... large prefabricated reinforced-concrete products (such as caisson, box culvert, and bridge), oil drilling equipment and integrated building, etc.2. ... the projects of wreck salvage, pontoon bridge installation, dock building, underwater transmission pipeline installation, etc. in many ways.3 ... rubber airbag,Lifting Airbag,Upgrading Airbag ,airbag used as formwork in construction of pipe culverts