Selection of Foundation Types for Mechanized Construction of 220 kV Overhead Transmission Lines in Mountainous Areas Suitable for Fujian Province

Abstract

The construction of overhead transmission lines in mountainous areas poses a significant challenge when it comes to foundation construction. The type of foundation selected in these areas has a direct impact on equipment selection and access road planning. Fujian Province, located on the southeastern coast of China, is predominantly hilly and mountainous. Therefore, selecting an appropriate foundation for overhead transmission lines is crucial for successful mechanized construction of transmission lines in this region. In this study, we aimed to enhance the economy of mechanized construction of the foundation of the 220 kV overhead transmission lines in Fujian Province. We analyzed the typical geological conditions and foundation reactions in the area and compared the construction costs of mechanical pile foundations, mechanical digging foundations, and rock anchor foundations. The results show that the mechanical pile foundation requires the least amount of concrete when the foundation reaction of the 220 kV suspension tower is less than 1700 kN and the foundation reaction of the 220 kV tension tower is less than 1300 kN. Additionally, the quantity of the rock anchor foundation is less than that of the digging foundation. In terms of cost, the rock anchor foundation is the most economical, followed by the mechanical pile foundation and then the digging foundation.

Experimental Study on the Bearing Behavior and Failure Model of Digging Hold Foundation in Rock Ground

“…Ning et al [23] showed that red clay has little effect on the mechanical behaviors of rock-similar materials, and the proportion of clay in the aggregate is chosen to be 10%. Equation (1) shows that the four factors can quantitatively describe the mass compositions of rock-similar material. The values of the four factors are selected, as shown in Table 1, using the orthogonal design method.…”

“…With the rapid development of China's infrastructure, more and more transmission lines are being built in mountainous and high mountain areas, where the tower foundation plays an important role in the construction of transmission lines due to limited construction space and large-scale construction equipment, such as the anchor foundation [1], conical shell foundations [2]. The digging hold foundations are quite popular for special geological conditions and harsh construction environments due to their high bearing capacity and easy construction, which has been widely applied in mountainous and high mountain areas.…”