6.3　Latticed Steel Gin Pole

6.3.1　The straightness for the centerline of latticed steel gin pole pair shall not be greater than 1/1000 of the length and 20mm.

6.3.2　The connecting bolts for latticed steel gin poles shall have their threads lubricated with grease during installation，and shall be fastened in turn in a symmetrical and diagonal manner.Bolts and nuts of unknown material shall not be used.

6.3.3　The following items of latticed steel gin pole shall be checked on a regular basis:

a）Main member；

b）Painting；

c）Welds；

d）Rotating part.