Track plate replacement operation method

The invention discloses a track plate replacement operation method, which comprises the following steps of: transporting a plurality of gantry cranes, a hoisting tool and a new track plate to an operation site by adopting a transport flatcar, unloading the gantry cranes in place according to the position and sequence, and uniformly deploying the gantry cranes at the position of a track plate to be replaced along a track line. And then a group hoisting system composed of a plurality of gantry cranes hoists and places the new track plate at a designated position through a hoisting tool, the steel rail fasteners are dismounted, and the steel rails at the position of the track plate to be replaced are shifted to the two sides of the track plate. The hoisting tool is hoisted through a group hoisting system composed of a plurality of gantry cranes, and new and old track plates are hoisted through the hoisting tool, so that replacement of the track plates is achieved. And finally, the old track plate is hoisted to t