Splicing method of pinnacle steel member

The invention discloses an assembling method of a pinnacle steel member. The assembling method comprises the steps that a left main part and a right main part of the pinnacle steel member are assembled in a horizontal mode; the left main piece and the right main piece are connected into a whole through a connecting rod piece in a vertical mode; determining a plurality of lifting points from the lower half part of the pinnacle steel member; and integrally hoisting the pinnacle steel member to a mounting position through the hoisting points. According to the method, the pinnacle steel member is decomposed, the pinnacle steel member comprises the left main piece and the right main piece of the force bearing piece and the connecting rod pieces arranged in a layered mode, splicing is conducted according to the mode that the part is spliced first and then the whole is spliced, and the splicing quality of the pinnacle steel member can be guaranteed; a special assembly jig frame is not used, the whole assembly proces