Tapping subterranean pipes.

摘要

Subterranean service pipes (1), eg. water mains, are tapped by minimal excavation to expose the upper half of the main and then locating (with respect to the main) a conventional pipe-tapping device (8) but without employing means encircling the pipe, thereby minimising excavation and reinstatement costs. Thus, a clamp (5) can be used, or a saddle adhesively secured to the pipe. The clamp or saddle preferably provide means for proper orientation of the drilling and tapping tool (8) with respect to the main.