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The large steel pipe is an intermediate reference datum of distortion measurement systems for measuring ship.On the one hand,it provides optical path for measuring pitch angle and yaw angle,on the other hand,it offers a long optical level mainly for precision measurement of roll angle.It is required that not only the large steel pipe is positioned firmly but to prevent force caused by ship deformation from transmitting to the pipe.Hence precision measurement of its fixing supports is needed,for the purpose of making its datum plane parallel to that of the ship,and keeping the height of supporting pedestals within certain tolerance range.