MULTI-NATURAL TYPE BULKHEAD UNDERGROUND WALL

PROBLEM TO BE SOLVED: To prevent erosion as a bulkhead wall at the time of flood without obstructing a natural environment, a landscape and a natural system by continuously burying underground walls composed of permeable concrete at a prescribed interval from the natural slope face of a river. SOLUTION: Underground walls 1 are continuously buried along a river 3 toward the underground from positions separated at prescribed distances from the slope shoulder 2a of the natural slope face 2 of the river 3. A permeable concrete plate or a sheet pile is used for the underground wall 1, projection and recess parts formed on sides are fitted and continuously successively positioned, and deeply inserted from a river bed 3a to sufficiently secure depth of embedment L so as not to expose the upper part on the ground. However, a panel-like box sheet pile as the inside is made hollow may be used. Thereby because the underground wall 1 is not exposed on the ground, a natural landscape is not damaged, and in addition, underground water freely moves not to obstruct a natural system. In the case of flood, the underground wall 1 is a bulkhead, so further erosion is prevented even if the natural slope face 2 is flowed out, and the natural shape face 2 after flood is restored by earth covering.