| 摘要 |
FIELD: construction industry. ^ SUBSTANCE: method of installing tubular pile in permanently frozen earth involves rotation of pile and its simultaneous vertical movement under influence of pressing axial load applied to the pile. At that speed of vertical pile movement Vm, value of pressing axial load Pt and angular speed of pile rotation omega are controlled using a nomogram built in logarithmic coordinate system wherein along x-axis there marked are magnitudes of the value (ath/deltath) that comprises the ratio of thermal conductivity of thawed earth ath to thickness of thawed earth seam under pile edge deltath, and along y-axis there marked are values of speed of vertical pile movement Vm. Nomogram consists of two families of Vm-vs-(ath/deltath) curves based on calculations of thermal, mechanical and hydrodynamic processes when installing the pile. The above nomogram provides the possibility of choosing the speed of vertical pile movement Vm, depending on pile size and specific earth properties, when Pt and omega are available, as well as the possibility of choosing pressing axial load Pt and angular speed of pile rotation omega when Vm and ath, deltath are available. ^ EFFECT: improving the accuracy of parametrisation of pile installation mode. ^ 3 cl, 2 dwg |
