During the decelopment of the oil tanker harbor， the modern dock for heavy oil tanker entering， especially the dock sets up with isolated mound， its surface aren’t continuous and its elevation is higher than nomal one. The oil tanker has serious jounce， floating in higher frequency and its range is very big when the oil tank is moored. The problem is hard to solve by the tanker’s own ladder because of the distance between oil tanker and the edge of the dock. To speed up the loading and unloading process and to ensure the safety of the operaters and crews， it is natural for the modern large oil tanker to replace own ladder with ourGangway Tower. Just like Loading Arm， Gangway Tower becomes irreplaceable advanced equipment being used in tanker dock area.

Although having simple function， Gangway Tower needs good technological performance considering its surrounding circumstance. I order to suit the queasy condition and some unexpected things between ship and dock， the harbor’s hydrology and meteorology and a lot of detail information relevant about berthing ships should be analyzed carefully， to decide its suitable working conditions and choose correct construction and reliable safeguard. After that， it can achieve our expectations. 

The Gangway Tower consists of a standing column， hanging ladder and relevant auxiliary structure， elevator mechanism， slewing mechanism and front ladder adjusting machanism.