To carry out stable operation by uniformly spraying a vegetation base material against an ultrathick layer as exceeding the thickness of a thick- layer wire gauze while ensuring a scaffolding for spray operation.
A water-collecting mat 3 is laid on the face of a slope. A thick- layer wire gauze 4 is fixed onto the water-collecting mat 3. Upper-layer support members 5 with net-shaped or porous foundation piece sections 5a and net- shaped or porous upright piece sections 5b erected and formed from the foundation piece sections 5a are fastened onto the thick-layer wire gauze 4 continuously in the cross direction of the face of the slope at intervals in the longitudinal direction of the face of the slope, and a vegetation base material is sprayed in an extent that the upper-layer support members 5 are buried.
GOUTO KENJI
TANIMOTO MASAFUMI
