Expansion device for deformation joints, pavement structure and construction method thereof

An expansion device for deformation joints which is installed in a groove above the deformation joint, comprising

• a displacement support plate which is positioned above the deformation joint and fixed on one of two sides of the deformation joint;
• an elastic support component comprising fixed bases fixed on two sides of the displacement support plate and a rigid telescopic member connected to the two fixed bases, the rigid telescopic member being fixedly suspended above the deformation joint and having elasticity in a direction of a connecting line between the two fixed bases;
• and
• an elastic body which fills the groove above the deformation joint and submerges the elastic support component;
• wherein two sides of the elastic body are connected to side walls of the groove above the deformation joint, and when the deformation joint expands or contracts, the elastic support component provides a deformation buffering force;
• wherein the displacement support plate is a steel plate, a rubber isolation layer is laid on the displacement support plate, and the elastic body is able to slide relative to the displacement support plate along with the rubber isolation layer, that during stretching or compression, the elastic body can move over the steel plate along with the rubber isolation layer;
• wherein the rigid telescopic member is arranged linearly and comprises an inner sliding rod, a sliding sleeve fitted over the inner sliding rod, and a first spring fitted between the inner sliding rod and the sliding sleeve;
• wherein the rigid telescopic member further comprises a second spring fitted over the exterior of the sliding sleeve, during the pouring of the elastic body, the remaining part of the second spring is bonded and cured together with the elastic body.