With the help of this new type of airbags, we successfully moved a well-known ancient sunken ship of the Song Dynasty named "NanHai No. 1" for 400 meters intact horizontally from the beach to its permanent exhibition site within only two days in 2007, a sensational achievement that stunned the world at the time. Since then, caisson moving with airbags has become the mainstream method in China and accounting for over 70% market share.
Diameter: Dia1 .0m airbags are the commonly used for caisson moving, and for the smaller sized caissons, Dia 0.8m airbags are ideal one.
Effective Length (Le): In principle ,the effective length(Le) could be the caisson width plus 0.5m. Usually if caisson width> 20m, airbags can be arranged as two rows.
Operating Pressure of Airbags : Actual Bearing Capacity of Unit= Weight of Caisson (G)/Total length of airbags (Le x N1). The category of airbags is decided by the final figure of Actual Bearing Capacity of Unit x 1.2, and then take this figure to refer to the Specification Sheet of Airbags. (N1 stands for the pieces of airbags under caisson body)
NO.s of Airbags (N): The numbers of airbags for caisson moving is the pieces under caisson body (N1) plus the spare ones in front of the caissons (N2). The gap of airbags arrangement is about 2m under caissons, so N1=Length of Caisson (Lc)/2+ 1; the NO.s of spare airbags is decided by the distance of moving, and generally it should be more than 5 pieces.