STRENGTH OF ANCHORING OF BLOCKED SPIRAL ANCHOR LINKS IN MASONRY

Abstract

. The results of experimental studies of the tensile load resistance of the anchor fastening of Sure Twist stainless steel spiral anchors, established by driving into the body of masonry products made of aerated concrete, expanded clay concrete, dense silicate concrete, porous ceramic, are presented. Repair spiral-shaped bonds are used to connect the cladding with the inner layer when reinforcing and repairing multilayer external walls, when repairing brickwork in the crack formation zone, restoring metal bonds lost due to corrosion, and also arranging vertical expansion joints in the building cladding. The method of installing spiral ties by driving masonry products into the body significantly simplifies and cheapens repair work. As a result of the studies, the dependences “load-displacement of the anchor connection” were established, on the basis of which the characteristic and calculated values ​​of the pulling load and the adhesion strength of the bonds with masonry products manufactured in the Republic of Belarus were obtained. The characteristic values ​​of the pulling load and the adhesion strength of bonds with masonry products were determined in accordance with the criteria established in the standard EN 846-6 and FCS – 44416204-09. When determining the calculated values ​​of the tensile load and the adhesion strength of the bonds, the values ​​of the characteristics of the characteristics of the material properties g_M, according to TKP 45-5.03-308, depending on the class of work performance control, were assumed to be 2.0-2.5, and the value of the reliability coefficient for the material according to the breaking load m, according to the FCS – 44416204-09 equal to 3,0.