| 摘要 |
<p>PURPOSE:To prevent occurrence of excessive tensile force under gryogenic temperature by arranging a curved offset in the way of a pipe then pulling a cable therethrough thereafter pushing the cable therein. CONSTITUTION:A pipe 10 is normally straight and a curved offset 12 is arranged in the way. Upon finish of pulling-in of a cable 20, axial compression force is applied through a winch, for example, onto the end section 20a thereof thus pushing the end section 20a into the pipe 10. Since the cable 20 is initially bent slightly at the offset section 12, the cable starts to bend easily and curved as shown at 20b. When the cable 20 is pushed in furthermore, curved sections 20c, 20d, 20e... are formed in the vicinity of the curved section 20b. Thereafter, the cable 20 is jointed. Preferably, the length of the offset 12 is 5-15m and the height of the curved section is 1-3 times of the pipe diameter.</p> |
