Method for in situ tensile strength testing of wall structure

摘要

The in situ test of wall resistance to cross-sectional stretching is characterised by the removal of the levels of support strands (2) and vertical strands (2') around the wall element (1) over its entire length (1) and at the depth b corresponding to its width (1),and below the wall element (1) in its centre, a crack is made by removing the horizontal support coil (2) at the depth b and the width c from 40 to 60 mm and settling at the bottom of the resulting gap,the horizontal part of the profile (3) curved in the form of a letter "Z" made of a plate of width c, and above the profile (3) is mounted on the wall with an anchor (5) steel angle (4),with a profile (3) and a steel angle (4) in horizontal parts having holes in which a concentration screw (6) is mounted,with the dynamometer wrench raised, a tension is applied to the concentration screw (6) giving the force P in the wrench, causing the wall element (1) to be separated simultaneously from the lower support coil by a width b and a length equal to 1-c, and the resistance of the wall to stretch across the support coils is determined according to: Model: ft = Pn/b(l-c)',where b- the width of the wall element, l- the length of the wall element, c- the width of the crack formed in the support coil after being removed under the wall element, and Pn is the maximum P-force value followed b y a drop of voltage on the dynamometer key.