| 摘要 |
PURPOSE:To enable a ship to safely and simply come alongside and off a harbor, by disposing a concrete structure having its outer surface provided with a magneitc cement concrete, in the sea water along as hip sailing way and providing a magnetic sensor in the ship. CONSTITUTION:A concrete structure having its outer surface provided with a magnetic cement concrete consisting of a cement group material and a ferrite is disposed in the sea water along a ship sailing way so that a guide 1 for introducing a ship into a harbor and bringing the same alongside a pier is formed. A magnetic sensor 4 provided in the ship is submerged into the seawater to detect the magnetism of the guide 1 for knowing the position and course of the ship A, thereby the ship A may be safely and simply introduced into the harbor B and brought alongside the pier. |
