Transporting cementous material through a pipe for example at a coal mine

摘要

Cementitious grout is inserted into a pipe (22) and a mixture of aggregate and water is then inserted into the pipe (22), both components being transported together along the pipe (22) with the cementitious grout leading and the aggregate and water following. The aggregate and water cleans the pipe (22) and prevents any cementitious grout hardening on the internal wall of the pipe. The cementitious grout and aggregate is transported by air pressure from the ground surface to a mine face area where it is used to cast walls to support the mine roof. IMAGE