The invention relates to
underwater arrangement, in particular to arrangement of a
geotextile-
geogrid complex which can play a role in isolating soil, reinforcing and reducing soil body deformation in soft foundation treatment projects such as reclamation projects and the like. In channel improvement projects, the novel technology is mainly used for protecting riverbed bottom matters in an arrangement range from being eroded by water to fulfill the aims of protecting the bottom and feet, preventing downcutting and protecting the
engineering foundation. The conventional
underwater arrangement lacks a key technology, so that the arrangement range and the axis deflection are difficult to control accurately, even phenomena of geo-mattress torsion, floating and the like occur, and the foundation stability and
engineering quality cannot be ensured. The invention provides a novel quick and reliable
underwater arrangement technology. In the technology, four important procedures, i.e., positioning, tiling, ironing and ballasting of the geo-mattress are combined organically by using the principles of tip anchoring, lower board arrangement
barrel ironing and binding and throwing combination ballasting, so that the influences of load effects of wind,
waves and the like and tide rise and fall on the construction during offshore operation are eliminated effectively, the geo-mattress can be quickly and accurately tiled on a
coating surface, and the working efficiency is increased manifold.