Coating underground shaft, gallery or tunnel walling - involves spraying or centrifuging colloidal or concealed cement and water mixture

摘要

The coating medium is designed to cling to tunnel walls and includes cement for bonding. It sets hard to form a strong cladding for the walls of horizontal, sloping or vertical tubes in the ground, such as boreholes, shafts, galleries or tunnels. The walls are sprayed or centrifuged with a colloidal or congealed mixture of cement and water, with or without aggregate and reinforcement. Thic can involve a supply load (7) centred in a chassis (5), coaxial with the tube (2) axis, and a revolving distributor head (9) on a hollow shaft, with nozzles (10) facing the walls. There is a drive mechanism for either the shaft or distributor head.