Crane Beams and Rails
Crane Beams and Rails
(OP)
How do you gentlemen/ladies accommodate thermal expansion with crane beams and rails for exterior cranes. Themal difference may be +30C to -40C.
Dik
Dik
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RE: Crane Beams and Rails
"Accommodating" thermal movement depends on where the piece of steel is fixed, how many places it is fixed at, where the expansion "wants" to go, and the amount of relative expansion between the rail (in this case) and some other (assumed non-mobile!) object that is not expanding.
If a long rail is in mid-air with long vertical supports, there is no relative motion problem: everything expands and the vertical at each end go (slightly) out of vertical. If each each vertical is slightly canted inward in cold weather, then the end verticals move more towards "straight" up and down as the assembly heats up.
RE: Crane Beams and Rails
RE: Crane Beams and Rails
RE: Crane Beams and Rails
What is normally done is to provide the longitudinal bracing near the centre of the run, and the two ends move. Requires some flexibility in the transverse bracing.
RE: Crane Beams and Rails
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RE: Crane Beams and Rails
Second - I would place your X-braces - or whatever kind of brace you use - near the center of the rail system to allow the outer reaches of the rail to expand and contract without restraint.
The worst thing you can do is design several spaced braces along the length that will fight each other as the temperature changes....or braces at each end.
RE: Crane Beams and Rails
Dik
RE: Crane Beams and Rails
RE: Crane Beams and Rails
Dik
RE: Crane Beams and Rails
RE: Crane Beams and Rails
Dik
RE: Crane Beams and Rails
If you braced at intervals along the run, it would force the thermal movements into the joints mentioned.