lhc irq tie bar redesign using sleeves – preliminary
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
LHC IRQ Tie Bar Redesign Using Sleeves – Preliminary
T. Nicol
May 25, 2007
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Current tie bar installation
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Preliminary analysis
Assumed vacuum load: 20,000 lb total or 5,000 lb per rod (89,000 N)
Maximum distance between vacuum vessel ears: 81” (2050 mm)
Assume pinned ends
Assume S.F. of 4
Pcr = 2EI/l2 = 20,000 lb
For stainless steel the minimum value for I = 0.475 in4
Need ID = 1.25” to be compatible with current geometry
Solving for OD yields OD = 1.86” so use 2”
Actual I = 0.66 in4 so S.F. ~ 5.6
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Attachment to existing ear
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Attachment to sliding sleeve
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Attachment to existing ear
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Attachment to existing ear
At the magnet ears, the tie bar attaches with a 30 mm bolt. The bronze to stainless interface slides during pressure loading.
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Attachment to sliding sleeve
Each tie bar joins at the sliding sleeve ear. This is where each is adjusted for length, preloaded slightly, then locked in position.
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly of two tie rods at each ear location
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly of two tie rods at each ear location
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical tie rod assembly
Threaded insert – 30 mm thread ID, 42 mm thread OD
Jam nut
Tie rod sleeve – 2” OD, 1.25” ID
Insert – 30 mm thread ID, 42 mm smooth OD
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Tie rod assembly using sleeves – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly – v2
Outer nut omitted to prevent excessive load in the event of a cryogen spill inside the vacuum vessel
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly – v2
Nut to tighten sleeve against intermediate ear
Nut to tighten assembly against vacuum vessel ear
Spherical washers
2” OD, 1.25” ID sleeve
Tie rod
Tie rod, nuts, and spherical washers are the same as those in the current system
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX tie rod assembly using sleeves – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX typical assembly – v2
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q1 to Q2 tie rod assembly
MB-390925(1162 mm sleeve)
MB-390923(420 mm sleeve)
30 mm hex nuts (2)
30 mm jam nut (1)
Spherical washers (2 pairs)
Typical end detail
30 mm tie rod
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q2 to Q3 tie rod assembly
MB-390925(1162 mm sleeve)
MB-390924(620 mm sleeve)
30 mm hex nuts (2)
30 mm jam nut (1)
Spherical washers (2 pairs)
Typical end detail
30 mm tie rod
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brookhaven - fermilab - berkeleyUS LHC ACCELERATOR PROJECT
Q3 to DFBX tie rod assemblyMB-390926(682 mm sleeve)
30 mm hex nuts (2)
30 mm jam nut (1)
Spherical washers (2 pairs)
Typical end detail
30 mm tie rod
Stiffener plates (2)
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