Expansion joint
Expansion joint
(OP)
Dear Friends,
I have a question about nut gap of axial expansion joints.
When should we use rod with outside nut gap in "axial expansion joint"?(As we know outside tied rod can withstand pressure thrust thus I think always using of outside tied rod is preferred)
I have a question about nut gap of axial expansion joints.
When should we use rod with outside nut gap in "axial expansion joint"?(As we know outside tied rod can withstand pressure thrust thus I think always using of outside tied rod is preferred)





RE: Expansion joint
RE: Expansion joint
h
RE: Expansion joint
Always We prefer control pressure thrust. Thus we should tie outside nuts.
ione said:
"If rods are present but axial movement is partly allowed then we are talking about limit road."
When we can use control rod with outside nut gap? (i.e. in which cases axial movement is partly allowed?)
RE: Expansion joint
First, be sure we're talking the same language. EJMA and FSA have different and conflicting terminology for expansion joint rods. Are we talking metal or rubber expansion joints?
Regardless of terminology, if there is any axial movement in a non-pressure-balanced expansion joint, the anchors must be designed to withstand the pressure thrust.
- Steve Perry
http://www.linkedin.com/in/stevenhperry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.
RE: Expansion joint
RE: Expansion joint
If there is only axial compression to be considered, then the nuts are tight against the tie plate.
rmw
RE: Expansion joint
So, you may use a control rod on a rubber expansion joint without regard for its function. As others have said, back off the nut to allow axial expansion. But your anchors still need to be designed for pressure thrust in my opinion.
On a metallic expansion joint EJMA governs and uses different names for such devices. It would not be proper to say "control rod" for a device that allows a single bellow expansion joint to take axial expansion, though the principle is the same.
- Steve Perry
http://www.linkedin.com/in/stevenhperry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.