Hydraulic iron pipe structure for hydroelectric power plant, construction method of the structure, and sheath pipe

摘要

To provide a large-bore ductile cast iron pipe that can stands high-external pressure.SOLUTION: A large-bore ductile cast iron pipe 1 has a ratio D/t of an outer diameter D to a net pipe thickness t as 45 or less, thereby standing high-external pressure with 2.0 MPa or more of external pressure resistance.SELECTED DRAWING: Figure 1