Oriental Shiraishi Corporation produces, constructs, and sells prestressed concrete products and structures in Japan. It operates through three segments: Construction Business, Steel Structure Business, and Port Business. The Construction business segment engages in construction work and manufacturing/sales of prestressed concrete civil engineering structures, pneumatic caissons; repair and reinforcement work for bridges, prestressed concrete building structures; and design and construction, design and production of construction equipment, civil engineering contracting, and rental of construction machinery. The Steel Structure Business segment involved in the design, manufacturing, erection, repair and reinforcement of steel structures such as bridges. The Port business segment operates port, civil engineering, and construction work. It also engages in the design and construction of earthquake-resistant buildings; and the sale of construction materials and devices. In addition, the company generates, supplies, and sells solar power through the operation and administration of solar power plants. Oriental Shiraishi Corporation was incorporated in 1952 and is headquartered in Tokyo, Japan.