Strength study of Leimet ABB+ 400 pile joints for precast reinforced concrete piles

Introduction. The technology of connecting precast reinforced concrete piles using pile joints is a promissing method in construction. According to some previous studies, the use of Leimet ABB+ pile joints provides for a significant reduction in material and labor intensity, as well as the time required for connecting the piles under sufficiently high strength and durability. Currently, the application of this technology is limited due to the insufficient knowledge of mechanical characteristics of pin connections. This article presents the results of strength tests of Leimet ABB+ pile joints for recast reinforced concrete piles.Aim. Experimental testing of the strength parameters of Leimet ABB+ pile joints under compression, tensile, transverse shear, and bending.Methods and materials. Experiments were performed using test samples represented by two fragments of recast reinforced concrete piles of the 1.011.1-10 standard, which were joined by a 4-lock Leimet ABB+ 400 pile joint. Loading tests of the samples were carried out in accordance with the GOST 8829-2018.Results. The qualitative and quantitative destruction parameters of the test samples were obtained. The destruction of all the test samples occurred along the concrete body of piles with no signs of destruction of the metal pin connection. In addition, no signs of concrete indents in the area of the pin connection were observed.Conclusions. Leimet ABB+ 400 pile joints were concluded to be of the uniform strength to the concrete pile body under the considered conditions. The test results of the pile joint strength are applicable when developing design projects.