| 摘要 |
PROBLEM TO BE SOLVED: To enhance the stability of a piping structure in an earthquake-proof joint structure for cable protective tube including a bent section and an extending and contracting section.SOLUTION: An earthquake-proof joint structure for cable protective tube includes: at least two bent sections 10 which allows bending in a tube axial direction, and an extending and contracting section 20 which allows extension and contraction in the tube axial direction, the extending and contracting section being provided between the two bent portions 10. The extending and contracting section 20 includes a sliding portion 25 in which an inner tube portion 21 and an outer tube portion 22 are slid in the tube axial direction, and a rubber ring 23 is provided at an end of the inner tube portion 21 or outer tube portion 22 of the sliding portion 25. The rubber ring 23 has water-stopping function and locking function for the sliding portion 25. |
