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  Development of Innovative Connections for Pipe Umbrella Support Systems

  Pipe umbrella support systems have been used successfully for tunneling in challenging ground conditions since the 1970’s. Historically, the drilling unit was the limiting factor for pipe umbrella installations - less attention has been paid to pipe couplings and their influence on labor time and load-bearing capacity. The present paper describes the development of two new alternative connection types compared to conventional threaded connections. The first new connection type is the nipple coupling. It consists of a threaded connection which is pressed and welded into the ends of standard tubes. A second type is the squeezed connection, which mechanically connects non-threaded pipe ends in terms of forcefitted squeezing onto a drill rig.

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