What are the time and item of maintenance of launching crane?
After construction are finished everyday, the workers must check the following content of bridge girder launcher:
if the level of main longitudinal girder meets the requirements or not; the connection of bolts and pins are firm or not;
the electrical wires are broken and extruded; hydraulic system is regular or not; the track joints are plain and smooth or not;
the connection of position limiter of crane and trolley are firm or not; the rail clamping device is in the working position or not;
bed timber is plain and stable and the size of gauge is right or not etc.
The welding lines are checked every month :：upper and down chords of main girder , web plate, vertical welding lines of legs
and the welding lines of connecting frame etc. The operators should stop working when the welding lines are broken or fatigue crack.
When the users find the crack by eyes, but they can’t make sure the dangerous degree, so they should use the welding inspection
instrument to test and then adopt reasonable steps to deal with.
About the painting of structure which should be painted again every two years. The users should clean the primary surface by steel brush
and pay attention to the welding lines before the structure are painted.
The lifting mechanism, traveling mechanism of crane and trolley, reducer of motor and steel rope of winch are lubricated and maintained
according the rules of specification.
