1970 年 19 巻 205 号 p. 861-864
The Hamanako Service Area on the Tomei Highwayline is noted for its beautiful scenery, and the area is a sort of ordained by the Government order as scenic zone. For the purpose of protecting it from breaking down of the rock slopes along the main route at the Service Area, the most effective method must be thought of.
If such artificial methods as the mortar spray method and the block method were used, there is danger of damaging the scenery. So such a method as to be free from these faults was devised, i.e. to stick the rocks together by a binding agent and so to protect the rocks from breaking down.
The binding agent used there in was made of epoxy-resin, which had been used at the preservation works of Meotoiwa in Futamigaura on 1968, which had been accredited to the authors as success. The injection began on the large cracks and then applied to small ones. The viscosity and the hardening time of the agent must be adjusted to the changes with the dimensions of the cracks. At the surface where the binding agent apeared, the fragments of rocks of the same colours were put on. By this method the rock slopes were stabilized and the beautiful natural colours of the rocks have been perfectly preserved.