THE FITTING POSITIONING METHOD WITH CREEP COMPENSATION IN LARGE CONCRETE COMPONENT MACHINING

Abstract:

The blank model of large-scale concrete component was established by measuring characteristic points outside the machining line, and then through Age-Adjusted effective modulus method, the concrete creep was calculated. Based on fitting algorithm of least-squares estimation in target location, the position fitting algorithm for creep compensation was given to obtain the accurate blank model for machining. When machining, just a few characteristic points are needed to match with component blank model based on creep compensation algorithm, and then the machining model can be built. The machining results about a prestressed concrete track girder show that the fitting precision calculated by position fitting algorithm is very close to that by remeasuring all characteristic points of machining line.