Box Truss

**FWI** · 11-30-2011, 04:56 PM

Here's a 50ft truss I made.

**vicegrip** · 12-06-2011, 02:28 AM

A cool pic but no supporting text ?
95 views , no comments?

What is this national do not type day ?

vg

**FWI** · 12-06-2011, 05:45 AM

VG,

This is a replacement box truss for a substation here locally, I believe it holds switches. The original truss had been damaged by weather and age. So this one is to be G90 galvanized then delivered to Duke for the shut down to replace the old one.

**vicegrip** · 12-06-2011, 11:44 AM

Thank You...... Cool..

We used to have two outfits specialising in that class of fabrication.
Think both are gone now.
vg

**FWI** · 12-06-2011, 03:56 PM

We've completed quite a few of similar jobs but the market is very, very competitive and the dead lines for work are very strict. Sorry to hear about your local shops.

FWI

**Dan Timberlake** · 01-20-2012, 11:20 PM

Did the original have the joints for the top and bottom panels in the middle of the chords, away from the joints
of the side panels?

**FWI** · 01-21-2012, 07:24 AM

@Dan Timberlake

This was not a duplicate piece of an existing it was a new fabrication per my customer's drawings and specs. Although the original piece was damaged this truss was resigned to hold 12,000lbs more than the original. I hope this answers your question.

See pictures below of other box trusses I've fabricated where the diagonal braces frame to one working point. You'll note many differences like continuous 3/4" holes 3" c/c down the entire length, larger diagonal bracing but miter cut into the outstanding leg of the framing angles, no exterior diagonal bracing as seen before, additional X bracing threw out these box trusses.

I've built 100's of these things and I've yet to build two that are the exact same. Note the trusses stacked on the bottom picture both going to the same site but look how difference they are I really don't have an answer why the PE decides to build them the way he/she does. I'll keep you posted I have to build 40 more trusses in Feb and I'll post those pictures as well.