Embedded pressing type waterproof and dustproof bridge expansion device, waterstop and method

The invention relates to the field of bridge expansion joints, in particular to an embedded pressing type waterproof and dustproof bridge expansion device, a waterstop and a method. Comb plates are installed on the two sides of the expansion joint, the comb plates on the two sides are staggered with each other, a pressing plate is welded or integrally manufactured below the comb plates, the dustproof sliding plate is fixed below the pressing plate and the comb plates and is in a right-angle shape, the lower portion of the pressing plate presses the side portion and the position of the portion, rebounded after being pressed, of the water stop belt of a U-shaped structure. Side parts with rebounding parts after being pressed are arranged on the two sides of the water stop belt, and the structure generates rebounding force when being extruded by external force. The technical problem that a waterproof system of the telescopic device is easily damaged under the action of an external environment is solved; the prob