Sunday, November 27, 2011

RE: Flanges Bolt Head direction

Apparently this is a Rohn tower with flange plates.  Although that is not really all that relevant to the issue.
The main reason the bolt heads are down is that you can get a wrench on the nut on top and let gravity help as you thread the nuts from above.  If the nut does not engage with your gloved hands, releasing the nut will not result in dropping the nut onto your iron worker colleague below thus avoiding injury, consternation, verbal expressions of anger, and potential retaliation.  This is iron worker 101 stuff. 
Placing the bolt from below and the nut on top is fairly standard in the iron worker world.  You want to look down at the nuts and hold the bolt head from below.  If you require tensioned bolts, the match marks are placed on top where they are easily viewed.  If you use DTI washers, you want to put the feeler gauges in from the top. 

Regards, Harold Sprague

Subject: Flanges Bolt Head direction
Date: Sun, 27 Nov 2011 17:54:09 +0200


Is anyone could give some recommendations for the direction of the bolt heads in a communication tower?

The contractor had designed the tower assembly with head bolts directed to ground, by maintenance views I'd preferred to see them assembled with heads directed to the top of the tower, but is anyone could give some other reasons?




David Cohen


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