Expansion joint for electrical duct bank and vault.
Expansion joint for electrical duct bank and vault.
(OP)
I am looking for design guidance/details on expansion joints that can be used at intersection of concrete duct and electrical vault to prevent severing the conduits due to differential settlement during an earthquake.
Any recommendations are very much appreciated.
Any recommendations are very much appreciated.





RE: Expansion joint for electrical duct bank and vault.
During a significant seismic event you may break the walls of the vault, but the electrical service has a reasonable chance of continuing to operate. We used this approach at electrical power stations where keeping the units running was more important that worrying about damaged vaults.
www.SlideRuleEra.net
RE: Expansion joint for electrical duct bank and vault.
Thanks for the recommendation. We have used similar method. I am looking for some kinda of coupling joints such that the vaults wall will not be damaged. We have 3 circuits of high voltage, underground transmission and distribution conduits, some are encased in concrete duct bank, that will sit above or next to a proposed highway tunnel.
Thanks.