Bridge expansion joint structure and construction method thereof

An easily maintainable assembly-type bridge expansion joint structure, comprising:

• two to-be-connected bridge beam end, wherein a groove platform is provided on each of the two to-be-connected bridge beam ends in an extending direction of a gap;
• two connecting box bodies, wherein each of the two connecting box bodies is fixedly arranged on the groove platform of each of the two to-be-connected bridge beam end, and a box chamber is provided on opposite side surfaces of the two connecting box bodies respectively, a plurality of box chambers are provided, which are open opposite each other, and the box chamber is provided in the extending direction of the gap;
• at least one cross beam, wherein the at least one cross beam is connected to the two box bodies via the box chambers respectively, and bottoms of the two ends of the at least one cross beam is connected to an inner bottom plate of the box chamber that is open opposite each other via a first elastic supporting seat respectively;
• a side beam, wherein a number of the side beam is two, the side beam spans the at least one cross beam in the extending direction of the gap, a bottom of the side beam is connected to a top of the at least one cross beam via a second elastic supporting seat, and a top of the side beam is fixedly connected to a top of the box chamber;
• at least one middle beam, a bottom of the middle beam is fixedly arranged on the at least one cross beam and located between the two side beams, and two sides of a top of the middle beam are elastically connected to the tops of the two side beams via an elastic telescopic piece respectively, a groove in the extending direction of the gap is formed between the side beam, the elastic telescopic piece and the middle beam, and the groove is configured to be filled with silicone gel;
• each of the two connecting box bodies comprises an L-shaped full-length steel plate matched with the groove platform in appearance, a displacement box and a concrete platform, a plurality of displacement boxes are provided and a plurality of concrete platforms are provided, the displacement box is arranged in the box chamber on a steel plate at intervals in the extending direction of the gap, and the concrete platform is fixedly installed or poured between adjacent displacement boxes;
• and
• a rubber gasket is arranged between the displacement box and the steel plate, the displacement box is connected to a pre-embedded connector of the groove platform via a bolt, the bolt sequentially penetrates through bolt holes on vertical side surfaces of the displacement box, the rubber gasket and the steel plate and is connected to the pre-embedded connector of the groove platform, and the pre-embedded connector comprises a connecting steel bar and an internal threaded sleeve fixedly connected with the connecting steel bar.