Four-machine hoisting mounting method

The invention discloses a four-machine hoisting mounting method. The four-machine hoisting mounting method comprises the following steps that the lower portions of every two of four travelling cranes are connected with an auxiliary hanging beam, the lower portions of the two auxiliary hanging beams are connected with a main hanging beam, and the main hanging beam is provided with a plurality of hanging points; the hanging points on the main hanging beam are selected according to the weight of equipment to be hoisted, and lifting lugs on the equipment to be hoisted are connected with the hanging points on the main hanging beam through a plurality of steel wire ropes; and the four travelling cranes are controlled to conduct coupling at the same time, the equipment to be hoisted is made to slowly leave the ground, and after the equipment is hoisted to a mounting position, the equipment slowly falls back, and other equipment is assembled. According to the four-machine hoisting mounting method, a plurality of sets of overweight equipment can be hoisted through four-machine hoisting, the process of hoisting large equipment is simple and convenient, the technologies of previously adopting large-tonnage automobile crane hoisting and hydraulic lifting hoisting are changed, and the beneficial effects of being convenient to operate and high in safety are achieved; and the mounting period can be greatly shortened, and meanwhile the hoisting cost is reduced to a large degree.