Composite slanted column expansion foundation structure applied to transmission lines in permafrost regions

Abstract

The invention discloses a composite inclined column expansion foundation structure applied to a power transmission line in a permafrost region. The composite inclined column expansion foundation structure comprises four reinforced concrete inclined columns which are arranged according to a gradient inclination angle of a tower and upper part structure, wherein the reinforced concrete inclined columns stretch to be below an upper limit of permafrost; a horizontal reinforced concrete bottom plate is laid at the bottom of each reinforced concrete inclined column; the body of each reinforced concrete inclined column is wrapped with a glass fibre reinforced plastic sleeve; a space among the four reinforced concrete inclined columns is filled with coarse-particle soil; the filling depth of the coarse-particle soil is from the upper limit of permafrost to a natural surface; and a rubble layer is laid on the coarse-particle soil. According to the invention, the artificial upper limit of permafrost is increased, a horizontal action force transferred to the foundation from an upper tower is reduced, the stability of a tower foundation and the bearing capacity of a ground foundation are enhanced, and the up-pull possibility of the tower foundation, and the freezing damages of a project are reduced.

Description

[0001] 【Technical field】 [0002] The invention relates to an expanded foundation of slanted columns in permafrost regions, in particular to a composite slanted column expanded foundation structure applied to power transmission lines in permafrost regions. [0003] 【Background technique】 [0004] The foundation selection of transmission lines in permafrost regions is severely restricted by various conditions, especially environmental factors and geological conditions. The inclined column extended foundation is a foundation type that can effectively reduce the horizontal force of the tower legs. In ordinary soil areas, for towers with a large foundation force, the amount of concrete and steel reinforcement materials after the inclined column extended foundation is lower than that of the straight column extended foundation About 10% to 20% lower. However, in permafrost areas, the frost heaving force generated by the seasonally frozen layer makes the slanted column body bear extr...

AI Technical Summary

Problems solved by technology

However, in permafrost areas, the frost heaving force generated by the seasonally frozen layer makes the slanted column body bear extra freezing pull and bending moment than the straight column body, especially in areas with higher frost heave level, the slanted column body is prone to Frost heave deformation damage

In addition, in the permafrost area, when the foundation construction and replacement of the inclined column expansion, it is necessary to excavate below the upper limit of the permafrost, disturbing the thermal balance of the permafrost layer may cause foundation thawing and settlement, affecting the stability of the tower foundation and the line Safety

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