Underground Utility Tunnel Expansion Joints
Underground Utility Tunnel Expansion Joints
(OP)
I am working on a project that includes an underground CIP concrete tunnel connecting three different structures. The tunnel houses utility piping and will also be used by staff to cart laundry/food between buildings. The tunnel makes a "T" shape, with the stem of the T being approximately 200 feet, and the top of the T being approximately 370 feet. The question was raised as to whether or not we need to have expansion joints in the tunnel at intermediate locations between the three ends.
I have designed underground tunnels without intermediate expansion joints in the past, but not tunnels this long and with intersecting tunnel segments. However, I would not expect much thermal expansion with the tunnel being buried underground. Does anyone have any input on this issue? Are there any references that may be of use?
I have designed underground tunnels without intermediate expansion joints in the past, but not tunnels this long and with intersecting tunnel segments. However, I would not expect much thermal expansion with the tunnel being buried underground. Does anyone have any input on this issue? Are there any references that may be of use?






RE: Underground Utility Tunnel Expansion Joints
Have you considered precast sections rather than CIP?
Maine EIT, Civil/Structural.
RE: Underground Utility Tunnel Expansion Joints
Any moisture conditions to deal with? In my experience, it takes a true construction master to correctly install waterstop.
RE: Underground Utility Tunnel Expansion Joints
There are not any unusual moisture conditions to deal with on this project.