Drainage of shotcrete lining with drainage pipes

摘要

The method involves manufacturing drainage pipes (4) by two pieces which are connected to each other. The drainage pipes are provided with a provisional closure at air-side end of a stacked together pipe for the duration of the manufacturing of a sprayed concrete shell. The drainage pipes are constructed from standard product. A spigot of a partial pipe is overstretched with the geotextile. An independent claim is included for a drainage pipe for the execution of the method.