When working, there is a pressing device (cylinder piston rod or screw) to push the pressure fence, and press the gland and the water stop wing ring between the pressure fence and the thrust plate. The filter chamber is formed in the middle, and the material pressed by the material pump enters each filter chamber from the thrust plate feed hole. The solid particles are trapped in the filter chamber and form a sealed castable. The water passes through the sealed castable and water stop.