Development and technical promotion of rubber products; Production and sales of waterstop, bridge bearings, basin workers bearings. Spherical bearings, hoists, gates, casters, anchorages, foam boards, expansion joints, corrugated pipes, corrugated pipe culverts, guardrail supports, grouting pipes, shield components, sealants, plastic blind ditches, permeable pipes, building waterproof materials, waterstops, waterproof boards, steel wire sleeves, iron horse stools, safety nets, road signs, inflatable core films, waterstop steel plates, acoustic pipes, butyl rubber direct adhesive tapes Geotechnical materials; Installation and maintenance of bridge bearings, bridge expansion joints, waterstops, waterstops, waterstops, anchors, bellows, and water collecting guardrail supports; Bridge deck and tunnel