Abstract
Precast concrete tunnel-lining segments have to meet the moulds that cast them within tenths of a millimetre: the radial and circumferential joints must sit in full plane contact to carry the ring loads, linear dimensions must hold to avoid stepping and lipping, and the angles between contact faces must be right or the ring bird-mouths and loads concentrate. This presentation sets out VMT's photogrammetric and laser-based measurement of moulds and segments as part of quality management on tunnel-boring projects – among them the 14.2 m Elbe tunnel in Germany and the M30 motorway in Madrid – and the documentary evidence that only certified segments went into the ring.
Also published as CMSJ-02-1-02, The Journal of the CMSC, Volume 2, Number 1 (Spring 2007).
Cite this paper
Nod Clarke-Hackston. VMT GmbH. Presented at the Coordinate Metrology Systems Conference 2006, Orlando, Florida, July 17-21, 2006. Coordinate Metrology Society, reference CMS-2006-001.