| 摘要 |
<p>PROBLEM TO BE SOLVED: To protect transmission cables embedded underground when the ground level fluctuates due to an earthquake. SOLUTION: In the inside of this protective piping where a pair of jointing base plates 1, 1 provided with four cable insertion holes 3 drilled are jointed with a protective cover 6 assembled so that outer piping 6a and intermediate piping 6b may slide each other, and which is covered with a protective cover 6, respective cable insertion holes 3 are connected individually with each other through rubber corrugated piping 2. The protective cover 6 and corrugated piping 2 are integrally-jointed to the respective jointing base plates 1 by fixing plates 7.</p> |
