We Japanese people have more difficult geographical contitions to live compared to European countries.
The percentage of inhabitable part in the land of representative European countries such as Germany, France and UK is more than 65% at least.
In contrast, Japan only has 27.3% of it (Source: Geospatial Information Authority of Japan).
In other words, we have to construct inhabitable area and infrastructure including roads and railway among mountains to maintain lives of our large population.
Since in these living environment, the quality of slope protection work is directly related to our lives. Needless to say, highly reliable construction is required.
Slope stabilization work which is not only erosion control but also one to prevent sediment disaster and landslides is tend to be implemented by a handful chosen constructors in each region.
Daisho Co., Ltd. is one of those companies which also has uniquely refined methods to prevent landslides.

For professional construction companies, capability of design work is necessary in order to offer and carry out better construction.

How do you drill slopes for nails when you face to following conditions?
- It is too high to build scaffold or plat form for a drill machine.

- It is too narrow to bring in drill attached to  heavy machinery.

• It is required not to cut down trees, but have to drill natural slopes among trees.

SD method is the solution under those conditions.

Interaction between nails, unit-net and bearing plates are effective for stabilizing slopes. Forest conservation and natural slope reinforcement can be done simultaneously. Technology to drill among trees, such as SD method is required.

Crib Work suppresses slope and prevent surface erosion by itself. It is most frequently used in combination with anchors and nails to prevents landslide and failure. There are two main types of crib work for each purpose.

Soil nailing is an also popular work in Japan. It is a relatively small scale of construction to prevent surface failure. In most cases in Japan, it's not covered by shotcrete but implemented with crib work or other method related with wire net in natural slopes.

We are engaged in collaborative research and development with universities to further enhance the company's technology. As an achievement announcement, we publish papers at some international conferences.