METHOD FOR CONVERTING RIVER-BED BLOCK OR FOUNDATION-CONSOLIDATION BLOCK INTO WOODY MATTRESS

摘要

PURPOSE: To prevent the channel washing of a river-bed and a shore, and conduct revetment while providing a living and spawning place for fish and shellfish, to breed fish and shellfish and to create natural environment by converting a river-bed block or a foundation-consolidation block laid on the bed of a river into a wooden mattress. CONSTITUTION: A frame body made of a metal is placed on the top face of existing river-bed blocks or foundation-consolidation blocks 1 or the like consisting of concrete, and hooks 5 attached to the frame body and hooks 2 for connection annexed to the blocks 1 are connected and unified by connecting fittings 6. Bolts 9 are disposed in upright to nuts 8 welded to the frame body made of the metal, a proper number of stages of wooden levers 10 are inserted alternately into the bolts 9 in a well-crib shape at every opposed two side, and the upper ends of the bolts 9 are clamped by nuts 11, thus unifying the river-bed blocks or the foundation-consolidation blocks 1 or the like and a large number of the wooden levers 10.