×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Monorail Splice

Monorail Splice

Monorail Splice

(OP)
Looking at using a splice similar as shown to an S24 section. It is not intended to weld the S Sections, only to bolt them. The gap is approx 1/8". The monorail will only be used a few times. I intend to align the section and use slip critical fasteners in the splice. Max load is approx 35K.

Dik

RE: Monorail Splice

I've not seen a monorail spliced this way before, but I see no reaon why it will not work (assuming bolts are sized correctly)
I offer that the 1/8" gap may be a problem for the trolley wheels to roll over. We often weld across the top of bottom flange at the joint and grind it smooth. I have seen several occasions where even paint on a rail or lower flange will inhibit trolley wheel rolling.

RE: Monorail Splice

(OP)
I can try a small weld and grind it smooth... It can be disassembled/broken when the work is done. It's just temporary and I didn't want a 300' long continuous beam, and I didn't want a CJP weld as was originally spec'd. Bolts are overkill... more to retain some rigidity at the joint.

Dik

RE: Monorail Splice

Dik:
It seems to me that we have discussed this project before, you’re moving some heavy equipment in a tunnel or a mine, with tight headroom, or some such, right? I would not cope the one beam end, since that tends to hurt the support of the bottom flange. Why not just use a heavy web plate, welded to one beam end (web) and bolted to the other beam web. Maybe weld a heavy backer plate to the opp. side of web on second beam, then drill/punch the web and backer pl. for the bolted connection. This might also allow you to tighten up the joint gap. The problem with these joints is the differential deflections of the flange tips as the trolley wheels move over the joint gap, and load one flange tip and then try to climb to the other. They actually roll some S shaped (narrower sloped bot. flgs.) Tee sections with thicker flanges and webs to improve this tip deflection problem. A trolley with three axles (six whls.) would be an improvement too; in that more of the load would be further back on the first beam as the leading whl. crossed the slice gap. Are you using off-the-shelf trolleys or are you designing and building your own? Sometimes this gives you some latitude in what you can design around. Also, why not just a WF built-up shape for the hanger with the first (middle) vert. bolts closer to the beam joint. Wouldn’t this reduce the differential deflection btwn. the two beams and through the hanger?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources