECTION OF BIOLOGICAL ENVIRONMENT IN PROTECTIVE WALL FOR RIVER, SAND, OR MOUNTAIN AREA

摘要

PURPOSE:To facilitate maintenance of biological environment and protection of small animals by disposing structural bodies consisting of a plurality of cylindrical entrance/exit members having a forward end aperture part opening at a joint part of a unit block body and a main body member including a large space. CONSTITUTION:A structural body 20 is formed by connecting a main body member 25 including a large space part 26 with a plurality of a cylindrical entrance/exit members 21 having a forward end aperture part 22 opening on the outer side of a joint part 2 of a wall surface block body 1 such as a protective wall for a river, mountain area, etc. The extended parts of the entrance/exit members may be connected with each other without providing the main body member 25, or they may be composed to be connected with each other by a branch member in the middle part to have a branch passage. The structural body 20 (10) is embedded with at least one entrance/exit member 21 inclined in a horizontal surface or a vertical surface for nests formed by river fishes, birds, etc., and discharge of sand or other foreign matters and drainage are facilitated.