Ship-building gantry crane is widely used for making the ship hull in shipyard, such as dock, shipway ect. It can lift, travel, elevate, fold and overturn and so on.
The crane is mainly composed of portal steel structure, double hooks, upper trolley, down trolley and travelling mechanism ect. Portal steel structure including double trapezoidal box girder, single box stiff-leg and herringbone flexible leg. Down trolley can travel freely under the upper trolley.
1. Nature condition
a. Air temperature:  -10℃+40℃
b.Wind speed:  max.working speed is 14m/s,non-working wind speed is 40m/s, the wind speed of wind system should≥55m/s
c.Humidity: average relative humidity 77%, max.average 85%, min.70%
d. Earthquake intensity:  degree 7
e. Degree of corrosion:  grade 10
2.main technical parameters
a.optional lifting capacity:50-900t
we will cite an example:  Muhz(120t+60t×2)
1.Cart moving speed   0-30m per minute (full load)
                      0-45m per minute (no load)
2.Lifting height    50m (above rail)    6m(below rail)
3.Working level    A5
4.Uptrolley    lifting capacity    2 × 60t
               lifting speed    0-5/0-8m/min
               moving speed     0-30m/min (full load)
                                0-45m/min (no load)
5.Downtrolley   lifting capacity   120/20t
                lifting speed     0-5/0-8m/min
                moving speed   0-30m/min(full load)
                               0-45m/min(no load)
6.Wheel press                        340KN
7.Span by wheel distance         40m × 20m
8.Power supply                  AC   10KV   50HZ
b. working system of main mechanism
Working system of crane:A5
Rating of crane: U5
Load regime of crane: Q2