APPARATUS FOR MEASURING TRANSITORY DEVIATION AND PERMANENT DEFORMATION OF DIFFERENT LAYERS IN A PAVEMENT STRUCTURE.

摘要

A SYSTEM 10 FOR MEASURING THE DEFLEXION AND / OR DEFORMATION OF A LAYER IN A UNDER LOAD PAVEMENT STRUCTURE IS DESCRIBED AND CLAIMED. THE SYSTEM INCLUDES AT LEAST ONE DEVICE 11 WHICH INCLUDES ELECTRIC COILS 17 SENSITIVE TO RELATIVE MOVEMENT BETWEEN THEM AND AN L8 BODY ANCHORED SEPARATELY OF FERROMAGNETIC MATERIAL. DEVICE 11 COMPRISES TWO DISCS 19, 22, LONGITUDINALLY SPACED, RELATIVELY MOVABLE, AND A BODY OF ELASTIC MATERIAL, EXPANDABLE TRANSVERSALLY BETWEEN THE DISCS. A NUT 25 SERVES TO PUSH DISCS L9, 22 ONE TO THE OTHER, SO THAT THE 2L BODY IS DILATED TRANSVERSELY TO SECURE THE DEVICE TO A DEFAULT DEPTH AGAINST A WALL IN A TEST HOLE.