To stably fix a cage frame forming a slope of steep grade banking on a ground and also easily performing the fixing.
A sheet-shaped reinforcing material is locked to the bottom surface of an L-shaped front net body A formed of a bottom part and a front surface part using the mesh spaces of the reinforcement material and the hook- shaped engagement part of the front net body A, and laid down at the rearward from the rear end part of the cage frame where the rear end part of the reinforcement material is formed of the net bodies A and B extensively to a position at least 0.5 times the depth of the cage frame. In addition, a small hole-shaped engagement part for the L-shaped rear part net body B formed of the bottom part and a rear surface part is erectedly engaged, on the reinforcement material, with the hook-shaped engagement part of the front part net body A, and an end part net plate is installed at both ends of the side surfaces. Soil and sand are filled in the soil retaining cage frame to form a slope, and soil and sand are built up to that height to build a first stage of banking with buried reinforcement material. This operation is repeated in order so as to build a multiple stage banking.
HATAE SHUNICHI
NISHIMURA ATSUSHI
MITSUI SEKIKA SANSHI KK
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