Cement concrete expansion joint structure with large area ground, and implementation method thereof

The invention discloses a cement concrete expansion joint structure with large area ground; the structure comprises a cushion layer (1), concrete plates (2-1, 2-2 and 2-3), main expansion joints (3-1 and 3-2) and a secondary expansion joint (4), wherein the main expansion joints (3-1 and 3-2) are arranged among the concrete plates (2-1, 2-2 and 2-3); the secondary expansion joint (4) is arranged on the concrete plate (2-3); a 'comb-teeth-shaped' cross section is formed by the concrete plate (2-3) and the secondary expansion joint (4); extruded plates (5-1 and 5-2), a flexible filler and a flexible sealing material are filled in the main expansion joints (3-1 and 3-2); and the flexible filler and the flexible sealing material are also filled in the secondary expansion joint (4). The cement concrete expansion joint structure effectively eliminates the destructive power of temperature effect for the ground concrete, and the set widths of the expansion joints are very narrow, so that the joint hole concrete expos