Two-piece main boom for a latice-boom crane and method for erection thereof

摘要

The present invention discloses a kind of method of setting up and dismantling the arm of two-piece main at least of lattice boom crane.The described mode that causes adopting the effecive lever arm (1 ') reduce main arm (1,2) during setting up and dismantling with unloading process of setting up utilizes how much kinematics characteristics of main arm (1,2) to prevent that hoisting crane from tumbling.Described main arm (1,2) is located bending at hinge-point (A), and at least two arm parts (1,2) are connected to each other together at this hinge-point place, thereby forms one jiao of position between described two arms parts (1,2).In the time of in described lever arm is in acceptable limit, described arm is risen, thereafter each arm is partly aimed at and locked.The present invention also discloses a kind of arm and has the hoisting crane of this arm.