Construction method for plugging air gap between bottom hole of pier steel suspension box and foundation pile

The invention discloses a construction method for plugging an air gap between a bottom hole of a pier steel suspension box and a foundation pile. The method comprises the following steps of: (1) machining a skirt sleeve; (2) penetrating a skirt belt for the skirt sleeve; (3) fixing the presser foot of the skirt sleeve; (4) sleeving a pile with the skirt sleeve; (5) pretensioning the skirt belt; and (6) tensioning the skirt belt, wherein the skirt sleeve is drawn into a cone shape to clad the annular air gap between the bottom hole of the pier steel suspension box and the foundation pile. The method has high efficiency and quick and accurate skirt sleeve positioning and tensioning and solves the problems of low construction efficiency and poor plugging effect of the traditional construction method that after the steel suspension box is sunk in place, materials such as steel plates, gunny bags, concrete, and the like are used for manually plugging underwater.