Abstract
The article deals with the analysis of publications on the arrangement of barrette foundations. It indicates that the bearing capacity of a barrette is determined mainly by the resistance behind its lateral surface, and if it is larger, maybe, it will increase the bearing capacity of the barrette. The use of barrettes with a cross-sectional shape is more relevant than rectangular (square) one. Nowadays, rectangular (square), X-shaped, T-shaped, L-shaped, H-shaped, Y-shaped and C-shaped barrettes can be used in construction. The geometric dimensions of the barrettes depend on the size of a grab unit or a milling unit. A theoretical study of the parameters of the most common types of earthmoving machines, namely a hydraulic grab and a hydromill, was carried out. The technical characteristics of hydraulic grabbers were analyzed: KHD series (CASAGRANDE S.P.A.), GB series (BAUER Maschinen GmbH), HSG series (LIEBHERR Maschinen GmbH), GH series (SOILMEC S. P.A.) and technical characteristics of hydromills: FD series (CASAGRANDE S.P.A.), BC series (BAUER Maschinen GmbH), LSC series (LIEBHERR Maschinen GmbH), SH series (SOILMEC S.P.A.). The intervals of variations were determined in the geometric dimensions of a single gripper, which is arranged with the help of a grab unit and milling unit. It allowed to determine the possible variations in the geometric dimensions of rectangular (square), X-shaped, T-shaped, L-shaped, H-shaped, Y-shaped, and C-shaped barrettes with cross-sectional dimensions. According to the obtained results, the width of a separate linear element of the barrette can vary from 420 to 1800 mm during the use of a grab unit and from 64 to 2000 mm during the use of a milling unit. The length of a single line element of barrette can vary from 2200 mm to 4200 mm during the use of a grab unit and from 2200 mm to 3200 mm during the use of a milling unit. The obtained results will allow to optimize the design process of barrette foundations and avoid additional specification of their dimensions at the installation stage.
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