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Inner Triplet Supports

Inner Triplet Supports. Sonia Bartolomé Jiménez (TS/IC). Inner Triplets Supports: overview. Motorized jacks: polyurethane type (not able to take axial or radial forces) No specification about forces to be taken by the supports: assumed to be taken by tie-rods

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Inner Triplet Supports

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  1. Inner Triplet Supports Sonia Bartolomé Jiménez (TS/IC) Inner Triplet Review 24-25 April 2007

  2. Inner Triplets Supports: overview • Motorized jacks: polyurethane type (not able to take axial or radial forces) • No specification about forces to be taken by the supports: assumed to be taken by tie-rods • 2004: Decision to use the PMPS and central jacks for the Inner Triplets • Planning reasons • Study made by CAT (India) about the performance of the PMPS jacks for use in Inner Triplets : • Evaluation of the forces in the interconnections during alignment (13KN axial and 6KN radial)  Install an external stiffener for radial jack and limited modifications • 2005: Decision to not install the external stiffener after analysis of measurements in building 181 Inner Triplet Review 24-25 April 2007

  3. Inner Triplets Supports: fixation to the ground • Different beam height (950mm and 1050mm)  150mm extra shims at points 1, 2 and 8 • Rails required for the installation in points 1, 2R, 5, 8R Inner Triplet Review 24-25 April 2007

  4. Inner Triplets Supports: fixation to the ground • Different tunnel ground conditions: Point 1: Two holes of ~400mm diameter to fix the supports to the concrete underneath Point 2 (RB24): platform made of concrete blocks and reinforced concrete slabs to continue the tunnel slope Point 8 (RB86): reinforced concrete beam Inner Triplet Review 24-25 April 2007

  5. Inner Triplets Supports: maximum loading • Point 1 (critical point): • Pillar design axial load = 40KN / Vertical load = 100KN • Maximum axial load on the anchoring system = 40KN 600mm 280 Inner Triplet Review 24-25 April 2007

  6. Experimental measurement of rigidity of support system at point 1 for 40KN axial load: • 0.4mm at bottom position (#01) • 0.8m at intermediate position (#02) • 1.7mm at high position (#03) Inner Triplet Review 24-25 April 2007

  7. Inner Triplets Supports: maximum loading • Standard PMPS jack stiffness as specified and experimentally verified: Load = 64KN  Deflection (at head jack) = 1mm • Interface between cryomagnet and jack: angular contact spherical plain bearing Test with SSS arc cryomagnet (weight = 8T): under 100KN load applied axially on the center of the cryostat, no displacement observed Note: the PMPS jack could work as a free jack Inner Triplet Review 24-25 April 2007

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