Practice and staettebuk for classification under the water of cameras that cross over obstacles

摘要

Method and apparatus for laying an underwater pipe to straddle an already laid pipe, comprising fastening to the pipe to be laid, at appropriate distances apart, a set of trestles the heights of which are gradually increasing and decreasing consistent with the bend to be imparted to the pipe to be laid in order to have it positioned in the correct straddling relationship relative to the already laid pipe. Each trestle is connected to the pipe to be laid by flexible means which allow the trestle to move vertically, longitudinally and traversely relative to the pipe and to be suspended below and separate from the pipe as the pipe and trestle descend to the sea bed for proper positioning of the trestle substantially independent of the pipe.