a, failure to specification requirements for ground endurance test, because of the foundation bearing capacity is not caused by tower
bridge gantry crane overturning
b, not request brochures construction, the foundation is too small for the tower crane various working conditions Stability
c, bolt homemade reach specification requirements, bolt fracture initiation tower crane overturning
d, anchor bolts and foundation welded steel. Due to bolt material mostly 45 # or 40Cr, welding parts prone to brittle fracture
1.4 tower crane attached undue cause accidents
a, the attachment point above the tower
overhead gantry crane independent lifting height exceeds specification requirements
b, attached to the pole,jib crane attached to pitch without calculation, design arbitrarily increase
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