Auxiliaries for construction purposes, namely, clay and clay suspensions as rinsing media and auxiliary media for drilling, for building diaphragm walls and tunnels, for driving pipes into the ground horizontally, for caisson, pit and shaft descent, for lubricating sheet pile partitions, as sealing compounds used for soil formations and rocks which are porous and permeable to water and for public landfill sites, as coating materials for underground cables, as additives for concrete and for tar, asphalt and bituminous emulsions