Experience in the prevention of frost heave of pile foundations of transmission towers under northern conditions

Experience in the protection of pole foundations of transmission line objects from frost heave on the north of the Tyumen Region with the help of local cryosystems is described. A method for controlling the main factor determining the stability and reliability of operation of pole foundations of structures under unfavorable natural and climatic conditions is considered. Steady optimum temperature conditions of foundation soils are maintained for the entire period of existence of the object. A system for on-line control of the temperature conditions of soils of pile foundations of transmission towers and substation equipment and for their protection from frost heave with the help of seasonally functioning cooling devices (SCD) and thermal stabilizers (TS) is developed. Recommendations are given on effective use of the developed method. Data on commissioning of presented. The works were performed in cooperation with the department of cryology of Moscow State University and VNIIgaz. © 2004 Plenum Publishing Corporation.