SENSOR probe strain gauge for strain measurement ROCK MASS

摘要

The sensor probe is designed for measuring the deformation of the rock mass. It contains sensitive strain plate element with strain gauges, anchoring areas and cable. To allow proper installation in a borehole formed in the thickness of the rock mass and improve the reliability of measurement of deformations, the plate strain sensitive element is hardwired into the mortgage node configured as a parallelepipedal dimensions strain sensitive element and laying node satisfy the relations:; 0,3≤l / L≤0,9,; 0,2 w / W≤0,9,; where indicated:; l - length of the strain sensitive element, mm; L - laying unit length mm, w - strain sensitive element width, mm; W - the width of the laying assembly mm, base assembly is made of a composite material comprising:; A0 brand cement 25-30%; Quartz sand fraction 0,315-0,630 mm, 56-61%; sodium waterglass, 1%; remainder water,; wherein at node mortgage applied protective layer - sodium water glass with an inert filler.; 1 point patent claims, ill.1.