Tools for Installation of bolts requiring Full Pre-Tensioning?
Tools for Installation of bolts requiring Full Pre-Tensioning?
(OP)
Our company has provided a moment connection design using the minimum offset for entering and tightening clearances at 1 1/4" diameter bolts (1 11/16" side clears per pg 4-137 of the 1989 AISC ASD manual).
Lo and behold - the erector cannot complete full pre-tensioning of these bolts using standard equipment. His attempts to locate tools to tigthen the bolts adequately and that fit in this clear dimension have been unsuccessful.
Any suggestions?
Lo and behold - the erector cannot complete full pre-tensioning of these bolts using standard equipment. His attempts to locate tools to tigthen the bolts adequately and that fit in this clear dimension have been unsuccessful.
Any suggestions?





RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
http://www.newmantools.com/ozat/16lt.htm
http://www.norbar.com/NTTI/MainMenu.htm
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
Are you breaking the drive head off
when tightening or are you actually
breaking the sockets because of the
thin section?
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
Best regards,
Matthew Ian Loew
"Organizations cannot make a genius out of an incompetent. On the other hand, disorganization can scarcely fail to result in efficiency." -- Dwight D. Eisenhower
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
Dick
Dick
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
As someone stated in another post ask me how I know.
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
It appears that snug tight installation will be an acceptable solution for the A325 bolts, but I'm still at a loss on the A490s.
Thanks to everyone for their responses.
ChuckerD
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
Hg
RE: Tools for Installation of bolts requiring Full Pre-Tensioning?
The welding process to change a tool can be done by one of the major tool companies. They will do that for you if you contact their engineering departments, but it is not an inexpensive thing to have them do. I would look at the torque multiplier and using lubrication. With the selection of the proper lubrication, you should be able to get the K factor on those parts down to the point where they can be fully tightened in the 1,400 ft. # range.
Dick