Sinking-assistant construction method for sinking sunk well

The invention relates to the construction field of a highway bridge, in particular to a sinking-assistant construction method for sinking a sunk well, comprising the following steps of: (1) uniformly embedding hollow sinking-assistant pipes around the outer periphery of the well wall of the sunk well in the position 0.8-1.2m far away from the outer side of the well wall of the sunk well (1); (2) compressing high-pressure air into the upper end of each sinking-assistant pipe through an air compressor by pipelines to loosen soil bodies around the sunk well; (3) injecting high-pressure water to the sinking-assistant pipes from the upper end of each sinking-assistant pipe through a high-pressure water pump to destroy the soil bodies at the periphery of the sunk well, thereby reducing the sinking resistance of the sunk well; and (4) checking whether the sunk well is sunk in place, if not, sustaining 25-35 minutes, newly returning the step (2), and then finishing after the sunk well is sunk in place. By repeatedly