Review article

The article considers some modern technologies of submerging cofferdams, with the depth exceeding 15-30 m and diameters over 30 m. The technological parameters providing the productivity improvement of soil extraction from the cofferdam are studied. The authors propose using the technology of soil transportation on belt conveyors fixed through special cantilever elements on the inner surface of the cofferdam walls. Sequentially, several belt conveyors get installed along an upward spiral path along which the soil is supplied from the bottom hole to the soil surface with the excavator. While the cofferdam is being submerged, subsequent sections of conveyors get installed.