Inner Triplet Supports Sonia Bartolom Jimnez TSIC Inner

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

Inner Triplets Supports: overview Motorized jacks: polyurethane type (not able to take axial or radial forces) l No specification about forces to be taken by the supports: assumed to be taken by tie-rods l 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 (13 KN axial and 6 KN radial) Install an external stiffener for radial jack and limited modifications l 2005: Decision to not install the external stiffener after analysis of measurements in building 181 l Inner Triplet Review 24 -25 April 2007

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

Inner Triplets Supports: fixation to the ground – Different tunnel ground conditions: Point 1: Two holes of ~400 mm diameter to fix the supports to the concrete underneath Point 2 (RB 24): platform made of concrete blocks and reinforced concrete slabs to continue the tunnel slope Point 8 (RB 86): reinforced concrete beam Inner Triplet Review 24 -25 April 2007

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

l Experimental measurement of rigidity of support system at point 1 for 40 KN axial load: • 0. 4 mm at bottom position (#01) • 0. 8 m at intermediate position (#02) • 1. 7 mm at high position (#03) Inner Triplet Review 24 -25 April 2007

Inner Triplets Supports: maximum loading l Standard PMPS jack stiffness as specified and experimentally verified: Load = 64 KN Deflection (at head jack) = 1 mm l Interface between cryomagnet and jack: angular contact spherical plain bearing Test with SSS arc cryomagnet (weight = 8 T): under 100 KN 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